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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/stan.js +1

@@ -0,0 +1 @@
1 !function(e){var r=/\b(?:algebra_solver|algebra_solver_newton|integrate_1d|integrate_ode|integrate_ode_bdf|integrate_ode_rk45|map_rect|ode_(?:adams|bdf|ckrk|rk45)(?:_tol)?|ode_adjoint_tol_ctl|reduce_sum|reduce_sum_static)\b/;e.languages.stan={comment:/\/\/.*|\/\*[\s\S]*?\*\/|#(?!include).*/,string:{pattern:/"[\x20\x21\x23-\x5B\x5D-\x7E]*"/,greedy:!0},directive:{pattern:/^([ \t]*)#include\b.*/m,lookbehind:!0,alias:"property"},"function-arg":{pattern:RegExp("("+r.source+"\\s*\\(\\s*)[a-zA-Z]\\w*"),lookbehind:!0,alias:"function"},constraint:{pattern:/(\b(?:int|matrix|real|row_vector|vector)\s*)<[^<>]*>/,lookbehind:!0,inside:{expression:{pattern:/(=\s*)\S(?:\S|\s+(?!\s))*?(?=\s*(?:>$|,\s*\w+\s*=))/,lookbehind:!0,inside:null},property:/\b[a-z]\w*(?=\s*=)/i,operator:/=/,punctuation:/^<|>$|,/}},keyword:[{pattern:/\bdata(?=\s*\{)|\b(?:functions|generated|model|parameters|quantities|transformed)\b/,alias:"program-block"},/\b(?:array|break|cholesky_factor_corr|cholesky_factor_cov|complex|continue|corr_matrix|cov_matrix|data|else|for|if|in|increment_log_prob|int|matrix|ordered|positive_ordered|print|real|reject|return|row_vector|simplex|target|unit_vector|vector|void|while)\b/,r],function:/\b[a-z]\w*(?=\s*\()/i,number:/(?:\b\d+(?:_\d+)*(?:\.(?:\d+(?:_\d+)*)?)?|\B\.\d+(?:_\d+)*)(?:E[+-]?\d+(?:_\d+)*)?i?(?!\w)/i,boolean:/\b(?:false|true)\b/,operator:/<-|\.[*/]=?|\|\|?|&&|[!=<>+\-*/]=?|['^%~?:]/,punctuation:/[()\[\]{},;]/},e.languages.stan.constraint.inside.expression.inside=e.languages.stan}(Prism);