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//usr/share/vim/vim74/indent/pascal.vim

" Vim indent file
" Language:    Pascal
" Maintainer:  Neil Carter <n.carter@swansea.ac.uk>
" Created:     2004 Jul 13
" Last Change: 2011 Apr 01
"
" This is version 2.0, a complete rewrite.
"
" For further documentation, see http://psy.swansea.ac.uk/staff/carter/vim/

if exists("b:did_indent")
	finish
endif
let b:did_indent = 1

setlocal indentexpr=GetPascalIndent(v:lnum)
setlocal indentkeys&
setlocal indentkeys+==end;,==const,==type,==var,==begin,==repeat,==until,==for
setlocal indentkeys+==program,==function,==procedure,==object,==private
setlocal indentkeys+==record,==if,==else,==case

if exists("*GetPascalIndent")
	finish
endif

function! s:GetPrevNonCommentLineNum( line_num )

" Skip lines starting with a comment
	let SKIP_LINES = '^\s*$\((\*$\|$\*\ $\|$\*)$\|{\|}\)'

let nline = a:line_num
	while nline > 0
		let nline = prevnonblank(nline-1)
		if getline(nline) !~? SKIP_LINES
			break
		endif
	endwhile

return nline
endfunction

function! s:PurifyCode( line_num )
	" Strip any trailing comments and whitespace
	let pureline = 'TODO'
	return pureline
endfunction

function! GetPascalIndent( line_num )

" Line 0 always goes at column 0
	if a:line_num == 0
		return 0
	endif

let this_codeline = getline( a:line_num )

" SAME INDENT

" Middle of a three-part comment
	if this_codeline =~ '^\s*\*'
		return indent( a:line_num - 1)
	endif

" COLUMN 1 ALWAYS

" Last line of the program
	if this_codeline =~ '^\s*end\.'
		return 0
	endif

" Compiler directives, allowing "(*" and "{"
	"if this_codeline =~ '^\s*${\|(\*$$$IFDEF\|IFNDEF\|ELSE\|ENDIF$'
	if this_codeline =~ '^\s*${\|(\*$\$'
		return 0
	endif

" section headers
	if this_codeline =~ '^\s*$program\|procedure\|function\|type$\>'
		return 0
	endif

" Subroutine separators, lines ending with "const" or "var"
	if this_codeline =~ '^\s*$(\*\ _\+\ \*)\|\(const\|var$\)$'
		return 0
	endif

" OTHERWISE, WE NEED TO LOOK FURTHER BACK...

let prev_codeline_num = s:GetPrevNonCommentLineNum( a:line_num )
	let prev_codeline = getline( prev_codeline_num )
	let indnt = indent( prev_codeline_num )

" INCREASE INDENT

" If the PREVIOUS LINE ended in these items, always indent
	if prev_codeline =~ '\<$type\|const\|var$$'
		return indnt + &shiftwidth
	endif

if prev_codeline =~ '\<repeat$'
		if this_codeline !~ '^\s*until\>'
			return indnt + &shiftwidth
		else
			return indnt
		endif
	endif

if prev_codeline =~ '\<$begin\|record$$'
		if this_codeline !~ '^\s*end\>'
			return indnt + &shiftwidth
		else
			return indnt
		endif
	endif

" If the PREVIOUS LINE ended with these items, indent if not
	" followed by "begin"
	if prev_codeline =~ '\<$\|else\|then\|do$$' || prev_codeline =~ ':$'
		if this_codeline !~ '^\s*begin\>'
			return indnt + &shiftwidth
		else
			" If it does start with "begin" then keep the same indent
			"return indnt + &shiftwidth
			return indnt
		endif
	endif

" Inside a parameter list (i.e. a "(" without a ")"). ???? Considers
	" only the line before the current one. TODO: Get it working for
	" parameter lists longer than two lines.
	if prev_codeline =~ '([^)]\+$'
		return indnt + &shiftwidth
	endif

" DECREASE INDENT

" Lines starting with "else", but not following line ending with
	" "end".
	if this_codeline =~ '^\s*else\>' && prev_codeline !~ '\<end$'
		return indnt - &shiftwidth
	endif

" Lines after a single-statement branch/loop.
	" Two lines before ended in "then", "else", or "do"
	" Previous line didn't end in "begin"
	let prev2_codeline_num = s:GetPrevNonCommentLineNum( prev_codeline_num )
	let prev2_codeline = getline( prev2_codeline_num )
	if prev2_codeline =~ '\<$then\|else\|do$$' && prev_codeline !~ '\<begin$'
		" If the next code line after a single statement branch/loop
		" starts with "end", "except" or "finally", we need an
		" additional unindentation.
		if this_codeline =~ '^\s*$end;\|except\|finally\|$$'
			" Note that we don't return from here.
			return indnt - &shiftwidth - &shiftwidth
		endif
		return indnt - &shiftwidth
	endif

" Lines starting with "until" or "end". This rule must be overridden
	" by the one for "end" after a single-statement branch/loop. In
	" other words that rule should come before this one.
	if this_codeline =~ '^\s*$end\|until$\>'
		return indnt - &shiftwidth
	endif

" MISCELLANEOUS THINGS TO CATCH

" Most "begin"s will have been handled by now. Any remaining
	" "begin"s on their own line should go in column 1.
	if this_codeline =~ '^\s*begin$'
		return 0
	endif

" ____________________________________________________________________
" Object/Borland Pascal/Delphi Extensions
"
" Note that extended-pascal is handled here, unless it is simpler to
" handle them in the standard-pascal section above.

" COLUMN 1 ALWAYS

" section headers at start of line.
	if this_codeline =~ '^\s*$interface\|implementation\|uses\|unit$\>'
		return 0
	endif

" INDENT ONCE

" ???? Indent "procedure" and "functions" if they appear within an
	" class/object definition. But that means overriding standard-pascal
	" rule where these words always go in column 1.

" UNINDENT ONCE

if this_codeline =~ '^\s*$except\|finally$$'
		return indnt - &shiftwidth
	endif

if this_codeline =~ '^\s*$private\|protected\|public\|published$$'
		return indnt - &shiftwidth
	endif

" ____________________________________________________________________

" If nothing changed, return same indent.
	return indnt
endfunction