wdown: katex/contrib/render-a11y-string.mjs annotate

annotate katex/contrib/render-a11y-string.mjs @ 8:4a25b534c81c javascript-experiment

Add v8 engine and include katex

author	Jonatan Werpers <jonatan@werpers.com>
date	Wed, 17 Jun 2020 21:43:52 +0200
parents
children

rev	line source
8 4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	1 import katex from '../katex.mjs';
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	2
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	3 /**
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	4 * renderA11yString returns a readable string.
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	5 *
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	6 * In some cases the string will have the proper semantic math
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	7 * meaning,:
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	8 * renderA11yString("\\frac{1}{2}"")
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	9 * -> "start fraction, 1, divided by, 2, end fraction"
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	10 *
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	11 * However, other cases do not:
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	12 * renderA11yString("f(x) = x^2")
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	13 * -> "f, left parenthesis, x, right parenthesis, equals, x, squared"
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	14 *
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	15 * The commas in the string aim to increase ease of understanding
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	16 * when read by a screenreader.
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	17 */
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	18 const stringMap = {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	19 "(": "left parenthesis",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	20 ")": "right parenthesis",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	21 "[": "open bracket",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	22 "]": "close bracket",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	23 "\\{": "left brace",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	24 "\\}": "right brace",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	25 "\\lvert": "open vertical bar",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	26 "\\rvert": "close vertical bar",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	27 "\|": "vertical bar",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	28 "\\uparrow": "up arrow",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	29 "\\Uparrow": "up arrow",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	30 "\\downarrow": "down arrow",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	31 "\\Downarrow": "down arrow",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	32 "\\updownarrow": "up down arrow",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	33 "\\leftarrow": "left arrow",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	34 "\\Leftarrow": "left arrow",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	35 "\\rightarrow": "right arrow",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	36 "\\Rightarrow": "right arrow",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	37 "\\langle": "open angle",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	38 "\\rangle": "close angle",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	39 "\\lfloor": "open floor",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	40 "\\rfloor": "close floor",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	41 "\\int": "integral",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	42 "\\intop": "integral",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	43 "\\lim": "limit",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	44 "\\ln": "natural log",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	45 "\\log": "log",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	46 "\\sin": "sine",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	47 "\\cos": "cosine",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	48 "\\tan": "tangent",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	49 "\\cot": "cotangent",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	50 "\\sum": "sum",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	51 "/": "slash",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	52 ",": "comma",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	53 ".": "point",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	54 "-": "negative",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	55 "+": "plus",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	56 "~": "tilde",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	57 ":": "colon",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	58 "?": "question mark",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	59 "'": "apostrophe",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	60 "\\%": "percent",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	61 " ": "space",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	62 "\\ ": "space",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	63 "\\$": "dollar sign",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	64 "\\angle": "angle",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	65 "\\degree": "degree",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	66 "\\circ": "circle",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	67 "\\vec": "vector",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	68 "\\triangle": "triangle",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	69 "\\pi": "pi",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	70 "\\prime": "prime",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	71 "\\infty": "infinity",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	72 "\\alpha": "alpha",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	73 "\\beta": "beta",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	74 "\\gamma": "gamma",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	75 "\\omega": "omega",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	76 "\\theta": "theta",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	77 "\\sigma": "sigma",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	78 "\\lambda": "lambda",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	79 "\\tau": "tau",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	80 "\\Delta": "delta",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	81 "\\delta": "delta",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	82 "\\mu": "mu",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	83 "\\rho": "rho",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	84 "\\nabla": "del",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	85 "\\ell": "ell",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	86 "\\ldots": "dots",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	87 // TODO: add entries for all accents
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	88 "\\hat": "hat",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	89 "\\acute": "acute"
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	90 };
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	91 const powerMap = {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	92 "prime": "prime",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	93 "degree": "degrees",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	94 "circle": "degrees",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	95 "2": "squared",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	96 "3": "cubed"
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	97 };
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	98 const openMap = {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	99 "\|": "open vertical bar",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	100 ".": ""
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	101 };
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	102 const closeMap = {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	103 "\|": "close vertical bar",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	104 ".": ""
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	105 };
