// JQHTML Lexer - Simple character scanner, no regex
// Tracks positions for source map support
import { JQHTMLParseError } from './errors.js';
export var TokenType;
(function (TokenType) {
    // Literals
    TokenType["TEXT"] = "TEXT";
    // JQHTML tags
    TokenType["EXPRESSION_START"] = "EXPRESSION_START";
    TokenType["EXPRESSION_UNESCAPED"] = "EXPRESSION_UNESCAPED";
    TokenType["CODE_START"] = "CODE_START";
    TokenType["TAG_END"] = "TAG_END";
    // Control flow
    TokenType["IF"] = "IF";
    TokenType["ELSE"] = "ELSE";
    TokenType["ELSEIF"] = "ELSEIF";
    TokenType["ENDIF"] = "ENDIF";
    TokenType["FOR"] = "FOR";
    TokenType["ENDFOR"] = "ENDFOR";
    // Comments
    TokenType["COMMENT"] = "COMMENT";
    // Component definition
    TokenType["DEFINE_START"] = "DEFINE_START";
    TokenType["DEFINE_END"] = "DEFINE_END";
    TokenType["COMPONENT_NAME"] = "COMPONENT_NAME";
    // Slots (v2)
    TokenType["SLOT_START"] = "SLOT_START";
    TokenType["SLOT_END"] = "SLOT_END";
    TokenType["SLOT_NAME"] = "SLOT_NAME";
    // HTML tags
    TokenType["TAG_OPEN"] = "TAG_OPEN";
    TokenType["TAG_CLOSE"] = "TAG_CLOSE";
    TokenType["TAG_NAME"] = "TAG_NAME";
    TokenType["SELF_CLOSING"] = "SELF_CLOSING";
    // Attributes
    TokenType["ATTR_NAME"] = "ATTR_NAME";
    TokenType["ATTR_VALUE"] = "ATTR_VALUE";
    // Delimiters
    TokenType["COLON"] = "COLON";
    TokenType["SEMICOLON"] = "SEMICOLON";
    TokenType["GT"] = "GT";
    TokenType["LT"] = "LT";
    TokenType["SLASH"] = "SLASH";
    TokenType["EQUALS"] = "EQUALS";
    TokenType["QUOTE"] = "QUOTE";
    // Special
    TokenType["EOF"] = "EOF";
    TokenType["NEWLINE"] = "NEWLINE";
    TokenType["WHITESPACE"] = "WHITESPACE";
    // JavaScript code
    TokenType["JAVASCRIPT"] = "JAVASCRIPT";
})(TokenType || (TokenType = {}));
export class Lexer {
    input;
    position = 0;
    line = 1;
    column = 1;
    tokens = [];
    // Track saved positions for accurate token creation
    savedPosition = null;
    constructor(input) {
        // Preprocess: Replace JQHTML comments (<%-- --%) with equivalent newlines to preserve line mapping
        let processed = this.preprocessComments(input);
        // Preprocess: Replace HTML comments (<!-- -->) outside Define tags with equivalent newlines
        processed = this.preprocessHTMLComments(processed);
        // Preprocess: Insert // for empty lines in code blocks to preserve line mapping
        processed = this.preprocessCodeBlocks(processed);
        this.input = processed;
    }
    /**
     * Save current position for later token creation
     */
    savePosition() {
        this.savedPosition = {
            line: this.line,
            column: this.column,
            offset: this.position
        };
        return this.savedPosition;
    }
    /**
     * Get saved position or current position
     */
    getSavedPosition() {
        if (this.savedPosition) {
            const pos = this.savedPosition;
            this.savedPosition = null;
            return pos;
        }
        return {
            line: this.line,
            column: this.column,
            offset: this.position
        };
    }
    /**
     * Replace <%-- comment --%> with equivalent number of newlines
     * This ensures line mapping stays accurate while removing comment content
     */
    preprocessComments(input) {
        let result = input;
        let searchPos = 0;
        while (true) {
            // Find next comment start
            const startIdx = result.indexOf('<%--', searchPos);
            if (startIdx === -1)
                break;
            // Find matching comment end
            const endIdx = result.indexOf('--%>', startIdx + 4);
            if (endIdx === -1) {
                // Unclosed comment - leave it for parser to report error
                break;
            }
            // Extract the comment including delimiters
            const commentText = result.substring(startIdx, endIdx + 4);
            // Count newlines in the comment
            const newlineCount = (commentText.match(/\n/g) || []).length;
            // Replace comment with spaces and same number of newlines
            // We preserve the same total length to keep position tracking accurate
            let replacement = '';
            let charsNeeded = commentText.length;
            // First, add the newlines at their original positions
            let commentPos = 0;
            for (let i = 0; i < commentText.length; i++) {
                if (commentText[i] === '\n') {
                    replacement += '\n';
                }
                else {
                    replacement += ' ';
                }
            }
            // Replace the comment with the spacing
            result = result.substring(0, startIdx) + replacement + result.substring(endIdx + 4);
            // Move search position past this replacement
            searchPos = startIdx + replacement.length;
        }
        return result;
    }
    /**
     * Replace HTML comments (<!-- -->) that appear OUTSIDE of <Define> tags
     * This strips documentation comments before component definitions
     * HTML comments INSIDE <Define> tags are preserved in the output
     */
    preprocessHTMLComments(input) {
        let result = input;
        let searchPos = 0;
        let insideDefine = false;
        while (searchPos < result.length) {
            // Check if we're entering or leaving a Define tag
            if (result.substring(searchPos, searchPos + 8) === '<Define:') {
                insideDefine = true;
                searchPos += 8;
                continue;
            }
            if (result.substring(searchPos, searchPos + 9) === '</Define:') {
                insideDefine = false;
                searchPos += 9;
                continue;
            }
            // Only strip HTML comments if we're outside Define tags
            if (!insideDefine && result.substring(searchPos, searchPos + 4) === '<!--') {
                const startIdx = searchPos;
                // Find matching comment end
                const endIdx = result.indexOf('-->', searchPos + 4);
                if (endIdx === -1) {
                    // Unclosed comment - leave it for lexer to report error
                    break;
                }
                // Extract the comment including delimiters
                const commentText = result.substring(startIdx, endIdx + 3);
                // Replace comment with spaces and same number of newlines to preserve line mapping
                let replacement = '';
                for (let i = 0; i < commentText.length; i++) {
                    if (commentText[i] === '\n') {
                        replacement += '\n';
                    }
                    else {
                        replacement += ' ';
                    }
                }
                // Replace the comment with the spacing
                result = result.substring(0, startIdx) + replacement + result.substring(endIdx + 3);
                // Move search position past this replacement
                searchPos = startIdx + replacement.length;
            }
            else {
                searchPos++;
            }
        }
        return result;
    }
    /**
     * Preprocess code blocks and expressions
     * - Insert comment markers for empty lines in code blocks
     * - Collapse multi-line expressions to single line with trailing newlines
     * This ensures 1:1 line mapping in generated code
     */
    preprocessCodeBlocks(input) {
        let result = input;
        let searchPos = 0;
        while (true) {
            // Find next <% sequence
