diff options
Diffstat (limited to 'lib/coderay/scanners/java_script2.rb')
| -rw-r--r-- | lib/coderay/scanners/java_script2.rb | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/lib/coderay/scanners/java_script2.rb b/lib/coderay/scanners/java_script2.rb new file mode 100644 index 0000000..42fa640 --- /dev/null +++ b/lib/coderay/scanners/java_script2.rb @@ -0,0 +1,240 @@ +# like java_script.rb +# - but uses instance instead of local variables for flags +# - but uses the same rule logic as java_script4.rb +# - also uses states array push/pop +module CodeRay +module Scanners + + # Scanner for JavaScript. + # + # Aliases: +ecmascript+, +ecma_script+, +javascript+ + class JavaScript2 < Scanner + + register_for :java_script2 + 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 setup + @state = :initial + end + + def scan_tokens encoder, options + + state, @string_delimiter = options[:state] || @state + if @string_delimiter + encoder.begin_group state + end + + @value_expected = true + @key_expected = false + @function_expected = false + + states = [state] + + until eos? + + case state + + when :initial + + if match = scan(/ \s+ | \\\n /x) + encoder.text_token match, :space + @value_expected = true if !@value_expected && match.index(?\n) + + elsif match = scan(%r! // [^\n\\]* (?: \\. [^\n\\]* )* | /\* (?: .*? \*/ | .*() ) !mx) + encoder.text_token match, :comment + @value_expected = true + # state = :open_multi_line_comment if self[1] + + elsif check(/\.?\d/) + 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 + @key_expected = @value_expected = false + + elsif @value_expected && match = scan(/<([[:alpha:]]\w*) (?: [^\/>]*\/> | .*?<\/\1>)/xim) + # TODO: scan over nested tags + xml_scanner.tokenize match, :tokens => encoder + @value_expected = false + + elsif match = scan(/ [-+*=<>?:;,!&^|(\[{~%]+ | \.(?!\d) /x) + encoder.text_token match, :operator + @value_expected = true + @key_expected = /[{,]$/ === match + @function_expected = false + + elsif match = scan(/ [)\]}]+ /x) + encoder.text_token match, :operator + @function_expected = @key_expected = @value_expected = false + + 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 + encoder.text_token match, kind + @function_expected = (kind == :keyword) && (match == 'function') + @key_expected = false + + elsif match = scan(/["']/) + state = (@key_expected && check(KEY_CHECK_PATTERN[match])) ? :key : :string + states << state + encoder.begin_group state + @string_delimiter = match + encoder.text_token match, :delimiter + + elsif @value_expected && (match = scan(/\//)) + state = :regexp + states << state + encoder.begin_group state + @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 match == '/' + modifiers = scan(/[gim]+/) + encoder.text_token modifiers, :modifier if modifiers && !modifiers.empty? + end + @string_delimiter = nil + @key_expected = @value_expected = false + encoder.end_group states.pop + state = states.last + 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 states.pop + state = states.last + encoder.text_token match, :error unless match.empty? + @string_delimiter = nil + @key_expected = @value_expected = false + else + raise_inspect "else case #{@string_delimiter} reached; %p not handled." % peek(1), encoder + end + + # when :open_multi_line_comment + # if match = scan(%r! .*? \*/ !mx) + # states.pop + # state = states.last + # else + # match = scan(%r! .+ !mx) + # end + # @value_expected = true + # encoder.text_token match, :comment if match + + else + #:nocov: + raise_inspect 'Unknown state: %p' % [state], encoder + #:nocov: + + end + + end + + if options[:keep_state] + @state = state, @string_delimiter + 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 |