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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/mermaid.js +1

@@ -0,0 +1 @@
1 Prism.languages.mermaid={comment:{pattern:/%%.*/,greedy:!0},style:{pattern:/^([ \t]*(?:classDef|linkStyle|style)[ \t]+[\w$-]+[ \t]+)\w.*[^\s;]/m,lookbehind:!0,inside:{property:/\b\w[\w-]*(?=[ \t]*:)/,operator:/:/,punctuation:/,/}},"inter-arrow-label":{pattern:/([^<>ox.=-])(?:-[-.]|==)(?![<>ox.=-])[ \t]*(?:"[^"\r\n]*"|[^\s".=-](?:[^\r\n.=-]*[^\s.=-])?)[ \t]*(?:\.+->?|--+[->]|==+[=>])(?![<>ox.=-])/,lookbehind:!0,greedy:!0,inside:{arrow:{pattern:/(?:\.+->?|--+[->]|==+[=>])$/,alias:"operator"},label:{pattern:/^([\s\S]{2}[ \t]*)\S(?:[\s\S]*\S)?/,lookbehind:!0,alias:"property"},"arrow-head":{pattern:/^\S+/,alias:["arrow","operator"]}}},arrow:[{pattern:/(^|[^{}|o.-])[|}][|o](?:--|\.\.)[|o][|{](?![{}|o.-])/,lookbehind:!0,alias:"operator"},{pattern:/(^|[^<>ox.=-])(?:[<ox](?:==+|--+|-\.*-)[>ox]?|(?:==+|--+|-\.*-)[>ox]|===+|---+|-\.+-)(?![<>ox.=-])/,lookbehind:!0,alias:"operator"},{pattern:/(^|[^<>()x-])(?:--?(?:>>|[x>)])(?![<>()x])|(?:<<|[x<(])--?(?!-))/,lookbehind:!0,alias:"operator"},{pattern:/(^|[^<>|*o.-])(?:[*o]--|--[*o]|<\|?(?:--|\.\.)|(?:--|\.\.)\|?>|--|\.\.)(?![<>|*o.-])/,lookbehind:!0,alias:"operator"}],label:{pattern:/(^|[^|<])\|(?:[^\r\n"|]|"[^"\r\n]*")+\|/,lookbehind:!0,greedy:!0,alias:"property"},text:{pattern:/(?:[(\[{]+|\b>)(?:[^\r\n"()\[\]{}]|"[^"\r\n]*")+(?:[)\]}]+|>)/,alias:"string"},string:{pattern:/"[^"\r\n]*"/,greedy:!0},annotation:{pattern:/<<(?:abstract|choice|enumeration|fork|interface|join|service)>>|\[\[(?:choice|fork|join)\]\]/i,alias:"important"},keyword:[{pattern:/(^[ \t]*)(?:action|callback|class|classDef|classDiagram|click|direction|erDiagram|flowchart|gantt|gitGraph|graph|journey|link|linkStyle|pie|requirementDiagram|sequenceDiagram|stateDiagram|stateDiagram-v2|style|subgraph)(?![\w$-])/m,lookbehind:!0,greedy:!0},{pattern:/(^[ \t]*)(?:activate|alt|and|as|autonumber|deactivate|else|end(?:[ \t]+note)?|loop|opt|par|participant|rect|state|note[ \t]+(?:over|(?:left|right)[ \t]+of))(?![\w$-])/im,lookbehind:!0,greedy:!0}],entity:/#[a-z0-9]+;/,operator:{pattern:/(\w[ \t]*)&(?=[ \t]*\w)|:::|:/,lookbehind:!0},punctuation:/[(){};]/};