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Editing: verilog.vim

" Language:     Verilog HDL
" Maintainer:	Chih-Tsun Huang <cthuang@cs.nthu.edu.tw>
" Last Change:	2017 Aug 25 by Chih-Tsun Huang
" URL:		    http://www.cs.nthu.edu.tw/~cthuang/vim/indent/verilog.vim
"
" Credits:
"   Suggestions for improvement, bug reports by
"     Takuya Fujiwara <tyru.exe@gmail.com>
"     Thilo Six <debian@Xk2c.de>
"     Leo Butlero <lbutler@brocade.com>
"
" Buffer Variables:
"     b:verilog_indent_modules : indenting after the declaration
"				 of module blocks
"     b:verilog_indent_width   : indenting width
"     b:verilog_indent_verbose : verbose to each indenting
"

" Only load this indent file when no other was loaded.
if exists("b:did_indent")
  finish
endif
let b:did_indent = 1

setlocal indentexpr=GetVerilogIndent()
setlocal indentkeys=!^F,o,O,0),=begin,=end,=join,=endcase
setlocal indentkeys+==endmodule,=endfunction,=endtask,=endspecify
setlocal indentkeys+==endconfig,=endgenerate,=endprimitive,=endtable
setlocal indentkeys+==`else,=`elsif,=`endif

" Only define the function once.
if exists("*GetVerilogIndent")
  finish
endif

let s:cpo_save = &cpo
set cpo&vim

function GetVerilogIndent()

if exists('b:verilog_indent_width')
    let offset = b:verilog_indent_width
  else
    let offset = shiftwidth()
  endif
  if exists('b:verilog_indent_modules')
    let indent_modules = offset
  else
    let indent_modules = 0
  endif

" Find a non-blank line above the current line.
  let lnum = prevnonblank(v:lnum - 1)

" At the start of the file use zero indent.
  if lnum == 0
    return 0
  endif

let lnum2 = prevnonblank(lnum - 1)
  let curr_line  = getline(v:lnum)
  let last_line  = getline(lnum)
  let last_line2 = getline(lnum2)
  let ind  = indent(lnum)
  let ind2 = indent(lnum - 1)
  let offset_comment1 = 1
  " Define the condition of an open statement
  "   Exclude the match of //, /* or */
  let vlog_openstat = '$\<or\>\|\([*/]$\@<![*(,{><+-/%^&|!=?:]$[*/]$\@!\)'
  " Define the condition when the statement ends with a one-line comment
  let vlog_comment = '$//.*\|/\*.*\*/\s*$'
  if exists('b:verilog_indent_verbose')
    let vverb_str = 'INDENT VERBOSE:'
    let vverb = 1
  else
    let vverb = 0
  endif

" Indent accoding to last line
  " End of multiple-line comment
  if last_line =~ '\*/\s*$' && last_line !~ '/\*.\{-}\*/'
    let ind = ind - offset_comment1
    if vverb
      echo vverb_str "De-indent after a multiple-line comment."
    endif

" Indent after if/else/for/case/always/initial/specify/fork blocks
  " Note: We exclude '`if' or '`else' and consider 'end else' 
  "       'end if' is redundant here
  elseif last_line =~ '^\s*$end$\=\s*`\@<!\<$if\|else$\>' ||
    \ last_line =~ '^\s*\<$for\|case\%[[zx]]$\>' ||
    \ last_line =~ '^\s*\<$always\|initial$\>' ||
    \ last_line =~ '^\s*\<$specify\|fork$\>'
    if last_line !~ '$;\|\<end\>$\s*' . vlog_comment . '*$' ||
      \ last_line =~ '$//\|/\*$.*$;\|\<end\>$\s*' . vlog_comment . '*$'
      let ind = ind + offset
      if vverb | echo vverb_str "Indent after a block statement." | endif
    endif
  " Indent after function/task/config/generate/primitive/table blocks
  elseif last_line =~ '^\s*\<$function\|task\|config\|generate\|primitive\|table$\>'
    if last_line !~ '\<end\>\s*' . vlog_comment . '*$' ||
      \ last_line =~ '$//\|/\*$.*$;\|\<end\>$\s*' . vlog_comment . '*$'
      let ind = ind + offset
      if vverb
	echo vverb_str "Indent after function/task block statement."
      endif
    endif

" Indent after module/function/task/specify/fork blocks
  elseif last_line =~ '^\s*\<module\>'
    let ind = ind + indent_modules
    if vverb && indent_modules
      echo vverb_str "Indent after module statement."
    endif
    if last_line =~ '[(,]\s*' . vlog_comment . '*$' &&
      \ last_line !~ '$//\|/\*$.*[(,]\s*' . vlog_comment . '*$'
      let ind = ind + offset
      if vverb
	echo vverb_str "Indent after a multiple-line module statement."
      endif
    endif

