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1 " Vim indent file
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2 " Language: Falcon
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3 " Maintainer: Steven Oliver <oliver.steven@gmail.com>
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4 " Website: https://steveno@github.com/steveno/falconpl-vim.git
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5 " Credits: This is, to a great extent, a copy n' paste of ruby.vim.
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6
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7 " 1. Setup {{{1
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8 " ============
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9
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10 " Only load this indent file when no other was loaded.
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11 if exists("b:did_indent")
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12 finish
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13 endif
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14 let b:did_indent = 1
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15
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16 setlocal nosmartindent
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17
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18 " Setup indent function and when to use it
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19 setlocal indentexpr=FalconGetIndent(v:lnum)
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20 setlocal indentkeys=0{,0},0),0],!^F,o,O,e
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21 setlocal indentkeys+==~case,=~catch,=~default,=~elif,=~else,=~end,=~\"
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22
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23 " Define the appropriate indent function but only once
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24 if exists("*FalconGetIndent")
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25 finish
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26 endif
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27
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28 let s:cpo_save = &cpo
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29 set cpo&vim
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30
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31 " 2. Variables {{{1
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32 " ============
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33
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34 " Regex of syntax group names that are strings AND comments
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35 let s:syng_strcom = '\<falcon\%(String\|StringEscape\|Comment\)\>'
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36
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37 " Regex of syntax group names that are strings
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38 let s:syng_string = '\<falcon\%(String\|StringEscape\)\>'
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39
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40 " Regex that defines blocks.
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41 "
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42 " Note that there's a slight problem with this regex and s:continuation_regex.
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43 " Code like this will be matched by both:
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44 "
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45 " method_call do |(a, b)|
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46 "
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47 " The reason is that the pipe matches a hanging "|" operator.
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48 "
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49 let s:block_regex =
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50 \ '\%(\<do:\@!\>\|%\@<!{\)\s*\%(|\s*(*\s*\%([*@&]\=\h\w*,\=\s*\)\%(,\s*(*\s*[*@&]\=\h\w*\s*)*\s*\)*|\)\=\s*\%(#.*\)\=$'
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51
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52 let s:block_continuation_regex = '^\s*[^])}\t ].*'.s:block_regex
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53
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54 " Regex that defines continuation lines.
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55 " TODO: this needs to deal with if ...: and so on
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56 let s:continuation_regex =
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57 \ '\%(%\@<![({[\\.,:*/%+]\|\<and\|\<or\|\%(<%\)\@<![=-]\|\W[|&?]\|||\|&&\)\s*\%(#.*\)\=$'
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58
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59 " Regex that defines bracket continuations
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60 let s:bracket_continuation_regex = '%\@<!\%([({[]\)\s*\%(#.*\)\=$'
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61
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62 " Regex that defines continuation lines, not including (, {, or [.
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63 let s:non_bracket_continuation_regex = '\%([\\.,:*/%+]\|\<and\|\<or\|\%(<%\)\@<![=-]\|\W[|&?]\|||\|&&\)\s*\%(#.*\)\=$'
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64
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65 " Keywords to indent on
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66 let s:falcon_indent_keywords = '^\s*\(case\|catch\|class\|enum\|default\|elif\|else' .
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67 \ '\|for\|function\|if.*"[^"]*:.*"\|if \(\(:\)\@!.\)*$\|loop\|object\|select' .
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68 \ '\|switch\|try\|while\|\w*\s*=\s*\w*([$\)'
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69
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70 " Keywords to deindent on
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71 let s:falcon_deindent_keywords = '^\s*\(case\|catch\|default\|elif\|else\|end\)'
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72
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73 " 3. Functions {{{1
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74 " ============
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75
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76 " Check if the character at lnum:col is inside a string, comment, or is ascii.
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77 function s:IsInStringOrComment(lnum, col)
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78 return synIDattr(synID(a:lnum, a:col, 1), 'name') =~ s:syng_strcom
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79 endfunction
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80
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81 " Check if the character at lnum:col is inside a string.
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82 function s:IsInString(lnum, col)
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83 return synIDattr(synID(a:lnum, a:col, 1), 'name') =~ s:syng_string
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84 endfunction
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85
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86 " Check if the character at lnum:col is inside a string delimiter
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87 function s:IsInStringDelimiter(lnum, col)
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88 return synIDattr(synID(a:lnum, a:col, 1), 'name') == 'falconStringDelimiter'
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89 endfunction
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90
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91 " Find line above 'lnum' that isn't empty, in a comment, or in a string.
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92 function s:PrevNonBlankNonString(lnum)
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93 let in_block = 0
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94 let lnum = prevnonblank(a:lnum)
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95 while lnum > 0
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96 " Go in and out of blocks comments as necessary.
