Class: HtmlCompressor::Compressor

Inherits:
Object
  • Object
show all
Defined in:
lib/htmlcompressor/compressor.rb

Constant Summary collapse

JS_COMPRESSOR_YUI = 
"yui"
JS_COMPRESSOR_CLOSURE = 
"closure"
PHP_TAG_PATTERN =

Predefined pattern that matches <?php ... ?> tags. Could be passed inside a list to #setPreservePatterns(List) setPreservePatterns method.

/<\?php.*?\?>/im
SERVER_SCRIPT_TAG_PATTERN =

Predefined pattern that matches &lt;% ... %> tags. Could be passed inside a list to #setPreservePatterns(List) setPreservePatterns method.

/<%.*?%>/m
SERVER_SIDE_INCLUDE_PATTERN =

Predefined pattern that matches &lt;--# ... --> tags. Could be passed inside a list to #setPreservePatterns(List) setPreservePatterns method.

/<!--\s*#.*?-->/m
BLOCK_TAGS_MIN =

Predefined list of tags that are very likely to be block-level. Could be passed to #setRemoveSurroundingSpaces(String) setRemoveSurroundingSpaces method.

"html,head,body,br,p"
BLOCK_TAGS_MAX =

Predefined list of tags that are block-level by default, excluding &lt;div> and &lt;li> tags. Table tags are also included. Could be passed to #setRemoveSurroundingSpaces(String) setRemoveSurroundingSpaces method.

BLOCK_TAGS_MIN + ",h1,h2,h3,h4,h5,h6,blockquote,center,dl,fieldset,form,frame,frameset,hr,noframes,ol,table,tbody,tr,td,th,tfoot,thead,ul"
ALL_TAGS =

Could be passed to #setRemoveSurroundingSpaces(String) setRemoveSurroundingSpaces method to remove all surrounding spaces (not recommended).

"all"
TEMP_COND_COMMENT_BLOCK =

temp replacements for preserved blocks

"%%%~COMPRESS~COND~{0,number,#}~%%%"
TEMP_PRE_BLOCK = 
"%%%~COMPRESS~PRE~{0,number,#}~%%%"
TEMP_TEXT_AREA_BLOCK = 
"%%%~COMPRESS~TEXTAREA~{0,number,#}~%%%"
TEMP_SCRIPT_BLOCK = 
"%%%~COMPRESS~SCRIPT~{0,number,#}~%%%"
TEMP_STYLE_BLOCK = 
"%%%~COMPRESS~STYLE~{0,number,#}~%%%"
TEMP_EVENT_BLOCK = 
"%%%~COMPRESS~EVENT~{0,number,#}~%%%"
TEMP_LINE_BREAK_BLOCK = 
"%%%~COMPRESS~LT~{0,number,#}~%%%"
TEMP_SKIP_BLOCK = 
"%%%~COMPRESS~SKIP~{0,number,#}~%%%"
TEMP_USER_BLOCK = 
"%%%~COMPRESS~USER{0,number,#}~{1,number,#}~%%%"
EMPTY_PATTERN =

