Class: Herb::Engine::ParserErrorOverlay

Inherits:
Object
  • Object
show all
Defined in:
lib/herb/engine/parser_error_overlay.rb,
sig/herb/engine/parser_error_overlay.rbs

Constant Summary collapse

CONTEXT_LINES =

Returns:

  • (::Integer) 
3
ERROR_CLASS_PRIORITRY =

Returns:

  • (Object) 
[
  Herb::Errors::UnexpectedTokenError,
  Herb::Errors::UnexpectedError,
  Herb::Errors::RubyParseError,
  Herb::Errors::TagNamesMismatchError,
  Herb::Errors::VoidElementClosingTagError,
  Herb::Errors::UnclosedElementError,
  Herb::Errors::MissingClosingTagError,
  Herb::Errors::MissingOpeningTagError,
  Herb::Errors::MissingAttributeValueError
].freeze

Instance Method Summary collapse

Constructor Details

#initialize(source, errors, filename: nil) ⇒ ParserErrorOverlay

Returns a new instance of ParserErrorOverlay.

Parameters:

  • source (Object)
  • errors (Object)
  • filename: (Object) (defaults to: nil) 


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# File 'lib/herb/engine/parser_error_overlay.rb', line 20

def initialize(source, errors, filename: nil)
  @source = source
  @errors = errors.sort_by { |error|
    [ERROR_CLASS_PRIORITRY.index(error.class) || -1, error.location.start.line, error.location.start.column]
  }
  @filename = filename || "unknown"
  @lines = source.lines
end

Instance Method Details

#escape_html(text) ⇒ Object

Parameters:

  • text (Object)

Returns:

  • (Object) 


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# File 'lib/herb/engine/parser_error_overlay.rb', line 761

def escape_html(text)
  text.to_s
      .gsub("&", "&")
      .gsub("<", "&lt;")
      .gsub(">", "&gt;")
      .gsub('"', "&quot;")
      .gsub("'", "&#39;")
end

#generate_code_lines(error, line_num, col_num) ⇒ Object

Parameters:

  • error (Object)
  • line_num (Object)
  • col_num (Object)

Returns:

  • (Object) 


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# File 'lib/herb/engine/parser_error_overlay.rb', line 484

def generate_code_lines(error, line_num, col_num)
  start_line = [line_num - CONTEXT_LINES, 1].max
  end_line = [line_num + CONTEXT_LINES, @lines.length].min

  lines_html = [] #: Array[String]

  (start_line..end_line).each do |i|
    line = @lines[i - 1] || ""
    line_str = line.chomp
    is_error_line = i == line_num

    line_class = is_error_line ? "herb-code-line herb-error-line" : "herb-code-line"

    lines_html << <<~HTML
      <div class="#{line_class}">
        <div class="herb-line-number">#{i}</div>
        <div class="herb-line-content">#{syntax_highlight(line_str)}</div>
      </div>
    HTML

    next unless is_error_line && col_num.positive?

    pointer_text = "^#{"~" * [line_str.length - col_num, 0].max}"
    hint = get_inline_hint(error)
    pointer_display = hint ? "#{pointer_text} #{hint}" : pointer_text

    lines_html << <<~HTML
      <div class="herb-error-pointer">#{" " * (col_num - 1)}#{escape_html(pointer_display)}</div>
    HTML
  end

  lines_html.join("\n")
end

#generate_code_section(error, index) ⇒ Object

Parameters:

  • error (Object)
  • index (Object)

Returns:

  • (Object) 


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# File 'lib/herb/engine/parser_error_overlay.rb', line 447

def generate_code_section(error, index)
  location = error.respond_to?(:location) && error.location ? error.location : nil
  line_num = 1
  col_num = 1

  if location.respond_to?(:start) && location.is_a?(Herb::Location) && location.start
    line_num = location.start.line
    col_num = location.start.column
  end

  error_class = error.class.name.split("::").last.gsub(/Error$/, "")
  error_message = error.respond_to?(:message) ? error.message : error.to_s

  header_text = if @errors.length == 1
                  "#{@filename}:#{line_num}:#{col_num}"
                else
                  "Error #{index + 1}: #{error_class} - #{@filename}:#{line_num}:#{col_num}"
                end

  code_lines = generate_code_lines(error, line_num, col_num)