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	106 const binMap = {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	107 "+": "plus",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	108 "-": "minus",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	109 "\\pm": "plus minus",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	110 "\\cdot": "dot",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	111 "*": "times",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	112 "/": "divided by",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	113 "\\times": "times",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	114 "\\div": "divided by",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	115 "\\circ": "circle",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	116 "\\bullet": "bullet"
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	117 };
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	118 const relMap = {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	119 "=": "equals",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	120 "\\approx": "approximately equals",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	121 "≠": "does not equal",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	122 "\\geq": "is greater than or equal to",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	123 "\\ge": "is greater than or equal to",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	124 "\\leq": "is less than or equal to",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	125 "\\le": "is less than or equal to",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	126 ">": "is greater than",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	127 "<": "is less than",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	128 "\\leftarrow": "left arrow",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	129 "\\Leftarrow": "left arrow",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	130 "\\rightarrow": "right arrow",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	131 "\\Rightarrow": "right arrow",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	132 ":": "colon"
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	133 };
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	134 const accentUnderMap = {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	135 "\\underleftarrow": "left arrow",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	136 "\\underrightarrow": "right arrow",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	137 "\\underleftrightarrow": "left-right arrow",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	138 "\\undergroup": "group",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	139 "\\underlinesegment": "line segment",
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	140 "\\utilde": "tilde"
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	141 };
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	142
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	143 const buildString = (str, type, a11yStrings) => {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	144 if (!str) {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	145 return;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	146 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	147
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	148 let ret;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	149
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	150 if (type === "open") {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	151 ret = str in openMap ? openMap[str] : stringMap[str] \|\| str;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	152 } else if (type === "close") {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	153 ret = str in closeMap ? closeMap[str] : stringMap[str] \|\| str;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	154 } else if (type === "bin") {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	155 ret = binMap[str] \|\| str;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	156 } else if (type === "rel") {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	157 ret = relMap[str] \|\| str;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	158 } else {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	159 ret = stringMap[str] \|\| str;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	160 } // If the text to add is a number and there is already a string
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	161 // in the list and the last string is a number then we should
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	162 // combine them into a single number
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	163
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	164
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	165 if (/^\d+$/.test(ret) && a11yStrings.length > 0 && // TODO(kevinb): check that the last item in a11yStrings is a string
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	166 // I think we might be able to drop the nested arrays, which would make
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	167 // this easier to type - $FlowFixMe
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	168 /^\d+$/.test(a11yStrings[a11yStrings.length - 1])) {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	169 a11yStrings[a11yStrings.length - 1] += ret;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	170 } else if (ret) {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	171 a11yStrings.push(ret);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	172 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	173 };
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	174
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	175 const buildRegion = (a11yStrings, callback) => {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	176 const regionStrings = [];
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	177 a11yStrings.push(regionStrings);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	178 callback(regionStrings);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	179 };
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	180
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	181 const handleObject = (tree, a11yStrings, atomType) => {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	182 // Everything else is assumed to be an object...
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	183 switch (tree.type) {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	184 case "accent":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	185 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	186 buildRegion(a11yStrings, a11yStrings => {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	187 buildA11yStrings(tree.base, a11yStrings, atomType);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	188 a11yStrings.push("with");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	189 buildString(tree.label, "normal", a11yStrings);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	190 a11yStrings.push("on top");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	191 });
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	192 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	193 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	194
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	195 case "accentUnder":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	196 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	197 buildRegion(a11yStrings, a11yStrings => {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	198 buildA11yStrings(tree.base, a11yStrings, atomType);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	199 a11yStrings.push("with");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	200 buildString(accentUnderMap[tree.label], "normal", a11yStrings);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	201 a11yStrings.push("underneath");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	202 });
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	203 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	204 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	205
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	206 case "accent-token":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	207 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	208 // Used internally by accent symbols.
