" PEP8 compatible Python indent file
" Language: Python
-" Maintainer: Hynek Schlawack <hs@ox.cx>
+" 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)
-" Last Change: 2012-06-21
-" License: Public Domain
+" 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")
+if exists('b:did_indent')
finish
endif
let b:did_indent = 1
-setlocal expandtab
setlocal nolisp
setlocal autoindent
-setlocal indentexpr=GetPythonIndent(v:lnum)
+setlocal indentexpr=GetPythonPEPIndent(v:lnum)
setlocal indentkeys=!^F,o,O,<:>,0),0],0},=elif,=except
-let s:maxoff = 50
+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
+
+let s:block_rules = {
+ \ '^\s*elif\>': ['if', 'elif'],
+ \ '^\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*\(break\|continue\|raise\|return\|pass\)\>'
+
+" 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.
+let s:skip_special_chars = 'synIDattr(synID(line("."), col("."), 0), "name") ' .
+ \ '=~? "\\vstring|comment|jedi\\S"'
+
+let s:skip_after_opening_paren = 'synIDattr(synID(line("."), col("."), 0), "name") ' .
+ \ '=~? "\\vcomment|jedi\\S"'
+
+" Also ignore anything concealed.
+" 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
+if has('conceal')
+ let s:skip_special_chars .= '|| s:is_concealed(line("."), col("."))'
+endif
+
+
+let s:skip_search = 'synIDattr(synID(line("."), col("."), 0), "name") ' .
+ \ '=~? "comment"'
+
+" 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:SearchParensPair()
- let line = line('.')
- let col = col('.')
-
- " Skip strings and comments and don't look too far
- let skip = "line('.') < " . (line - s:maxoff) . " ? dummy :" .
- \ 'synIDattr(synID(line("."), col("."), 0), "name") =~? ' .
- \ '"string\\|comment"'
-
- " Search for parentheses
- call cursor(line, col)
- let parlnum = searchpair('(', '', ')', 'bW', skip)
- let parcol = col('.')
-
- " Search for brackets
- call cursor(line, col)
- let par2lnum = searchpair('\[', '', '\]', 'bW', skip)
- let par2col = col('.')
-
- " Search for braces
- call cursor(line, col)
- let par3lnum = searchpair('{', '', '}', 'bW', skip)
- let par3col = col('.')
-
- " Get the closest match
- if par2lnum > parlnum || (par2lnum == parlnum && par2col > parcol)
- let parlnum = par2lnum
- let parcol = par2col
- endif
- if par3lnum > parlnum || (par3lnum == parlnum && par3col > parcol)
- let parlnum = par3lnum
- let parcol = par3col
+function! s:find_opening_paren(...)
+ " optional arguments: line and column (defaults to 1) to search around
+ if a:0 > 0
+ let view = winsaveview()
+ call cursor(a:1, a:0 > 1 ? a:2 : 1)
+ let ret = s:find_opening_paren()
+ call winrestview(view)
+ return ret
endif
- " Put the cursor on the match
- if parlnum > 0
- call cursor(parlnum, parcol)
- endif
- return parlnum
+ " Return if cursor is in a comment.
+ exe 'if' s:skip_search '| return [0, 0] | endif'
+
+ let nearest = [0, 0]
+ 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', s:skip_special_chars, stopline)
+ 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:StatementStart(lnum)
+function! s:find_start_of_multiline_statement(lnum)
let lnum = a:lnum
- while 1
- if getline(lnum - 1) =~ '\\$'
- let lnum = lnum - 1
+ while lnum > 0
+ if getline(lnum - 1) =~# '\\$'
+ let lnum = prevnonblank(lnum - 1)
else
- call cursor(lnum, 1)
- let maybe_lnum = s:SearchParensPair()
- if maybe_lnum < 1
+ let [paren_lnum, _] = s:find_opening_paren(lnum)
+ if paren_lnum < 1
return lnum
else
- let lnum = maybe_lnum
+ let lnum = paren_lnum
endif
endif
endwhile
endfunction
-" Find the block starter that matches the current line
-function! s:BlockStarter(lnum, block_start_re)
+" Find possible indent(s) of the block starter that matches the current line.
+function! s:find_start_of_block(lnum, types, multiple)
+ let r = []
+ let types = copy(a:types)
+ let re = '\V\^\s\*\('.join(a:types, '\|').'\)\>'
let lnum = a:lnum
- let maxindent = 10000 " whatever
- while lnum > 1
- let lnum = prevnonblank(lnum - 1)
- if indent(lnum) < maxindent
- if getline(lnum) =~ a:block_start_re
- return lnum
- else
- let maxindent = indent(lnum)
- " It's not worth going further if we reached the top level
- if maxindent == 0
- return -1
+ let last_indent = indent(lnum) + 1
+ while lnum > 0 && last_indent > 0
+ let indent = indent(lnum)
+ if indent < last_indent
+ for type in types
+ let re = '\v^\s*'.type.'>'
+ if getline(lnum) =~# re
+ if !a:multiple
+ return [indent]
+ endif
+ if index(r, indent) == -1
+ let r += [indent]
+ endif
endif
- endif
+ endfor
+ let last_indent = indent(lnum)
endif
+ let lnum = prevnonblank(lnum - 1)
endwhile
- return -1
+ return r
endfunction
-function! GetPythonIndent(lnum)
-
- " First line has indent 0
- if a:lnum == 1
- return 0
+" 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
-
- " If we can find an open parenthesis/bracket/brace, line up with it.
