Mercurial > hgrepos > Python > libs > pygments-lexer-pseudocode2

annotate docs/lexer-algpseudocode.rst @ 263:2e78e255b54e

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Make a link to the reST source where appropriate to learn about the lexer syntax
author Franz Glasner <fzglas.hg@dom66.de>
date Tue, 19 May 2026 18:03:48 +0200
parents 7df1fd3bab87
children e5ea2f955986
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 .. -*- coding: utf-8; indent-tabs-mode: nil; -*-
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4 *************************************
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5 AlgPseudocode and Language Variants
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6 *************************************
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8 .. only:: html
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9
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10 .. hint::
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11 The reST source of this documentation page can be found
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12 `here <_sources/lexer-algpseudocode.rst.txt>`_.
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13
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14 These lexers are heavily inspired by CTAN’s `Algpseudocodex`_.
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15 They recognize all sorts of single- and multi-line comments in addition to
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16 expressions and commands that are inspired by `Algpseudocodex`_.
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18 They may be used in `Sphinx`_ by their aliases.
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19 The code-block:
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21 .. code-block:: none
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23 .. code-block:: algpseudocode
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25 \PROGRAM {The Pseudoprogram} \IS
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27 \END PROGRAM {The Pseudoprogram}
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29 will be rendered as:
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31 .. code-block:: algpseudocode
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33 \PROGRAM {The Pseudoprogram} \IS
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35 \END PROGRAM {The Pseudoprogram}
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37 And the same code-block with the german variant
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38 (using ``.. code-block:: algpseudocode-de`` as language alias):
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40 .. code-block:: algpseudocode-de
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42 \PROGRAM {The Pseudoprogram} \IS
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44 \END PROGRAM {The Pseudoprogram}
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47 States
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48 ======
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50 The AlgPseudocode lexer and its language variants AlgPseudocodeDE and
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51 AlgPseudocodeFR basically work in three states (aka modes or contexts):
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52 `default`, `expression` and `text`.
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54 In `expressions` it automatically recognizes:
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56 - Strings (single-quote, double-quote, triple-single-quote,
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57 triple-double-quote, `Python`_ style)
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58 - Numbers (also `Python`_ style)
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59 - (Mathematical) operators and symbols
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60 - ``\TEXT{...}``
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62 To switch in a text-mode that prohibits automatic expression
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63 highlighting.
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65 A closing curly brace can be quoted with ``\}`` to not end the
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66 text mode prematurely.
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68 - ``\EXPR`` or ``\EXPRESSION`` as nested construct
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70 - ``\NAME``, ``\CALL`` and ``\GETS``
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72 - ``\REM`` and ``\REMARK`` for remarks (aka comments)
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74 - Names (`Name.Entity`)
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76 - :ref:`explicit-token-types`
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78 In the `default`-mode it recognizes all sorts of single- and multi-line
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79 comments in addition to expressions and commands that are inspired by
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80 `Algpseudocodex`_.
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82 In `texts` it recognizes:
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84 - ``\EXPR`` or ``\EXPRESSION``
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86 To switch to expression-mode.
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88 A closing curly brace can be quoted with ``\}`` to not end the expression
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89 mode prematurely.
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91 - ``\TEXT`` as nested construct
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93 - ``\REM`` and ``\REMARK`` for remarks (aka comments)
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95 - :ref:`explicit-token-types`
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98 Lexer Options
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99 =============
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101 .. describe:: prohibit_raiseonerror_filter
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103 **Type:** :py:class:`bool`
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104
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105 **Default:** :py:obj:`None`
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107 If :py:obj:`True` the `raiseonerror` filter is not allowed to be
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108 applied by `Sphinx`_ when :py:meth:`Lexer.add_filter` is called.
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110 This setting does not apply to filters that are set by the standard
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111 lexer option `filters`.
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113 .. describe:: no_end
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115 **Type:** :py:class:`bool`
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117 **Default:** :py:obj:`False`
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119 If :py:obj:`True` all the ``\ENDxxx`` commands will be skipped and yield
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120 no output.
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122 .. describe:: gets
125
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123
165
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124 **Type:** :py:class:`str` or :py:obj:`None`
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125
212
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126 **Default:** :py:obj:`None` (yields ``⟵``)
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127
142
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128 The operator symbol to be printed by the command ``\GETS``.
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129
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130 An often used alternative is ``:=``.
