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1 " Vim indent file
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2 " Language: Ruby
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3 " Maintainer: Nikolai Weibull <now at bitwi.se>
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4 " URL: https://github.com/vim-ruby/vim-ruby
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5 " Release Coordinator: Doug Kearns <dougkearns@gmail.com>
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6
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7 " 0. Initialization {{{1
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8 " =================
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7
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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 " Now, set up our indentation expression and keys that trigger it.
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19 setlocal indentexpr=GetRubyIndent(v:lnum)
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20 setlocal indentkeys=0{,0},0),0],!^F,o,O,e
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21 setlocal indentkeys+==end,=else,=elsif,=when,=ensure,=rescue,==begin,==end
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22
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23 " Only define the function once.
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24 if exists("*GetRubyIndent")
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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 " 1. Variables {{{1
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32 " ============
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33
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34 " Regex of syntax group names that are or delimit strings/symbols or are comments.
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35 let s:syng_strcom = '\<ruby\%(Regexp\|RegexpDelimiter\|RegexpEscape' .
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36 \ '\|Symbol\|String\|StringDelimiter\|StringEscape\|ASCIICode' .
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37 \ '\|Interpolation\|NoInterpolation\|Comment\|Documentation\)\>'
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38
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39 " Regex of syntax group names that are strings.
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40 let s:syng_string =
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41 \ '\<ruby\%(String\|Interpolation\|NoInterpolation\|StringEscape\)\>'
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42
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43 " Regex of syntax group names that are strings or documentation.
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44 let s:syng_stringdoc =
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45 \'\<ruby\%(String\|Interpolation\|NoInterpolation\|StringEscape\|Documentation\)\>'
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46
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47 " Expression used to check whether we should skip a match with searchpair().
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48 let s:skip_expr =
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49 \ "synIDattr(synID(line('.'),col('.'),1),'name') =~ '".s:syng_strcom."'"
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50
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51 " Regex used for words that, at the start of a line, add a level of indent.
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52 let s:ruby_indent_keywords = '^\s*\zs\<\%(module\|class\|def\|if\|for' .
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53 \ '\|while\|until\|else\|elsif\|case\|when\|unless\|begin\|ensure' .
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54 \ '\|rescue\):\@!\>' .
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55 \ '\|\%([=,*/%+-]\|<<\|>>\|:\s\)\s*\zs' .
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56 \ '\<\%(if\|for\|while\|until\|case\|unless\|begin\):\@!\>'
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57
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58 " Regex used for words that, at the start of a line, remove a level of indent.
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59 let s:ruby_deindent_keywords =
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60 \ '^\s*\zs\<\%(ensure\|else\|rescue\|elsif\|when\|end\):\@!\>'
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61
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62 " Regex that defines the start-match for the 'end' keyword.
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63 "let s:end_start_regex = '\%(^\|[^.]\)\<\%(module\|class\|def\|if\|for\|while\|until\|case\|unless\|begin\|do\)\>'
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64 " TODO: the do here should be restricted somewhat (only at end of line)?
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65 let s:end_start_regex =
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66 \ '\C\%(^\s*\|[=,*/%+\-|;{]\|<<\|>>\|:\s\)\s*\zs' .
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67 \ '\<\%(module\|class\|def\|if\|for\|while\|until\|case\|unless\|begin\):\@!\>' .
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68 \ '\|\%(^\|[^.:@$]\)\@<=\<do:\@!\>'
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69
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70 " Regex that defines the middle-match for the 'end' keyword.
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71 let s:end_middle_regex = '\<\%(ensure\|else\|\%(\%(^\|;\)\s*\)\@<=\<rescue:\@!\>\|when\|elsif\):\@!\>'
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72
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73 " Regex that defines the end-match for the 'end' keyword.
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74 let s:end_end_regex = '\%(^\|[^.:@$]\)\@<=\<end:\@!\>'
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75
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76 " Expression used for searchpair() call for finding match for 'end' keyword.
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77 let s:end_skip_expr = s:skip_expr .
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78 \ ' || (expand("<cword>") == "do"' .
