Package ch.andre601.expressionparser.tokens.readers

Class TokenReader

java.lang.Object

ch.andre601.expressionparser.tokens.readers.TokenReader

Direct Known Subclasses:

NonQuotedLiteralTokenReader, NumberTokenReader, PatternTokenReader, QuotedLiteralTokenReader

public abstract class TokenReader
extends Object

The token reader is used to find specific patterns within a provided text to then turn into a Token, "tokenizing" the text over time.

Constructor Summary

Constructors

Constructor	Description
TokenReader(int priority)	Constructor for creating a new TokenReader.

Method Summary

Modifier and Type	Method	Description
int	getPriority()	Priority of the TokenReader instance.
abstract Token	read(String text, ParsePosition position, ParseWarnCollector collector)	Abstract method that is called by the ExpressionparserEngine to turn the provided String into a token.

Methods inherited from class java.lang.Object

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

Constructor Details

TokenReader

public TokenReader(int priority)

Constructor for creating a new TokenReader.

Parameters:

priority - The priority this TokenReader should have.

Method Details

getPriority

public int getPriority()

Priority of the TokenReader instance.

Returns:

Priority of the TokenReader instance.

read

public abstract Token read(String text,
 ParsePosition position,
 ParseWarnCollector collector)

Abstract method that is called by the ExpressionparserEngine to turn the provided String into a token.
The provided ParsePosition instance indicates the current position within the String and should be updated accordingly when parsing the String to a Token.

Assuming the DefaultExpressionParserEngine is used, returning null will result in skipping this TokenReader.

Parameters:

text - The text to parse.

position - The current position within the text.

collector - Instance of the ParseWarnCollector used for the parsing.

Returns:

Possibly-null Token instance.