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damus-c: remove UTF-8 punctuation from hashtags
Check for UTF-8 punctuation (such as ellipsis) in addition to regular punctuation in hashtags. Closes: https://github.com/damus-io/damus/issues/1518 Closes: https://github.com/damus-io/damus/pull/1546 Signed-off-by: William Casarin <jb55@jb55.com>
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510432bb98
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617dee3e6b
190
damus-c/cursor.h
190
damus-c/cursor.h
@ -107,6 +107,36 @@ static inline int pull_byte(struct cursor *cursor, u8 *c)
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return 1;
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}
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static inline int parse_byte(struct cursor *cursor, u8 *c)
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{
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if (unlikely(cursor->p >= cursor->end))
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return 0;
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*c = *cursor->p;
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//cursor->p++;
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return 1;
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}
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static inline int parse_char(struct cursor *cur, char c) {
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if (cur->p >= cur->end)
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return 0;
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if (*cur->p == c) {
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cur->p++;
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return 1;
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}
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return 0;
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}
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static inline int peek_char(struct cursor *cur, int ind) {
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if ((cur->p + ind < cur->start) || (cur->p + ind >= cur->end))
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return -1;
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return *(cur->p + ind);
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}
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static inline int cursor_pull_c_str(struct cursor *cursor, const char **str)
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{
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*str = (const char*)cursor->p;
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@ -435,12 +465,124 @@ static inline int is_whitespace(char c) {
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return c == ' ' || c == '\t' || c == '\n' || c == '\v' || c == '\f' || c == '\r';
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}
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static inline int is_underscore(char c) {
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return c == '_';
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}
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static inline int is_utf8_byte(u8 c) {
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return c & 0x80;
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}
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static inline int is_right_boundary(char c) {
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return is_whitespace(c) || ispunct(c);
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static inline int parse_utf8_char(struct cursor *cursor, unsigned int *code_point, unsigned int *utf8_length)
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{
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u8 first_byte;
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if (!parse_byte(cursor, &first_byte))
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return 0; // Not enough data
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// Determine the number of bytes in this UTF-8 character
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int remaining_bytes = 0;
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if (first_byte < 0x80) {
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*code_point = first_byte;
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return 1;
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} else if ((first_byte & 0xE0) == 0xC0) {
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remaining_bytes = 1;
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*utf8_length = remaining_bytes + 1;
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*code_point = first_byte & 0x1F;
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} else if ((first_byte & 0xF0) == 0xE0) {
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remaining_bytes = 2;
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*utf8_length = remaining_bytes + 1;
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*code_point = first_byte & 0x0F;
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} else if ((first_byte & 0xF8) == 0xF0) {
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remaining_bytes = 3;
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*utf8_length = remaining_bytes + 1;
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*code_point = first_byte & 0x07;
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} else {
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remaining_bytes = 0;
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*utf8_length = 1; // Assume 1 byte length for unrecognized UTF-8 characters
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// TODO: We need to gracefully handle unrecognized UTF-8 characters
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printf("Invalid UTF-8 byte: %x\n", *code_point);
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*code_point = ((first_byte & 0xF0) << 6); // Prevent testing as punctuation
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return 0; // Invalid first byte
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}
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// Peek at remaining bytes
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for (int i = 0; i < remaining_bytes; ++i) {
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signed char next_byte;
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if ((next_byte = peek_char(cursor, i+1)) == -1) {
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*utf8_length = 1;
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return 0; // Not enough data
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}
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// Debugging lines
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//printf("Cursor: %s\n", cursor->p);
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//printf("Codepoint: %x\n", *code_point);
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//printf("Codepoint <<6: %x\n", ((*code_point << 6) | (next_byte & 0x3F)));
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//printf("Remaining bytes: %x\n", remaining_bytes);
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//printf("First byte: %x\n", first_byte);
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//printf("Next byte: %x\n", next_byte);
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//printf("Bitwise AND result: %x\n", (next_byte & 0xC0));
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if ((next_byte & 0xC0) != 0x80) {
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*utf8_length = 1;
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return 0; // Invalid byte in sequence
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}
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*code_point = (*code_point << 6) | (next_byte & 0x3F);
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}
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return 1;
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}
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/**
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* Checks if a given Unicode code point is a punctuation character
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*
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* @param codepoint The Unicode code point to check. @return true if the
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* code point is a punctuation character, false otherwise.