" Indent after a 'begin' statement
  elseif last_line =~ '$\<begin\>$$\s*:\s*\w\+$*' . vlog_comment . '*$' &&
    \ last_line !~ '$//\|/\*$.*$\<begin\>$' &&
    \ ( last_line2 !~ vlog_openstat . '\s*' . vlog_comment . '*$' ||
    \ last_line2 =~ '^\s*[^=!]\+\s*:\s*' . vlog_comment . '*$' )
    let ind = ind + offset
    if vverb | echo vverb_str "Indent after begin statement." | endif

" De-indent for the end of one-line block
  elseif ( last_line !~ '\<begin\>' ||
    \ last_line =~ '$//\|/\*$.*\<begin\>' ) &&
    \ last_line2 =~ '\<$`\@<!if\|`\@<!else\|for\|always\|initial$\>.*' .
      \ vlog_comment . '*$' &&
    \ last_line2 !~
      \ '$//\|/\*$.*\<$`\@<!if\|`\@<!else\|for\|always\|initial$\>' &&
    \ last_line2 !~ vlog_openstat . '\s*' . vlog_comment . '*$' &&
    \ ( last_line2 !~ '\<begin\>' ||
    \ last_line2 =~ '$//\|/\*$.*\<begin\>' )
    let ind = ind - offset
    if vverb
      echo vverb_str "De-indent after the end of one-line statement."
    endif

" Multiple-line statement (including case statement)
    " Open statement
    "   Ident the first open line
    elseif  last_line =~ vlog_openstat . '\s*' . vlog_comment . '*$' &&
      \ last_line !~ '$//\|/\*$.*' . vlog_openstat . '\s*$' &&
      \ last_line2 !~ vlog_openstat . '\s*' . vlog_comment . '*$'
      let ind = ind + offset
      if vverb | echo vverb_str "Indent after an open statement." | endif

" Close statement
    "   De-indent for an optional close parenthesis and a semicolon, and only
    "   if there exists precedent non-whitespace char
    elseif last_line =~ ')*\s*;\s*' . vlog_comment . '*$' &&
      \ last_line !~ '^\s*)*\s*;\s*' . vlog_comment . '*$' &&
      \ last_line !~ '$//\|/\*$.*\S)*\s*;\s*' . vlog_comment . '*$' &&
      \ ( last_line2 =~ vlog_openstat . '\s*' . vlog_comment . '*$' &&
      \ last_line2 !~ ';\s*//.*$') &&
      \ last_line2 !~ '^\s*' . vlog_comment . '$'
      let ind = ind - offset
      if vverb | echo vverb_str "De-indent after a close statement." | endif

" `ifdef or `ifndef or `elsif or `else
  elseif last_line =~ '^\s*`\<$ifn\?def\|elsif\|else$\>'
    let ind = ind + offset
    if vverb
      echo vverb_str "Indent after a `ifdef or `ifndef or `elsif or `else statement."
    endif

endif

" Re-indent current line

" De-indent on the end of the block
  " join/end/endcase/endfunction/endtask/endspecify
  if curr_line =~ '^\s*\<$join\|end\|endcase$\>' ||
    \ curr_line =~ '^\s*\<$endfunction\|endtask\|endspecify$\>' ||
    \ curr_line =~ '^\s*\<$endconfig\|endgenerate\|endprimitive\|endtable$\>'
    let ind = ind - offset
    if vverb | echo vverb_str "De-indent the end of a block." | endif
  elseif curr_line =~ '^\s*\<endmodule\>'
    let ind = ind - indent_modules
    if vverb && indent_modules
      echo vverb_str "De-indent the end of a module."
    endif

" De-indent on a stand-alone 'begin'
  elseif curr_line =~ '^\s*\<begin\>'
    if last_line !~ '^\s*\<$function\|task\|specify\|module\|config\|generate\|primitive\|table$\>' &&
      \ last_line !~ '^\s*$)*\s*;\|)\+$\s*' . vlog_comment . '*$' &&
      \ ( last_line =~
	\ '\<$`\@<!if\|`\@<!else\|for\|case\%[[zx]]\|always\|initial$\>' ||
      \ last_line =~ ')\s*' . vlog_comment . '*$' ||
      \ last_line =~ vlog_openstat . '\s*' . vlog_comment . '*$' )
      let ind = ind - offset
      if vverb
	echo vverb_str "De-indent a stand alone begin statement."
      endif
    endif

" De-indent after the end of multiple-line statement
  elseif curr_line =~ '^\s*)' &&
    \ ( last_line =~ vlog_openstat . '\s*' . vlog_comment . '*$' ||
    \ last_line !~ vlog_openstat . '\s*' . vlog_comment . '*$' &&
    \ last_line2 =~ vlog_openstat . '\s*' . vlog_comment . '*$' )
    let ind = ind - offset
    if vverb
      echo vverb_str "De-indent the end of a multiple statement."
    endif

" De-indent `elsif or `else or `endif
  elseif curr_line =~ '^\s*`\<$elsif\|else\|endif$\>'
    let ind = ind - offset
    if vverb | echo vverb_str "De-indent `elsif or `else or `endif statement." | endif

endif

" Return the indention
  return ind
endfunction

let &cpo = s:cpo_save
unlet s:cpo_save

" vim:sw=2

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