compiled regex patterns

Regexp.new("\\s")
SKIP_PATTERN = 
Regexp.new("<!--\\s*\\{\\{\\{\\s*-->(.*?)<!--\\s*\\}\\}\\}\\s*-->", Regexp::MULTILINE | Regexp::IGNORECASE)
COND_COMMENT_PATTERN = 
Regexp.new("(<!(?:--)?\\[[^\\]]+?\\]>)(.*?)(<!\\[[^\\]]+\\]-->)", Regexp::MULTILINE | Regexp::IGNORECASE)
COMMENT_PATTERN = 
Regexp.new("<!---->|<!--[^\\[].*?-->", Regexp::MULTILINE | Regexp::IGNORECASE)
INTERTAG_PATTERN_TAG_TAG = 
Regexp.new(">\\s+<", Regexp::MULTILINE | Regexp::IGNORECASE)
INTERTAG_PATTERN_TAG_CUSTOM = 
Regexp.new(">\\s+%%%~", Regexp::MULTILINE | Regexp::IGNORECASE)
INTERTAG_PATTERN_CUSTOM_TAG = 
Regexp.new("~%%%\\s+<", Regexp::MULTILINE | Regexp::IGNORECASE)
INTERTAG_PATTERN_CUSTOM_CUSTOM = 
Regexp.new("~%%%\\s+%%%~", Regexp::MULTILINE | Regexp::IGNORECASE)
MULTISPACE_PATTERN = 
Regexp.new("\\s+", Regexp::MULTILINE | Regexp::IGNORECASE)
TAG_END_SPACE_PATTERN = 
Regexp.new("(<(?:[^>]+?))(?:\\s+?)(/?>)", Regexp::MULTILINE | Regexp::IGNORECASE)
TAG_LAST_UNQUOTED_VALUE_PATTERN = 
Regexp.new("=\\s*[a-z0-9\\-_]+$", Regexp::IGNORECASE)
TAG_QUOTE_PATTERN = 
Regexp.new("\\s*=\\s*([\"'])([a-z0-9\\-_]+?)\\1(/?)(?=[^<]*?>)", Regexp::IGNORECASE)
PRE_PATTERN = 
Regexp.new("(<pre[^>]*?>)(.*?)(</pre>)", Regexp::MULTILINE | Regexp::IGNORECASE)
TA_PATTERN = 
Regexp.new("(<textarea[^>]*?>)(.*?)(</textarea>)", Regexp::MULTILINE | Regexp::IGNORECASE)
SCRIPT_PATTERN = 
Regexp.new("(<script[^>]*?>)(.*?)(</script>)", Regexp::MULTILINE | Regexp::IGNORECASE)
STYLE_PATTERN = 
Regexp.new("(<style[^>]*?>)(.*?)(</style>)", Regexp::MULTILINE | Regexp::IGNORECASE)
TAG_PROPERTY_PATTERN = 
Regexp.new("(\\s\\w+)\\s*=\\s*(?=[^<]*?>)", Regexp::IGNORECASE)
CDATA_PATTERN = 
Regexp.new("\\s*<!\\[CDATA\\[(.*?)\\]\\]>\\s*", Regexp::MULTILINE | Regexp::IGNORECASE)
DOCTYPE_PATTERN = 
Regexp.new("<!DOCTYPE[^>]*>", Regexp::MULTILINE | Regexp::IGNORECASE)
TYPE_ATTR_PATTERN = 
Regexp.new("type\\s*=\\s*([\\\"']*)(.+?)\\1", Regexp::MULTILINE | Regexp::IGNORECASE)
JS_TYPE_ATTR_PATTERN = 
Regexp.new("(<script[^>]*)type\\s*=\\s*([\"']*)(?:text|application)\/javascript\\2([^>]*>)", Regexp::MULTILINE | Regexp::IGNORECASE)
JS_LANG_ATTR_PATTERN = 
Regexp.new("(<script[^>]*)language\\s*=\\s*([\"']*)javascript\\2([^>]*>)", Regexp::MULTILINE | Regexp::IGNORECASE)
STYLE_TYPE_ATTR_PATTERN = 
Regexp.new("(<style[^>]*)type\\s*=\\s*([\"']*)text/(?:style|css)\\2([^>]*>)", Regexp::MULTILINE | Regexp::IGNORECASE)
Regexp.new("(<link[^>]*)type\\s*=\\s*([\"']*)text/(?:css|plain)\\2([^>]*>)", Regexp::MULTILINE | Regexp::IGNORECASE)
Regexp.new("<link(?:[^>]*)rel\\s*=\\s*([\"']*)(?:alternate\\s+)?stylesheet\\1(?:[^>]*)>", Regexp::MULTILINE | Regexp::IGNORECASE)
FORM_METHOD_ATTR_PATTERN = 
Regexp.new("(<form[^>]*)method\\s*=\\s*([\"']*)get\\2([^>]*>)", Regexp::MULTILINE | Regexp::IGNORECASE)
INPUT_TYPE_ATTR_PATTERN = 
Regexp.new("(<input[^>]*)type\\s*=\\s*([\"']*)text\\2([^>]*>)", Regexp::MULTILINE | Regexp::IGNORECASE)
BOOLEAN_ATTR_PATTERN = 
Regexp.new("(<\\w+[^>]*[\"' ])(checked|selected|disabled|readonly)\\s*=\\s*([\"']*)\\w*\\3([^>]*>)", Regexp::MULTILINE | Regexp::IGNORECASE)
EVENT_JS_PROTOCOL_PATTERN = 
Regexp.new("^javascript:\\s*(.+)", Regexp::MULTILINE | Regexp::IGNORECASE)
HTTP_PROTOCOL_PATTERN = 
Regexp.new("(<[^>]+?(?:href|src|cite|action)\\s*=\\s*['\"])http:(//[^>]+?>)", Regexp::MULTILINE | Regexp::IGNORECASE)
HTTPS_PROTOCOL_PATTERN = 
Regexp.new("(<[^>]+?(?:href|src|cite|action)\\s*=\\s*['\"])https:(//[^>]+?>)", Regexp::MULTILINE | Regexp::IGNORECASE)
REL_EXTERNAL_PATTERN = 
Regexp.new("<(?:[^>]*)rel\\s*=\\s*([\"']*)(?:alternate\\s+)?external\\1(?:[^>]*)>", Regexp::MULTILINE | Regexp::IGNORECASE)
EVENT_PATTERN1 =

