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1 " MetaPost indent file
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2 " Language: MetaPost
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3 " Maintainer: Eugene Minkovskii <emin@mccme.ru>
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4 " Last Change: 2003 Nov 21
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5 " Version: 0.1
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6 " ==========================================================================
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7
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8 " Identation Rules: {{{1
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9 " First of all, MetaPost language don't expect any identation rules.
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10 " This screept need for you only if you (not MetaPost) need to do
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11 " exactly code. If you don't need to use indentation, see
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12 " :help filetype-indent-off
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13 "
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14 " Note: Every rules of identation in MetaPost or TeX languages (and in some
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15 " other of course) is very subjective. I can release only my vision of this
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16 " promlem.
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17 "
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18 " ..........................................................................
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19 " Example of correct (by me) identation {{{2
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20 " shiftwidth=4
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21 " ==========================================================================
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22 " for i=0 upto 99:
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23 " z[i] = (0,1u) rotated (i*360/100);
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24 " endfor
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25 " draw z0 -- z10 -- z20
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26 " withpen ... % <- 2sw because breaked line
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27 " withcolor ...; % <- same as previous
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28 " draw z0 for i=1 upto 99:
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29 " -- z[i] % <- 1sw from left end of 'for' satement
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30 " endfor withpen ... % <- 0sw from left end of 'for' satement
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31 " withcolor ...; % <- 2sw because breaked line
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32 " draw if One: % <- This is internal if (like 'for' above)
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33 " one
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34 " elsif Other:
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35 " other
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36 " fi withpen ...;
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37 " if one: % <- This is external if
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38 " draw one;
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39 " elseif other:
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40 " draw other;
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41 " fi
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42 " draw z0; draw z1;
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43 " }}}
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44 " }}}
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45
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46 " Only load this indent file when no other was loaded.
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47 if exists("b:did_indent")
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48 finish
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49 endif
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50 let b:did_indent = 1
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51
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52 setlocal indentexpr=GetMetaPostIndent()
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53 setlocal indentkeys+=;,<:>,=if,=for,=def,=end,=else,=fi
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54
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55 " Only define the function once.
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56 if exists("*GetMetaPostIndent")
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57 finish
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58 endif
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59
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60 " Auxiliary Definitions: {{{1
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61 function! MetaNextNonblankNoncomment(pos)
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62 " Like nextnonblank() but ignore comment lines
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63 let tmp = nextnonblank(a:pos)
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64 while tmp && getline(tmp) =~ '^\s*%'
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65 let tmp = nextnonblank(tmp+1)
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66 endwhile
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67 return tmp
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68 endfunction
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69
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70 function! MetaPrevNonblankNoncomment(pos)
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71 " Like prevnonblank() but ignore comment lines
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72 let tmp = prevnonblank(a:pos)
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73 while tmp && getline(tmp) =~ '^\s*%'
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74 let tmp = prevnonblank(tmp-1)
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75 endwhile
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76 return tmp
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77 endfunction
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78
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79 function! MetaSearchNoncomment(pattern, ...)
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80 " Like search() but ignore commented areas
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81 if a:0
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82 let flags = a:1
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83 elseif &wrapscan
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84 let flags = "w"
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85 else
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86 let flags = "W"
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87 endif
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88 let cl = line(".")
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89 let cc = col(".")
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90 let tmp = search(a:pattern, flags)
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91 while tmp && synIDattr(synID(line("."), col("."), 1), "name") =~
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92 \ 'm[fp]\(Comment\|TeXinsert\|String\)'
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93 let tmp = search(a:pattern, flags)
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94 endwhile
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95 if !tmp
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96 call cursor(cl,cc)
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97 endif
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98 return tmp
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99 endfunction
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100 " }}}
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101
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102 function! GetMetaPostIndent()
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103 " not indent in comment ???
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104 if synIDattr(synID(line("."), col("."), 1), "name") =~
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105 \ 'm[fp]\(Comment\|TeXinsert\|String\)'
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106 return -1
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107 endif
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108 " Some RegExps: {{{1
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109 " end_of_item: all of end by ';'
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110 " + all of end by :endfor, :enddef, :endfig, :endgroup, :fi
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111 " + all of start by :beginfig(num), :begingroup
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112 " + all of start by :for, :if, :else, :elseif and end by ':'
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113 " + all of start by :def, :vardef and end by '='
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114 let end_of_item = '\(' .
