jmathlib.core.interpreter
Class LexicalAnalyser

java.lang.Object
  jmathlib.core.interpreter.LexicalAnalyser

All Implemented Interfaces:

ErrorCodes, TokenConstants

public class LexicalAnalyser
extends java.lang.Object
implements TokenConstants, ErrorCodes

class for turning a string expression into a vector of tokens. All public methods are static so there is no need to instantiate it. it creates an instance of itself when the analyseExpression function is called.

Field Summary

Fields inherited from interface jmathlib.core.constants.TokenConstants

ADDSUB_PRIORITY, AND_PRIORITY, ANDAND_PRIORITY, ASSIGN_PRIORITY, BRACKET_PRIORITY, COMPARE_PRIORITY, CONCAT, MATRIX, MULDIV_PRIORITY, OR_PRIORITY, OROR_PRIORITY, PARAMETER, POWER_PRIORITY, RELATION_PRIORITY, SINGLE, ttDelimiter, ttNotSet, ttOperand, ttOperator

Fields inherited from interface jmathlib.core.constants.ErrorCodes

ERR_BRACKET_OPEN, ERR_BRACKET_ORDER, ERR_FUNCTION_NOT_FOUND, ERR_FUNCTION_NOT_IMPLEMENTED, ERR_INSUFFICIENT_PARAMETERS, ERR_INVALID_PARAMETER, ERR_LVALUE_REQUIRED, ERR_MATRIX_SINGULAR, ERR_NOT_SQUARE_MATRIX, ERR_OPNOTSUPPORTED, ERR_TOO_MANY_PARAMETERS, ERR_USER_ERROR, ERR_VARIABLE_NOTDEFINED, OK, OK_FUNCTION_PROCESS

Constructor Summary

LexicalAnalyser()
default constructor - creates the lexical analyser object with an empty string

Method Summary

void	analyseExpression(java.lang.String expression) Interface function used to analyse an expression
boolean	EOChars() return true if no more characters are available for parsing
Token	getNextToken(int type)
java.lang.String	getScannedLineOfCode() return string of currently scanned line of code for error message

Methods inherited from class java.lang.Object

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

Constructor Detail

LexicalAnalyser

public LexicalAnalyser()

default constructor - creates the lexical analyser object with an empty string

Method Detail

analyseExpression

public void analyseExpression(java.lang.String expression)

Interface function used to analyse an expression

Parameters:

expression - - expression to be analysed

getNextToken

public Token getNextToken(int type)

Returns:

the next token in the input string

getScannedLineOfCode

public java.lang.String getScannedLineOfCode()

return string of currently scanned line of code for error message

EOChars

public boolean EOChars()

return true if no more characters are available for parsing