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97 " If the line isn't empty (with opt. comment) or in a string, end search.
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98 let line = getline(lnum)
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99 if line =~ '^=begin'
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100 if in_block
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101 let in_block = 0
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102 else
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103 break
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104 endif
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105 elseif !in_block && line =~ '^=end'
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106 let in_block = 1
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107 elseif !in_block && line !~ '^\s*#.*$' && !(s:IsInStringOrComment(lnum, 1)
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108 \ && s:IsInStringOrComment(lnum, strlen(line)))
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109 break
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110 endif
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111 let lnum = prevnonblank(lnum - 1)
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112 endwhile
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113 return lnum
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114 endfunction
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115
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116 " Find line above 'lnum' that started the continuation 'lnum' may be part of.
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117 function s:GetMSL(lnum)
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118 " Start on the line we're at and use its indent.
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119 let msl = a:lnum
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120 let msl_body = getline(msl)
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121 let lnum = s:PrevNonBlankNonString(a:lnum - 1)
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122 while lnum > 0
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123 " If we have a continuation line, or we're in a string, use line as MSL.
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124 " Otherwise, terminate search as we have found our MSL already.
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125 let line = getline(lnum)
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126
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127 if s:Match(line, s:non_bracket_continuation_regex) &&
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128 \ s:Match(msl, s:non_bracket_continuation_regex)
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129 " If the current line is a non-bracket continuation and so is the
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130 " previous one, keep its indent and continue looking for an MSL.
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131 "
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132 " Example:
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133 " method_call one,
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134 " two,
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135 " three
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136 "
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137 let msl = lnum
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138 elseif s:Match(lnum, s:non_bracket_continuation_regex) &&
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139 \ (s:Match(msl, s:bracket_continuation_regex) || s:Match(msl, s:block_continuation_regex))
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140 " If the current line is a bracket continuation or a block-starter, but
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141 " the previous is a non-bracket one, respect the previous' indentation,
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142 " and stop here.
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143 "
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144 " Example:
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145 " method_call one,
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146 " two {
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147 " three
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148 "
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149 return lnum
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150 elseif s:Match(lnum, s:bracket_continuation_regex) &&
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151 \ (s:Match(msl, s:bracket_continuation_regex) || s:Match(msl, s:block_continuation_regex))
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152 " If both lines are bracket continuations (the current may also be a
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153 " block-starter), use the current one's and stop here
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154 "
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155 " Example:
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156 " method_call(
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157 " other_method_call(
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158 " foo
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159 return msl
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160 elseif s:Match(lnum, s:block_regex) &&
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161 \ !s:Match(msl, s:continuation_regex) &&
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162 \ !s:Match(msl, s:block_continuation_regex)
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163 " If the previous line is a block-starter and the current one is
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164 " mostly ordinary, use the current one as the MSL.
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165 "
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166 " Example:
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167 " method_call do
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168 " something
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169 " something_else
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170 return msl
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171 else
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172 let col = match(line, s:continuation_regex) + 1
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173 if (col > 0 && !s:IsInStringOrComment(lnum, col))
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174 \ || s:IsInString(lnum, strlen(line))
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175 let msl = lnum
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176 else
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177 break
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178 endif
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179 endif
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180
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181 let msl_body = getline(msl)
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182 let lnum = s:PrevNonBlankNonString(lnum - 1)
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183 endwhile
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184 return msl
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185 endfunction
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186
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187 " Check if line 'lnum' has more opening brackets than closing ones.
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188 function s:ExtraBrackets(lnum)
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189 let opening = {'parentheses': [], 'braces': [], 'brackets': []}
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190 let closing = {'parentheses': [], 'braces': [], 'brackets': []}
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191
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192 let line = getline(a:lnum)
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193 let pos = match(line, '[][(){}]', 0)
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194
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195 " Save any encountered opening brackets, and remove them once a matching
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196 " closing one has been found. If a closing bracket shows up that doesn't
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197 " close anything, save it for later.