  <<~HTML
    <div class="herb-code-section">
      <div class="herb-code-header">
        <div class="herb-file-icon">ERB</div>
        #{escape_html(header_text)}
      </div>
      <div class="herb-error-message-section">
        <div class="herb-error-message">#{escape_html(error_message)}</div>
      </div>
      <div class="herb-code-content">
        #{code_lines}
      </div>
    </div>
  HTML
end

#generate_error_sections ⇒ Object

Returns:

  • (Object) 


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# File 'lib/herb/engine/parser_error_overlay.rb', line 433

def generate_error_sections
  sections = [] #: Array[String]

  @errors.each_with_index do |error, index|
    sections << generate_code_section(error, index)
  end

  suggestions = @errors.map { |error| get_error_suggestion(error) }.compact

  sections << generate_suggestions_section(suggestions) if suggestions.any?

  sections.uniq.join("\n")
end

#generate_html ⇒ Object

Returns:

  • (Object) 


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# File 'lib/herb/engine/parser_error_overlay.rb', line 29

def generate_html
  return "" if @errors.empty?

  error_count = @errors.length
  error_title = error_count == 1 ? "Template Error" : "Template Errors (#{error_count})"

  primary_error = @errors.first
  error_message = primary_error.respond_to?(:message) ? primary_error.message : primary_error.to_s

  <<~HTML
    <div class="herb-parser-error-overlay">
      <style>
        .herb-parser-error-overlay * {
          margin: 0;
          padding: 0;
          box-sizing: border-box;
        }

        .herb-parser-error-overlay {
          position: fixed;
          top: 0;
          left: 0;
          right: 0;
          bottom: 0;
          background: rgba(0, 0, 0, 0.8);
          backdrop-filter: blur(4px);
          z-index: 9999;
          display: flex;
          align-items: center;
          justify-content: center;
          padding: 20px;
          font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
          color: #e5e5e5;
          line-height: 1.6;
        }

        .herb-parser-error-overlay .herb-error-container {
          background: #000000;
          border: 1px solid #374151;
          border-radius: 12px;
          box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
          max-width: 1200px;
          max-height: 80vh;
          width: 100%;
          display: flex;
          flex-direction: column;
          overflow: hidden;
        }

        .herb-parser-error-overlay .herb-error-header {
          background: linear-gradient(135deg, #dc2626, #b91c1c);
          padding: 20px 24px;
          border-bottom: 1px solid #374151;
          border-radius: 12px 12px 0 0;
          flex-shrink: 0;
          display: flex;
          justify-content: space-between;
          align-items: flex-start;
          gap: 16px;
        }

        .herb-parser-error-overlay .herb-error-header-content {
          flex: 1;
          min-width: 0;
        }

        .herb-parser-error-overlay .herb-error-title {
          font-size: 18px;
          font-weight: 600;
          color: white;
          margin-bottom: 8px;
          display: flex;
          align-items: center;
          gap: 12px;
        }

        .herb-parser-error-overlay .herb-error-icon {
          width: 20px;
          height: 20px;
          background: white;
          border-radius: 50%;
          display: flex;
          align-items: center;
          justify-content: center;
          font-size: 12px;
          color: #dc2626;
          font-weight: bold;
        }

        .herb-parser-error-overlay .herb-error-message {
          font-size: 14px;
          color: rgba(255, 255, 255, 0.9);
          font-weight: 400;
        }

        .herb-parser-error-overlay .herb-error-message-section {
          background: #1a1a1a;
          border-bottom: 1px solid #374151;
          padding: 12px 16px;
        }

        .herb-parser-error-overlay .herb-error-message-section .herb-error-message {
          font-size: 13px;
          color: #fbbf24;
          font-weight: 500;
          line-height: 1.4;
        }

        .herb-parser-error-overlay .herb-error-content {
          flex: 1;
          overflow-y: auto;
          padding: 24px;
          display: flex;
          flex-direction: column;
          gap: 24px;
        }

        .herb-parser-error-overlay .herb-code-section {
          background: #111111;
          border: 1px solid #374151;
          border-radius: 8px;
        }

        .herb-parser-error-overlay .herb-code-header {
          background: #262626;
          padding: 12px 16px;
          border-bottom: 1px solid #374151;
          font-size: 13px;
          color: #9ca3af;
          display: flex;
          align-items: center;
          gap: 8px;
        }

