| 79 | } |
| 80 | |
| 81 | static bool scan_string_content(TSLexer *lexer, Stack *stack) { |
| 82 | if (stack->size == 0) return false; // Stack is empty. We're not in a string. |
| 83 | Delimiter end_char = stack->contents[stack->size - 1]; // peek |
| 84 | bool is_triple = false; |
| 85 | bool has_content = false; |
| 86 | if (end_char & 1) { |
| 87 | is_triple = true; |
| 88 | end_char -= 1; |
| 89 | } |
| 90 | while (lexer->lookahead) { |
| 91 | if (lexer->lookahead == '$') { |
| 92 | // if we did not just start reading stuff, then we should stop |
| 93 | // lexing right here, so we can offer the opportunity to lex a |
| 94 | // interpolated identifier |
| 95 | if (has_content) { |
| 96 | lexer->result_symbol = STRING_CONTENT; |
| 97 | return has_content; |
| 98 | } |
| 99 | // otherwise, if this is the start, determine if it is an |
| 100 | // interpolated identifier. |
| 101 | // otherwise, it's just string content, so continue |
| 102 | advance(lexer); |
| 103 | if (iswalpha(lexer->lookahead) || lexer->lookahead == '{') { |
| 104 | // this must be a string interpolation, let's |
| 105 | // fail so we parse it as such |
| 106 | return false; |
| 107 | } |
| 108 | lexer->result_symbol = STRING_CONTENT; |
| 109 | lexer->mark_end(lexer); |
| 110 | return true; |
| 111 | } |
| 112 | if (lexer->lookahead == '\\') { |
| 113 | // if we see a \, then this might possibly escape a dollar sign |
| 114 | // in which case, we should not defer to the interpolation |
| 115 | advance(lexer); |
| 116 | // this dollar sign is escaped, so it must be content. |
| 117 | // we consume it here so we don't enter the dollar sign case above, |
| 118 | // which leaves the possibility that it is an interpolation |
| 119 | if (lexer->lookahead == '$') { |
| 120 | advance(lexer); |
| 121 | // however this leaves an edgecase where an escaped dollar sign could |
| 122 | // appear at the end of a string (e.g "aa\$") which isn't handled |
| 123 | // correctly; if we were at the end of the string, terminate properly |
| 124 | if (lexer->lookahead == end_char) { |
| 125 | stack_pop(stack); |
| 126 | advance(lexer); |
| 127 | lexer->mark_end(lexer); |
| 128 | lexer->result_symbol = STRING_END; |
| 129 | return true; |
| 130 | } |
| 131 | } |
| 132 | } else if (lexer->lookahead == end_char) { |
| 133 | if (is_triple) { |
| 134 | lexer->mark_end(lexer); |
| 135 | for (unsigned count = 1; count < DELIMITER_LENGTH; ++count) { |
| 136 | advance(lexer); |
| 137 | if (lexer->lookahead != end_char) { |
| 138 | lexer->mark_end(lexer); |
no test coverage detected