GrammarToken   

is a grammar rules pattern object that represents any input of the specified form.

Details

GrammarToken is used in GrammarRules, along with FixedOrder, AnyOrder, etc.
GrammarToken works with any form supported by Interpreter.
New forms can be introduced by giving rules for GrammarToken["string"] in GrammarRules.

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Deploy a grammar that makes use of a built-in GrammarToken:

Apply the grammar to an input:

Deploy a grammar that defines and uses an "Appliance" token:

Apply the grammar to an input:

A custom GrammarToken can be used before and after its definition in the GrammarRules:

New tokens can be used to build up complicated expressions, e.g. to deploy a simple calculator:

Apply the calculator grammar and actions:

If a definition is given for a built-in GrammarToken, the given definition is used, not the built-in one:

Apply the new definition to an input string:

The replacement for GrammarToken["City"] prevents use of the usual one by this grammar:

Introduced in 2014

(10.0)

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