Package snap.parse

Class GrammarParser

java.lang.Object

snap.parse.Parser

snap.parse.GrammarParser

public class GrammarParser
extends Parser

A Parser to parse simple snap grammar rule files.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	GrammarParser.AndExprHandler	AndExpr Handler: { CountExpr CountExpr* }
static class	GrammarParser.CountExprHandler	CountExpr Handler: { Primary ( "*" "+" "?" )? }
static class	GrammarParser.ExpressionHandler	Expression Handler: { AndExpr ( "|" AndExpr )* }
static class	GrammarParser.GrammarHandler	Grammar Handler: { ParseRule* }
static class	GrammarParser.ParseRuleHandler	ParseRule Handler: { Name "{" Expression "}" }
static class	GrammarParser.PrimaryHandler	Primary Handler: { String | "LookAhead" "(" (Number | Expression) ")" | Name | "(" Expression ")" }

Nested classes/interfaces inherited from class snap.parse.Parser

Parser.HandlerRef

Constructor Summary

Constructors

Constructor	Description
GrammarParser()	Constructor.

Method Summary

Modifier and Type	Method	Description
protected Grammar	createGrammar()	Creates a new ParseRule rule.
protected Tokenizer	createTokenizer()	Override to allow rules files to have standard Java single/multiple line comments.
Grammar	parseGrammarString(String grammarStr)	Parses given grammar string and returns grammar.

Methods inherited from class snap.parse.Parser

clearTokens, createNode, getCharIndex, getGrammar, getInput, getLastProcessedToken, getLastValidToken, getLookAheadToken, getNextToken, getPrimaryRule, getRuleForName, getToken, getTokenizer, initGrammar, lookAhead, parse, parse, parse, parse, parseCustom, parseCustom, parseFailed, setCharIndex, setInput, setTokenizer

Methods inherited from class java.lang.Object

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

Constructor Details

GrammarParser

public GrammarParser()

Constructor.

Method Details

parseGrammarString

public Grammar parseGrammarString(String grammarStr)

Parses given grammar string and returns grammar.

createGrammar

protected Grammar createGrammar()

Creates a new ParseRule rule.
Grammar { ParseRule* } ParseRule { Name "{" Expression "}" } Expression { AndExpr ( "|" AndExpr )* } AndExpr { CountExpr CountExpr* } CountExpr { Primary ( "*" "+" "?" )? } Primary { String | "LookAhead" "(" (Number | Expression) ")" | Name | "(" Expression ")"

Overrides:

createGrammar in class Parser

createTokenizer

protected Tokenizer createTokenizer()

Override to allow rules files to have standard Java single/multiple line comments.

Overrides:

createTokenizer in class Parser