" Vim indent file
" Language: Falcon
" Maintainer: Steven Oliver <oliver.steven@gmail.com>
" Website: https://steveno@github.com/steveno/falconpl-vim.git
" Credits: This is, to a great extent, a copy n' paste of ruby.vim.
" 1. Setup {{{1
" ============
" Only load this indent file when no other was loaded.
if exists("b:did_indent")
finish
endif
let b:did_indent = 1
setlocal nosmartindent
" Setup indent function and when to use it
setlocal indentexpr=FalconGetIndent(v:lnum)
setlocal indentkeys=0{,0},0),0],!^F,o,O,e
setlocal indentkeys+==~case,=~catch,=~default,=~elif,=~else,=~end,=~\"
" Define the appropriate indent function but only once
if exists("*FalconGetIndent")
finish
endif
let s:cpo_save = &cpo
set cpo&vim
" 2. Variables {{{1
" ============
" Regex of syntax group names that are strings AND comments
let s:syng_strcom = '\<falcon\%(String\|StringEscape\|Comment\)\>'
" Regex of syntax group names that are strings
let s:syng_string = '\<falcon\%(String\|StringEscape\)\>'
" Regex that defines blocks.
"
" Note that there's a slight problem with this regex and s:continuation_regex.
" Code like this will be matched by both:
"
" method_call do |(a, b)|
"
" The reason is that the pipe matches a hanging "|" operator.
"
let s:block_regex =
\ '\%(\<do:\@!\>\|%\@<!{\)\s*\%(|\s*(*\s*\%([*@&]\=\h\w*,\=\s*\)\%(,\s*(*\s*[*@&]\=\h\w*\s*)*\s*\)*|\)\=\s*\%(#.*\)\=$'
let s:block_continuation_regex = '^\s*[^])}\t ].*'.s:block_regex
" Regex that defines continuation lines.
" TODO: this needs to deal with if ...: and so on
let s:continuation_regex =
\ '\%(%\@<![({[\\.,:*/%+]\|\<and\|\<or\|\%(<%\)\@<![=-]\|\W[|&?]\|||\|&&\)\s*\%(#.*\)\=$'
" Regex that defines bracket continuations
let s:bracket_continuation_regex = '%\@<!\%([({[]\)\s*\%(#.*\)\=$'
" Regex that defines continuation lines, not including (, {, or [.
let s:non_bracket_continuation_regex = '\%([\\.,:*/%+]\|\<and\|\<or\|\%(<%\)\@<![=-]\|\W[|&?]\|||\|&&\)\s*\%(#.*\)\=$'
" Keywords to indent on
let s:falcon_indent_keywords = '^\s*\(case\|catch\|class\|enum\|default\|elif\|else' .
\ '\|for\|function\|if.*"[^"]*:.*"\|if \(\(:\)\@!.\)*$\|loop\|object\|select' .
\ '\|switch\|try\|while\|\w*\s*=\s*\w*([$\)'
" Keywords to deindent on
let s:falcon_deindent_keywords = '^\s*\(case\|catch\|default\|elif\|else\|end\)'
" 3. Functions {{{1
" ============
" Check if the character at lnum:col is inside a string, comment, or is ascii.
function s:IsInStringOrComment(lnum, col)
return synIDattr(synID(a:lnum, a:col, 1), 'name') =~ s:syng_strcom
endfunction
" Check if the character at lnum:col is inside a string.
function s:IsInString(lnum, col)
return synIDattr(synID(a:lnum, a:col, 1), 'name') =~ s:syng_string
endfunction
" Check if the character at lnum:col is inside a string delimiter
function s:IsInStringDelimiter(lnum, col)
return synIDattr(synID(a:lnum, a:col, 1), 'name') == 'falconStringDelimiter'
endfunction
" Find line above 'lnum' that isn't empty, in a comment, or in a string.
function s:PrevNonBlankNonString(lnum)
let in_block = 0
let lnum = prevnonblank(a:lnum)
while lnum > 0
" Go in and out of blocks comments as necessary.
" If the line isn't empty (with opt. comment) or in a string, end search.
let line = getline(lnum)
if line =~ '^=begin'
if in_block
let in_block = 0
else
break
endif
elseif !in_block && line =~ '^=end'
let in_block = 1
elseif !in_block && line !~ '^\s*#.*$' && !(s:IsInStringOrComment(lnum, 1)
\ && s:IsInStringOrComment(lnum, strlen(line)))
break
endif
let lnum = prevnonblank(lnum - 1)
endwhile
return lnum
endfunction
" Find line above 'lnum' that started the continuation 'lnum' may be part of.
function s:GetMSL(lnum)
" Start on the line we're at and use its indent.
let msl = a:lnum
let msl_body = getline(msl)
let lnum = s:PrevNonBlankNonString(a:lnum - 1)
while lnum > 0
" If we have a continuation line, or we're in a string, use line as MSL.
" Otherwise, terminate search as we have found our MSL already.
let line = getline(lnum)
if s:Match(line, s:non_bracket_continuation_regex) &&
\ s:Match(msl, s:non_bracket_continuation_regex)
" If the current line is a non-bracket continuation and so is the
" previous one, keep its indent and continue looking for an MSL.
