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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/smarty.js +1

@@ -0,0 +1 @@
1 !function(e){e.languages.smarty={comment:{pattern:/^\{\*[\s\S]*?\*\}/,greedy:!0},"embedded-php":{pattern:/^\{php\}[\s\S]*?\{\/php\}/,greedy:!0,inside:{smarty:{pattern:/^\{php\}|\{\/php\}$/,inside:null},php:{pattern:/[\s\S]+/,alias:"language-php",inside:e.languages.php}}},string:[{pattern:/"(?:\\.|[^"\\\r\n])*"/,greedy:!0,inside:{interpolation:{pattern:/\{[^{}]*\}|`[^`]*`/,inside:{"interpolation-punctuation":{pattern:/^[{`]|[`}]$/,alias:"punctuation"},expression:{pattern:/[\s\S]+/,inside:null}}},variable:/\$\w+/}},{pattern:/'(?:\\.|[^'\\\r\n])*'/,greedy:!0}],keyword:{pattern:/(^\{\/?)[a-z_]\w*\b(?!\()/i,lookbehind:!0,greedy:!0},delimiter:{pattern:/^\{\/?|\}$/,greedy:!0,alias:"punctuation"},number:/\b0x[\dA-Fa-f]+|(?:\b\d+(?:\.\d*)?|\B\.\d+)(?:[Ee][-+]?\d+)?/,variable:[/\$(?!\d)\w+/,/#(?!\d)\w+#/,{pattern:/(\.|->|\w\s*=)(?!\d)\w+\b(?!\()/,lookbehind:!0},{pattern:/(\[)(?!\d)\w+(?=\])/,lookbehind:!0}],function:{pattern:/(\|\s*)@?[a-z_]\w*|\b[a-z_]\w*(?=\()/i,lookbehind:!0},"attr-name":/\b[a-z_]\w*(?=\s*=)/i,boolean:/\b(?:false|no|off|on|true|yes)\b/,punctuation:/[\[\](){}.,:`]|->/,operator:[/[+\-*\/%]|==?=?|[!<>]=?|&&|\|\|?/,/\bis\s+(?:not\s+)?(?:div|even|odd)(?:\s+by)?\b/,/\b(?:and|eq|gt?e|gt|lt?e|lt|mod|neq?|not|or)\b/]},e.languages.smarty["embedded-php"].inside.smarty.inside=e.languages.smarty,e.languages.smarty.string[0].inside.interpolation.inside.expression.inside=e.languages.smarty;var n=/"(?:\\.|[^"\\\r\n])*"|'(?:\\.|[^'\\\r\n])*'/,t=RegExp("\\{\\*[^]*?\\*\\}|\\{php\\}[^]*?\\{/php\\}|"+"\\{(?:[^{}\"']|<str>|\\{(?:[^{}\"']|<str>|\\{(?:[^{}\"']|<str>)*\\})*\\})*\\}".replace(/<str>/g,(function(){return n.source})),"g");e.hooks.add("before-tokenize",(function(n){var a=!1;e.languages["markup-templating"].buildPlaceholders(n,"smarty",t,(function(e){return"{/literal}"===e&&(a=!1),!a&&("{literal}"===e&&(a=!0),!0)}))})),e.hooks.add("after-tokenize",(function(n){e.languages["markup-templating"].tokenizePlaceholders(n,"smarty")}))}(Prism);