467 lines
16 KiB
VimL
467 lines
16 KiB
VimL
if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'elixir') == -1
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if !exists("g:elixir_indent_max_lookbehind")
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let g:elixir_indent_max_lookbehind = 30
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endif
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" Return the effective value of 'shiftwidth'
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function! s:sw()
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return &shiftwidth == 0 ? &tabstop : &shiftwidth
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endfunction
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function! elixir#indent#indent(lnum)
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let lnum = a:lnum
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let text = getline(lnum)
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let prev_nb_lnum = prevnonblank(lnum-1)
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let prev_nb_text = getline(prev_nb_lnum)
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call s:debug("==> Indenting line " . lnum)
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call s:debug("text = '" . text . "'")
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let [_, curs_lnum, curs_col, _] = getpos('.')
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call cursor(lnum, 0)
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let handlers = [
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\'top_of_file',
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\'starts_with_end',
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\'starts_with_mid_or_end_block_keyword',
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\'following_trailing_do',
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\'following_trailing_rocket',
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\'following_trailing_binary_operator',
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\'starts_with_pipe',
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\'starts_with_close_bracket',
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\'starts_with_binary_operator',
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\'inside_nested_construct',
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\'starts_with_comment',
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\'inside_generic_block',
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\'follow_prev_nb'
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\]
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for handler in handlers
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call s:debug('testing handler elixir#indent#handle_'.handler)
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let indent = function('elixir#indent#handle_'.handler)(lnum, text, prev_nb_lnum, prev_nb_text)
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if indent != -1
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call s:debug('line '.lnum.': elixir#indent#handle_'.handler.' returned '.indent)
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call cursor(curs_lnum, curs_col)
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return indent
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endif
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endfor
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call s:debug("defaulting")
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call cursor(curs_lnum, curs_col)
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return 0
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endfunction
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function! s:debug(str)
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if exists("g:elixir_indent_debug") && g:elixir_indent_debug
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echom a:str
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endif
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endfunction
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" Returns 0 or 1 based on whether or not the text starts with the given
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" expression and is not a string or comment
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function! s:starts_with(text, expr, lnum)
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let pos = match(a:text, '^\s*'.a:expr)
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if pos == -1
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return 0
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else
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" NOTE: @jbodah 2017-02-24: pos is the index of the match which is
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" zero-indexed. Add one to make it the column number
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if s:is_string_or_comment(a:lnum, pos + 1)
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return 0
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else
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return 1
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end
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end
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endfunction
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" Returns 0 or 1 based on whether or not the text ends with the given
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" expression and is not a string or comment
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function! s:ends_with(text, expr, lnum)
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let pos = match(a:text, a:expr.'\s*$')
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if pos == -1
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return 0
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else
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if s:is_string_or_comment(a:lnum, pos)
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return 0
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else
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return 1
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end
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end
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endfunction
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" Returns 0 or 1 based on whether or not the given line number and column
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" number pair is a string or comment
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function! s:is_string_or_comment(line, col)
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return synIDattr(synID(a:line, a:col, 1), "name") =~ '\%(String\|Comment\)'
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endfunction
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" Skip expression for searchpair. Returns 0 or 1 based on whether the value
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" under the cursor is a string or comment
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function! elixir#indent#searchpair_back_skip()
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" NOTE: @jbodah 2017-02-27: for some reason this function gets called with
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" and index that doesn't exist in the line sometimes. Detect and account for
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" that situation
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let curr_col = col('.')
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if getline('.')[curr_col-1] == ''
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let curr_col = curr_col-1
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endif
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return s:is_string_or_comment(line('.'), curr_col)
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endfunction
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" DRY up regex for keywords that 1) makes sure we only look at complete words
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" and 2) ignores atoms
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function! s:keyword(expr)
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return ':\@<!\<\C\%('.a:expr.'\)\>:\@!'
