[CSS Grid Layout] Tokenizer for parsing grid-template-areas's value.

• Component: Layout and Rendering
• Status: NEW ---

[Javier Fernandez]

The current CSS Grid Layout specification defines the following process to parse the grid-templates-area's string value.

Tokenize the string into a list of the following tokens, using longest-match semantics:

* A sequence of name code points, representing a named cell token with a name consisting of its code points.
* A "." (U+002E FULL STOP), representing a null cell token.
* A sequence of whitespace, representing nothing (do not produce a token).
* A sequence of any other characters, representing a trash token.