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" Support for Python indenting, see runtime/indent/python.vim
let s:keepcpo= &cpo
set cpo&vim
" need to inspect some old g:pyindent_* variables to be backward compatible
let g:python_indent = extend(get(g:, 'python_indent', {}), #{
\ closed_paren_align_last_line: v:true,
\ open_paren: get(g:, 'pyindent_open_paren', 'shiftwidth() * 2'),
\ nested_paren: get(g:, 'pyindent_nested_paren', 'shiftwidth()'),
\ continue: get(g:, 'pyindent_continue', 'shiftwidth() * 2'),
"\ searchpair() can be slow, limit the time to 150 msec or what is put in
"\ g:python_indent.searchpair_timeout
\ searchpair_timeout: get(g:, 'pyindent_searchpair_timeout', 150),
"\ Identing inside parentheses can be very slow, regardless of the searchpair()
"\ timeout, so let the user disable this feature if he doesn't need it
\ disable_parentheses_indenting: get(g:, 'pyindent_disable_parentheses_indenting', v:false),
\ }, 'keep')
let s:maxoff = 50 " maximum number of lines to look backwards for ()
function s:SearchBracket(fromlnum, flags)
return searchpairpos('[[({]', '', '[])}]', a:flags,
\ {-> synstack('.', col('.'))
\ ->indexof({_, id -> synIDattr(id, 'name') =~ '\%(Comment\|Todo\|String\)$'}) >= 0},
\ [0, a:fromlnum - s:maxoff]->max(), g:python_indent.searchpair_timeout)
endfunction
" See if the specified line is already user-dedented from the expected value.
function s:Dedented(lnum, expected)
return indent(a:lnum) <= a:expected - shiftwidth()
endfunction
" Some other filetypes which embed Python have slightly different indent
" rules (e.g. bitbake). Those filetypes can pass an extra funcref to this
" function which is evaluated below.
function python#GetIndent(lnum, ...)
let ExtraFunc = a:0 > 0 ? a:1 : 0
" If this line is explicitly joined: If the previous line was also joined,
" line it up with that one, otherwise add two 'shiftwidth'
if getline(a:lnum - 1) =~ '\\$'
if a:lnum > 1 && getline(a:lnum - 2) =~ '\\$'
return indent(a:lnum - 1)
endif
return indent(a:lnum - 1) + get(g:, 'pyindent_continue', g:python_indent.continue)->eval()
endif
" If the start of the line is in a string don't change the indent.
if has('syntax_items')
\ && synIDattr(synID(a:lnum, 1, 1), "name") =~ "String$"
return -1
endif
" Search backwards for the previous non-empty line.
let plnum = prevnonblank(v:lnum - 1)
if plnum == 0
" This is the first non-empty line, use zero indent.
return 0
endif
if g:python_indent.disable_parentheses_indenting == 1
let plindent = indent(plnum)
let plnumstart = plnum
else
" Indent inside parens.
" Align with the open paren unless it is at the end of the line.
" E.g.
" open_paren_not_at_EOL(100,
" (200,
" 300),
" 400)
" open_paren_at_EOL(
" 100, 200, 300, 400)
call cursor(a:lnum, 1)
let [parlnum, parcol] = s:SearchBracket(a:lnum, 'nbW')
if parlnum > 0
if parcol != col([parlnum, '$']) - 1
return parcol
elseif getline(a:lnum) =~ '^\s*[])}]' && !g:python_indent.closed_paren_align_last_line
return indent(parlnum)
endif
endif
call cursor(plnum, 1)
" If the previous line is inside parenthesis, use the indent of the starting
" line.
let [parlnum, _] = s:SearchBracket(plnum, 'nbW')
if parlnum > 0
if a:0 > 0 && ExtraFunc(parlnum)
" We may have found the opening brace of a bitbake Python task, e.g. 'python do_task {'
" If so, ignore it here - it will be handled later.
let parlnum = 0
let plindent = indent(plnum)
let plnumstart = plnum
else
let plindent = indent(parlnum)
let plnumstart = parlnum
endif
else
let plindent = indent(plnum)
let plnumstart = plnum
endif
" When inside parenthesis: If at the first line below the parenthesis add
" two 'shiftwidth', otherwise same as previous line.
