com.singularsys.extensions.structure

Class StructuredGrammarParser

java.lang.Object

com.singularsys.extensions.structure.StructuredGrammarParser

All Implemented Interfaces:

GrammarParser, java.io.Serializable

public class StructuredGrammarParser
extends java.lang.Object
implements java.io.Serializable, GrammarParser

A grammar parser which works with structured programming.

Author:

Richard Morris

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected Lookahead2Iterator<Token>	it

Constructor Summary

Constructors

Constructor and Description
StructuredGrammarParser(GrammaticalRuleI head, GrammarParser sy) Construct the parser

Method Summary

Modifier and Type	Method and Description
Node	parse(java.util.Iterator<Token> input) Main entry point used by the ConfigurableParser
Node	parsePrefixSuffix() Callback function used by GrammerMatchers where the matcher expects a simple number, variable, or function call with optional, prefix or suffix operator.
Node	parseSubExpression() Calls the parseSubExpression method of the ShuntingYard
void	setIterator(Lookahead2Iterator<Token> it) Set the iterator used by the GrammarParser.parseSubExpression()

Methods inherited from class java.lang.Object

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

Field Detail

it

protected transient Lookahead2Iterator<Token> it

Constructor Detail

StructuredGrammarParser

public StructuredGrammarParser(GrammaticalRuleI head,
                               GrammarParser sy)

Construct the parser

Parameters:

head - root of the rules for parsing the structured grammar

sy - base parser for expressions

Method Detail

parse

public Node parse(java.util.Iterator<Token> input)
           throws ParseException

Description copied from interface: GrammarParser

Main entry point used by the ConfigurableParser

Specified by:

parse in interface GrammarParser

Parameters:

input - iterator with the list of tokens

Returns:

the generated parser tree

Throws:

ParseException - if the input cannot be parsed

setIterator

public void setIterator(Lookahead2Iterator<Token> it)

Description copied from interface: GrammarParser

Set the iterator used by the GrammarParser.parseSubExpression()

Specified by:

setIterator in interface GrammarParser

Parameters:

it - the iterator

parseSubExpression

public Node parseSubExpression()
                        throws ParseException

Calls the parseSubExpression method of the ShuntingYard

Specified by:

parseSubExpression in interface GrammarParser

Returns:

the root node of the matched sub expression.

Throws:

ParseException - if the input cannot be parsed

parsePrefixSuffix

public Node parsePrefixSuffix()
                       throws ParseException

Description copied from interface: GrammarParser

Callback function used by GrammerMatchers where the matcher expects a simple number, variable, or function call with optional, prefix or suffix operator.

Specified by:

parsePrefixSuffix in interface GrammarParser

Returns:

the root node of the matched sub expression.

Throws:

ParseException - if the input cannot be parsed