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	209 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	210 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	211
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	212 case "atom":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	213 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	214 const text = tree.text;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	215
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	216 switch (tree.family) {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	217 case "bin":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	218 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	219 buildString(text, "bin", a11yStrings);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	220 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	221 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	222
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	223 case "close":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	224 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	225 buildString(text, "close", a11yStrings);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	226 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	227 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	228 // TODO(kevinb): figure out what should be done for inner
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	229
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	230 case "inner":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	231 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	232 buildString(tree.text, "inner", a11yStrings);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	233 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	234 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	235
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	236 case "open":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	237 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	238 buildString(text, "open", a11yStrings);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	239 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	240 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	241
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	242 case "punct":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	243 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	244 buildString(text, "punct", a11yStrings);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	245 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	246 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	247
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	248 case "rel":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	249 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	250 buildString(text, "rel", a11yStrings);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	251 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	252 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	253
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	254 default:
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	255 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	256 tree.family;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	257 throw new Error(`"${tree.family}" is not a valid atom type`);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	258 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	259 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	260
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	261 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	262 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	263
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	264 case "color":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	265 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	266 const color = tree.color.replace(/katex-/, "");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	267 buildRegion(a11yStrings, regionStrings => {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	268 regionStrings.push("start color " + color);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	269 buildA11yStrings(tree.body, regionStrings, atomType);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	270 regionStrings.push("end color " + color);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	271 });
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	272 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	273 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	274
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	275 case "color-token":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	276 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	277 // Used by \color, \colorbox, and \fcolorbox but not directly rendered.
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	278 // It's a leaf node and has no children so just break.
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	279 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	280 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	281
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	282 case "delimsizing":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	283 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	284 if (tree.delim && tree.delim !== ".") {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	285 buildString(tree.delim, "normal", a11yStrings);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	286 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	287
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	288 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	289 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	290
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	291 case "genfrac":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	292 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	293 buildRegion(a11yStrings, regionStrings => {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	294 // genfrac can have unbalanced delimiters
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	295 const leftDelim = tree.leftDelim,
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	296 rightDelim = tree.rightDelim; // NOTE: Not sure if this is a safe assumption
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	297 // hasBarLine true -> fraction, false -> binomial
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	298
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	299 if (tree.hasBarLine) {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	300 regionStrings.push("start fraction");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	301 leftDelim && buildString(leftDelim, "open", regionStrings);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	302 buildA11yStrings(tree.numer, regionStrings, atomType);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	303 regionStrings.push("divided by");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	304 buildA11yStrings(tree.denom, regionStrings, atomType);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	305 rightDelim && buildString(rightDelim, "close", regionStrings);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	306 regionStrings.push("end fraction");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	307 } else {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	308 regionStrings.push("start binomial");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	309 leftDelim && buildString(leftDelim, "open", regionStrings);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	310 buildA11yStrings(tree.numer, regionStrings, atomType);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	311 regionStrings.push("over");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	312 buildA11yStrings(tree.denom, regionStrings, atomType);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	313 rightDelim && buildString(rightDelim, "close", regionStrings);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	314 regionStrings.push("end binomial");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	315 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	316 });
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	317 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	318 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	319
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	320 case "kern":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	321 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	322 // No op: we don't attempt to present kerning information
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	323 // to the screen reader.
