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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/vala.js +1

@@ -0,0 +1 @@
		1	Prism.languages.vala=Prism.languages.extend("clike",{"class-name":[{pattern:/\b[A-Z]\w(?:\.\w+)\b(?=(?:\?\s+\|\?\s+\?)\w)/,inside:{punctuation:/\./}},{pattern:/(\[)[A-Z]\w(?:\.\w+)\b/,lookbehind:!0,inside:{punctuation:/\./}},{pattern:/(\b(?:class\|interface)\s+[A-Z]\w(?:\.\w+)\s:\s)[A-Z]\w(?:\.\w+)\b/,lookbehind:!0,inside:{punctuation:/\./}},{pattern:/((?:\b(?:class\|enum\|interface\|new\|struct)\s+)\|(?:catch\s+\())[A-Z]\w(?:\.\w+)\b/,lookbehind:!0,inside:{punctuation:/\./}}],keyword:/\b(?:abstract\|as\|assert\|async\|base\|bool\|break\|case\|catch\|char\|class\|const\|construct\|continue\|default\|delegate\|delete\|do\|double\|dynamic\|else\|ensures\|enum\|errordomain\|extern\|finally\|float\|for\|foreach\|get\|if\|in\|inline\|int\|int16\|int32\|int64\|int8\|interface\|internal\|is\|lock\|long\|namespace\|new\|null\|out\|override\|owned\|params\|private\|protected\|public\|ref\|requires\|return\|set\|short\|signal\|sizeof\|size_t\|ssize_t\|static\|string\|struct\|switch\|this\|throw\|throws\|try\|typeof\|uchar\|uint\|uint16\|uint32\|uint64\|uint8\|ulong\|unichar\|unowned\|ushort\|using\|value\|var\|virtual\|void\|volatile\|weak\|while\|yield)\b/i,function:/\b\w+(?=\s$)/,number:/(?:\b0x[\da-f]+\b\|(?:\b\d+(?:\.\d)?\|\B\.\d+)(?:e[+-]?\d+)?)(?:f\|u?l?)?/i,operator:/\+\+\|--\|&&\|\\|\\|\|<<=?\|>>=?\|=>\|->\|~\|[+\-\/%&^\|=!<>]=?\|\?\??\|\.\.\./,punctuation:/[{}[\];(),.:]/,constant:/\b[A-Z0-9_]+\b/}),Prism.languages.insertBefore("vala","string",{"raw-string":{pattern:/"""[\s\S]?"""/,greedy:!0,alias:"string"},"template-string":{pattern:/@"[\s\S]?"/,greedy:!0,inside:{interpolation:{pattern:/\$(?:\([^)]$\|[a-zA-Z]\w)/,inside:{delimiter:{pattern:/^\$$?\|$$/,alias:"punctuation"},rest:Prism.languages.vala}},string:/[\s\S]+/}}}),Prism.languages.insertBefore("vala","keyword",{regex:{pattern:/\/(?:\[(?:[^\]\\\r\n]\|\\.)\]\|\\.\|[^/\\\[\r\n])+\/[imsx]{0,4}(?=\s(?:$\|[\r\n,.;})\]]))/,greedy:!0,inside:{"regex-source":{pattern:/^(\/)[\s\S]+(?=\/[a-z]$)/,lookbehind:!0,alias:"language-regex",inside:Prism.languages.regex},"regex-delimiter":/^\//,"regex-flags":/^[a-z]+$/}}});

@@ -0,0 +1 @@
		1	Prism.languages.vala=Prism.languages.extend("clike",{"class-name":[{pattern:/\b[A-Z]\w(?:\.\w+)\b(?=(?:\?\s+\|\?\s+\?)\w)/,inside:{punctuation:/\./}},{pattern:/(\[)[A-Z]\w(?:\.\w+)\b/,lookbehind:!0,inside:{punctuation:/\./}},{pattern:/(\b(?:class\|interface)\s+[A-Z]\w(?:\.\w+)\s:\s)[A-Z]\w(?:\.\w+)\b/,lookbehind:!0,inside:{punctuation:/\./}},{pattern:/((?:\b(?:class\|enum\|interface\|new\|struct)\s+)\|(?:catch\s+\())[A-Z]\w(?:\.\w+)\b/,lookbehind:!0,inside:{punctuation:/\./}}],keyword:/\b(?:abstract\|as\|assert\|async\|base\|bool\|break\|case\|catch\|char\|class\|const\|construct\|continue\|default\|delegate\|delete\|do\|double\|dynamic\|else\|ensures\|enum\|errordomain\|extern\|finally\|float\|for\|foreach\|get\|if\|in\|inline\|int\|int16\|int32\|int64\|int8\|interface\|internal\|is\|lock\|long\|namespace\|new\|null\|out\|override\|owned\|params\|private\|protected\|public\|ref\|requires\|return\|set\|short\|signal\|sizeof\|size_t\|ssize_t\|static\|string\|struct\|switch\|this\|throw\|throws\|try\|typeof\|uchar\|uint\|uint16\|uint32\|uint64\|uint8\|ulong\|unichar\|unowned\|ushort\|using\|value\|var\|virtual\|void\|volatile\|weak\|while\|yield)\b/i,function:/\b\w+(?=\s\()/,number:/(?:\b0x[\da-f]+\b\|(?:\b\d+(?:\.\d)?\|\B\.\d+)(?:e[+-]?\d+)?)(?:f\|u?l?)?/i,operator:/\+\+\|--\|&&\|\\|\\|\|<<=?\|>>=?\|=>\|->\|~\|[+\-\/%&^\|=!<>]=?\|\?\??\|\.\.\./,punctuation:/[{}[\];(),.:]/,constant:/\b[A-Z0-9_]+\b/}),Prism.languages.insertBefore("vala","string",{"raw-string":{pattern:/"""[\s\S]?"""/,greedy:!0,alias:"string"},"template-string":{pattern:/@"[\s\S]?"/,greedy:!0,inside:{interpolation:{pattern:/\$(?:\([^)]\)\|[a-zA-Z]\w)/,inside:{delimiter:{pattern:/^\$\(?\|\)$/,alias:"punctuation"},rest:Prism.languages.vala}},string:/[\s\S]+/}}}),Prism.languages.insertBefore("vala","keyword",{regex:{pattern:/\/(?:\[(?:[^\]\\\r\n]\|\\.)\]\|\\.\|[^/\\\[\r\n])+\/[imsx]{0,4}(?=\s(?:$\|[\r\n,.;})\]]))/,greedy:!0,inside:{"regex-source":{pattern:/^(\/)[\s\S]+(?=\/[a-z]$)/,lookbehind:!0,alias:"language-regex",inside:Prism.languages.regex},"regex-delimiter":/^\//,"regex-flags":/^[a-z]+$/}}});