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endfunction
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" Start at the end of text and search backwards looking for a match. Also peek
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" ahead if we get a match to make sure we get a complete match. This means
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" that the result should be the position of the start of the right-most match
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function! s:find_last_pos(lnum, text, match)
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let last = len(a:text) - 1
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let c = last
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while c >= 0
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let substr = strpart(a:text, c, last)
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let peek = strpart(a:text, c - 1, last)
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let ss_match = match(substr, a:match)
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if ss_match != -1
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let peek_match = match(peek, a:match)
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if peek_match == ss_match + 1
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let syng = synIDattr(synID(a:lnum, c + ss_match, 1), 'name')
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if syng !~ '\%(String\|Comment\)'
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return c + ss_match
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end
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end
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end
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let c -= 1
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endwhile
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return -1
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endfunction
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function! elixir#indent#handle_top_of_file(_lnum, _text, prev_nb_lnum, _prev_nb_text)
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if a:prev_nb_lnum == 0
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return 0
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else
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return -1
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end
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endfunction
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function! elixir#indent#handle_follow_prev_nb(_lnum, _text, prev_nb_lnum, prev_nb_text)
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return s:get_base_indent(a:prev_nb_lnum, a:prev_nb_text)
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endfunction
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" Given the line at `lnum`, returns the indent of the line that acts as the 'base indent'
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" for this line. In particular it traverses backwards up things like pipelines
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" to find the beginning of the expression
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function! s:get_base_indent(lnum, text)
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let prev_nb_lnum = prevnonblank(a:lnum - 1)
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let prev_nb_text = getline(prev_nb_lnum)
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let binary_operator = '\%(=\|<>\|>>>\|<=\|||\|+\|\~\~\~\|-\|&&\|<<<\|/\|\^\^\^\|\*\)'
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let data_structure_close = '\%(\]\|}\|)\)'
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let pipe = '|>'
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if s:starts_with(a:text, binary_operator, a:lnum)
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return s:get_base_indent(prev_nb_lnum, prev_nb_text)
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elseif s:starts_with(a:text, pipe, a:lnum)
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return s:get_base_indent(prev_nb_lnum, prev_nb_text)
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elseif s:ends_with(prev_nb_text, binary_operator, prev_nb_lnum)
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return s:get_base_indent(prev_nb_lnum, prev_nb_text)
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elseif s:ends_with(a:text, data_structure_close, a:lnum)
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let data_structure_open = '\%(\[\|{\|(\)'
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let close_match_idx = match(a:text, data_structure_close . '\s*$')
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call cursor(a:lnum, close_match_idx + 1)
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let [open_match_lnum, open_match_col] = searchpairpos(data_structure_open, '', data_structure_close, 'bnW')
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let open_match_text = getline(open_match_lnum)
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return s:get_base_indent(open_match_lnum, open_match_text)
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else
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return indent(a:lnum)
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endif
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endfunction
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function! elixir#indent#handle_following_trailing_do(lnum, text, prev_nb_lnum, prev_nb_text)
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if s:ends_with(a:prev_nb_text, s:keyword('do'), a:prev_nb_lnum)
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if s:starts_with(a:text, s:keyword('end'), a:lnum)
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return indent(a:prev_nb_lnum)
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else
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return indent(a:prev_nb_lnum) + s:sw()
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end
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else
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return -1
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endif
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endfunction
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function! elixir#indent#handle_following_trailing_rocket(lnum, text, prev_nb_lnum, prev_nb_text)
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if s:ends_with(a:prev_nb_text, '->', a:prev_nb_lnum)
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return indent(a:prev_nb_lnum) + s:sw()
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else
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return -1
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endif
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endfunction
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function! elixir#indent#handle_following_trailing_binary_operator(lnum, text, prev_nb_lnum, prev_nb_text)
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let binary_operator = '\%(=\|<>\|>>>\|<=\|||\|+\|\~\~\~\|-\|&&\|<<<\|/\|\^\^\^\|\*\)'
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if s:ends_with(a:prev_nb_text, binary_operator, a:prev_nb_lnum)
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return indent(a:prev_nb_lnum) + s:sw()
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else
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return -1
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endif
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endfunction
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function! elixir#indent#handle_following_prev_end(_lnum, _text, prev_nb_lnum, prev_nb_text)
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if s:ends_with(a:prev_nb_text, s:keyword('end'), a:prev_nb_lnum)
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return indent(a:prev_nb_lnum)
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else
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return -1
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endif
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endfunction
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function! elixir#indent#handle_starts_with_pipe(lnum, text, prev_nb_lnum, prev_nb_text)
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if s:starts_with(a:text, '|>', a:lnum)
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let match_operator = '\%(!\|=\|<\|>\)\@<!=\%(=\|>\|\~\)\@!'