            let startIdx = result.indexOf('<%', searchPos);
            if (startIdx === -1)
                break;
            // Check what type of block this is
            const isExpression = result[startIdx + 2] === '=';
            const isUnescapedExpression = result.substring(startIdx + 2, startIdx + 4) === '!=';
            if (isExpression || isUnescapedExpression) {
                // Handle expressions: collapse to single line
                const exprStart = isUnescapedExpression ? startIdx + 4 : startIdx + 3;
                // Find matching %> considering strings
                const endIdx = this.findClosingTag(result, exprStart);
                if (endIdx === -1) {
                    // Unclosed expression - leave it for parser to report error
                    searchPos = startIdx + 2;
                    continue;
                }
                // Extract the expression content
                const exprContent = result.substring(exprStart, endIdx);
                // Count newlines in the expression
                const newlineCount = (exprContent.match(/\n/g) || []).length;
                if (newlineCount > 0) {
                    // Collapse multi-line expression to single line
                    // Replace all newlines with spaces to preserve token separation
                    const collapsedExpr = exprContent.replace(/\n/g, ' ');
                    // Add trailing newlines after the expression
                    const trailingNewlines = '\n'.repeat(newlineCount);
                    // Reconstruct with collapsed expression and trailing newlines
                    const prefix = result.substring(0, exprStart);
                    const suffix = result.substring(endIdx);
                    result = prefix + collapsedExpr + suffix.substring(0, 2) + trailingNewlines + suffix.substring(2);
                }
                searchPos = startIdx + 2;
            }
            else {
                // Handle code blocks: insert /* empty line */ for empty lines
                const endIdx = this.findClosingTag(result, startIdx + 2);
                if (endIdx === -1) {
                    // Unclosed code block - leave it for parser to report error
                    break;
                }
                // Extract the code block content between <% and %>
                const blockContent = result.substring(startIdx + 2, endIdx);
                // Process the content line by line
                const lines = blockContent.split('\n');
                const processedLines = [];
                for (let i = 0; i < lines.length; i++) {
                    const line = lines[i];
                    const trimmed = line.trim();
                    // Don't add placeholders on the last line if it's empty
                    // (this would be right before the %>)
                    if (trimmed === '' && i < lines.length - 1) {
                        // Empty line - use /* */ instead of // to avoid breaking code
                        // Extra trailing space helps with alignment
                        processedLines.push(' /* empty line */ ');
                    }
                    else {
                        // Line has code or is the last line - keep as is
                        processedLines.push(line);
                    }
                }
                // Reconstruct the code block
                const processedContent = processedLines.join('\n');
                result = result.substring(0, startIdx + 2) + processedContent + result.substring(endIdx);
                // Move search position past this block
                searchPos = startIdx + 2 + processedContent.length + 2; // +2 for %>
            }
        }
        return result;
    }
    /**
     * Find the closing %> tag, properly handling strings and comments
     */
    findClosingTag(input, startPos) {
        let pos = startPos;
        let inString = false;
        let stringDelimiter = '';
        let inComment = false;
        let commentType = '';
        while (pos < input.length - 1) {
            const char = input[pos];
            const nextChar = input[pos + 1];
            // Handle string literals
            if (!inComment) {
                if (!inString && (char === '"' || char === "'" || char === '`')) {
                    inString = true;
                    stringDelimiter = char;
                }
                else if (inString && char === stringDelimiter) {
                    // Check if it's escaped
                    let escapeCount = 0;
                    let checkPos = pos - 1;
                    while (checkPos >= 0 && input[checkPos] === '\\') {
                        escapeCount++;
                        checkPos--;
                    }
                    if (escapeCount % 2 === 0) {
                        inString = false;
                        stringDelimiter = '';
                    }
                }
            }
            // Handle comments
            if (!inString && !inComment) {
                if (char === '/' && nextChar === '/') {
                    inComment = true;
                    commentType = 'line';
                }
                else if (char === '/' && nextChar === '*') {
                    inComment = true;
                    commentType = 'block';
                }
            }
            else if (inComment) {
                if (commentType === 'line' && char === '\n') {
                    inComment = false;
                    commentType = '';
                }
                else if (commentType === 'block' && char === '*' && nextChar === '/') {
                    inComment = false;
                    commentType = '';
                    pos++; // Skip the /
                }
            }
            // Check for closing tag only if not in string or comment
            if (!inString && !inComment) {
                if (char === '%' && nextChar === '>') {
                    return pos;
                }
            }
            pos++;
        }
        return -1; // Not found
    }
    tokenize() {
        while (this.position < this.input.length) {
            this.scan_next();
        }
        this.add_token(TokenType.EOF, '', this.position, this.position);
        return this.tokens;
    }
    scan_next() {
        const start = this.position;
        const start_line = this.line;
        const start_column = this.column;
        // Check for JQHTML tags first
        // Comments are now preprocessed out, so we don't need to check for them
        if (this.match_sequence('<%!=')) {
            this.add_token(TokenType.EXPRESSION_UNESCAPED, '<%!=', start, this.position);
            this.scan_expression();
            return;
        }
        if (this.match_sequence('<%=')) {
            this.add_token(TokenType.EXPRESSION_START, '<%=', start, this.position);
            this.scan_expression();
            return;
        }
        if (this.match_sequence('<%')) {
            this.add_token(TokenType.CODE_START, '<%', start, this.position);
            this.scan_code_block();
            return;
        }
        if (this.match_sequence('%>')) {
            this.add_token(TokenType.TAG_END, '%>', start, this.position);
            return;
        }
        // Check for Define tags
        if (this.match_sequence('<Define:')) {
            this.add_token(TokenType.DEFINE_START, '<Define:', start, this.position);
            this.scan_component_name();
            return;
        }
        if (this.match_sequence('</Define:')) {
            this.add_token(TokenType.DEFINE_END, '</Define:', start, this.position);
