Token

java.lang.Object
- Token

public class Token
extends java.lang.Object

A class that implements Tokens that might be read from a stream of postscript commands. There are, basically, four types of tokens:

Numbers - like 3, 1.4, etc.
Booleans - true or false,
Symbols - pi, myProcedure, quit, etc.
Procedures - lists of other tokens to be interpreted at a later time.

Example usage:

To read in the tokens of a postscript file, without interpretation, we might do the following:

  public static void main(String[] args)
  {
      int i=0;
      Reader r = new Reader();
      Token t;
      while (r.hasNext())
      {
          t = r.next();
          if (t.isSymbol() && // only if symbol:
              t.getSymbol().equals("quit")) break;
          // process token
          System.out.println(i+": "+t);
          i++;
      }
  }

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`BooleanKind` Token is a boolean.
`static int`	`NumberKind` Token is a number.
`static int`	`ProcedureKind` Token is a procedure.
`static int`	`SymbolKind` Token is a symbol.

Constructor Summary

Constructors
Constructor and Description
`Token(boolean bool)` Construct a boolean token
`Token(double value)` Construct a numeric token.
`Token(structure5.List<Token> proc)` Construct a procedure.
`Token(java.lang.String symbol)` Construct a symbol token

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`boolean`	`equals(java.lang.Object other)` Returns true if this token has the same value as the other.
`boolean`	`getBoolean()` Fetch boolean value of token, provided it's a boolean.
`double`	`getNumber()` Fetch numeric value of token, provided it's a number.
`structure5.List<Token>`	`getProcedure()` Fetch the list of tokens associated with a procedure token.
`java.lang.String`	`getSymbol()` Fetch string value of token, provided it's a symbol.
`boolean`	`isBoolean()` Returns true if and only if this token is a boolean.
`boolean`	`isNumber()` Returns true if and only if this token is a number.
`boolean`	`isProcedure()` Returns true if and only if this token is a procedure.
`boolean`	`isSymbol()` Returns true if and only if this token is a symbol.
`int`	`kind()` Return the kind of token.
`java.lang.String`	`toString()` Generates string representation of a token.

Methods inherited from class java.lang.Object
clone, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Field Detail
  - NumberKind
```
public static final int NumberKind
```
    Token is a number.
    
    See Also:
    
    Constant Field Values
  - BooleanKind
```
public static final int BooleanKind
```
    Token is a boolean.
    
    See Also:
    
    Constant Field Values
  - SymbolKind
```
public static final int SymbolKind
```
    Token is a symbol.
    
    See Also:
    
    Constant Field Values
  - ProcedureKind
```
public static final int ProcedureKind
```
    Token is a procedure.
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - Token
```
public Token(double value)
```
    Construct a numeric token.
    
    Parameters:
    
    value - the numeric value of the token
  - Token
```
public Token(boolean bool)
```
    Construct a boolean token
    
    Parameters:
    
    bool - the boolean value of the token
  - Token
```
public Token(java.lang.String symbol)
```
    Construct a symbol token
    
    Parameters:
    
    symbol - the string representing the token
  - Token
```
public Token(structure5.List<Token> proc)
```
    Construct a procedure.
    
    Parameters:
    
    proc - the list of tokens that make up the procedure.
- Method Detail
  - kind
```
public int kind()
```
    Return the kind of token. Great for use in switch statements.
    
    Returns:
    
    integer representing the kind of the token, usually Token.number, Token.symbol, etc.
  - isNumber
```
public boolean isNumber()
```
    Returns true if and only if this token is a number.
    
    Returns:
    
    true iff token is a number.
  - isBoolean
```
public boolean isBoolean()
```
    Returns true if and only if this token is a boolean.
    
    Returns:
    
    true iff token is a boolean.
  - isSymbol
```
public boolean isSymbol()
```
    Returns true if and only if this token is a symbol.
    
    Returns:
    
    true iff token is a symbol.
  - isProcedure
```
public boolean isProcedure()
```
    Returns true if and only if this token is a procedure.
    
    Returns:
    
    true iff token is a procedure.
  - getNumber
```
public double getNumber()
```
    Fetch numeric value of token, provided it's a number.
    
    Returns:
    
    token's numeric value.
  - getBoolean
```
public boolean getBoolean()
```
    Fetch boolean value of token, provided it's a boolean.
    
    Returns:
    
    token's boolean value.
  - getSymbol
```
public java.lang.String getSymbol()
```
    Fetch string value of token, provided it's a symbol.
    
    Returns:
    
    token's string value.
  - getProcedure
```
public structure5.List<Token> getProcedure()
```
    Fetch the list of tokens associated with a procedure token.
    
    Returns:
    
    a List of associated token values.
  - equals
```
public boolean equals(java.lang.Object other)
```
    Returns true if this token has the same value as the other. (Does not work correctly for procedures, but sufficient.)
    
    Overrides:
    
    equals in class java.lang.Object
    
    Parameters:
    
    other - another token
    
    Returns:
    
    true if and only if this token is equivalent to other
  - toString
```
public java.lang.String toString()
```
    Generates string representation of a token.
    
    Overrides:
    
    toString in class java.lang.Object
    
    Returns:
    
    a string representation of the token.

Class Token

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

NumberKind

BooleanKind

SymbolKind

ProcedureKind

Constructor Detail

Token

Token

Token

Token

Method Detail

kind

isNumber

isBoolean

isSymbol

isProcedure

getNumber

getBoolean

getSymbol

getProcedure

equals

toString