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let pos = s:find_last_pos(a:prev_nb_lnum, a:prev_nb_text, match_operator)
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if pos == -1
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return indent(a:prev_nb_lnum)
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else
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let next_word_pos = match(strpart(a:prev_nb_text, pos+1, len(a:prev_nb_text)-1), '\S')
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if next_word_pos == -1
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return indent(a:prev_nb_lnum) + s:sw()
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else
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return pos + 1 + next_word_pos
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end
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end
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else
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return -1
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endif
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endfunction
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function! elixir#indent#handle_starts_with_comment(_lnum, text, prev_nb_lnum, _prev_nb_text)
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if match(a:text, '^\s*#') != -1
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return indent(a:prev_nb_lnum)
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else
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return -1
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endif
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endfunction
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function! elixir#indent#handle_starts_with_end(lnum, text, _prev_nb_lnum, _prev_nb_text)
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if s:starts_with(a:text, s:keyword('end'), a:lnum)
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let pair_lnum = searchpair(s:keyword('do\|fn'), '', s:keyword('end').'\zs', 'bnW', "line('.') == " . line('.') . " || elixir#indent#searchpair_back_skip()")
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return indent(pair_lnum)
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else
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return -1
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endif
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endfunction
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function! elixir#indent#handle_starts_with_mid_or_end_block_keyword(lnum, text, _prev_nb_lnum, _prev_nb_text)
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if s:starts_with(a:text, s:keyword('catch\|rescue\|after\|else'), a:lnum)
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let pair_lnum = searchpair(s:keyword('with\|receive\|try\|if\|fn'), s:keyword('catch\|rescue\|after\|else').'\zs', s:keyword('end'), 'bnW', "line('.') == " . line('.') . " || elixir#indent#searchpair_back_skip()")
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return indent(pair_lnum)
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else
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return -1
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endif
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endfunction
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function! elixir#indent#handle_starts_with_close_bracket(lnum, text, _prev_nb_lnum, _prev_nb_text)
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if s:starts_with(a:text, '\%(\]\|}\|)\)', a:lnum)
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let pair_lnum = searchpair('\%(\[\|{\|(\)', '', '\%(\]\|}\|)\)', 'bnW', "line('.') == " . line('.') . " || elixir#indent#searchpair_back_skip()")
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return indent(pair_lnum)
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else
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return -1
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endif
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endfunction
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function! elixir#indent#handle_starts_with_binary_operator(lnum, text, prev_nb_lnum, prev_nb_text)
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let binary_operator = '\%(=\|<>\|>>>\|<=\|||\|+\|\~\~\~\|-\|&&\|<<<\|/\|\^\^\^\|\*\)'
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if s:starts_with(a:text, binary_operator, a:lnum)
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let match_operator = '\%(!\|=\|<\|>\)\@<!=\%(=\|>\|\~\)\@!'
