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annotate src/SbpOperators/readoperator.jl @ 989:7bf3121c6864 feature/stencil_set_type

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Add type StencilSet
author Vidar Stiernström <vidar.stiernstrom@it.uu.se>
date Thu, 17 Mar 2022 21:31:20 +0100
parents 568058183791
children b6238afd3bb0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 StencilSet
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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 StencilSet
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14
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15 A `StencilSet` contains a set of associated stencils. The stencils
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16 are are stored in a table, and can be accesed by indexing into the `StencilSet`.
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17 """
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18 struct StencilSet
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19 table
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20 end
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21
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22 """
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23 StencilSet(filename; filters)
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24
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25 Creates a `StencilSet` from a TOML file based on some key-value
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26 filters. If more than one set matches the filters an error is raised. The
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27 table of the `StencilSet` is a parsed TOML intended for functions like
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28 `parse_scalar` and `parse_stencil`.
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29
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30 The `StencilSet` table is not parsed beyond the inital TOML parse. To get usable
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31 stencils use the `parse_stencil` functions on the fields of the stencil set.
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32
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33 The reason for this is that since stencil sets are intended to be very
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34 general, and currently do not include any way to specify how to parse a given
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35 section, the exact parsing is left to the user.
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36
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37 For more information see [Operator file format](@ref) in the documentation.
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38
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39 See also [`sbp_operators_path`](@ref), [`get_stencil_set`](@ref), [`parse_stencil`](@ref), [`parse_scalar`](@ref), [`parse_tuple`](@ref),.
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40 """
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41 StencilSet(filename; filters...) = StencilSet(get_stencil_set(TOML.parsefile(filename); filters...))
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42 Base.getindex(set::StencilSet,I...) = set.table[I...]
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43
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44 """
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45 get_stencil_set(parsed_toml; filters...)
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46
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47 Picks out a stencil set from an already parsed TOML based on some key-value
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48 filters.
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49
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50 See also [`StencilSet`](@ref).
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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(parsed_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 See also [`StencilSet`](@ref), [`parse_scalar`](@ref), [`parse_tuple`](@ref).
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77 """
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78 function parse_stencil(parsed_toml)
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79 check_stencil_toml(parsed_toml)
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80
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81 if parsed_toml isa Array
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82 weights = parse_rational.(parsed_toml)
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83 return CenteredStencil(weights...)
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84 end
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85
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86 weights = parse_rational.(parsed_toml["s"])
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87 return Stencil(weights..., center = parsed_toml["c"])
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88 end
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89
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90 """
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91 parse_stencil(T, parsed_toml)
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92
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93 Parses the input as a stencil with element type `T`.
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94 """
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95 parse_stencil(T, parsed_toml) = Stencil{T}(parse_stencil(parsed_toml))
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96
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97 function check_stencil_toml(parsed_toml)
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98 if !(parsed_toml isa Dict || parsed_toml isa Vector{String})
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99 throw(ArgumentError("the TOML for a stencil must be a vector of strings or a table."))
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100 end
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101
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102 if parsed_toml isa Vector{String}
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103 return
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104 end
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105
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106 if !(haskey(parsed_toml, "s") && haskey(parsed_toml, "c"))
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107 throw(ArgumentError("the table form of a stencil must have fields `s` and `c`."))
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108 end
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109
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110 if !(parsed_toml["s"] isa Vector{String})
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111 throw(ArgumentError("a stencil must be specified as a vector of strings."))
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112 end
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113
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114 if !(parsed_toml["c"] isa Int)
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115 throw(ArgumentError("the center of a stencil must be specified as an integer."))
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116 end
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117 end
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118
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119 """
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120 parse_scalar(parsed_toml)
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121
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122 Parse a scalar, represented as a string or a number in the TOML, and return it as a `Rational`
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123
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124 See also [`StencilSet`](@ref), [`parse_stencil`](@ref) [`parse_tuple`](@ref).
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125 """
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126 function parse_scalar(parsed_toml)
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127 try
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128 return parse_rational(parsed_toml)
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129 catch e
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130 throw(ArgumentError("must be a number or a string representing a number."))
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131 end
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132 end
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133
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134 """
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135 parse_tuple(parsed_toml)
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136
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137 Parse an array as a tuple of scalars.
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138
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139 See also [`StencilSet`](@ref), [`parse_stencil`](@ref), [`parse_scalar`](@ref).
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140 """
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141 function parse_tuple(parsed_toml)
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142 if !(parsed_toml isa Array)
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143 throw(ArgumentError("argument must be an array"))
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144 end
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145 return Tuple(parse_scalar.(parsed_toml))
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146 end
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147
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148
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149 """
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150 parse_rational(parsed_toml)
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151
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152 Parse a string or a number as a rational.
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153 """
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154 function parse_rational(parsed_toml)
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155 if parsed_toml isa String
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156 expr = Meta.parse(replace(parsed_toml, "/"=>"//"))
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157 return eval(:(Rational($expr)))
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158 else
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159 return Rational(parsed_toml)
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160 end
249
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161 end
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162
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163 """
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164 sbp_operators_path()
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165
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166 Calculate the path for the operators folder with included stencil sets.
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167
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168 See also [`StencilSet`](@ref)
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169 """
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170 sbp_operators_path() = (@__DIR__) * "/operators/"