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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/log.js +1

@@ -0,0 +1 @@
1 Prism.languages.log={string:{pattern:/"(?:[^"\\\r\n]|\\.)*"|'(?![st] | \w)(?:[^'\\\r\n]|\\.)*'/,greedy:!0},exception:{pattern:/(^|[^\w.])[a-z][\w.]*(?:Error|Exception):.*(?:(?:\r\n?|\n)[ \t]*(?:at[ \t].+|\.{3}.*|Caused by:.*))+(?:(?:\r\n?|\n)[ \t]*\.\.\. .*)?/,lookbehind:!0,greedy:!0,alias:["javastacktrace","language-javastacktrace"],inside:Prism.languages.javastacktrace||{keyword:/\bat\b/,function:/[a-z_][\w$]*(?=\()/,punctuation:/[.:()]/}},level:[{pattern:/\b(?:ALERT|CRIT|CRITICAL|EMERG|EMERGENCY|ERR|ERROR|FAILURE|FATAL|SEVERE)\b/,alias:["error","important"]},{pattern:/\b(?:WARN|WARNING|WRN)\b/,alias:["warning","important"]},{pattern:/\b(?:DISPLAY|INF|INFO|NOTICE|STATUS)\b/,alias:["info","keyword"]},{pattern:/\b(?:DBG|DEBUG|FINE)\b/,alias:["debug","keyword"]},{pattern:/\b(?:FINER|FINEST|TRACE|TRC|VERBOSE|VRB)\b/,alias:["trace","comment"]}],property:{pattern:/((?:^|[\]|])[ \t]*)[a-z_](?:[\w-]|\b\/\b)*(?:[. ]\(?\w(?:[\w-]|\b\/\b)*\)?)*:(?=\s)/im,lookbehind:!0},separator:{pattern:/(^|[^-+])-{3,}|={3,}|\*{3,}|- - /m,lookbehind:!0,alias:"comment"},url:/\b(?:file|ftp|https?):\/\/[^\s|,;'"]*[^\s|,;'">.]/,email:{pattern:/(^|\s)[-\w+.]+@[a-z][a-z0-9-]*(?:\.[a-z][a-z0-9-]*)+(?=\s)/,lookbehind:!0,alias:"url"},"ip-address":{pattern:/\b(?:\d{1,3}(?:\.\d{1,3}){3})\b/,alias:"constant"},"mac-address":{pattern:/\b[a-f0-9]{2}(?::[a-f0-9]{2}){5}\b/i,alias:"constant"},domain:{pattern:/(^|\s)[a-z][a-z0-9-]*(?:\.[a-z][a-z0-9-]*)*\.[a-z][a-z0-9-]+(?=\s)/,lookbehind:!0,alias:"constant"},uuid:{pattern:/\b[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}\b/i,alias:"constant"},hash:{pattern:/\b(?:[a-f0-9]{32}){1,2}\b/i,alias:"constant"},"file-path":{pattern:/\b[a-z]:[\\/][^\s|,;:(){}\[\]"']+|(^|[\s:\[\](>|])\.{0,2}\/\w[^\s|,;:(){}\[\]"']*/i,lookbehind:!0,greedy:!0,alias:"string"},date:{pattern:RegExp("\\b\\d{4}[-/]\\d{2}[-/]\\d{2}(?:T(?=\\d{1,2}:)|(?=\\s\\d{1,2}:))|\\b\\d{1,4}[-/ ](?:\\d{1,2}|Apr|Aug|Dec|Feb|Jan|Jul|Jun|Mar|May|Nov|Oct|Sep)[-/ ]\\d{2,4}T?\\b|\\b(?:(?:Fri|Mon|Sat|Sun|Thu|Tue|Wed)(?:\\s{1,2}(?:Apr|Aug|Dec|Feb|Jan|Jul|Jun|Mar|May|Nov|Oct|Sep))?|Apr|Aug|Dec|Feb|Jan|Jul|Jun|Mar|May|Nov|Oct|Sep)\\s{1,2}\\d{1,2}\\b","i"),alias:"number"},time:{pattern:/\b\d{1,2}:\d{1,2}:\d{1,2}(?:[.,:]\d+)?(?:\s?[+-]\d{2}:?\d{2}|Z)?\b/,alias:"number"},boolean:/\b(?:false|null|true)\b/i,number:{pattern:/(^|[^.\w])(?:0x[a-f0-9]+|0o[0-7]+|0b[01]+|v?\d[\da-f]*(?:\.\d+)*(?:e[+-]?\d+)?[a-z]{0,3}\b)\b(?!\.\w)/i,lookbehind:!0},operator:/[;:?<=>~/@!$%&+\-|^(){}*#]/,punctuation:/[\[\].,]/};