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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/docker.js +1

@@ -0,0 +1 @@
1 !function(e){var n="(?:[ \t]+(?![ \t])(?:<SP_BS>)?|<SP_BS>)".replace(/<SP_BS>/g,(function(){return"\\\\[\r\n](?:\\s|\\\\[\r\n]|#.*(?!.))*(?![\\s#]|\\\\[\r\n])"})),r="\"(?:[^\"\\\\\r\n]|\\\\(?:\r\n|[^]))*\"|'(?:[^'\\\\\r\n]|\\\\(?:\r\n|[^]))*'",t="--[\\w-]+=(?:<STR>|(?![\"'])(?:[^\\s\\\\]|\\\\.)+)".replace(/<STR>/g,(function(){return r})),o={pattern:RegExp(r),greedy:!0},i={pattern:/(^[ \t]*)#.*/m,lookbehind:!0,greedy:!0};function a(e,r){return e=e.replace(/<OPT>/g,(function(){return t})).replace(/<SP>/g,(function(){return n})),RegExp(e,r)}e.languages.docker={instruction:{pattern:/(^[ \t]*)(?:ADD|ARG|CMD|COPY|ENTRYPOINT|ENV|EXPOSE|FROM|HEALTHCHECK|LABEL|MAINTAINER|ONBUILD|RUN|SHELL|STOPSIGNAL|USER|VOLUME|WORKDIR)(?=\s)(?:\\.|[^\r\n\\])*(?:\\$(?:\s|#.*$)*(?![\s#])(?:\\.|[^\r\n\\])*)*/im,lookbehind:!0,greedy:!0,inside:{options:{pattern:a("(^(?:ONBUILD<SP>)?\\w+<SP>)<OPT>(?:<SP><OPT>)*","i"),lookbehind:!0,greedy:!0,inside:{property:{pattern:/(^|\s)--[\w-]+/,lookbehind:!0},string:[o,{pattern:/(=)(?!["'])(?:[^\s\\]|\\.)+/,lookbehind:!0}],operator:/\\$/m,punctuation:/=/}},keyword:[{pattern:a("(^(?:ONBUILD<SP>)?HEALTHCHECK<SP>(?:<OPT><SP>)*)(?:CMD|NONE)\\b","i"),lookbehind:!0,greedy:!0},{pattern:a("(^(?:ONBUILD<SP>)?FROM<SP>(?:<OPT><SP>)*(?!--)[^ \t\\\\]+<SP>)AS","i"),lookbehind:!0,greedy:!0},{pattern:a("(^ONBUILD<SP>)\\w+","i"),lookbehind:!0,greedy:!0},{pattern:/^\w+/,greedy:!0}],comment:i,string:o,variable:/\$(?:\w+|\{[^{}"'\\]*\})/,operator:/\\$/m}},comment:i},e.languages.dockerfile=e.languages.docker}(Prism);