            this.scan_component_name();
            return;
        }
        // Check for slot tags (v2)
        if (this.match_sequence('</#')) {
            this.add_token(TokenType.SLOT_END, '</#', start, this.position);
            this.scan_slot_name();
            return;
        }
        if (this.match_sequence('<#')) {
            this.add_token(TokenType.SLOT_START, '<#', start, this.position);
            this.scan_slot_name();
            return;
        }
        // Check for HTML comment first
        if (this.current_char() === '<' && this.peek_ahead(1) === '!' &&
            this.peek_ahead(2) === '-' && this.peek_ahead(3) === '-') {
            this.scan_html_comment();
            return;
        }
        // Check for HTML tags (including components)
        if (this.current_char() === '<') {
            // Peek ahead to see if this is an HTML tag
            if (this.peek_ahead(1) === '/') {
                // Closing tag
                if (this.is_tag_name_char(this.peek_ahead(2))) {
                    this.scan_closing_tag();
                    return;
                }
            }
            else if (this.is_tag_name_char(this.peek_ahead(1))) {
                // Opening tag
                this.scan_opening_tag();
                return;
            }
        }
        // Single character tokens
        const char = this.current_char();
        // Don't tokenize < and > separately when they're part of HTML
        // They should be part of TEXT tokens
        /*
        if (char === '<') {
          this.advance();
          this.add_token(TokenType.LT, '<', start, this.position);
          return;
        }
        
        if (char === '>') {
          this.advance();
          this.add_token(TokenType.GT, '>', start, this.position);
          return;
        }
        */
        if (char === '\n') {
            this.advance();
            this.add_token(TokenType.NEWLINE, '\n', start, this.position);
            return;
        }
        // Default: scan as text until next special character
        this.scan_text();
    }
    scan_text() {
        const start = this.position;
        const start_line = this.line;
        const start_column = this.column;
        let text = '';
        while (this.position < this.input.length) {
            const char = this.current_char();
            // Stop at any potential tag start
            if (char === '<') {
                // Check for HTML comment first - don't break, these should be in text
                if (this.peek_ahead(1) === '!' &&
                    this.peek_ahead(2) === '-' &&
                    this.peek_ahead(3) === '-') {
                    break; // HTML comment will be handled separately
                }
                // Peek ahead for special sequences
                if (this.peek_ahead(1) === '%' ||
                    this.peek_ahead(1) === '#' || // Slot start
                    this.peek_ahead(1) === '/' && this.peek_ahead(2) === '#' || // Slot end
                    this.peek_ahead(1) === 'D' && this.peek_sequence_at(1, 'Define:') ||
                    this.peek_ahead(1) === '/' && this.peek_sequence_at(1, '/Define:')) {
                    break;
                }
                // Also stop for HTML tags
                if (this.peek_ahead(1) === '/' && this.is_tag_name_char(this.peek_ahead(2))) {
                    break; // Closing tag
                }
                if (this.is_tag_name_char(this.peek_ahead(1))) {
                    break; // Opening tag
                }
            }
            if (char === '%' && this.peek_ahead(1) === '>') {
                break;
            }
            text += char;
            this.advance();
        }
        if (text.length > 0) {
            this.add_token(TokenType.TEXT, text, start, this.position, start_line, start_column);
        }
    }
    scan_code_block() {
        // After <%, save the original position INCLUDING whitespace
        const position_with_whitespace = this.position;
        // Now skip whitespace to check for keywords
        this.skip_whitespace();
        const saved_position = this.position;
        // Check for control flow keywords only if they have colon syntax
        if (this.match_keyword('if') && this.peek_for_colon()) {
            // Rewind to capture keyword
            this.position = saved_position;
            const keyword_start = this.position;
            this.match_keyword('if'); // consume again
            this.add_token(TokenType.IF, 'if', keyword_start, this.position);
            this.scan_javascript(); // Scan the condition
        }
        else if (this.match_keyword('else') &&
            (this.peek_for_colon() || this.peek_sequence(':') || this.peek_sequence('%>'))) {
            this.position = saved_position;
            const keyword_start = this.position;
            this.match_keyword('else');
            this.add_token(TokenType.ELSE, 'else', keyword_start, this.position);
            this.scan_javascript(); // Might have trailing code
        }
        else if (this.match_keyword('elseif') && this.peek_for_colon()) {
            this.position = saved_position;
            const keyword_start = this.position;
            this.match_keyword('elseif');
            this.add_token(TokenType.ELSEIF, 'elseif', keyword_start, this.position);
            this.scan_javascript(); // Scan the condition
        }
        else if (this.match_keyword('endif')) {
            this.position = saved_position;
            const keyword_start = this.position;
            this.match_keyword('endif');
            this.add_token(TokenType.ENDIF, 'endif', keyword_start, this.position);
            this.scan_javascript(); // Might have semicolon
        }
        else if (this.match_keyword('for') && this.peek_for_colon()) {
            this.position = saved_position;
            const keyword_start = this.position;
            this.match_keyword('for');
            this.add_token(TokenType.FOR, 'for', keyword_start, this.position);
            this.scan_javascript(); // Scan the loop expression
        }
        else if (this.match_keyword('endfor')) {
            this.position = saved_position;
            const keyword_start = this.position;
            this.match_keyword('endfor');
            this.add_token(TokenType.ENDFOR, 'endfor', keyword_start, this.position);
            this.scan_javascript(); // Might have semicolon
        }
        else {
            // It's regular JavaScript code - rewind to include whitespace
            this.position = position_with_whitespace;
            this.scan_javascript();
        }
    }
    scan_comment() {
        // Scan comment from <%-- to --%>
        const start = this.position - 4; // Already consumed <%--
        let comment = '';
        while (this.position < this.input.length) {
            if (this.match_sequence('--%>')) {
                // Found end of comment
                // Don't trim - we need to preserve whitespace for line mapping
                this.add_token(TokenType.COMMENT, comment, start, this.position);
                return;
            }
            const char = this.current_char();
            comment += char;
            this.advance();
        }
        // Error: unterminated comment
        throw new JQHTMLParseError('Unterminated comment', this.line, this.column, this.input);
    }
    scan_html_comment() {
        // Scan HTML comment from <!-- to -->
        // Everything inside should be treated as raw text, no parsing
        const start = this.position;
        // Consume <!--
        this.advance(); // <
        this.advance(); // !
