Package gnu.ecmascript

Class Lexer

java.lang.Object

java.io.Reader

gnu.text.Lexer

gnu.ecmascript.Lexer

All Implemented Interfaces:

Closeable, AutoCloseable, Readable

public class Lexer
extends Lexer

Reads EcmaScript token from a InPort.

Field Summary

Fields

Modifier and Type	Field	Description
static final Char	colonToken
static final Char	commaToken
static final Char	condToken
static final Char	dotToken
static final Reserved	elseToken
static final Object	eofToken
static final Object	eolToken
static final Char	equalToken
static final Char	lbraceToken
static final Char	lbracketToken
static final Char	lparenToken
static final Reserved	newToken
static final Char	notToken
static final Char	rbraceToken
static final Char	rbracketToken
static final Char	rparenToken
static final Char	semicolonToken
static final Char	tildeToken

Fields inherited from class gnu.text.Lexer

nesting, port, tentative, tokenBuffer, tokenBufferLength

Fields inherited from class java.io.Reader

lock

Constructor Summary

Constructors

Constructor	Description
Lexer(gnu.kawa.io.InPort port)

Method Summary

Modifier and Type	Method	Description
static Object	checkReserved(String name)
String	getIdentifier(int ch)
Double	getNumericLiteral(int c)
String	getStringLiteral(char quote)
Object	getToken()	Returns the next token.
static Object	getToken(gnu.kawa.io.InPort inp)
static void	main(String[] args)
Object	maybeAssignment(Object token)

Methods inherited from class gnu.text.Lexer

checkErrors, checkNext, clearErrors, close, eofError, eofError, error, error, error, fatal, getColumnNumber, getErrors, getLineNumber, getMessages, getName, getPort, isInteractive, isTentative, mark, peek, popNesting, pushNesting, read, read, readCodePoint, readDelimited, readDigits, readDigitsInBuffer, readIntDigits, readOptionalExponent, readUnicodeChar, reset, seenErrors, setInteractive, setMessages, setTentative, skip, skip_quick, tokenBufferAppend, tokenBufferString, unread, unread, unread_quick

Methods inherited from class java.io.Reader

mark, markSupported, nullReader, read, read, ready, skip, transferTo

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

lparenToken

public static final Char lparenToken

rparenToken

public static final Char rparenToken

lbraceToken

public static final Char lbraceToken

rbraceToken

public static final Char rbraceToken

lbracketToken

public static final Char lbracketToken

rbracketToken

public static final Char rbracketToken

dotToken

public static final Char dotToken

condToken

public static final Char condToken

commaToken

public static final Char commaToken

colonToken

public static final Char colonToken

equalToken

public static final Char equalToken

tildeToken

public static final Char tildeToken

notToken

public static final Char notToken

semicolonToken

public static final Char semicolonToken

eolToken

public static final Object eolToken

eofToken

public static final Object eofToken

elseToken

public static final Reserved elseToken

newToken

public static final Reserved newToken

Constructor Details

Lexer

public Lexer(gnu.kawa.io.InPort port)

Method Details

checkReserved

public static Object checkReserved(String name)

getNumericLiteral

public Double getNumericLiteral(int c)
                         throws IOException

Throws:

IOException

getStringLiteral

public String getStringLiteral(char quote)
                        throws IOException,
SyntaxException

Throws:

IOException

SyntaxException

getIdentifier

public String getIdentifier(int ch)
                     throws IOException

Throws:

IOException

maybeAssignment

public Object maybeAssignment(Object token)
                       throws IOException,
SyntaxException

Throws:

IOException

SyntaxException

getToken

public Object getToken()
                throws IOException,
SyntaxException

Returns the next token. Returns:

end-of-file

Sequence.eofValue

end-of-line

eolToken

reserved word

???

identifier

a java.lang.String

punctuator

???

Literals are returned a QuoteExp objects, Specifically:

numeric literal

a QuoteExp of a java.lang.Double value

boolean literal

a QuoteExp of java.lang.Boolean.TRUE or FALSE

null literal

a QuoteExp whose value is null

string literal

a QuoteExp whose value is a String

Throws:

IOException

SyntaxException

getToken

public static Object getToken(gnu.kawa.io.InPort inp)
                       throws IOException,
SyntaxException

Throws:

IOException

SyntaxException

main

public static void main(String[] args)