org.apache.catalina.ssi

Class ExpressionTokenizer

java.lang.Object

org.apache.catalina.ssi.ExpressionTokenizer

public class ExpressionTokenizer
extends Object

Parses an expression string to return the individual tokens. This is patterned similar to the StreamTokenizer in the JDK but customized for SSI conditional expression parsing.

Author:

Paul Speed

Field Summary

Fields

Modifier and Type	Field and Description
static int	TOKEN_AND
static int	TOKEN_END
static int	TOKEN_EQ
static int	TOKEN_GE
static int	TOKEN_GT
static int	TOKEN_LBRACE
static int	TOKEN_LE
static int	TOKEN_LT
static int	TOKEN_NOT
static int	TOKEN_NOT_EQ
static int	TOKEN_OR
static int	TOKEN_RBRACE
static int	TOKEN_STRING

Constructor Summary

Constructors

Constructor and Description
ExpressionTokenizer(String expr) Creates a new parser for the specified expression.

Method Summary

Modifier and Type	Method and Description
int	getIndex()
String	getTokenValue()
boolean	hasMoreTokens()
protected boolean	isMetaChar(char c)
int	nextToken()

Methods inherited from class java.lang.Object

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

Field Detail

TOKEN_STRING

public static final int TOKEN_STRING

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Constant Field Values

TOKEN_AND

public static final int TOKEN_AND

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Constant Field Values

TOKEN_OR

public static final int TOKEN_OR

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Constant Field Values

TOKEN_NOT

public static final int TOKEN_NOT

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Constant Field Values

TOKEN_EQ

public static final int TOKEN_EQ

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Constant Field Values

TOKEN_NOT_EQ

public static final int TOKEN_NOT_EQ

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Constant Field Values

TOKEN_RBRACE

public static final int TOKEN_RBRACE

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Constant Field Values

TOKEN_LBRACE

public static final int TOKEN_LBRACE

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Constant Field Values

TOKEN_GE

public static final int TOKEN_GE

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Constant Field Values

TOKEN_LE

public static final int TOKEN_LE

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Constant Field Values

TOKEN_GT

public static final int TOKEN_GT

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Constant Field Values

TOKEN_LT

public static final int TOKEN_LT

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Constant Field Values

TOKEN_END

public static final int TOKEN_END

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Constant Field Values

Constructor Detail

ExpressionTokenizer

public ExpressionTokenizer(String expr)

Creates a new parser for the specified expression.

Parameters:

expr - The expression

Method Detail

hasMoreTokens

public boolean hasMoreTokens()

Returns:

true if there are more tokens.

getIndex

public int getIndex()

Returns:

the current index for error reporting purposes.

isMetaChar

protected boolean isMetaChar(char c)

nextToken

public int nextToken()

Returns:

the next token type and initializes any state variables accordingly.

getTokenValue

public String getTokenValue()

Returns:

the String value of the token if it was type TOKEN_STRING. Otherwise null is returned.