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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/rescript.js +1

@@ -0,0 +1 @@
1 Prism.languages.rescript={comment:{pattern:/\/\/.*|\/\*[\s\S]*?(?:\*\/|$)/,greedy:!0},char:{pattern:/'(?:[^\r\n\\]|\\(?:.|\w+))'/,greedy:!0},string:{pattern:/"(?:\\(?:\r\n|[\s\S])|[^\\\r\n"])*"/,greedy:!0},"class-name":/\b[A-Z]\w*|@[a-z.]*|#[A-Za-z]\w*|#\d/,function:{pattern:/[a-zA-Z]\w*(?=\()|(\.)[a-z]\w*/,lookbehind:!0},number:/(?:\b0x(?:[\da-f]+(?:\.[\da-f]*)?|\.[\da-f]+)(?:p[+-]?\d+)?|(?:\b\d+(?:\.\d*)?|\B\.\d+)(?:e[+-]?\d+)?)[ful]{0,4}/i,boolean:/\b(?:false|true)\b/,"attr-value":/[A-Za-z]\w*(?==)/,constant:{pattern:/(\btype\s+)[a-z]\w*/,lookbehind:!0},tag:{pattern:/(<)[a-z]\w*|(?:<\/)[a-z]\w*/,lookbehind:!0,inside:{operator:/<|>|\//}},keyword:/\b(?:and|as|assert|begin|bool|class|constraint|do|done|downto|else|end|exception|external|float|for|fun|function|if|in|include|inherit|initializer|int|lazy|let|method|module|mutable|new|nonrec|object|of|open|or|private|rec|string|switch|then|to|try|type|when|while|with)\b/,operator:/\.{3}|:[:=]?|\|>|->|=(?:==?|>)?|<=?|>=?|[|^?'#!~`]|[+\-*\/]\.?|\b(?:asr|land|lor|lsl|lsr|lxor|mod)\b/,punctuation:/[(){}[\],;.]/},Prism.languages.insertBefore("rescript","string",{"template-string":{pattern:/`(?:\\[\s\S]|\$\{(?:[^{}]|\{(?:[^{}]|\{[^}]*\})*\})+\}|(?!\$\{)[^\\`])*`/,greedy:!0,inside:{"template-punctuation":{pattern:/^`|`$/,alias:"string"},interpolation:{pattern:/((?:^|[^\\])(?:\\{2})*)\$\{(?:[^{}]|\{(?:[^{}]|\{[^}]*\})*\})+\}/,lookbehind:!0,inside:{"interpolation-punctuation":{pattern:/^\$\{|\}$/,alias:"tag"},rest:Prism.languages.rescript}},string:/[\s\S]+/}}}),Prism.languages.res=Prism.languages.rescript;