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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/armasm.js +1

@@ -0,0 +1 @@
		1	Prism.languages.armasm={comment:{pattern:/;./,greedy:!0},string:{pattern:/"(?:[^"\r\n]\|"")"/,greedy:!0,inside:{variable:{pattern:/((?:^\|[^$])(?:\${2}))\$\w+/,lookbehind:!0}}},char:{pattern:/'(?:[^'\r\n]{0,4}\|'')'/,greedy:!0},"version-symbol":{pattern:/\\|[\w@]+\\|/,greedy:!0,alias:"property"},boolean:/\b(?:FALSE\|TRUE)\b/,directive:{pattern:/\b(?:ALIAS\|ALIGN\|AREA\|ARM\|ASSERT\|ATTR\|CN\|CODE\|CODE16\|CODE32\|COMMON\|CP\|DATA\|DCB\|DCD\|DCDO\|DCDU\|DCFD\|DCFDU\|DCI\|DCQ\|DCQU\|DCW\|DCWU\|DN\|ELIF\|ELSE\|END\|ENDFUNC\|ENDIF\|ENDP\|ENTRY\|EQU\|EXPORT\|EXPORTAS\|EXTERN\|FIELD\|FILL\|FN\|FUNCTION\|GBLA\|GBLL\|GBLS\|GET\|GLOBAL\|IF\|IMPORT\|INCBIN\|INCLUDE\|INFO\|KEEP\|LCLA\|LCLL\|LCLS\|LTORG\|MACRO\|MAP\|MEND\|MEXIT\|NOFP\|OPT\|PRESERVE8\|PROC\|QN\|READONLY\|RELOC\|REQUIRE\|REQUIRE8\|RLIST\|ROUT\|SETA\|SETL\|SETS\|SN\|SPACE\|SUBT\|THUMB\|THUMBX\|TTL\|WEND\|WHILE)\b/,alias:"property"},instruction:{pattern:/((?:^\|(?:^\|[^\\])(?:\r\n?\|\n))[ \t](?:(?:[A-Z][A-Z0-9_][a-z]\w\|[a-z]\w\|\d+)[ \t]+)?)\b[A-Z.]+\b/,lookbehind:!0,alias:"keyword"},variable:/\$\w+/,number:/(?:\b[2-9]_\d+\|(?:\b\d+(?:\.\d+)?\|\B\.\d+)(?:e-?\d+)?\|\b0(?:[fd]_\|x)[0-9a-f]+\|&[0-9a-f]+)\b/i,register:{pattern:/\b(?:r\d\|lr)\b/,alias:"symbol"},operator:/<>\|<<\|>>\|&&\|\\|\\|\|[=!<>/]=?\|[+\-%#?&\|^]\|:[A-Z]+:/,punctuation:/[()[\],]/},Prism.languages["arm-asm"]=Prism.languages.armasm;