Fast CSS parser engineered for runtime use

A computer-implemented system that transforms a cascading style sheet (“CSS”) codebase for a website, including:

• a processor and first memory, the first memory holding code that, when executed, causes the processor to:
• access in a second memory a CSS codebase that includes target tokens in customizable segments to be customized, responsive to an input invoking a module that uses the CSS codebase;
• select at least one set of customization functions among multiple alternative sets of customization functions that transform the target tokens within the customizable segments of the CSS codebase;
• scan the CSS codebase and locate the customizable segments of the CSS codebase that include the target tokens and at least a block of related key-value pairs, customization of the customizable segments of the CSS codebase being located based at least in part on an attribute of a user;
• parse, at runtime, only the located customizable segments of the CSS codebase to produce segment parse trees based on the parsed customizable segments;
• and
• transform the target tokens from the segment parse trees according to the selected set of customization functions and output a customized codebase to be used with the module invoked by the input.

A non-transitory computer readable storage medium impressed with computer program instructions to transform a cascading style sheet (“CSS”) codebase for a website, the instructions, when executed on a processor, implement a method comprising:

• accessing in a memory a CSS codebase that includes target tokens in customizable segments to be customized, responsive to an input invoking a module that uses the CSS codebase;
• selecting at least one set of customization functions among multiple alternative sets of customization functions that transform the target tokens within the customizable segments of the CSS codebase;
• scanning the CSS codebase and locating the customizable segments of the CSS codebase that include the target tokens and at least a block of related key-value pairs, customization of the customizable segments of the CSS codebase being located based at least in part on an attribute of a user;
• parsing, at runtime, only the located customizable segments of the CSS codebase to produce segment parse trees based on the parsed customizable segments;
• and
• transforming the target tokens from the segment parse trees according to the selected set of customization functions and outputting a customized codebase to be used with the module invoked by the input.