*/ int Decode_UTF8(REBUNI *dst, const REBYTE *src, REBCNT len, REBFLG ccr)
/*
** Decode UTF8 byte string into a 16 bit preallocated array.
**
** dst: the desination array, must always be large enough!
** src: source binary data
** len: byte-length of source (not number of chars)
** ccr: convert CRLF/CR to LF
**
** Returns length in chars (negative if all chars are latin-1).
** No terminator is added.
**
***********************************************************************/
{
int flag = -1;
UTF32 ch;
REBUNI *start = dst;
for (; len > 0; len--, src++) {
if ((ch = *src) >= 0x80) {
ch = Decode_UTF8_Char(&src, &len);
if (ch == 0) ch = UNI_REPLACEMENT_CHAR; // temporary!
if (ch > 0xff) flag = 1;
} if (ch == CR && ccr) {
if (src[1] == LF) continue;
ch = LF;
}
*dst++ = (REBUNI)ch;
}
return (dst - start) * flag;
}
*/ REBINT Compare_UTF8(REBYTE *s1, REBYTE *s2, REBCNT l2)
/*
** Compare two UTF8 strings.
**
** It is necessary to decode the strings to check if the match
** case-insensitively.
**
** Returns:
** -3: no match, s2 > s1
** -1: no match, s1 > s2
** 0: exact match
** 1: non-case match, s2 > s1
** 3: non-case match, s1 > s2
**
** So, result + 2 for no-match gives proper sort order.
** And, result - 2 for non-case match gives sort order.
**
** Used for: WORD comparison.
**
***********************************************************************/
{
REBINT c1, c2;
REBCNT l1 = LEN_BYTES(s1);
REBINT result = 0;
for (; l1 > 0 && l2 > 0; s1++, s2++, l1--, l2--) {
c1 = (REBYTE)*s1;
c2 = (REBYTE)*s2;
if (c1 > 127) c1 = Decode_UTF8_Char(&s1, &l1); //!!! can return 0 on error!
if (c2 > 127) c2 = Decode_UTF8_Char(&s2, &l2);
if (c1 != c2) {
if (c1 >= UNICODE_CASES || c2 >= UNICODE_CASES ||
LO_CASE(c1) != LO_CASE(c2)) {
return (c1 > c2) ? -1 : -3;
}
if (!result) result = (c1 > c2) ? 3 : 1;
}
}
if (l1 != l2) result = (l1 > l2) ? -1 : -3;
return result;
}
*/ REBYTE *Scan_Item(REBYTE *src, REBYTE *end, REBUNI term, REBYTE *invalid)
/*
** Scan as UTF8 an item like a file or URL.
**
** Returns continuation point or zero for error.
**
** Put result into the MOLD_BUF as uni-chars.
**
***********************************************************************/
{
REBUNI c;
REBSER *buf;
buf = BUF_MOLD;
RESET_TAIL(buf);
while (src < end && *src != term) {
c = *src;
// End of stream?
if (c == 0) break;
// If no term, then any white will terminate:
if (!term && IS_WHITE(c)) break;
// Ctrl chars are invalid:
if (c < ' ') return 0; // invalid char
if (c == '\\') c = '/';
// Accept %xx encoded char:
else if (c == '%') {
if (!Scan_Hex2(src+1, &c, FALSE)) return 0;
src += 2;
}
// Accept ^X encoded char:
else if (c == '^') {
if (src+1 == end) return 0; // nothing follows ^
c = Scan_Char(&src);
if (!term && IS_WHITE(c)) break;
src--;
}
// Accept UTF8 encoded char:
else if (c >= 0x80) {
c = Decode_UTF8_Char(&src, 0); // zero on error
if (c == 0) return 0;
}
// Is char as literal valid? (e.g. () [] etc.)
else if (invalid && strchr(invalid, c)) return 0;
src++;
*UNI_SKIP(buf, buf->tail) = c; // not affected by Extend_Series
if (++(buf->tail) >= SERIES_REST(buf)) Extend_Series(buf, 1);
}
if (*src && *src == term) src++;
UNI_TERM(buf);
return src;
}
*/ REBYTE *Scan_Quote(REBYTE *src, SCAN_STATE *scan_state)
/*
** Scan a quoted string, handling all the escape characters.
**
** The result will be put into the temporary MOLD_BUF unistring.
**
***********************************************************************/
{
REBINT nest = 0;
REBUNI term;
REBINT chr;
REBCNT lines = 0;
REBSER *buf = BUF_MOLD;
RESET_TAIL(buf);
term = (*src++ == '{') ? '}' : '"'; // pick termination
while (*src != term || nest > 0) {
chr = *src;
switch (chr) {
case 0:
return 0; // Scan_state shows error location.
case '^':
chr = Scan_Char(&src);
if (chr == -1) return 0;
src--;
break;
case '{':
if (term != '"') nest++;
break;
case '}':
if (term != '"' && nest > 0) nest--;
break;
case CR:
if (src[1] == LF) src++;
// fall thru
case LF:
if (term == '"') return 0;
lines++;
chr = LF;
break;
default:
if (chr >= 0x80) {
chr = Decode_UTF8_Char(&src, 0); // zero on error
if (chr == 0) return 0;
}
}
src++;
*UNI_SKIP(buf, buf->tail) = chr;
if (++(buf->tail) >= SERIES_REST(buf)) Extend_Series(buf, 1);
}
src++; // Skip ending quote or brace.
if (scan_state) scan_state->line_count += lines;
UNI_TERM(buf);
return src;
}
*/ static REBINT Scan_Char(REBYTE **bp)
/*
** Scan a char, handling ^A, ^/, ^(null), ^(1234)
**
** Returns the numeric value for char, or -1 for errors.
**
** Advances the cp to just past the last position.
**
** test: to-integer load to-binary mold to-char 1234
**
***********************************************************************/
{
REBINT n;
REBYTE *cp;
REBYTE c;
REBYTE lex;
c = **bp;
// Handle unicoded char:
if (c >= 0x80) {
n = Decode_UTF8_Char(bp, 0); // zero on error
(*bp)++; // skip char
return n;
}
(*bp)++;
if (c != '^') return c;
// Must be ^ escaped char:
c = **bp;
(*bp)++;
switch (c) {
case 0:
n = 0;
break;
case '/':
n = LF;
break;
case '^':
n = c;
break;
case '-':
n = TAB;
break;
case '!':
n = '\036'; // record separator
break;
case '(': // ^(tab) ^(1234)
// Check for hex integers ^(1234):
cp = *bp; // restart location
n = 0;
while ((lex = Lex_Map[*cp]) > LEX_WORD) {
c = lex & LEX_VALUE;
if (!c && lex < LEX_NUMBER) break;
n = (n << 4) + c;
cp++;
}
if ((cp - *bp) > 4) return -1;
if (*cp == ')') {
cp++;
*bp = cp;
return n;
}
// Check for identifiers:
for (n = 0; n < ESC_MAX; n++) {
if (NZ(cp = Match_Bytes(*bp, (REBYTE*)(Esc_Names[n])))) {
if (cp && *cp == ')') {
*bp = cp + 1;
return Esc_Codes[n];
}
}
}
return -1;
default:
n = UP_CASE(c);
if (n >= '@' && n <= '_') n -= '@';
else if (n == '~') n = 0x7f; // special for DEL
else n = c; // includes: ^{ ^} ^"
}
return n;
}