125
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131
142
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132 .. describe:: remark
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133
165
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134 **Type:** :py:class:`str` or :py:obj:`None`
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135
172
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136 **Default:** :py:obj:`None` (yields ``▷``)
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137
142
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138 The symbol to be printed as when starting comments with
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139 ``\REMARK`` or ``\REM``.
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140
144
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141 To use a lexer with non-default options in `Sphinx`_ see section
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142 :ref:`customized-sphinx-lexers`.
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143
125
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144
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145 Comments
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146 ========
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147
150
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148 - with the ``\REMARK`` or ``\REM`` keywords (this includes a leading symbol)
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149 - multi-line comments with ``/* ... */``; they can be **nested**
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150 - multi-line comments with ``(* ... *)``; they can be **nested**
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151 - single-line comments with ``//`` or ``#`` (until the end of the line)
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152
150
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153 .. code-block:: algpseudocode
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154
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155 /*
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156 * A single multiline comment
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157 */
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158
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159 /*
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160 * A multiline comment
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161 *
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162 * /* This is a nested multi-line comment */
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163 *
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164 */
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165
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166 (*
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167 * A multiline comment
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168 *
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169 * (* This is a nested multi-line comment *)
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170 *
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171 *)
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172
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173 // A single-line comment
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174
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175 # A single-line comment
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176
213
d470250f8451 Title/metadata of PDF documentation builds:
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177 \REM A remark is a single-line comment with a leading symbol
150
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178
125
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179
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180 Literals
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181 ========
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182
150
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183 Strings and numbers as in `Python`_. String prefixes ``r``, ``f`` and ``t``
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184 are not supported -- ``u`` and ``b`` are.
125
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185
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186 To yield non-string-delimiting single- and double-quotes you have to escape them
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187 using ``\'`` or ``\"``. This must be used to typeset something as
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188 :algpseudocode:`f\\'(x) = 0`.
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189
150
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190 .. code-block:: algpseudocode
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191
241
7df1fd3bab87 In the number example use 1234567890 also
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192 0 1234567890 0xdead 0b100001 0o720 2.7 2.7e-54
150
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193
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194 "A string with an escaped double-quote \" "
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195
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196 'Another string with an escaped single-quote \' '
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197
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198 """A multiline
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199 string
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200 """
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201
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202 '''Another multiline string
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203
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204 '''
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205
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206 b"A \x20 byte string"
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207
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208 u'An explicit Unicode \u1234 string'
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209
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210 \" a non string
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211
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212 \' a non string also
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213
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214
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215 (Mathematical) Symbols and Operators
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216 ====================================
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217
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218 Some ASCII symbol combinations are recognized and replaced by a
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219 Unicode symbol:
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220
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221 .. code-block:: algpseudocode
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222
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223 \TEXT{<=>} <=>
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224 \TEXT{<->} <->
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225 \TEXT{<-} <-
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226 \TEXT{->} ->
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227 \TEXT{=>} =>
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228 \TEXT{<=} <=
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229 \TEXT{>=} >=
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230 \TEXT{<>} <>
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231 \TEXT{!=} !=
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232 \TEXT{:=} :=
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233 \TEXT{=:} =:
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234 \TEXT{?=} ?=
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235
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236 Unicode codepoints with property ``Sm`` are recognized as mathematical symbol
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237 and highlighted accordingly.
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238
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239
159
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240 Punctuation
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241 ===========
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242
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243 Runs of dots ``.``, ``..``, ``...``, ``....``, ... are handled
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244 properly in expressions and yield a punctuation token.
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245 They are not replaced by corresponding Unicode symbols.
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246
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247
169
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248 Commands
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249 ========
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250
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251 - Start with a backslash character ``\``
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252 - Case-insensitive
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253 - Yield mostly to :py:class:`pygments.Token.Keyword`
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254 - Translated if a translation is found
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255 - Depending on the command---may have required or optional parameters
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256
169
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257 Parameter handling is as follows:
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258
169
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259 * Parameters are enclosed in curly braces ``{`` and ``}``
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260 * Escaping within the braces is possible using the backslash ``\`` as
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261 escape character
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262 * Parameters are separated from the keyword/command by a (possibly empty) run
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263 of space or TAB characters.
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264 This is true for required and optional parameters.
209
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265 - Unrecognized commands typically result in a
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266 :py:class:`pygments.token.Token.Error` token.