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	324 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	325 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	326
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	327 case "leftright":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	328 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	329 buildRegion(a11yStrings, regionStrings => {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	330 buildString(tree.left, "open", regionStrings);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	331 buildA11yStrings(tree.body, regionStrings, atomType);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	332 buildString(tree.right, "close", regionStrings);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	333 });
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	334 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	335 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	336
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	337 case "leftright-right":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	338 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	339 // TODO: double check that this is a no-op
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	340 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	341 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	342
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	343 case "lap":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	344 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	345 buildA11yStrings(tree.body, a11yStrings, atomType);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	346 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	347 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	348
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	349 case "mathord":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	350 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	351 buildString(tree.text, "normal", a11yStrings);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	352 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	353 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	354
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	355 case "op":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	356 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	357 const body = tree.body,
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	358 name = tree.name;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	359
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	360 if (body) {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	361 buildA11yStrings(body, a11yStrings, atomType);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	362 } else if (name) {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	363 buildString(name, "normal", a11yStrings);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	364 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	365
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	366 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	367 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	368
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	369 case "op-token":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	370 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	371 // Used internally by operator symbols.
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	372 buildString(tree.text, atomType, a11yStrings);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	373 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	374 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	375
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	376 case "ordgroup":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	377 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	378 buildA11yStrings(tree.body, a11yStrings, atomType);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	379 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	380 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	381
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	382 case "overline":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	383 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	384 buildRegion(a11yStrings, function (a11yStrings) {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	385 a11yStrings.push("start overline");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	386 buildA11yStrings(tree.body, a11yStrings, atomType);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	387 a11yStrings.push("end overline");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	388 });
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	389 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	390 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	391
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	392 case "phantom":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	393 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	394 a11yStrings.push("empty space");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	395 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	396 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	397
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	398 case "raisebox":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	399 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	400 buildA11yStrings(tree.body, a11yStrings, atomType);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	401 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	402 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	403
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	404 case "rule":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	405 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	406 a11yStrings.push("rectangle");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	407 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	408 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	409
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	410 case "sizing":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	411 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	412 buildA11yStrings(tree.body, a11yStrings, atomType);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	413 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	414 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	415
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	416 case "spacing":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	417 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	418 a11yStrings.push("space");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	419 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	420 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	421
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	422 case "styling":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	423 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	424 // We ignore the styling and just pass through the contents
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	425 buildA11yStrings(tree.body, a11yStrings, atomType);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	426 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	427 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	428
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	429 case "sqrt":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	430 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	431 buildRegion(a11yStrings, regionStrings => {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	432 const body = tree.body,
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	433 index = tree.index;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	434
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	435 if (index) {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	436 const indexString = flatten(buildA11yStrings(index, [], atomType)).join(",");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	437
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	438 if (indexString === "3") {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	439 regionStrings.push("cube root of");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	440 buildA11yStrings(body, regionStrings, atomType);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	441 regionStrings.push("end cube root");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	442 return;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	443 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	444
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	445 regionStrings.push("root");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	446 regionStrings.push("start index");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	447 buildA11yStrings(index, regionStrings, atomType);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	448 regionStrings.push("end index");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	449 return;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	450 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	451
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	452 regionStrings.push("square root of");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	453 buildA11yStrings(body, regionStrings, atomType);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	454 regionStrings.push("end square root");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	455 });
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	456 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	457 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	458
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	459 case "supsub":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	460 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	461 const base = tree.base,
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	462 sub = tree.sub,
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	463 sup = tree.sup;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	464 let isLog = false;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	465
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	466 if (base) {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	467 buildA11yStrings(base, a11yStrings, atomType);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	468 isLog = base.type === "op" && base.name === "\\log";
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	469 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	470
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	471 if (sub) {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	472 const regionName = isLog ? "base" : "subscript";
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	473 buildRegion(a11yStrings, function (regionStrings) {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	474 regionStrings.push(`start ${regionName}`);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	475 buildA11yStrings(sub, regionStrings, atomType);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	476 regionStrings.push(`end ${regionName}`);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	477 });
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	478 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	479
