Function addErrorHighlighting

tools/shell/linenoise.cpp:1665–1857

}

void addErrorHighlighting(uint64_t render_start, uint64_t render_end,
    std::vector<highlightToken>& tokens, struct linenoiseState* l) {
    enum class ScanState {
        STANDARD,
        IN_SINGLE_QUOTE,
        IN_DOUBLE_QUOTE,
        IN_COMMENT,
        IN_MULTILINE_COMMENT
    };

    static constexpr const uint64_t MAX_ERROR_LENGTH = 2000;
    if (l->len >= MAX_ERROR_LENGTH) {
        return;
    }
    // do a pass over the buffer to collect errors:
    // * brackets without matching closing/opening bracket
    // * single quotes without matching closing single quote
    // * double quote without matching double quote
    ScanState state = ScanState::STANDARD;
    std::vector<uint64_t> brackets;        // ()
    std::vector<uint64_t> square_brackets; // []
    std::vector<uint64_t> curly_brackets;  // {}
    std::vector<uint64_t> errors;
    std::vector<uint64_t> cursor_brackets;
    std::vector<uint64_t> comment_start;
    std::vector<uint64_t> comment_end;
    std::string dollar_quote_marker;
    uint64_t quote_pos = 0;
    for (uint64_t i = 0; i < l->len; i++) {
        auto c = l->buf[i];
        switch (state) {
        case ScanState::STANDARD:
            switch (c) {
            case '/':
                if (i + 1 < l->len && l->buf[i + 1] == '/') {
                    // // puts us in a comment
                    comment_start.push_back(i);
                    i++;
                    state = ScanState::IN_COMMENT;
                } else if (i + 1 < l->len && l->buf[i + 1] == '*') {
                    // /* puts us in a multiline comment
                    comment_start.push_back(i);
                    i++;
                    state = ScanState::IN_MULTILINE_COMMENT;
                }
                break;
            case '\'':
                state = ScanState::IN_SINGLE_QUOTE;
                quote_pos = i;
                break;
            case '\"':
                state = ScanState::IN_DOUBLE_QUOTE;
                quote_pos = i;
                break;
            case '(':
                openBracket(brackets, cursor_brackets, l->pos, i);
                break;
            case '[':