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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/promql.js +1

@@ -0,0 +1 @@
1 !function(t){var n=["on","ignoring","group_right","group_left","by","without"],a=["sum","min","max","avg","group","stddev","stdvar","count","count_values","bottomk","topk","quantile"].concat(n,["offset"]);t.languages.promql={comment:{pattern:/(^[ \t]*)#.*/m,lookbehind:!0},"vector-match":{pattern:new RegExp("((?:"+n.join("|")+")\\s*)\\([^)]*\\)"),lookbehind:!0,inside:{"label-key":{pattern:/\b[^,]+\b/,alias:"attr-name"},punctuation:/[(),]/}},"context-labels":{pattern:/\{[^{}]*\}/,inside:{"label-key":{pattern:/\b[a-z_]\w*(?=\s*(?:=|![=~]))/,alias:"attr-name"},"label-value":{pattern:/(["'`])(?:\\[\s\S]|(?!\1)[^\\])*\1/,greedy:!0,alias:"attr-value"},punctuation:/\{|\}|=~?|![=~]|,/}},"context-range":[{pattern:/\[[\w\s:]+\]/,inside:{punctuation:/\[|\]|:/,"range-duration":{pattern:/\b(?:\d+(?:[smhdwy]|ms))+\b/i,alias:"number"}}},{pattern:/(\boffset\s+)\w+/,lookbehind:!0,inside:{"range-duration":{pattern:/\b(?:\d+(?:[smhdwy]|ms))+\b/i,alias:"number"}}}],keyword:new RegExp("\\b(?:"+a.join("|")+")\\b","i"),function:/\b[a-z_]\w*(?=\s*\()/i,number:/[-+]?(?:(?:\b\d+(?:\.\d+)?|\B\.\d+)(?:e[-+]?\d+)?\b|\b(?:0x[0-9a-f]+|nan|inf)\b)/i,operator:/[\^*/%+-]|==|!=|<=|<|>=|>|\b(?:and|or|unless)\b/i,punctuation:/[{};()`,.[\]]/}}(Prism);