        this.advance(); // -
        this.advance(); // -
        let comment = '<!--';
        // Scan until we find -->
        while (this.position < this.input.length) {
            if (this.current_char() === '-' &&
                this.peek_ahead(1) === '-' &&
                this.peek_ahead(2) === '>') {
                // Found end of HTML comment
                comment += '-->';
                this.advance(); // -
                this.advance(); // -
                this.advance(); // >
                // Add the entire HTML comment as a TEXT token
                // This ensures it gets passed through as-is to the output
                this.add_token(TokenType.TEXT, comment, start, this.position);
                return;
            }
            const char = this.current_char();
            comment += char;
            // Track line numbers for error reporting
            if (char === '\n') {
                this.line++;
                this.column = 1;
            }
            else {
                this.column++;
            }
            this.advance();
        }
        // Error: unterminated HTML comment
        throw new JQHTMLParseError('Unterminated HTML comment', this.line, this.column, this.input);
    }
    scan_expression() {
        // After <%=, scan JavaScript until %>
        this.scan_javascript();
    }
    scan_javascript() {
        const start = this.position;
        let code = '';
        let in_string = false;
        let string_delimiter = '';
        let escape_next = false;
        while (this.position < this.input.length) {
            const char = this.current_char();
            // Handle escape sequences in strings
            if (escape_next) {
                code += char;
                this.advance();
                escape_next = false;
                continue;
            }
            // Handle backslash (escape character)
            if (char === '\\' && in_string) {
                escape_next = true;
                code += char;
                this.advance();
                continue;
            }
            // Handle string delimiters
            if ((char === '"' || char === "'" || char === '`') && !in_string) {
                in_string = true;
                string_delimiter = char;
            }
            else if (char === string_delimiter && in_string) {
                in_string = false;
                string_delimiter = '';
            }
            // Only look for %> when not inside a string
            if (!in_string && char === '%' && this.peek_ahead(1) === '>') {
                break;
            }
            code += char;
            this.advance();
        }
        if (code.trim().length > 0) {
            this.add_token(TokenType.JAVASCRIPT, code.trim(), start, this.position);
        }
    }
    scan_component_name() {
        const start = this.position;
        let name = '';
        while (this.position < this.input.length) {
            const char = this.current_char();
            // Component names are alphanumeric with underscores
            if ((char >= 'a' && char <= 'z') ||
                (char >= 'A' && char <= 'Z') ||
                (char >= '0' && char <= '9') ||
                char === '_') {
                name += char;
                this.advance();
            }
            else {
                break;
            }
        }
        if (name.length > 0) {
            this.add_token(TokenType.COMPONENT_NAME, name, start, this.position);
        }
        // Skip whitespace after component name
        this.skip_whitespace();
        // Also skip newlines after component name (for multiline Define tags)
        while (this.current_char() === '\n' || this.current_char() === '\r') {
            if (this.current_char() === '\n') {
                this.add_token(TokenType.NEWLINE, '\n', this.position, this.position + 1);
            }
            this.advance();
            this.skip_whitespace();
        }
        // If we see attributes, scan them
        if (this.is_attribute_start_char(this.current_char())) {
            this.scan_attributes();
        }
        else if (this.current_char() === '>') {
            // Otherwise scan the closing >
            const gt_start = this.position;
            this.advance();
            this.add_token(TokenType.GT, '>', gt_start, this.position);
        }
    }
    scan_slot_name() {
        const start = this.position;
        let name = '';
        while (this.position < this.input.length) {
            const char = this.current_char();
            // Slot names are alphanumeric with underscores, same as components
            if ((char >= 'a' && char <= 'z') ||
                (char >= 'A' && char <= 'Z') ||
                (char >= '0' && char <= '9') ||
                char === '_') {
                name += char;
                this.advance();
            }
            else {
                break;
            }
        }
        if (name.length > 0) {
            this.add_token(TokenType.SLOT_NAME, name, start, this.position);
        }
        // Skip whitespace before attributes or closing
        this.skip_whitespace();
        // For self-closing slots, check for />
        if (this.current_char() === '/' && this.peek_ahead(1) === '>') {
            const slash_start = this.position;
            this.advance(); // consume /
            this.add_token(TokenType.SLASH, '/', slash_start, this.position);
            const gt_start = this.position;
            this.advance(); // consume >
            this.add_token(TokenType.GT, '>', gt_start, this.position);
        }
        else if (this.current_char() === '>') {
            // Regular closing >
            const gt_start = this.position;
            this.advance();
            this.add_token(TokenType.GT, '>', gt_start, this.position);
        }
    }
    match_sequence(sequence) {
        if (this.position + sequence.length > this.input.length) {
            return false;
        }
        for (let i = 0; i < sequence.length; i++) {
            if (this.input[this.position + i] !== sequence[i]) {
                return false;
            }
        }
        // Consume the sequence
        for (let i = 0; i < sequence.length; i++) {
            this.advance();
        }
        return true;
    }
    match_keyword(keyword) {
        const start = this.position;
        // Match the keyword
        for (let i = 0; i < keyword.length; i++) {
            if (this.position + i >= this.input.length ||
                this.input[this.position + i] !== keyword[i]) {
                return false;
            }
        }
        // Ensure it's not part of a larger word
        const next_pos = this.position + keyword.length;
        if (next_pos < this.input.length) {
            const next_char = this.input[next_pos];