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let pos = s:find_last_pos(a:prev_nb_lnum, a:prev_nb_text, match_operator)
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if pos == -1
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return indent(a:prev_nb_lnum)
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else
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let next_word_pos = match(strpart(a:prev_nb_text, pos+1, len(a:prev_nb_text)-1), '\S')
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if next_word_pos == -1
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return indent(a:prev_nb_lnum) + s:sw()
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else
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return pos + 1 + next_word_pos
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end
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end
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else
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return -1
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endif
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endfunction
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" To handle nested structures properly we need to find the innermost
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" nested structure. For example, we might be in a function in a map in a
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" function, etc... so we need to first figure out what the innermost structure
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" is then forward execution to the proper handler
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function! elixir#indent#handle_inside_nested_construct(lnum, text, prev_nb_lnum, prev_nb_text)
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let start_pattern = '\C\%(\<with\>\|\<if\>\|\<case\>\|\<cond\>\|\<try\>\|\<receive\>\|\<fn\>\|{\|\[\|(\)'
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let end_pattern = '\C\%(\<end\>\|\]\|}\|)\)'
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let pair_info = searchpairpos(start_pattern, '', end_pattern, 'bnW', "line('.') == " . line('.') . " || elixir#indent#searchpair_back_skip()", max([0, a:lnum - g:elixir_indent_max_lookbehind]))
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let pair_lnum = pair_info[0]
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let pair_col = pair_info[1]
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if pair_lnum != 0 || pair_col != 0
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let pair_text = getline(pair_lnum)
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let pair_char = pair_text[pair_col - 1]
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if pair_char == 'f'
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call s:debug("testing s:do_handle_inside_fn")
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return s:do_handle_inside_fn(pair_lnum, pair_col, a:lnum, a:text, a:prev_nb_lnum, a:prev_nb_text)
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elseif pair_char == '['
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call s:debug("testing s:do_handle_inside_square_brace")
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return s:do_handle_inside_square_brace(pair_lnum, pair_col, a:lnum, a:text, a:prev_nb_lnum, a:prev_nb_text)
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elseif pair_char == '{'
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call s:debug("testing s:do_handle_inside_curly_brace")
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return s:do_handle_inside_curly_brace(pair_lnum, pair_col, a:lnum, a:text, a:prev_nb_lnum, a:prev_nb_text)
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elseif pair_char == '('
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call s:debug("testing s:do_handle_inside_parens")
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return s:do_handle_inside_parens(pair_lnum, pair_col, a:lnum, a:text, a:prev_nb_lnum, a:prev_nb_text)
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elseif pair_char == 'w'
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call s:debug("testing s:do_handle_inside_with")
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return s:do_handle_inside_with(pair_lnum, pair_col, a:lnum, a:text, a:prev_nb_lnum, a:prev_nb_text)
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else
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call s:debug("testing s:do_handle_inside_keyword_block")
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return s:do_handle_inside_keyword_block(pair_lnum, pair_col, a:lnum, a:text, a:prev_nb_lnum, a:prev_nb_text)
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end
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else
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return -1
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end
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endfunction
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function! s:do_handle_inside_with(pair_lnum, pair_col, lnum, text, prev_nb_lnum, prev_nb_text)
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if a:pair_lnum == a:lnum
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" This is the `with` line or an inline `with`/`do`
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call s:debug("current line is `with`")
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return -1
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else
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" Determine if in with/do, do/else|end, or else/end
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let start_pattern = '\C\%(\<with\>\|\<else\>\|\<do\>\)'
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let end_pattern = '\C\%(\<end\>\)'
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let pair_info = searchpairpos(start_pattern, '', end_pattern, 'bnW', "line('.') == " . line('.') . " || elixir#indent#searchpair_back_skip()")
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let pair_lnum = pair_info[0]
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let pair_col = pair_info[1]
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let pair_text = getline(pair_lnum)
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let pair_char = pair_text[pair_col - 1]
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if s:starts_with(a:text, '\Cdo:', a:lnum)
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call s:debug("current line is do:")
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return pair_col - 1 + s:sw()
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elseif s:starts_with(a:text, '\Celse:', a:lnum)
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call s:debug("current line is else:")
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return pair_col - 1
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elseif s:starts_with(a:text, '\C\(\<do\>\|\<else\>\)', a:lnum)
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call s:debug("current line is do/else")
