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Diffstat (limited to 'runtime/indent/ada.vim')
| -rw-r--r-- | runtime/indent/ada.vim | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/runtime/indent/ada.vim b/runtime/indent/ada.vim new file mode 100644 index 000000000..72e2e80e5 --- /dev/null +++ b/runtime/indent/ada.vim @@ -0,0 +1,264 @@ +" Vim indent file +" Language: Ada +" Maintainer: Neil Bird <neil@fnxweb.com> +" Last Change: 2003 May 20 +" Version: $Id$ +" Look for the latest version at http://vim.sourceforge.net/ +" +" ToDo: +" Verify handling of multi-line exprs. and recovery upon the final ';'. +" Correctly find comments given '"' and "" ==> " syntax. +" Combine the two large block-indent functions into one? + +" Only load this indent file when no other was loaded. +if exists("b:did_indent") + finish +endif +let b:did_indent = 1 + +setlocal indentexpr=GetAdaIndent() +setlocal indentkeys-=0{,0} +setlocal indentkeys+=0=~then,0=~end,0=~elsif,0=~when,0=~exception,0=~begin,0=~is,0=~record + +" Only define the functions once. +if exists("*GetAdaIndent") + finish +endif + +let s:AdaBlockStart = '^\s*\(if\>\|while\>\|else\>\|elsif\>\|loop\>\|for\>.*\<loop\>\|declare\>\|begin\>\|type\>.*\<is\s*$\|\(type\>.*\)\=\<record\>\|procedure\>\|function\>\|accept\>\|do\>\|task\>\|package\>\|then\>\|when\>\|is\>\)' +let s:AdaComment = "\\v^(\"[^\"]*\"|'.'|[^\"']){-}\\zs\\s*--.*" + + +" Try to find indent of the block we're in (and about to complete) +" prev_indent = the previous line's indent +" prev_lnum = previous line (to start looking on) +" blockstart = expr. that indicates a possible start of this block +" stop_at = if non-null, if a matching line is found, gives up! +" No recursive previous block analysis: simply look for a valid line +" with a lesser or equal indent than we currently (on prev_lnum) have. +" This shouldn't work as well as it appears to with lines that are currently +" nowhere near the correct indent (e.g., start of line)! +" Seems to work OK as it 'starts' with the indent of the /previous/ line. +function s:MainBlockIndent( prev_indent, prev_lnum, blockstart, stop_at ) + let lnum = a:prev_lnum + let line = substitute( getline(lnum), s:AdaComment, '', '' ) + while lnum > 1 + if a:stop_at != '' && line =~ '^\s*' . a:stop_at && indent(lnum) < a:prev_indent + return -1 + elseif line =~ '^\s*' . a:blockstart + let ind = indent(lnum) + if ind < a:prev_indent + return ind + endif + endif + + let lnum = prevnonblank(lnum - 1) + " Get previous non-blank/non-comment-only line + while 1 + let line = substitute( getline(lnum), s:AdaComment, '', '' ) + if line !~ '^\s*$' && line !~ '^\s*#' + break + endif + let lnum = prevnonblank(lnum - 1) + if lnum <= 0 + return a:prev_indent + endif + endwhile + endwhile + " Fallback - just move back one + return a:prev_indent - &sw +endfunction + +" Try to find indent of the block we're in (and about to complete), +" including handling of nested blocks. Works on the 'end' of a block. +" prev_indent = the previous line's indent +" prev_lnum = previous line (to start looking on) +" blockstart = expr. that indicates a possible start of this block +" blockend = expr. that indicates a possible end of this block +function s:EndBlockIndent( prev_indent, prev_lnum, blockstart, blockend ) + let lnum = a:prev_lnum + let line = getline(lnum) + let ends = 0 + while lnum > 1 + if getline(lnum) =~ '^\s*' . a:blockstart + let ind = indent(lnum) + if ends <= 0 + if ind < a:prev_indent + return ind + endif + else + let ends = ends - 1 + endif + elseif getline(lnum) =~ '^\s*' . a:blockend + let ends = ends + 1 + endif + + let lnum = prevnonblank(lnum - 1) + " Get previous non-blank/non-comment-only line + while 1 + let line = getline(lnum) + let line = substitute( line, s:AdaComment, '', '' ) + if line !~ '^\s*$' + break + endif + let lnum = prevnonblank(lnum - 1) + if lnum <= 0 + return a:prev_indent + endif + endwhile + endwhile + " Fallback - just move back one + return a:prev_indent - &sw +endfunction + +" As per MainBlockIndent, but return indent of previous statement-start +" (after we've indented due to multi-line statements). +" This time, we start searching on the line *before* the one given (which is +" the end of a statement - we want the previous beginning). +function s:StatementIndent( current_indent, prev_lnum ) + let lnum = a:prev_lnum + while lnum > 0 + let prev_lnum = lnum + let lnum = prevnonblank(lnum - 1) + " Get previous non-blank/non-comment-only line + while 1 + let line = substitute( getline(lnum), s:AdaComment, '', '' ) + if line !~ '^\s*$' && line !