Package com.singularsys.extensions.structure

Class StructuredGrammarParser

java.lang.Object

com.singularsys.extensions.structure.StructuredGrammarParser

All Implemented Interfaces:

GrammarParser, Serializable

public class StructuredGrammarParser
extends Object
implements Serializable, GrammarParser

A grammar parser which works with structured programming.

Author:

Richard Morris

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected Lookahead2Iterator<Token>	it

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
Node	parse(Iterator<Token> input)	Main entry point used by the ConfigurableParser
Node	parsePrefixSuffix()	Callback function used by GrammarMatchers 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 Details

it

protected transient Lookahead2Iterator<Token> it

Constructor Details

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 Details

parse

public Node parse(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 GrammarMatchers 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