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Support \u{XXXXXX} character escape sequences.

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This commit is contained in:
Tor Andersson
2024-01-20 12:43:32 +01:00
parent a76d157bda
commit 4892c6e157
1 changed files with 32 additions and 13 deletions
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jslex.c
+32 -13
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@@ -180,13 +180,24 @@ static void jsY_unescape(js_State *J)
{
if (jsY_accept(J, '\\')) {
if (jsY_accept(J, 'u')) {
int x = 0;
if (!jsY_ishex(J->lexchar)) { goto error; } x |= jsY_tohex(J->lexchar) << 12; jsY_next(J);
if (!jsY_ishex(J->lexchar)) { goto error; } x |= jsY_tohex(J->lexchar) << 8; jsY_next(J);
if (!jsY_ishex(J->lexchar)) { goto error; } x |= jsY_tohex(J->lexchar) << 4; jsY_next(J);
if (!jsY_ishex(J->lexchar)) { goto error; } x |= jsY_tohex(J->lexchar);
J->lexchar = x;
return;
if (jsY_accept(J, '{')) {
int x = 0;
while (jsY_ishex(J->lexchar)) {
x = (x << 4) | jsY_tohex(J->lexchar);
jsY_next(J);
}
jsY_expect(J, '}');
J->lexchar = x;
return;
} else {
int x = 0;
if (!jsY_ishex(J->lexchar)) { goto error; } x |= jsY_tohex(J->lexchar) << 12; jsY_next(J);
if (!jsY_ishex(J->lexchar)) { goto error; } x |= jsY_tohex(J->lexchar) << 8; jsY_next(J);
if (!jsY_ishex(J->lexchar)) { goto error; } x |= jsY_tohex(J->lexchar) << 4; jsY_next(J);
if (!jsY_ishex(J->lexchar)) { goto error; } x |= jsY_tohex(J->lexchar);
J->lexchar = x;
return;
}
}
error:
jsY_error(J, "unexpected escape sequence");
@@ -398,10 +409,18 @@ static int lexescape(js_State *J)
case EOF: jsY_error(J, "unterminated escape sequence");
case 'u':
jsY_next(J);
if (!jsY_ishex(J->lexchar)) return 1; else { x |= jsY_tohex(J->lexchar) << 12; jsY_next(J); }
if (!jsY_ishex(J->lexchar)) return 1; else { x |= jsY_tohex(J->lexchar) << 8; jsY_next(J); }
if (!jsY_ishex(J->lexchar)) return 1; else { x |= jsY_tohex(J->lexchar) << 4; jsY_next(J); }
if (!jsY_ishex(J->lexchar)) return 1; else { x |= jsY_tohex(J->lexchar); jsY_next(J); }
if (jsY_accept(J, '{')) {
while (jsY_ishex(J->lexchar)) {
x = (x << 4) | jsY_tohex(J->lexchar);
jsY_next(J);
}
jsY_expect(J, '}');
} else {
if (!jsY_ishex(J->lexchar)) return 1; else { x |= jsY_tohex(J->lexchar) << 12; jsY_next(J); }
if (!jsY_ishex(J->lexchar)) return 1; else { x |= jsY_tohex(J->lexchar) << 8; jsY_next(J); }
if (!jsY_ishex(J->lexchar)) return 1; else { x |= jsY_tohex(J->lexchar) << 4; jsY_next(J); }
if (!jsY_ishex(J->lexchar)) return 1; else { x |= jsY_tohex(J->lexchar); jsY_next(J); }
}
textpush(J, x);
break;
case 'x':
@@ -723,7 +742,7 @@ static int jsY_lexx(js_State *J)
if (J->lexchar >= 0x20 && J->lexchar <= 0x7E)
jsY_error(J, "unexpected character: '%c'", J->lexchar);
jsY_error(J, "unexpected character: \\u%04X", J->lexchar);
jsY_error(J, "unexpected character: \\u{%04X}", J->lexchar);
}
}
@@ -873,6 +892,6 @@ int jsY_lexjson(js_State *J)
if (J->lexchar >= 0x20 && J->lexchar <= 0x7E)
jsY_error(J, "unexpected character: '%c'", J->lexchar);
jsY_error(J, "unexpected character: \\u%04X", J->lexchar);
jsY_error(J, "unexpected character: \\u{%04X}", J->lexchar);
}
}