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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/magma.js +1

@@ -0,0 +1 @@
1 Prism.languages.magma={output:{pattern:/^(>.*(?:\r(?:\n|(?!\n))|\n))(?!>)(?:.+|(?:\r(?:\n|(?!\n))|\n)(?!>).*)(?:(?:\r(?:\n|(?!\n))|\n)(?!>).*)*/m,lookbehind:!0,greedy:!0},comment:{pattern:/\/\/.*|\/\*[\s\S]*?\*\//,greedy:!0},string:{pattern:/(^|[^\\"])"(?:[^\r\n\\"]|\\.)*"/,lookbehind:!0,greedy:!0},keyword:/\b(?:_|adj|and|assert|assert2|assert3|assigned|break|by|case|cat|catch|clear|cmpeq|cmpne|continue|declare|default|delete|diff|div|do|elif|else|end|eq|error|eval|exists|exit|for|forall|forward|fprintf|freeze|function|ge|gt|if|iload|import|in|intrinsic|is|join|le|load|local|lt|meet|mod|ne|not|notadj|notin|notsubset|or|print|printf|procedure|quit|random|read|readi|repeat|require|requirege|requirerange|restore|return|save|sdiff|select|subset|then|time|to|try|until|vprint|vprintf|vtime|when|where|while|xor)\b/,boolean:/\b(?:false|true)\b/,generator:{pattern:/\b[a-z_]\w*(?=\s*<)/i,alias:"class-name"},function:/\b[a-z_]\w*(?=\s*\()/i,number:{pattern:/(^|[^\w.]|\.\.)(?:\d+(?:\.\d*)?|\.\d+)(?:[eE][+-]?\d+)?(?:_[a-z]?)?(?=$|[^\w.]|\.\.)/,lookbehind:!0},operator:/->|[-+*/^~!|#=]|:=|\.\./,punctuation:/[()[\]{}<>,;.:]/};