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532
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1 " Vim indent file
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2 " Language: SML
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3 " Maintainer: Saikat Guha <sg266@cornell.edu>
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4 " Hubert Chao <hc85@cornell.edu>
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5 " Original OCaml Version:
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6 " Jean-Francois Yuen <jfyuen@ifrance.com>
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7 " Mike Leary <leary@nwlink.com>
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8 " Markus Mottl <markus@oefai.at>
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9 " OCaml URL: http://www.oefai.at/~markus/vim/indent/ocaml.vim
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10 " Last Change: 2003 Jan 04 - Adapted to SML
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11 " 2002 Nov 06 - Some fixes (JY)
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12 " 2002 Oct 28 - Fixed bug with indentation of ']' (MM)
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13 " 2002 Oct 22 - Major rewrite (JY)
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14
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15 " Only load this indent file when no other was loaded.
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16 if exists("b:did_indent")
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17 finish
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18 endif
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19 let b:did_indent = 1
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20
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21 setlocal expandtab
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22 setlocal indentexpr=GetSMLIndent()
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23 setlocal indentkeys+=0=and,0=else,0=end,0=handle,0=if,0=in,0=let,0=then,0=val,0=fun,0=\|,0=*),0)
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24 setlocal nolisp
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25 setlocal nosmartindent
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26 setlocal textwidth=80
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27 setlocal shiftwidth=2
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28
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29 " Comment formatting
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30 if (has("comments"))
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31 set comments=sr:(*,mb:*,ex:*)
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32 set fo=cqort
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33 endif
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34
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35 " Only define the function once.
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36 "if exists("*GetSMLIndent")
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37 "finish
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38 "endif
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39
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40 " Define some patterns:
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41 let s:beflet = '^\s*\(initializer\|method\|try\)\|\(\<\(begin\|do\|else\|in\|then\|try\)\|->\|;\)\s*$'
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42 let s:letpat = '^\s*\(let\|type\|module\|class\|open\|exception\|val\|include\|external\)\>'
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43 let s:letlim = '\(\<\(sig\|struct\)\|;;\)\s*$'
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44 let s:lim = '^\s*\(exception\|external\|include\|let\|module\|open\|type\|val\)\>'
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45 let s:module = '\<\%(let\|sig\|struct\)\>'
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46 let s:obj = '^\s*\(constraint\|inherit\|initializer\|method\|val\)\>\|\<\(object\|object\s*(.*)\)\s*$'
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47 let s:type = '^\s*\%(let\|type\)\>.*='
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48 let s:val = '^\s*\(val\|external\)\>.*:'
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49
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50 " Skipping pattern, for comments
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51 function! s:SkipPattern(lnum, pat)
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52 let def = prevnonblank(a:lnum - 1)
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53 while def > 0 && getline(def) =~ a:pat
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54 let def = prevnonblank(def - 1)
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55 endwhile
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56 return def
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57 endfunction
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58
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59 " Indent for ';;' to match multiple 'let'
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60 function! s:GetInd(lnum, pat, lim)
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61 let llet = search(a:pat, 'bW')
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62 let old = indent(a:lnum)
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63 while llet > 0
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64 let old = indent(llet)
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65 let nb = s:SkipPattern(llet, '^\s*(\*.*\*)\s*$')
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66 if getline(nb) =~ a:lim
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67 return old
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68 endif
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69 let llet = search(a:pat, 'bW')
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70 endwhile
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71 return old
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72 endfunction
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73
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74 " Indent pairs
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75 function! s:FindPair(pstart, pmid, pend)
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76 call search(a:pend, 'bW')
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77 " return indent(searchpair(a:pstart, a:pmid, a:pend, 'bWn', 'synIDattr(synID(line("."), col("."), 0), "name") =~? "string\\|comment"'))
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78 let lno = searchpair(a:pstart, a:pmid, a:pend, 'bW', 'synIDattr(synID(line("."), col("."), 0), "name") =~? "string\\|comment"')
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79 if lno == -1
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80 return indent(lno)
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81 else
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82 return col(".") - 1
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83 endif
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84 endfunction
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85
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86 function! s:FindLet(pstart, pmid, pend)
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87 call search(a:pend, 'bW')
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88 " return indent(searchpair(a:pstart, a:pmid, a:pend, 'bWn', 'synIDattr(synID(line("."), col("."), 0), "name") =~? "string\\|comment"'))
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89 let lno = searchpair(a:pstart, a:pmid, a:pend, 'bW', 'synIDattr(synID(line("."), col("."), 0), "name") =~? "string\\|comment"')
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90 let moduleLine = getline(lno)
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91 if lno == -1 || moduleLine =~ '^\s*\(fun\|structure\|signature\)\>'
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92 return indent(lno)
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93 else
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94 return col(".") - 1
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95 endif
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96 endfunction
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97
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98 " Indent 'let'
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99 "function! s:FindLet(pstart, pmid, pend)
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100 " call search(a:pend, 'bW')
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101 " 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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102 "endfunction
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103
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104 function! GetSMLIndent()
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105 " Find a non-blank line above the current line.
