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parseVariableExpression() function

Parses an expression that may contain Uniform variables and invokes a callback for each text or variable token found. The callback receives the token, its type, and offset — the index in serialized where the token's content begins. Because text tokens are always contiguous substrings of serialized, offset + token.indexOf(x) maps a position inside a text token back to the original string (which reconstructing from token lengths cannot do, since escape characters are stripped from token values).

Signature:

Parameters

Parameter	Type	Description
serialized	string
onToken	(token: string, type: 'text' | 'variable', offset: number) => void | false	(Optional)

Returns:

number

the number of tokens found in the string (variable or text)