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1 " Vim indent file
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2 " Language: OCaml
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3 " Maintainers: Jean-Francois Yuen <jfyuen@ifrance.com>
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4 " Mike Leary <leary@nwlink.com>
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5 " Markus Mottl <markus@oefai.at>
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6 " URL: http://www.oefai.at/~markus/vim/indent/ocaml.vim
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7 " Last Change: 2003 Apr 14
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8 " 2003 Mar 05 - Added '{<' and some fixes (JY)
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9 " 2002 Nov 06 - Some fixes (JY)
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10
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11 " Only load this indent file when no other was loaded.
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12 if exists("b:did_indent")
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13 finish
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14 endif
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15 let b:did_indent = 1
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16
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17 setlocal expandtab
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18 setlocal indentexpr=GetOCamlIndent()
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19 setlocal indentkeys+=0=and,0=constraint,0=done,0=else,0=end,0=exception,0=external,0=if,0=in,0=include,0=inherit,0=initializer,0=let,0=method,0=open,0=then,0=type,0=val,0=with,0=;;,0=>\],0=\|\],0=\|,0=*),0=>},0},0\],0)
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20 setlocal nolisp
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21 setlocal nosmartindent
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22 setlocal textwidth=80
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23
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24 " Comment formatting
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25 if (has("comments"))
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26 setlocal comments=sr:(*,mb:*,ex:*)
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27 setlocal fo=cqort
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28 endif
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29
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30 " Only define the function once.
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31 if exists("*GetOCamlIndent")
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32 finish
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33 endif
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34
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35 " Define some patterns:
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36 let s:beflet = '^\s*\(initializer\|method\|try\)\|\(\<\(begin\|do\|else\|in\|then\|try\)\|->\|;\|(\)\s*$'
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37 let s:letpat = '^\s*\(let\|type\|module\|class\|open\|exception\|val\|include\|external\)\>'
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38 let s:letlim = '\(\<\(sig\|struct\)\|;;\)\s*$'
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39 let s:lim = '^\s*\(exception\|external\|include\|let\|module\|open\|type\|val\)\>'
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40 let s:module = '\<\%(begin\|sig\|struct\|object\)\>'
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41 let s:obj = '^\s*\(constraint\|inherit\|initializer\|method\|val\)\>\|\<\(object\|object\s*(.*)\)\s*$'
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42 let s:type = '^\s*\%(let\|type\)\>.*='
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43 let s:val = '^\s*\(val\|external\)\>.*:'
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44
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45 " Skipping pattern, for comments
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46 function s:SkipPattern(lnum, pat)
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47 let def = prevnonblank(a:lnum - 1)
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48 while def > 0 && getline(def) =~ a:pat
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49 let def = prevnonblank(def - 1)
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50 endwhile
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51 return def
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52 endfunction
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53
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54 " Indent for ';;' to match multiple 'let'
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55 function s:GetInd(lnum, pat, lim)
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56 let llet = search(a:pat, 'bW')
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57 let old = indent(a:lnum)
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58 while llet > 0
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59 let old = indent(llet)
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60 let nb = s:SkipPattern(llet, '^\s*(\*.*\*)\s*$')
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61 if getline(nb) =~ a:lim
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62 return old
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63 endif
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64 let llet = search(a:pat, 'bW')
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65 endwhile
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66 return old
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67 endfunction
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68
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69 " Indent pairs
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70 function s:FindPair(pstart, pmid, pend)
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71 call search(a:pend, 'bW')
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72 return indent(searchpair(a:pstart, a:pmid, a:pend, 'bWn', 'synIDattr(synID(line("."), col("."), 0), "name") =~? "string\\|comment"'))
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73 endfunction
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74
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75 " Indent 'let'
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76 function s:FindLet(pstart, pmid, pend)
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77 call search(a:pend, 'bW')
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78 return indent(searchpair(a:pstart, a:pmid, a:pend, 'bWn', 'synIDattr(synID(line("."), col("."), 0), "name") =~? "string\\|comment" || getline(".") =~ "^\\s*let\\>.*=.*\\<in\\s*$" || getline(prevnonblank(".") - 1) =~ "^\\s*let\\>.*=\\s*$\\|" . s:beflet'))
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79 endfunction
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80
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81 function GetOCamlIndent()
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82 " Find a non-blank line above the current line.
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83 let lnum = prevnonblank(v:lnum - 1)
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84
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85 " At the start of the file use zero indent.