        .herb-parser-error-overlay .herb-file-icon {
          width: 20px;
          height: 20px;
          background: #008000;
          border-radius: 2px;
          display: flex;
          align-items: center;
          justify-content: center;
          font-size: 8px;
          color: white;
          padding: 2px;
        }

        .herb-parser-error-overlay .herb-code-content {
          padding: 16px;
          overflow-x: auto;
        }

        .herb-parser-error-overlay .herb-code-line {
          display: flex;
          align-items: flex-start;
          min-height: 20px;
          font-size: 13px;
          line-height: 1.5;
        }

        .herb-parser-error-overlay .herb-line-number {
          color: #6b7280;
          width: 40px;
          text-align: right;
          padding-right: 16px;
          user-select: none;
          flex-shrink: 0;
        }

        .herb-parser-error-overlay .herb-line-content {
          flex: 1;
          white-space: pre;
          font-family: inherit;
        }

        .herb-parser-error-overlay .herb-error-line {
          background: rgba(220, 38, 38, 0.1);
          border-left: 3px solid #dc2626;
          margin: 0 -16px;
          padding: 0 16px;
        }

        .herb-parser-error-overlay .herb-error-line .herb-line-number {
          color: #dc2626;
          font-weight: 600;
        }

        .herb-parser-error-overlay .herb-error-line .herb-line-content {
          color: #fecaca;
        }

        .herb-parser-error-overlay .herb-error-pointer {
          color: #dc2626;
          font-weight: bold;
          margin-left: 40px;
          padding-left: 16px;
          font-size: 12px;
        }

        .herb-parser-error-overlay .herb-section {
          background: #111111;
          border: 1px solid #374151;
          border-radius: 8px;
          overflow: hidden;
        }

        .herb-parser-error-overlay .herb-section-header {
          background: #262626;
          padding: 12px 16px;
          border-bottom: 1px solid #374151;
          cursor: pointer;
          display: flex;
          align-items: center;
          justify-content: space-between;
          font-size: 14px;
          font-weight: 500;
          color: #e5e5e5;
          transition: background-color 0.2s;
        }

        .herb-parser-error-overlay .herb-section-header:hover {
          background: #2d2d2d;
        }

        .herb-parser-error-overlay .herb-section-toggle {
          transition: transform 0.2s;
        }

        .herb-parser-error-overlay .herb-section-toggle.collapsed {
          transform: rotate(-90deg);
        }

        .herb-parser-error-overlay .herb-section-content {
          padding: 16px;
          font-size: 13px;
          line-height: 1.6;
          max-height: 300px;
          overflow-y: auto;
        }

        .herb-parser-error-overlay .herb-section-content.collapsed {
          display: none;
        }

        .herb-parser-error-overlay .herb-suggestions {
          color: #d1d5db;
        }

        .herb-parser-error-overlay .herb-suggestion-item {
          margin-bottom: 12px;
          padding-left: 16px;
          position: relative;
        }

        .herb-parser-error-overlay .herb-suggestion-item::before {
          content: "•";
          color: #10b981;
          position: absolute;
          left: 0;
          font-weight: bold;
        }

        .herb-parser-error-overlay .herb-suggestion-title {
          color: #10b981;
          font-weight: 500;
          margin-bottom: 4px;
        }

        /* Syntax highlighting */
        .herb-parser-error-overlay .herb-keyword { color: #c678dd; }
        .herb-parser-error-overlay .herb-string { color: #98c379; }
        .herb-parser-error-overlay .herb-comment { color: #5c6370; font-style: italic; }
        .herb-parser-error-overlay .herb-tag { color: #e06c75; }
        .herb-parser-error-overlay .herb-attr { color: #d19a66; }
        .herb-parser-error-overlay .herb-value { color: #98c379; }
        .herb-parser-error-overlay .herb-erb {
          color: #61dafb;
          background: rgba(97, 218, 251, 0.1);
          padding: 2px 4px;
          border-radius: 3px;
        }

        @media (max-width: 768px) {
          .herb-parser-error-overlay {
            padding: 10px;
          }

          .herb-parser-error-overlay .herb-error-container {
            max-height: 90vh;
          }

          .herb-parser-error-overlay .herb-error-content {
            padding: 16px;
            gap: 16px;
          }

          .herb-parser-error-overlay .herb-error-header {
            padding: 16px;
            flex-direction: column;
            align-items: flex-start;
            gap: 12px;
          }
        }
      </style>

