Class: SvgConform::SemanticComparator

Inherits:
Object
  • Object
show all
Defined in:
lib/svg_conform/semantic_comparator.rb

Overview

Semantic comparison engine for comparing validation results and remediated content

Class Method Summary collapse

Class Method Details

.calculate_compatibility_score(comparison) ⇒ Object

Calculate compatibility score



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# File 'lib/svg_conform/semantic_comparator.rb', line 405

def self.calculate_compatibility_score(comparison)
  # Handle mixed mode scenarios differently
  return calculate_mixed_mode_compatibility_score(comparison) if comparison[:mixed_mode]

  validity_score = comparison[:overall_validity][:match] ? 1.0 : 0.0

  # Separate validation issues from informational issues
  validation_issues = {}
  informational_issues = {}

  comparison[:semantic_issues].each do |key, issue|
    if key.start_with?("style_promotion:", "informative:")
      informational_issues[key] = issue
    else
      validation_issues[key] = issue
    end
  end

  # Calculate semantic issues score for validation issues only
  if validation_issues.empty?
    semantic_score = 1.0
  else
    semantic_scores = validation_issues.values.map do |issue|
      issue[:semantic_match] ? 1.0 : 0.0
    end
    semantic_score = semantic_scores.sum / semantic_scores.length
  end

  # Calculate coverage score excluding informational issues
  total_svg_conform = comparison[:detailed_mapping][:total_svg_conform]
  total_svgcheck = comparison[:detailed_mapping][:total_svgcheck]

  # Subtract informational issues from both totals
  informational_svg_conform = informational_issues.values.sum do |issue|
    issue[:svg_conform]
  end
  informational_svgcheck = informational_issues.values.sum do |issue|
    issue[:svgcheck]
  end

  validation_svg_conform_total = total_svg_conform - informational_svg_conform
  validation_svgcheck_total = total_svgcheck - informational_svgcheck

  # Coverage score: how well do we cover the validation issues?
  # If SvgConform finds more issues than svgcheck, that's not a penalty
  coverage_score = if validation_svgcheck_total.positive?
                     # Standard case: measure how much of svgcheck we cover
                     [
                       validation_svg_conform_total.to_f / validation_svgcheck_total, 1.0
                     ].min
                   elsif validation_svg_conform_total.positive?
                     # SvgConform finds issues but svgcheck doesn't - this is fine (more strict)
                     1.0
                   else
                     # Both find no validation issues - perfect
                     1.0
                   end

  # Prioritize semantic matching over requirement categorization
  # Validity: 20%, Semantic Issues: 60%, Coverage: 20%
  (validity_score * 0.2 + semantic_score * 0.6 + coverage_score * 0.2).round(3)
end

.calculate_mixed_mode_compatibility_score(comparison) ⇒ Object

Calculate compatibility score for mixed mode scenarios



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# File 'lib/svg_conform/semantic_comparator.rb', line 469

def self.calculate_mixed_mode_compatibility_score(comparison)
  # In mixed mode, one tool succeeded and one failed
  # Focus on complementary validation rather than exact overlap

  # Separate validation issues from informational issues
  validation_issues = {}
  informational_issues = {}

  comparison[:semantic_issues].each do |key, issue|
    if key.start_with?("style_promotion:", "informative:")
      informational_issues[key] = issue
    else
      validation_issues[key] = issue
    end
  end

  # Calculate semantic overlap score (exact matches)
  if validation_issues.empty?
    semantic_overlap_score = 1.0
  else
    semantic_matches = validation_issues.values.count do |issue|
      issue[:semantic_match]
    end
    total_unique_issues = validation_issues.size
    semantic_overlap_score = semantic_matches.to_f / total_unique_issues
  end

  # Calculate complementary validation score with improved logic
  # Give significant credit when tools detect different but valid issues
  total_svg_conform = comparison[:detailed_mapping][:total_svg_conform]
  total_svgcheck = comparison[:detailed_mapping][:total_svgcheck]

  # Subtract informational issues from both totals
  informational_svg_conform = informational_issues.values.sum do |issue|
    issue[:svg_conform]
  end
  informational_svgcheck = informational_issues.values.sum do |issue|
    issue[:svgcheck]
  end

  validation_svg_conform_total = total_svg_conform - informational_svg_conform
  validation_svgcheck_total = total_svgcheck - informational_svgcheck

