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annotate runtime/indent/mp.vim @ 29248:6a718a4e17ce

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Added tag v8.2.5142 for changeset 5f314b2ed4940d2de3442f11ecb6fd03fc54fded
author Bram Moolenaar <Bram@vim.org>
date Tue, 21 Jun 2022 18:45:08 +0200
parents bdd7fc1a38c0
children f00c56ee8118
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 " MetaPost indent file
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2 " Language: MetaPost
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3 " Maintainer: Nicola Vitacolonna <nvitacolonna@gmail.com>
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4 " Former Maintainers: Eugene Minkovskii <emin@mccme.ru>
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5 " Last Change: 2016 Oct 2, 4:13pm
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6 " Version: 0.2
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7
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8 if exists("b:did_indent")
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9 finish
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10 endif
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11 let b:did_indent = 1
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12
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13 setlocal indentexpr=GetMetaPostIndent()
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14 setlocal indentkeys+==end,=else,=fi,=fill,0),0]
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15
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16 let b:undo_indent = "setl indentkeys< indentexpr<"
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17
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18 " Only define the function once.
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19 if exists("*GetMetaPostIndent")
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20 finish
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21 endif
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dd6c2497c997 Fix more 'cpo' issues in runtime files.
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22 let s:keepcpo= &cpo
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23 set cpo&vim
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24
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25 function GetMetaPostIndent()
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26 let ignorecase_save = &ignorecase
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27 try
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28 let &ignorecase = 0
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29 return GetMetaPostIndentIntern()
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30 finally
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31 let &ignorecase = ignorecase_save
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32 endtry
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33 endfunc
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34
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35 " Regexps {{{
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36 " Note: the next three variables are made global so that a user may add
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37 " further keywords.
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38 "
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39 " Example:
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40 "
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41 " Put these in ~/.vim/after/indent/mp.vim
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42 "
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43 " let g:mp_open_tag .= '\|\<begintest\>'
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44 " let g:mp_close_tag .= '\|\<endtest\>'
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45
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46 " Expressions starting indented blocks
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47 let g:mp_open_tag = ''
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48 \ . '\<if\>'
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49 \ . '\|\<else\%[if]\>'
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50 \ . '\|\<for\%(\|ever\|suffixes\)\>'
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51 \ . '\|\<begingroup\>'
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52 \ . '\|\<\%(\|var\|primary\|secondary\|tertiary\)def\>'
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53 \ . '\|^\s*\<begin\%(fig\|graph\|glyph\|char\|logochar\)\>'
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54 \ . '\|[([{]'
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55
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56 " Expressions ending indented blocks
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57 let g:mp_close_tag = ''
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58 \ . '\<fi\>'
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59 \ . '\|\<else\%[if]\>'
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60 \ . '\|\<end\%(\|for\|group\|def\|fig\|char\|glyph\|graph\)\>'
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61 \ . '\|[)\]}]'
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62
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63 " Statements that may span multiple lines and are ended by a semicolon. To
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64 " keep this list short, statements that are unlikely to be very long or are
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65 " not very common (e.g., keywords like `interim` or `showtoken`) are not
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66 " included.
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67 "
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68 " The regex for assignments and equations (the last branch) is tricky, because
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69 " it must not match things like `for i :=`, `if a=b`, `def...=`, etc... It is
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70 " not perfect, but it works reasonably well.
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71 let g:mp_statement = ''
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72 \ . '\<\%(\|un\|cut\)draw\>'
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73 \ . '\|\<\%(\|un\)fill\%[draw]\>'
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74 \ . '\|\<draw\%(dbl\)\=arrow\>'
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75 \ . '\|\<clip\>'
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76 \ . '\|\<addto\>'
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77 \ . '\|\<save\>'
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78 \ . '\|\<setbounds\>'
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79 \ . '\|\<message\>'
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80 \ . '\|\<errmessage\>'
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81 \ . '\|\<errhelp\>'
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82 \ . '\|\<fontmapline\>'
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83 \ . '\|\<pickup\>'
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84 \ . '\|\<show\>'
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85 \ . '\|\<special\>'
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86 \ . '\|\<write\>'
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87 \ . '\|\%(^\|;\)\%([^;=]*\%('.g:mp_open_tag.'\)\)\@!.\{-}:\=='
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88
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89 " A line ends with zero or more spaces, possibly followed by a comment.
