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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/bbj.js +1

@@ -0,0 +1 @@
1 !function(e){e.languages.bbj={comment:{pattern:/(^|[^\\:])rem\s+.*/i,lookbehind:!0,greedy:!0},string:{pattern:/(['"])(?:(?!\1|\\).|\\.)*\1/,greedy:!0},number:/(?:\b\d+(?:\.\d*)?|\B\.\d+)(?:E[+-]?\d+)?/i,keyword:/\b(?:abstract|all|argc|begin|bye|callback|case|chn|class|classend|ctl|day|declare|delete|dim|dom|dread|dsz|else|end|endif|err|exitto|extends|fi|field|for|from|gosub|goto|if|implements|interface|interfaceend|iol|iolist|let|list|load|method|methodend|methodret|on|opts|pfx|print|private|process_events|protected|psz|public|read|read_resource|release|remove_callback|repeat|restore|return|rev|seterr|setesc|sqlchn|sqlunt|ssn|start|static|swend|switch|sys|then|tim|unt|until|use|void|wend|where|while)\b/i,function:/\b\w+(?=\()/,boolean:/\b(?:BBjAPI\.TRUE|BBjAPI\.FALSE)\b/i,operator:/<[=>]?|>=?|[+\-*\/^=&]|\b(?:and|not|or|xor)\b/i,punctuation:/[.,;:()]/}}(Prism);