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79 \ ' && getline(".") =~ "^\\s*\\<\\(while\\|until\\|for\\):\\@!\\>")'
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80
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81 " Regex that defines continuation lines, not including (, {, or [.
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82 let s:non_bracket_continuation_regex = '\%([\\.,:*/%+]\|\<and\|\<or\|\%(<%\)\@<![=-]\|\W[|&?]\|||\|&&\)\s*\%(#.*\)\=$'
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83
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84 " Regex that defines continuation lines.
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85 " TODO: this needs to deal with if ...: and so on
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86 let s:continuation_regex =
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87 \ '\%(%\@<![({[\\.,:*/%+]\|\<and\|\<or\|\%(<%\)\@<![=-]\|\W[|&?]\|||\|&&\)\s*\%(#.*\)\=$'
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88
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89 " Regex that defines bracket continuations
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90 let s:bracket_continuation_regex = '%\@<!\%([({[]\)\s*\%(#.*\)\=$'
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91
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92 " Regex that defines the first part of a splat pattern
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93 let s:splat_regex = '[[,(]\s*\*\s*\%(#.*\)\=$'
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94
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95 " Regex that defines blocks.
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96 "
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97 " Note that there's a slight problem with this regex and s:continuation_regex.
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98 " Code like this will be matched by both:
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99 "
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100 " method_call do |(a, b)|
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101 "
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102 " The reason is that the pipe matches a hanging "|" operator.
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103 "
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104 let s:block_regex =
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105 \ '\%(\<do:\@!\>\|%\@<!{\)\s*\%(|\s*(*\s*\%([*@&]\=\h\w*,\=\s*\)\%(,\s*(*\s*[*@&]\=\h\w*\s*)*\s*\)*|\)\=\s*\%(#.*\)\=$'
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106
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107 let s:block_continuation_regex = '^\s*[^])}\t ].*'.s:block_regex
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108
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109 " 2. Auxiliary Functions {{{1
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110 " ======================
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111
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112 " Check if the character at lnum:col is inside a string, comment, or is ascii.
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113 function s:IsInStringOrComment(lnum, col)
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114 return synIDattr(synID(a:lnum, a:col, 1), 'name') =~ s:syng_strcom
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115 endfunction
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116
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117 " Check if the character at lnum:col is inside a string.
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118 function s:IsInString(lnum, col)
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119 return synIDattr(synID(a:lnum, a:col, 1), 'name') =~ s:syng_string
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120 endfunction
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121
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122 " Check if the character at lnum:col is inside a string or documentation.
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123 function s:IsInStringOrDocumentation(lnum, col)
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124 return synIDattr(synID(a:lnum, a:col, 1), 'name') =~ s:syng_stringdoc
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125 endfunction
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126
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127 " Check if the character at lnum:col is inside a string delimiter
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128 function s:IsInStringDelimiter(lnum, col)
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129 return synIDattr(synID(a:lnum, a:col, 1), 'name') == 'rubyStringDelimiter'
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130 endfunction
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131
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132 " Find line above 'lnum' that isn't empty, in a comment, or in a string.
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133 function s:PrevNonBlankNonString(lnum)
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134 let in_block = 0
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135 let lnum = prevnonblank(a:lnum)
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136 while lnum > 0
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137 " Go in and out of blocks comments as necessary.
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138 " If the line isn't empty (with opt. comment) or in a string, end search.
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139 let line = getline(lnum)
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140 if line =~ '^=begin'
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141 if in_block
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142 let in_block = 0
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143 else
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144 break
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145 endif
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146 elseif !in_block && line =~ '^=end'
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147 let in_block = 1
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148 elseif !in_block && line !~ '^\s*#.*$' && !(s:IsInStringOrComment(lnum, 1)
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149 \ && s:IsInStringOrComment(lnum, strlen(line)))
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150 break
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151 endif
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152 let lnum = prevnonblank(lnum - 1)
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153 endwhile
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154 return lnum
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155 endfunction
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156
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157 " Find line above 'lnum' that started the continuation 'lnum' may be part of.
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158 function s:GetMSL(lnum)
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159 " Start on the line we're at and use its indent.