            if ((next_char >= 'a' && next_char <= 'z') ||
                (next_char >= 'A' && next_char <= 'Z') ||
                (next_char >= '0' && next_char <= '9') ||
                next_char === '_') {
                return false;
            }
        }
        // Consume the keyword
        for (let i = 0; i < keyword.length; i++) {
            this.advance();
        }
        return true;
    }
    peek_sequence(sequence) {
        if (this.position + sequence.length > this.input.length) {
            return false;
        }
        for (let i = 0; i < sequence.length; i++) {
            if (this.input[this.position + i] !== sequence[i]) {
                return false;
            }
        }
        return true;
    }
    peek_sequence_at(offset, sequence) {
        const start = this.position + offset;
        if (start + sequence.length > this.input.length) {
            return false;
        }
        for (let i = 0; i < sequence.length; i++) {
            if (this.input[start + i] !== sequence[i]) {
                return false;
            }
        }
        return true;
    }
    skip_whitespace() {
        while (this.position < this.input.length) {
            const char = this.current_char();
            if (char === ' ' || char === '\t' || char === '\r') {
                this.advance();
            }
            else {
                break;
            }
        }
    }
    current_char() {
        return this.input[this.position] || '';
    }
    peek_ahead(offset) {
        return this.input[this.position + offset] || '';
    }
    advance() {
        if (this.current_char() === '\n') {
            this.line++;
            this.column = 1;
        }
        else {
            this.column++;
        }
        this.position++;
    }
    add_token(type, value, start, end, line, column) {
        // Calculate start position details
        const startLine = line ?? this.line;
        const startColumn = column ?? this.column;
        // Calculate end position by scanning the value
        let endLine = startLine;
        let endColumn = startColumn;
        let endOffset = end;
        // Count lines and columns in the value to get accurate end position
        for (let i = 0; i < value.length; i++) {
            if (value[i] === '\n') {
                endLine++;
                endColumn = 1;
            }
            else {
                endColumn++;
            }
        }
        // For single character tokens, end column is start + 1
        if (value.length === 1 && value !== '\n') {
            endColumn = startColumn + 1;
        }
        this.tokens.push({
            type,
            value,
            line: startLine, // Keep for backward compatibility
            column: startColumn, // Keep for backward compatibility
            start, // Keep for backward compatibility
            end, // Keep for backward compatibility
            loc: {
                start: {
                    line: startLine,
                    column: startColumn,
                    offset: start
                },
                end: {
                    line: endLine,
                    column: endColumn,
                    offset: endOffset
                }
            }
        });
    }
    is_tag_name_char(char) {
        if (!char)
            return false;
        return (char >= 'a' && char <= 'z') ||
            (char >= 'A' && char <= 'Z');
    }
    is_tag_name_continue_char(char) {
        if (!char)
            return false;
        return this.is_tag_name_char(char) ||
            (char >= '0' && char <= '9') ||
            char === '-' || char === '_' || char === ':';
    }
    scan_opening_tag() {
        const start = this.position;
        this.advance(); // consume <
        this.add_token(TokenType.TAG_OPEN, '<', start, this.position);
        // Scan tag name
        const name_start = this.position;
        let name = '';
        while (this.position < this.input.length &&
            this.is_tag_name_continue_char(this.current_char())) {
            name += this.current_char();
            this.advance();
        }
        if (name.length > 0) {
            this.add_token(TokenType.TAG_NAME, name, name_start, this.position);
        }
        // Scan attributes until > or />
        this.scan_attributes();
    }
    scan_closing_tag() {
        const start = this.position;
        this.advance(); // consume <
        this.advance(); // consume /
        this.add_token(TokenType.TAG_CLOSE, '</', start, this.position);
        // Scan tag name
        const name_start = this.position;
        let name = '';
        while (this.position < this.input.length &&
            this.is_tag_name_continue_char(this.current_char())) {
            name += this.current_char();
            this.advance();
        }
        if (name.length > 0) {
            this.add_token(TokenType.TAG_NAME, name, name_start, this.position);
        }
        // Skip whitespace
        this.skip_whitespace();
        // Expect >
        if (this.current_char() === '>') {
            const gt_start = this.position;
            this.advance();
            this.add_token(TokenType.GT, '>', gt_start, this.position);
        }
    }
    scan_attributes() {
        while (this.position < this.input.length) {
            this.skip_whitespace();
            // Also skip newlines in attribute area
            while (this.current_char() === '\n' || this.current_char() === '\r') {
                if (this.current_char() === '\n') {
                    this.add_token(TokenType.NEWLINE, '\n', this.position, this.position + 1);
                }
                this.advance();
                this.skip_whitespace();
            }
            const char = this.current_char();
            // Check for />
            if (char === '/' && this.peek_ahead(1) === '>') {
                const slash_start = this.position;
                this.advance(); // consume /
                this.advance(); // consume >
                this.add_token(TokenType.SELF_CLOSING, '/>', slash_start, this.position);
                return;
            }
            // Check for >
            if (char === '>') {
                const gt_start = this.position;
                this.advance();
                this.add_token(TokenType.GT, '>', gt_start, this.position);
                return;
            }
            // Must be an attribute
            if (this.is_attribute_start_char(char)) {
                this.scan_attribute();
            }
            else {
                break;
            }
        }
    }
    is_attribute_start_char(char) {
        if (!char)
            return false;
        return this.is_tag_name_char(char) || char === '$' || char === ':' || char === '@';
    }
    peek_for_colon() {
