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annotate src/SbpOperators/readoperator.jl @ 805:3881386f25e6 operator_storage_array_of_table

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Add some todos
author Jonatan Werpers <jonatan@werpers.com>
date Wed, 15 Sep 2021 21:39:47 +0200
parents 98e0e0f3c5a8
children 219c9661e700
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1 using TOML
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2
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3 export read_stencil_set
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4 export get_stencil_set
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5
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6 export parse_stencil
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7 export parse_rational
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8
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9 export sbp_operators_path
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10
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11 # The read_stencil_set and get_stencil_set functions return the freshly parsed
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12 # toml. The generic code in these functions can't be expected to know anyhting
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13 # about how to read different stencil sets as they may contain many different
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14 # kinds of stencils. We should how ever add read_ and get_ functions for all
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15 # the types of stencils we know about.
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16 #
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17 # After getting a stencil set the user can use parse functions to parse what
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18 # they want from the TOML dict. I.e no more "paths".
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19 # Functions needed:
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20 # * parse stencil
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21 # * parse rational
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22 #
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23 # maybe there is a better name than parse?
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24 # Would be nice to be able to control the type in the stencil
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25
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26 # TODO: Control type for the stencil
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27 # TODO: Think about naming and terminology around freshly parsed TOML.
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28 # Vidar: What about get_stencil instead of parse_stencil for an already parsed
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29 # toml. It matches get_stencil_set.
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30
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31 # TODO: Docs for readoperator.jl
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32 # Parsing as rationals is intentional, allows preserving exactness, which can be lowered using converts or promotions later.
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33 # TODO: readoperator.jl file name?
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34 # TODO: Remove references to toml for dict-input arguments
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35
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36 """
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37 read_stencil_set(fn; filters)
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38
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39 Picks out a stencil set from the given toml file based on some filters.
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40 If more than one set matches the filters an error is raised.
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41
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42 The stencil set is not parsed beyond the inital toml parse. To get usable
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43 stencils use the `parse_stencil` functions on the fields of the stencil set.
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44 """
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45 read_stencil_set(fn; filters...) = get_stencil_set(TOML.parsefile(fn); filters...)
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46
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47 """
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48 get_stencil_set(parsed_toml; filters...)
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49
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50 Same as `read_stencil_set` but works on already parsed TOML.
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51 """
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52 function get_stencil_set(parsed_toml; filters...)
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53 matches = findall(parsed_toml["stencil_set"]) do set
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54 for (key, val) ∈ filters
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55 if set[string(key)] != val
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56 return false
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57 end
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58 end
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59
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60 return true
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61 end
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62
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63 if length(matches) != 1
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64 throw(ArgumentError("filters must pick out a single stencil set"))
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65 end
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66
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67 i = matches[1]
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68 return parsed_toml["stencil_set"][i]
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69 end
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70
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71 """
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72 parse_stencil(toml)
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73
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74 Accepts parsed toml and reads it as a stencil
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75 """
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76 function parse_stencil(toml)
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77 check_stencil_toml(toml)
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78
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79 if toml isa Array
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80 weights = Float64.(parse_rational.(toml))
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81 return CenteredStencil(weights...)
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82 end
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83
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84 weights = Float64.(parse_rational.(toml["s"]))
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85 return Stencil(weights..., center = toml["c"])
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86 end
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87
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88 function check_stencil_toml(toml)
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89 if !(toml isa Dict || toml isa Vector{String})
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90 throw(ArgumentError("the TOML for a stencil must be a vector of strings or a table."))
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91 end
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92
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93 if toml isa Vector{String}
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94 return
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95 end
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96
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97 if !(haskey(toml, "s") && haskey(toml, "c"))
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98 throw(ArgumentError("the table form of a stencil must have fields `s` and `c`."))
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99 end
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100
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101 if !(toml["s"] isa Vector{String})
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102 throw(ArgumentError("a stencil must be specified as a vector of strings."))
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103 end
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104
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105 if !(toml["c"] isa Int)
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106 throw(ArgumentError("the center of a stencil must be specified as an integer."))
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107 end
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108 end
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109
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110 function parse_rational(str)
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111 expr = Meta.parse(replace(str, "/"=>"//"))
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112 return eval(:(Rational($expr)))
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113 end
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114
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115 sbp_operators_path() = (@__DIR__) * "/operators/"