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160 let msl = a:lnum
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161 let msl_body = getline(msl)
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162 let lnum = s:PrevNonBlankNonString(a:lnum - 1)
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163 while lnum > 0
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164 " If we have a continuation line, or we're in a string, use line as MSL.
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165 " Otherwise, terminate search as we have found our MSL already.
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166 let line = getline(lnum)
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167
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168 if s:Match(lnum, s:splat_regex)
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169 " If the above line looks like the "*" of a splat, use the current one's
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170 " indentation.
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171 "
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172 " Example:
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173 " Hash[*
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174 " method_call do
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175 " something
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176 "
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177 return msl
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178 elseif s:Match(line, s:non_bracket_continuation_regex) &&
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179 \ s:Match(msl, s:non_bracket_continuation_regex)
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180 " If the current line is a non-bracket continuation and so is the
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181 " previous one, keep its indent and continue looking for an MSL.
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182 "
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183 " Example:
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184 " method_call one,
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185 " two,
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186 " three
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187 "
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188 let msl = lnum
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189 elseif s:Match(lnum, s:non_bracket_continuation_regex) &&
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190 \ (s:Match(msl, s:bracket_continuation_regex) || s:Match(msl, s:block_continuation_regex))
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191 " If the current line is a bracket continuation or a block-starter, but
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192 " the previous is a non-bracket one, respect the previous' indentation,
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193 " and stop here.
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194 "
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195 " Example:
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196 " method_call one,
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197 " two {
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198 " three
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199 "
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200 return lnum
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201 elseif s:Match(lnum, s:bracket_continuation_regex) &&
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202 \ (s:Match(msl, s:bracket_continuation_regex) || s:Match(msl, s:block_continuation_regex))
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203 " If both lines are bracket continuations (the current may also be a
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204 " block-starter), use the current one's and stop here
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205 "
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206 " Example:
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207 " method_call(
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208 " other_method_call(
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209 " foo
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210 return msl
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211 elseif s:Match(lnum, s:block_regex) &&
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212 \ !s:Match(msl, s:continuation_regex) &&
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213 \ !s:Match(msl, s:block_continuation_regex)
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214 " If the previous line is a block-starter and the current one is
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215 " mostly ordinary, use the current one as the MSL.
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216 "
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217 " Example:
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218 " method_call do
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219 " something
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220 " something_else
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221 return msl
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222 else
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223 let col = match(line, s:continuation_regex) + 1
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224 if (col > 0 && !s:IsInStringOrComment(lnum, col))
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225 \ || s:IsInString(lnum, strlen(line))
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226 let msl = lnum
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227 else
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228 break
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229 endif
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230 endif
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231
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232 let msl_body = getline(msl)
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233 let lnum = s:PrevNonBlankNonString(lnum - 1)
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234 endwhile
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235 return msl
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236 endfunction
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237
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238 " Check if line 'lnum' has more opening brackets than closing ones.
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239 function s:ExtraBrackets(lnum)
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240 let opening = {'parentheses': [], 'braces': [], 'brackets': []}
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241 let closing = {'parentheses': [], 'braces': [], 'brackets': []}
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242
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243 let line = getline(a:lnum)
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244 let pos = match(line, '[][(){}]', 0)
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245
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246 " Save any encountered opening brackets, and remove them once a matching
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247 " closing one has been found. If a closing bracket shows up that doesn't
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248 " close anything, save it for later.
