Replace Handlebars parser with Peggy grammar for @glimmer/syntax#21308

Draft

NullVoxPopuli-ai-agent wants to merge 55 commits intoemberjs:mainfrom

NullVoxPopuli-ai-agent:merge-handlebars-parser-into-glimmer-syntax

Commits on Apr 9, 2026

Merge @handlebars/parser into @glimmer/syntax

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Fix CI: restore partial/decorator handling, fix lint issues

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Update .prettierignore for moved grammar files

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Simplify inlined handlebars parser for Glimmer

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Convert Exception to proper Error subclass

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Replace Jison-generated parser with recursive-descent parser

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Fix rd-parser: don't break at {{ in parseProgram

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Update tests: accept parse-time errors for decorators/partial-blocks

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Fix rd-parser: escaped mustaches, strip+unescaped open

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Fix rd-parser: hash pairs with spaces, numeric path segments

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Fix rd-parser: backslash escape handling before {{

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Fix rd-parser: only allow digit-starting path segments after separators

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Fix rd-parser: preserve raw source text in ContentStatement.original

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Fix rd-parser: split ContentStatements at escaped mustache boundaries

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Fix rd-parser: stop escaped mustache content at any \+{{ boundary

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Fix rd-parser: match Jison error message format exactly

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Fix rd-parser: match Jison backslash and error display behavior

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Fix rd-parser: match Jison token list and column for invalid chars

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Fix rd-parser: don't treat whitespace as invalid token

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Fix rd-parser: don't catch . and [ as invalid tokens

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Address review feedback

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Commits on Apr 10, 2026

Commits on Apr 11, 2026

Commits on Apr 15, 2026