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" PEP8 compatible Python indent file
" Language: Python
" Maintainer: Daniel Hahler <https://daniel.hahler.de/>
" Prev Maintainer: Hynek Schlawack <hs@ox.cx>
" Prev Maintainer: Eric Mc Sween <em@tomcom.de> (address invalid)
" Original Author: David Bustos <bustos@caltech.edu> (address invalid)
" License: CC0
"
" vim-python-pep8-indent - A nicer Python indentation style for vim.
" Written in 2004 by David Bustos <bustos@caltech.edu>
" Maintained from 2004-2005 by Eric Mc Sween <em@tomcom.de>
" Maintained from 2013 by Hynek Schlawack <hs@ox.cx>
" Maintained from 2017 by Daniel Hahler <https://daniel.hahler.de/>
"
" To the extent possible under law, the author(s) have dedicated all copyright
" and related and neighboring rights to this software to the public domain
" worldwide. This software is distributed without any warranty.
" You should have received a copy of the CC0 Public Domain Dedication along
" with this software. If not, see
" <http://creativecommons.org/publicdomain/zero/1.0/>.
" Only load this indent file when no other was loaded.
if exists('b:did_indent')
finish
endif
let b:did_indent = 1
setlocal nolisp
setlocal autoindent
setlocal indentexpr=GetPythonPEPIndent(v:lnum)
setlocal indentkeys=!^F,o,O,<:>,0),0],0},=elif,=except
if !exists('g:python_pep8_indent_multiline_string')
let g:python_pep8_indent_multiline_string = 0
endif
if !exists('g:python_pep8_indent_hang_closing')
let g:python_pep8_indent_hang_closing = 0
endif
" TODO: check required patch for timeout argument, likely lower than 7.3.429 though.
if !exists('g:python_pep8_indent_searchpair_timeout')
if has('patch-8.0.1483')
let g:python_pep8_indent_searchpair_timeout = 150
else
let g:python_pep8_indent_searchpair_timeout = 0
endif
endif
let s:block_rules = {
\ '^\s*elif\>': [['if', 'elif'], ['else']],
\ '^\s*except\>': [['try', 'except'], []],
\ '^\s*finally\>': [['try', 'except', 'else'], []]
\ }
let s:block_rules_multiple = {
\ '^\s*else\>': [['if', 'elif', 'for', 'try', 'except'], []]
\ }
" Pairs to look for when searching for opening parenthesis.
" The value is the maximum offset in lines.
let s:paren_pairs = {'()': 50, '[]': 100, '{}': 1000}
if &filetype ==# 'pyrex' || &filetype ==# 'cython'
let b:control_statement = '\v^\s*(class|def|if|while|with|for|except|cdef|cpdef)>'
else
let b:control_statement = '\v^\s*(class|def|if|while|with|for|except)>'
endif
let s:stop_statement = '^\s*\(break\|continue\|raise\|return\|pass\)\>'
let s:skip_after_opening_paren = 'synIDattr(synID(line("."), col("."), 0), "name") ' .
\ '=~? "\\vcomment|jedi\\S"'
let s:special_chars_syn_pattern = "\\vstring|comment|^pythonbytes%(contents)=$|pythonTodo|jedi\\S"
if !get(g:, 'python_pep8_indent_skip_concealed', 0) || !has('conceal')
" Skip strings and comments. Return 1 for chars to skip.
" jedi* refers to syntax definitions from jedi-vim for call signatures, which
" are inserted temporarily into the buffer.
function! s:_skip_special_chars(line, col)
return synIDattr(synID(a:line, a:col, 0), 'name')
\ =~? s:special_chars_syn_pattern
endfunction
else
" Also ignore anything concealed.
" TODO: doc; likely only necessary with jedi-vim, where a better version is
" planned (https://github.com/Vimjas/vim-python-pep8-indent/pull/98).
" Wrapper around synconcealed for older Vim (7.3.429, used on Travis CI).
function! s:is_concealed(line, col)
let concealed = synconcealed(a:line, a:col)
return len(concealed) && concealed[0]
endfunction
function! s:_skip_special_chars(line, col)
return synIDattr(synID(a:line, a:col, 0), 'name')
\ =~? s:special_chars_syn_pattern
\ || s:is_concealed(a:line, a:col)
endfunction
endif
" Use 'shiftwidth()' instead of '&sw'.
