condor.classad
Class Parser

Object
  condor.classad.Parser

class Parser

extends Object

This is the internal classad parser generated by byacc. From outside this package, it should be accessed through the wrapper class ClassAdParser.

Version:

2.0

Author:

Marvin Solomon

See Also:

ClassAdParser

Field Summary

(package private) boolean	acceptPrefix If true, accept when a prefix of the input matches.
static short	ERROR Internal code for a token.
(package private) PrintStream	errs Place to send error messages.
static short	FALSE Internal code for a token.
static short	IDENTIFIER Internal code for a token.
static short	INTEGER Internal code for a token.
static short	LEX_ERROR Internal code for a token.
static short	OP_EQ Internal code for a token.
static short	OP_GE Internal code for a token.
static short	OP_IS Internal code for a token.
static short	OP_ISNT Internal code for a token.
static short	OP_LAND Internal code for a token.
static short	OP_LE Internal code for a token.
static short	OP_LOR Internal code for a token.
static short	OP_NE Internal code for a token.
static short	OP_SHL Internal code for a token.
static short	OP_SHR Internal code for a token.
static short	OP_SHRR Internal code for a token.
static short	REAL Internal code for a token.
static short	STRING Internal code for a token.
(package private) boolean	tracing Set to true if parsing actions should be traced.
static short	TRUE Internal code for a token.
static short	UNARY Internal code for a token.
static short	UNDEFINED Internal code for a token.
(package private) int	verbosity Verbosity for error messages.

Constructor Summary

Parser(InputStream str)
Create a parser for parsing input from an InputStream.

Parser(Reader rdr)
Create a parser for parsing input from a Reader.

Parser(String str)
Create a parser for parsing a String.

Method Summary

int	curColumn() Returns the current input column.
int	curLine() Returns the current input line.
boolean	enableTracing(boolean on) Turn debug tracing on or off.
int	getNextToken() Get and remove the "lookahead" token: the first token not yet consumed by the parser.
int	nextToken() Get the "lookahead" token: the first token not yet consumed by the parser.
Object	nextValue() Get the value associated with the "lookahead" token: the first token not yet consumed by the parser.
Object	parse() Check whether the the unconsumed input is a syntactically valid phrase according to the grammar.
Object	parse(boolean acceptPrefix) Check whether the the unconsumed input is a syntactically valid phrase according to the grammar.
(package private) void	printMessage(String msg) Print a message, decorated with the current line and column number.
void	reset(InputStream str) Supply a new source of input to this Parser.
void	reset(Reader rdr) Supply a new source of input to this Parser.
void	reset(String str) Supply a new source of input to this Parser.

Methods inherited from class Object

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

Field Detail

ERROR

public static final short ERROR

Internal code for a token.

See Also:

Constant Field Values

FALSE

public static final short FALSE

Internal code for a token.

See Also:

Constant Field Values

IDENTIFIER

public static final short IDENTIFIER

Internal code for a token.

See Also:

Constant Field Values

INTEGER

public static final short INTEGER

Internal code for a token.

See Also:

Constant Field Values

LEX_ERROR

public static final short LEX_ERROR

Internal code for a token.

See Also:

Constant Field Values

REAL

public static final short REAL

Internal code for a token.

See Also:

Constant Field Values

STRING

public static final short STRING

Internal code for a token.

See Also:

Constant Field Values

TRUE

public static final short TRUE

Internal code for a token.

See Also:

Constant Field Values

UNDEFINED

public static final short UNDEFINED

Internal code for a token.

See Also:

Constant Field Values

OP_LOR

public static final short OP_LOR

Internal code for a token.

See Also:

Constant Field Values

OP_LAND

public static final short OP_LAND

Internal code for a token.

See Also:

Constant Field Values

OP_EQ

public static final short OP_EQ

Internal code for a token.

See Also:

Constant Field Values

OP_NE

public static final short OP_NE

Internal code for a token.

See Also:

Constant Field Values

OP_IS

public static final short OP_IS

Internal code for a token.