  # Count common issues (both tools detected)
  common_issues = comparison[:detailed_mapping][:common].size

  # Enhanced complementary validation scoring
  # Give high credit when both tools find issues, even if different types
  complementary_score = if validation_svg_conform_total.positive? && validation_svgcheck_total.positive?
                          # Both tools found validation issues - excellent complementary coverage
                          # Base score of 0.8, with bonus for common issues
                          base_score = 0.8
                          common_bonus = common_issues.positive? ? 0.15 : 0.0
                          [base_score + common_bonus, 1.0].min
                        elsif validation_svg_conform_total.positive? || validation_svgcheck_total.positive?
                          # One tool found issues - partial coverage
                          0.7
                        else
                          # Neither found validation issues - perfect (but unlikely in mixed mode)
                          1.0
                        end

  # Mixed mode remediation success bonus - enhanced
  # In mixed mode, successful remediation by either tool is valuable
  remediation_success_bonus = if comparison[:overall_validity][:svg_conform] || comparison[:overall_validity][:svgcheck]
                                # One tool successfully remediated the file
                                # Higher bonus if both tools found issues but one succeeded
                                if validation_svg_conform_total.positive? && validation_svgcheck_total.positive?
                                  0.5  # Both found issues, one succeeded - excellent
                                else
                                  0.4  # Standard remediation success
                                end
                              else
                                # Neither tool achieved validity (shouldn't happen in mixed mode)
                                0.0
                              end

  # Enhanced mixed mode scoring with higher weight on complementary validation
  # Semantic Overlap: 25%, Complementary Validation: 50%, Remediation Success: 25%
  # This better rewards comprehensive validation coverage
  (semantic_overlap_score * 0.25 + complementary_score * 0.5 + remediation_success_bonus * 0.25).round(3)
end

.calculate_semantic_equivalence(features1, features2) ⇒ Object

Calculate semantic equivalence



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# File 'lib/svg_conform/semantic_comparator.rb', line 750

def self.calculate_semantic_equivalence(features1, features2)
  structure_score = features1[:structure][:elements] == features2[:structure][:elements] ? 1.0 : 0.0
  namespace_score = features1[:namespaces] == features2[:namespaces] ? 1.0 : 0.0
  content_score = features1[:content] == features2[:content] ? 1.0 : 0.0

  # Weighted average
  (structure_score * 0.4 + namespace_score * 0.3 + content_score * 0.3).round(3)
end

.compare_attributes(attrs1, attrs2) ⇒ Object

Compare attributes



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# File 'lib/svg_conform/semantic_comparator.rb', line 687

def self.compare_attributes(attrs1, attrs2)
  all_keys = (attrs1.keys + attrs2.keys).uniq

  matches = all_keys.map do |key|
    values1 = attrs1[key] || []
    values2 = attrs2[key] || []
    values1.sort == values2.sort
  end

  {
    exact_match: matches.all?,
    partial_match_ratio: matches.count(true).to_f / matches.length,
    differing_attributes: all_keys.select.with_index { |_, i| !matches[i] },
  }
end

.compare_content(content1, content2) ⇒ Object

Compare content



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# File 'lib/svg_conform/semantic_comparator.rb', line 704

def self.compare_content(content1, content2)
  {
    text_match: content1[:text_nodes].sort == content2[:text_nodes].sort,
    cdata_match: content1[:cdata_sections].sort == content2[:cdata_sections].sort,
  }
end

.compare_hierarchy(hier1, hier2) ⇒ Object

Compare hierarchy



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# File 'lib/svg_conform/semantic_comparator.rb', line 674

def self.compare_hierarchy(hier1, hier2)
  return true if hier1.nil? && hier2.nil?
  return false if hier1.nil? || hier2.nil?

  return false unless hier1[:name] == hier2[:name]
  return false unless hier1[:children].length == hier2[:children].length

  hier1[:children].zip(hier2[:children]).all? do |child1, child2|
    compare_hierarchy(child1, child2)
  end
end

.compare_namespaces(ns1, ns2) ⇒ Object

Compare namespaces



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# File 'lib/svg_conform/semantic_comparator.rb', line 712

def self.compare_namespaces(ns1, ns2)
  {
    exact_match: ns1 == ns2,
    common_namespaces: ns1.keys & ns2.keys,
    svg_conform_only: ns1.keys - ns2.keys,
    svgcheck_only: ns2.keys - ns1.keys,
  }
end

.compare_remediated_content(svg_conform_content, svgcheck_content) ⇒ Object

Compare remediated SVG content semantically



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# File 'lib/svg_conform/semantic_comparator.rb', line 44

def self.compare_remediated_content(svg_conform_content, svgcheck_content)
  # Parse both SVG documents
  svg_conform_doc = parse_svg_safely(svg_conform_content)
  svgcheck_doc = parse_svg_safely(svgcheck_content)

  return { error: "Failed to parse SVG content" } if svg_conform_doc.nil? || svgcheck_doc.nil?

