Take over maintainership, move it to Vimjas org

[etc/vim.git] / indent / python.vim

diff --git a/indent/python.vim b/indent/python.vim
index 0f58516bc995c80c57da79d5a856904f6dc58626..8a479f49f265bac94c8c66399cc11481581e2325 100644 (file)
--- a/indent/python.vim
+++ b/indent/python.vim
@@ -1,9 +1,23 @@
 " PEP8 compatible Python indent file
 " Language:         Python
 " 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)
 " Prev Maintainer:  Eric Mc Sween <em@tomcom.de> (address invalid)
 " Original Author:  David Bustos <bustos@caltech.edu> (address invalid)

-" 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")
 
 " Only load this indent file when no other was loaded.
 if exists("b:did_indent")


@@ -20,22 +34,52 @@ setlocal tabstop=4
 setlocal softtabstop=4
 setlocal shiftwidth=4
 
 setlocal softtabstop=4
 setlocal shiftwidth=4
 

+if !exists('g:python_pep8_indent_multiline_string')
+    let g:python_pep8_indent_multiline_string = 0
+endif
+

 let s:maxoff = 50
 let s:block_rules = {
 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']
-  \ }
+            \ '^\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'],
+            \ }

 let s:paren_pairs = ['()', '{}', '[]']
 let s:paren_pairs = ['()', '{}', '[]']

-let s:control_statement = '^\s*\(if\|while\|with\|for\|except\)\>'
+if &ft == 'pyrex' || &ft == '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:stop_statement = '^\s*\(break\|continue\|raise\|return\|pass\)\>'
 

-" Skip strings and comments
-let s:skip = 'synIDattr(synID(line("."), col("."), 0), "name") ' .
-           \ '=~? "string\\|comment"'
+" 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

 
 

-" compatibility with vim patch 7.3.629: 'sw' can be set to -1 to follow 'ts'
+
+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()
 if exists('*shiftwidth')
     function! s:sw()
         return shiftwidth()


@@ -67,13 +111,13 @@ function! s:find_opening_paren(...)
 
     let stopline = max([0, line('.') - s:maxoff])
 
 
     let stopline = max([0, line('.') - s:maxoff])
 

-    " Return if cursor is in a comment or string
-    exe 'if' s:skip '| return [0, 0] | endif'
+    " Return if cursor is in a comment.
+    exe 'if' s:skip_search '| return [0, 0] | endif'

 
     let positions = []
     for p in s:paren_pairs
         call add(positions, searchpairpos(
 
     let positions = []
     for p in s:paren_pairs
         call add(positions, searchpairpos(

-           \ '\V'.p[0], '', '\V'.p[1], 'bnW', s:skip, stopline))
+           \ '\V'.p[0], '', '\V'.p[1], 'bnW', s:skip_special_chars, stopline))

     endfor
 
     " Remove empty matches and return the type with the closest match
     endfor
 
     " Remove empty matches and return the type with the closest match


@@ -100,22 +144,55 @@ function! s:find_start_of_multiline_statement(lnum)
     endwhile
 endfunction
 
     endwhile
 endfunction
 

-" Find the block starter that matches the current line
-function! s:find_start_of_block(lnum, types)
+" 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 re = '\V\^\s\*\('.join(a:types, '\|').'\)\>'

-

     let lnum = a:lnum
     let last_indent = indent(lnum) + 1
     while lnum > 0 && last_indent > 0
     let lnum = a:lnum
     let last_indent = indent(lnum) + 1
     while lnum > 0 && last_indent > 0

-        if indent(lnum) < last_indent
-            if getline(lnum) =~# re
-                return lnum
-            endif
+        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
+                    " Remove any handled type, e.g. 'if'.
+                    call remove(types, index(types, type))
+                endif
+            endfor

             let last_indent = indent(lnum)
         endif
         let lnum = prevnonblank(lnum - 1)
     endwhile
             let last_indent = indent(lnum)
         endif
         let lnum = prevnonblank(lnum - 1)
     endwhile

-    return 0
+    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.
 endfunction
 
 " Line up with open parenthesis/bracket/brace.


@@ -127,7 +204,8 @@ function! s:indent_like_opening_paren(lnum)
     let text = getline(paren_lnum)
     let base = indent(paren_lnum)
 
     let text = getline(paren_lnum)
     let base = indent(paren_lnum)
 

-    let nothing_after_opening_paren = text =~ '\%'.(paren_col + 1).'c\s*$'
+    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 nothing_after_opening_paren
     let starts_with_closing_paren = getline(a:lnum) =~ '^\s*[])}]'
 
     if nothing_after_opening_paren


@@ -144,7 +222,7 @@ function! s:indent_like_opening_paren(lnum)
     " If this line is the continuation of a control statement
     " indent further to distinguish the continuation line
     " from the next logical line.
     " 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()
+    if text =~# b:control_statement && res == base + s:sw()

         return base + s:sw() * 2
     else
         return res
         return base + s:sw() * 2
     else
         return res


@@ -154,20 +232,32 @@ endfunction
 " Match indent of first block of this type.
 function! s:indent_like_block(lnum)
     let text = getline(a:lnum)
 " 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

 
 

-    for [line_re, blocks] in items(s:block_rules)
-        if text !~# line_re
-            continue
-        endif
+            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

 
 

-        let lnum = s:find_start_of_block(a:lnum - 1, blocks)
-        if lnum > 0
-            return indent(lnum)
-        else
-            return -1
-        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
     endfor

-

     return -2
 endfunction
 
     return -2
 endfunction
 


@@ -186,22 +276,26 @@ function! s:indent_like_previous_line(lnum)
 
     " Jump to last character in previous line.
     call cursor(lnum, len(text))
 
     " Jump to last character in previous line.
     call cursor(lnum, len(text))

-    let ignore_last_char = eval(s:skip)
-
-    " Search for final colon that is not inside a string or comment.
-    while search(':\s*\%(#.*\)\?$', 'bcW', lnum)
-      if eval(s:skip)
-        normal! h
-      else
-        return base + s:sw()
-      endif
+    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.
     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
+        if getline(start) =~# b:control_statement

             return base + s:sw() * 2
         endif
 
             return base + s:sw() * 2
         endif
 


@@ -219,10 +313,7 @@ function! s:indent_like_previous_line(lnum)
         return -1
     endif
 
         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
+    if s:is_dedented_already(current, base)

         return -1
     endif
 
         return -1
     endif
 


@@ -230,13 +321,94 @@ function! s:indent_like_previous_line(lnum)
     return base
 endfunction
 
     return base
 endfunction
 

-function! GetPythonPEPIndent(lnum)
+" 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)
+    let linelen = len(line)
+    if linelen < 1
+      let linelen = 1
+    endif
+    let cols = a:0 ? type(a:1) != type([]) ? [a:1] : a:1 : range(1, linelen)
+    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
 
     " 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, 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.
+            return indent(a:lnum-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
     " 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