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