Class: CssCompressor::Compressor

Inherits:
Object
  • Object
show all
Defined in:
lib/cssminify2/cssmin_enhanced.rb

Overview

Enhanced CSS Compressor with modular architecture

Constant Summary collapse

PATTERNS =

Regex patterns used throughout compression

{
  comment_start: /\/\*/,
  comment_end: /\*\//,
  string_double: /"([^\\"]|\\.|\\)*"/,
  string_single: /'([^\\']|\\.|\\)*'/,
  data_url: /url\(\s*(['"]?)data\:/i,
  rgb_function: /rgb\s*\(\s*([0-9,\s]+)\s*\)(\d+%)?/i,
  hex_6digit: /(\\=\\s*?[\\\"']?)?#([0-9a-f])([0-9a-f])([0-9a-f])([0-9a-f])([0-9a-f])([0-9a-f])(:?\\}|[^0-9a-f{][^{]*?\\})/i,
  calc_function: /calc\([^)]*\)/,
  pseudo_class_chain: /(:[\\w-]+(?:\\([^)]*\\))?(?:\\s+:[\\w-]+(?:\\([^)]*\\))?)+)/,
  filter_property: /filter\s*:[^;}]+/i,
  zero_units: /(?i)(^|: ?)((?:[0-9a-z\-\.]+ )*?)?(?:0?\.)?0(?:px|em|%|in|cm|mm|pc|pt|ex|deg|g?rad|m?s|k?hz)/i,
  multiple_semicolons: /;;+/,
  whitespace: /\s+/
}.freeze
COLOR_KEYWORDS =

Color optimization mappings

{
  '#ff0000' => 'red',     '#f00' => 'red',
  '#000080' => 'navy',    '#008000' => 'green',  
  '#008080' => 'teal',    '#800000' => 'maroon',
  '#800080' => 'purple',  '#808000' => 'olive',
  '#808080' => 'gray',    '#c0c0c0' => 'silver',
  '#ffa500' => 'orange',  '#0000ff' => 'blue',
  '#00ff00' => 'lime',    '#ff00ff' => 'fuchsia',
  '#00ffff' => 'cyan',    '#ffff00' => 'yellow',
  '#000000' => 'black',   '#ffffff' => 'white'
}.freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(config = Configuration.new) ⇒ Compressor

Returns a new instance of Compressor.



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# File 'lib/cssminify2/cssmin_enhanced.rb', line 67

def initialize(config = Configuration.new)
  @config = config
  @preserved_tokens = []
  @stats = { original_size: 0, compressed_size: 0, compression_ratio: 0.0 }
end

Instance Attribute Details

#config ⇒ Object (readonly)

Returns the value of attribute config.



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# File 'lib/cssminify2/cssmin_enhanced.rb', line 65

def config
  @config
end

#stats ⇒ Object (readonly)

Returns the value of attribute stats.



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# File 'lib/cssminify2/cssmin_enhanced.rb', line 65

def stats
  @stats
end

Instance Method Details

#compress(css, options = {}) ⇒ Object 



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# File 'lib/cssminify2/cssmin_enhanced.rb', line 73

def compress(css, options = {})
  @stats[:original_size] = css.length
  
  begin
    # Input normalization
    css = normalize_input(css)
    
    # Core compression pipeline
    css = extract_data_urls(css) if css.include?('data:')
    css = process_comments(css)
    css = preserve_strings(css)
    css = normalize_whitespace(css)
    css = preserve_calc_functions(css)
    css = optimize_selectors(css)
    css = optimize_properties(css)
    css = optimize_colors(css) if @config.optimize_colors
    css = optimize_values(css)
    css = finalize_compression(css)
    
    @stats[:compressed_size] = css.length
    @stats[:compression_ratio] = (@stats[:original_size] - @stats[:compressed_size]).to_f / @stats[:original_size] * 100
    
    css
    
  rescue => e
    if @config.strict_mode
      raise CompressError.new("CSS compression failed: #{e.message}", e)
    else
      # Fallback to basic compression
      css.gsub(PATTERNS[:whitespace], ' ').strip
    end
  end
end