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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/fortran.js +1

@@ -0,0 +1 @@
1 Prism.languages.fortran={"quoted-number":{pattern:/[BOZ](['"])[A-F0-9]+\1/i,alias:"number"},string:{pattern:/(?:\b\w+_)?(['"])(?:\1\1|&(?:\r\n?|\n)(?:[ \t]*!.*(?:\r\n?|\n)|(?![ \t]*!))|(?!\1).)*(?:\1|&)/,inside:{comment:{pattern:/(&(?:\r\n?|\n)\s*)!.*/,lookbehind:!0}}},comment:{pattern:/!.*/,greedy:!0},boolean:/\.(?:FALSE|TRUE)\.(?:_\w+)?/i,number:/(?:\b\d+(?:\.\d*)?|\B\.\d+)(?:[ED][+-]?\d+)?(?:_\w+)?/i,keyword:[/\b(?:CHARACTER|COMPLEX|DOUBLE ?PRECISION|INTEGER|LOGICAL|REAL)\b/i,/\b(?:END ?)?(?:BLOCK ?DATA|DO|FILE|FORALL|FUNCTION|IF|INTERFACE|MODULE(?! PROCEDURE)|PROGRAM|SELECT|SUBROUTINE|TYPE|WHERE)\b/i,/\b(?:ALLOCATABLE|ALLOCATE|BACKSPACE|CALL|CASE|CLOSE|COMMON|CONTAINS|CONTINUE|CYCLE|DATA|DEALLOCATE|DIMENSION|DO|END|EQUIVALENCE|EXIT|EXTERNAL|FORMAT|GO ?TO|IMPLICIT(?: NONE)?|INQUIRE|INTENT|INTRINSIC|MODULE PROCEDURE|NAMELIST|NULLIFY|OPEN|OPTIONAL|PARAMETER|POINTER|PRINT|PRIVATE|PUBLIC|READ|RETURN|REWIND|SAVE|SELECT|STOP|TARGET|WHILE|WRITE)\b/i,/\b(?:ASSIGNMENT|DEFAULT|ELEMENTAL|ELSE|ELSEIF|ELSEWHERE|ENTRY|IN|INCLUDE|INOUT|KIND|NULL|ONLY|OPERATOR|OUT|PURE|RECURSIVE|RESULT|SEQUENCE|STAT|THEN|USE)\b/i],operator:[/\*\*|\/\/|=>|[=\/]=|[<>]=?|::|[+\-*=%]|\.[A-Z]+\./i,{pattern:/(^|(?!\().)\/(?!\))/,lookbehind:!0}],punctuation:/\(\/|\/\)|[(),;:&]/};