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	480 if (sup) {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	481 buildRegion(a11yStrings, function (regionStrings) {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	482 const supString = flatten(buildA11yStrings(sup, [], atomType)).join(",");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	483
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	484 if (supString in powerMap) {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	485 regionStrings.push(powerMap[supString]);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	486 return;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	487 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	488
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	489 regionStrings.push("start superscript");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	490 buildA11yStrings(sup, regionStrings, atomType);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	491 regionStrings.push("end superscript");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	492 });
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	493 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	494
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	495 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	496 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	497
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	498 case "text":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	499 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	500 // TODO: handle other fonts
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	501 if (tree.font === "\\textbf") {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	502 buildRegion(a11yStrings, function (regionStrings) {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	503 regionStrings.push("start bold text");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	504 buildA11yStrings(tree.body, regionStrings, atomType);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	505 regionStrings.push("end bold text");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	506 });
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	507 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	508 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	509
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	510 buildRegion(a11yStrings, function (regionStrings) {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	511 regionStrings.push("start text");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	512 buildA11yStrings(tree.body, regionStrings, atomType);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	513 regionStrings.push("end text");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	514 });
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	515 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	516 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	517
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	518 case "textord":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	519 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	520 buildString(tree.text, atomType, a11yStrings);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	521 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	522 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	523
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	524 case "smash":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	525 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	526 buildA11yStrings(tree.body, a11yStrings, atomType);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	527 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	528 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	529
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	530 case "enclose":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	531 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	532 // TODO: create a map for these.
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	533 // TODO: differentiate between a body with a single atom, e.g.
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	534 // "cancel a" instead of "start cancel, a, end cancel"
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	535 if (/cancel/.test(tree.label)) {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	536 buildRegion(a11yStrings, function (regionStrings) {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	537 regionStrings.push("start cancel");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	538 buildA11yStrings(tree.body, regionStrings, atomType);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	539 regionStrings.push("end cancel");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	540 });
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	541 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	542 } else if (/box/.test(tree.label)) {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	543 buildRegion(a11yStrings, function (regionStrings) {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	544 regionStrings.push("start box");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	545 buildA11yStrings(tree.body, regionStrings, atomType);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	546 regionStrings.push("end box");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	547 });
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	548 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	549 } else if (/sout/.test(tree.label)) {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	550 buildRegion(a11yStrings, function (regionStrings) {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	551 regionStrings.push("start strikeout");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	552 buildA11yStrings(tree.body, regionStrings, atomType);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	553 regionStrings.push("end strikeout");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	554 });
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	555 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	556 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	557
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	558 throw new Error(`KaTeX-a11y: enclose node with ${tree.label} not supported yet`);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	559 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	560
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	561 case "vphantom":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	562 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	563 throw new Error("KaTeX-a11y: vphantom not implemented yet");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	564 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	565
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	566 case "hphantom":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	567 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	568 throw new Error("KaTeX-a11y: hphantom not implemented yet");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	569 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	570
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	571 case "operatorname":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	572 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	573 buildA11yStrings(tree.body, a11yStrings, atomType);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	574 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	575 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	576
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	577 case "array":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	578 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	579 throw new Error("KaTeX-a11y: array not implemented yet");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	580 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	581
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	582 case "raw":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	583 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	584 throw new Error("KaTeX-a11y: raw not implemented yet");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	585 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	586
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	587 case "size":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	588 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	589 // Although there are nodes of type "size" in the parse tree, they have
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	590 // no semantic meaning and should be ignored.
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	591 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	592 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	593
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	594 case "url":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	595 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	596 throw new Error("KaTeX-a11y: url not implemented yet");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	597 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	598
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	599 case "tag":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	600 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	601 throw new Error("KaTeX-a11y: tag not implemented yet");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	602 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	603
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	604 case "verb":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	605 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	606 buildString(`start verbatim`, "normal", a11yStrings);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	607 buildString(tree.body, "normal", a11yStrings);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	608 buildString(`end verbatim`, "normal", a11yStrings);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	609 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	610 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	611
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	612 case "environment":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	613 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	614 throw new Error("KaTeX-a11y: environment not implemented yet");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	615 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	616
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	617 case "horizBrace":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	618 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	619 buildString(`start ${tree.label.slice(1)}`, "normal", a11yStrings);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	620 buildA11yStrings(tree.base, a11yStrings, atomType);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	621 buildString(`end ${tree.label.slice(1)}`, "normal", a11yStrings);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	622 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	623 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	624
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	625 case "infix":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	626 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	627 // All infix nodes are replace with other nodes.