~ '^\s*#' + break + endif + let lnum = prevnonblank(lnum - 1) + if lnum <= 0 + return a:current_indent + endif + endwhile + " Leave indent alone if our ';' line is part of a ';'-delineated + " aggregate (e.g., procedure args.) or first line after a block start. + if line =~ s:AdaBlockStart || line =~ '(\s*$' + return a:current_indent + endif + if line !~ '[.=(]\s*$' + let ind = indent(prev_lnum) + if ind < a:current_indent + return ind + endif + endif + endwhile + " Fallback - just use current one + return a:current_indent +endfunction + + +" Find correct indent of a new line based upon what went before +function GetAdaIndent() + " Find a non-blank line above the current line. + let lnum = prevnonblank(v:lnum - 1) + let ind = indent(lnum) + let package_line = 0 + + " Get previous non-blank/non-comment-only/non-cpp line + while 1 + let line = substitute( getline(lnum), s:AdaComment, '', '' ) + if line !~ '^\s*$' && line !~ '^\s*#' + break + endif + let lnum = prevnonblank(lnum - 1) + if lnum <= 0 + return ind + endif + endwhile + + " Get default indent (from prev. line) + let ind = indent(lnum) + + " Now check what's on the previous line + if line =~ s:AdaBlockStart || line =~ '(\s*$' + " Check for false matches to AdaBlockStart + let false_match = 0 + if line =~ '^\s*\(procedure\|function\|package\)\>.*\<is\s*new\>' + " Generic instantiation + let false_match = 1 + elseif line =~ ')\s*;\s*$' || line =~ '^\([^(]*([^)]*)\)*[^(]*;\s*$' + " forward declaration + let false_match = 1 + endif + " Move indent in + if ! false_match + let ind = ind + &sw + endif + elseif line =~ '^\s*\(case\|exception\)\>' + " Move indent in twice (next 'when' will move back) + let ind = ind + 2 * &sw + elseif line =~ '^\s*end\s*record\>' + " Move indent back to tallying 'type' preceeding the 'record'. + " Allow indent to be equal to 'end record's. + let ind = s:MainBlockIndent( ind+&sw, lnum, 'type\>', '' ) + elseif line =~ '\(^\s*new\>.*\)\@<!)\s*[;,]\s*$' + " Revert to indent of line that started this parenthesis pair + exe lnum + exe 'normal! $F)%' + if getline('.') =~ '^\s*(' + " Dire layout - use previous indent (could check for AdaComment here) + let ind = indent( prevnonblank( line('.')-1 ) ) + else + let ind = indent('.') + endif + exe v:lnum + elseif line =~ '[.=(]\s*$' + " A statement continuation - move in one + let ind = ind + &sw + elseif line =~ '^\s*new\>' + " Multiple line generic instantiation ('package blah is\nnew thingy') + let ind = s:StatementIndent( ind - &sw, lnum ) + elseif line =~ ';\s*$' + " Statement end - try to find current statement-start indent + let ind = s:StatementIndent( ind, lnum ) + endif + + " Check for potential argument list on next line + let continuation = (line =~ '[A-Za-z0-9_]\s*$') + + + " Check current line; search for simplistic matching start-of-block + let line = getline(v:lnum) + if line =~ '^\s*#' + " Start of line for ada-pp + let ind = 0 + elseif continuation && line =~ '^\s*(' + let ind = ind + &sw + elseif line =~ '^\s*\(begin\|is\)\>' + let ind = s:MainBlockIndent( ind, lnum, '\(procedure\|function\|declare\|package\|task\)\>', 'begin\>' ) + elseif line =~ '^\s*record\>' + let ind = s:MainBlockIndent( ind, lnum, 'type\>', '' ) + &sw + elseif line =~ '^\s*\(else\|elsif\)\>' + let ind = s:MainBlockIndent( ind, lnum, 'if\>', '' ) + elseif line =~ '^\s*when\>' + " Align 'when' one /in/ from matching block start + let ind = s:MainBlockIndent( ind, lnum, '\(case\|exception\)\>', '' ) + &sw + elseif line =~ '^\s*end\>\s*\<if\>' + " End of if statements + let ind = s:EndBlockIndent( ind, lnum, 'if\>', 'end\>\s*\<if\>' ) + elseif line =~ '^\s*end\>\s*\<loop\>' + " End of loops + let ind = s:EndBlockIndent( ind, lnum, '\(\(while\|for\)\>.*\)\?\<loop\>', 'end\>\s*\<loop\>' ) + elseif line =~ '^\s*end\>\s*\<record\>' + " End of records + let ind = s:EndBlockIndent( ind, lnum, '\(type\>.*\)\=\<record\>', 'end\>\s*\<record\>' ) + elseif line =~ '^\s*end\>\s*\<procedure\>' + " End of procedures + let ind = s:EndBlockIndent( ind, lnum, 'procedure\>.*\<is\>', 'end\>\s*\<procedure\>' ) + elseif line =~ '^\s*end\>\s*\<case\>' + " End of case statement + let ind = s:EndBlockIndent( ind, lnum, 'case\>.*\<is\>', 'end\>\s*\<case\>' ) + elseif line =~ '^\s*end\>' + " General case for end + let ind = s:MainBlockIndent( ind, lnum, '\(if\|while\|for\|loop\|accept\|begin\|record\|case\|exception\)\>', '' ) + elseif line =~ '^\s*exception\>' + let ind = s:MainBlockIndent( ind, lnum, 'begin\>', '' ) + elseif line =~ '^\s*then\>' + let ind = s:MainBlockIndent( ind, lnum, 'if\>', '' ) + endif + + return ind +endfunction + +" vim: set sw=3 sts=3 : |