  # Extract semantic features from both documents
  svg_conform_features = extract_svg_features(svg_conform_doc)
  svgcheck_features = extract_svg_features(svgcheck_doc)

  # Compare features
  {
    structure_match: compare_structure(svg_conform_features[:structure],
                                       svgcheck_features[:structure]),
    attributes_match: compare_attributes(svg_conform_features[:attributes],
                                         svgcheck_features[:attributes]),
    content_match: compare_content(svg_conform_features[:content],
                                   svgcheck_features[:content]),
    namespace_match: compare_namespaces(svg_conform_features[:namespaces],
                                        svgcheck_features[:namespaces]),
    style_match: compare_styles(svg_conform_features[:styles],
                                svgcheck_features[:styles]),
    semantic_equivalence: calculate_semantic_equivalence(
      svg_conform_features, svgcheck_features
    ),
  }
end

.compare_requirement_coverage(svg_conform_reqs, svgcheck_reqs) ⇒ Object

Compare requirement coverage



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# File 'lib/svg_conform/semantic_comparator.rb', line 295

def self.compare_requirement_coverage(svg_conform_reqs, svgcheck_reqs)
  all_requirements = (svg_conform_reqs.keys + svgcheck_reqs.keys).uniq

  coverage = {}
  all_requirements.each do |req|
    svg_count = svg_conform_reqs[req] || 0
    svgcheck_count = svgcheck_reqs[req] || 0

    coverage[req] = {
      svg_conform: svg_count,
      svgcheck: svgcheck_count,
      exact_match: svg_count == svgcheck_count,
      coverage_ratio: if svgcheck_count.positive?
                        svg_count.to_f / svgcheck_count
                      else
                        (svg_count.positive? ? Float::INFINITY : 1.0)
                      end,
    }
  end

  coverage
end

.compare_semantic_issues(svg_conform_issues, svgcheck_issues, repair_mode = false, _mixed_mode = false) ⇒ Object

Compare semantic issues



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# File 'lib/svg_conform/semantic_comparator.rb', line 319

def self.compare_semantic_issues(svg_conform_issues, svgcheck_issues,
repair_mode = false, _mixed_mode = false)
  all_semantic_keys = (svg_conform_issues.keys + svgcheck_issues.keys).uniq

  comparison = {}
  all_semantic_keys.each do |key|
    svg_count = svg_conform_issues[key] || 0
    svgcheck_count = svgcheck_issues[key] || 0

    # In repair mode, treat informational messages differently
    # Check if this is a repair notification by looking at the semantic key pattern
    is_repair_notification = repair_mode && (
      key.start_with?("style_promotion:", "informative:") ||
      key.include?("replaced with") ||
      key.start_with?("invalid_attribute_value:") # These are repair notifications in repair mode
    )

    comparison[key] = if is_repair_notification
                        # Repair notifications are informational, not validation errors
                        {
                          svg_conform: svg_count,
                          svgcheck: svgcheck_count,
                          semantic_match: true, # Always consider repair notifications as matching
                          coverage: true,
                          repair_notification: true,
                        }
                      else
                        {
                          svg_conform: svg_count,
                          svgcheck: svgcheck_count,
                          semantic_match: svg_count == svgcheck_count,
                          coverage: svgcheck_count.positive? ? (svg_count >= svgcheck_count) : svg_count.zero?,
                          repair_notification: false,
                        }
                      end
  end

  comparison
end

.compare_structure(struct1, struct2) ⇒ Object

Compare structure



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# File 'lib/svg_conform/semantic_comparator.rb', line 664

def self.compare_structure(struct1, struct2)
  {
    elements_match: struct1[:elements] == struct2[:elements],
    hierarchy_match: compare_hierarchy(struct1[:hierarchy],
                                       struct2[:hierarchy]),
    element_count_match: struct1[:element_count] == struct2[:element_count],
  }
end

.compare_style_semantics(styles1, styles2) ⇒ Object

Compare style semantics



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# File 'lib/svg_conform/semantic_comparator.rb', line 740

def self.compare_style_semantics(styles1, styles2)
  # Flatten and normalize all styles
  flat1 = styles1.flat_map(&:to_a).to_h
  flat2 = styles2.flat_map(&:to_a).to_h

