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require 'parse/lexer'
module ActionScript
module Parse
class CommentToken < ASToken
end
class NumberToken < ASToken
end
class HexNumberToken < ASToken
end
class SingleLineCommentToken < CommentToken
def to_s
"//#{@body}"
end
end
class MultiLineCommentToken < CommentToken
def to_s
"/*#{@body}*/"
end
end
class WhitespaceToken < ASToken
end
class IdentifierToken < ASToken
end
class StringToken < ASToken
def initialize(body, lineno)
@body = unescape(body)
@lineno = lineno
end
def to_s
"\"#{escape(@body)}\""
end
def escape(text)
text.gsub(/./m) do
case $&
when "\\" then "\\\\"
when "\"" then "\\\""
when "\n" then "\\n"
when "\t" then "\\t"
else $&
end
end
end
def unescape(text)
escape = false
text.gsub(/./) do
if escape
escape = false
case $&
when "\\" then "\\"
when "n" then "\n"
when "t" then "\t"
else $&
end
else
case $&
when "\\" then escape=true; ""
else $&
end
end
end
end
end
# "get" and "set" where initially included in this list, since they are used
# as modifiers to function declarations. The are also allowed to appear as
# identifiers, unfortunately, so we treat them as such, and have the parser
# make special checks on the identifier body.
Keywords = [
"as",
"break",
"case",
"catch",
"class",
"const",
"continue",
"default",
"dynamic", # non-ECMA
"delete",
"do",
"else",
"extends",
"false",
"finally",
"for",
"function",
"if",
"implements", # reserved, but unused in ECMA
"import",
"in",
"instanceof",
"interface", # reserved, but unused in ECMA
"intrinsic", # non-ECMA
# "is", # not a keyword in AS
# "namespace", # not a keyword in AS
"new",
"null",
# "package", # can be an identifier is AS
"private",
"public",
"return",
"static", # non-ECMA
"super",
"switch",
"this",
"throw",
"true",
"try",
"typeof",
"use",
"var",
"void",
"while",
"with"
]
Reserved = [
"abstract",
"debugger",
"enum",
"export",
"goto",
"native",
"protected",
"synchronized",
"throws",
"transient",
"volatile"
]
Punctuation = [
[:DivideAssign, "/="],
[:Divide, "/"],
[:BitNot, "~"],
[:RBrace, "}"],
[:OrAssign, "||="],
[:Or, "||"],
[:BitOrAssign, "|="],
[:BitOr, "|"],
[:LBrace, "{"],
[:XOrAssign, "^^="],
[:XOr, "^^"],
[:BitXOrAssign, "^="],
[:BitXOr, "^"],
[:RBracket, "]"],
[:LBracket, "["],
[:Hook, "?"],
[:RShiftUnsignedAssign, ">>>="],
[:RShiftUnsigned, ">>>"],
[:RShiftAssign, ">>="],
[:RShift, ">>"],
[:GreaterEquals, ">="],
[:Greater, ">"],
[:Same, "==="],
[:Equals, "=="],
[:Assign, "="],
[:LessEquals, "<="],
[:LShiftAssign, "<<="],
[:LShift, "<<"],
[:Less, "<"],
[:Semicolon, ";"],
[:Member, "::"],
[:Colon, ":"],
[:Ellipsis, "..."],
[:Dot, "."],
[:MinusAssign, "-="],
[:Decrement, "--"],
[:Minus, "-"],
[:Comma, ","],
[:PlusAssign, "+="],
[:Increment, "++"],
[:Plus, "+"],
[:StarAssign, "*="],
[:Star, "*"],
[:RParen, ")"],
[:LParen, "("],
[:BitAndAssign, "&="],
[:AndAssign, "&&="],
[:And, "&&"],
[:BitAnd, "&"],
[:ModuloAssign, "%="],
[:Modulo, "%"],
[:BangSame, "!=="],
[:BangEquals, "!="],
[:Bang, "!"]
