jmathlib.core.interpreter
Class Parser

java.lang.Object
  jmathlib.core.interpreter.RootObject
      jmathlib.core.interpreter.Parser

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, ErrorCodes, TokenConstants

public class Parser
extends RootObject
implements TokenConstants, ErrorCodes

The parser uses the Lexer to produce a list of tokens which it builds into an abstract syntax tree.

See Also:

Serialized Form

Field Summary

java.lang.String

evaluationLockWords

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

Parser()
default constructor - creates the Parser object with an empty string

Method Summary

Token	getNextToken() get next token from the lexical analyser
java.lang.String	getScannedLineOfCode() return the currently scanned line of code to identify the possible errors.
OperandToken	parseExpression(java.lang.String expression) Parse an expression and return an operand tree of the expression
OperandToken	parseRemainingExpression() parse remaining tokens of a m-function file or m-script file
Token	peekNextToken() get next Token from lexical analyser, without moving forward
void	setExpression(java.lang.String expression) set expression of a m-function file or m-script file.

Methods inherited from class jmathlib.core.interpreter.RootObject

clone, toString

Methods inherited from class java.lang.Object

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

Field Detail

evaluationLockWords

public java.lang.String evaluationLockWords

Constructor Detail

Parser

public Parser()

default constructor - creates the Parser object with an empty string

Method Detail

parseExpression

public OperandToken parseExpression(java.lang.String expression)

Parse an expression and return an operand tree of the expression

Parameters:

expression - = a vector of tokens

Returns:

the parsed expressions as a tree of operands

setExpression

public void setExpression(java.lang.String expression)

set expression of a m-function file or m-script file. This method is used for parsing m-scripts/functions.

Parameters:

expression - = code of a function as a string

parseRemainingExpression

public OperandToken parseRemainingExpression()

parse remaining tokens of a m-function file or m-script file

Returns:

the parsed expresssion

getScannedLineOfCode

public java.lang.String getScannedLineOfCode()

return the currently scanned line of code to identify the possible errors. (e.g. a=sin(3]+4 is an eroror and returns a=sin(3] to display to the user

Returns:

the currently scanned line of code

getNextToken

public Token getNextToken()

get next token from the lexical analyser

Returns:

the next token

peekNextToken

public Token peekNextToken()

get next Token from lexical analyser, without moving forward

Returns:

the next token