"
" Example:
" method_call one,
" two,
" three
"
let msl = lnum
elseif s:Match(lnum, s:non_bracket_continuation_regex) &&
\ (s:Match(msl, s:bracket_continuation_regex) || s:Match(msl, s:block_continuation_regex))
" If the current line is a bracket continuation or a block-starter, but
" the previous is a non-bracket one, respect the previous' indentation,
" and stop here.
"
" Example:
" method_call one,
" two {
" three
"
return lnum
elseif s:Match(lnum, s:bracket_continuation_regex) &&
\ (s:Match(msl, s:bracket_continuation_regex) || s:Match(msl, s:block_continuation_regex))
" If both lines are bracket continuations (the current may also be a
" block-starter), use the current one's and stop here
"
" Example:
" method_call(
" other_method_call(
" foo
return msl
elseif s:Match(lnum, s:block_regex) &&
\ !s:Match(msl, s:continuation_regex) &&
\ !s:Match(msl, s:block_continuation_regex)
" If the previous line is a block-starter and the current one is
" mostly ordinary, use the current one as the MSL.
"
" Example:
" method_call do
" something
" something_else
return msl
else
let col = match(line, s:continuation_regex) + 1
if (col > 0 && !s:IsInStringOrComment(lnum, col))
\ || s:IsInString(lnum, strlen(line))
let msl = lnum
else
break
endif
endif
let msl_body = getline(msl)
let lnum = s:PrevNonBlankNonString(lnum - 1)
endwhile
return msl
endfunction
" Check if line 'lnum' has more opening brackets than closing ones.
function s:ExtraBrackets(lnum)
let opening = {'parentheses': [], 'braces': [], 'brackets': []}
let closing = {'parentheses': [], 'braces': [], 'brackets': []}
let line = getline(a:lnum)
let pos = match(line, '[][(){}]', 0)
" Save any encountered opening brackets, and remove them once a matching
" closing one has been found. If a closing bracket shows up that doesn't
" close anything, save it for later.
while pos != -1
if !s:IsInStringOrComment(a:lnum, pos + 1)
if line[pos] == '('
call add(opening.parentheses, {'type': '(', 'pos': pos})
elseif line[pos] == ')'
if empty(opening.parentheses)
call add(closing.parentheses, {'type': ')', 'pos': pos})
else
let opening.parentheses = opening.parentheses[0:-2]
endif
elseif line[pos] == '{'
call add(opening.braces, {'type': '{', 'pos': pos})
elseif line[pos] == '}'
if empty(opening.braces)
call add(closing.braces, {'type': '}', 'pos': pos})
else
let opening.braces = opening.braces[0:-2]
endif
elseif line[pos] == '['
call add(opening.brackets, {'type': '[', 'pos': pos})
elseif line[pos] == ']'
if empty(opening.brackets)
call add(closing.brackets, {'type': ']', 'pos': pos})
else
let opening.brackets = opening.brackets[0:-2]
endif
endif
endif
let pos = match(line, '[][(){}]', pos + 1)
endwhile
" Find the rightmost brackets, since they're the ones that are important in
" both opening and closing cases
let rightmost_opening = {'type': '(', 'pos': -1}
let rightmost_closing = {'type': ')', 'pos': -1}
for opening in opening.parentheses + opening.braces + opening.brackets
if opening.pos > rightmost_opening.pos
let rightmost_opening = opening
endif
endfor
for closing in closing.parentheses + closing.braces + closing.brackets
if closing.pos > rightmost_closing.pos
let rightmost_closing = closing
endif
endfor
return [rightmost_opening, rightmost_closing]
endfunction
function s:Match(lnum, regex)
let col = match(getline(a:lnum), '\C'.a:regex) + 1
return col > 0 && !s:IsInStringOrComment(a:lnum, col) ? col : 0
endfunction
function s:MatchLast(lnum, regex)
let line = getline(a:lnum)
let col = match(line, '.*\zs' . a:regex)
while col != -1 && s:IsInStringOrComment(a:lnum, col)
let line = strpart(line, 0, col)
let col = match(line, '.*' . a:regex)
endwhile
return col + 1
endfunction
" 4. FalconGetIndent Routine {{{1
" ============
function FalconGetIndent(...)
" For the current line, use the first argument if given, else v:lnum
let clnum = a:0 ? a:1 : v:lnum
" Use zero indent at the top of the file
if clnum == 0
return 0
endif
let line = getline(clnum)
let ind = -1
" If we got a closing bracket on an empty line, find its match and indent
" according to it. For parentheses we indent to its column - 1, for the
" others we indent to the containing line's MSL's level. Return -1 if fail.
let col = matchend(line, '^\s*[]})]')
if col > 0 && !s:IsInStringOrComment(clnum, col)
call cursor(clnum, col)
let bs = strpart('(){}[]', stridx(')}]', line[col - 1]) * 2, 2)
if searchpair(escape(bs[0], '\['), '', bs[1], 'bW', s:skip_expr) > 0
if line[col-1]==')' && col('.') != col('$') - 1
let ind = virtcol('.') - 1
else
let ind = indent(s:GetMSL(line('.')))
endif
endif
return ind
endif
" If we have a deindenting keyword, find its match and indent to its level.