" i = (a
" + b
" + c)
call cursor(a:lnum, 1)
let [p, _] = s:SearchBracket(a:lnum, 'bW')
if p > 0
if a:0 > 0 && ExtraFunc(p)
" Currently only used by bitbake
" Handle first non-empty line inside a bitbake Python task
if p == plnum
return shiftwidth()
endif
" Handle the user actually trying to close a bitbake Python task
let line = getline(a:lnum)
if line =~ '^\s*}'
return -2
endif
" Otherwise ignore the brace
let p = 0
else
if p == plnum
" When the start is inside parenthesis, only indent one 'shiftwidth'.
let [pp, _] = s:SearchBracket(a:lnum, 'bW')
if pp > 0
return indent(plnum)
\ + get(g:, 'pyindent_nested_paren', g:python_indent.nested_paren)->eval()
endif
return indent(plnum)
\ + get(g:, 'pyindent_open_paren', g:python_indent.open_paren)->eval()
endif
if plnumstart == p
return indent(plnum)
endif
return plindent
endif
endif
endif
" Get the line and remove a trailing comment.
" Use syntax highlighting attributes when possible.
let pline = getline(plnum)
let pline_len = strlen(pline)
if has('syntax_items')
" If the last character in the line is a comment, do a binary search for
" the start of the comment. synID() is slow, a linear search would take
" too long on a long line.
if synstack(plnum, pline_len)
\ ->indexof({_, id -> synIDattr(id, 'name') =~ '\%(Comment\|Todo\)$'}) >= 0
let min = 1
let max = pline_len
while min < max
let col = (min + max) / 2
if synstack(plnum, col)
\ ->indexof({_, id -> synIDattr(id, 'name') =~ '\%(Comment\|Todo\)$'}) >= 0
let max = col
else
let min = col + 1
endif
endwhile
let pline = strpart(pline, 0, min - 1)
endif
else
let col = 0
while col < pline_len
if pline[col] == '#'
let pline = strpart(pline, 0, col)
break
endif
let col = col + 1
endwhile
endif
" If the previous line ended with a colon, indent this line
if pline =~ ':\s*$'
return plindent + shiftwidth()
endif
" If the previous line was a stop-execution statement...
if getline(plnum) =~ '^\s*\(break\|continue\|raise\|return\|pass\)\>'
" See if the user has already dedented
if s:Dedented(a:lnum, indent(plnum))
" If so, trust the user
return -1
endif
" If not, recommend one dedent
return indent(plnum) - shiftwidth()
endif
" If the current line begins with a keyword that lines up with "try"
if getline(a:lnum) =~ '^\s*\(except\|finally\)\>'
let lnum = a:lnum - 1
while lnum >= 1
if getline(lnum) =~ '^\s*\(try\|except\)\>'
let ind = indent(lnum)
if ind >= indent(a:lnum)
return -1 " indent is already less than this
endif
return ind " line up with previous try or except
endif
let lnum = lnum - 1
endwhile
return -1 " no matching "try"!
endif
" If the current line begins with a header keyword, dedent
if getline(a:lnum) =~ '^\s*\(elif\|else\)\>'
" Unless the previous line was a one-liner
if getline(plnumstart) =~ '^\s*\(for\|if\|elif\|try\)\>'
return plindent
endif
" Or the user has already dedented
if s:Dedented(a:lnum, plindent)
return -1
endif
return plindent - shiftwidth()
endif
" When after a () construct we probably want to go back to the start line.
" a = (b
" + c)
" here
if parlnum > 0
" ...unless the user has already dedented
if s:Dedented(a:lnum, plindent)
return -1
else
return plindent
endif
endif
return -1
endfunction
let &cpo = s:keepcpo
unlet s:keepcpo