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106 let lnum = prevnonblank(v:lnum - 1)
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107
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108 " At the start of the file use zero indent.
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109 if lnum == 0
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110 return 0
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111 endif
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112
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113 let ind = indent(lnum)
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114 let lline = getline(lnum)
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115
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116 " Return double 'shiftwidth' after lines matching:
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117 if lline =~ '^\s*|.*=>\s*$'
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11518
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118 return ind + 2 *shiftwidth()
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532
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119 elseif lline =~ '^\s*val\>.*=\s*$'
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11518
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120 return ind + shiftwidth()
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532
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121 endif
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122
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123 let line = getline(v:lnum)
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124
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125 " Indent lines starting with 'end' to matching module
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126 if line =~ '^\s*end\>'
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127 return s:FindLet(s:module, '', '\<end\>')
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128
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129 " Match 'else' with 'if'
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130 elseif line =~ '^\s*else\>'
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131 if lline !~ '^\s*\(if\|else\|then\)\>'
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132 return s:FindPair('\<if\>', '', '\<then\>')
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839
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133 else
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134 return ind
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532
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135 endif
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136
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137 " Match 'then' with 'if'
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138 elseif line =~ '^\s*then\>'
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139 if lline !~ '^\s*\(if\|else\|then\)\>'
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140 return s:FindPair('\<if\>', '', '\<then\>')
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839
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141 else
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142 return ind
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532
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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 return s:FindPair('\[','','\]')
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148
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149 " Indent current line starting with 'in' to last matching 'let'
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150 elseif line =~ '^\s*in\>'
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151 let ind = s:FindLet('\<let\>','','\<in\>')
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152
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153 " Indent from last matching module if line matches:
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154 elseif line =~ '^\s*\(fun\|val\|open\|structure\|and\|datatype\|type\|exception\)\>'
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155 cursor(lnum,1)
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156 let lastModule = indent(searchpair(s:module, '', '\<end\>', 'bWn', 'synIDattr(synID(line("."), col("."), 0), "name") =~? "string\\|comment"'))
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157 if lastModule == -1
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158 return 0
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159 else
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11518
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160 return lastModule + shiftwidth()
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532
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161 endif
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162
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163 " Indent lines starting with '|' from matching 'case', 'handle'
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164 elseif line =~ '^\s*|'
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165 " cursor(lnum,1)
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166 let lastSwitch = search('\<\(case\|handle\|fun\|datatype\)\>','bW')
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167 let switchLine = getline(lastSwitch)
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168 let switchLineIndent = indent(lastSwitch)
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169 if lline =~ '^\s*|'
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170 return ind
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171 endif
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172 if switchLine =~ '\<case\>'
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173 return col(".") + 2
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174 elseif switchLine =~ '\<handle\>'
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11518
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175 return switchLineIndent + shiftwidth()
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532
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176 elseif switchLine =~ '\<datatype\>'
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177 call search('=')
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178 return col(".") - 1
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179 else
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180 return switchLineIndent + 2
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181 endif
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182
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183
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184 " Indent if last line ends with 'sig', 'struct', 'let', 'then', 'else',
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185 " 'in'
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186 elseif lline =~ '\<\(sig\|struct\|let\|in\|then\|else\)\s*$'
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11518
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187 let ind = ind + shiftwidth()
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532
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188
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189 " Indent if last line ends with 'of', align from 'case'
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190 elseif lline =~ '\<\(of\)\s*$'
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191 call search('\<case\>',"bW")
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192 let ind = col(".")+4
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193
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194 " Indent if current line starts with 'of'
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195 elseif line =~ '^\s*of\>'
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196 call search('\<case\>',"bW")
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197 let ind = col(".")+1
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198
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199
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200 " Indent if last line starts with 'fun', 'case', 'fn'
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201 elseif lline =~ '^\s*\(fun\|fn\|case\)\>'
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11518
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202 let ind = ind + shiftwidth()
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532
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203
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204 endif
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205
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206 " Don't indent 'let' if last line started with 'fun', 'fn'
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207 if line =~ '^\s*let\>'
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208 if lline =~ '^\s*\(fun\|fn\)'
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11518
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209 let ind = ind - shiftwidth()
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532
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210 endif
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211 endif
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212
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213 return ind
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214
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215 endfunction
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216
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217 " vim:sw=2
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