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	628 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	629 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	630
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	631 case "includegraphics":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	632 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	633 throw new Error("KaTeX-a11y: includegraphics not implemented yet");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	634 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	635
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	636 case "font":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	637 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	638 // TODO: callout the start/end of specific fonts
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	639 // TODO: map \BBb{N} to "the naturals" or something like that
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	640 buildA11yStrings(tree.body, a11yStrings, atomType);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	641 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	642 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	643
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	644 case "href":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	645 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	646 throw new Error("KaTeX-a11y: href not implemented yet");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	647 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	648
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	649 case "cr":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	650 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	651 // This is used by environments.
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	652 throw new Error("KaTeX-a11y: cr not implemented yet");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	653 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	654
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	655 case "underline":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	656 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	657 buildRegion(a11yStrings, function (a11yStrings) {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	658 a11yStrings.push("start underline");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	659 buildA11yStrings(tree.body, a11yStrings, atomType);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	660 a11yStrings.push("end underline");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	661 });
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	662 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	663 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	664
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	665 case "xArrow":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	666 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	667 throw new Error("KaTeX-a11y: xArrow not implemented yet");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	668 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	669
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	670 case "mclass":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	671 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	672 // \neq and \ne are macros so we let "htmlmathml" render the mathmal
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	673 // side of things and extract the text from that.
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	674 const atomType = tree.mclass.slice(1); // $FlowFixMe: drop the leading "m" from the values in mclass
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	675
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	676 buildA11yStrings(tree.body, a11yStrings, atomType);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	677 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	678 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	679
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	680 case "mathchoice":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	681 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	682 // TODO: track which which style we're using, e.g. dispaly, text, etc.
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	683 // default to text style if even that may not be the correct style
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	684 buildA11yStrings(tree.text, a11yStrings, atomType);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	685 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	686 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	687
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	688 case "htmlmathml":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	689 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	690 buildA11yStrings(tree.mathml, a11yStrings, atomType);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	691 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	692 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	693
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	694 case "middle":
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	695 {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	696 buildString(tree.delim, atomType, a11yStrings);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	697 break;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	698 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	699
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	700 default:
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	701 tree.type;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	702 throw new Error("KaTeX a11y un-recognized type: " + tree.type);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	703 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	704 };
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	705
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	706 const buildA11yStrings = function buildA11yStrings(tree, a11yStrings, atomType) {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	707 if (a11yStrings === void 0) {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	708 a11yStrings = [];
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	709 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	710
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	711 if (tree instanceof Array) {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	712 for (let i = 0; i < tree.length; i++) {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	713 buildA11yStrings(tree[i], a11yStrings, atomType);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	714 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	715 } else {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	716 handleObject(tree, a11yStrings, atomType);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	717 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	718
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	719 return a11yStrings;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	720 };
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	721
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	722 const flatten = function flatten(array) {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	723 let result = [];
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	724 array.forEach(function (item) {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	725 if (item instanceof Array) {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	726 result = result.concat(flatten(item));
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	727 } else {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	728 result.push(item);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	729 }
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	730 });
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	731 return result;
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	732 };
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	733
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	734 const renderA11yString = function renderA11yString(text, settings) {
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	735 const tree = katex.__parse(text, settings);
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	736
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	737 const a11yStrings = buildA11yStrings(tree, [], "normal");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	738 return flatten(a11yStrings).join(", ");
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	739 };
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	740
4a25b534c81c Add v8 engine and include katex Jonatan Werpers <jonatan@werpers.com> parents: diff changeset	741 export default renderA11yString;