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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/puppet.js +1

@@ -0,0 +1 @@
1 !function(e){e.languages.puppet={heredoc:[{pattern:/(@\("([^"\r\n\/):]+)"(?:\/[nrts$uL]*)?\).*(?:\r?\n|\r))(?:.*(?:\r?\n|\r(?!\n)))*?[ \t]*(?:\|[ \t]*)?(?:-[ \t]*)?\2/,lookbehind:!0,alias:"string",inside:{punctuation:/(?=\S).*\S(?= *$)/}},{pattern:/(@\(([^"\r\n\/):]+)(?:\/[nrts$uL]*)?\).*(?:\r?\n|\r))(?:.*(?:\r?\n|\r(?!\n)))*?[ \t]*(?:\|[ \t]*)?(?:-[ \t]*)?\2/,lookbehind:!0,greedy:!0,alias:"string",inside:{punctuation:/(?=\S).*\S(?= *$)/}},{pattern:/@\("?(?:[^"\r\n\/):]+)"?(?:\/[nrts$uL]*)?\)/,alias:"string",inside:{punctuation:{pattern:/(\().+?(?=\))/,lookbehind:!0}}}],"multiline-comment":{pattern:/(^|[^\\])\/\*[\s\S]*?\*\//,lookbehind:!0,greedy:!0,alias:"comment"},regex:{pattern:/((?:\bnode\s+|[~=\(\[\{,]\s*|[=+]>\s*|^\s*))\/(?:[^\/\\]|\\[\s\S])+\/(?:[imx]+\b|\B)/,lookbehind:!0,greedy:!0,inside:{"extended-regex":{pattern:/^\/(?:[^\/\\]|\\[\s\S])+\/[im]*x[im]*$/,inside:{comment:/#.*/}}}},comment:{pattern:/(^|[^\\])#.*/,lookbehind:!0,greedy:!0},string:{pattern:/(["'])(?:\$\{(?:[^'"}]|(["'])(?:(?!\2)[^\\]|\\[\s\S])*\2)+\}|\$(?!\{)|(?!\1)[^\\$]|\\[\s\S])*\1/,greedy:!0,inside:{"double-quoted":{pattern:/^"[\s\S]*"$/,inside:{}}}},variable:{pattern:/\$(?:::)?\w+(?:::\w+)*/,inside:{punctuation:/::/}},"attr-name":/(?:\b\w+|\*)(?=\s*=>)/,function:[{pattern:/(\.)(?!\d)\w+/,lookbehind:!0},/\b(?:contain|debug|err|fail|include|info|notice|realize|require|tag|warning)\b|\b(?!\d)\w+(?=\()/],number:/\b(?:0x[a-f\d]+|\d+(?:\.\d+)?(?:e-?\d+)?)\b/i,boolean:/\b(?:false|true)\b/,keyword:/\b(?:application|attr|case|class|consumes|default|define|else|elsif|function|if|import|inherits|node|private|produces|type|undef|unless)\b/,datatype:{pattern:/\b(?:Any|Array|Boolean|Callable|Catalogentry|Class|Collection|Data|Default|Enum|Float|Hash|Integer|NotUndef|Numeric|Optional|Pattern|Regexp|Resource|Runtime|Scalar|String|Struct|Tuple|Type|Undef|Variant)\b/,alias:"symbol"},operator:/=[=~>]?|![=~]?|<(?:<\|?|[=~|-])?|>[>=]?|->?|~>|\|>?>?|[*\/%+?]|\b(?:and|in|or)\b/,punctuation:/[\[\]{}().,;]|:+/};var n=[{pattern:/(^|[^\\])\$\{(?:[^'"{}]|\{[^}]*\}|(["'])(?:(?!\2)[^\\]|\\[\s\S])*\2)+\}/,lookbehind:!0,inside:{"short-variable":{pattern:/(^\$\{)(?!\w+\()(?:::)?\w+(?:::\w+)*/,lookbehind:!0,alias:"variable",inside:{punctuation:/::/}},delimiter:{pattern:/^\$/,alias:"variable"},rest:e.languages.puppet}},{pattern:/(^|[^\\])\$(?:::)?\w+(?:::\w+)*/,lookbehind:!0,alias:"variable",inside:{punctuation:/::/}}];e.languages.puppet.heredoc[0].inside.interpolation=n,e.languages.puppet.string.inside["double-quoted"].inside.interpolation=n}(Prism);