unmasked: son+s*=s*“*(?:\.[^”\rn]*)*“”

Regexp.new("(\\son[a-z]+\\s*=\\s*\")([^\"\\\\\\r\\n]*(?:\\\\.[^\"\\\\\\r\\n]*)*)(\")", Regexp::IGNORECASE)
EVENT_PATTERN2 = 
Regexp.new("(\\son[a-z]+\\s*=\\s*')([^'\\\\\\r\\n]*(?:\\\\.[^'\\\\\\r\\n]*)*)(')", Regexp::IGNORECASE)
LINE_BREAK_PATTERN = 
Regexp.new("(?:[[:blank:]]*(\\r?\\n)[[:blank:]]*)+")
SURROUNDING_SPACES_MIN_PATTERN = 
Regexp.new("\\s*(</?(?:" + BLOCK_TAGS_MIN.gsub(",", "|") + ")(?:>|[\\s/][^>]*>))\\s*", Regexp::MULTILINE | Regexp::IGNORECASE)
SURROUNDING_SPACES_MAX_PATTERN = 
Regexp.new("\\s*(</?(?:" + BLOCK_TAGS_MAX.gsub(",", "|") + ")(?:>|[\\s/][^>]*>))\\s*", Regexp::MULTILINE | Regexp::IGNORECASE)
SURROUNDING_SPACES_ALL_PATTERN = 
Regexp.new("\\s*(<[^>]+>)\\s*", Regexp::MULTILINE | Regexp::IGNORECASE)
TEMP_COND_COMMENT_PATTERN =

patterns for searching for temporary replacements

Regexp.new("%%%~COMPRESS~COND~(\\d+?)~%%%")
TEMP_PRE_PATTERN = 
Regexp.new("%%%~COMPRESS~PRE~(\\d+?)~%%%")
TEMP_TEXT_AREA_PATTERN = 
Regexp.new("%%%~COMPRESS~TEXTAREA~(\\d+?)~%%%")
TEMP_SCRIPT_PATTERN = 
Regexp.new("%%%~COMPRESS~SCRIPT~(\\d+?)~%%%")
TEMP_STYLE_PATTERN = 
Regexp.new("%%%~COMPRESS~STYLE~(\\d+?)~%%%")
TEMP_EVENT_PATTERN = 
Regexp.new("%%%~COMPRESS~EVENT~(\\d+?)~%%%")
TEMP_SKIP_PATTERN = 
Regexp.new("%%%~COMPRESS~SKIP~(\\d+?)~%%%")
TEMP_LINE_BREAK_PATTERN = 
Regexp.new("%%%~COMPRESS~LT~(\\d+?)~%%%")
JAVASCRIPT_COMPRESSORS_OPTIONS = 
{
  :closure => { :compilation_level => 'ADVANCED_OPTIMIZATIONS' },
  :yui => { :munge => true, :preserve_semicolons => true, :optimize => true, :line_break => nil }
}
CSS_COMPRESSORS_OPTIONS = 
{
  :yui => { :line_break => -1 }
}
DEFAULT_OPTIONS = 
{
  :enabled => true,