        // Look ahead in the JavaScript to see if there's a colon before %>
        let pos = this.position;
        // Skip whitespace and look for either : or (condition):
        while (pos < this.input.length) {
            const char = this.input[pos];
            // Found %>  before colon
            if (pos + 1 < this.input.length &&
                this.input[pos] === '%' && this.input[pos + 1] === '>') {
                return false;
            }
            // Found colon
            if (char === ':') {
                return true;
            }
            // Skip through parentheses
            if (char === '(') {
                let depth = 1;
                pos++;
                while (pos < this.input.length && depth > 0) {
                    if (this.input[pos] === '(')
                        depth++;
                    if (this.input[pos] === ')')
                        depth--;
                    pos++;
                }
                continue;
            }
            pos++;
        }
        return false;
    }
    scan_attribute() {
        const start = this.position;
        let name = '';
        // Scan attribute name
        while (this.position < this.input.length) {
            const char = this.current_char();
            if (char === '=' || char === ' ' || char === '\t' ||
                char === '\n' || char === '\r' || char === '>' ||
                (char === '/' && this.peek_ahead(1) === '>')) {
                break;
            }
            name += char;
            this.advance();
        }
        if (name.length > 0) {
            this.add_token(TokenType.ATTR_NAME, name, start, this.position);
        }
        this.skip_whitespace();
        // Check for = and value
        if (this.current_char() === '=') {
            const eq_start = this.position;
            this.advance();
            this.add_token(TokenType.EQUALS, '=', eq_start, this.position);
            this.skip_whitespace();
            // Scan attribute value
            this.scan_attribute_value();
        }
    }
    scan_attribute_value() {
        const char = this.current_char();
        if (char === '"' || char === "'") {
            // Check if this is an @ event attribute - they MUST be unquoted
            const attr_context = this.get_current_attribute_context();
            if (attr_context.startsWith('@')) {
                const error = new JQHTMLParseError(`Event attributes (@) must have unquoted values to pass function references.\n` +
                    `  Attribute: ${attr_context}=`, this.line, this.column, this.input);
                error.suggestion = `\n\nEvent attributes must be unquoted:\n` +
                    `  ✗ Wrong:   @click="handleClick"     (passes string, not function)\n` +
                    `  ✓ Correct: @click=handleClick       (passes function reference)\n` +
                    `  ✓ Correct: @click=this.handleClick  (passes method reference)\n\n` +
                    `Quoted values only pass strings and cannot pass functions or callbacks.\n` +
                    `In the component scope, 'this' refers to the component instance.`;
                throw error;
            }
            // Quoted value - check for interpolation
            const quote = char;
            const quote_start = this.position;
            this.advance(); // consume opening quote
            // Check if value contains <%= or <%!=
            if (this.value_contains_interpolation(quote)) {
                // Rewind and scan with interpolation
                this.position = quote_start;
                this.advance(); // skip quote again
                this.scan_interpolated_attribute_value(quote);
            }
            else {
                // Simple value without interpolation
                const value_start = this.position - 1; // Include opening quote
                let value = quote; // Start with the quote
                while (this.position < this.input.length && this.current_char() !== quote) {
                    value += this.current_char();
                    this.advance();
                }
                if (this.current_char() === quote) {
                    value += quote; // Add closing quote
                    this.advance(); // consume closing quote
                }
                if (value.length > 2 || value === '""' || value === "''") {
                    this.add_token(TokenType.ATTR_VALUE, value, value_start, this.position);
                }
            }
        }
        else if (char === '(') {
            // Parenthesized expression: $attr=(condition ? 'online' : 'offline')
            const value_start = this.position;
            let value = '';
            let paren_depth = 0;
            let in_string = false;
            let string_delimiter = '';
            let escape_next = false;
            while (this.position < this.input.length) {
                const ch = this.current_char();
                // Handle escape sequences in strings
                if (escape_next) {
                    value += ch;
                    this.advance();
                    escape_next = false;
                    continue;
                }
                // Handle backslash (escape character) inside strings
                if (ch === '\\' && in_string) {
                    escape_next = true;
                    value += ch;
                    this.advance();
                    continue;
                }
                // Handle string delimiters
                if ((ch === '"' || ch === "'" || ch === '`') && !in_string) {
                    in_string = true;
                    string_delimiter = ch;
                }
                else if (ch === string_delimiter && in_string) {
                    in_string = false;
                    string_delimiter = '';
                }
                // Count parentheses only outside strings
                if (!in_string) {
                    if (ch === '(') {
                        paren_depth++;
                    }
                    else if (ch === ')') {
                        paren_depth--;
                        value += ch;
                        this.advance();
                        // Stop when we close the last parenthesis
                        if (paren_depth === 0) {
                            break;
                        }
                        continue;
                    }
                    // Stop at whitespace or tag end if not inside parentheses
                    if (paren_depth === 0 && (ch === ' ' || ch === '\t' || ch === '\n' ||
                        ch === '\r' || ch === '>' ||
                        (ch === '/' && this.peek_ahead(1) === '>'))) {
                        break;
                    }
                }
                value += ch;
