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	Description
static final int	TOKEN_AND
static final int	TOKEN_END
static final int	TOKEN_EQ
static final int	TOKEN_GE
static final int	TOKEN_GT
static final int	TOKEN_LBRACE
static final int	TOKEN_LE
static final int	TOKEN_LT
static final int	TOKEN_NOT
static final int	TOKEN_NOT_EQ
static final int	TOKEN_OR
static final int	TOKEN_RBRACE
static final int	TOKEN_STRING

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	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 Details

TOKEN_STRING

public static final int TOKEN_STRING

See Also:

• Constant Field Values

TOKEN_AND

public static final int TOKEN_AND

See Also:

• Constant Field Values

TOKEN_OR

public static final int TOKEN_OR

See Also:

• Constant Field Values

TOKEN_NOT

public static final int TOKEN_NOT

See Also:

• Constant Field Values

TOKEN_EQ

public static final int TOKEN_EQ

See Also:

• Constant Field Values

TOKEN_NOT_EQ

public static final int TOKEN_NOT_EQ

See Also:

• Constant Field Values

TOKEN_RBRACE

public static final int TOKEN_RBRACE

See Also:

• Constant Field Values

TOKEN_LBRACE

public static final int TOKEN_LBRACE

See Also:

• Constant Field Values

TOKEN_GE

public static final int TOKEN_GE

See Also:

• Constant Field Values

TOKEN_LE

public static final int TOKEN_LE

See Also:

• Constant Field Values

TOKEN_GT

public static final int TOKEN_GT

See Also:

• Constant Field Values

TOKEN_LT

public static final int TOKEN_LT

See Also:

• Constant Field Values

TOKEN_END

public static final int TOKEN_END

See Also:

• Constant Field Values

Constructor Details

ExpressionTokenizer

public ExpressionTokenizer(String expr)

Creates a new parser for the specified expression.

Parameters:

expr - The expression

Method Details

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.