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annotate src/SbpOperators/readoperator.jl @ 860:568058183791 operator_storage_array_of_table

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Rename argument for `read_stencil_set`: `fn` -> `filename`
author Jonatan Werpers <jonatan@werpers.com>
date Wed, 19 Jan 2022 07:17:53 +0100
parents 0ed9ac097200
children 06c510d40ebb 7bf3121c6864
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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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13 """
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14 read_stencil_set(filename; filters)
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15
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16 Picks out a stencil set from a TOML file based on some key-value
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17 filters. If more than one set matches the filters an error is raised. The
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18 returned stencil set contains parsed TOML intended for functions like
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19 `parse_scalar` and `parse_stencil`.
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20
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21 The stencil set is not parsed beyond the inital TOML parse. To get usable
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22 stencils use the `parse_stencil` functions on the fields of the stencil set.
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23
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24 The reason for this is that since stencil sets are intended to be very
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25 general, and currently do not include any way to specify how to parse a given
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26 section, the exact parsing is left to the user.
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27
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28 For more information see [Operator file format](@ref) in the documentation.
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29
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30 See also [`sbp_operators_path`](@ref), [`get_stencil_set`](@ref), [`parse_stencil`](@ref), [`parse_scalar`](@ref), [`parse_tuple`](@ref),.
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31 """
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32 read_stencil_set(filename; filters...) = get_stencil_set(TOML.parsefile(filename); filters...)
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33
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34 """
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35 get_stencil_set(parsed_toml; filters...)
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36
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37 Picks out a stencil set from an already parsed TOML based on some key-value
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38 filters.
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39
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40 See also [`read_stencil_set`](@ref).
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41 """
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42 function get_stencil_set(parsed_toml; filters...)
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43 matches = findall(parsed_toml["stencil_set"]) do set
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44 for (key, val) ∈ filters
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45 if set[string(key)] != val
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46 return false
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47 end
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48 end
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49
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50 return true
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51 end
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52
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53 if length(matches) != 1
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54 throw(ArgumentError("filters must pick out a single stencil set"))
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55 end
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56
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57 i = matches[1]
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58 return parsed_toml["stencil_set"][i]
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59 end
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60
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61 """
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62 parse_stencil(parsed_toml)
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63
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64 Accepts parsed TOML and reads it as a stencil.
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65
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66 See also [`read_stencil_set`](@ref), [`parse_scalar`](@ref), [`parse_tuple`](@ref).
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67 """
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68 function parse_stencil(parsed_toml)
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69 check_stencil_toml(parsed_toml)
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70
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71 if parsed_toml isa Array
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72 weights = parse_rational.(parsed_toml)
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73 return CenteredStencil(weights...)
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74 end
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75
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76 weights = parse_rational.(parsed_toml["s"])
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77 return Stencil(weights..., center = parsed_toml["c"])
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78 end
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79
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80 """
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81 parse_stencil(T, parsed_toml)
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82
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83 Parses the input as a stencil with element type `T`.
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84 """
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85 parse_stencil(T, parsed_toml) = Stencil{T}(parse_stencil(parsed_toml))
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86
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87 function check_stencil_toml(parsed_toml)
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88 if !(parsed_toml isa Dict || parsed_toml isa Vector{String})
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89 throw(ArgumentError("the TOML for a stencil must be a vector of strings or a table."))
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90 end
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91
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92 if parsed_toml isa Vector{String}
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93 return
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94 end
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95
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96 if !(haskey(parsed_toml, "s") && haskey(parsed_toml, "c"))
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97 throw(ArgumentError("the table form of a stencil must have fields `s` and `c`."))
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98 end
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99
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100 if !(parsed_toml["s"] isa Vector{String})
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101 throw(ArgumentError("a stencil must be specified as a vector of strings."))
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102 end
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103
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104 if !(parsed_toml["c"] isa Int)
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105 throw(ArgumentError("the center of a stencil must be specified as an integer."))
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106 end
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107 end
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108
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109 """
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110 parse_scalar(parsed_toml)
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111
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112 Parse a scalar, represented as a string or a number in the TOML, and return it as a `Rational`
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113
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114 See also [`read_stencil_set`](@ref), [`parse_stencil`](@ref) [`parse_tuple`](@ref).
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115 """
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116 function parse_scalar(parsed_toml)
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117 try
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118 return parse_rational(parsed_toml)
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119 catch e
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120 throw(ArgumentError("must be a number or a string representing a number."))
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121 end
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122 end
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123
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124 """
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125 parse_tuple(parsed_toml)
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126
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127 Parse an array as a tuple of scalars.
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128
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129 See also [`read_stencil_set`](@ref), [`parse_stencil`](@ref), [`parse_scalar`](@ref).
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130 """
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131 function parse_tuple(parsed_toml)
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132 if !(parsed_toml isa Array)
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133 throw(ArgumentError("argument must be an array"))
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134 end
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135 return Tuple(parse_scalar.(parsed_toml))
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136 end
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137
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139 """
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140 parse_rational(parsed_toml)
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141
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142 Parse a string or a number as a rational.
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143 """
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144 function parse_rational(parsed_toml)
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145 if parsed_toml isa String
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146 expr = Meta.parse(replace(parsed_toml, "/"=>"//"))
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147 return eval(:(Rational($expr)))
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148 else
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149 return Rational(parsed_toml)
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150 end
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151 end
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152
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153 """
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154 sbp_operators_path()
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155
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156 Calculate the path for the operators folder with included stencil sets.
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157
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158 See also [`read_stencil_set`](@ref)
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159 """
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160 sbp_operators_path() = (@__DIR__) * "/operators/"