  # Compare normalized styles
  flat1 == flat2
end

.compare_styles(styles1, styles2) ⇒ Object

Compare styles



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# File 'lib/svg_conform/semantic_comparator.rb', line 722

def self.compare_styles(styles1, styles2)
  all_elements = (styles1.keys + styles2.keys).uniq

  element_comparisons = {}
  all_elements.each do |element|
    elem_styles1 = styles1[element] || []
    elem_styles2 = styles2[element] || []

    element_comparisons[element] = {
      count_match: elem_styles1.length == elem_styles2.length,
      semantic_match: compare_style_semantics(elem_styles1, elem_styles2),
    }
  end

  element_comparisons
end

.compare_validation_results(svg_conform_report, svgcheck_report) ⇒ Object

Compare validation results semantically



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# File 'lib/svg_conform/semantic_comparator.rb', line 9

def self.compare_validation_results(svg_conform_report, svgcheck_report)
  # Extract semantic features from both reports
  svg_conform_features = extract_validation_features(svg_conform_report)
  svgcheck_features = extract_validation_features(svgcheck_report)

  # Detect repair mode (both tools report valid=true)
  repair_mode = svg_conform_features[:valid] && svgcheck_features[:valid]

  # Detect mixed mode (one valid, one invalid)
  mixed_mode = svg_conform_features[:valid] != svgcheck_features[:valid]

  # Compare features semantically
  comparison = {
    overall_validity: compare_validity(svg_conform_features[:valid],
                                       svgcheck_features[:valid]),
    requirement_coverage: compare_requirement_coverage(svg_conform_features[:requirements],
                                                       svgcheck_features[:requirements]),
    semantic_issues: compare_semantic_issues(svg_conform_features[:issues], svgcheck_features[:issues],
                                             repair_mode, mixed_mode),
    detailed_mapping: create_detailed_mapping(svg_conform_features[:issues], svgcheck_features[:issues],
                                              repair_mode, mixed_mode),
    repair_mode: repair_mode,
    mixed_mode: mixed_mode,
  }

  # Add validity_match for compatibility
  comparison[:validity_match] = comparison[:overall_validity][:match]

  # Calculate overall compatibility score
  comparison[:compatibility_score] =
    calculate_compatibility_score(comparison)
  comparison
end

.compare_validity(svg_conform_valid, svgcheck_valid) ⇒ Object

Compare validity semantically



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# File 'lib/svg_conform/semantic_comparator.rb', line 285

def self.compare_validity(svg_conform_valid, svgcheck_valid)
  {
    svg_conform: svg_conform_valid,
    svgcheck: svgcheck_valid,
    match: svg_conform_valid == svgcheck_valid,
    semantic_match: true, # Validity is always semantic
  }
end

.create_detailed_mapping(svg_conform_issues, svgcheck_issues, repair_mode = false, _mixed_mode = false) ⇒ Object

Create detailed mapping between issues



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# File 'lib/svg_conform/semantic_comparator.rb', line 360

def self.create_detailed_mapping(svg_conform_issues, svgcheck_issues,
repair_mode = false, _mixed_mode = false)
  # In repair mode, separate validation issues from repair notifications
  if repair_mode
    svg_conform_validation = svg_conform_issues.reject do |k, _|
      k.start_with?("style_promotion:", "informative:",
                    "invalid_attribute_value:")
    end
    svgcheck_validation = svgcheck_issues.reject do |k, _|
      k.start_with?("style_promotion:",
                    "informative:") || k.include?("replaced with") || k.start_with?("invalid_attribute_value:")
    end

    svg_conform_notifications = svg_conform_issues.select do |k, _|
      k.start_with?("style_promotion:", "informative:",
                    "invalid_attribute_value:")
    end
    svgcheck_notifications = svgcheck_issues.select do |k, _|
      k.start_with?("style_promotion:",
                    "informative:") || k.include?("replaced with") || k.start_with?("invalid_attribute_value:")
    end

    {
      svg_conform_only: svg_conform_validation.keys - svgcheck_validation.keys,
      svgcheck_only: svgcheck_validation.keys - svg_conform_validation.keys,
      common: svg_conform_validation.keys & svgcheck_validation.keys,
      total_svg_conform: svg_conform_validation.values.sum,
      total_svgcheck: svgcheck_validation.values.sum,
      repair_notifications: {
        svg_conform: svg_conform_notifications.values.sum,
        svgcheck: svgcheck_notifications.values.sum,
      },
    }
  else
    {
      svg_conform_only: svg_conform_issues.keys - svgcheck_issues.keys,
      svgcheck_only: svgcheck_issues.keys - svg_conform_issues.keys,
      common: svg_conform_issues.keys & svgcheck_issues.keys,
      total_svg_conform: svg_conform_issues.values.sum,
      total_svgcheck: svgcheck_issues.values.sum,
    }
  end
end