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115 \ ';\|' .
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116 \ '\<\(end\(for\|def\|fig\|group\)\|fi\)\>\|' .
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117 \ '\<begin\(group\>\|fig\s*(\s*\d\+\s*)\)\|' .
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118 \ '\<\(for\|if\|else\(if\)\=\)\>.\+:\|' .
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119 \ '\<\(var\)\=def\>.\+=' . '\)'
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120 " }}}
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121 " Save: current position {{{1
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122 let cl = line (".")
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123 let cc = col (".")
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124 let cs = getline(".")
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125 " if it is :beginfig or :endfig use zero indent
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126 if cs =~ '^\s*\(begin\|end\)fig\>'
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127 return 0
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128 endif
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129 " }}}
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130 " Initialise: ind variable {{{1
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131 " search previous item not in current line
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132 let p_semicol_l = MetaSearchNoncomment(end_of_item,"bW")
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133 while p_semicol_l == cl
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134 let p_semicol_l = MetaSearchNoncomment(end_of_item,"bW")
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135 endwhile
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136 " if this is first item in program use zero indent
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137 if !p_semicol_l
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138 return 0
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139 endif
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140 " if this is multiline item, remember first indent
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141 if MetaNextNonblankNoncomment(p_semicol_l+1) < cl
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142 let ind = indent(MetaNextNonblankNoncomment(p_semicol_l+1))
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143 " else --- search pre-previous item for search first line in previous item
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144 else
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145 " search pre-previous item not in current line
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146 let pp_semicol_l = MetaSearchNoncomment(end_of_item,"bW")
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147 while pp_semicol_l == p_semicol_l
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148 let pp_semicol_l = MetaSearchNoncomment(end_of_item,"bW")
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149 endwhile
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150 " if we find pre-previous item, remember indent of previous item
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151 " else --- remember zero
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152 if pp_semicol_l
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153 let ind = indent(MetaNextNonblankNoncomment(line(".")+1))
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154 else
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155 let ind = 0
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156 endif
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157 endif
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158 " }}}
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159 " Increase Indent: {{{1
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160 " if it is an internal/external :for or :if statements {{{2
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161 let pnn_s = getline(MetaPrevNonblankNoncomment(cl-1))
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162 if pnn_s =~ '\<\(for\|if\)\>.\+:\s*\($\|%\)'
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163 let ind = match(pnn_s, '\<\(for\|if\)\>.\+:\s*\($\|%\)') + &sw
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164 " }}}
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165 " if it is a :def, :vardef, :beginfig, :begingroup, :else, :elseif {{{2
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166 elseif pnn_s =~ '^\s*\(' .
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167 \ '\(var\)\=def\|' .
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168 \ 'begin\(group\|fig\s*(\s*\d\+\s*)\)\|' .
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169 \ 'else\(if\)\=' . '\)\>'
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170 let ind = ind + &sw
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171 " }}}
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172 " if it is a broken line {{{2
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173 elseif pnn_s !~ end_of_item.'\s*\($\|%\)'
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174 let ind = ind + (2 * &sw)
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175 endif
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176 " }}}
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177 " }}}
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178 " Decrease Indent: {{{1
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179 " if this is :endfor or :enddef statements {{{2
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180 " this is correct because :def cannot be inside :for
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181 if cs =~ '\<end\(for\|def\)\=\>'
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182 call MetaSearchNoncomment('\<for\>.\+:\s*\($\|%\)' . '\|' .
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183 \ '^\s*\(var\)\=def\>',"bW")
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184 if col(".") > 1
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185 let ind = col(".") - 1
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186 else
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187 let ind = indent(".")
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188 endif
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189 " }}}
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190 " if this is :fi, :else, :elseif statements {{{2
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191 elseif cs =~ '\<\(else\(if\)\=\|fi\)\>'
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192 call MetaSearchNoncomment('\<if\>.\+:\s*\($\|%\)',"bW")
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193 let ind = col(".") - 1
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194 " }}}
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195 " if this is :endgroup statement {{{2
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196 elseif cs =~ '^\s*endgroup\>'
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197 let ind = ind - &sw
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198 endif
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199 " }}}
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200 " }}}
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201
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202 return ind
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203 endfunction
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204 "
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205
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206 " vim:sw=2:fdm=marker
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