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90 let s:eol = '\s*\%($\|%\)'
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91 " }}}
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92
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93 " Auxiliary functions {{{
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94 " Returns 1 if (0-based) position immediately preceding `pos` in `line` is
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95 " inside a string or a comment; returns 0 otherwise.
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96
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97 " This is the function that is called more often when indenting, so it is
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98 " critical that it is efficient. The method we use is significantly faster
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99 " than using syntax attributes, and more general (it does not require
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100 " syntax_items). It is also faster than using a single regex matching an even
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101 " number of quotes. It helps that MetaPost strings cannot span more than one
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102 " line and cannot contain escaped quotes.
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103 function! s:CommentOrString(line, pos)
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104 let in_string = 0
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105 let q = stridx(a:line, '"')
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106 let c = stridx(a:line, '%')
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107 while q >= 0 && q < a:pos
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108 if c >= 0 && c < q
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109 if in_string " Find next percent symbol
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110 let c = stridx(a:line, '%', q + 1)
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111 else " Inside comment
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112 return 1
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113 endif
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114 endif
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115 let in_string = 1 - in_string
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116 let q = stridx(a:line, '"', q + 1) " Find next quote
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117 endwhile
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118 return in_string || (c >= 0 && c <= a:pos)
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119 endfunction
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120
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121 " Find the first non-comment non-blank line before the current line.
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122 function! s:PrevNonBlankNonComment(lnum)
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123 let l:lnum = prevnonblank(a:lnum - 1)
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124 while getline(l:lnum) =~# '^\s*%'
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125 let l:lnum = prevnonblank(l:lnum - 1)
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126 endwhile
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127 return l:lnum
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128 endfunction
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129
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130 " Returns true if the last tag appearing in the line is an open tag; returns
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131 " false otherwise.
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132 function! s:LastTagIsOpen(line)
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133 let o = s:LastValidMatchEnd(a:line, g:mp_open_tag, 0)
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134 if o == - 1 | return v:false | endif
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135 return s:LastValidMatchEnd(a:line, g:mp_close_tag, o) < 0
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136 endfunction
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137
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138 " A simple, efficient and quite effective heuristics is used to test whether
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139 " a line should cause the next line to be indented: count the "opening tags"
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140 " (if, for, def, ...) in the line, count the "closing tags" (endif, endfor,
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141 " ...) in the line, and compute the difference. We call the result the
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142 " "weight" of the line. If the weight is positive, then the next line should
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143 " most likely be indented. Note that `else` and `elseif` are both opening and
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144 " closing tags, so they "cancel out" in almost all cases, the only exception
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145 " being a leading `else[if]`, which is counted as an opening tag, but not as
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146 " a closing tag (so that, for instance, a line containing a single `else:`
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147 " will have weight equal to one, not zero). We do not treat a trailing
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148 " `else[if]` in any special way, because lines ending with an open tag are
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149 " dealt with separately before this function is called (see
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150 " GetMetaPostIndentIntern()).
