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29450
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1 " Support for Python indenting, see runtime/indent/python.vim
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2
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3 let s:keepcpo= &cpo
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4 set cpo&vim
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5
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29840
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6 " need to inspect some old g:pyindent_* variables to be backward compatible
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7 let g:python_indent = extend(get(g:, 'python_indent', {}), #{
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8 \ closed_paren_align_last_line: v:true,
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9 \ open_paren: get(g:, 'pyindent_open_paren', 'shiftwidth() * 2'),
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10 \ nested_paren: get(g:, 'pyindent_nested_paren', 'shiftwidth()'),
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11 \ continue: get(g:, 'pyindent_continue', 'shiftwidth() * 2'),
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12 "\ searchpair() can be slow, limit the time to 150 msec or what is put in
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13 "\ g:python_indent.searchpair_timeout
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14 \ searchpair_timeout: get(g:, 'pyindent_searchpair_timeout', 150),
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15 "\ Identing inside parentheses can be very slow, regardless of the searchpair()
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16 "\ timeout, so let the user disable this feature if he doesn't need it
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17 \ disable_parentheses_indenting: get(g:, 'pyindent_disable_parentheses_indenting', v:false),
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18 \ }, 'keep')
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29659
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19
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20 let s:maxoff = 50 " maximum number of lines to look backwards for ()
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21
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22 function s:SearchBracket(fromlnum, flags)
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23 return searchpairpos('[[({]', '', '[])}]', a:flags,
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29779
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24 \ {-> synstack('.', col('.'))
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25 \ ->map({_, id -> id->synIDattr('name')})
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26 \ ->match('\%(Comment\|Todo\|String\)$') >= 0},
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29840
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27 \ [0, a:fromlnum - s:maxoff]->max(), g:python_indent.searchpair_timeout)
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29659
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28 endfunction
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29
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29450
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30 " See if the specified line is already user-dedented from the expected value.
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31 function s:Dedented(lnum, expected)
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32 return indent(a:lnum) <= a:expected - shiftwidth()
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33 endfunction
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34
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35 " Some other filetypes which embed Python have slightly different indent
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36 " rules (e.g. bitbake). Those filetypes can pass an extra funcref to this
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37 " function which is evaluated below.
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38 function python#GetIndent(lnum, ...)
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39 let ExtraFunc = a:0 > 0 ? a:1 : 0
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40
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41 " If this line is explicitly joined: If the previous line was also joined,
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42 " line it up with that one, otherwise add two 'shiftwidth'
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43 if getline(a:lnum - 1) =~ '\\$'
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44 if a:lnum > 1 && getline(a:lnum - 2) =~ '\\$'
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45 return indent(a:lnum - 1)
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46 endif
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29840
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47 return indent(a:lnum - 1) + get(g:, 'pyindent_continue', g:python_indent.continue)->eval()
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29450
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48 endif
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49
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50 " If the start of the line is in a string don't change the indent.
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51 if has('syntax_items')
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52 \ && synIDattr(synID(a:lnum, 1, 1), "name") =~ "String$"
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53 return -1
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54 endif
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55
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56 " Search backwards for the previous non-empty line.
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57 let plnum = prevnonblank(v:lnum - 1)
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58
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59 if plnum == 0
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60 " This is the first non-empty line, use zero indent.
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61 return 0
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62 endif
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63
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29840
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64 if g:python_indent.disable_parentheses_indenting == 1
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29450
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65 let plindent = indent(plnum)
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66 let plnumstart = plnum
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67 else
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29659
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68 " Indent inside parens.
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69 " Align with the open paren unless it is at the end of the line.
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70 " E.g.
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71 " open_paren_not_at_EOL(100,
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72 " (200,
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73 " 300),
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74 " 400)
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75 " open_paren_at_EOL(
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76 " 100, 200, 300, 400)
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77 call cursor(a:lnum, 1)
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78 let [parlnum, parcol] = s:SearchBracket(a:lnum, 'nbW')
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29840
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79 if parlnum > 0
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80 if parcol != col([parlnum, '$']) - 1
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81 return parcol
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82 elseif getline(a:lnum) =~ '^\s*[])}]' && !g:python_indent.closed_paren_align_last_line
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83 return indent(parlnum)
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84 endif
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29659
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85 endif
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86
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87 call cursor(plnum, 1)
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29450
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88
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89 " If the previous line is inside parenthesis, use the indent of the starting
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90 " line.
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29659
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91 let [parlnum, _] = s:SearchBracket(plnum, 'nbW')
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29450
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92 if parlnum > 0
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93 if a:0 > 0 && ExtraFunc(parlnum)
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94 " We may have found the opening brace of a bitbake Python task, e.g. 'python do_task {'
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95 " If so, ignore it here - it will be handled later.
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96 let parlnum = 0
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97 let plindent = indent(plnum)
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98 let plnumstart = plnum
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99 else
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100 let plindent = indent(parlnum)
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101 let plnumstart = parlnum
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102 endif
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103 else
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104 let plindent = indent(plnum)
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105 let plnumstart = plnum
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106 endif
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107
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108 " When inside parenthesis: If at the first line below the parenthesis add
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109 " two 'shiftwidth', otherwise same as previous line.