                this.advance();
            }
            if (value.length > 0) {
                this.add_token(TokenType.ATTR_VALUE, value, value_start, this.position);
            }
        }
        else {
            // Unquoted value - JavaScript identifier or member expression
            // Valid chars: alphanumeric, underscore, period, dollar sign
            // Can be prefixed with ! for negation
            // Examples: myVar, this.method, obj.prop.subprop, $element, !this.canEdit
            //
            // RULES:
            // - @ event attributes: MUST be unquoted (to pass functions)
            // - $ attributes: Can be quoted (string) or unquoted (any JS value)
            // - Regular attributes: MUST be quoted (strings only)
            // Check attribute type
            const attr_context = this.get_current_attribute_context();
            const is_event_attr = attr_context.startsWith('@');
            const is_dollar_attr = attr_context.startsWith('$');
            // Regular attributes (not @ or $) must be quoted
            if (!is_event_attr && !is_dollar_attr) {
                const error = new JQHTMLParseError(`Regular HTML attributes must have quoted values.\n` +
                    `  Attribute: ${attr_context}`, this.line, this.column, this.input);
                error.suggestion = `\n\nRegular attributes must be quoted:\n` +
                    `  ✗ Wrong:   ${attr_context}myValue\n` +
                    `  ✓ Correct: ${attr_context}"myValue"\n` +
                    `  ✓ Correct: ${attr_context}"prefix <%= this.data.value %> suffix"\n\n` +
                    `Only @ event attributes (unquoted) and $ attributes (either) allow unquoted values:\n` +
                    `  ✓ Correct: @click=this.handleClick  (passes function reference)\n` +
                    `  ✓ Correct: $data=this.complexObject (passes object)\n` +
                    `  ✓ Correct: $id="my-id"              (passes string)`;
                throw error;
            }
            const value_start = this.position;
            let value = '';
            let isFirstChar = true;
            while (this.position < this.input.length) {
                const ch = this.current_char();
                // Allow ! only as the first character (negation operator)
                if (isFirstChar && ch === '!') {
                    value += ch;
                    this.advance();
                    isFirstChar = false;
                    continue;
                }
                isFirstChar = false;
                // Check if character is valid for JavaScript identifier/member expression/function call
                const isValidChar = (ch >= 'a' && ch <= 'z') ||
                    (ch >= 'A' && ch <= 'Z') ||
                    (ch >= '0' && ch <= '9') ||
                    ch === '_' ||
                    ch === '.' ||
                    ch === '$' ||
                    ch === '(' || // Allow parentheses for function calls
                    ch === ')' ||
                    ch === ',' || // Allow commas in function arguments
                    ch === '"' || // Allow quoted strings in function arguments
                    ch === "'"; // Allow quoted strings in function arguments
                if (!isValidChar) {
                    // Stop at first non-valid character
                    break;
                }
                value += ch;
                this.advance();
            }
            if (value.length > 0) {
                // Validate the pattern before accepting it
                this.validate_unquoted_value(value, attr_context);
                this.add_token(TokenType.ATTR_VALUE, value, value_start, this.position);
            }
        }
    }
    validate_unquoted_value(value, attr_context) {
        // Allowed patterns:
        // 1. Literals: true, false, null, undefined, 123, 45.67
        // 2. Identifiers: myVar, $variable, _private
        // 3. Property chains: obj.prop, MyClass.method, deep.nested.property
        // 4. Function calls: func(), obj.method(), func(arg1, arg2)
        // 5. Chains with calls: obj.method().property.another()
        //
        // NOT allowed:
        // - Operators: +, -, *, /, %, =, ==, ===, &&, ||, etc.
        // - Objects: {key: value}
        // - Arrays: [1, 2, 3]
        // - Ternary: condition ? a : b
        // Check for disallowed operators
        if (/[+\-*/%=<>!&|^~?:]/.test(value)) {
            const error = new JQHTMLParseError(`Operators are not allowed in unquoted $ attribute values.\n` +
                `  Found: ${attr_context}${value}`, this.line, this.column, this.input);
            error.suggestion = `\n\nUnquoted $ attribute values must be simple references or function calls:\n\n` +
                `✓ Allowed patterns:\n` +
                `  - Literals:         $count=42  or  $active=true\n` +
                `  - Variables:        $data=myVariable\n` +
                `  - Property access:  $handler=Controller.method\n` +
                `  - Function calls:   $value=getData()\n` +
                `  - Complex chains:   $fetch=API.users.getAll()\n\n` +
                `✗ Not allowed:\n` +
                `  - Operators:        $value=a+b  (use quoted string or component logic)\n` +
                `  - Ternary:          $class=active?'on':'off'  (use quoted string)\n` +
                `  - Comparisons:      $show=count>5  (handle in component logic)\n\n` +
                `If you need complex expressions, handle them in the component's on_load() or on_ready() method.`;
            throw error;
        }
        // Check for object literals
        if (value.trim().startsWith('{')) {
            const error = new JQHTMLParseError(`Object literals are not allowed in unquoted $ attribute values.\n` +
                `  Found: ${attr_context}${value}`, this.line, this.column, this.input);
            error.suggestion = `\n\nUnquoted $ attribute values cannot contain object literals.\n\n` +
                `If you need to pass an object, create it in the component:\n` +
                `  ✗ Wrong:   $config={key:"value"}\n` +
                `  ✓ Correct: In component: this.data.config = {key: "value"}\n` +
                `            In template:  $config=this.data.config`;
            throw error;
        }
        // Check for array literals
        if (value.trim().startsWith('[')) {
            const error = new JQHTMLParseError(`Array literals are not allowed in unquoted $ attribute values.\n` +
                `  Found: ${attr_context}${value}`, this.line, this.column, this.input);
            error.suggestion = `\n\nUnquoted $ attribute values cannot contain array literals.\n\n` +
                `If you need to pass an array, create it in the component:\n` +
                `  ✗ Wrong:   $items=[1,2,3]\n` +
