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