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Mathematica > Systems Interfaces & Deployment > Mathematica Sessions > Session Customization >

Built-in Mathematica Symbol

$SyntaxHandler

$SyntaxHandler
is a global variable which, if set, is applied to any input string that is found to contain a syntax error.

The arguments given to $SyntaxHandler are the complete input string and an integer specifying the character position at which the syntax error was detected.

Any string returned by $SyntaxHandler is used as a new version of the input string, and is fed to Mathematica. If the string does not end with a newline, Mathematica waits for input to complete the line.

If $SyntaxHandler returns $Failed, input to Mathematica is abandoned if possible.