.extract_attributes(doc) ⇒ Object

Extract attributes



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# File 'lib/svg_conform/semantic_comparator.rb', line 597

def self.extract_attributes(doc)
  attributes = {}

  doc.xpath("//*").each do |element|
    element.attributes.each do |name, attr|
      key = "#{element.name}@#{name}"
      attributes[key] ||= []
      attributes[key] << normalize_attribute_value(attr.value)
    end
  end

  attributes.transform_values(&:uniq)
end

.extract_content(doc) ⇒ Object

Extract text content



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# File 'lib/svg_conform/semantic_comparator.rb', line 612

def self.extract_content(doc)
  {
    text_nodes: doc.xpath("//text()").map(&:content).reject(&:empty?),
    cdata_sections: doc.xpath("//comment()").map(&:content),
  }
end

.extract_hierarchy(element, depth = 0) ⇒ Object

Extract element hierarchy



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# File 'lib/svg_conform/semantic_comparator.rb', line 585

def self.extract_hierarchy(element, depth = 0)
  return nil if depth > 10 # Prevent infinite recursion

  {
    name: element.name,
    children: element.children.select(&:element?).map do |child|
      extract_hierarchy(child, depth + 1)
    end,
  }
end

.extract_namespaces(doc) ⇒ Object

Extract namespaces



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# File 'lib/svg_conform/semantic_comparator.rb', line 620

def self.extract_namespaces(doc)
  namespaces = {}

  doc.xpath("//*").each do |element|
    element.namespace_definitions.each do |ns|
      namespaces[ns.prefix || "default"] = ns.href
    end
  end

  namespaces
end

.extract_requirement_types(issues) ⇒ Object

Extract requirement types from issues



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# File 'lib/svg_conform/semantic_comparator.rb', line 94

def self.extract_requirement_types(issues)
  requirement_counts = {}

  issues.each do |issue|
    req_id = issue.respond_to?(:requirement_id) ? issue.requirement_id : "unknown"
    requirement_counts[req_id] = (requirement_counts[req_id] || 0) + 1
  end

  requirement_counts
end

.extract_semantic_key(issue) ⇒ Object

Extract semantic key from an issue



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# File 'lib/svg_conform/semantic_comparator.rb', line 119

def self.extract_semantic_key(issue)
  # Handle different issue types
  message = if issue.respond_to?(:message)
              issue.message
            elsif issue.is_a?(Hash)
              issue[:message] || issue["message"]
            else
              issue.to_s
            end

  # SECURITY: Prevent ReDoS attacks by limiting message length
  # GitHub CodeQL: Regular expressions with excessive backtracking can cause DoS
  # This affects svgcheck comparison commands (development use only)
  # Note: Ruby 3.2+ has built-in regex caching that prevents ReDoS
  if message.length > 1000
    # Truncate very long messages to prevent exponential backtracking
    message = "#{message[0, 997]}..."
  end

  # Map ONLY the exact 28 svgcheck.py log patterns to semantic keys
  # SECURITY: Regex patterns use quantifier limits to prevent ReDoS
  case message
  # Error patterns from checksvg.py (4 patterns)
  when /\AMalformed field '([^']{1,200})' in style attribute found\. Field removed\.\z/
    "malformed_style_field:#{normalize_value(::Regexp.last_match(1))}"
  when /\AMalformed field '(\[[^\]]{1,200}\])' in style attribute found\. Field removed\.\z/
    "malformed_style_field:#{normalize_value(::Regexp.last_match(1))}"
  when /\AMalformed style declaration '([^']{1,200})' found\. Declaration removed\.\z/
    "malformed_style_field:#{normalize_value(::Regexp.last_match(1))}"
  when /\AStyle property '([^']{1,100})' promoted to attribute\z/
    "style_promotion:#{::Regexp.last_match(1)}"
  when /\AStyle property '([^']{1,100})' removed\z/
    "style_property_removed:#{::Regexp.last_match(1)}"
  when /\AError when calculating SVG size: (.{1,500})\z/
    "informative:svg_size_calculation_error"
  when /\AFile does not conform to SVG requirements\z/
    "informative:file_nonconformant"