" (Since Vim patch 7.3.629, 'shiftwidth' can be set to 0 to follow 'tabstop').
if exists('*shiftwidth')
function! s:sw()
return shiftwidth()
endfunction
else
function! s:sw()
return &shiftwidth
endfunction
endif
" Find backwards the closest open parenthesis/bracket/brace.
function! s:find_opening_paren(lnum, col)
" Return if cursor is in a comment.
if synIDattr(synID(a:lnum, a:col, 0), 'name') =~? 'comment'
return [0, 0]
endif
call cursor(a:lnum, a:col)
let nearest = [0, 0]
let timeout = g:python_pep8_indent_searchpair_timeout
let skip_special_chars = 's:_skip_special_chars(line("."), col("."))'
for [p, maxoff] in items(s:paren_pairs)
let stopline = max([0, line('.') - maxoff, nearest[0]])
let next = searchpairpos(
\ '\V'.p[0], '', '\V'.p[1], 'bnW', skip_special_chars, stopline, timeout)
if next[0] && (next[0] > nearest[0] || (next[0] == nearest[0] && next[1] > nearest[1]))
let nearest = next
endif
endfor
return nearest
endfunction
" Find the start of a multi-line statement
function! s:find_start_of_multiline_statement(lnum)
let lnum = a:lnum
while lnum > 0
if getline(lnum - 1) =~# '\\$'
let lnum = prevnonblank(lnum - 1)
else
let [paren_lnum, _] = s:find_opening_paren(lnum, 1)
if paren_lnum < 1
return lnum
else
let lnum = paren_lnum
endif
endif
endwhile
endfunction
" Find possible indent(s) of the block starter that matches the current line.
function! s:find_start_of_block(lnum, types, skip, multiple) abort
let r = []
let re = '\V\^\s\*\('.join(a:types, '\|').'\)\>'
if !empty(a:skip)
let re_skip = '\V\^\s\*\('.join(a:skip, '\|').'\)\>'
else
let re_skip = ''
endif
let last_indent = indent(a:lnum) + 1
let lnum = a:lnum - 1
while lnum > 0 && last_indent > 0
let indent = indent(lnum)
if indent < last_indent
let line = getline(lnum)
if !empty(re_skip) && line =~# re_skip
let last_indent = indent
elseif line =~# re
if !a:multiple
return [indent]
endif
if index(r, indent) == -1
let r += [indent]
endif
let last_indent = indent
endif
endif
let lnum = prevnonblank(lnum - 1)
endwhile
return r
endfunction
" Is "expr" true for every position in "lnum", beginning at "start"?
" (optionally up to a:1 / 4th argument)
function! s:match_expr_on_line(expr, lnum, start, ...)
let text = getline(a:lnum)
let end = a:0 ? a:1 : len(text)
if a:start > end
return 1
endif
let save_pos = getpos('.')
let r = 1
for i in range(a:start, end)
call cursor(a:lnum, i)
if !(eval(a:expr) || text[i-1] =~# '\s')
let r = 0
break
endif
endfor
call setpos('.', save_pos)
return r
endfunction
" Line up with open parenthesis/bracket/brace.
function! s:indent_like_opening_paren(lnum)
let [paren_lnum, paren_col] = s:find_opening_paren(a:lnum, 1)
if paren_lnum <= 0
return -2
endif
let text = getline(paren_lnum)
let base = indent(paren_lnum)
let nothing_after_opening_paren = s:match_expr_on_line(
\ s:skip_after_opening_paren, paren_lnum, paren_col+1)
let starts_with_closing_paren = getline(a:lnum) =~# '^\s*[])}]'
let hang_closing = get(b:, 'python_pep8_indent_hang_closing',
\ get(g:, 'python_pep8_indent_hang_closing', 0))
if nothing_after_opening_paren
if starts_with_closing_paren && !hang_closing
let res = base
else
let res = base + s:sw()
" Special case for parenthesis.
if text[paren_col-1] ==# '(' && getline(a:lnum) !~# '\v\)\s*:?\s*$'
return res
endif
endif
else
" Indent to match position of opening paren.
let res = paren_col
endif
" If this line is the continuation of a control statement
" indent further to distinguish the continuation line
" from the next logical line.
if text =~# b:control_statement && res == base + s:sw()
" But only if not inside parens itself (Flake's E127).
let [paren_lnum, _] = s:find_opening_paren(paren_lnum, 1)
if paren_lnum <= 0
return res + s:sw()
endif
endif
return res
endfunction
" Match indent of first block of this type.
function! s:indent_like_block(lnum)
let text = getline(a:lnum)
for [multiple, block_rules] in [
\ [0, s:block_rules],
\ [1, s:block_rules_multiple],
\ ]
for [line_re, blocks_ignore] in items(block_rules)
if text !~# line_re
continue
endif
let [blocks, skip] = blocks_ignore
let indents = s:find_start_of_block(a:lnum, blocks, skip, multiple)
if empty(indents)
return -1
endif
if len(indents) == 1
return indents[0]
endif
" Multiple valid indents, e.g. for 'else' with both try and if.
let indent = indent(a:lnum)
if index(indents, indent) != -1
" The indent is valid, keep it.
return indent
endif
" Fallback to the first/nearest one.
