The contexts in an extending syntax will be a combination of the contexts from the parent syntax, and all those defined under the contexts key.Ĭontexts with the same name will override contexts from the parent syntax. Thus, an extending syntax may change a variable from a parent syntax, and all usage of the variable in the parent contexts will use the overridden value. Variable substitution is performed after all variable values have been realized. Variables with the same name will override previous values. When extending a syntax, the variables key is merged with the parent syntax. All other top-level keys, such as file_extensions and scope will not be inherited. For example:Ī syntax using inheritance will inherit the variables and contexts values from its parent syntax. The packages path will start with Packages/ and will contain the package name and syntax filename.

When inheriting a syntax, the key extends is used with a value containing the packages path to the parent syntax. In situations where a syntax is a slight variant of another, with some additions or changes, inheritance is a useful tool.

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