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" Vim indent file
" Language: Pascal
" Maintainer: Neil Carter <n.carter@swansea.ac.uk>
" Created: 2004 Jul 13
" Last Change: 2021 Sep 22
"
" For further documentation, see https://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
let b:undo_indent = 'setlocal indentexpr< indentkeys<'
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 - 2 * 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
" If the PREVIOUS LINE ended in these items, always indent.
if prev_codeline =~ '^\s*\(unit\|uses\|try\|except\|finally\|private\|protected\|public\|published\)$'
return indnt + shiftwidth()
endif
" ???? 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
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