mirror of https://github.com/Wilfred/difftastic/
143 lines
4.2 KiB
C
143 lines
4.2 KiB
C
#pragma once
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#include <ctype.h>
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#include <tree_sitter/parser.h>
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enum TokenType {
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PI_TARGET,
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PI_CONTENT,
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COMMENT,
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CHAR_DATA,
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CDATA,
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XML_MODEL,
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XML_STYLESHEET,
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};
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/// Advance the lexer if the next token doesn't match the given character
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#define advance_if_not(lexer, chr) \
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if ((lexer)->lookahead != (chr)) return false; advance((lexer))
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/// Advance the lexer to the next token
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static inline void advance(TSLexer *lexer) { lexer->advance(lexer, false); }
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/// Check if the character is valid in PITarget
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/// @private
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static inline bool is_valid_pi_char(int32_t chr) {
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return isalnum(chr) || chr == '_' || chr == ':' || chr == '.' || chr == '-' || chr == L'·';
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}
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/// Check if the lexer matches the given word
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/// @private
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static inline bool check_word(TSLexer *lexer, const char *const word) {
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for (int j = 0; word[j] != '\0'; ++j) {
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advance_if_not(lexer, word[j]);
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}
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return true;
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}
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/// Scan for the target of a PI node
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static bool scan_pi_target(TSLexer *lexer, const bool *valid_symbols) {
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bool advanced_once = false, found_x_first = false;
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if (isalpha(lexer->lookahead) || lexer->lookahead == '_') {
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if (lexer->lookahead == 'x' || lexer->lookahead == 'X') {
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found_x_first = true;
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lexer->mark_end(lexer);
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}
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advanced_once = true;
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advance(lexer);
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}
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if (advanced_once) {
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while (is_valid_pi_char(lexer->lookahead)) {
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if (found_x_first &&
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(lexer->lookahead == 'm' || lexer->lookahead == 'M')) {
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advance(lexer);
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if (lexer->lookahead == 'l' || lexer->lookahead == 'L') {
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advance(lexer);
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if (is_valid_pi_char(lexer->lookahead)) {
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found_x_first = false;
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bool last_char_hyphen = lexer->lookahead == '-';
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advance(lexer);
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if (last_char_hyphen) {
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if (valid_symbols[XML_MODEL] && check_word(lexer, "model")) return false;
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if (valid_symbols[XML_STYLESHEET] && check_word(lexer, "stylesheet")) return false;
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}
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} else {
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return false;
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}
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}
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}
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found_x_first = false;
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advance(lexer);
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}
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lexer->mark_end(lexer);
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lexer->result_symbol = PI_TARGET;
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return true;
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}
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return false;
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}
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/// Scan for the content of a PI node
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static bool scan_pi_content(TSLexer *lexer) {
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while (!lexer->eof(lexer) && lexer->lookahead != '\n' && lexer->lookahead != '?') advance(lexer);
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if (lexer->lookahead != '?') return false;
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lexer->mark_end(lexer);
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advance(lexer);
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if (lexer->lookahead == '>') {
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advance(lexer);
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while (lexer->lookahead == ' ') advance(lexer);
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advance_if_not(lexer, '\n');
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lexer->result_symbol = PI_CONTENT;
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return true;
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}
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return false;
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}
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/// Scan for a Comment node
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static bool scan_comment(TSLexer *lexer) {
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advance_if_not(lexer, '<');
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advance_if_not(lexer, '!');
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advance_if_not(lexer, '-');
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advance_if_not(lexer, '-');
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while (!lexer->eof(lexer)) {
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if (lexer->lookahead == '-') {
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advance(lexer);
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if (lexer->lookahead == '-') {
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advance(lexer);
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break;
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}
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} else {
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advance(lexer);
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}
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}
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if (lexer->lookahead == '>') {
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advance(lexer);
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lexer->mark_end(lexer);
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lexer->result_symbol = COMMENT;
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return true;
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}
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return false;
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}
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/// Define the boilerplate functions of the scanner
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#define SCANNER_BOILERPLATE(name) \
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void *tree_sitter_##name##_external_scanner_create() { return NULL; } \
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\
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void tree_sitter_##name##_external_scanner_destroy(void *payload) {} \
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\
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void tree_sitter_##name##_external_scanner_reset(void *payload) {} \
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\
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unsigned tree_sitter_##name##_external_scanner_serialize(void *payload, char *buffer) { return 0; } \
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\
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void tree_sitter_##name##_external_scanner_deserialize(void *payload, const char *buffer, unsigned length) {}
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