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86 if lnum == 0
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87 return 0
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88 endif
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89
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90 let ind = indent(lnum)
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91 let lline = getline(lnum)
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92
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93 " Return double 'shiftwidth' after lines matching:
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94 if lline =~ '^\s*|.*->\s*$'
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95 return ind + &sw + &sw
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96 endif
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97
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98 let line = getline(v:lnum)
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99
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100 " Indent if current line begins with 'end'
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101 " for 'sig', 'struct', 'object' and 'begin':
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102 if line =~ '^\s*end\>'
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103 return s:FindPair(s:module, '','\<end\>')
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104
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105 " Indent if current line begins with 'done' for 'do':
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106 elseif line =~ '^\s*done\>'
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107 return s:FindPair('\<do\>', '','\<done\>')
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108
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109 " Indent if current line begins with '}' or '>}':
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110 elseif line =~ '^\s*\(\|>\)}'
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111 return s:FindPair('{', '','}')
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112
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113 " Indent if current line begins with ']', '|]' or '>]':
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114 elseif line =~ '^\s*\(\||\|>\)\]'
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115 return s:FindPair('\[', '','\]')
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116
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117 " Indent if current line begins with ')':
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118 elseif line =~ '^\s*)'
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119 return s:FindPair('(', '',')')
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120
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121 " Indent if current line begins with 'let'
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122 " and last line does not begin with 'let' or end with 'in' or ';;':
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123 elseif line =~ '^\s*let\>'
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124 if lline !~ s:lim . '\|' . s:letlim . '\|' . s:beflet
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125 return s:FindLet(s:type, '','\<let\s*$')
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126 else return ind
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127 endif
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128
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129 " Indent if current line begins with 'type'
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130 " and last line does not end with 'and' or ';;':
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131 elseif line =~ '^\s*type\>'
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132 if lline !~ s:lim . '\|\<and\s*$\|' . s:letlim
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133 return s:FindLet(s:type, '','\<type\s*$')
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134 else return ind
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135 endif
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136
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137 " Indent for pattern matching:
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138 elseif line =~ '^\s*|'
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139 if lline !~ '^\s*\(|\|\(match\|with\|type\)\>\)\|\<\(function\|parser\|with\)\s*$'
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140 call search('|', 'bW')
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141 return indent(searchpair('^\s*\(type\|match\)\>\|\<\(with\|function\|parser\)\s*$', '', '|', 'bWn', 'synIDattr(synID(line("."), col("."), 0), "name") =~? "string\\|comment" || getline(".") =~ "\\[|\\||\\]" && getline(".") !~ "^\\s*|.*->"'))
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142 else return ind
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143 endif
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144
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145 " Indent if current line begins with ';;':
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146 elseif line =~ '^\s*;;'
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147 if lline !~ ';;\s*$'
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148 return s:GetInd(v:lnum, s:letpat, s:letlim)
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149 else return ind
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150 endif
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151
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152 " Indent if current line begins with 'in' and previous
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153 " line does not start with 'let' or 'and':
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154 elseif line =~ '^\s*in\>'
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155 if lline !~ '^\s*\(let\|and\)\>'
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156 return s:FindPair('\<let\>', '', '\<in\>')
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157 else return ind
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158 endif
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159
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160 " Indent if current line begins with 'else'
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161 " and previous line does not start with 'if', 'then' or 'else':
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162 elseif line =~ '^\s*else\>'
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163 if lline !~ '^\s*\(if\|else\|then\)\>'
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164 return s:FindPair('\<if\>', '', '\<else\>')
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165 else return ind
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166 endif
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167
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168 " Indent if current line begins with 'then'
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169 " and previous line does not start with 'if', 'then' or 'else':
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170 elseif line =~ '^\s*then\>'
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171 if lline !~ '^\s*\(if\|else\|then\)\>'
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172 return s:FindPair('\<if\>', '', '\<then\>')
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173 else return ind
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174 endif
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175
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176 " Subtract a 'shiftwidth' if current line begins with 'and' and previous
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177 " line does not start with 'let', 'and' or 'type' or end with 'end'
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178 " (for classes):
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179 elseif line =~ '^\s*and\>'
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180 if lline !~ '^\s*\(and\|let\|type\)\>\|\<end\s*$'
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181 return ind - &sw
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182 else return ind
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183 endif
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184
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185 " Indent if current line begins with 'with'
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186 " and previous line does not start with 'match' or 'try':
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187 elseif line =~ '^\s*with\>'
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188 if lline !~ '^\s*\(match\|try\)\>'
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189 return s:FindPair('\<\%(match\|try\)\>', '','\<with\>')
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190 else return ind
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191 endif
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192
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193 " Indent if current line begins with 'exception':
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194 elseif line =~ '^\s*exception\>'
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195 if lline !~ s:lim . '\|' . s:letlim
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196 return indent(search(s:val . '\|^\s*\(external\|include\|open\|type\)\>', 'bW'))
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197 else return ind
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198 endif
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199
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200 " Indent if current line begins with 'external':
