Package com.inductiveautomation.snap.parse

Class Parser

java.lang.Object

com.inductiveautomation.snap.parse.Parser

Direct Known Subclasses:

JavaParser, ParseUtils.DebugParser

public class Parser
extends Object

A class to parse a given input (string) using given rule(s).

Constructor Summary

Constructors

Constructor	Description
Parser()	Creates a new Parser.
Parser(ParseRule aRule)	Creates a new Parser for given rule.

Method Summary

Modifier and Type	Method	Description
protected ParseNode	createNode(ParseRule aRule, Token aStartToken, Token anEndToken)	Creates a node for given rule and start/end tokens (returns a shared node by default).
protected ParseRule	createRule()	Creates the top level rule.
protected Tokenizer	createTokenizer()	Creates the tokenizer instance and initializes patters from rule.
protected Tokenizer	createTokenizerImpl()	Creates the tokenizer instance.
CharSequence	getInput()	Returns the current parse character input.
protected Token	getLookAheadToken(int anIndex)	Returns the look ahead token at given index.
protected Token	getNextToken()	Fetches and returns the next token.
ParseRule	getRule()	Returns the top level rule.
Token	getToken()	Returns the current token.
Tokenizer	getTokenizer()	Returns the tokenizer.
protected int	lookAhead(ParseRule aRule, int aLookAhead, int aTokenIndex, int aPathIndex, int aRuleIndex)	Returns a parse node if this rule matches string.
ParseNode	parse()	Parses input and returns ParseNode.
protected ParseNode	parse(ParseRule aRule, ParseHandler aHandler)	Returns a parse node if this rule matches string.
ParseNode	parse(CharSequence anInput)	Parses a given input and returns ParseNode (convenience).
<T> T	parseCustom(CharSequence anInput, Class<T> aClass)	Parses given input and returns custom parse tree node (convenience).
<T> T	parseCustom(Class<T> aClass)	Parses input and returns custom parse tree node.
protected void	parseFailed(ParseRule aRule, ParseHandler aHandler, ParseRule.Count aCount)	Called when parse fails.
Parser	setInput(CharSequence aSequence)	Sets the current parse string.
void	setRule(ParseRule aRule)	Sets the top level rule.
protected void	setTokenizer(Tokenizer aTokenizer)	Sets the tokenizer.

Methods inherited from class java.lang.Object

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

Constructor Details

Parser

public Parser()

Creates a new Parser.

Parser

public Parser(ParseRule aRule)

Creates a new Parser for given rule.

Method Details

getRule

public ParseRule getRule()

Returns the top level rule.

setRule

public void setRule(ParseRule aRule)

Sets the top level rule.

createRule

protected ParseRule createRule()

Creates the top level rule.

getInput

public CharSequence getInput()

Returns the current parse character input.

setInput

public Parser setInput(CharSequence aSequence)

Sets the current parse string.

getTokenizer

public Tokenizer getTokenizer()

Returns the tokenizer.

createTokenizer

protected Tokenizer createTokenizer()

Creates the tokenizer instance and initializes patters from rule.

createTokenizerImpl

protected Tokenizer createTokenizerImpl()

Creates the tokenizer instance.

setTokenizer

protected void setTokenizer(Tokenizer aTokenizer)

Sets the tokenizer.

getToken

public Token getToken()

Returns the current token.

getNextToken

@Nonnull
protected Token getNextToken()

Fetches and returns the next token.

getLookAheadToken

protected Token getLookAheadToken(int anIndex)

Returns the look ahead token at given index.

parse

public ParseNode parse()

Parses input and returns ParseNode.

parseCustom

public <T> T parseCustom(Class<T> aClass)

Parses input and returns custom parse tree node.

parse

protected ParseNode parse(ParseRule aRule,
 ParseHandler aHandler)

Returns a parse node if this rule matches string.

createNode

protected ParseNode createNode(ParseRule aRule,
 Token aStartToken,
 Token anEndToken)

Creates a node for given rule and start/end tokens (returns a shared node by default).

lookAhead

protected int lookAhead(ParseRule aRule,
 int aLookAhead,
 int aTokenIndex,
 int aPathIndex,
 int aRuleIndex)

Returns a parse node if this rule matches string.

parseFailed

protected void parseFailed(ParseRule aRule,
 ParseHandler aHandler,
 ParseRule.Count aCount)

Called when parse fails.

parse

public ParseNode parse(CharSequence anInput)

Parses a given input and returns ParseNode (convenience).

parseCustom

public <T> T parseCustom(CharSequence anInput,
 Class<T> aClass)

Parses given input and returns custom parse tree node (convenience).