" TODO: this is messy
if s:Match(clnum, s:falcon_deindent_keywords)
call cursor(clnum, 1)
if searchpair(s:end_start_regex, s:end_middle_regex, s:end_end_regex, 'bW',
\ s:end_skip_expr) > 0
let msl = s:GetMSL(line('.'))
let line = getline(line('.'))
if strpart(line, 0, col('.') - 1) =~ '=\s*$' &&
\ strpart(line, col('.') - 1, 2) !~ 'do'
let ind = virtcol('.') - 1
elseif getline(msl) =~ '=\s*\(#.*\)\=$'
let ind = indent(line('.'))
else
let ind = indent(msl)
endif
endif
return ind
endif
" If we are in a multi-line string or line-comment, don't do anything to it.
if s:IsInString(clnum, matchend(line, '^\s*') + 1)
return indent('.')
endif
" Find a non-blank, non-multi-line string line above the current line.
let lnum = s:PrevNonBlankNonString(clnum - 1)
" If the line is empty and inside a string, use the previous line.
if line =~ '^\s*$' && lnum != prevnonblank(clnum - 1)
return indent(prevnonblank(clnum))
endif
" At the start of the file use zero indent.
if lnum == 0
return 0
endif
" Set up variables for the previous line.
let line = getline(lnum)
let ind = indent(lnum)
" If the previous line ended with a block opening, add a level of indent.
if s:Match(lnum, s:block_regex)
return indent(s:GetMSL(lnum)) + shiftwidth()
endif
" If it contained hanging closing brackets, find the rightmost one, find its
" match and indent according to that.
if line =~ '[[({]' || line =~ '[])}]\s*\%(#.*\)\=$'
let [opening, closing] = s:ExtraBrackets(lnum)
if opening.pos != -1
if opening.type == '(' && searchpair('(', '', ')', 'bW', s:skip_expr) > 0
if col('.') + 1 == col('$')
return ind + shiftwidth()
else
return virtcol('.')
endif
else
let nonspace = matchend(line, '\S', opening.pos + 1) - 1
return nonspace > 0 ? nonspace : ind + shiftwidth()
endif
elseif closing.pos != -1
call cursor(lnum, closing.pos + 1)
normal! %
if s:Match(line('.'), s:falcon_indent_keywords)
return indent('.') + shiftwidth()
else
return indent('.')
endif
else
call cursor(clnum, vcol)
end
endif
" If the previous line ended with an "end", match that "end"s beginning's
" indent.
let col = s:Match(lnum, '\%(^\|[^.:@$]\)\<end\>\s*\%(#.*\)\=$')
if col > 0
call cursor(lnum, col)
if searchpair(s:end_start_regex, '', s:end_end_regex, 'bW',
\ s:end_skip_expr) > 0
let n = line('.')
let ind = indent('.')
let msl = s:GetMSL(n)
if msl != n
let ind = indent(msl)
end
return ind
endif
end
let col = s:Match(lnum, s:falcon_indent_keywords)
if col > 0
call cursor(lnum, col)
let ind = virtcol('.') - 1 + shiftwidth()
" TODO: make this better (we need to count them) (or, if a searchpair
" fails, we know that something is lacking an end and thus we indent a
" level
if s:Match(lnum, s:end_end_regex)
let ind = indent('.')
endif
return ind
endif
" Set up variables to use and search for MSL to the previous line.
let p_lnum = lnum
let lnum = s:GetMSL(lnum)
" If the previous line wasn't a MSL and is continuation return its indent.
" TODO: the || s:IsInString() thing worries me a bit.
if p_lnum != lnum
if s:Match(p_lnum, s:non_bracket_continuation_regex) || s:IsInString(p_lnum,strlen(line))
return ind
endif
endif
" Set up more variables, now that we know we wasn't continuation bound.
let line = getline(lnum)
let msl_ind = indent(lnum)
" If the MSL line had an indenting keyword in it, add a level of indent.
" TODO: this does not take into account contrived things such as
" module Foo; class Bar; end
if s:Match(lnum, s:falcon_indent_keywords)
let ind = msl_ind + shiftwidth()
if s:Match(lnum, s:end_end_regex)
let ind = ind - shiftwidth()
endif
return ind
endif
" If the previous line ended with [*+/.,-=], but wasn't a block ending or a
" closing bracket, indent one extra level.
if s:Match(lnum, s:non_bracket_continuation_regex) && !s:Match(lnum, '^\s*\([\])}]\|end\)')
if lnum == p_lnum
let ind = msl_ind + shiftwidth()
else
let ind = msl_ind
endif
return ind
endif
return ind
endfunction
" }}}1
let &cpo = s:cpo_save
unlet s:cpo_save
" vim: set sw=4 sts=4 et tw=80 :