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110 " i = (a
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111 " + b
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112 " + c)
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113 call cursor(a:lnum, 1)
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29659
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114 let [p, _] = s:SearchBracket(a:lnum, 'bW')
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29450
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115 if p > 0
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116 if a:0 > 0 && ExtraFunc(p)
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117 " Currently only used by bitbake
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118 " Handle first non-empty line inside a bitbake Python task
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119 if p == plnum
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120 return shiftwidth()
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121 endif
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122
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123 " Handle the user actually trying to close a bitbake Python task
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124 let line = getline(a:lnum)
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125 if line =~ '^\s*}'
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126 return -2
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127 endif
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128
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129 " Otherwise ignore the brace
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130 let p = 0
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131 else
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132 if p == plnum
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133 " When the start is inside parenthesis, only indent one 'shiftwidth'.
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29659
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134 let [pp, _] = s:SearchBracket(a:lnum, 'bW')
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29450
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135 if pp > 0
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29840
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136 return indent(plnum)
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137 \ + get(g:, 'pyindent_nested_paren', g:python_indent.nested_paren)->eval()
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29450
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138 endif
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29840
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139 return indent(plnum)
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140 \ + get(g:, 'pyindent_open_paren', g:python_indent.open_paren)->eval()
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29450
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141 endif
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142 if plnumstart == p
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143 return indent(plnum)
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144 endif
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145 return plindent
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146 endif
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147 endif
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148 endif
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149
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150
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151 " Get the line and remove a trailing comment.
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152 " Use syntax highlighting attributes when possible.
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153 let pline = getline(plnum)
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154 let pline_len = strlen(pline)
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155 if has('syntax_items')
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156 " If the last character in the line is a comment, do a binary search for
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157 " the start of the comment. synID() is slow, a linear search would take
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158 " too long on a long line.
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29779
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159 if synstack(plnum, pline_len)
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160 \ ->map({_, id -> id->synIDattr('name')})
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161 \ ->match('\%(Comment\|Todo\)$') >= 0
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29450
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162 let min = 1
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163 let max = pline_len
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164 while min < max
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165 let col = (min + max) / 2
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29779
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166 if synstack(plnum, col)
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167 \ ->map({_, id -> id->synIDattr('name')})
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168 \ ->match('\%(Comment\|Todo\)$') >= 0
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29450
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169 let max = col
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170 else
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171 let min = col + 1
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172 endif
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173 endwhile
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174 let pline = strpart(pline, 0, min - 1)
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175 endif
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176 else
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177 let col = 0
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178 while col < pline_len
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179 if pline[col] == '#'
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180 let pline = strpart(pline, 0, col)
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181 break
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182 endif
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183 let col = col + 1
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184 endwhile
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185 endif
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186
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187 " If the previous line ended with a colon, indent this line
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188 if pline =~ ':\s*$'
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189 return plindent + shiftwidth()
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190 endif
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191
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192 " If the previous line was a stop-execution statement...
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193 if getline(plnum) =~ '^\s*\(break\|continue\|raise\|return\|pass\)\>'
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194 " See if the user has already dedented
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195 if s:Dedented(a:lnum, indent(plnum))
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196 " If so, trust the user
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197 return -1
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198 endif
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199 " If not, recommend one dedent
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200 return indent(plnum) - shiftwidth()
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201 endif
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202
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203 " If the current line begins with a keyword that lines up with "try"
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204 if getline(a:lnum) =~ '^\s*\(except\|finally\)\>'
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205 let lnum = a:lnum - 1
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206 while lnum >= 1
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207 if getline(lnum) =~ '^\s*\(try\|except\)\>'
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208 let ind = indent(lnum)
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209 if ind >= indent(a:lnum)
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210 return -1 " indent is already less than this
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211 endif
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212 return ind " line up with previous try or except
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213 endif
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214 let lnum = lnum - 1
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215 endwhile
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216 return -1 " no matching "try"!
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217 endif
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218
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219 " If the current line begins with a header keyword, dedent
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220 if getline(a:lnum) =~ '^\s*\(elif\|else\)\>'
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221
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222 " Unless the previous line was a one-liner
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223 if getline(plnumstart) =~ '^\s*\(for\|if\|elif\|try\)\>'
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224 return plindent
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225 endif
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226
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227 " Or the user has already dedented
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228 if s:Dedented(a:lnum, plindent)
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229 return -1
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230 endif
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231
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232 return plindent - shiftwidth()
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233 endif
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234
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235 " When after a () construct we probably want to go back to the start line.
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236 " a = (b
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237 " + c)
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238 " here
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239 if parlnum > 0
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240 " ...unless the user has already dedented
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241 if s:Dedented(a:lnum, plindent)
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242 return -1
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243 else
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244 return plindent
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245 endif
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246 endif
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247
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248 return -1
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249 endfunction
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250
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251 let &cpo = s:keepcpo
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252 unlet s:keepcpo
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