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198 while pos != -1
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199 if !s:IsInStringOrComment(a:lnum, pos + 1)
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200 if line[pos] == '('
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201 call add(opening.parentheses, {'type': '(', 'pos': pos})
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202 elseif line[pos] == ')'
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203 if empty(opening.parentheses)
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204 call add(closing.parentheses, {'type': ')', 'pos': pos})
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205 else
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206 let opening.parentheses = opening.parentheses[0:-2]
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207 endif
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208 elseif line[pos] == '{'
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209 call add(opening.braces, {'type': '{', 'pos': pos})
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210 elseif line[pos] == '}'
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211 if empty(opening.braces)
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212 call add(closing.braces, {'type': '}', 'pos': pos})
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213 else
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214 let opening.braces = opening.braces[0:-2]
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215 endif
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216 elseif line[pos] == '['
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217 call add(opening.brackets, {'type': '[', 'pos': pos})
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218 elseif line[pos] == ']'
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219 if empty(opening.brackets)
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220 call add(closing.brackets, {'type': ']', 'pos': pos})
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221 else
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222 let opening.brackets = opening.brackets[0:-2]
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223 endif
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224 endif
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225 endif
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226
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227 let pos = match(line, '[][(){}]', pos + 1)
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228 endwhile
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229
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230 " Find the rightmost brackets, since they're the ones that are important in
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231 " both opening and closing cases
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232 let rightmost_opening = {'type': '(', 'pos': -1}
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233 let rightmost_closing = {'type': ')', 'pos': -1}
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234
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235 for opening in opening.parentheses + opening.braces + opening.brackets
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236 if opening.pos > rightmost_opening.pos
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237 let rightmost_opening = opening
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238 endif
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239 endfor
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240
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241 for closing in closing.parentheses + closing.braces + closing.brackets
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242 if closing.pos > rightmost_closing.pos
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243 let rightmost_closing = closing
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244 endif
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245 endfor
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246
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247 return [rightmost_opening, rightmost_closing]
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248 endfunction
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249
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250 function s:Match(lnum, regex)
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251 let col = match(getline(a:lnum), '\C'.a:regex) + 1
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252 return col > 0 && !s:IsInStringOrComment(a:lnum, col) ? col : 0
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253 endfunction
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254
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255 function s:MatchLast(lnum, regex)
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256 let line = getline(a:lnum)
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257 let col = match(line, '.*\zs' . a:regex)
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258 while col != -1 && s:IsInStringOrComment(a:lnum, col)
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259 let line = strpart(line, 0, col)
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260 let col = match(line, '.*' . a:regex)
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261 endwhile
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262 return col + 1
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263 endfunction
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264
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265 " 4. FalconGetIndent Routine {{{1
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266 " ============
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267
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268 function FalconGetIndent(...)
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269 " For the current line, use the first argument if given, else v:lnum
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270 let clnum = a:0 ? a:1 : v:lnum
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271
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272 " Use zero indent at the top of the file
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273 if clnum == 0
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274 return 0
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275 endif
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276
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277 let line = getline(clnum)
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278 let ind = -1
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279
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280 " If we got a closing bracket on an empty line, find its match and indent
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281 " according to it. For parentheses we indent to its column - 1, for the
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282 " others we indent to the containing line's MSL's level. Return -1 if fail.
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283 let col = matchend(line, '^\s*[]})]')
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284 if col > 0 && !s:IsInStringOrComment(clnum, col)
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285 call cursor(clnum, col)
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286 let bs = strpart('(){}[]', stridx(')}]', line[col - 1]) * 2, 2)
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287 if searchpair(escape(bs[0], '\['), '', bs[1], 'bW', s:skip_expr) > 0
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288 if line[col-1]==')' && col('.') != col('$') - 1
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289 let ind = virtcol('.') - 1
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290 else
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291 let ind = indent(s:GetMSL(line('.')))
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292 endif
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293 endif
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294 return ind
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295 endif
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296
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297 " If we have a deindenting keyword, find its match and indent to its level.
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298 " TODO: this is messy
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299 if s:Match(clnum, s:falcon_deindent_keywords)
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300 call cursor(clnum, 1)
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301 if searchpair(s:end_start_regex, s:end_middle_regex, s:end_end_regex, 'bW',
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302 \ s:end_skip_expr) > 0
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303 let msl = s:GetMSL(line('.'))
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304 let line = getline(line('.'))
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305
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306 if strpart(line, 0, col('.') - 1) =~ '=\s*$' &&
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307 \ strpart(line, col('.') - 1, 2) !~ 'do'
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308 let ind = virtcol('.') - 1
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309 elseif getline(msl) =~ '=\s*\(#.*\)\=$'
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310 let ind = indent(line('.'))
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311 else
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312 let ind = indent(msl)
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313 endif
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314 endif
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315 return ind
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316 endif
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317
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318 " If we are in a multi-line string or line-comment, don't do anything to it.
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319 if s:IsInString(clnum, matchend(line, '^\s*') + 1)
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320 return indent('.')
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321 endif
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322
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323 " Find a non-blank, non-multi-line string line above the current line.
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324 let lnum = s:PrevNonBlankNonString(clnum - 1)
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325
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326 " If the line is empty and inside a string, use the previous line.
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327 if line =~ '^\s*$' && lnum != prevnonblank(clnum - 1)
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328 return indent(prevnonblank(clnum))
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329 endif
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330
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331 " At the start of the file use zero indent.
