Implied Multiplication

[mariuszgromada]

To introduce implied multiplication syntax.

[mariuszgromada]

• starting form v5.0 parser works in implied multiplication mode as default mode
• Implied multiplication can be disabled / enabled at the level of Expression object: e.disableImpliedMultiplicationMode(), e.enableImpliedMultiplicationMode()
• a method to check in what mode an expression operates was introduced: e.checkIfImpliedMultiplicationMode()
• special method to get modified expression string was introduced - meaning there is an option to see how parser is going to interpret given expression string: e.getCanonicalExpressionString()
• usage example is below

mXparser.setConsolePrefix("");
Expression e = new Expression("2(3+5)sin(2pi)pipi");

mXparser.consolePrintln("----- DEFAULT MODE -----");
mXparser.consolePrintln(e.getExpressionString() + " = " + e.getCanonicalExpressionString());
mXparser.consolePrintln();
e.checkSyntax();
mXparser.consolePrintln(e.getErrorMessage());

mXparser.consolePrintln("----- disableImpliedMultiplicationMode MODE -----");
e.disableImpliedMultiplicationMode();
mXparser.consolePrintln(e.getExpressionString() + " = " + e.getCanonicalExpressionString());
mXparser.consolePrintln();
e.checkSyntax();
mXparser.consolePrintln(e.getErrorMessage());

mXparser.consolePrintln("----- enableImpliedMultiplicationModeMODE -----");
e.enableImpliedMultiplicationMode();
mXparser.consolePrintln(e.getExpressionString() + " = " + e.getCanonicalExpressionString());
mXparser.consolePrintln();
e.checkSyntax();
mXparser.consolePrintln(e.getErrorMessage());

mXparser.consolePrintln("----- checkIfImpliedMultiplicationMode -----");
mXparser.consolePrintln("Implied Multiplication is on = " + e.checkIfImpliedMultiplicationMode());
e.disableImpliedMultiplicationMode();
mXparser.consolePrintln("Implied Multiplication is on = " + e.checkIfImpliedMultiplicationMode());

Result:

----- DEFAULT MODE -----
2(3+5)sin(2pi)pipi = 2*(3+5)*sin(2*pi)*pi*pi

[2(3+5)sin(2pi)pipi] checking ...
[2(3+5)sin(2pi)pipi] no errors.

----- disableImpliedMultiplicationMode MODE -----
2(3+5)sin(2pi)pipi = 2(3+5)sin(2pi)pipi

[2(3+5)sin(2pi)pipi] checking ...
[2(3+5)sin(2pi)pipi] (2pi, 8) invalid <TOKEN>.
[2(3+5)sin(2pi)pipi] (pipi, 10) invalid <TOKEN>.
[2(3+5)sin(2pi)pipi] errors were found.

----- enableImpliedMultiplicationMode MODE -----
2(3+5)sin(2pi)pipi = 2*(3+5)*sin(2*pi)*pi*pi

[2(3+5)sin(2pi)pipi] checking ...
[2(3+5)sin(2pi)pipi] no errors.

----- checkIfImpliedMultiplicationMode -----
Implied Multiplication is on = true
Implied Multiplication is on = false

I have the impression that it will be a very useful feature :-)

Best regards

[mariuszgromada]

Global Mode on / off also possible"

• mXparser.enableImpliedMultiplicationMode()
• mXparser.disableImpliedMultiplicationMode()
• mXparser.checkIfImpliedMultiplicationMode()

Global settings can be overwritten by local (expression level) settings.