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Extract read_escape_unicode from read_escape

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This commit is contained in:
Nobuyoshi Nakada
2016-12-01 11:30:07 +09:00
parent bd9bc7786f
commit fed40b44b8
1 changed files with 45 additions and 43 deletions
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mrbgems/mruby-compiler/core/parse.y
+45 -43
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@@ -3752,6 +3752,44 @@ scan_hex(const int *start, int len, int *retlen)
return retval;
}
static int32_t
read_escape_unicode(parser_state *p, size_t limit)
{
int32_t c;
int buf[9];
int i;
/* Look for opening brace */
i = 0;
buf[0] = nextc(p);
if (buf[0] < 0) goto eof;
if (ISXDIGIT(buf[0])) {
/* \uxxxx form */
for (i=1; i<limit; i++) {
buf[i] = nextc(p);
if (buf[i] < 0) goto eof;
if (!ISXDIGIT(buf[i])) {
pushback(p, buf[i]);
break;
}
}
}
else {
pushback(p, buf[0]);
}
c = scan_hex(buf, i, &i);
if (i == 0) {
eof:
yyerror(p, "Invalid escape character syntax");
return -1;
}
if (c < 0 || c > 0x10FFFF || (c & 0xFFFFF800) == 0xD800) {
yyerror(p, "Invalid Unicode code point");
return -1;
}
return c;
}
/* Return negative to indicate Unicode code point */
static int32_t
read_escape(parser_state *p)
@@ -3824,53 +3862,17 @@ read_escape(parser_state *p)
return c;
case 'u': /* Unicode */
{
int buf[9];
int i;
/* Look for opening brace */
i = 0;
buf[0] = nextc(p);
if (buf[0] < 0) goto eof;
if (buf[0] == '{') {
if (peek(p, '{')) {
/* \u{xxxxxxxx} form */
for (i=0; i<9; i++) {
buf[i] = nextc(p);
if (buf[i] < 0) goto eof;
if (buf[i] == '}') {
break;
}
else if (!ISXDIGIT(buf[i])) {
yyerror(p, "Invalid escape character syntax");
pushback(p, buf[i]);
return 0;
}
}
}
else if (ISXDIGIT(buf[0])) {
/* \uxxxx form */
for (i=1; i<4; i++) {
buf[i] = nextc(p);
if (buf[i] < 0) goto eof;
if (!ISXDIGIT(buf[i])) {
pushback(p, buf[i]);
break;
}
}
nextc(p);
c = read_escape_unicode(p, 8);
if (c < 0) return 0;
if (nextc(p) != '}') goto eof;
}
else {
pushback(p, buf[0]);
c = read_escape_unicode(p, 4);
if (c < 0) return 0;
}
c = scan_hex(buf, i, &i);
if (i == 0) {
yyerror(p, "Invalid escape character syntax");
return 0;
}
if (c < 0 || c > 0x10FFFF || (c & 0xFFFFF800) == 0xD800) {
yyerror(p, "Invalid Unicode code point");
return 0;
}
}
return -c;
case 'b':/* backspace */