      <div class="herb-error-container">
        <div class="herb-error-header">
          <div class="herb-error-header-content">
            <div class="herb-error-title">
              <div class="herb-error-icon">!</div>
              #{escape_html(error_title)}
            </div>
            <div class="herb-error-message">
              #{escape_html(error_message)}
            </div>
          </div>
        </div>

        <div class="herb-error-content">
          #{generate_error_sections}
        </div>
      </div>

      <script>
        (function() {
          function toggleSection(sectionId) {
            const content = document.getElementById(sectionId + '-content');
            const toggle = document.getElementById(sectionId + '-toggle');

            if (content && toggle) {
              if (content.classList.contains('collapsed')) {
                content.classList.remove('collapsed');
                toggle.classList.remove('collapsed');
                toggle.textContent = '▼';
              } else {
                content.classList.add('collapsed');
                toggle.classList.add('collapsed');
                toggle.textContent = '▶';
              }
            }
          }

          function closeErrorOverlay() {
            const overlay = document.querySelector('.herb-parser-error-overlay');
            if (overlay) overlay.style.display = 'none';
          }

          // Setup close button
          const closeBtn = document.querySelector('.herb-close-button');
          if (closeBtn) {
            closeBtn.addEventListener('click', closeErrorOverlay);
          }

          // Close when clicking on backdrop (outside the container)
          const overlay = document.querySelector('.herb-parser-error-overlay');
          const container = document.querySelector('.herb-error-container');
          if (overlay && container) {
            overlay.addEventListener('click', function(e) {
              if (e.target === overlay) {
                closeErrorOverlay();
              }
            });
          }

          // Setup section toggles
          document.querySelectorAll('.herb-section-header').forEach(header => {
            header.addEventListener('click', function() {
              const sectionId = this.getAttribute('data-section-id');
              if (sectionId) toggleSection(sectionId);
            });
          });

          // Close on Escape key
          document.addEventListener('keydown', function(e) {
            if (e.key === 'Escape') {
              closeErrorOverlay();
            }
          });

          // Prevent body scroll when overlay is open
          document.body.style.overflow = 'hidden';

          // Restore scroll when closed (cleanup for navigation)
          const overlay = document.querySelector('.herb-parser-error-overlay');
          if (overlay) {
            const observer = new MutationObserver(function(mutations) {
              mutations.forEach(function(mutation) {
                if (mutation.type === 'attributes' && mutation.attributeName === 'style') {
                  if (overlay.style.display === 'none') {
                    document.body.style.overflow = '';
                  }
                }
              });
            });
            observer.observe(overlay, { attributes: true });
          }
        })();
      </script>
    </div>
  HTML
end

#generate_suggestions_section(suggestions) ⇒ Object

Parameters:

  • suggestions (Object)

Returns:

  • (Object) 


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# File 'lib/herb/engine/parser_error_overlay.rb', line 518

def generate_suggestions_section(suggestions)
  suggestion_items = suggestions.map do |suggestion|
    title, description = suggestion.split(": ", 2)
    title ||= "Suggestion"
    description ||= suggestion

    <<~HTML
      <div class="herb-suggestion-item">
        <div class="herb-suggestion-title">#{escape_html(title)}</div>
        <div>#{escape_html(description)}</div>
      </div>
    HTML
  end

  section_id = "suggestions-#{Digest::MD5.hexdigest(suggestions.inspect)}"

  <<~HTML
    <div class="herb-section">
      <div class="herb-section-header" data-section-id="#{section_id}">
        Suggestions
        <span class="herb-section-toggle" id="#{section_id}-toggle">▼</span>
      </div>
      <div class="herb-section-content" id="#{section_id}-content">
        <div class="herb-suggestions">
          #{suggestion_items.join}
        </div>
      </div>
    </div>
  HTML
end

#get_character_offset(code, line, column) ⇒ Object

Parameters:

  • code (Object)
  • line (Object)
  • column (Object)

Returns:

  • (Object) 


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# File 'lib/herb/engine/parser_error_overlay.rb', line 605

def get_character_offset(code, line, column)
  lines = code.lines
  offset = 0

  (1...line).each do |line_num|
    offset += lines[line_num - 1]&.length || 0
  end

  offset + column
end

#get_error_suggestion(error) ⇒ Object

Parameters:

  • error (Object)

Returns:

  • (Object) 


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# File 'lib/herb/engine/parser_error_overlay.rb', line 698

def get_error_suggestion(error)
  case error
  when Herb::Errors::MissingClosingTagError
    if error.respond_to?(:opening_tag) && error.opening_tag
      "Add missing closing tag: Add </#{error.opening_tag.value}> to close the opening tag"
    else
      "Add missing closing tag: Add the missing closing tag"
    end
  when Herb::Errors::MissingOpeningTagError
    if error.respond_to?(:closing_tag) && error.closing_tag
      "Add missing opening tag: Add <#{error.closing_tag.value}> before the closing tag"
    else
      "Add missing opening tag: Add the missing opening tag"
    end
  when Herb::Errors::TagNamesMismatchError
    if error.respond_to?(:opening_tag) && error.respond_to?(:closing_tag) && error.opening_tag && error.closing_tag
      "Fix tag mismatch: Change </#{error.closing_tag.value}> to </#{error.opening_tag.value}>"
    else
      "Fix tag mismatch: Ensure opening and closing tags match"
    end
  when Herb::Errors::VoidElementClosingTagError
    if error.respond_to?(:tag_name) && error.tag_name
      "Remove illegal closing tag: Remove the closing tag for void element <#{error.tag_name.value}>"
    else
      "Remove illegal closing tag: Remove the closing tag for this void element"
    end
  when Herb::Errors::UnclosedElementError
    if error.respond_to?(:opening_tag) && error.opening_tag
      "Close unclosed element: Add </#{error.opening_tag.value}> before the end of the template"
    else
      "Close unclosed element: Close the unclosed element"
    end
  when Herb::Errors::RubyParseError
    "Fix Ruby syntax: Check your Ruby syntax inside the ERB tag"
  when Herb::Errors::MissingAttributeValueError
    if error.respond_to?(:attribute_name) && error.attribute_name
      "Add attribute value: Add a value after the equals sign for '#{error.attribute_name}' or remove the equals sign"
    else
      "Add attribute value: Add a value after the equals sign or remove the equals sign"
    end
  else
    message = error.respond_to?(:message) ? error.message : error.to_s
    "Fix error: #{message}"
  end
end

#get_inline_hint(error) ⇒ Object

Parameters:

  • error (Object)

Returns:

  • (Object) 


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# File 'lib/herb/engine/parser_error_overlay.rb', line 744

def get_inline_hint(error)
  case error
  when Herb::Errors::MissingClosingTagError
    "← Missing closing tag"
  when Herb::Errors::TagNamesMismatchError
    "← Tag mismatch"
  when Herb::Errors::UnclosedElementError
    "← Unclosed element"
  when Herb::Errors::VoidElementClosingTagError
    "← Void element cannot be closed"
  when Herb::Errors::RubyParseError
    "← Ruby syntax error"
  when Herb::Errors::MissingAttributeValueError
    "← Missing attribute value"
  end
end

#get_token_css_class(state, token, token_text) ⇒ Object

Parameters:

  • state (Object)
  • token (Object)
  • token_text (Object)

Returns:

  • (Object) 


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# File 'lib/herb/engine/parser_error_overlay.rb', line 672

def get_token_css_class(state, token, token_text)
  if state[:in_comment] && !["TOKEN_HTML_COMMENT_START", "TOKEN_HTML_COMMENT_END", "TOKEN_ERB_START",
                             "TOKEN_ERB_CONTENT", "TOKEN_ERB_END"].include?(token.type)
    return "comment"
  end

  case token.type
  when "TOKEN_ERB_START", "TOKEN_ERB_CONTENT", "TOKEN_ERB_END"
    "erb"
  when "TOKEN_HTML_COMMENT_START", "TOKEN_HTML_COMMENT_END"
    "comment"
  when "TOKEN_HTML_TAG_START", "TOKEN_HTML_TAG_END", "TOKEN_HTML_TAG_START_CLOSE", "TOKEN_HTML_TAG_SELF_CLOSE"
    "tag"
  when "TOKEN_IDENTIFIER"
    if state[:in_tag] && token_text == state[:tag_name]
      "tag"
    elsif state[:in_tag] && (state[:expecting_attribute_name] || state[:expecting_attribute_value])
      state[:in_quotes] ? "value" : "attr"
    end
  when "TOKEN_QUOTE"
    state[:in_tag] ? "value" : nil
  when "TOKEN_STRING"
    state[:in_tag] ? "value" : "string"
  end
end