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*/
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static inline int is_punctuation(unsigned int codepoint) {
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// Check for underscore (underscore is not treated as punctuation)
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if (is_underscore(codepoint))
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return 0;
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// Check for ASCII punctuation
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if (ispunct(codepoint))
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return 1;
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// Check for Unicode punctuation exceptions (punctuation allowed in hashtags)
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if (codepoint == 0x301C || codepoint == 0xFF5E) // Japanese Wave Dash / Tilde
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return 0;
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// Check for Unicode punctuation
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// NOTE: We may need to adjust the codepoint ranges in the future,
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// to include/exclude certain types of Unicode characters in hashtags.
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// Unicode Blocks Reference: https://www.compart.com/en/unicode/block
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return (
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// Latin-1 Supplement No-Break Space (NBSP): U+00A0
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(codepoint == 0x00A0) ||
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// Latin-1 Supplement Punctuation: U+00A1 to U+00BF
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(codepoint >= 0x00A1 && codepoint <= 0x00BF) ||
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// General Punctuation: U+2000 to U+206F
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(codepoint >= 0x2000 && codepoint <= 0x206F) ||
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// Currency Symbols: U+20A0 to U+20CF
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(codepoint >= 0x20A0 && codepoint <= 0x20CF) ||
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// Supplemental Punctuation: U+2E00 to U+2E7F
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(codepoint >= 0x2E00 && codepoint <= 0x2E7F) ||
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// CJK Symbols and Punctuation: U+3000 to U+303F
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(codepoint >= 0x3000 && codepoint <= 0x303F) ||
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// Ideographic Description Characters: U+2FF0 to U+2FFF
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(codepoint >= 0x2FF0 && codepoint <= 0x2FFF)
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);
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}
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static inline int is_right_boundary(int c) {
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return is_whitespace(c) || is_punctuation(c);
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}
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static inline int is_left_boundary(char c) {
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@ -452,15 +594,36 @@ static inline int is_alphanumeric(char c) {
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}
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static inline int consume_until_boundary(struct cursor *cur) {
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char c;
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unsigned int c;
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unsigned int char_length = 1;
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unsigned int *utf8_char_length = &char_length;
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while (cur->p < cur->end) {
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c = *cur->p;
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*utf8_char_length = 1;
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if (is_whitespace(c))
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return 1;
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// Need to check for UTF-8 characters, which can be multiple bytes long
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if (is_utf8_byte(c)) {
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if (!parse_utf8_char(cur, &c, utf8_char_length)) {
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if (!is_right_boundary(c)){
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// TODO: We should work towards handling all UTF-8 characters.
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printf("Invalid UTF-8 code point: %x\n", c);
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}
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}
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}
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if (is_right_boundary(c))
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return 1;
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cur->p++;
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// Need to use a variable character byte length for UTF-8 (2-4 bytes)
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if (cur->p + *utf8_char_length <= cur->end)
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cur->p += *utf8_char_length;
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else
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cur->p++;
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}
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return 1;
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@ -500,23 +663,4 @@ static inline int consume_until_non_alphanumeric(struct cursor *cur, int or_end)
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return or_end;
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}
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static inline int parse_char(struct cursor *cur, char c) {
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if (cur->p >= cur->end)
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return 0;
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if (*cur->p == c) {
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cur->p++;
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return 1;
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}
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return 0;
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}
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static inline int peek_char(struct cursor *cur, int ind) {
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if ((cur->p + ind < cur->start) || (cur->p + ind >= cur->end))
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return -1;
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return *(cur->p + ind);
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}
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#endif
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