Module lex 

The lexer: the single cssToken matcher the plugin installs on the engine, and the scanners it reads spans with.

CSS is context-sensitive — the same characters can begin a selector, a property or a value — so the matcher owns the hard tokenisation and the grammar only assembles typed nodes from what it emits. Which token comes out depends on the rule that is active when the character is read: the engine reads a token only when the alternate being tried needs one, under the rule trying it, and passes that rule to the matcher.

See ts/src/css.ts for the canonical commentary; the three ports are kept in step, and this module follows buildCssTokenMatcher there line for line.

Structs

Error

A parse failure.

Enums

Tin

A token kind.

Functions

es_is_whitespace

Whether c is whitespace as ECMAScript defines it, which is NOT what char::is_whitespace answers.

es_trim

Trim as JavaScript’s String.prototype.trim does. See es_is_whitespace for why this is not str::trim.

split_selectors

Split a selector-group prelude on its top-level commas (commas inside strings, () or [] are part of a single selector), stripping comments and trimming each selector. An empty prelude yields an empty list.

strip_comments

Remove /* ... */ comments from a selector or value run, leaving quoted strings (which may contain /*) untouched.

vendor_prefix

^(-[a-z]+-): a vendor prefix on an at-keyword, e.g. -webkit-keyframes.