#highlight_with_tokens(tokens, code) ⇒ Object

Parameters:

  • tokens (Object)
  • code (Object)

Returns:

  • (Object) 


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# File 'lib/herb/engine/parser_error_overlay.rb', line 560

def highlight_with_tokens(tokens, code)
  return escape_html(code) if tokens.empty?

  highlighted = ""
  last_end = 0

  state = {
    in_tag: false,
    in_comment: false,
    tag_name: "",
    is_closing_tag: false,
    expecting_attribute_name: false,
    expecting_attribute_value: false,
    in_quotes: false,
  }

  tokens.each_with_index do |token, i|
    next_token = tokens[i + 1]
    prev_token = tokens[i - 1]

    start_offset = get_character_offset(code, token.location.start.line, token.location.start.column)
    end_offset = get_character_offset(code, token.location.end.line, token.location.end.column)

    highlighted += escape_html(code[last_end...start_offset]) if start_offset > last_end

    token_text = code[start_offset...end_offset]

    update_highlighting_state(state, token, token_text, next_token, prev_token)

    css_class = get_token_css_class(state, token, token_text)

    highlighted += if css_class
                     "<span class=\"herb-#{css_class}\">#{escape_html(token_text)}</span>"
                   else
                     escape_html(token_text)
                   end

    last_end = end_offset
  end

  highlighted += escape_html(code[last_end..]) if last_end < code.length

  highlighted
end

#syntax_highlight(code) ⇒ Object

Parameters:

  • code (Object)

Returns:

  • (Object) 


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# File 'lib/herb/engine/parser_error_overlay.rb', line 549

def syntax_highlight(code)
  lex_result = ::Herb.lex(code)

  return escape_html(code) if lex_result.errors.any?

  tokens = lex_result.value
  highlight_with_tokens(tokens, code)
rescue StandardError
  escape_html(code)
end

#update_highlighting_state(state, token, token_text, _next_token, _prev_token) ⇒ Object

Parameters:

  • state (Object)
  • token (Object)
  • token_text (Object)
  • _next_token (Object)
  • _prev_token (Object)

Returns:

  • (Object) 


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# File 'lib/herb/engine/parser_error_overlay.rb', line 616

def update_highlighting_state(state, token, token_text, _next_token, _prev_token)
  case token.type
  when "TOKEN_HTML_TAG_START"
    state[:in_tag] = true
    state[:is_closing_tag] = false
    state[:expecting_attribute_name] = false
    state[:expecting_attribute_value] = false

  when "TOKEN_HTML_TAG_START_CLOSE"
    state[:in_tag] = true
    state[:is_closing_tag] = true
    state[:expecting_attribute_name] = false
    state[:expecting_attribute_value] = false

  when "TOKEN_HTML_TAG_END", "TOKEN_HTML_TAG_SELF_CLOSE"
    state[:in_tag] = false
    state[:tag_name] = ""
    state[:is_closing_tag] = false
    state[:expecting_attribute_name] = false
    state[:expecting_attribute_value] = false

  when "TOKEN_IDENTIFIER"
    if state[:in_tag] && state[:tag_name].empty?
      state[:tag_name] = token_text
      state[:expecting_attribute_name] = !state[:is_closing_tag]
    elsif state[:in_tag] && state[:expecting_attribute_name]
      state[:expecting_attribute_name] = false
      state[:expecting_attribute_value] = true
    end

  when "TOKEN_EQUALS"
    state[:expecting_attribute_value] = true if state[:in_tag]

  when "TOKEN_QUOTE"
    if state[:in_tag]
      state[:in_quotes] = !state[:in_quotes]
      unless state[:in_quotes]
        state[:expecting_attribute_name] = true
        state[:expecting_attribute_value] = false
      end
    end

  when "TOKEN_WHITESPACE"
    if state[:in_tag] && !state[:in_quotes] && !state[:tag_name].empty?
      state[:expecting_attribute_name] = true
      state[:expecting_attribute_value] = false
    end

  when "TOKEN_HTML_COMMENT_START"
    state[:in_comment] = true

  when "TOKEN_HTML_COMMENT_END"
    state[:in_comment] = false
  end
end