- call cursor(a:lnum, 1)
- let parlnum = s:SearchParensPair()
- if parlnum > 0
- let parcol = col('.')
- let closing_paren = match(getline(a:lnum), '^\s*[])}]') != -1
- if match(getline(parlnum), '[([{]\s*$', parcol - 1) != -1
- if closing_paren
- return indent(parlnum)
- else
- return indent(parlnum) + &shiftwidth
- endif
- else
- return parcol
+ 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)
+ if paren_lnum <= 0
+ return -2
endif
+ let text = getline(paren_lnum)
+ let base = indent(paren_lnum)
- " Examine this line
- let thisline = getline(a:lnum)
- let thisindent = indent(a: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*[])}]'
- " If the line starts with 'elif' or 'else', line up with 'if' or 'elif'
- if thisline =~ '^\s*\(elif\|else\)\>'
- let bslnum = s:BlockStarter(a:lnum, '^\s*\(if\|elif\)\>')
- if bslnum > 0
- return indent(bslnum)
+ 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
- return -1
+ let res = base + s:sw()
endif
+ else
+ " Indent to match position of opening paren.
+ let res = paren_col
endif
- " If the line starts with 'except' or 'finally', line up with 'try'
- " or 'except'
- if thisline =~ '^\s*\(except\|finally\)\>'
- let bslnum = s:BlockStarter(a:lnum, '^\s*\(try\|except\)\>')
- if bslnum > 0
- return indent(bslnum)
- else
- return -1
+ " 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)
+ if paren_lnum <= 0
+ return res + s:sw()
endif
endif
+ return res
+endfunction
- " Examine previous line
- let plnum = a:lnum - 1
- let pline = getline(plnum)
- let sslnum = s:StatementStart(plnum)
+" 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] in items(block_rules)
+ if text !~# line_re
+ continue
+ endif
- " If the previous line is blank, keep the same indentation
- if pline =~ '^\s*$'
- return -1
+ let indents = s:find_start_of_block(a:lnum - 1, blocks, multiple)
+ if !len(indents)
+ return -1
+ endif
+ if len(indents) == 1
+ return indents[0]
+ endif
+
+ " Multiple valid indents, e.g. for 'else' with both try and if.
+ let indent = indent(a:lnum)
+ if index(indents, indent) != -1
+ " The indent is valid, keep it.
+ return indent
+ endif
+ " Fallback to the first/nearest one.
+ return indents[0]
+ endfor
+ endfor
+ return -2
+endfunction
+
+function! s:indent_like_previous_line(lnum)
+ let lnum = prevnonblank(a:lnum - 1)
+
+ " No previous line, keep current indent.
+ if lnum < 1
+ return -1
endif
- " If this line is explicitly joined, try to find an indentation that looks
- " good.
- if pline =~ '\\$'
- let compound_statement = '^\s*\(if\|while\|for\s.*\sin\|except\)\s*'
- let maybe_indent = matchend(getline(sslnum), compound_statement)
- if maybe_indent != -1
- return maybe_indent
- else
- return indent(sslnum) + &sw * 2
+ let text = getline(lnum)
+ let start = s:find_start_of_multiline_statement(lnum)
+ let base = indent(start)
+ let current = indent(a:lnum)
+
+ " Jump to last character in previous line.
+ call cursor(lnum, len(text))
+ let ignore_last_char = eval(s:skip_special_chars)
+
+ " Search for final colon that is not inside something to be ignored.
+ while 1
+ let curpos = getpos('.')[2]
+ if curpos == 1 | break | endif
+ if eval(s:skip_special_chars) || text[curpos-1] =~# '\s'
+ normal! h
+ continue
+ elseif text[curpos-1] ==# ':'
+ return base + s:sw()
endif
+ break
+ endwhile
+
+ if text =~# '\\$' && !ignore_last_char
+ " 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
- " If the previous line ended with a colon, indent relative to
- " statement start.
- if pline =~ ':\s*$'
- return indent(sslnum) + &sw
+ let empty = getline(a:lnum) =~# '^\s*$'
+
+ " 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 line was a stop-execution statement or a pass
- if getline(sslnum) =~ '^\s*\(break\|continue\|raise\|return\|pass\)\>'
- " See if the user has already dedented
- if indent(a:lnum) > indent(sslnum) - &sw
- " If not, recommend one dedent
- return indent(sslnum) - &sw
+ " 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 !empty && s:is_dedented_already(current, base)
+ return -1
+ endif
+
" In all other cases, line up with the start of the previous statement.
- return indent(sslnum)
+ 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)]
+ let pairpos = searchpairpos(quotes, '', quotes, 'b')
+ if pairpos[0] != 0
+ return indent(pairpos[0])
+ else
+ " TODO: test to cover this!
+ 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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