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module CodeRay
module Scanners
class JavaScript < Scanner
include Streamable
register_for :java_script
file_extension 'js'
# The actual JavaScript keywords.
KEYWORDS = %w[
break case catch continue default delete do else
false finally for function if in instanceof new null
return switch throw true try typeof var void while with
]
MAGIC_VARIABLES = %w[ this arguments ] # arguments was introduced in JavaScript 1.4
KEYWORDS_EXPECTING_VALUE = WordList.new.add %w[
case delete in instanceof new return throw typeof while with
]
# 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
]
IDENT_KIND = WordList.new(:ident).
add(RESERVED_WORDS, :reserved).
add(MAGIC_VARIABLES, :local_variable).
add(KEYWORDS, :keyword)
ESCAPE = / [bfnrtv\n\\'"] | x[a-fA-F0-9]{1,2} | [0-7]{1,3} /x
UNICODE_ESCAPE = / u[a-fA-F0-9]{4} | U[a-fA-F0-9]{8} /x
REGEXP_ESCAPE = / [bBdDsSwW] /x
STRING_CONTENT_PATTERN = {
"'" => /[^\\']+/,
'"' => /[^\\"]+/,
'/' => /[^\\\/]+/,
}
def scan_tokens tokens, options
state = :initial
string_delimiter = nil
value_expected = true
key_expected = false
until eos?
kind = nil
match = nil
case state
when :initial
if match = scan(/ \s+ | \\\n /x)
value_expected = true if !value_expected && match.index(?\n)
tokens << [match, :space]
next
elsif scan(%r! // [^\n\\]* (?: \\. [^\n\\]* )* | /\* (?: .*? \*/ | .* ) !mx)
value_expected = true
kind = :comment
elsif scan(/[+-]?(?:\d+)(?![.eEfF])/)
value_expected = false
kind = :integer
elsif match = scan(/ [-+*=<>?:;,!&^|(\[{~%]+ | \.(?!\d) /x)
value_expected = true
last_operator = match[-1]
key_expected = (last_operator == ?{) || (last_operator == ?,)
kind = :operator
elsif scan(/ [)\]}]+ /x)
key_expected = value_expected = false
kind = :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]
if kind == :ident
if match.index(?$)
kind = :predefined
elsif key_expected && check(/\s*:/)
kind = :key
end
end
key_expected = false
elsif match = scan(/["']/)
tokens << [:open, :string]
state = :string
string_delimiter = match
kind = :delimiter
elsif value_expected && (match = scan(/\/(?=\S)/))
tokens << [:open, :regexp]
state = :regexp
string_delimiter = '/'
kind = :delimiter
elsif scan(/ \/ /x)
value_expected = true
key_expected = false
kind = :operator
elsif scan(/0[xX][0-9A-Fa-f]+/)
key_expected = value_expected = false
kind = :hex
elsif scan(/(?:0[0-7]+)(?![89.eEfF])/)
key_expected = value_expected = false
kind = :oct
elsif scan(/\d[fF]?|\d*\.\d+(?:[eE][+-]?\d+)?[fF]?|\d+[eE][+-]?\d+[fF]?/)
key_expected = value_expected = false
kind = :float
else
getch
kind = :error
end
when :string, :regexp
if scan(STRING_CONTENT_PATTERN[string_delimiter])
kind = :content
elsif match = scan(/["'\/]/)
tokens << [match, :delimiter]
if state == :regexp
modifiers = scan(/[gim]+/)
tokens << [modifiers, :modifier] if modifiers && !modifiers.empty?
end
tokens << [:close, state]
string_delimiter = nil
key_expected = value_expected = false
state = :initial
next
elsif state == :string && (match = scan(/ \\ (?: #{ESCAPE} | #{UNICODE_ESCAPE} ) /mox))
if string_delimiter == "'" && !(match == "\\\\" || match == "\\'")
kind = :content
else
kind = :char
end
elsif state == :regexp && scan(/ \\ (?: #{ESCAPE} | #{REGEXP_ESCAPE} | #{UNICODE_ESCAPE} ) /mox)
kind = :char
elsif scan(/\\./m)
kind = :content
elsif scan(/ \\ | $ /x)
tokens << [:close, :delimiter]
kind = :error
key_expected = value_expected = false
state = :initial
else
raise_inspect "else case \" reached; %p not handled." % peek(1), tokens
end
else
raise_inspect 'Unknown state', tokens
end
match ||= matched
if $DEBUG and not kind
raise_inspect 'Error token %p in line %d' %
[[match, kind], line], tokens
end
raise_inspect 'Empty token', tokens unless match
tokens << [match, kind]
end
if [:string, :regexp].include? state
tokens << [:close, state]
end
tokens
end
end
end
end
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