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249 while pos != -1
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250 if !s:IsInStringOrComment(a:lnum, pos + 1)
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251 if line[pos] == '('
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252 call add(opening.parentheses, {'type': '(', 'pos': pos})
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253 elseif line[pos] == ')'
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254 if empty(opening.parentheses)
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255 call add(closing.parentheses, {'type': ')', 'pos': pos})
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256 else
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257 let opening.parentheses = opening.parentheses[0:-2]
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258 endif
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259 elseif line[pos] == '{'
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260 call add(opening.braces, {'type': '{', 'pos': pos})
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261 elseif line[pos] == '}'
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262 if empty(opening.braces)
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263 call add(closing.braces, {'type': '}', 'pos': pos})
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264 else
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265 let opening.braces = opening.braces[0:-2]
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266 endif
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267 elseif line[pos] == '['
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268 call add(opening.brackets, {'type': '[', 'pos': pos})
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269 elseif line[pos] == ']'
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270 if empty(opening.brackets)
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271 call add(closing.brackets, {'type': ']', 'pos': pos})
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272 else
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273 let opening.brackets = opening.brackets[0:-2]
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274 endif
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275 endif
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276 endif
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277
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278 let pos = match(line, '[][(){}]', pos + 1)
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279 endwhile
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280
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281 " Find the rightmost brackets, since they're the ones that are important in
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282 " both opening and closing cases
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283 let rightmost_opening = {'type': '(', 'pos': -1}
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284 let rightmost_closing = {'type': ')', 'pos': -1}
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285
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286 for opening in opening.parentheses + opening.braces + opening.brackets
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287 if opening.pos > rightmost_opening.pos
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288 let rightmost_opening = opening
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289 endif
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290 endfor
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291
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292 for closing in closing.parentheses + closing.braces + closing.brackets
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293 if closing.pos > rightmost_closing.pos
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294 let rightmost_closing = closing
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295 endif
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296 endfor
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297
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298 return [rightmost_opening, rightmost_closing]
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299 endfunction
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300
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301 function s:Match(lnum, regex)
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302 let col = match(getline(a:lnum), '\C'.a:regex) + 1
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303 return col > 0 && !s:IsInStringOrComment(a:lnum, col) ? col : 0
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304 endfunction
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305
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306 function s:MatchLast(lnum, regex)
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307 let line = getline(a:lnum)
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308 let col = match(line, '.*\zs' . a:regex)
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309 while col != -1 && s:IsInStringOrComment(a:lnum, col)
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310 let line = strpart(line, 0, col)
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311 let col = match(line, '.*' . a:regex)
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312 endwhile
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313 return col + 1
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314 endfunction
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315
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316 " 3. GetRubyIndent Function {{{1
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317 " =========================
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318
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319 function GetRubyIndent(...)
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320 " 3.1. Setup {{{2
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321 " ----------
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322
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323 " For the current line, use the first argument if given, else v:lnum
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324 let clnum = a:0 ? a:1 : v:lnum
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325
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326 " Set up variables for restoring position in file. Could use clnum here.
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327 let vcol = col('.')
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328
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329 " 3.2. Work on the current line {{{2
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330 " -----------------------------
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331
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332 " Get the current line.
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333 let line = getline(clnum)
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334 let ind = -1
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335
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336 " If we got a closing bracket on an empty line, find its match and indent
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337 " according to it. For parentheses we indent to its column - 1, for the
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338 " others we indent to the containing line's MSL's level. Return -1 if fail.
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339 let col = matchend(line, '^\s*[]})]')
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340 if col > 0 && !s:IsInStringOrComment(clnum, col)
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341 call cursor(clnum, col)
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342 let bs = strpart('(){}[]', stridx(')}]', line[col - 1]) * 2, 2)
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343 if searchpair(escape(bs[0], '\['), '', bs[1], 'bW', s:skip_expr) > 0
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344 if line[col-1]==')' && col('.') != col('$') - 1
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345 let ind = virtcol('.') - 1
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346 else
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347 let ind = indent(s:GetMSL(line('.')))
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348 endif
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349 endif
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350 return ind
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351 endif
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352
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353 " If we have a =begin or =end set indent to first column.
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354 if match(line, '^\s*\%(=begin\|=end\)$') != -1
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355 return 0
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356 endif
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357
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358 " If we have a deindenting keyword, find its match and indent to its level.
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359 " TODO: this is messy
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4869
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360 if s:Match(clnum, s:ruby_deindent_keywords)
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361 call cursor(clnum, 1)
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530
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362 if searchpair(s:end_start_regex, s:end_middle_regex, s:end_end_regex, 'bW',
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4869
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363 \ s:end_skip_expr) > 0
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364 let msl = s:GetMSL(line('.'))
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365 let line = getline(line('.'))
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366
|
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532
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367 if strpart(line, 0, col('.') - 1) =~ '=\s*$' &&
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4869
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368 \ strpart(line, col('.') - 1, 2) !~ 'do'
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369 let ind = virtcol('.') - 1
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370 elseif getline(msl) =~ '=\s*\(#.*\)\=$'
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371 let ind = indent(line('.'))