162
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267
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268 More on escaping rules you can find in :ref:`this chapter <escaping-rules>`.
162
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269
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270
169
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271 Commands With Required Parameters
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272 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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273
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274 .. code-block:: algpseudocode
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275
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276 \TEXT{\PROGRAM {A Program\} or \PROG {A Program\}} \PROGRAM {A Program}
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277 \TEXT{\ALGORITHM{An Algorithm\} or \ALGO{An Algorithm\}} \ALGORITHM{An Algorithm}
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278 \TEXT{\PROCEDURE{A Procedure\} or \PROC{A Procedure\}} \PROCEDURE{A Procedure}
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279 \TEXT{\FUNCTION{A Function\} or \FUNC{A Function\} or \FN{A Function\}} \FUNCTION{A Function}
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280 \TEXT{\CLASS{A Class\}} \CLASS{A Class}
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281
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282 \TEXT{\STATEMENT{the expression\} \STATE{the expression\} \BLOCK{the expression\}} \STATEMENT{the expression}
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283
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284 \TEXT{expr1: \\EXPRESSION{expression a in b\} expr2: \\EXPR{expression b in a\}} \TEXT{expr1: \EXPRESSION{expression a in b} expr2: \EXPR{expression b in a}}
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285
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286 \TEXT{\TEXTSTATEMENT{the text\} \TEXTSTATE{the text\} \TSTATEMENT{the text\} \TSTATE{the text\} \TEXTBLOCK{the text\} \TBLOCK{the text\}} \TEXTSTATEMENT{the text}
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287
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288 \TEXT{\INPUT{Input 1\}} \INPUT{Input 1}
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289 \TEXT{\INPUTS{Input 2\}} \INPUTS{Input 2}
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290
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291 \TEXT{\OUTPUT{Output 1\}} \OUTPUT{Output 1}
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292 \TEXT{\OUTPUTS{Output 2\}} \OUTPUTS{Output 2}
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293
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294 \TEXT{\ENSURE{Whatever should be ensured!\}} \ENSURE{Whatever should be ensured!}
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295
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296 \TEXT{\REQUIRE{Whatever should be required.\}} \REQUIRE{Whatever should be required.}
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297
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298 \TEXT{\RETURNS{Return 2\}} \RETURNS{Return 2}
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299
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300 \TEXT{\CALL{a function\}(p1, p2)} \CALL{a function}(p1, p2)
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301
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302 \TEXT{\NAME{an entity name\}} \NAME{an entity name}
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303
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304
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305 Commands With Optional Parameters
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306 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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307
169
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308 Some ``END``-commands have optional parameters:
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309
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310 .. code-block:: algpseudocode
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311
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312 \TEXT{\ENDPROGRAM \ENDPROG} \ENDPROGRAM
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313 \TEXT{\ENDALGORITHM \ENDALGO} \ENDALGORITHM
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314 \TEXT{\ENDPROCEDURE \ENDPROC} \ENDPROCEDURE
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315 \TEXT{\ENDFUNCTION \ENDFUNC \ENDFN} \ENDFUNCTION
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316 \TEXT{\ENDCLASS} \ENDCLASS
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317
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318 They are used like this:
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319
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320 .. code-block:: algpseudocode
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321
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322 \TEXT{\CLASS{Foo Bar Class\} ... \END CLASS {Foo Bar Class\}} \TEXT{yields} \CLASS{Foo Bar Class} ... \END CLASS {Foo Bar Class}
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323
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324 \TEXT{\CLASS{Foo Bar Class\} ... \END CLASS} \TEXT{yields} \CLASS{Foo Bar Class} ... \END CLASS
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325
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326 .. seealso:: For other syntax variants concerning `END` see also section
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327 `END-Commands`_.