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return pair_col - 1
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elseif s:starts_with(pair_text, '\C\(do\|else\):', pair_lnum)
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call s:debug("inside do:/else:")
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return pair_col - 1 + s:sw()
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elseif pair_char == 'w'
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call s:debug("inside with/do")
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return pair_col + 4
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elseif pair_char == 'd'
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call s:debug("inside do/else|end")
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return pair_col - 1 + s:sw()
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else
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call s:debug("inside else/end")
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return s:do_handle_inside_pattern_match_block(pair_lnum, a:text, a:prev_nb_lnum, a:prev_nb_text)
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end
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end
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endfunction
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function! s:do_handle_inside_keyword_block(pair_lnum, _pair_col, _lnum, text, prev_nb_lnum, prev_nb_text)
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let keyword_pattern = '\C\%(\<case\>\|\<cond\>\|\<try\>\|\<receive\>\|\<after\>\|\<catch\>\|\<rescue\>\|\<else\>\)'
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if a:pair_lnum
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" last line is a "receive" or something
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if s:starts_with(a:prev_nb_text, keyword_pattern, a:prev_nb_lnum)
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call s:debug("prev nb line is keyword")
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return indent(a:prev_nb_lnum) + s:sw()
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else
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return s:do_handle_inside_pattern_match_block(a:pair_lnum, a:text, a:prev_nb_lnum, a:prev_nb_text)
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end
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else
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return -1
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endif
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endfunction
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" Implements indent for pattern-matching blocks (e.g. case, fn, with/else)
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function! s:do_handle_inside_pattern_match_block(block_start_lnum, text, prev_nb_lnum, prev_nb_text)
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if a:text =~ '->'
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call s:debug("current line contains ->")
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return indent(a:block_start_lnum) + s:sw()
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elseif a:prev_nb_text =~ '->'
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call s:debug("prev nb line contains ->")
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return indent(a:prev_nb_lnum) + s:sw()
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else
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return indent(a:prev_nb_lnum)
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end
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endfunction
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function! s:do_handle_inside_fn(pair_lnum, _pair_col, lnum, text, prev_nb_lnum, prev_nb_text)
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if a:pair_lnum && a:pair_lnum != a:lnum
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return s:do_handle_inside_pattern_match_block(a:pair_lnum, a:text, a:prev_nb_lnum, a:prev_nb_text)
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else
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return -1
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endif
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endfunction
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function! s:do_handle_inside_square_brace(pair_lnum, pair_col, _lnum, _text, _prev_nb_lnum, _prev_nb_text)
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|
" If in list...
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|
if a:pair_lnum != 0 || a:pair_col != 0
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|
let pair_text = getline(a:pair_lnum)
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let substr = strpart(pair_text, a:pair_col, len(pair_text)-1)
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|
let indent_pos = match(substr, '\S')
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if indent_pos != -1
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|
return indent_pos + a:pair_col
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else
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return indent(a:pair_lnum) + s:sw()
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endif
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else
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|
return -1
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|
end
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endfunction
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|
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function! s:do_handle_inside_curly_brace(pair_lnum, _pair_col, _lnum, _text, _prev_nb_lnum, _prev_nb_text)
|
|
return indent(a:pair_lnum) + s:sw()
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|
endfunction
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|
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function! s:do_handle_inside_parens(pair_lnum, pair_col, _lnum, _text, prev_nb_lnum, prev_nb_text)
|
|
if a:pair_lnum
|
|
if s:ends_with(a:prev_nb_text, '(', a:prev_nb_lnum)
|
|
return indent(a:prev_nb_lnum) + s:sw()
|
|
elseif a:pair_lnum == a:prev_nb_lnum
|
|
" Align indent (e.g. "def add(a,")
|
|
let pos = s:find_last_pos(a:prev_nb_lnum, a:prev_nb_text, '[^(]\+,')
|
|
if pos == -1
|
|
return 0
|
|
else
|
|
return pos
|
|
end
|
|
else
|
|
return indent(a:prev_nb_lnum)
|
|
end
|
|
else
|
|
return -1
|
|
endif
|
|
endfunction
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|
|
|
function! elixir#indent#handle_inside_generic_block(lnum, _text, prev_nb_lnum, prev_nb_text)
|
|
let pair_lnum = searchpair(s:keyword('do\|fn'), '', s:keyword('end'), 'bW', "line('.') == ".a:lnum." || s:is_string_or_comment(line('.'), col('.'))", max([0, a:lnum - g:elixir_indent_max_lookbehind]))
|
|
if pair_lnum
|
|
" TODO: @jbodah 2017-03-29: this should probably be the case in *all*
|
|
" blocks
|
|
if s:ends_with(a:prev_nb_text, ',', a:prev_nb_lnum)
|
|
return indent(pair_lnum) + 2 * s:sw()
|
|
else
|
|
return indent(pair_lnum) + s:sw()
|
|
endif
|
|
else
|
|
return -1
|
|
endif
|
|
endfunction
|
|
|
|
endif
|