  # default settings
  :remove_comments => true,
  :remove_multi_spaces => true,

  # optional settings
  :javascript_compressor => :yui,
  :css_compressor => :yui,
  :remove_intertag_spaces => false,
  :remove_quotes => false,
  :compress_javascript => false,
  :compress_css => false,
  :simple_doctype => false,
  :remove_script_attributes => false,
  :remove_style_attributes => false,
  :remove_link_attributes => false,
  :remove_form_attributes => false,
  :remove_input_attributes => false,
  :simple_boolean_attributes => false,
  :remove_javascript_protocol => false,
  :remove_http_protocol => false,
  :remove_https_protocol => false,
  :preserve_line_breaks => false,
  :remove_surrounding_spaces => nil,

  :preserve_patterns => nil
}

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ Compressor 



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# File 'lib/htmlcompressor/compressor.rb', line 134

def initialize(options = {})

  @options = DEFAULT_OPTIONS.merge(options)

  if @options[:compress_js_templates]
    @options[:remove_quotes] = false

    js_template_types = [ 'text/x-jquery-tmpl' ]

    unless @options[:compress_js_templates].is_a? TrueClass
      js_template_types << @options[:compress_js_templates]
      js_template_types.flatten!
    end

    @options[:js_template_types] = js_template_types
  else
    @options[:js_template_types] = []
  end

  detect_external_compressors
end

Instance Method Details

#compress(html) ⇒ Object 



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# File 'lib/htmlcompressor/compressor.rb', line 192

def compress html
  if not @options[:enabled] or html.nil? or html.length == 0
    return html
  end

  # preserved block containers
  condCommentBlocks = []
  preBlocks = []
  taBlocks = []
  scriptBlocks = []
  styleBlocks = []
  eventBlocks = []
  skipBlocks = []
  lineBreakBlocks = []
  userBlocks = []

  # preserve blocks
  html = preserve_blocks(html, preBlocks, taBlocks, scriptBlocks, styleBlocks, eventBlocks, condCommentBlocks, skipBlocks, lineBreakBlocks, userBlocks)

  # process pure html
  html = process_html(html)

  # process preserved blocks
  process_preserved_blocks(preBlocks, taBlocks, scriptBlocks, styleBlocks, eventBlocks, condCommentBlocks, skipBlocks, lineBreakBlocks, userBlocks)

  # put preserved blocks back
  html = return_blocks(html, preBlocks, taBlocks, scriptBlocks, styleBlocks, eventBlocks, condCommentBlocks, skipBlocks, lineBreakBlocks, userBlocks)

  html
end

#detect_external_compressors ⇒ Object 



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# File 'lib/htmlcompressor/compressor.rb', line 156

def detect_external_compressors
  @javascript_compressors = {}
  @css_compressors = {}

  # Try Closure.
  begin
    require 'closure-compiler'
    @javascript_compressors[:closure] = Closure::Compiler
  rescue LoadError
  end

  # Try YUI
  begin
    require 'yui/compressor'
    @javascript_compressors[:yui] = YUI::JavaScriptCompressor
    @css_compressors[:yui] = YUI::CssCompressor
  rescue LoadError
  end
end

#get_css_compressor(compressor_name) ⇒ Object 



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# File 'lib/htmlcompressor/compressor.rb', line 184

def get_css_compressor(compressor_name)

  if @css_compressors.has_key? compressor_name
    @css_compressors[compressor_name].new CSS_COMPRESSORS_OPTIONS[compressor_name]
  end

end

#get_javascript_compressor(compressor_name) ⇒ Object 



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# File 'lib/htmlcompressor/compressor.rb', line 176

def get_javascript_compressor(compressor_name)

  if @javascript_compressors.has_key? compressor_name
    @javascript_compressors[compressor_name].new JAVASCRIPT_COMPRESSORS_OPTIONS[compressor_name]
  end

end