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151 "
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152 " Example:
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153 "
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154 " forsuffixes $=a,b: if x.$ = y.$ : draw else: fill fi
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155 " % This line will be indented because |{forsuffixes,if,else}| > |{else,fi}| (3 > 2)
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156 " endfor
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157
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158 function! s:Weight(line)
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159 let [o, i] = [0, s:ValidMatchEnd(a:line, g:mp_open_tag, 0)]
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160 while i > 0
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161 let o += 1
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162 let i = s:ValidMatchEnd(a:line, g:mp_open_tag, i)
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163 endwhile
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164 let [c, i] = [0, matchend(a:line, '^\s*\<else\%[if]\>')] " Skip a leading else[if]
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165 let i = s:ValidMatchEnd(a:line, g:mp_close_tag, i)
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166 while i > 0
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167 let c += 1
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168 let i = s:ValidMatchEnd(a:line, g:mp_close_tag, i)
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169 endwhile
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170 return o - c
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171 endfunction
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172
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173 " Similar to matchend(), but skips strings and comments.
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174 " line: a String
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175 function! s:ValidMatchEnd(line, pat, start)
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176 let i = matchend(a:line, a:pat, a:start)
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177 while i > 0 && s:CommentOrString(a:line, i)
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178 let i = matchend(a:line, a:pat, i)
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179 endwhile
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180 return i
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181 endfunction
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182
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183 " Like s:ValidMatchEnd(), but returns the end position of the last (i.e.,
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184 " rightmost) match.
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185 function! s:LastValidMatchEnd(line, pat, start)
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186 let last_found = -1
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187 let i = matchend(a:line, a:pat, a:start)
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188 while i > 0
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189 if !s:CommentOrString(a:line, i)
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190 let last_found = i
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191 endif
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192 let i = matchend(a:line, a:pat, i)
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193 endwhile
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194 return last_found
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195 endfunction
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196
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197 function! s:DecreaseIndentOnClosingTag(curr_indent)
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198 let cur_text = getline(v:lnum)
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199 if cur_text =~# '^\s*\%('.g:mp_close_tag.'\)'
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200 return max([a:curr_indent - shiftwidth(), 0])
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201 endif
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202 return a:curr_indent
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203 endfunction
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204 " }}}
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205
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206 " Main function {{{
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207 "
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208 " Note: Every rule of indentation in MetaPost is very subjective. We might get
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209 " creative, but things get murky very soon (there are too many corner cases).
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210 " So, we provide a means for the user to decide what to do when this script
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211 " doesn't get it. We use a simple idea: use '%>', '%<' and '%=' to explicitly
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212 " control indentation. The '<' and '>' symbols may be repeated many times
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213 " (e.g., '%>>' will cause the next line to be indented twice).
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214 "
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215 " By using '%>...', '%<...' and '%=', the indentation the user wants is
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216 " preserved by commands like gg=G, even if it does not follow the rules of
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217 " this script.
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218 "
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219 " Example:
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220 "
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221 " def foo =
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222 " makepen(
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223 " subpath(T-n,t) of r %>
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224 " shifted .5down %>
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225 " --subpath(t,T) of r shifted .5up -- cycle %<<<
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226 " )
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227 " withcolor black
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228 " enddef
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229 "
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230 " The default indentation of the previous example would be:
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231 "
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232 " def foo =
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233 " makepen(
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234 " subpath(T-n,t) of r
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235 " shifted .5down
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236 " --subpath(t,T) of r shifted .5up -- cycle
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237 " )
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238 " withcolor black
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239 " enddef
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240 "
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241 " Personally, I prefer the latter, but anyway...
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242 function! GetMetaPostIndentIntern()
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243 " Do not touch indentation inside verbatimtex/btex.. etex blocks.
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244 if synIDattr(synID(v:lnum, 1, 1), "name") =~# '^mpTeXinsert$\|^tex\|^Delimiter'
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245 return -1
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246 endif
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247
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248 " This is the reference line relative to which the current line is indented
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249 " (but see below).
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250 let lnum = s:PrevNonBlankNonComment(v:lnum)
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251
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252 " At the start of the file use zero indent.
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253 if lnum == 0
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254 return 0
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255 endif
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256
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257 let prev_text = getline(lnum)
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258
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259 " User-defined overrides take precedence over anything else.
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260 " See above for an example.
