"=============================================================================
"
" FileName: python.vim
" Desc: 修改了缩进的bug
"
" Author: dantezhu - http://www.vimer.cn
" Email: zny2008@gmail.com
"
" Created: 2011年02月21日 23:55:50
" Version: 0.0.9
" History:
" 0.0.9 | dantezhu | 2011年03月15日 10:15:05 | 注释和string不缩进
" 0.0.8 | dantezhu | 2011年03月10日 18:41:15 | 之前修正的有点问题
" 0.0.7 | dantezhu | 2011年03月10日 11:06:01 | 向cindent看齐,函数名
" | 太短则和匹配的地方对齐
" 0.0.6 | dantezhu | 2011年02月26日 23:45:18 | 只约束是字母太弱了,
" | 还有数字和下划线
" 0.0.5 | dantezhu | 2011年02月26日 23:28:16 | 修正对调用函数时,多
" | 行参数的)的缩进
" 0.0.4 | dantezhu | 2011年02月24日 19:32:14 | 之前的fix有问题,重写
" 0.0.3 | dantezhu | 2011年02月22日 14:53:40 | 修正了Comment或者
" | String中存在:时就会缩
" | 进的问题
" 0.0.2 | dantezhu | 2011年02月22日 01:15:53 | 增加了对class,if,elif
" | 等的兼容
" 0.0.1 | dantezhu | 2011年02月21日 23:55:50 | initialization
"
"=============================================================================

" Python indent file
" Language:	 Python
" Maintainer:	 Eric Mc Sween <em@tomcom.de>
" Original Author: David Bustos <bustos@caltech.edu> 
" Last Change: 2004 Jun 07

" Only load this indent file when no other was loaded.
if exists("b:did_indent")
 finish
endif
let b:did_indent = 1

setlocal expandtab
setlocal nolisp
setlocal autoindent
setlocal indentexpr=GetPythonIndent(v:lnum)
setlocal indentkeys=!^F,o,O,<:>,0),0],0},=elif,=except

let s:maxoff = 50

" 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
 endif 

 " Put the cursor on the match
 if parlnum > 0
 call cursor(parlnum, parcol)
 endif
 return parlnum
endfunction

" Find the start of a multi-line statement
function! s:StatementStart(lnum)
 let lnum = a:lnum
 while 1
 if getline(lnum - 1) =~ '\\$'
 let lnum = lnum - 1
 else
 call cursor(lnum, 1)
 let maybe_lnum = s:SearchParensPair()
 if maybe_lnum < 1
 return lnum
 else
 let lnum = maybe_lnum
 endif
 endif
 endwhile
endfunction

" Find the block starter that matches the current line
function! s:BlockStarter(lnum, block_start_re)
 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
 endif
 endif
 endif
 endwhile
 return -1
endfunction
 
function! GetPythonIndent(lnum)

 " First line has indent 0
 if a:lnum == 1
 return 0
 endif

"Add-Begin by dantezhu in 2011年03月15日 10:14:01
"修正注释和字符串缩进的问题
 " If the start of the line is in a string don't change the indent.
 if has('syntax_items')
 \ && synIDattr(synID(a:lnum, col('.')-1, 1), 'name') =~ '\(Comment\|String\)$'
 return -1
 endif
"Add-End

 " 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
 "Mod-Begin by dantezhu in 2011年02月21日 23:38:24
 "FROM
 "return indent(parlnum)
 "TO
 "为了支持如下的格式:
 "def fun(
 " a,
 " b
 " ):
 " print a,b
 "又不影响如下格式:
 "val = {
 " (
 " 1,
 " 2
 " ):1
 "}

 "Add-Begin by dantezhu in 2011年02月26日 23:23:08
 "增加了对
 "x = user.getdata1_(
 " a,
 " b,
 " c
 " )
 "的支持
 if match(getline(parlnum), '\(\a\|\d\|_\)\s*(\s*$', 0) != -1
 "增加了对
 "x(
 " 1,
 " 2,
 " 3
 " )
 "user.login(
 " 1,
 " 2,
 " 3
 " )
 " 的支持
 if (parcol -1 - indent(parlnum)) < 4
 return parcol - 1
 else
 return indent(parlnum) + &sw
 endif
 endif
 "Add-End
 if match(getline(a:lnum), ')\s*:') != -1 && 
 \ match(getline(parlnum), '\(def\|class\|if\|elif\|while\)\(\s\+\|(\)') != -1
 return indent(parlnum) + &sw
 else
 return indent(parlnum)
 endif
 "Mod-End
 else
 return indent(parlnum) + &sw
 endif
 else
 if closing_paren
 return parcol - 1
 else
 return parcol
 endif
 endif
 endif

 " Examine this line
 let thisline = getline(a:lnum)
 let thisindent = indent(a:lnum)

 " 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
 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)
 else
 return -1
 endif
 endif

 " Examine previous line
 let plnum = a:lnum - 1
 let pline = getline(plnum)
 let sslnum = s:StatementStart(plnum)

 " If the previous line is blank, keep the same indentation
 if pline =~ '^\s*$'
 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
 endif
 endif

 " If the previous line ended with a colon, indent relative to
 " statement start.
 if pline =~ ':\s*$'
 "Mod-Begin by dantezhu in 2011年02月24日 19:30:52
 "FROM
 "return indent(sslnum) + &sw
 "TO
 let t_col = match(pline,':\s*$')+1
 if synIDattr(synID(a:lnum-1, t_col, 1), 'name') !~ '\(Comment\|String\)$'
 return indent(sslnum) + &sw
 endif
 "Mod-End
 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
 endif
 " Otherwise, trust the user
 return -1
 endif

 " In all other cases, line up with the start of the previous statement.
 return indent(sslnum)
 endfunction