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" Vim indent file
" Language: Erlang
" Author: Csaba Hoch <csaba.hoch@gmail.com>
" Contributors: Edwin Fine <efine145_nospam01 at usa dot net>
" Pawel 'kTT' Salata <rockplayer.pl@gmail.com>
" Ricardo Catalinas Jiménez <jimenezrick@gmail.com>
" License: Vim license
" Version: 2011/09/06
" Only load this indent file when no other was loaded
if exists("b:did_indent")
finish
else
let b:did_indent = 1
endif
setlocal indentexpr=ErlangIndent()
setlocal indentkeys+==after,=end,=catch,=),=],=}
" Only define the functions once
if exists("*ErlangIndent")
finish
endif
" The function goes through the whole line, analyses it and returns the
" indentation level.
"
" line: the line to be examined
" return: the indentation level of the examined line
function s:ErlangIndentAfterLine(line)
let linelen = strlen(a:line) " the length of the line
let i = 0 " the index of the current character in the line
let ind = 0 " how much should be the difference between the indentation of
" the current line and the indentation of the next line?
" e.g. +1: the indentation of the next line should be equal to
" the indentation of the current line plus one shiftwidth
let last_fun = 0 " the last token was a 'fun'
let last_receive = 0 " the last token was a 'receive'; needed for 'after'
let last_hash_sym = 0 " the last token was a '#'
" Ignore comments
if a:line =~# '^\s*%'
return 0
endif
" Partial function head where the guard is missing
if a:line =~# "\\(^\\l[[:alnum:]_]*\\)\\|\\(^'[^']\\+'\\)(" && a:line !~# '->'
return 2
endif
" The missing guard from the split function head
if a:line =~# '^\s*when\s\+.*->'
return -1
endif
while 0<=i && i<linelen
" m: the next value of the i
if a:line[i] == '"'
let m = matchend(a:line,'"\%([^"\\]\|\\.\)*"',i)
let last_receive = 0
elseif a:line[i] == "'"
let m = matchend(a:line,"'[^']*'",i)
let last_receive = 0
elseif a:line[i] =~# "[a-z]"
let m = matchend(a:line,".[[:alnum:]_]*",i)
if last_fun
let ind = ind - 1
let last_fun = 0
let last_receive = 0
elseif a:line[(i):(m-1)] =~# '^\%(case\|if\|try\)$'
let ind = ind + 1
elseif a:line[(i):(m-1)] =~# '^receive$'
let ind = ind + 1
let last_receive = 1
elseif a:line[(i):(m-1)] =~# '^begin$'
let ind = ind + 2
let last_receive = 0
elseif a:line[(i):(m-1)] =~# '^end$'
let ind = ind - 2
let last_receive = 0
elseif a:line[(i):(m-1)] =~# '^after$'
if last_receive == 0
let ind = ind - 1
else
let ind = ind + 0
endif
let last_receive = 0
elseif a:line[(i):(m-1)] =~# '^fun$'
let ind = ind + 1
let last_fun = 1
let last_receive = 0
endif
elseif a:line[i] =~# "[A-Z_]"
let m = matchend(a:line,".[[:alnum:]_]*",i)
let last_receive = 0
elseif a:line[i] == '$'
let m = i+2
let last_receive = 0
elseif a:line[i] == "." && (i+1>=linelen || a:line[i+1]!~ "[0-9]")
let m = i+1
if last_hash_sym
let last_hash_sym = 0
else
let ind = ind - 1
endif
let last_receive = 0
elseif a:line[i] == '-' && (i+1<linelen && a:line[i+1]=='>')
let m = i+2
let ind = ind + 1
let last_receive = 0
elseif a:line[i] == ';' && a:line[(i):(linelen)] !~# '.*->.*'
let m = i+1
let ind = ind - 1
let last_receive = 0
elseif a:line[i] == '#'
let m = i+1
let last_hash_sym = 1
elseif a:line[i] =~# '[({[]'
let m = i+1
let ind = ind + 1
let last_fun = 0
let last_receive = 0
let last_hash_sym = 0
elseif a:line[i] =~# '[)}\]]'
let m = i+1
let ind = ind - 1
let last_receive = 0
else
let m = i+1
endif
let i = m
endwhile
return ind
endfunction
function s:FindPrevNonBlankNonComment(lnum)
let lnum = prevnonblank(a:lnum)
let line = getline(lnum)
" Continue to search above if the current line begins with a '%'
while line =~# '^\s*%.*$'
let lnum = prevnonblank(lnum - 1)
if 0 == lnum
return 0
endif
let line = getline(lnum)
endwhile
return lnum
endfunction
" The function returns the indentation level of the line adjusted to a mutiple
" of 'shiftwidth' option.
"
" lnum: line number
" return: the indentation level of the line
function s:GetLineIndent(lnum)
return (indent(a:lnum) / &sw) * &sw
endfunction
function ErlangIndent()
" Find a non-blank line above the current line
let lnum = prevnonblank(v:lnum - 1)
" Hit the start of the file, use zero indent
if lnum == 0
return 0
endif
let prevline = getline(lnum)
let currline = getline(v:lnum)
let ind_after = s:ErlangIndentAfterLine(prevline)
if ind_after != 0
let ind = s:GetLineIndent(lnum) + ind_after * &sw
else
let ind = indent(lnum) + ind_after * &sw
endif
" Special cases:
if prevline =~# '^\s*\%(after\|end\)\>'
let ind = ind + 2*&sw
endif
if currline =~# '^\s*end\>'
let ind = ind - 2*&sw
endif
if currline =~# '^\s*after\>'
let plnum = s:FindPrevNonBlankNonComment(v:lnum-1)
if getline(plnum) =~# '^[^%]*\<receive\>\s*\%(%.*\)\=$'
" If the 'receive' is not in the same line as the 'after'
let ind = ind - 1*&sw
else
let ind = ind - 2*&sw
endif
endif
if prevline =~# '^\s*[)}\]]'
let ind = ind + 1*&sw
endif
if currline =~# '^\s*[)}\]]'
let ind = ind - 1*&sw
endif
if prevline =~# '^\s*\%(catch\)\s*\%(%\|$\)'
let ind = ind + 1*&sw
endif
if currline =~# '^\s*\%(catch\)\s*\%(%\|$\)'
let ind = ind - 1*&sw
endif
if ind<0
let ind = 0
endif
return ind
endfunction
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