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328
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329
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330 Commands Without Parameters
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331 ~~~~~~~~~~~~~~~~~~~~~~~~~~~
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332
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333 "Normal" Commands
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334 '''''''''''''''''
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335
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336 .. code-block:: algpseudocode
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337
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338 \TEXT{\IF} \IF
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339 \TEXT{\THEN} \THEN
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340 \TEXT{\ELSE} \ELSE
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341 \TEXT{\ELSEIF or \ELSIF or \ELIF} \ELSEIF \text{or} \ELSIF \text{or} \ELIF
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342 \TEXT{\DO} \DO
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343 \TEXT{\WHILE} \WHILE
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344 \TEXT{\FORALL} \FORALL
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345 \TEXT{\FOR} \FOR
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346 \TEXT{\FROM} \FROM
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347 \TEXT{\TO} \TO
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348 \TEXT{\STEP} \STEP
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349 \TEXT{\IN} \IN
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350 \TEXT{\LOOP} \LOOP
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351 \TEXT{\REPEAT} \REPEAT
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352 \TEXT{\UNTIL} \UNTIL
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353
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354 \TEXT{\RETURN} \RETURN
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355
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356 \TEXT{\BEGIN} \BEGIN
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357 \TEXT{\END} \END
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358
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359 \TEXT{\IS} \IS
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360 \TEXT{\WITH} \WITH
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361
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362 \TEXT{\GETS} \GETS
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363
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364 \TEXT{\\REMARK or \\REM} \REMARK A comment with a leading symbol
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365
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366 ``\REMARK`` or ``\REM`` is special: all characters to the end of the
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367 line are taken as comment; curly braces are not needed---in fact:
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368 they are interpreted to be part of the comment.
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369
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370
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371 END-Commands
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372 ''''''''''''
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373
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374 The separator character can be empty, a run of ASCII spaces, a run of
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375 TAB characters, a single underscore ``_`` or a single hyphen ``-``
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376 like:
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377
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378 ``\ENDIF``, ``\END IF``, ``\END-IF``, ``\END_IF`` or ``\END IF``
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379
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380
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381 .. code-block:: algpseudocode
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382
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383 \text{\ENDIF} \ENDIF \rem empty
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384
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385 \text{\END IF} \END IF \rem a single space
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386
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387 \text{\END IF} \END IF \rem two spaces
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388
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389 \text{\END-IF} \END-IF \rem a single hyphen
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390
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391 \text{\END_IF} \END_IF \rem a single underscore
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392
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393 \text{\END IF} \END IF \rem a single TAB character
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394
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395 The list of END-commands (here always just with ``-`` as separator):
125
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396
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397 .. code-block:: algpseudocode
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398
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399 \text{\END-PROGRAM \END-PROG} \END-PROGRAM
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400 \text{\END-ALGORITHM \END-ALGO} \END-ALGORITHM
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401 \text{\END-PROCEDURE \END-PROC} \END-PROCEDURE
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402 \text{\END-FUNCTION \END-FUNC \END-FN} \END-FUNCTION
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403 \text{\END-CLASS} \END-CLASS
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404 \text{\END-IF} \END-IF
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405 \text{\END-WHILE} \END-WHILE
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406 \text{\END-FOR} \END-FOR
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407 \text{\END-FORALL} \END-FORALL
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408 \text{\END-LOOP} \END-LOOP
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409
169
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410 .. note:: The output of END-commands can be suppressed by setting the
172
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411 lexer option ``no_end`` to :py:obj:`True`.
169
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412
88
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413
150
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414 Names and Entities
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415 ==================
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416
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417 In an expression context all other words are interpreted as entity
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418 names (token type :py:class:`pygments.token.Token.Name.Entity`).
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419
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420 Allowed characters in the words follow the corresponding `Python`_ rules.
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421 As such, many Unicode characters are allowed.
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422
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423 To highlight entity names with whitespace or other "special" characters in it
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424 use the ``NAME`` command.
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425
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426 .. code-block:: algpseudocode
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427
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428 \TEXT{entity_name_1} entity_name_1
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429
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430 \TEXT{entity_name_2} entity_name_2
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431
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432 \TEXT{\NAME{entity-name 3\}} \NAME{entity-name 3}
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433
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434 \TEXT{München} München
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435
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436 \TEXT{Genève} Genève
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437
169
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438
150
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439 .. _explicit-token-types:
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440
88
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441 Explicit Token Types
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442 ====================
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443
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444 Handle keywords and operators that are not handled by default or change
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445 the default handling of some expressions.
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446
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447 `XX` represents a `value` in the :py:data:`pygments.token.STANDARD_TYPES`
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448 dict.
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449 Its corresponding token type (the associated `key` in this `dict`) is
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450 used as token type.
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451
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452 ``\tt-XX/SINGLE-CHAR``
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453
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454 no escaping needed
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455
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456 `SINGLE-CHAR` is a single character and can be *every* character
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457 (including a carriage-return or line-feed)
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458
237
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459 ``\ttx-XX{CHARACTERS}``
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460
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461 ``\ttx-XX(CHARACTERS)``
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462
237
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463 ``\ttx-XX[CHARACTERS]``
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464
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465 ``\ttx-XX<CHARACTERS>``
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466
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467 ``\ttx-XX<SEP>CHARACTERS<SEP>``
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468
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469 No escaping possible! There are enough alternatives available!
