Argument	Description
`callback`	Function to call when this grammar is updated.

Return values
Returns a Disposable on which `.dispose()` can be called to unsubscribe.

Argument	Description
`text`	A String containing one or more lines.

Return values
Returns an Array of token arrays for each line tokenized.

Tokenize the line of text.

Argument	Description
`line`	A String of text to tokenize.
`ruleStack`	An optional Array of rules previously returned from this method. This should be null when tokenizing the first line in the file.
`firstLine`	A optional Boolean denoting whether this is the first line in the file which defaults to `false`. This should be `true` when tokenizing the first line in the file.

Return values

Return values
Returns an Object containing the following properties: `line` The String of text that was tokenized. `tags` An Array of integer scope ids and strings. Positive ids indicate the beginning of a scope, and negative tags indicate the end. To resolve ids to scope names, call GrammarRegistry::scopeForId with the absolute value of the id. `tokens` This is a dynamic property. Invoking it will incur additional overhead, but will automatically translate the `tags` into token objects with `value` and `scopes` properties. `ruleStack` An Array of rules representing the tokenized state at the end of the line. These should be passed back into this method when tokenizing the next line in the file.

Returns an Object containing the following properties:

line The String of text that was tokenized.
tags An Array of integer scope ids and strings. Positive ids indicate the beginning of a scope, and negative tags indicate the end. To resolve ids to scope names, call GrammarRegistry::scopeForId with the absolute value of the id.
tokens This is a dynamic property. Invoking it will incur additional overhead, but will automatically translate the tags into token objects with value and scopes properties.
ruleStack An Array of rules representing the tokenized state at the end of the line. These should be passed back into this method when tokenizing the next line in the file.

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Grammar Extended