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530
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372 else
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4869
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373 let ind = indent(msl)
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530
|
374 endif
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375 endif
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376 return ind
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377 endif
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378
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379 " If we are in a multi-line string or line-comment, don't do anything to it.
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4869
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380 if s:IsInStringOrDocumentation(clnum, matchend(line, '^\s*') + 1)
|
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530
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381 return indent('.')
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382 endif
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383
|
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4869
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384 " If we are at the closing delimiter of a "<<" heredoc-style string, set the
|
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385 " indent to 0.
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386 if line =~ '^\k\+\s*$'
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387 \ && s:IsInStringDelimiter(clnum, 1)
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388 \ && search('\V<<'.line, 'nbW') > 0
|
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389 return 0
|
|
|
390 endif
|
|
|
391
|
|
530
|
392 " 3.3. Work on the previous line. {{{2
|
|
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393 " -------------------------------
|
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394
|
|
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395 " Find a non-blank, non-multi-line string line above the current line.
|
|
4869
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396 let lnum = s:PrevNonBlankNonString(clnum - 1)
|
|
7
|
397
|
|
1668
|
398 " If the line is empty and inside a string, use the previous line.
|
|
4869
|
399 if line =~ '^\s*$' && lnum != prevnonblank(clnum - 1)
|
|
|
400 return indent(prevnonblank(clnum))
|
|
1668
|
401 endif
|
|
|
402
|
|
7
|
403 " At the start of the file use zero indent.
|
|
|
404 if lnum == 0
|
|
|
405 return 0
|
|
|
406 endif
|
|
|
407
|
|
4869
|
408 " Set up variables for the previous line.
|
|
530
|
409 let line = getline(lnum)
|
|
|
410 let ind = indent(lnum)
|
|
|
411
|
|
|
412 " If the previous line ended with a block opening, add a level of indent.
|
|
|
413 if s:Match(lnum, s:block_regex)
|
|
|
414 return indent(s:GetMSL(lnum)) + &sw
|
|
|
415 endif
|
|
|
416
|
|
4869
|
417 " If the previous line ended with the "*" of a splat, add a level of indent
|
|
|
418 if line =~ s:splat_regex
|
|
|
419 return indent(lnum) + &sw
|
|
|
420 endif
|
|
|
421
|
|
|
422 " If the previous line contained unclosed opening brackets and we are still
|
|
|
423 " in them, find the rightmost one and add indent depending on the bracket
|
|
|
424 " type.
|
|
|
425 "
|
|
|
426 " If it contained hanging closing brackets, find the rightmost one, find its
|
|
|
427 " match and indent according to that.
|
|
|
428 if line =~ '[[({]' || line =~ '[])}]\s*\%(#.*\)\=$'
|
|
|
429 let [opening, closing] = s:ExtraBrackets(lnum)
|
|
|
430
|
|
|
431 if opening.pos != -1
|
|
|
432 if opening.type == '(' && searchpair('(', '', ')', 'bW', s:skip_expr) > 0
|
|
|
433 if col('.') + 1 == col('$')
|
|
|
434 return ind + &sw
|
|
|
435 else
|
|
|
436 return virtcol('.')
|
|
|
437 endif
|
|
1121
|
438 else
|
|
4869
|
439 let nonspace = matchend(line, '\S', opening.pos + 1) - 1
|
|
|
440 return nonspace > 0 ? nonspace : ind + &sw
|
|
1121
|
441 endif
|
|
4869
|
442 elseif closing.pos != -1
|
|
|
443 call cursor(lnum, closing.pos + 1)
|
|
|
444 normal! %
|
|
|
445
|
|
|
446 if s:Match(line('.'), s:ruby_indent_keywords)
|
|
|
447 return indent('.') + &sw
|
|
|
448 else
|
|
|
449 return indent('.')
|
|
|
450 endif
|
|
530
|
451 else
|
|
4869
|
452 call cursor(clnum, vcol)
|
|
530
|
453 end
|
|
7
|
454 endif
|
|
|
455
|
|
530
|
456 " If the previous line ended with an "end", match that "end"s beginning's
|
|
|
457 " indent.
