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change handling of escapes for #4708

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This commit is contained in:
Nikolaj Bjorner 2021-01-29 13:36:47 -08:00
parent b11203e2d2
commit 4857446cf6
1 changed files with 5 additions and 103 deletions
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108
src/util/zstring.cpp
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@ -42,45 +42,12 @@ static bool is_octal_digit(char ch, unsigned& d) {
}
bool zstring::is_escape_char(char const *& s, unsigned& result) {
unsigned d1, d2, d3;
if (*s != '\\' || *(s + 1) == 0) {
return false;
}
if (*(s + 1) == 'x' &&
is_hex_digit(*(s + 2), d1) && is_hex_digit(*(s + 3), d2)) {
result = d1*16 + d2;
s += 4;
return true;
}
/* C-standard octal escapes: either 1, 2, or 3 octal digits,
* stopping either at 3 digits or at the first non-digit character.
*/
/* 1 octal digit */
if (is_octal_digit(*(s + 1), d1) && !is_octal_digit(*(s + 2), d2)) {
result = d1;
s += 2;
return true;
}
/* 2 octal digits */
if (is_octal_digit(*(s + 1), d1) && is_octal_digit(*(s + 2), d2) &&
!is_octal_digit(*(s + 3), d3)) {
result = d1 * 8 + d2;
s += 3;
return true;
}
/* 3 octal digits */
if (is_octal_digit(*(s + 1), d1) && is_octal_digit(*(s + 2), d2) &&
is_octal_digit(*(s + 3), d3)) {
result = d1*64 + d2*8 + d3;
s += 4;
return true;
}
if (*(s+1) == 'u' && *(s+2) == '{') {
unsigned d;
if (*s == '\\' && *(s+1) == 'u' && *(s+2) == '{') {
result = 0;
for (unsigned i = 0; i < 5; ++i) {
if (is_hex_digit(*(s+3+i), d1)) {
result = 16*result + d1;
if (is_hex_digit(*(s+3+i), d)) {
result = 16*result + d;
}
else if (*(s+3+i) == '}') {
if (result > 255 && !uses_unicode())
@ -92,63 +59,6 @@ bool zstring::is_escape_char(char const *& s, unsigned& result) {
break;
}
}
return false;
}
if (*(s+1) == 'u' && is_hex_digit(*(s+2), d1)) {
result = d1;
unsigned i = 0;
for (; i < 4; ++i) {
if (is_hex_digit(*(s+3+i), d1)) {
result = 16*result + d1;
}
else {
break;
}
}
if (result > 255 && !uses_unicode())
throw default_exception("unicode characters outside of byte range are not supported");
s += 3 + i;
return true;
}
switch (*(s + 1)) {
case 'a':
result = '\a';
s += 2;
return true;
case 'b':
result = '\b';
s += 2;
return true;
#if 0
case 'e':
result = '\e';
s += 2;
return true;
#endif
case 'f':
result = '\f';
s += 2;
return true;
case 'n':
result = '\n';
s += 2;
return true;
case 'r':
result = '\r';
s += 2;
return true;
case 't':
result = '\t';
s += 2;
return true;
case 'v':
result = '\v';
s += 2;
return true;
default:
result = *(s + 1);
s += 2;
return true;
}
return false;
}
@ -231,18 +141,10 @@ std::string zstring::encode() const {
#define _flush() if (offset > 0) { buffer[offset] = 0; strm << buffer; offset = 0; }
for (unsigned i = 0; i < m_buffer.size(); ++i) {
unsigned ch = m_buffer[i];
if (0 <= ch && ch < 32) {
_flush();
strm << esc_table[ch];
}
else if (ch >= 256) {
if (ch >= 128) {
_flush();
strm << "\\u{" << std::hex << ch << std::dec << "}";
}
else if (ch >= 128) {
_flush();
strm << "\\x" << std::hex << ch << std::dec;
}
else {
if (offset == 99)
_flush();