Package com.google.refine.grel

Class Parser

java.lang.Object

com.google.refine.grel.Parser

public class Parser
extends Object

Field Summary

Fields

Modifier and Type	Field	Description
protected Evaluable	_root
protected Scanner	_scanner
protected Scanner.Token	_token

Constructor Summary

Constructors

Constructor	Description
Parser(String s)
Parser(String s, int from, int to)

Method Summary

Modifier and Type	Method	Description
Evaluable	getExpression()
protected Evaluable[]	makeArray(List<Evaluable> l)
protected ParsingException	makeException(String desc)
protected void	next(boolean regexPossible)
protected Evaluable	parseExpression()	:= <sub-expression> | [ "<" "<=" ">" ">=" "==" "!=" ] <sub-expression>
protected List<Evaluable>	parseExpressionList(String closingDelimiter)	<expression-list> := | ( "," )*
protected Evaluable	parseFactor()	:= <term-start> ( <path-segment> )* <term-start> := | | - | | | ( <expression-list> ) <path-segment> := "[" <expression-list> "]" | "." | "." "(" <expression-list> ")"
protected Evaluable	parseSubExpression()	<sub-expression> := | <sub-expression> [ "+" "-" ]
protected Evaluable	parseTerm()	:= | [ "*" "/" "%" ]

Methods inherited from class java.lang.Object

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

Field Details

_scanner

protected Scanner _scanner

_token

protected Scanner.Token _token

_root

protected Evaluable _root

Constructor Details

Parser

public Parser(String s)
       throws ParsingException

Throws:

ParsingException

Parser

public Parser(String s,
 int from,
 int to)
       throws ParsingException

Throws:

ParsingException

Method Details

getExpression

public Evaluable getExpression()

next

protected void next(boolean regexPossible)

makeException

protected ParsingException makeException(String desc)

parseExpression

protected Evaluable parseExpression()
                             throws ParsingException

:= <sub-expression> | [ "<" "<=" ">" ">=" "==" "!=" ] <sub-expression>

Throws:

ParsingException

parseSubExpression

protected Evaluable parseSubExpression()
                                throws ParsingException

<sub-expression> := | <sub-expression> [ "+" "-" ]

Throws:

ParsingException

parseTerm

protected Evaluable parseTerm()
                       throws ParsingException

:= | [ "*" "/" "%" ]

Throws:

ParsingException

parseFactor

protected Evaluable parseFactor()
                         throws ParsingException

:= <term-start> ( <path-segment> )* <term-start> := | | - | | | ( <expression-list> ) <path-segment> := "[" <expression-list> "]" | "." | "." "(" <expression-list> ")"

Throws:

ParsingException

parseExpressionList

protected List<Evaluable> parseExpressionList(String closingDelimiter)
                                       throws ParsingException

<expression-list> := | ( "," )*

Throws:

ParsingException

makeArray

protected Evaluable[] makeArray(List<Evaluable> l)