|
|
1212
|
458 let col = s:Match(lnum, '\%(^\|[^.:@$]\)\<end\>\s*\%(#.*\)\=$')
|
|
530
|
459 if col > 0
|
|
|
460 call cursor(lnum, col)
|
|
|
461 if searchpair(s:end_start_regex, '', s:end_end_regex, 'bW',
|
|
4869
|
462 \ s:end_skip_expr) > 0
|
|
530
|
463 let n = line('.')
|
|
|
464 let ind = indent('.')
|
|
|
465 let msl = s:GetMSL(n)
|
|
|
466 if msl != n
|
|
4869
|
467 let ind = indent(msl)
|
|
530
|
468 end
|
|
|
469 return ind
|
|
|
470 endif
|
|
|
471 end
|
|
|
472
|
|
|
473 let col = s:Match(lnum, s:ruby_indent_keywords)
|
|
|
474 if col > 0
|
|
|
475 call cursor(lnum, col)
|
|
|
476 let ind = virtcol('.') - 1 + &sw
|
|
|
477 " TODO: make this better (we need to count them) (or, if a searchpair
|
|
|
478 " fails, we know that something is lacking an end and thus we indent a
|
|
|
479 " level
|
|
|
480 if s:Match(lnum, s:end_end_regex)
|
|
|
481 let ind = indent('.')
|
|
|
482 endif
|
|
|
483 return ind
|
|
7
|
484 endif
|
|
|
485
|
|
530
|
486 " 3.4. Work on the MSL line. {{{2
|
|
|
487 " --------------------------
|
|
|
488
|
|
|
489 " Set up variables to use and search for MSL to the previous line.
|
|
|
490 let p_lnum = lnum
|
|
|
491 let lnum = s:GetMSL(lnum)
|
|
|
492
|
|
|
493 " If the previous line wasn't a MSL and is continuation return its indent.
|
|
|
494 " TODO: the || s:IsInString() thing worries me a bit.
|
|
|
495 if p_lnum != lnum
|
|
4869
|
496 if s:Match(p_lnum, s:non_bracket_continuation_regex) || s:IsInString(p_lnum,strlen(line))
|
|
530
|
497 return ind
|
|
|
498 endif
|
|
7
|
499 endif
|
|
|
500
|
|
530
|
501 " Set up more variables, now that we know we wasn't continuation bound.
|
|
|
502 let line = getline(lnum)
|
|
|
503 let msl_ind = indent(lnum)
|
|
|
504
|
|
|
505 " If the MSL line had an indenting keyword in it, add a level of indent.
|
|
|
506 " TODO: this does not take into account contrived things such as
|
|
|
507 " module Foo; class Bar; end
|
|
|
508 if s:Match(lnum, s:ruby_indent_keywords)
|
|
|
509 let ind = msl_ind + &sw
|
|
|
510 if s:Match(lnum, s:end_end_regex)
|
|
|
511 let ind = ind - &sw
|
|
|
512 endif
|
|
|
513 return ind
|
|
7
|
514 endif
|
|
|
515
|
|
4869
|
516 " If the previous line ended with [*+/.,-=], but wasn't a block ending or a
|
|
|
517 " closing bracket, indent one extra level.
|
|
|
518 if s:Match(lnum, s:non_bracket_continuation_regex) && !s:Match(lnum, '^\s*\([\])}]\|end\)')
|
|
530
|
519 if lnum == p_lnum
|
|
|
520 let ind = msl_ind + &sw
|
|
|
521 else
|
|
|
522 let ind = msl_ind
|
|
|
523 endif
|
|
4869
|
524 return ind
|
|
530
|
525 endif
|
|
|
526
|
|
|
527 " }}}2
|
|
|
528
|
|
7
|
529 return ind
|
|
|
530 endfunction
|
|
|
531
|
|
530
|
532 " }}}1
|
|
|
533
|
|
|
534 let &cpo = s:cpo_save
|
|
|
535 unlet s:cpo_save
|
|
1121
|
536
|
|
4869
|
537 " vim:set sw=2 sts=2 ts=8 et:
|