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201 elseif line =~ '^\s*external\>'
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202 if lline !~ s:lim . '\|' . s:letlim
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203 return indent(search(s:val . '\|^\s*\(exception\|include\|open\|type\)\>', 'bW'))
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204 else return ind
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205 endif
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206
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207 " Indent if current line begins with 'include':
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208 elseif line =~ '^\s*include\>'
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209 if lline !~ s:lim . '\|' . s:letlim
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210 return indent(search(s:val . '\|^\s*\(exception\|external\|open\|type\)\>', 'bW'))
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211 else return ind
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212 endif
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213
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214 " Indent if current line begins with 'open':
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215 elseif line =~ '^\s*open\>'
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216 if lline !~ s:lim . '\|' . s:letlim
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217 return indent(search(s:val . '\|^\s*\(exception\|external\|include\|type\)\>', 'bW'))
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218 else return ind
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219 endif
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220
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221 " Indent if current line begins with 'val':
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222 elseif line =~ '^\s*val\>'
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223 if lline !~ '^\s*\(exception\|external\|include\|open\)\>\|' . s:obj . '\|' . s:letlim
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224 return indent(search(s:val . '\|^\s*\(exception\|include\|initializer\|method\|open\|type\)\>', 'bW'))
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225 else return ind
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226 endif
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227
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228 " Indent if current line begins with 'constraint':
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229 elseif line =~ '^\s*constraint\>'
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230 if lline !~ s:obj
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231 return indent(search('^\s*\(inherit\|initializer\|method\|val\)\>', 'bW'))
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232 else return ind
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233 endif
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234
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235 " Indent if current line begins with 'inherit':
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236 elseif line =~ '^\s*inherit\>'
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237 if lline !~ s:obj
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238 return indent(search('^\s*\(constraint\|initializer\|method\|val\)\>', 'bW'))
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239 else return ind
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240 endif
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241
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242 " Indent if current line begins with 'inherit':
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243 elseif line =~ '^\s*initializer\>'
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244 if lline !~ s:obj
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245 return indent(search('^\s*\(constraint\|inherit\|method\|val\)\>', 'bW'))
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246 else return ind
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247 endif
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248
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249 " Indent if current line begins with 'method':
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250 elseif line =~ '^\s*method\>'
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251 if lline !~ s:obj
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252 return indent(search('^\s*\(\(constraint\|inherit\|initializer\|val\)\>\|method\>.*\(:\|=\)\)', 'bW'))
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253 else return ind
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254 endif
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255
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256 " Indent back to normal after comments:
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257 elseif line =~ '^\s*\*)'
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258 call search('\*)', 'bW')
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259 return indent(searchpair('(\*', '', '\*)', 'bWn', 'synIDattr(synID(line("."), col("."), 0), "name") =~? "string"'))
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260
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261 endif
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262
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263 " Add a 'shiftwidth' after lines ending with:
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264 if lline =~ '\(:\|=\|->\|<-\|(\|\[\|{\|{<\|\[|\|\[<\|\<\(begin\|struct\|sig\|functor\|initializer\|object\|try\|do\|if\|then\|else\|fun\|function\|parser\)\|\<object\s*(.*)\)\s*$'
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265 let ind = ind + &sw
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266
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267 " Back to normal indent after lines ending with ';;':
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268 elseif lline =~ ';;\s*$' && lline !~ '^\s*;;'
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269 let ind = s:GetInd(v:lnum, s:letpat, s:letlim)
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270
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271 " Back to normal indent after lines ending with 'end':
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272 elseif lline =~ '\<end\s*$'
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273 let ind = s:FindPair(s:module, '','\<end\>')
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274
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275 " Back to normal indent after lines ending with 'in':
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276 elseif lline =~ '\<in\s*$' && lline !~ '^\s*in\>'
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277 let ind = s:FindPair('\<let\>', '', '\<in\>')
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278
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279 " Back to normal indent after lines ending with 'done':
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280 elseif lline =~ '\<done\s*$'
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281 let ind = s:FindPair('\<do\>', '','\<done\>')
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282
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283 " Back to normal indent after lines ending with '}' or '>}':
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284 elseif lline =~ '\(\|>\)}\s*$'
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285 let ind = s:FindPair('{', '','}')
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286
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287 " Back to normal indent after lines ending with ']', '|]' or '>]':
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288 elseif lline =~ '\(\||\|>\)\]\s*$'
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289 let ind = s:FindPair('\[', '','\]')
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290
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291 " Back to normal indent after comments:
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292 elseif lline =~ '\*)\s*$'
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293 call search('\*)', 'bW')
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294 let ind = indent(searchpair('(\*', '', '\*)', 'bWn', 'synIDattr(synID(line("."), col("."), 0), "name") =~? "string"'))
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295
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296 " Back to normal indent after lines ending with ')':
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297 elseif lline =~ ')\s*$'
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298 let ind = s:FindPair('(', '',')')
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299
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300 endif
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301
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302 " Subtract a 'shiftwidth' after lines matching 'match ... with parser':
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303 if lline =~ '^\s*match\>.*\<with\>\s*\<parser\s*$'
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304 let ind = ind - &sw
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305 endif
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306
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307 return ind
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308
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309 endfunction
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310
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311 " vim:sw=2
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