                `  ✓ Correct: In component: this.data.items = [1, 2, 3]\n` +
                `            In template:  $items=this.data.items`;
            throw error;
        }
        // Validate that parentheses are balanced
        let parenDepth = 0;
        let inString = false;
        let stringChar = '';
        for (let i = 0; i < value.length; i++) {
            const ch = value[i];
            // Track string boundaries
            if ((ch === '"' || ch === "'") && !inString) {
                inString = true;
                stringChar = ch;
            }
            else if (ch === stringChar && inString) {
                inString = false;
                stringChar = '';
            }
            // Only count parentheses outside strings
            if (!inString) {
                if (ch === '(')
                    parenDepth++;
                if (ch === ')')
                    parenDepth--;
                if (parenDepth < 0) {
                    const error = new JQHTMLParseError(`Unmatched closing parenthesis in unquoted $ attribute value.\n` +
                        `  Found: ${attr_context}${value}`, this.line, this.column, this.input);
                    error.suggestion = `\n\nCheck for mismatched parentheses in the attribute value.`;
                    throw error;
                }
            }
        }
        if (parenDepth !== 0) {
            const error = new JQHTMLParseError(`Unmatched opening parenthesis in unquoted $ attribute value.\n` +
                `  Found: ${attr_context}${value}`, this.line, this.column, this.input);
            error.suggestion = `\n\nCheck for mismatched parentheses in the attribute value.`;
            throw error;
        }
        // Validate the overall pattern using regex
        // Pattern: identifier(.identifier)*(( args? ))*
        // This allows: var, obj.prop, func(), obj.method(arg1, arg2).chain().more
        const pattern = /^!?[a-zA-Z_$][a-zA-Z0-9_$]*(\.[a-zA-Z_$][a-zA-Z0-9_$]*|\([^)]*\))*$|^(true|false|null|undefined|\d+(\.\d+)?)$/;
        if (!pattern.test(value)) {
            const error = new JQHTMLParseError(`Invalid syntax in unquoted $ attribute value.\n` +
                `  Found: ${attr_context}${value}`, this.line, this.column, this.input);
            error.suggestion = `\n\nUnquoted $ attribute values must follow these patterns:\n\n` +
                `✓ Allowed:\n` +
                `  - Number literals:  42, 3.14\n` +
                `  - Boolean literals: true, false\n` +
                `  - Null/undefined:   null, undefined\n` +
                `  - Identifiers:      myVar, _private, $jQuery\n` +
                `  - Property chains:  Controller.method, obj.deep.property\n` +
                `  - Function calls:   getData(), API.fetch("url")\n` +
                `  - Mixed chains:     obj.method().property.call()\n\n` +
                `✗ Not allowed:\n` +
                `  - Spaces in names\n` +
                `  - Complex expressions with operators\n` +
                `  - Object or array literals\n\n` +
                `The value should be a simple reference to data, not complex logic.`;
            throw error;
        }
    }
    get_current_attribute_context() {
        // Look back in tokens to find the current attribute name for error reporting
        let i = this.tokens.length - 1;
        while (i >= 0) {
            const token = this.tokens[i];
            if (token.type === TokenType.ATTR_NAME) {
                // The @ or $ is already part of the attribute name
                return token.value + '=';
            }
            // Stop if we hit a tag boundary
            if (token.type === TokenType.TAG_OPEN || token.type === TokenType.TAG_CLOSE) {
                break;
            }
            i--;
        }
        return '';
    }
    value_contains_interpolation(quote) {
        // Look ahead to see if this quoted value contains <%= or <%!=
        let pos = this.position;
        while (pos < this.input.length && this.input[pos] !== quote) {
            if (pos + 2 < this.input.length &&
                this.input[pos] === '<' &&
                this.input[pos + 1] === '%') {
                return true;
            }
            pos++;
        }
        return false;
    }
    scan_interpolated_attribute_value(quote) {
        let text_start = this.position;
        let text = '';
        while (this.position < this.input.length && this.current_char() !== quote) {
            // Check for interpolation start
            if (this.current_char() === '<' && this.peek_ahead(1) === '%') {
                // Save any text before the interpolation
                if (text.length > 0) {
                    this.add_token(TokenType.ATTR_VALUE, text, text_start, this.position);
                    text = '';
                }
                // Check what kind of expression
                if (this.peek_ahead(2) === '!' && this.peek_ahead(3) === '=') {
                    // <%!= expression %>
                    this.advance(); // <
                    this.advance(); // %
                    this.advance(); // !
                    this.advance(); // =
                    this.add_token(TokenType.EXPRESSION_UNESCAPED, '<%!=', this.position - 4, this.position);
                }
                else if (this.peek_ahead(2) === '=') {
                    // <%= expression %>
                    this.advance(); // <
                    this.advance(); // %
                    this.advance(); // =
                    this.add_token(TokenType.EXPRESSION_START, '<%=', this.position - 3, this.position);
                }
                else {
                    // Just add as text
                    text += this.current_char();
                    this.advance();
                    continue;
                }
                // Scan the JavaScript expression
                this.scan_javascript();
                // Consume %>
                if (this.current_char() === '%' && this.peek_ahead(1) === '>') {
                    const tag_end_start = this.position;
                    this.advance(); // %
                    this.advance(); // >
                    this.add_token(TokenType.TAG_END, '%>', tag_end_start, this.position);
                }
                // Reset text tracking
                text_start = this.position;
            }
            else {
                text += this.current_char();
                this.advance();
            }
        }
        // Add any remaining text
        if (text.length > 0) {
            this.add_token(TokenType.ATTR_VALUE, text, text_start, this.position);
        }
        // Consume closing quote
        if (this.current_char() === quote) {
            this.advance();
        }
    }
}
//# sourceMappingURL=lexer.js.map