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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/yaml.js +1

@@ -0,0 +1 @@
1 !function(e){var n=/[*&][^\s[\]{},]+/,r=/!(?:<[\w\-%#;/?:@&=+$,.!~*'()[\]]+>|(?:[a-zA-Z\d-]*!)?[\w\-%#;/?:@&=+$.~*'()]+)?/,t="(?:"+r.source+"(?:[ \t]+"+n.source+")?|"+n.source+"(?:[ \t]+"+r.source+")?)",a="(?:[^\\s\\x00-\\x08\\x0e-\\x1f!\"#%&'*,\\-:>?@[\\]`{|}\\x7f-\\x84\\x86-\\x9f\\ud800-\\udfff\\ufffe\\uffff]|[?:-]<PLAIN>)(?:[ \t]*(?:(?![#:])<PLAIN>|:<PLAIN>))*".replace(/<PLAIN>/g,(function(){return"[^\\s\\x00-\\x08\\x0e-\\x1f,[\\]{}\\x7f-\\x84\\x86-\\x9f\\ud800-\\udfff\\ufffe\\uffff]"})),d="\"(?:[^\"\\\\\r\n]|\\\\.)*\"|'(?:[^'\\\\\r\n]|\\\\.)*'";function o(e,n){n=(n||"").replace(/m/g,"")+"m";var r="([:\\-,[{]\\s*(?:\\s<<prop>>[ \t]+)?)(?:<<value>>)(?=[ \t]*(?:$|,|\\]|\\}|(?:[\r\n]\\s*)?#))".replace(/<<prop>>/g,(function(){return t})).replace(/<<value>>/g,(function(){return e}));return RegExp(r,n)}e.languages.yaml={scalar:{pattern:RegExp("([\\-:]\\s*(?:\\s<<prop>>[ \t]+)?[|>])[ \t]*(?:((?:\r?\n|\r)[ \t]+)\\S[^\r\n]*(?:\\2[^\r\n]+)*)".replace(/<<prop>>/g,(function(){return t}))),lookbehind:!0,alias:"string"},comment:/#.*/,key:{pattern:RegExp("((?:^|[:\\-,[{\r\n?])[ \t]*(?:<<prop>>[ \t]+)?)<<key>>(?=\\s*:\\s)".replace(/<<prop>>/g,(function(){return t})).replace(/<<key>>/g,(function(){return"(?:"+a+"|"+d+")"}))),lookbehind:!0,greedy:!0,alias:"atrule"},directive:{pattern:/(^[ \t]*)%.+/m,lookbehind:!0,alias:"important"},datetime:{pattern:o("\\d{4}-\\d\\d?-\\d\\d?(?:[tT]|[ \t]+)\\d\\d?:\\d{2}:\\d{2}(?:\\.\\d*)?(?:[ \t]*(?:Z|[-+]\\d\\d?(?::\\d{2})?))?|\\d{4}-\\d{2}-\\d{2}|\\d\\d?:\\d{2}(?::\\d{2}(?:\\.\\d*)?)?"),lookbehind:!0,alias:"number"},boolean:{pattern:o("false|true","i"),lookbehind:!0,alias:"important"},null:{pattern:o("null|~","i"),lookbehind:!0,alias:"important"},string:{pattern:o(d),lookbehind:!0,greedy:!0},number:{pattern:o("[+-]?(?:0x[\\da-f]+|0o[0-7]+|(?:\\d+(?:\\.\\d*)?|\\.\\d+)(?:e[+-]?\\d+)?|\\.inf|\\.nan)","i"),lookbehind:!0},tag:r,important:n,punctuation:/---|[:[\]{}\-,|>?]|\.\.\./},e.languages.yml=e.languages.yaml}(Prism);