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-rw-r--r--string32.c193
1 files changed, 0 insertions, 193 deletions
diff --git a/string32.c b/string32.c
deleted file mode 100644
index 1b4f1ac..0000000
--- a/string32.c
+++ /dev/null
@@ -1,193 +0,0 @@
-// UTF-32 string
-typedef struct {
- char32_t *str;
- size_t len;
-} String32;
-
-String32 str32(char32_t *str, size_t len) {
- String32 s = {str, len};
- return s;
-}
-
-String32 str32_substr(String32 s, size_t from, size_t len) {
- return str32(s.str + from, len);
-}
-
-// frees string and sets it to ""
-void str32_free(String32 *s) {
- free(s->str);
- s->str = NULL;
- s->len = 0;
-}
-
-// the string returned should be str32_free'd.
-// this will return an empty string if the allocation failed or the string is invalid UTF-8
-String32 str32_from_utf8(char const *utf8) {
- String32 string = {NULL, 0};
- size_t len = strlen(utf8);
- if (len) {
- // the wide string uses at most as many "characters" (elements?) as the UTF-8 string
- char32_t *widestr = calloc(len, sizeof *widestr);
- if (widestr) {
- char32_t *wide_p = widestr;
- char const *utf8_p = utf8;
- char const *utf8_end = utf8_p + len;
- while (utf8_p < utf8_end) {
- char32_t c = 0;
- size_t n = unicode_utf8_to_utf32(&c, utf8_p, (size_t)(utf8_end - utf8_p));
- if (n == 0 // null character. this shouldn't happen.
- || n >= (size_t)(-2) // invalid UTF-8
- ) {
- free(widestr);
- widestr = wide_p = NULL;
- break;
- } else {
- // n bytes consumed
- *wide_p++ = c;
- utf8_p += n;
- }
- }
- string.str = widestr;
- string.len = (size_t)(wide_p - widestr);
- }
- }
- return string;
-}
-
-// returns a null-terminated UTF-8 string
-// the string returned should be free'd
-// this will return NULL on failure
-static char *str32_to_utf8_cstr(String32 s) {
- char *utf8 = calloc(4 * s.len + 1, 1); // each codepoint takes up at most 4 bytes in UTF-8, + we need a terminating null byte
- if (utf8) {
- char *p = utf8;
- for (size_t i = 0; i < s.len; ++i) {
- size_t bytes = unicode_utf32_to_utf8(p, s.str[i]);
- if (bytes == (size_t)-1) {
- // invalid UTF-32 code point
- free(utf8);
- return NULL;
- } else {
- p += bytes;
- }
- }
- *p = '\0';
- }
- return utf8;
-}
-
-// compare s to the ASCII string `ascii`
-static int str32_cmp_ascii(String32 s, char const *ascii) {
- for (size_t i = 0; i < s.len; ++i) {
- assert((char32_t)ascii[i] < 128);
- if ((char32_t)ascii[i] == '\0')
- return -1; // ascii is a prefix of s
- if (s.str[i] > (char32_t)ascii[i])
- return +1;
- if (s.str[i] < (char32_t)ascii[i])
- return -1;
- }
- if (ascii[s.len]) {
- // s is a prefix of ascii
- return +1;
- }
- return 0;
-}
-
-// check if s starts with the ASCII string `ascii`
-static int str32_has_ascii_prefix(String32 s, char const *ascii) {
- for (size_t i = 0; i < s.len; ++i) {
- assert((char32_t)ascii[i] < 128);
- if ((char32_t)ascii[i] == '\0')
- return true; // ascii is a prefix of s
- if (s.str[i] > (char32_t)ascii[i])
- return false;
- if (s.str[i] < (char32_t)ascii[i])
- return false;
- }
- if (ascii[s.len]) {
- // s is a prefix of ascii
- return false;
- }
- // s is the same as ascii
- return true;
-}
-
-// returns the index of the given character in the string, or the length of the string if it's not found.
-size_t str32chr(String32 s, char32_t c) {
- for (size_t i = 0; i < s.len; ++i) {
- if (s.str[i] == c)
- return i;
- }
- return s.len;
-}
-
-// returns number of instances of c in s
-size_t str32_count_char(String32 s, char32_t c) {
- size_t total = 0;
- for (size_t i = 0; i < s.len; ++i) {
- total += s.str[i] == c;
- }
- return total;
-}
-
-// returns number of characters deleted from s
-size_t str32_remove_all_instances_of_char(String32 *s, char32_t c) {
- char32_t *str = s->str;
- size_t ndeleted = 0;
- size_t len = s->len;
- size_t out = 0;
- for (size_t in = 0; in < len; ++in) {
- if (str[in] == c) {
- ++ndeleted;
- } else {
- str[out++] = str[in];
- }
- }
- s->len = out;
- return ndeleted;
-}
-
-// returns the length of the longest prefix of `s` containing only
-// ASCII characters in the C-string `charset`.
-size_t str32_ascii_spn(String32 s, char const *charset) {
- for (u32 i = 0; i < s.len; ++i) {
- if (s.str[i] >= 128)
- return i; // non-ASCII character in s, so that can't be in charset.
- bool found = false;
- for (char const *p = charset; *p; ++p) {
- assert((char32_t)*p < 128);
- if ((char32_t)*p == s.str[i]) {
- found = true;
- break;
- }
- }
- if (!found) return i;
- }
- return s.len;
-}
-
-bool is32_space(char32_t c) {
- return c <= WINT_MAX && iswspace((wint_t)c);
-}
-
-bool is32_alpha(char32_t c) {
- return c <= WINT_MAX && iswalpha((wint_t)c);
-}
-
-bool is32_alnum(char32_t c) {
- return c <= WINT_MAX && iswalnum((wint_t)c);
-}
-
-bool is32_digit(char32_t c) {
- return c <= WINT_MAX && iswdigit((wint_t)c);
-}
-
-bool is32_graph(char32_t c) {
- return c <= WINT_MAX && iswgraph((wint_t)c);
-}
-
-// could this character appear in a C-style identifier?
-bool is32_ident(char32_t c) {
- return c <= WINT_MAX && (iswalnum((wint_t)c) || c == '_');
-}