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annotate src/SbpOperators/readoperator.jl @ 1866:8236c3063fa1 feature/subpackage_simple_timesteppers

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author Jonatan Werpers <jonatan@werpers.com>
date Mon, 20 Jan 2025 23:08:03 +0100
parents fe8fe3f01162
children 439a5e6c7175
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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 """
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14 read_stencil_set(fn; filters)
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15
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16 Picks out a stencil set from the given 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(fn; filters...) = get_stencil_set(TOML.parsefile(fn); 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 Same as `read_stencil_set` but works on already parsed TOML.
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38
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39 See also [`read_stencil_set`](@ref).
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40 """
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41 function get_stencil_set(parsed_toml; filters...)
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42 matches = findall(parsed_toml["stencil_set"]) do set
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43 for (key, val) ∈ filters
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44 if set[string(key)] != val
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45 return false
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46 end
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47 end
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48
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49 return true
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50 end
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51
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52 if length(matches) != 1
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53 throw(ArgumentError("filters must pick out a single stencil set"))
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54 end
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55
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56 i = matches[1]
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57 return parsed_toml["stencil_set"][i]
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58 end
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59
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60 """
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61 parse_stencil(parsed_toml)
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62
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63 Accepts parsed toml and reads it as a stencil.
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64
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65 See also [`read_stencil_set`](@ref), [`parse_scalar`](@ref), [`parse_tuple`](@ref).
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66 """
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67 function parse_stencil(parsed_toml)
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68 check_stencil_toml(parsed_toml)
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69
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70 if parsed_toml isa Array
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71 weights = parse_rational.(parsed_toml)
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72 return CenteredStencil(weights...)
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73 end
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74
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75 weights = parse_rational.(parsed_toml["s"])
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76 return Stencil(weights..., center = parsed_toml["c"])
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77 end
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78
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79 """
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80 parse_stencil(T, parsed_toml)
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81
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82 Parses the input as a stencil with element type `T`.
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83 """
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84 parse_stencil(T, parsed_toml) = Stencil{T}(parse_stencil(parsed_toml))
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85
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86 function check_stencil_toml(parsed_toml)
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87 if !(parsed_toml isa Dict || parsed_toml isa Vector{String})
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88 throw(ArgumentError("the TOML for a stencil must be a vector of strings or a table."))
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89 end
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90
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91 if parsed_toml isa Vector{String}
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92 return
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93 end
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94
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95 if !(haskey(parsed_toml, "s") && haskey(parsed_toml, "c"))
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96 throw(ArgumentError("the table form of a stencil must have fields `s` and `c`."))
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97 end
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98
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99 if !(parsed_toml["s"] isa Vector{String})
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100 throw(ArgumentError("a stencil must be specified as a vector of strings."))
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101 end
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102
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103 if !(parsed_toml["c"] isa Int)
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104 throw(ArgumentError("the center of a stencil must be specified as an integer."))
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105 end
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106 end
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107
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108 """
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109 parse_scalar(parsed_toml)
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110
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111 Parse a scalar, represented as a string or a number in the TOML, and return it as a `Rational`
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112
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113 See also [`read_stencil_set`](@ref), [`parse_stencil`](@ref) [`parse_tuple`](@ref).
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114 """
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115 function parse_scalar(parsed_toml)
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116 try
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117 return parse_rational(parsed_toml)
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118 catch e
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119 throw(ArgumentError("must be a number or a string representing a number."))
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120 end
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121 end
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122
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123 """
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124 parse_tuple(parsed_toml)
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125
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126 Parse an array as a tuple of scalars.
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127
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128 See also [`read_stencil_set`](@ref), [`parse_stencil`](@ref), [`parse_scalar`](@ref).
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129 """
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130 function parse_tuple(parsed_toml)
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131 if !(parsed_toml isa Array)
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132 throw(ArgumentError("argument must be an array"))
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133 end
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134 return Tuple(parse_scalar.(parsed_toml))
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135 end
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136
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137
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138 """
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139 parse_rational(parsed_toml)
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140
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141 Parse a string or a number as a rational.
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142 """
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143 function parse_rational(parsed_toml)
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144 if parsed_toml isa String
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145 expr = Meta.parse(replace(parsed_toml, "/"=>"//"))
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146 return eval(:(Rational($expr)))
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147 else
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148 return Rational(parsed_toml)
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149 end
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150 end
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151
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152 """
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153 sbp_operators_path()
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154
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155 Calculate the path for the operators folder with included stencil sets.
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156
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157 See also [`read_stencil_set`](@ref)
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158 """
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159 sbp_operators_path() = (@__DIR__) * "/operators/"