" 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
" Only load this indent file when no other was loaded.
setlocal autoindent
setlocal indentexpr=GetPythonPEPIndent(v:lnum)
setlocal indentkeys=!^F,o,O,<:>,0),0],0},=elif,=except
+setlocal tabstop=4
+setlocal softtabstop=4
+setlocal shiftwidth=4
let s:maxoff = 50
+let s:block_rules = {
+ \ '^\s*elif\>': ['if', 'elif'],
+ \ '^\s*else\>': ['if', 'elif', 'for', 'try', 'except'],
+ \ '^\s*except\>': ['try', 'except'],
+ \ '^\s*finally\>': ['try', 'except', 'else']
+ \ }
+let s:paren_pairs = ['()', '{}', '[]']
+let s:control_statement = '^\s*\(if\|while\|with\|for\|except\)\>'
+let s:stop_statement = '^\s*\(break\|continue\|raise\|return\|pass\)\>'
-" 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
+" Skip strings and comments
+let s:skip_special_chars = 'synIDattr(synID(line("."), col("."), 0), "name") ' .
+ \ '=~? "string\\|comment"'
+
+let s:skip_search = 'synIDattr(synID(line("."), col("."), 0), "name") ' .
+ \ '=~? "comment"'
+
+" compatibility with vim patch 7.3.629: 'sw' can be set to -1 to follow 'ts'
+if exists('*shiftwidth')
+ function! s:sw()
+ return shiftwidth()
+ endfunction
+else
+ function! s:sw()
+ return &sw
+ endfunction
+endif
+
+function! s:pair_sort(x, y)
+ if a:x[0] == a:y[0]
+ return a:x[1] == a:y[1] ? 0 : a:x[1] > a:y[1] ? 1 : -1
+ else
+ return a:x[0] > a:y[0] ? 1 : -1
endif
+endfunction
- " Put the cursor on the match
- if parlnum > 0
- call cursor(parlnum, parcol)
+" Find backwards the closest open parenthesis/bracket/brace.
+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
- return parlnum
+
+ let stopline = max([0, line('.') - s:maxoff])
+
+ " Return if cursor is in a comment or string
+ exe 'if' s:skip_search '| return [0, 0] | endif'
+
+ let positions = []
+ for p in s:paren_pairs
+ call add(positions, searchpairpos(
+ \ '\V'.p[0], '', '\V'.p[1], 'bnW', s:skip_special_chars, stopline))
+ endfor
+
+ " Remove empty matches and return the type with the closest match
+ call filter(positions, 'v:val[0]')
+ call sort(positions, 's:pair_sort')
+
+ return get(positions, -1, [0, 0])
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
+ while lnum > 0
if getline(lnum - 1) =~ '\\$'
- let lnum = 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)
+function! s:find_start_of_block(lnum, 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
+ let last_indent = indent(lnum) + 1
+ while lnum > 0 && last_indent > 0
+ if indent(lnum) < last_indent
+ if getline(lnum) =~# 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
- endif
endif
+ let last_indent = indent(lnum)
endif
+ let lnum = prevnonblank(lnum - 1)
endwhile
- return -1
+ return 0
endfunction
-function! GetPythonPEPIndent(lnum)
-
- " First line has indent 0
- if a:lnum == 1
- return 0
+" 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)
- " 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*$', parcol - 1) != -1
- if closing_paren
- return indent(parlnum)
- else
- return indent(parlnum) + &shiftwidth
- endif
+ let nothing_after_opening_paren = text =~ '\%'.(paren_col + 1).'c\s*$'
+ let starts_with_closing_paren = getline(a:lnum) =~ '^\s*[])}]'
+
+ if nothing_after_opening_paren
+ if starts_with_closing_paren
+ let res = base
else
- return parcol
+ let res = base + s:sw()
endif
+ else
+ " Indent to match position of opening paren.
+ let res = paren_col
endif
- " Examine this line
- let thisline = getline(a:lnum)
- let thisindent = indent(a:lnum)
+ " If this line is the continuation of a control statement
+ " indent further to distinguish the continuation line
+ " from the next logical line.
+ if text =~# s:control_statement && res == base + s:sw()
+ return base + s:sw() * 2
+ else
+ return res
+ endif
+endfunction
- " 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)
- else
- return -1
+" Match indent of first block of this type.
+function! s:indent_like_block(lnum)
+ let text = getline(a:lnum)
+
+ for [line_re, blocks] in items(s:block_rules)
+ if text !~# line_re
+ continue
endif
- 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)
+ let lnum = s:find_start_of_block(a:lnum - 1, blocks)
+ if lnum > 0
+ return indent(lnum)
else
return -1
endif
- endif
+ endfor
- " Examine previous line
- let plnum = a:lnum - 1
- let pline = getline(plnum)
- let sslnum = s:StatementStart(plnum)
+ return -2
+endfunction
- " If the previous line is blank, keep the same indentation
- if pline =~ '^\s*$'
- return -1
+function! s:indent_like_previous_line(lnum)
+ let lnum = prevnonblank(a:lnum - 1)
+
+ " No previous line, keep current indent.
+ if lnum < 1
+ return -1
endif
- " If this line is explicitly joined, find the first indentation that is a
- " multiple of four and will distinguish itself from next logical line.
- if pline =~ '\\$'
- let maybe_indent = indent(sslnum) + &sw
- let control_structure = '^\s*\(if\|while\|for\s.*\sin\|except\)\s*'
- if match(getline(sslnum), control_structure) != -1
- " add extra indent to avoid E125
- return maybe_indent + &sw
- else
- " control structure not found
- return maybe_indent
+ 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 a string or comment.
+ while search(':\s*\%(#.*\)\?$', 'bcW', lnum)
+ if eval(s:skip_special_chars)
+ normal! h
+ else
+ return base + s:sw()
+ endif
+ endwhile
+
+ if text =~ '\\$' && !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) =~# s:control_statement
+ return base + s:sw() * 2
endif
- endif
- " If the previous line ended with a colon and is not a comment, indent
- " relative to statement start.
- if pline =~ '^[^#]*:\s*\(#.*\)\?$'
- return indent(sslnum) + &sw
+ " Nest (other) explicit continuations only one level deeper.
+ return base + s:sw()
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 indent(a:lnum) > base - s:sw()
+ return base - s:sw()
endif
" Otherwise, trust the user
return -1
endif
+ " If this line is dedented and the number of indent spaces is valid
+ " (multiple of the indentation size), trust the user
+ let dedent_size = current - base
+ if dedent_size < 0 && current % s:sw() == 0
+ return -1
+ endif
+
" In all other cases, line up with the start of the previous statement.
- return indent(sslnum)
+ return base
+endfunction
+
+function! GetPythonPEPIndent(lnum)
+
+ " First line has indent 0
+ if a:lnum == 1
+ return 0
+ 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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