  # Warning patterns from checksvg.py (10 patterns)
  when /\AElement '([^']{1,100})' in namespace '([^']{1,200})' is not allowed\z/
    "invalid_element_namespace:#{::Regexp.last_match(1)}:#{normalize_namespace(::Regexp.last_match(2))}"
  when /\AElement '([^']{1,100})' not allowed\z/
    "invalid_element:#{::Regexp.last_match(1)}"
  when /\AElement '([^']{1,100})' does not allow attributes with namespace '([^']{1,200})'\z/
    "namespace_violation:#{::Regexp.last_match(1)}:#{normalize_namespace(::Regexp.last_match(2))}"
  when /\AThe element '([^']{1,100})' does not allow the attribute '([^']{1,100})', attribute to be removed\.\z/
    "invalid_attribute:#{::Regexp.last_match(1)}:#{::Regexp.last_match(2)}"
  when /\AThe attribute '([^']{1,100})' does not allow the value '([^']{1,200})', replaced with '([^']{1,200})'\z/
    # Normalize color values for semantic equivalence
    attribute = ::Regexp.last_match(1)
    value = ::Regexp.last_match(2)

    # For color attributes, use normalized color values
    if %w[fill stroke].include?(attribute)
      "invalid_attribute_value:#{attribute}:#{normalize_color_value(value)}"
    else
      "invalid_attribute_value:#{attribute}:#{normalize_value(value)}"
    end
  when /\AThe attribute '([^']{1,100})' does not allow the value '([^']{1,200})', attribute to be removed\z/
    "invalid_attribute_value:#{::Regexp.last_match(1)}:#{normalize_value(::Regexp.last_match(2))}"
  when /\AThe attribute viewBox is required on the root svg element\z/
    "viewbox_required"
  when /\ATrying to put in the attribute with value '([^']{1,200})'\z/
    "informative:viewbox_auto_added"
  when /\AThe namespace ([^\s]{1,200}) is not permitted for svg elements\.\z/
    "namespace_violation:element:#{normalize_namespace(::Regexp.last_match(1))}"
  when /\AThe element '([^']{1,100})' is not allowed as a child of '([^']{1,100})'\z/
    "invalid_child:#{::Regexp.last_match(1)}:#{::Regexp.last_match(2)}"
  when /\AMalformed namespace\. Should have errored during parsing\z/
    "informative:malformed_namespace"
  when /\A--no-xinclude option is deprecated and has no effect\.\z/
    "informative:deprecated_option"

  # Note patterns from checksvg.py (13 patterns)
  when /\Amodify_style check '([^']{1,100})' in '([^']{1,100})'\z/
    "informative:modify_style_check"
  when /\A   modify_style - p=([^\s]{1,100})  v=(.{1,200})\z/
    "informative:modify_style_processing"
  when /\Avalue_ok look for (.{1,200}) in (.{1,200})\z/
    "informative:value_validation"
  when /\A  legal value list (.{1,500})\z/
    "informative:legal_values"
  when /\A --- skip to end -- (.{1,200})\z/
    "informative:validation_skip"
  when /\AColor or grayscale heuristic applied to: '([^']{1,100})' yields shade: '([^']{1,100})'\z/
    "informative:color_heuristic"
  when /\A[^\s]{1,50} tag = (.{1,200})\z/
    "informative:element_processing"
  when /\A[^\s]{1,50} element [^:]{1,50}: (.{1,200})\z/
    "informative:element_attributes"
  when /\A[^\s]{1,50} attr ([^\s]{1,100}) = ([^\s]{1,200}) \(ns = ([^)]{0,200})\)\z/
    "informative:attribute_processing"
  when /\A[^\s]{1,50}child, tag = (.{1,200})\z/
    "informative:child_processing"
  when /\AChecking svg element at line (\d{1,10}) in file (.{1,500})\z/
    "informative:svg_element_check"