]
h = "[0-9a-fA-F]"
nl = "\\n|\\r\\n|\\r|\\f"
nonascii = "[\\200-\\377]"
unicode = "\\\\#{h}{1,6}[ \\t\\r\\n\\f]?"
escape = "(?:#{unicode}|\\\\[ -~\\200-\\377])"
nmstart = "(?:[a-zA-Z_$]|#{nonascii}|#{escape})"
nmchar = "(?:[a-zA-Z0-9_$]|#{nonascii}|#{escape})"
SINGLE_LINE_COMMENT = "//([^\n\r]*)"
OMULTI_LINE_COMMENT = "/\\*"
CMULTI_LINE_COMMENT = "\\*/"
STRING_START1 = "'"
STRING_END1 = "((?:(?:\\\\')|[\\t !\#$%&(-~]|#{nl}|\"|#{nonascii}|#{escape})*)\'"
STRING_START2 = '"'
STRING_END2 = "((?:(?:\\\\\")|[\\t !\#$%&(-~]|#{nl}|'|#{nonascii}|#{escape})*)\""
WHITESPACE = "[ \t\r\n\f]+"
IDENT = "#{nmstart}#{nmchar}*"
# name = "#{nmchar}+"
NUM = "[0-9]+|[0-9]*\\.[0-9]+"
HEX_NUM = "0x#{h}+"
# string = "#{string1}|#{string2}"
w = "[ \t\r\n\f]*"
class ASLexer < AbstractLexer
def lex_simple_token(class_sym, match, io)
ActionScript::Parse.const_get(class_sym).new(io.lineno-1)
end
def lex_key_or_ident_token(match, io)
body = match[0]
class_sym = @@keyword_tokens[body]
if class_sym
lex_simple_token(class_sym, match, io)
else
lex_simplebody_token(:IdentifierToken, match, io)
end
end
def self.keyword_tokens=(toks)
@@keyword_tokens = toks
end
def lex_simplebody_token(class_sym, match, io)
ActionScript::Parse.const_get(class_sym).new(match[0], io.lineno-1)
end
def lex_singlelinecoomment_token(class_sym, match, io)
SingleLineCommentToken.new(match[1], io.lineno-1)
end
def lex_multilinecomment_token(class_sym, match, io)
lineno = io.lineno-1
line = match.post_match
comment = ''
until line =~ /\*\//o
comment << line
line = io.readline;
end
comment << $`
match.string = $'
MultiLineCommentToken.new(comment, lineno)
end
def lex_string1_token(class_sym, match, io)
lineno = io.lineno-1
line = match.post_match
str = ''
until line =~ /#{STRING_END1}/o
str << line
line = io.readline;
raise "#{lineno}:unexpected EOF in string" if line.nil?
end
str << $1
match.string = $'
StringToken.new(str, lineno)
end
def lex_string2_token(class_sym, match, io)
lineno = io.lineno-1
line = match.post_match
str = ''
until line =~ /#{STRING_END2}/o
str << line
line = io.readline;
raise "#{lineno}:unexpected EOF in string" if line.nil?
end
str << $1
match.string = $'
StringToken.new(str, lineno)
end
end
def self.build_lexer
builder = LexerBuilder.new(ActionScript::Parse)
# TODO: whitespace tokens don't span lines, which might not be the expected
# behaviour
builder.add_match(WHITESPACE, :lex_simplebody_token, :WhitespaceToken)
builder.add_match(SINGLE_LINE_COMMENT, :lex_singlelinecoomment_token, :SingleLineCommentToken)
builder.add_match(OMULTI_LINE_COMMENT, :lex_multilinecomment_token, :MultiLineCommentToken)
keyword_tokens = {}
Keywords.each do |keyword|
builder.create_keytoken_class(keyword)
keyword_tokens[keyword] = "#{keyword.capitalize}Token".to_sym
end
ASLexer.keyword_tokens = keyword_tokens
Punctuation.each do |punct|
builder.make_punctuation_token(*punct)
end
builder.add_match(IDENT, :lex_key_or_ident_token, nil)
builder.add_match(STRING_START1, :lex_string1_token, :StringToken)
builder.add_match(STRING_START2, :lex_string2_token, :StringToken)
builder.add_match(HEX_NUM, :lex_simplebody_token, :HexNumberToken)
builder.add_match(NUM, :lex_simplebody_token, :NumberToken)
builder.build_lexer(ASLexer)
end
build_lexer
class SkipASLexer
def initialize(lexer)
@lex = lexer
@handler = nil
end
def handler=(handler)
@handler = handler
end
def get_next
while skip?(tok=@lex.get_next)
notify(tok)
end
tok
end
def peek_next
while skip?(tok=@lex.peek_next)
notify(tok)
@lex.get_next
end
tok
end
protected
def skip?(tok)
tok.is_a?(CommentToken) || tok.is_a?(WhitespaceToken)
end
def notify(tok)
unless @handler.nil?
@handler.comment(tok.body)
end
end
end
end # module Parse
end # module ActionScript
# vim:shiftwidth=2:softtabstop=2