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// NOTE(bill): Used for UTF-8 strings
typedef struct String {
u8 *text;
isize len;
} String;
// NOTE(bill): used for printf style arguments
#define LIT(x) (x).len, (x).text
gb_inline String make_string(u8 *text, isize len) {
String s;
s.text = text;
if (len < 0)
len = gb_strlen(cast(char *)text);
s.len = len;
return s;
}
gb_inline String make_string(char *text) {
return make_string(cast(u8 *)cast(void *)text, gb_strlen(text));
}
gb_inline b32 are_strings_equal(String a, String b) {
if (a.len == b.len) {
for (isize i = 0; i < a.len; i++) {
if (a.text[i] != b.text[i]) {
return false;
}
}
return true;
}
return false;
}
gb_inline b32 are_strings_equal_ignore_case(String a, String b) {
if (a.len == b.len) {
for (isize i = 0; i < a.len; i++) {
char x = cast(char)a.text[i];
char y = cast(char)b.text[i];
if (gb_char_to_lower(x) != gb_char_to_lower(y))
return false;
}
return true;
}
return false;
}
gb_inline isize string_extension_position(String str) {
isize dot_pos = -1;
isize i = str.len;
b32 seen_dot = false;
while (i --> 0) {
if (str.text[i] == GB_PATH_SEPARATOR)
break;
if (str.text[i] == '.') {
dot_pos = i;
break;
}
}
return dot_pos;
}
gb_inline b32 string_has_extension(String str, String ext) {
if (str.len > ext.len+1) {
u8 *s = str.text+str.len - ext.len-1;
if (s[0] == '.') {
s++;
return gb_memcompare(s, ext.text, ext.len) == 0;
}
return false;
}
return false;
}
b32 string_contains_char(String s, u8 c) {
for (isize i = 0; i < s.len; i++) {
if (s.text[i] == c)
return true;
}
return false;
}
b32 unquote_char(String s, u8 quote, Rune *rune, b32 *multiple_bytes, String *tail_string) {
if (s.text[0] == quote &&
(quote == '\'' || quote == '"')) {
return false;
} else if (s.text[0] >= 0x80) {
Rune r = -1;
isize size = gb_utf8_decode(s.text, s.len, &r);
*rune = r;
*multiple_bytes = true;
*tail_string = make_string(s.text+size, s.len-size);
return true;
} else if (s.text[0] != '\\') {
*rune = s.text[0];
*tail_string = make_string(s.text+1, s.len-1);
return true;
}
if (s.len <= 1) {
return false;
}
u8 c = s.text[1];
s = make_string(s.text+2, s.len-2);
switch (c) {
default: return false;
case 'a': *rune = '\a'; break;
case 'b': *rune = '\b'; break;
case 'f': *rune = '\f'; break;
case 'n': *rune = '\n'; break;
case 'r': *rune = '\r'; break;
case 't': *rune = '\t'; break;
case 'v': *rune = '\v'; break;
case '\\': *rune = '\\'; break;
case '\'':
case '"':
if (c != quote) {
return false;
}
*rune = c;
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7': {
i32 r = gb_digit_to_int(c);
if (s.len < 2) {
return false;
}
for (isize i = 0; i < 2; i++) {
i32 d = gb_digit_to_int(s.text[i]);
if (d < 0 || d > 7) {
return false;
}
r = (r<<3) | d;
}
s = make_string(s.text+2, s.len-2);
if (r > 0xff) {
return false;
}
*rune = r;
} break;
case 'x':
case 'u':
case 'U': {
isize count = 0;
switch (c) {
case 'x': count = 2; break;
case 'u': count = 4; break;
case 'U': count = 8; break;
}
Rune r = 0;
if (s.len < count) {
return false;
}
for (isize i = 0; i < count; i++) {
i32 d = gb_hex_digit_to_int(s.text[i]);
if (d < 0) {
return false;
}
r = (r<<4) | d;
}
s = make_string(s.text+count, s.len-count);
if (c == 'x') {
*rune = r;
break;
}
if (r > GB_RUNE_MAX) {
return false;
}
*rune = r;
*multiple_bytes = true;
} break;
}
*tail_string = s;
return true;
}
// 0 == failure
// 1 == original memory
// 2 == new allocation
i32 unquote_string(gbAllocator a, String *s_) {
GB_ASSERT(s_ != NULL);
String s = *s_;
isize n = s.len;
if (n < 2)
return 0;
u8 quote = s.text[0];
if (quote != s.text[n-1])
return 0;
s.text += 1;
s.len -= 2;
if (quote == '`') {
if (string_contains_char(s, '`')) {
return 0;
}
*s_ = s;
return 1;
}
if (quote != '"' && quote != '\'')
return 0;
if (string_contains_char(s, '\n'))
return 0;
if (!string_contains_char(s, '\\') && !string_contains_char(s, quote)) {
if (quote == '"') {
*s_ = s;
return 1;
} else if (quote == '\'') {
Rune r = GB_RUNE_INVALID;
isize size = gb_utf8_decode(s.text, s.len, &r);
if ((size == s.len) && (r != -1 || size != 1)) {
*s_ = s;
return 1;
}
}
}
u8 rune_temp[4] = {};
isize buf_len = 3*s.len / 2;
u8 *buf = gb_alloc_array(a, u8, buf_len);
isize offset = 0;
while (s.len > 0) {
String tail_string = {};
Rune r = 0;
b32 multiple_bytes = false;
b32 success = unquote_char(s, quote, &r, &multiple_bytes, &tail_string);
if (!success) {
gb_free(a, buf);
return 0;
}
s = tail_string;
if (r < 0x80 || !multiple_bytes) {
buf[offset++] = cast(u8)r;
} else {
isize size = gb_utf8_encode_rune(rune_temp, r);
gb_memcopy(buf+offset, rune_temp, size);
offset += size;
}
if (quote == '\'' && s.len != 0) {
gb_free(a, buf);
return 0;
}
}
*s_ = make_string(buf, offset);
return 2;
}
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