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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/tremor.js +1

@@ -0,0 +1 @@
1 !function(e){e.languages.tremor={comment:{pattern:/(^|[^\\])(?:\/\*[\s\S]*?\*\/|(?:--|\/\/|#).*)/,lookbehind:!0},"interpolated-string":null,extractor:{pattern:/\b[a-z_]\w*\|(?:[^\r\n\\|]|\\(?:\r\n|[\s\S]))*\|/i,greedy:!0,inside:{regex:{pattern:/(^re)\|[\s\S]+/,lookbehind:!0},function:/^\w+/,value:/\|[\s\S]+/}},identifier:{pattern:/`[^`]*`/,greedy:!0},function:/\b[a-z_]\w*(?=\s*(?:::\s*<|\())\b/,keyword:/\b(?:args|as|by|case|config|connect|connector|const|copy|create|default|define|deploy|drop|each|emit|end|erase|event|flow|fn|for|from|group|having|insert|into|intrinsic|let|links|match|merge|mod|move|of|operator|patch|pipeline|recur|script|select|set|sliding|state|stream|to|tumbling|update|use|when|where|window|with)\b/,boolean:/\b(?:false|null|true)\b/i,number:/\b(?:0b[01_]*|0x[0-9a-fA-F_]*|\d[\d_]*(?:\.\d[\d_]*)?(?:[Ee][+-]?[\d_]+)?)\b/,"pattern-punctuation":{pattern:/%(?=[({[])/,alias:"punctuation"},operator:/[-+*\/%~!^]=?|=[=>]?|&[&=]?|\|[|=]?|<<?=?|>>?>?=?|(?:absent|and|not|or|present|xor)\b/,punctuation:/::|[;\[\]()\{\},.:]/};var n='#\\{(?:[^"{}]|\\{[^{}]*\\}|"(?:[^"\\\\\r\n]|\\\\(?:\r\n|[^]))*")*\\}';e.languages.tremor["interpolated-string"]={pattern:RegExp('(^|[^\\\\])(?:"""(?:[^"\\\\#]|\\\\[^]|"(?!"")|#(?!\\{)|'+n+')*"""|"(?:[^"\\\\\r\n#]|\\\\(?:\r\n|[^])|#(?!\\{)|'+n+')*")'),lookbehind:!0,greedy:!0,inside:{interpolation:{pattern:RegExp(n),inside:{punctuation:/^#\{|\}$/,expression:{pattern:/[\s\S]+/,inside:e.languages.tremor}}},string:/[\s\S]+/}},e.languages.troy=e.languages.tremor,e.languages.trickle=e.languages.tremor}(Prism);