  # SvgConform-specific patterns that map to svgcheck semantic equivalents
  when /\AColor '([^']{1,100})' in attribute '([^']{1,100})' is not allowed in this profile\z/
    # Map SvgConform color restriction to svgcheck invalid_attribute_value pattern
    # Normalize color values to handle different formats (WHITE -> white, etc.)
    "invalid_attribute_value:#{::Regexp.last_match(2)}:#{normalize_color_value(::Regexp.last_match(1))}"
  when /\AColor '([^']{1,100})' in style property '([^']{1,100})' is not allowed in this profile\z/
    # Map SvgConform style property color restriction to svgcheck invalid_attribute_value pattern
    # Svgcheck promotes style properties to attributes, so we map accordingly
    "invalid_attribute_value:#{::Regexp.last_match(2)}:#{normalize_color_value(::Regexp.last_match(1))}"
  when /\AFont family '([^']{1,200})' is not allowed in this profile\z/
    # Map SvgConform font family restriction to svgcheck invalid_attribute_value pattern
    "invalid_attribute_value:font-family:#{normalize_value(::Regexp.last_match(1))}"
  when /\AFont family '([^']{1,200})' in style is not allowed in this profile\z/
    # Map SvgConform style font family restriction to svgcheck invalid_attribute_value pattern
    font_family = normalize_value(::Regexp.last_match(1))
    # Embedded font restrictions are profile differences
    if font_family.include?("embedded")
      "informative:profile_stricter_embedded_fonts:#{font_family}"
    else
      "invalid_attribute_value:font-family:#{font_family}"
    end
  when /\AFont family '([^']{1,200})' is not allowed in this profile\z/
    # Map SvgConform font family restriction to svgcheck invalid_attribute_value pattern
    font_family = normalize_value(::Regexp.last_match(1))
    # Embedded font restrictions are profile differences
    if font_family.include?("embedded")
      "informative:profile_stricter_embedded_fonts:#{font_family}"
    else
      "invalid_attribute_value:font-family:#{font_family}"
    end
  when /\Asvg root element must have a viewbox attribute\z/i
    # Map SvgConform viewBox requirement to svgcheck pattern (case insensitive)
    "viewbox_required"
  when /\AElement '([^']{1,100})' is not allowed in this profile\z/
    # Map SvgConform element restriction to svgcheck invalid_child pattern
    element = ::Regexp.last_match(1)
    # Font-related and clipPath elements are profile differences, not validation errors
    if %w[font glyph font-face missing-glyph clipPath].include?(element)
      "informative:profile_stricter_elements:#{element}"
    else
      "invalid_child:#{element}:svg"
    end
  when /\AThe element '([^']{1,100})' is not allowed as a child of '([^']{1,100})'\z/
    # Map SvgConform child element restriction to svgcheck pattern
    element = ::Regexp.last_match(1)
    parent = ::Regexp.last_match(2)
    # Font-related and clipPath elements as children are profile differences
    if %w[font glyph font-face missing-glyph clipPath].include?(element)
      "informative:profile_stricter_elements:#{element}:#{parent}"
    else
      "invalid_child:#{element}:#{parent}"
    end
  when /\AAttribute '([^']{1,100})' is not allowed on element '([^']{1,100})'\z/
    # Map SvgConform attribute restriction to svgcheck pattern
    "invalid_attribute:#{::Regexp.last_match(2)}:#{::Regexp.last_match(1)}"
  when /\AThe namespace ([^\s]{1,200}) is not permitted for svg elements\.?\z/
    # Map SvgConform namespace restriction to svgcheck pattern
    "namespace_violation:element:#{normalize_namespace(::Regexp.last_match(1))}"
  when /\AviewBox attribute must contain four numeric values/i
    # Map SvgConform viewBox format validation (more strict than svgcheck)
    "viewbox_format_error"

  # Everything else maps to "other" for non-svgcheck messages
  else
    "other:#{normalize_message(message)}"
  end
end

.extract_structure(doc) ⇒ Object

Extract document structure



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# File 'lib/svg_conform/semantic_comparator.rb', line 573

def self.extract_structure(doc)
  elements = doc.xpath("//*").map(&:name).uniq.sort
  hierarchy = extract_hierarchy(doc.root) if doc.root

  {
    elements: elements,
    hierarchy: hierarchy,
    element_count: doc.xpath("//*").length,
  }
end

.extract_styles(doc) ⇒ Object

Extract style information



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# File 'lib/svg_conform/semantic_comparator.rb', line 633

def self.extract_styles(doc)
  styles = {}

  doc.xpath("//*[@style]").each do |element|
    style_attr = element["style"]
    parsed_styles = parse_style_attribute(style_attr)
    styles[element.name] ||= []
    styles[element.name] << parsed_styles
  end

  styles
end

.extract_svg_features(doc) ⇒ Object

Extract SVG features for semantic comparison



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# File 'lib/svg_conform/semantic_comparator.rb', line 562

def self.extract_svg_features(doc)
  {
    structure: extract_structure(doc),
    attributes: extract_attributes(doc),
    content: extract_content(doc),
    namespaces: extract_namespaces(doc),
    styles: extract_styles(doc),
  }
end

.extract_validation_features(report) ⇒ Object

Extract validation features for semantic comparison



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# File 'lib/svg_conform/semantic_comparator.rb', line 74

def self.extract_validation_features(report)
  # Extract ALL issues (errors, warnings, infos) for semantic comparison
  issues = []

  issues.concat(report.errors.issues) if report.respond_to?(:errors) && report.errors.respond_to?(:issues)

  # For svgcheck reports, also include warnings and infos if available
  issues.concat(report.warnings.issues) if report.respond_to?(:warnings) && report.warnings.respond_to?(:issues)

  # If the report has a direct issues method, use that
  issues = report.issues if issues.empty? && report.respond_to?(:issues)