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332 if lnum == 0
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333 return 0
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334 endif
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335
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336 " Set up variables for the previous line.
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337 let line = getline(lnum)
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338 let ind = indent(lnum)
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339
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340 " If the previous line ended with a block opening, add a level of indent.
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341 if s:Match(lnum, s:block_regex)
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342 return indent(s:GetMSL(lnum)) + shiftwidth()
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343 endif
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344
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345 " If it contained hanging closing brackets, find the rightmost one, find its
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346 " match and indent according to that.
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347 if line =~ '[[({]' || line =~ '[])}]\s*\%(#.*\)\=$'
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348 let [opening, closing] = s:ExtraBrackets(lnum)
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349
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350 if opening.pos != -1
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351 if opening.type == '(' && searchpair('(', '', ')', 'bW', s:skip_expr) > 0
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352 if col('.') + 1 == col('$')
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353 return ind + shiftwidth()
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354 else
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355 return virtcol('.')
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356 endif
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357 else
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358 let nonspace = matchend(line, '\S', opening.pos + 1) - 1
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359 return nonspace > 0 ? nonspace : ind + shiftwidth()
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360 endif
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361 elseif closing.pos != -1
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362 call cursor(lnum, closing.pos + 1)
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363 normal! %
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364
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365 if s:Match(line('.'), s:falcon_indent_keywords)
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366 return indent('.') + shiftwidth()
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367 else
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368 return indent('.')
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369 endif
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370 else
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371 call cursor(clnum, 0) " FIXME: column was vcol
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372 end
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2596
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373 endif
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374
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4869
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375 " If the previous line ended with an "end", match that "end"s beginning's
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376 " indent.
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377 let col = s:Match(lnum, '\%(^\|[^.:@$]\)\<end\>\s*\%(#.*\)\=$')
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378 if col > 0
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379 call cursor(lnum, col)
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380 if searchpair(s:end_start_regex, '', s:end_end_regex, 'bW',
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381 \ s:end_skip_expr) > 0
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382 let n = line('.')
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383 let ind = indent('.')
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384 let msl = s:GetMSL(n)
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385 if msl != n
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386 let ind = indent(msl)
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387 end
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388 return ind
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389 endif
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390 end
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2596
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391
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4869
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392 let col = s:Match(lnum, s:falcon_indent_keywords)
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393 if col > 0
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394 call cursor(lnum, col)
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11518
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395 let ind = virtcol('.') - 1 + shiftwidth()
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4869
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396 " TODO: make this better (we need to count them) (or, if a searchpair
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397 " fails, we know that something is lacking an end and thus we indent a
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398 " level
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399 if s:Match(lnum, s:end_end_regex)
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400 let ind = indent('.')
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401 endif
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402 return ind
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2596
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403 endif
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404
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4869
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405 " Set up variables to use and search for MSL to the previous line.
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406 let p_lnum = lnum
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407 let lnum = s:GetMSL(lnum)
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408
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409 " If the previous line wasn't a MSL and is continuation return its indent.
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410 " TODO: the || s:IsInString() thing worries me a bit.
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411 if p_lnum != lnum
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412 if s:Match(p_lnum, s:non_bracket_continuation_regex) || s:IsInString(p_lnum,strlen(line))
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413 return ind
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414 endif
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2596
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415 endif
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416
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4869
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417 " Set up more variables, now that we know we wasn't continuation bound.
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418 let line = getline(lnum)
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419 let msl_ind = indent(lnum)
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420
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421 " If the MSL line had an indenting keyword in it, add a level of indent.
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422 " TODO: this does not take into account contrived things such as
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423 " module Foo; class Bar; end
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424 if s:Match(lnum, s:falcon_indent_keywords)
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11518
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425 let ind = msl_ind + shiftwidth()
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4869
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426 if s:Match(lnum, s:end_end_regex)
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11518
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427 let ind = ind - shiftwidth()
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4869
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428 endif
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429 return ind
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2596
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430 endif
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431
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4869
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432 " If the previous line ended with [*+/.,-=], but wasn't a block ending or a
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433 " closing bracket, indent one extra level.
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434 if s:Match(lnum, s:non_bracket_continuation_regex) && !s:Match(lnum, '^\s*\([\])}]\|end\)')
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435 if lnum == p_lnum
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11518
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436 let ind = msl_ind + shiftwidth()
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4869
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437 else
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438 let ind = msl_ind
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439 endif
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440 return ind
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441 endif
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442
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443 return ind
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2596
|
444 endfunction
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445
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4869
|
446 " }}}1
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447
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3224
|
448 let &cpo = s:cpo_save
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449 unlet s:cpo_save
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450
|
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2596
|
451 " vim: set sw=4 sts=4 et tw=80 :
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