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261 let j = match(prev_text, '%[<>=]')
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262 if j > 0
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263 let i = strlen(matchstr(prev_text, '%>\+', j)) - 1
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264 if i > 0
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265 return indent(lnum) + i * shiftwidth()
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266 endif
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267
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268 let i = strlen(matchstr(prev_text, '%<\+', j)) - 1
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269 if i > 0
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270 return max([indent(lnum) - i * shiftwidth(), 0])
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271 endif
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272
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273 if match(prev_text, '%=', j)
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274 return indent(lnum)
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275 endif
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276 endif
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277
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278 " If the reference line ends with an open tag, indent.
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279 "
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280 " Example:
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281 "
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282 " if c:
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283 " 0
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284 " else:
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285 " 1
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286 " fi if c2: % Note that this line has weight equal to zero.
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287 " ... % This line will be indented
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288 if s:LastTagIsOpen(prev_text)
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289 return s:DecreaseIndentOnClosingTag(indent(lnum) + shiftwidth())
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290 endif
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291
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292 " Lines with a positive weight are unbalanced and should likely be indented.
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293 "
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294 " Example:
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295 "
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296 " def f = enddef for i = 1 upto 5: if x[i] > 0: 1 else: 2 fi
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297 " ... % This line will be indented (because of the unterminated `for`)
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298 if s:Weight(prev_text) > 0
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299 return s:DecreaseIndentOnClosingTag(indent(lnum) + shiftwidth())
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300 endif
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301
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302 " Unterminated statements cause indentation to kick in.
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303 "
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304 " Example:
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305 "
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306 " draw unitsquare
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307 " withcolor black; % This line is indented because of `draw`.
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308 " x := a + b + c
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309 " + d + e; % This line is indented because of `:=`.
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310 "
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311 let i = s:LastValidMatchEnd(prev_text, g:mp_statement, 0)
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312 if i >= 0 " Does the line contain a statement?
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313 if s:ValidMatchEnd(prev_text, ';', i) < 0 " Is the statement unterminated?
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314 return indent(lnum) + shiftwidth()
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315 else
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316 return s:DecreaseIndentOnClosingTag(indent(lnum))
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317 endif
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318 endif
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319
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320 " Deal with the special case of a statement spanning multiple lines. If the
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321 " current reference line L ends with a semicolon, search backwards for
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322 " another semicolon or a statement keyword. If the latter is found first,
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323 " its line is used as the reference line for indenting the current line
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324 " instead of L.
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325 "
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326 " Example:
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327 "
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328 " if cond:
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329 " draw if a: z0 else: z1 fi
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330 " shifted S
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331 " scaled T; % L
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332 "
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333 " for i = 1 upto 3: % <-- Current line: this gets the same indent as `draw ...`
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334 "
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335 " NOTE: we get here only if L does not contain a statement (among those
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336 " listed in g:mp_statement).
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337 if s:ValidMatchEnd(prev_text, ';'.s:eol, 0) >= 0 " L ends with a semicolon
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338 let stm_lnum = s:PrevNonBlankNonComment(lnum)
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339 while stm_lnum > 0
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340 let prev_text = getline(stm_lnum)
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341 let sc_pos = s:LastValidMatchEnd(prev_text, ';', 0)
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342 let stm_pos = s:ValidMatchEnd(prev_text, g:mp_statement, sc_pos)
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343 if stm_pos > sc_pos
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344 let lnum = stm_lnum
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345 break
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346 elseif sc_pos > stm_pos
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347 break
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348 endif
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349 let stm_lnum = s:PrevNonBlankNonComment(stm_lnum)
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350 endwhile
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351 endif
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352
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353 return s:DecreaseIndentOnClosingTag(indent(lnum))
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354 endfunction
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355 " }}}
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356
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357 let &cpo = s:keepcpo
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358 unlet s:keepcpo
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359
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360 " vim:sw=2:fdm=marker