  {
    valid: report.respond_to?(:valid) ? report.valid : false,
    requirements: extract_requirement_types(issues),
    issues: group_issues_semantically(issues),
  }
end

.group_issues_semantically(issues) ⇒ Object

Group issues by semantic meaning



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# File 'lib/svg_conform/semantic_comparator.rb', line 106

def self.group_issues_semantically(issues)
  semantic_groups = {}

  issues.each do |issue|
    semantic_key = extract_semantic_key(issue)
    semantic_groups[semantic_key] ||= []
    semantic_groups[semantic_key] << issue
  end

  semantic_groups.transform_values(&:length)
end

.normalize_attribute_value(value) ⇒ Object 



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# File 'lib/svg_conform/semantic_comparator.rb', line 819

def self.normalize_attribute_value(value)
  # Normalize attribute values for comparison
  value.strip.downcase
end

.normalize_color_value(color) ⇒ Object 



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# File 'lib/svg_conform/semantic_comparator.rb', line 783

def self.normalize_color_value(color)
  # Normalize color values to handle different formats
  normalized = color.downcase.strip

  # Map common color equivalents
  case normalized
  when "white", "#fff", "#ffffff", "rgb(255,255,255)", "rgb(255, 255, 255)", "rgb(100%,100%,100%)", "rgb(100%, 100%, 100%)"
    "white"
  when "black", "#000", "#000000", "rgb(0,0,0)", "rgb(0, 0, 0)", "rgb(0%,0%,0%)", "rgb(0%, 0%, 0%)"
    "black"
  when "red", "#f00", "#ff0000", "rgb(255,0,0)", "rgb(255, 0, 0)", "rgb(100%,0%,0%)", "rgb(100%, 0%, 0%)"
    "red"
  when "green", "#0f0", "#00ff00", "rgb(0,255,0)", "rgb(0, 255, 0)", "rgb(0%,100%,0%)", "rgb(0%, 100%, 0%)"
    "green"
  when "blue", "#00f", "#0000ff", "rgb(0,0,255)", "rgb(0, 0, 255)", "rgb(0%,0%,100%)", "rgb(0%, 0%, 100%)"
    "blue"
  when "grey", "gray"
    "grey"
  else
    # For hex colors, normalize to lowercase without spaces
    if /\A#[0-9a-f]{3,8}\z/i.match?(normalized)
      normalized.downcase
    elsif /\Argb\s*\(/i.match?(normalized)
      # Normalize RGB format by removing spaces
      normalized.gsub(/\s+/, "")
    else
      normalized
    end
  end
end

.normalize_message(message) ⇒ Object 



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# File 'lib/svg_conform/semantic_comparator.rb', line 814

def self.normalize_message(message)
  # Extract key semantic components from message
  message.downcase.gsub(/['":]/, "").strip
end

.normalize_namespace(namespace) ⇒ Object

Utility methods for normalization



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# File 'lib/svg_conform/semantic_comparator.rb', line 760

def self.normalize_namespace(namespace)
  case namespace
  when /inkscape/i
    "inkscape"
  when /sodipodi/i
    "sodipodi"
  when /w3\.org.*svg/i
    "svg"
  else
    namespace
  end
end

.normalize_style_value(value) ⇒ Object 



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# File 'lib/svg_conform/semantic_comparator.rb', line 824

def self.normalize_style_value(value)
  # Normalize style values for comparison
  value.strip.downcase
end

.normalize_value(value) ⇒ Object 



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# File 'lib/svg_conform/semantic_comparator.rb', line 773

def self.normalize_value(value)
  # Normalize common values for semantic comparison
  normalized = value.downcase.strip

  # Handle array-like values from svgcheck (e.g., "['malformed']" -> "malformed")
  normalized = ::Regexp.last_match(1) if normalized =~ /\A\['([^']{1,200})'\]\z/

  normalized
end

.parse_style_attribute(style_str) ⇒ Object

Parse style attribute



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# File 'lib/svg_conform/semantic_comparator.rb', line 647

def self.parse_style_attribute(style_str)
  return {} if style_str.nil? || style_str.strip.empty?

  styles = {}
  style_str.split(";").each do |declaration|
    next if declaration.strip.empty?

    property, value = declaration.split(":", 2)
    next unless property && value

    styles[property.strip] = normalize_style_value(value.strip)
  end

  styles
end

.parse_svg_safely(content) ⇒ Object

Parse SVG safely



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# File 'lib/svg_conform/semantic_comparator.rb', line 553

def self.parse_svg_safely(content)
  return nil if content.nil? || content.strip.empty?

  Nokogiri::XML(content, &:strict)
rescue Nokogiri::XML::SyntaxError
  nil
end