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Load a Prism grammar only when a blob names it

1b8675b19e70346d6d02d5fc0c10538f50bf94b2 · Keenan Nemetz · 9d ago · parent 11720250 

Load a Prism grammar only when a blob names it

The worker imported prism-languages.min.js — every grammar Prism ships — on
every code page. That is 546 KB to evaluate before the first token, and a page
showing one Go file paid it for all 293 components.

Each component is now vendored as its own file, and prism-manifest.js maps a
language name to the files that define it in dependency order. The worker
starts with Prism's core and the manifest and imports a language's files the
first time a job names it, remembering what it has run so a file is never
imported twice. A Go blob loads 30 KB instead of 564 KB; a .tsx blob, the
widest common entry at 8 files, loads 49 KB.

The manifest also carries the components that register no language of their
own but change one: css-extras, js-extras, js-templates, php-extras, xml-doc.
Each is placed after the grammar it rewrites and included in the entries that
inherit it, so a language that extends javascript now gets js-extras' arrow
and maybe-class-name tokens too. The old bundle's order handed those to some
inheriting languages and not others; nothing loses a token.

scripts/vendor-prism.py writes the grammars and the manifest, and --check
compares them byte for byte with cdnjs. TestPrismLanguagesAreVendored,
TestPrismGrammarsMatchTheManifest and TestPrismWorkerLoadsGrammarsOnDemand
hold the server's extension table, the vendored set and the worker's lazy
import together.

server/web/static/prism-languages/liquid.js +1

@@ -0,0 +1 @@
1 Prism.languages.liquid={comment:{pattern:/(^\{%\s*comment\s*%\})[\s\S]+(?=\{%\s*endcomment\s*%\}$)/,lookbehind:!0},delimiter:{pattern:/^\{(?:\{\{|[%\{])-?|-?(?:\}\}|[%\}])\}$/,alias:"punctuation"},string:{pattern:/"[^"]*"|'[^']*'/,greedy:!0},keyword:/\b(?:as|assign|break|(?:end)?(?:capture|case|comment|for|form|if|paginate|raw|style|tablerow|unless)|continue|cycle|decrement|echo|else|elsif|in|include|increment|limit|liquid|offset|range|render|reversed|section|when|with)\b/,object:/\b(?:address|all_country_option_tags|article|block|blog|cart|checkout|collection|color|country|country_option_tags|currency|current_page|current_tags|customer|customer_address|date|discount_allocation|discount_application|external_video|filter|filter_value|font|forloop|fulfillment|generic_file|gift_card|group|handle|image|line_item|link|linklist|localization|location|measurement|media|metafield|model|model_source|order|page|page_description|page_image|page_title|part|policy|product|product_option|recommendations|request|robots|routes|rule|script|search|selling_plan|selling_plan_allocation|selling_plan_group|shipping_method|shop|shop_locale|sitemap|store_availability|tax_line|template|theme|transaction|unit_price_measurement|user_agent|variant|video|video_source)\b/,function:[{pattern:/(\|\s*)\w+/,lookbehind:!0,alias:"filter"},{pattern:/(\.\s*)(?:first|last|size)/,lookbehind:!0}],boolean:/\b(?:false|nil|true)\b/,range:{pattern:/\.\./,alias:"operator"},number:/\b\d+(?:\.\d+)?\b/,operator:/[!=]=|<>|[<>]=?|[|?:=-]|\b(?:and|contains(?=\s)|or)\b/,punctuation:/[.,\[\]()]/,empty:{pattern:/\bempty\b/,alias:"keyword"}},Prism.hooks.add("before-tokenize",(function(e){var t=!1;Prism.languages["markup-templating"].buildPlaceholders(e,"liquid",/\{%\s*comment\s*%\}[\s\S]*?\{%\s*endcomment\s*%\}|\{(?:%[\s\S]*?%|\{\{[\s\S]*?\}\}|\{[\s\S]*?\})\}/g,(function(e){var n=/^\{%-?\s*(\w+)/.exec(e);if(n){var i=n[1];if("raw"===i&&!t)return t=!0,!0;if("endraw"===i)return t=!1,!0}return!t}))})),Prism.hooks.add("after-tokenize",(function(e){Prism.languages["markup-templating"].tokenizePlaceholders(e,"liquid")}));