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Diffstat (limited to 'runtime/indent/erlang.vim')
| -rw-r--r-- | runtime/indent/erlang.vim | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/runtime/indent/erlang.vim b/runtime/indent/erlang.vim new file mode 100644 index 000000000..5ce3f82e0 --- /dev/null +++ b/runtime/indent/erlang.vim @@ -0,0 +1,206 @@ +" Vim indent file +" Language: Erlang +" Maintainer: Csaba Hoch <csaba.hoch@gmail.com> +" Contributor: Edwin Fine <efine145_nospam01 at usa dot net> +" Last Change: 2008 Mar 12 + +" Only load this indent file when no other was loaded. +if exists("b:did_indent") + finish +endif +let b:did_indent = 1 + +setlocal indentexpr=ErlangIndent() +setlocal indentkeys+==after,=end,=catch,=),=],=} + +" Only define the functions once. +if exists("*ErlangIndent") + finish +endif + +" The function go through the whole line, analyses it and sets the indentation +" (ind variable). +" l: the number of the line to be examined. +function s:ErlangIndentAtferLine(l) + let i = 0 " the index of the current character in the line + let length = strlen(a:l) " the length of 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 lastFun = 0 " the last token was a 'fun' + let lastReceive = 0 " the last token was a 'receive'; needed for 'after' + let lastHashMark = 0 " the last token was a 'hashmark' + + while 0<= i && i < length + + " m: the next value of the i + if a:l[i] == '%' + break + elseif a:l[i] == '"' + let m = matchend(a:l,'"\%([^"\\]\|\\.\)*"',i) + let lastReceive = 0 + elseif a:l[i] == "'" + let m = matchend(a:l,"'[^']*'",i) + let lastReceive = 0 + elseif a:l[i] =~# "[a-z]" + let m = matchend(a:l,".[[:alnum:]_]*",i) + if lastFun + let ind = ind - 1 + let lastFun = 0 + let lastReceive = 0 + elseif a:l[(i):(m-1)] =~# '^\%(case\|if\|try\)$' + let ind = ind + 1 + elseif a:l[(i):(m-1)] =~# '^receive$' + let ind = ind + 1 + let lastReceive = 1 + elseif a:l[(i):(m-1)] =~# '^begin$' + let ind = ind + 2 + let lastReceive = 0 + elseif a:l[(i):(m-1)] =~# '^end$' + let ind = ind - 2 + let lastReceive = 0 + elseif a:l[(i):(m-1)] =~# '^after$' + if lastReceive == 0 + let ind = ind - 1 + else + let ind = ind + 0 + end + let lastReceive = 0 + elseif a:l[(i):(m-1)] =~# '^fun$' + let ind = ind + 1 + let lastFun = 1 + let lastReceive = 0 + endif + elseif a:l[i] =~# "[A-Z_]" + let m = matchend(a:l,".[[:alnum:]_]*",i) + let lastReceive = 0 + elseif a:l[i] == '$' + let m = i+2 + let lastReceive = 0 + elseif a:l[i] == "." && (i+1>=length || a:l[i+1]!~ "[0-9]") + let m = i+1 + if lastHashMark + let lastHashMark = 0 + else + let ind = ind - 1 + end + let lastReceive = 0 + elseif a:l[i] == '-' && (i+1<length && a:l[i+1]=='>') + let m = i+2 + let ind = ind + 1 + let lastReceive = 0 + elseif a:l[i] == ';' + let m = i+1 + let ind = ind - 1 + let lastReceive = 0 + elseif a:l[i] == '#' + let m = i+1 + let lastHashMark = 1 + elseif a:l[i] =~# '[({[]' + let m = i+1 + let ind = ind + 1 + let lastFun = 0 + let lastReceive = 0 + let lastHashMark = 0 + elseif a:l[i] =~# '[)}\]]' + let m = i+1 + let ind = ind - 1 + let lastReceive = 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 + +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 = indent(lnum) + &sw * s:ErlangIndentAtferLine(prevline) + + " 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*\%(%.*\)\=$' + let ind = ind - 1*&sw + " If the 'receive' is not in the same line as the 'after' + 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 + +" TODO: +" +" f() -> +" x("foo +" bar") +" , +" bad_indent. +" +" fun +" init/0, +" bad_indent +" +" #rec +" .field, +" bad_indent +" +" case X of +" 1 when A; B -> +" bad_indent + |