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.

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    static final int
    TOKEN_AND
    Token type for the AND operator.
    static final int
    TOKEN_END
    Token type indicating end of expression.
    static final int
    TOKEN_EQ
    Token type for the equality operator.
    static final int
    TOKEN_GE
    Token type for the greater-than-or-equal operator.
    static final int
    TOKEN_GT
    Token type for the greater-than operator.
    static final int
    TOKEN_LBRACE
    Token type for a left brace.
    static final int
    TOKEN_LE
    Token type for the less-than-or-equal operator.
    static final int
    TOKEN_LT
    Token type for the less-than operator.
    static final int
    TOKEN_NOT
    Token type for the NOT operator.
    static final int
    TOKEN_NOT_EQ
    Token type for the not-equal operator.
    static final int
    TOKEN_OR
    Token type for the OR operator.
    static final int
    TOKEN_RBRACE
    Token type for a right brace.
    static final int
    TOKEN_STRING
    Token type for a string literal.

  • 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()
    Returns the current index in the expression.
    String
    getTokenValue()
    Returns the string value of the most recently parsed token.
    boolean
    hasMoreTokens()
    Checks if there are more tokens available.
    protected boolean
    isMetaChar(char c)
    Checks if the given character is a meta character used for tokenization.
    int
    nextToken()
    Parses the next token from the expression.

    Methods inherited from class Object

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

  • Field Details

    • TOKEN_STRING

      public static final int TOKEN_STRING
      Token type for a string literal.
      See Also:

    • TOKEN_AND

      public static final int TOKEN_AND
      Token type for the AND operator.
      See Also:

    • TOKEN_OR

      public static final int TOKEN_OR
      Token type for the OR operator.
      See Also:

    • TOKEN_NOT

      public static final int TOKEN_NOT
      Token type for the NOT operator.
      See Also:

    • TOKEN_EQ

      public static final int TOKEN_EQ
      Token type for the equality operator.
      See Also:

    • TOKEN_NOT_EQ

      public static final int TOKEN_NOT_EQ
      Token type for the not-equal operator.
      See Also:

    • TOKEN_RBRACE

      public static final int TOKEN_RBRACE
      Token type for a right brace.
      See Also:

    • TOKEN_LBRACE

      public static final int TOKEN_LBRACE
      Token type for a left brace.
      See Also:

    • TOKEN_GE

      public static final int TOKEN_GE
      Token type for the greater-than-or-equal operator.
      See Also:

    • TOKEN_LE

      public static final int TOKEN_LE
      Token type for the less-than-or-equal operator.
      See Also:

    • TOKEN_GT

      public static final int TOKEN_GT
      Token type for the greater-than operator.
      See Also:

    • TOKEN_LT

      public static final int TOKEN_LT
      Token type for the less-than operator.
      See Also:

    • TOKEN_END

      public static final int TOKEN_END
      Token type indicating end of expression.
      See Also:

  • 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()
      Checks if there are more tokens available.
      Returns:
      true if there are more tokens

    • getIndex

      public int getIndex()
      Returns the current index in the expression.
      Returns:
      the current index for error reporting purposes

    • isMetaChar

      protected boolean isMetaChar(char c)
      Checks if the given character is a meta character used for tokenization.
      Parameters:
      c - the character to check
      Returns:
      true if the character is whitespace or an operator character

    • nextToken

      public int nextToken()
      Parses the next token from the expression.
      Returns:
      the next token type constant

    • getTokenValue

      public String getTokenValue()
      Returns the string value of the most recently parsed token.
      Returns:
      the string value if the token was of type TOKEN_STRING, otherwise null