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simplify extractEBNF code

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R=rsc
DELTA=15  (3 added, 2 deleted, 10 changed)
OCL=34307
CL=34314
This commit is contained in:
Robert Griesemer 2009-09-03 10:53:27 -07:00
parent d3ffc5e683
commit eea6b0d8d5
1 changed files with 13 additions and 12 deletions
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25
src/cmd/ebnflint/ebnflint.go
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@ -38,33 +38,34 @@ var (
func extractEBNF(src []byte) []byte {
var buf bytes.Buffer;
for i, j, n := 0, 0, len(src); ; {
// i = beginning of EBNF section
i = bytes.Index(src[j : n], open);
for {
// i = beginning of EBNF text
i := bytes.Index(src, open);
if i < 0 {
break;
break; // no EBNF found - we are done
}
i += j+len(open);
i += len(open);
// write as many newlines as found in the excluded text
// to maintain correct line numbers in error messages
for _, ch := range src[j : i] {
for _, ch := range src[0 : i] {
if ch == '\n' {
buf.WriteByte('\n');
}
}
// j = end of EBNF section
j = bytes.Index(src[i : n], close);
// j = end of EBNF text (or end of source)
j := bytes.Index(src[i : len(src)], close); // close marker
if j < 0 {
// missing closing
// TODO(gri) should this be an error?
j = n-i;
j = len(src)-i;
}
j += i;
// copy EBNF section
// copy EBNF text
buf.Write(src[i : j]);
// advance
src = src[j : len(src)];
}
return buf.Data();