sjm.examples.query
Class ComparisonParser

java.lang.Object
  |
  +--sjm.examples.query.ComparisonParser

public class ComparisonParser

extends java.lang.Object

This utility class provides support to the Jaql parser, specifically for expression() and comparison() subparsers. The grammar this class supports is:

	
     comparison = arg operator arg;
     arg        = expression | QuotedString;
     expression = term ('+' term | '-' term)*;
     term       = factor ('*' factor | '/' factor)*;
     factor     = '(' expression ')' | Num | variable;
     variable   = Word;
     operator   = "<" | ">" | "=" | "<=" | ">=" | "!=";
 

Field Summary

protected Sequence	expression
protected Speller	speller

Constructor Summary

ComparisonParser(Speller speller)
Construct a ComparisonParser that will consult the given speller for the proper spelling of variable names.

Method Summary

Parser	arg() Returns a parser that will recognize a comparison argument.
Parser	comparison() Returns a parser that will recognize a comparison.
protected Parser	divideFactor()
Parser	expression() Returns a parser that will recognize an arithmetic expression.
protected Parser	factor()
protected Parser	minusTerm()
protected Parser	operator()
protected Parser	plusTerm()
protected Parser	term()
protected Parser	timesFactor()
protected Parser	variable()

Methods inherited from class java.lang.Object

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

Field Detail

expression

protected Sequence expression

speller

protected Speller speller

Constructor Detail

ComparisonParser

public ComparisonParser(Speller speller)

Construct a ComparisonParser that will consult the given speller for the proper spelling of variable names.

Method Detail

arg

public Parser arg()

Returns a parser that will recognize a comparison argument.

comparison

public Parser comparison()

Returns a parser that will recognize a comparison.

divideFactor

protected Parser divideFactor()

expression

public Parser expression()

Returns a parser that will recognize an arithmetic expression.

factor

protected Parser factor()

minusTerm

protected Parser minusTerm()

operator

protected Parser operator()

plusTerm

protected Parser plusTerm()

term

protected Parser term()

timesFactor

protected Parser timesFactor()

variable

protected Parser variable()