module CodeRay module Scanners # Scanner for JavaScript. # # Aliases: +ecmascript+, +ecma_script+, +javascript+ class JavaScript < Scanner register_for :java_script file_extension 'js' # The actual JavaScript keywords. KEYWORDS = %w[ break case catch continue default delete do else finally for function if in instanceof new return switch throw try typeof var void while with ] # :nodoc: PREDEFINED_CONSTANTS = %w[ false null true undefined NaN Infinity ] # :nodoc: MAGIC_VARIABLES = %w[ this arguments ] # :nodoc: arguments was introduced in JavaScript 1.4 KEYWORDS_EXPECTING_VALUE = WordList.new.add %w[ case delete in instanceof new return throw typeof with ] # :nodoc: # Reserved for future use. RESERVED_WORDS = %w[ abstract boolean byte char class debugger double enum export extends final float goto implements import int interface long native package private protected public short static super synchronized throws transient volatile ] # :nodoc: IDENT_KIND = WordList.new(:ident). add(RESERVED_WORDS, :reserved). add(PREDEFINED_CONSTANTS, :predefined_constant). add(MAGIC_VARIABLES, :local_variable). add(KEYWORDS, :keyword) # :nodoc: ESCAPE = / [bfnrtv\n\\'"] | x[a-fA-F0-9]{1,2} | [0-7]{1,3} /x # :nodoc: UNICODE_ESCAPE = / u[a-fA-F0-9]{4} | U[a-fA-F0-9]{8} /x # :nodoc: REGEXP_ESCAPE = / [bBdDsSwW] /x # :nodoc: STRING_CONTENT_PATTERN = { "'" => /[^\\']+/, '"' => /[^\\"]+/, '/' => /[^\\\/]+/, } # :nodoc: KEY_CHECK_PATTERN = { "'" => / (?> [^\\']* (?: \\. [^\\']* )* ) ' \s* : /mx, '"' => / (?> [^\\"]* (?: \\. [^\\"]* )* ) " \s* : /mx, } # :nodoc: protected def scan_tokens encoder, options state = :initial string_delimiter = nil value_expected = true key_expected = false function_expected = false until eos? case state when :initial if match = scan(/ \s+ | \\\n /x) value_expected = true if !value_expected && match.index(?\n) encoder.text_token match, :space elsif match = scan(%r! // [^\n\\]* (?: \\. [^\n\\]* )* | /\* (?: .*? \*/ | .* ) !mx) value_expected = true encoder.text_token match, :comment elsif check(/\.?\d/) key_expected = value_expected = false if match = scan(/0[xX][0-9A-Fa-f]+/) encoder.text_token match, :hex elsif match = scan(/(?>0[0-7]+)(?![89.eEfF])/) encoder.text_token match, :octal elsif match = scan(/\d+[fF]|\d*\.\d+(?:[eE][+-]?\d+)?[fF]?|\d+[eE][+-]?\d+[fF]?/) encoder.text_token match, :float elsif match = scan(/\d+/) encoder.text_token match, :integer end elsif value_expected && match = scan(/<([[:alpha:]]\w*) (?: [^\/>]*\/> | .*?<\/\1>)/xim) # TODO: scan over nested tags xml_scanner.tokenize match, :tokens => encoder value_expected = false next elsif match = scan(/ [-+*=<>?:;,!&^|(\[{~%]+ | \.(?!\d) /x) value_expected = true last_operator = match[-1] key_expected = (last_operator == ?{) || (last_operator == ?,) function_expected = false encoder.text_token match, :operator elsif match = scan(/ [)\]}]+ /x) function_expected = key_expected = value_expected = false encoder.text_token match, :operator elsif match = scan(/ [$a-zA-Z_][A-Za-z_0-9$]* /x) kind = IDENT_KIND[match] value_expected = (kind == :keyword) && KEYWORDS_EXPECTING_VALUE[match] # TODO: labels if kind == :ident if match.index(?$) # $ allowed inside an identifier kind = :predefined elsif function_expected kind = :function elsif check(/\s*[=:]\s*function\b/) kind = :function elsif key_expected && check(/\s*:/) kind = :key end end function_expected = (kind == :keyword) && (match == 'function') key_expected = false encoder.text_token match, kind elsif match = scan(/["']/) if key_expected && check(KEY_CHECK_PATTERN[match]) state = :key else state = :string end encoder.begin_group state string_delimiter = match encoder.text_token match, :delimiter elsif value_expected && (match = scan(/\//)) encoder.begin_group :regexp state = :regexp string_delimiter = '/' encoder.text_token match, :delimiter elsif match = scan(/ \/ /x) value_expected = true key_expected = false encoder.text_token match, :operator else encoder.text_token getch, :error end when :string, :regexp, :key if match = scan(STRING_CONTENT_PATTERN[string_delimiter]) encoder.text_token match, :content elsif match = scan(/["'\/]/) encoder.text_token match, :delimiter if state == :regexp modifiers = scan(/[gim]+/) encoder.text_token modifiers, :modifier if modifiers && !modifiers.empty? end encoder.end_group state string_delimiter = nil key_expected = value_expected = false state = :initial elsif state != :regexp && (match = scan(/ \\ (?: #{ESCAPE} | #{UNICODE_ESCAPE} ) /mox)) if string_delimiter == "'" && !(match == "\\\\" || match == "\\'") encoder.text_token match, :content else encoder.text_token match, :char end elsif state == :regexp && match = scan(/ \\ (?: #{ESCAPE} | #{REGEXP_ESCAPE} | #{UNICODE_ESCAPE} ) /mox) encoder.text_token match, :char elsif match = scan(/\\./m) encoder.text_token match, :content elsif match = scan(/ \\ | $ /x) encoder.end_group state encoder.text_token match, :error key_expected = value_expected = false state = :initial else raise_inspect "else case \" reached; %p not handled." % peek(1), encoder end else raise_inspect 'Unknown state', encoder end end if [:string, :regexp].include? state encoder.end_group state end encoder end protected def reset_instance super @xml_scanner.reset if defined? @xml_scanner end def xml_scanner @xml_scanner ||= CodeRay.scanner :xml, :tokens => @tokens, :keep_tokens => true, :keep_state => false end end end end