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470
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471 `SEP` is one of ``/:|=*+!\$~``.
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472
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473
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474 Examples:
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475
125
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476 .. code-block:: algpseudocode
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477
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478 \text{• \\tt-kc/C} \tt-kc/C \rem C as Keyword.Constant
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479 \text{• \\tt-ow/∈} \tt-ow/∈ \rem ∈ as Operator.Word
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480 \text{• \\ttx-kc{A New Constant Keyword\}} \ttx-kc{A New Constant Keyword} \rem As a new Keyword.Constant
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481 \text{• \\ttx-nv{A New Variable Name\}} \ttx-nv{A New Variable Name} \rem An explicit Name.Variable
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482 \text{• \\ttx-k(∈ ∌)} \ttx-k(∈ ∌) \rem ∈ and ∌ as (ordinary) Keywords
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483 \text{• \\ttx-o<∈ ∌>} \ttx-o<∈ ∌> \rem ∈ and ∌ as (ordinary) Operators
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484 /*
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485 * The line below has ∈_∌ as (peculiar) function name.
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486 * Their params are automatic (i.e. a normal expression).
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487 */
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488 \text{• \\ttx-nf<∈_∌>(p1, p2)} \ttx-nf<∈_∌>(p1, p2)
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489 /*
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490 * The line below has ∈_∌ as (peculiar) decorator name (as used in Python).
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491 * Their params are automatic (i.e. a normal expression).
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492 */
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493 \text{• \\ttx-nd[∈_∌](p1, p2)} \ttx-nd[∈_∌](p1, p2)
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494 /*
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495 * This is a non-existing token type: you get some generic error marking
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496 * with a Generic.Error token and no expansion.
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497 */
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498 \text{• \\ttx-NON-EXISTING[∈_∌](p1, p2)} \ttx-NON_EXISTING[∈_∌](p1, p2)
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499
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500 .. note:: Explicit token types are **case-sensitive**.
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501
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502
209
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503 .. _escaping-rules:
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504
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505 Escaping Rules
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506 ==============
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507
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508 The escape character is a backslash ``\``.
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509
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510 A backslash can be escaped with ``\\`` and yields a single backslash token.
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511
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512 Within parameters a closing curly brace ``}`` ends the current
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513 parameters environment.
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514 It must be escaped using ``\}`` if a closing curly brace is part of the
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515 argument content.
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516
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517 A single backslash yields a :py:class:`pygments.token.Token.Generic.Error`
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518 token when in `default` and `expression` states.
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519 Contrary---in `text` contexts a single backslash character that does not
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520 introduce a command yields a normal text token.
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521
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522 In all contexts a backslash that would normally introduce a known command
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523 must be escaped if the content should not recognized as a command.
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524
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525 Single- and double-quotes must be escaped also (``\"`` or ``\'``) in
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526 `default` and `expression` contexts when they should not introduce a
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527 string token.
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528
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529
144
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530 .. _customized-sphinx-lexers:
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531
125
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532 Customized Lexers in Sphinx
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533 ===========================
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534
144
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535 Defining lexers with non-default options in `Sphinx`_ can be done in its
153
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536 configuration file :file:`conf.py`.
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537
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538 The first option is to apply the Sphinx config value ``highlight_options``
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539 properly. An existing lexer can be customized by options.
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540
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diff changeset
541 A more flexible alternative is to define a new lexer in the Sphinx
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542 application. The very same lexer class can be used with different options:
125
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543
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544 .. code-block:: python
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545
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546 from functools import partial
164
a4317957148b Move all lexers into a subpackage pygments_lexer_pseudocode2.lexers.
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547 from pygments_lexer_pseudocode2.lexers.algpseudocode import AlgPseudocodeLexer
125
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548
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549 def setup(app):
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550
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551 #
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552 # Add a custom lexer: AlgPseudocodeLexer with custom init
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553 # option "no_end".
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554 #
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555 # In modern Sphinx versions given lexer must be callable and may
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556 # not be a lexer instance. So use an indirection with "partial"
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557 # here.
