com.rychlik.calculator.parser

Class Calculator

java.lang.Object

com.rychlik.calculator.parser.Calculator

All Implemented Interfaces:

CalculatorConstants

public class Calculator
extends java.lang.Object
implements CalculatorConstants

This class implements a parser for a simple arithmetical language.

Field Summary

Fields

Modifier and Type	Field and Description
Token	jj_nt Next token.
Token	token Current token.
CalculatorTokenManager	token_source Generated Token Manager.

Fields inherited from interface com.rychlik.calculator.parser.CalculatorConstants

AND, ASSIGN, BEGIN, BREAK, COMMA, CONSTANT, CONTINUE, DEFAULT, DEFINE, DIGIT, DIVIDE, ELSE, END, EOF, EOL, EQ, EXP, FLOAT, GE, GT, ID, IF, ILLEGAL, INTEGER, LE, LETTER, LPAREN, LT, MINUS, MULTIPLY, NE, OR, PLUS, PRINT, RETURN, RPAREN, SEPARATOR, tokenImage, WHILE

Constructor Summary

Constructors

Constructor and Description
Calculator()
Calculator(CalculatorTokenManager tm) Constructor with generated Token Manager.
Calculator(java.io.InputStream stream) Constructor with InputStream.
Calculator(java.io.InputStream stream, java.lang.String encoding) Constructor with InputStream and supplied encoding
Calculator(java.io.Reader stream) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
int	arglist()
void	assignment()
void	breakStatement()
void	checkIdentifier(java.lang.String id) Check whether id is a legal identifier.
int	compileStream()
int	compileString(java.lang.String s)
void	conjunction()
void	continueStatement()
void	definition()
void	disable_tracing() Disable tracing.
void	disjunction()
void	enable_tracing() Enable tracing.
double	evalStream()
double	evalString(java.lang.String s)
void	expression()
void	factor()
void	funcall()
ParseException	generateParseException() Generate ParseException.
Token	getNextToken() Get the next Token.
Token	getToken(int index) Get the specific Token.
void	identifier()
void	ifStatement()
void	logical()
void	oneLine()
void	power()
void	print()
void	program()
void	ReInit(CalculatorTokenManager tm) Reinitialise.
void	ReInit(java.io.InputStream stream) Reinitialise.
void	ReInit(java.io.InputStream stream, java.lang.String encoding) Reinitialise.
void	ReInit(java.io.Reader stream) Reinitialise.
void	relational()
void	returnStatement()
void	setStackMachine(StackMachine sm)
void	signed_factor()
void	signed_power()
void	signed_term()
void	simple_expression()
void	sum()
void	term()
void	whileStatement()

Methods inherited from class java.lang.Object

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

Field Detail

token_source

public CalculatorTokenManager token_source

Generated Token Manager.

token

public Token token

Current token.

jj_nt

public Token jj_nt

Next token.

Constructor Detail

Calculator

public Calculator()

Calculator

public Calculator(java.io.InputStream stream)

Constructor with InputStream.

Calculator

public Calculator(java.io.InputStream stream,
          java.lang.String encoding)

Constructor with InputStream and supplied encoding

Calculator

public Calculator(java.io.Reader stream)

Constructor.

Calculator

public Calculator(CalculatorTokenManager tm)

Constructor with generated Token Manager.

Method Detail

setStackMachine

public void setStackMachine(StackMachine sm)

compileStream

public int compileStream()
                  throws ParseException

Throws:

ParseException

evalStream

public double evalStream()
                  throws ParseException

Throws:

ParseException

compileString

public int compileString(java.lang.String s)
                  throws ParseException

Parameters:

s - String to be evaluated.

Returns:

The value of the expression.

Throws:

ParseException - Thrown when the string does not represent a syntactically correct expression.

evalString

public double evalString(java.lang.String s)
                  throws ParseException

Parameters:

s - String to be evaluated.

Returns:

The value of the expression.

Throws:

ParseException - Thrown when the string does not represent a syntactically correct expression.

checkIdentifier

public void checkIdentifier(java.lang.String id)
                     throws ParseException

Check whether id is a legal identifier.

Parameters:

id - The name of the variable

Throws:

ParseException - if id is not a valid identifier.

program

public final void program()
                   throws ParseException

Throws:

ParseException

oneLine

public final void oneLine()
                   throws ParseException

Throws:

ParseException

print

public final void print()
                 throws ParseException

Throws:

ParseException

ifStatement

public final void ifStatement()
                       throws ParseException

Throws:

ParseException

whileStatement

public final void whileStatement()
                          throws ParseException

Throws:

ParseException

expression

public final void expression()
                      throws ParseException

Throws:

ParseException

simple_expression

public final void simple_expression()
                             throws ParseException

Throws:

ParseException

logical

public final void logical()
                   throws ParseException

Throws:

ParseException

conjunction

public final void conjunction()
                       throws ParseException

Throws:

ParseException

disjunction

public final void disjunction()
                       throws ParseException

Throws:

ParseException

relational

public final void relational()
                      throws ParseException

Throws:

ParseException

assignment

public final void assignment()
                      throws ParseException

Throws:

ParseException

definition

public final void definition()
                      throws ParseException

Throws:

ParseException

continueStatement

public final void continueStatement()
                             throws ParseException

Throws:

ParseException

breakStatement

public final void breakStatement()
                          throws ParseException

Throws:

ParseException

returnStatement

public final void returnStatement()
                           throws ParseException

Throws:

ParseException

funcall

public final void funcall()
                   throws ParseException

Throws:

ParseException

sum

public final void sum()
               throws ParseException

Throws:

ParseException

term

public final void term()
                throws ParseException

Throws:

ParseException

power

public final void power()
                 throws ParseException

Throws:

ParseException

signed_term

public final void signed_term()
                       throws ParseException

Throws:

ParseException

signed_power

public final void signed_power()
                        throws ParseException

Throws:

ParseException

signed_factor

public final void signed_factor()
                         throws ParseException

Throws:

ParseException

factor

public final void factor()
                  throws ParseException

Throws:

ParseException

identifier

public final void identifier()
                      throws ParseException

Throws:

ParseException

arglist

public final int arglist()
                  throws ParseException

Throws:

ParseException

ReInit

public void ReInit(java.io.InputStream stream)

Reinitialise.

ReInit

public void ReInit(java.io.InputStream stream,
          java.lang.String encoding)

Reinitialise.

ReInit

public void ReInit(java.io.Reader stream)

Reinitialise.

ReInit

public void ReInit(CalculatorTokenManager tm)

Reinitialise.

getNextToken

public final Token getNextToken()

Get the next Token.

getToken

public final Token getToken(int index)

Get the specific Token.

generateParseException

public ParseException generateParseException()

Generate ParseException.

enable_tracing

public final void enable_tracing()

Enable tracing.

disable_tracing

public final void disable_tracing()

Disable tracing.