return indents[0]
endfor
endfor
return -2
endfunction
function! s:indent_like_previous_line(lnum)
let lnum = prevnonblank(a:lnum - 1)
" No previous line, keep current indent.
if lnum < 1
return -1
endif
let text = getline(lnum)
let start = s:find_start_of_multiline_statement(lnum)
let base = indent(start)
let current = indent(a:lnum)
" Ignore last character in previous line?
let lastcol = len(text)
let col = lastcol
" Search for final colon that is not inside something to be ignored.
while 1
if col == 1 | break | endif
if text[col-1] =~# '\s' || s:_skip_special_chars(lnum, col)
let col = col - 1
continue
elseif text[col-1] ==# ':'
return base + s:sw()
endif
break
endwhile
if text =~# '\\$' && !s:_skip_special_chars(lnum, lastcol)
" If this line is the continuation of a control statement
" indent further to distinguish the continuation line
" from the next logical line.
if getline(start) =~# b:control_statement
return base + s:sw() * 2
endif
" Nest (other) explicit continuations only one level deeper.
return base + s:sw()
endif
let empty = getline(a:lnum) =~# '^\s*$'
" Current and prev line are empty, next is not -> indent like next.
if empty && a:lnum > 1 &&
\ (getline(a:lnum - 1) =~# '^\s*$') &&
\ !(getline(a:lnum + 1) =~# '^\s*$')
return indent(a:lnum + 1)
endif
" If the previous statement was a stop-execution statement or a pass
if getline(start) =~# s:stop_statement
" Remove one level of indentation if the user hasn't already dedented
if empty || current > base - s:sw()
return base - s:sw()
endif
" Otherwise, trust the user
return -1
endif
if (current || !empty) && s:is_dedented_already(current, base)
return -1
endif
" In all other cases, line up with the start of the previous statement.
return base
endfunction
" If this line is dedented and the number of indent spaces is valid
" (multiple of the indentation size), trust the user.
function! s:is_dedented_already(current, base)
let dedent_size = a:current - a:base
return (dedent_size < 0 && a:current % s:sw() == 0) ? 1 : 0
endfunction
" Is the syntax at lnum (and optionally cnum) a python string?
function! s:is_python_string(lnum, ...)
let line = getline(a:lnum)
if a:0
let cols = type(a:1) != type([]) ? [a:1] : a:1
else
let cols = range(1, max([1, len(line)]))
endif
for cnum in cols
if match(map(synstack(a:lnum, cnum),
\ "synIDattr(v:val, 'name')"), 'python\S*String') == -1
return 0
end
endfor
return 1
endfunction
function! GetPythonPEPIndent(lnum)
" First line has indent 0
if a:lnum == 1
return 0
endif
let line = getline(a:lnum)
let prevline = getline(a:lnum-1)
" Multilinestrings: continous, docstring or starting.
if s:is_python_string(a:lnum-1, max([1, len(prevline)]))
\ && (s:is_python_string(a:lnum, 1)
\ || match(line, '^\%("""\|''''''\)') != -1)
" Indent closing quotes as the line with the opening ones.
let match_quotes = match(line, '^\s*\zs\%("""\|''''''\)')
if match_quotes != -1
" closing multiline string
let quotes = line[match_quotes:(match_quotes+2)]
call cursor(a:lnum, 1)
let pairpos = searchpairpos(quotes, '', quotes, 'bW', '', 0, g:python_pep8_indent_searchpair_timeout)
if pairpos[0] != 0
return indent(pairpos[0])
else
return -1
endif
endif
if s:is_python_string(a:lnum-1)
" Previous line is (completely) a string: keep current indent.
return -1
endif
if match(prevline, '^\s*\%("""\|''''''\)') != -1
" docstring.
return indent(a:lnum-1)
endif
let indent_multi = get(b:, 'python_pep8_indent_multiline_string',
\ get(g:, 'python_pep8_indent_multiline_string', 0))
if match(prevline, '\v%("""|'''''')$') != -1
" Opening multiline string, started in previous line.
if (&autoindent && indent(a:lnum) == indent(a:lnum-1))
\ || match(line, '\v^\s+$') != -1
" <CR> with empty line or to split up 'foo("""bar' into
" 'foo("""' and 'bar'.
if indent_multi == -2
return indent(a:lnum-1) + s:sw()
endif
return indent_multi
endif
endif
" Keep existing indent.
if match(line, '\v^\s*\S') != -1
return -1
endif
if indent_multi != -2
return indent_multi
endif
return s:indent_like_opening_paren(a:lnum)
endif
" Parens: If we can find an open parenthesis/bracket/brace, line up with it.
let indent = s:indent_like_opening_paren(a:lnum)
if indent >= -1
return indent
endif
" Blocks: Match indent of first block of this type.
let indent = s:indent_like_block(a:lnum)
if indent >= -1
return indent
endif
return s:indent_like_previous_line(a:lnum)
endfunction
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