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558 #
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559 app.add_lexer("noend-algpseudocode",
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560 partial(AlgPseudocodeLexer, no_end=True))
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561
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562 Similarily it works for custom styles and filters.
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563
158
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564 .. note:: Lexers in Sphinx are instantiated with the `raiseonerror` filter
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565 applied by default.
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566 This is also true for custom lexers that are added by
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567 :py:meth:`Sphinx.add_lexer`.
207
76053daf813e Extend the note in "Customized Lexers in Sphinx" somewhat
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568 Using the `filters` option the user can associate custom filters
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569 with a lexer.
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570 These filters have precedence over the default `raiseonerror`
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571 filter.
158
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572
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573 Lexer *instances* that are added to
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574 :py:data:`sphinx.highlighting.lexers` somehow are taken as is by
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575 Sphinx and are not augmented with any default filters.
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576
125
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577 For older Sphinx versions your mileage may vary.
169
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578
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579
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580 Some Examples
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581 =============
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582
187
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583 A synthetic example with many features.
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584
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585 .. only:: builder_html
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586
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587 Its source code is in :download:`examples/example-1.pseudocode`.
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588
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589 .. raw:: latex
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590
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591 Its source code can be found at \url{example-1.pseudocode}.
169
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592
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593 .. literalinclude:: examples/example-1.pseudocode
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594 :language: algpseudocode
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595 :lines: 2-
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596
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597 With a customized `AlgPseudocodeLexer` and its `no_end`
172
ad80fcbf7b47 Docs formatting
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598 option set to :py:obj:`True`.
169
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599
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600 .. literalinclude:: examples/example-1.pseudocode
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601 :language: NoEndAlgPseudocode
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602 :lines: 2-
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603
186
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604 The second example is Wikipedia's description of *Dinic's Algorithm*
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605 (see https://en.wikipedia.org/wiki/Dinic%27s_algorithm).
187
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606
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607 .. only:: builder_html
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608
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diff changeset
609 Its source code is in :download:`examples/algorithm-dinic.pseudocode`.
169
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610
187
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611 .. raw:: latex
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612
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diff changeset
613 Its source code can be found at \url{algorithm-dinic.pseudocode}
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614
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615 .. literalinclude:: examples/algorithm-dinic.pseudocode
169
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616 :language: algpseudocode
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617 :lines: 2-
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618
186
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619 The third example is Wikipedia's pseudocode of the *Ford–Fulkerson Algorithm*
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diff changeset
620 (see https://en.wikipedia.org/wiki/Ford%E2%80%93Fulkerson_algorithm).
187
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621
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622 .. only:: builder_html
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623
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624 Its source code is in
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diff changeset
625 :download:`examples/algorithm-ford-fulkerson.pseudocode`.
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626
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627 .. raw:: latex
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628
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diff changeset
629 Its source code can be found at \url{algorithm-ford-fulkerson.pseudocode}.
169
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630
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631 .. literalinclude:: examples/algorithm-ford-fulkerson.pseudocode
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632 :language: algpseudocode
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633 :lines: 2-
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diff changeset
634
186
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diff changeset
635 The fourth example is Wikipedia's pseudocode of the *Edmonds–Karp Algorithm*
169
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diff changeset
636 (see https://en.wikipedia.org/wiki/Edmonds%E2%80%93Karp_algorithm)
194
403b500e0ed4 FIX: Syntax
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diff changeset
637 with a custom lexer which skips all ``ENDxxx`` keywords.
187
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638
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639 .. only:: builder_html
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640
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diff changeset
641 Its source code is in
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642 :download:`examples/algorithm-edmonds-karp.pseudocode`.
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643
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644 .. raw:: latex
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diff changeset
645
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diff changeset
646 Its source code can be found at \url{algorithm-edmonds-karp.pseudocode}.
169
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647
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648 .. literalinclude:: examples/algorithm-edmonds-karp.pseudocode
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649 :language: NoEndAlgPseudocode
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650 :lines: 2-
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651
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652 And now the *Edmonds–Karp Algorithm* with **french** keywords:
169
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653
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654 .. literalinclude:: examples/algorithm-edmonds-karp.pseudocode
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655 :language: algpseudocode-fr
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656 :lines: 2-
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657
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658 And again the *Edmonds–Karp Algorithm* with **german** keywords:
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659
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660 .. literalinclude:: examples/algorithm-edmonds-karp.pseudocode
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661 :language: algpseudocode-de
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662 :lines: 2-