Package org.openrefine.grel

Class Parser

java.lang.Object

org.openrefine.grel.Parser

public class Parser
extends Object

Field Summary

Fields

Modifier and Type	Field	Description
protected String	_languagePrefix
protected GrelExpr	_root
protected Scanner	_scanner
protected Scanner.Token	_token
static LanguageSpecificParser	grelParser

Constructor Summary

Constructors

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

Method Summary

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

Methods inherited from class java.lang.Object

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

Field Detail

grelParser

public static LanguageSpecificParser grelParser

_scanner

protected Scanner _scanner

_token

protected Scanner.Token _token

_root

protected GrelExpr _root

_languagePrefix

protected String _languagePrefix

Constructor Detail

Parser

public Parser(String s,
              String languagePrefix)
       throws ParsingException

Throws:

ParsingException

Parser

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

Throws:

ParsingException

Method Detail

getExpression

public Evaluable getExpression()

next

protected void next(boolean regexPossible)

makeException

protected ParsingException makeException(String desc)

parseExpression

protected GrelExpr parseExpression()
                            throws ParsingException

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

Throws:

ParsingException

parseSubExpression

protected GrelExpr parseSubExpression()
                               throws ParsingException

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

Throws:

ParsingException

parseTerm

protected GrelExpr parseTerm()
                      throws ParsingException

<term> := <factor> | <term> [ "*" "/" "%" ] <factor>

Throws:

ParsingException

parseFactor

protected GrelExpr parseFactor()
                        throws ParsingException

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

Throws:

ParsingException

parseExpressionList

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

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

Throws:

ParsingException

makeArray

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