See Also:

Constant Field Values

OP_ISNT

public static final short OP_ISNT

Internal code for a token.

See Also:

Constant Field Values

OP_LE

public static final short OP_LE

Internal code for a token.

See Also:

Constant Field Values

OP_GE

public static final short OP_GE

Internal code for a token.

See Also:

Constant Field Values

OP_SHL

public static final short OP_SHL

Internal code for a token.

See Also:

Constant Field Values

OP_SHR

public static final short OP_SHR

Internal code for a token.

See Also:

Constant Field Values

OP_SHRR

public static final short OP_SHRR

Internal code for a token.

See Also:

Constant Field Values

UNARY

public static final short UNARY

Internal code for a token.

See Also:

Constant Field Values

tracing

boolean tracing

Set to true if parsing actions should be traced.

acceptPrefix

boolean acceptPrefix

If true, accept when a prefix of the input matches.

verbosity

int verbosity

Verbosity for error messages. Values are: 0 - no messages 1 - only show message and line number 2 - also echo line in question 3 - also list tokens expected

errs

PrintStream errs

Place to send error messages. Default is System.err.

Constructor Detail

Parser

public Parser(Reader rdr)

Create a parser for parsing input from a Reader.

Parameters:

rdr - the source of the input characters.

Parser

public Parser(InputStream str)

Create a parser for parsing input from an InputStream.

Parameters:

str - the source of the input characters.

Parser

public Parser(String str)

Create a parser for parsing a String.

Parameters:

str - the source of the input characters.

Method Detail

parse

public Object parse(boolean acceptPrefix)

Check whether the the unconsumed input is a syntactically valid phrase according to the grammar. Parsing stops at the end of the input, or the first token that cannot be included in a prefix of a valid phrase according to the grammar. If "acceptPrefix" is false and an invalid token is encountered before the end of the input, an error occurs. An error is also signaled if "acceptPrefix" is true but the input preceding the invalid token is not a valid phrase according the the grammar.

If the input is already at end of file when this method is called, it silently returns null. If an error occurs, a message is printed by calling the user-supplied method error(String) and the result is null. On success, the return value is the "semantic value" assigned by semantic routines to the start symbol.

Parameters:

acceptPrefix - if true, the input does not to be completely consumed.

Returns:

the "semantic value" corresponding to the phrase found or null for errors or end-of-file.

parse

public Object parse()

Check whether the the unconsumed input is a syntactically valid phrase according to the grammar. This method is equivalent to parse(true).

Returns:

the "semantic value" corresponding to the phrase found or null for errors or end-of-file.

enableTracing

public boolean enableTracing(boolean on)

Turn debug tracing on or off. Debugging output goes to System.out.

Parameters:

on - if true, turn tracing on; otherwise turn it off.

Returns:

the previous value.

reset

public void reset(Reader rdr)

Supply a new source of input to this Parser.

Parameters:

rdr - the new source of input.

reset

public void reset(InputStream str)

Supply a new source of input to this Parser.

Parameters:

str - the new source of input.

reset

public void reset(String str)

Supply a new source of input to this Parser.

Parameters:

str - the new source of input.

curLine

public int curLine()

Returns the current input line.

Returns:

the current line number.

curColumn

public int curColumn()

Returns the current input column.

Returns:

the current line number.

nextToken

public int nextToken()

Get the "lookahead" token: the first token not yet consumed by the parser. The token is not removed from the input stream.

Returns:

the code for the next token.

See Also:

getNextToken()

nextValue

public Object nextValue()

Get the value associated with the "lookahead" token: the first token not yet consumed by the parser. The token is not removed from the input stream.

Returns:

the value associated with the next token.

See Also:

nextToken()

getNextToken

public int getNextToken()

Get and remove the "lookahead" token: the first token not yet consumed by the parser. The token is removed from the input stream.

Returns:

the code for the next token.

See Also:

getNextToken()

printMessage

void printMessage(String msg)

Print a message, decorated with the current line and column number.

Parameters:

msg - the message to print.