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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/jolie.js +1

@@ -0,0 +1 @@
1 Prism.languages.jolie=Prism.languages.extend("clike",{string:{pattern:/(^|[^\\])"(?:\\[\s\S]|[^"\\])*"/,lookbehind:!0,greedy:!0},"class-name":{pattern:/((?:\b(?:as|courier|embed|in|inputPort|outputPort|service)\b|@)[ \t]*)\w+/,lookbehind:!0},keyword:/\b(?:as|cH|comp|concurrent|constants|courier|cset|csets|default|define|else|embed|embedded|execution|exit|extender|for|foreach|forward|from|global|if|import|in|include|init|inputPort|install|instanceof|interface|is_defined|linkIn|linkOut|main|new|nullProcess|outputPort|over|private|provide|public|scope|sequential|service|single|spawn|synchronized|this|throw|throws|type|undef|until|while|with)\b/,function:/\b[a-z_]\w*(?=[ \t]*[@(])/i,number:/(?:\b\d+(?:\.\d*)?|\B\.\d+)(?:e[+-]?\d+)?l?/i,operator:/-[-=>]?|\+[+=]?|<[<=]?|[>=*!]=?|&&|\|\||[?\/%^@|]/,punctuation:/[()[\]{},;.:]/,builtin:/\b(?:Byte|any|bool|char|double|enum|float|int|length|long|ranges|regex|string|undefined|void)\b/}),Prism.languages.insertBefore("jolie","keyword",{aggregates:{pattern:/(\bAggregates\s*:\s*)(?:\w+(?:\s+with\s+\w+)?\s*,\s*)*\w+(?:\s+with\s+\w+)?/,lookbehind:!0,inside:{keyword:/\bwith\b/,"class-name":/\w+/,punctuation:/,/}},redirects:{pattern:/(\bRedirects\s*:\s*)(?:\w+\s*=>\s*\w+\s*,\s*)*(?:\w+\s*=>\s*\w+)/,lookbehind:!0,inside:{punctuation:/,/,"class-name":/\w+/,operator:/=>/}},property:{pattern:/\b(?:Aggregates|[Ii]nterfaces|Java|Javascript|Jolie|[Ll]ocation|OneWay|[Pp]rotocol|Redirects|RequestResponse)\b(?=[ \t]*:)/}});