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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/vbnet.js +1

@@ -0,0 +1 @@
		1	Prism.languages.vbnet=Prism.languages.extend("basic",{comment:[{pattern:/(?:!\|REM\b).+/i,inside:{keyword:/^REM/i}},{pattern:/(^\|[^\\:])'./,lookbehind:!0,greedy:!0}],string:{pattern:/(^\|[^"])"(?:""\|[^"])"(?!")/,lookbehind:!0,greedy:!0},keyword:/(?:\b(?:ADDHANDLER\|ADDRESSOF\|ALIAS\|AND\|ANDALSO\|AS\|BEEP\|BLOAD\|BOOLEAN\|BSAVE\|BYREF\|BYTE\|BYVAL\|CALL(?: ABSOLUTE)?\|CASE\|CATCH\|CBOOL\|CBYTE\|CCHAR\|CDATE\|CDBL\|CDEC\|CHAIN\|CHAR\|CHDIR\|CINT\|CLASS\|CLEAR\|CLNG\|CLOSE\|CLS\|COBJ\|COM\|COMMON\|CONST\|CONTINUE\|CSBYTE\|CSHORT\|CSNG\|CSTR\|CTYPE\|CUINT\|CULNG\|CUSHORT\|DATA\|DATE\|DECIMAL\|DECLARE\|DEF(?: FN\| SEG\|DBL\|INT\|LNG\|SNG\|STR)\|DEFAULT\|DELEGATE\|DIM\|DIRECTCAST\|DO\|DOUBLE\|ELSE\|ELSEIF\|END\|ENUM\|ENVIRON\|ERASE\|ERROR\|EVENT\|EXIT\|FALSE\|FIELD\|FILES\|FINALLY\|FOR(?: EACH)?\|FRIEND\|FUNCTION\|GET\|GETTYPE\|GETXMLNAMESPACE\|GLOBAL\|GOSUB\|GOTO\|HANDLES\|IF\|IMPLEMENTS\|IMPORTS\|IN\|INHERITS\|INPUT\|INTEGER\|INTERFACE\|IOCTL\|IS\|ISNOT\|KEY\|KILL\|LET\|LIB\|LIKE\|LINE INPUT\|LOCATE\|LOCK\|LONG\|LOOP\|LSET\|ME\|MKDIR\|MOD\|MODULE\|MUSTINHERIT\|MUSTOVERRIDE\|MYBASE\|MYCLASS\|NAME\|NAMESPACE\|NARROWING\|NEW\|NEXT\|NOT\|NOTHING\|NOTINHERITABLE\|NOTOVERRIDABLE\|OBJECT\|OF\|OFF\|ON(?: COM\| ERROR\| KEY\| TIMER)?\|OPEN\|OPERATOR\|OPTION(?: BASE)?\|OPTIONAL\|OR\|ORELSE\|OUT\|OVERLOADS\|OVERRIDABLE\|OVERRIDES\|PARAMARRAY\|PARTIAL\|POKE\|PRIVATE\|PROPERTY\|PROTECTED\|PUBLIC\|PUT\|RAISEEVENT\|READ\|READONLY\|REDIM\|REM\|REMOVEHANDLER\|RESTORE\|RESUME\|RETURN\|RMDIR\|RSET\|RUN\|SBYTE\|SELECT(?: CASE)?\|SET\|SHADOWS\|SHARED\|SHELL\|SHORT\|SINGLE\|SLEEP\|STATIC\|STEP\|STOP\|STRING\|STRUCTURE\|SUB\|SWAP\|SYNCLOCK\|SYSTEM\|THEN\|THROW\|TIMER\|TO\|TROFF\|TRON\|TRUE\|TRY\|TRYCAST\|TYPE\|TYPEOF\|UINTEGER\|ULONG\|UNLOCK\|UNTIL\|USHORT\|USING\|VIEW PRINT\|WAIT\|WEND\|WHEN\|WHILE\|WIDENING\|WITH\|WITHEVENTS\|WRITE\|WRITEONLY\|XOR)\|\B(?:#CONST\|#ELSE\|#ELSEIF\|#END\|#IF))(?:\$\|\b)/i,punctuation:/[,;:(){}]/});