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annotate src/SbpOperators/readoperator.jl @ 856:0ed9ac097200 operator_storage_array_of_table

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Review: Small clarification in docs for read_stencil_set
author Vidar Stiernström <vidar.stiernstrom@it.uu.se>
date Tue, 18 Jan 2022 22:24:40 +0100
parents 439a5e6c7175
children 568058183791
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594
cc86b920531a Change the readoperator function to use the .toml format
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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_scalar
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8 export parse_tuple
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9
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10 export sbp_operators_path
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11
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12
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13 #REVIEW: Reference fn in doc for read_stencil_set.
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14 # Is it the filename of the TOML?
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15 """
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16 read_stencil_set(fn; filters)
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17
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18 Picks out a stencil set from the given TOML file based on some key-value
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19 filters. If more than one set matches the filters an error is raised. The
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20 returned stencil set contains parsed TOML intended for functions like
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21 `parse_scalar` and `parse_stencil`.
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22
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23 The stencil set is not parsed beyond the inital TOML parse. To get usable
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24 stencils use the `parse_stencil` functions on the fields of the stencil set.
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25
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26 The reason for this is that since stencil sets are intended to be very
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27 general, and currently do not include any way to specify how to parse a given
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28 section, the exact parsing is left to the user.
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29
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30 For more information see [Operator file format](@ref) in the documentation.
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31
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32 See also [`sbp_operators_path`](@ref), [`get_stencil_set`](@ref), [`parse_stencil`](@ref), [`parse_scalar`](@ref), [`parse_tuple`](@ref),.
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33 """
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34 read_stencil_set(fn; filters...) = get_stencil_set(TOML.parsefile(fn); filters...)
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35
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36 """
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37 get_stencil_set(parsed_toml; filters...)
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38
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39 Picks out a stencil set from an already parsed TOML based on some key-value
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40 filters.
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41
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42 See also [`read_stencil_set`](@ref).
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43 """
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44 function get_stencil_set(parsed_toml; filters...)
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45 matches = findall(parsed_toml["stencil_set"]) do set
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46 for (key, val) ∈ filters
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47 if set[string(key)] != val
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48 return false
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49 end
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50 end
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51
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52 return true
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53 end
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54
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55 if length(matches) != 1
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56 throw(ArgumentError("filters must pick out a single stencil set"))
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57 end
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58
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59 i = matches[1]
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60 return parsed_toml["stencil_set"][i]
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61 end
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62
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63 """
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64 parse_stencil(parsed_toml)
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65
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66 Accepts parsed TOML and reads it as a stencil.
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67
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68 See also [`read_stencil_set`](@ref), [`parse_scalar`](@ref), [`parse_tuple`](@ref).
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69 """
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70 function parse_stencil(parsed_toml)
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71 check_stencil_toml(parsed_toml)
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72
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73 if parsed_toml isa Array
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74 weights = parse_rational.(parsed_toml)
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75 return CenteredStencil(weights...)
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76 end
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77
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78 weights = parse_rational.(parsed_toml["s"])
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79 return Stencil(weights..., center = parsed_toml["c"])
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80 end
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81
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82 """
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83 parse_stencil(T, parsed_toml)
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84
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85 Parses the input as a stencil with element type `T`.
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86 """
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87 parse_stencil(T, parsed_toml) = Stencil{T}(parse_stencil(parsed_toml))
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88
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89 function check_stencil_toml(parsed_toml)
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90 if !(parsed_toml isa Dict || parsed_toml isa Vector{String})
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91 throw(ArgumentError("the TOML for a stencil must be a vector of strings or a table."))
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92 end
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93
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94 if parsed_toml isa Vector{String}
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95 return
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96 end
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97
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98 if !(haskey(parsed_toml, "s") && haskey(parsed_toml, "c"))
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99 throw(ArgumentError("the table form of a stencil must have fields `s` and `c`."))
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100 end
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101
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102 if !(parsed_toml["s"] isa Vector{String})
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103 throw(ArgumentError("a stencil must be specified as a vector of strings."))
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104 end
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105
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106 if !(parsed_toml["c"] isa Int)
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107 throw(ArgumentError("the center of a stencil must be specified as an integer."))
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108 end
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109 end
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110
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111 """
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112 parse_scalar(parsed_toml)
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113
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114 Parse a scalar, represented as a string or a number in the TOML, and return it as a `Rational`
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115
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116 See also [`read_stencil_set`](@ref), [`parse_stencil`](@ref) [`parse_tuple`](@ref).
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117 """
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118 function parse_scalar(parsed_toml)
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119 try
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120 return parse_rational(parsed_toml)
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121 catch e
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122 throw(ArgumentError("must be a number or a string representing a number."))
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123 end
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124 end
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125
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126 """
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127 parse_tuple(parsed_toml)
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128
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129 Parse an array as a tuple of scalars.
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130
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131 See also [`read_stencil_set`](@ref), [`parse_stencil`](@ref), [`parse_scalar`](@ref).
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132 """
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133 function parse_tuple(parsed_toml)
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134 if !(parsed_toml isa Array)
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135 throw(ArgumentError("argument must be an array"))
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136 end
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137 return Tuple(parse_scalar.(parsed_toml))
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138 end
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139
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140
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141 """
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142 parse_rational(parsed_toml)
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143
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144 Parse a string or a number as a rational.
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145 """
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146 function parse_rational(parsed_toml)
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147 if parsed_toml isa String
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148 expr = Meta.parse(replace(parsed_toml, "/"=>"//"))
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149 return eval(:(Rational($expr)))
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150 else
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151 return Rational(parsed_toml)
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152 end
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153 end
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154
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155 """
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156 sbp_operators_path()
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157
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158 Calculate the path for the operators folder with included stencil sets.
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159
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160 See also [`read_stencil_set`](@ref)
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161 """
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162 sbp_operators_path() = (@__DIR__) * "/operators/"