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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/keyman.js +1

@@ -0,0 +1 @@
1 Prism.languages.keyman={comment:{pattern:/\bc .*/i,greedy:!0},string:{pattern:/"[^"\r\n]*"|'[^'\r\n]*'/,greedy:!0},"virtual-key":{pattern:/\[\s*(?:(?:ALT|CAPS|CTRL|LALT|LCTRL|NCAPS|RALT|RCTRL|SHIFT)\s+)*(?:[TKU]_[\w?]+|[A-E]\d\d?|"[^"\r\n]*"|'[^'\r\n]*')\s*\]/i,greedy:!0,alias:"function"},"header-keyword":{pattern:/&\w+/,alias:"bold"},"header-statement":{pattern:/\b(?:bitmap|bitmaps|caps always off|caps on only|copyright|hotkey|language|layout|message|name|shift frees caps|version)\b/i,alias:"bold"},"rule-keyword":{pattern:/\b(?:any|baselayout|beep|call|context|deadkey|dk|if|index|layer|notany|nul|outs|platform|reset|return|save|set|store|use)\b/i,alias:"keyword"},"structural-keyword":{pattern:/\b(?:ansi|begin|group|match|newcontext|nomatch|postkeystroke|readonly|unicode|using keys)\b/i,alias:"keyword"},"compile-target":{pattern:/\$(?:keyman|keymanonly|keymanweb|kmfl|weaver):/i,alias:"property"},number:/\b(?:U\+[\dA-F]+|d\d+|x[\da-f]+|\d+)\b/i,operator:/[+>\\$]|\.\./,punctuation:/[()=,]/};