Sandbox::https://github.com/microsoft/vscode/pull/326706

soreavis · 2026-07-20T19:10:50Z

Implements the approach from #44135 (comment): ${workspaceFolder} is expanded on the client, and the server API stays unchanged.

Change

jsonClient.ts: when collecting json.schemas settings, a leading ${workspaceFolder} in a fileMatch pattern (also after a ! exclusion prefix) expands to the workspace folder path. This happens in the two scopes with an unambiguous folder: workspace folder settings in a multi-root workspace, and workspace settings of a single-folder workspace. User settings and multi-root workspace-file settings are left untouched (no single folder to expand to). Non-array/non-string values pass through unchanged.
utils/strings.ts: escapeGlobCharacters, used to insert the folder path into the pattern.
package.nls.json: documents the new pattern form.

Since the expanded pattern carries the folder path, the server's implicit **/ prefix no longer widens it below the folder — ${workspaceFolder}/*.json matches only in the folder root, ${workspaceFolder}/sub/*.json only in that subfolder, and existing patterns behave exactly as before.

Validation

A parity harness against the service's real createRegex + vscode-uri (66 cases): root-only and subfolder anchoring, recursive ** patterns, exclusions, the multi-root folderUri gate, folder names with spaces/unicode/parens/$/glob metacharacters/#/?, uppercase drive letters, filesystem-root and drive-root folders, and malformed fileMatch values (bare string, non-string entries — no throw, pass through).
End-to-end in a dev build, re-run on this revision: with a ${workspaceFolder}/*.json schema and a plain *.json schema both requiring a property, the folder-root file reports two diagnostics and a file in a subfolder reports one — the anchored schema applies at the root only.

Notes

The folder path is spelled the way the server spells the document uris it matches against: a leading drive letter is lowercased and # and ? are percent-encoded — Uri.path lowercases neither and decodes both. Glob metacharacters are encoded as \xAB escapes, which the glob parser copies through to the generated regular expression, so folder names like my[proj] or w*s match literally. A backslash escape can't be used for this — the parser has no escape syntax, so it copies the backslash through and still reads the next character as glob syntax.
Being a path, the pattern is not tied to a scheme or authority, and the **/ prefix still allows leading segments before it — the same as any absolute pattern written by hand today. In a multi-root workspace the existing folderUri gate still scopes each pattern to its folder.
While validating the multi-root case I noticed folder-scoped json.schemas (in a folder's .vscode/settings.json inside a .code-workspace) don't reach the server even for plain patterns, also on stable 1.129 — that looks like a separate pre-existing issue, independent of this change. I can file it with the minimal fixture if useful.

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Pull request overview

Adds ${workspaceFolder} expansion for JSON schema fileMatch patterns.

Changes:

Expands leading workspace-folder variables, including exclusions.
Documents supported scopes and usage.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
`extensions/json-language-features/client/src/jsonClient.ts`	Implements workspace-folder expansion.
`extensions/json-language-features/package.nls.json`	Documents the new pattern form.

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Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.

Martin Aeschlimann (aeschli) · 2026-07-21T08:20:10Z

+		// Drop the query and fragment like the server does for document uris, and turn glob
+		// metacharacters in the folder string into regex hex escapes, which the glob passes
+		// through, so folder names can not alter the meaning of the pattern.
+		const folderString = workspaceFolder.with({ query: '', fragment: '' }).toString(true)


For readability, can we just use fm.startsWith('${workspaceFolder}/')
To concatenate use the URI utils.
vscode.Uri.joinPath(workspaceFolder, fm.substring(...)

Switched the detection as requested. For the join I kept string concatenation — the rest of the pattern is a glob, not a path: Uri.joinPath(folder, 'file?.json').toString(true) comes back as …/file%3F.json, and the folder part carries the metachar escaping from the earlier round.

Right, the server does't want a URI but a posix path.
folder.path will give you the path segment

Done, using folder.path now.

Martin Aeschlimann (aeschli) · 2026-07-21T16:05:43Z

For

workspaceFolder.path
			.replace(/^\/[A-Z]:/, s => s.toLowerCase())
			.replace(/\/$/, '')
			.replace(/[*?{}[\],\\]/g, c => `\\x${c.charCodeAt(0).toString(16)}`);`

we normally use
escapeRegExpCharacters (

vscode/src/vs/base/common/strings.ts

Line 89 in f49c61e

export function escapeRegExpCharacters(value: string): string {

)

That code is not reachable in jsonClient, but I would suggest to create a extensions/json-language-features/client/src/utils/strings.ts with a copy of that function.

soreavis · 2026-07-21T17:24:39Z

escapeRegExpCharacters doesn't hold up here — the pattern hits the language service's glob parser before it's a regexp, and that parser has no escape syntax, so the backslash is copied through and the next character is still read as glob:

\. reaches the regexp as \\., so a folder like .config stops matching
\* becomes an unbalanced group that throws, and the catch drops the whole json.schemas entry

New file has escapeGlobCharacters instead. A second commit percent-encodes # and ? — folder.path decodes them, the document uris don't. That also retires the ?-folder gap in the description: nothing is stripped, doc uris carry %3F.

A fileMatch pattern has no way to target files in the workspace folder root only: patterns are matched against the full document uri with an implicit '**/' prefix, so `*.json` matches at every depth and a leading `/` is redundant. Expand a leading `${workspaceFolder}` (also after a `!` exclusion prefix) to the workspace folder uri when collecting json.schemas settings, in the two scopes with an unambiguous folder: workspace folder settings in a multi-root workspace and workspace settings of a single folder workspace. The expanded pattern is absolute, so the implicit '**/' prefix no longer widens it and `${workspaceFolder}/*.json` matches in the folder root only. The server API stays unchanged. Fixes microsoft#44135

The service's glob has no escape syntax, so a folder name containing a glob metacharacter altered the meaning of the expanded pattern: names with brackets or braces made it match nothing and a '*' made it match too much. Since the glob passes a backslash and alphanumerics through to the resulting regular expression verbatim, encoding the folder string's metacharacters as regex hex escapes makes them match literally. Also drop the query and fragment from the folder uri, mirroring what the server does to document uris before matching.

Copilot AI review requested due to automatic review settings July 20, 2026 19:10

soreavis mentioned this pull request Jul 20, 2026

[json] schema fileMatch for all *.json files in root folder #44135

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vs-code-engineering Bot assigned Martin Aeschlimann (aeschli) Jul 20, 2026

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ashitaka (dkstm95) mentioned this pull request Jul 21, 2026

Build Hope harness foundation and interactive diff review dkstm95/hope#6

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soreavis added 6 commits September 26, 2026 12:45

JSON - use startsWith to detect the ${workspaceFolder} prefix

7e54bd6

JSON - expand ${workspaceFolder} to the folder path

e322c7d

JSON - move the glob escaping to a strings util

7cd23c3

JSON - percent-encode # and ? when expanding ${workspaceFolder}

f1db298

soreavis force-pushed the fix/44135-json-filematch-workspacefolder branch from 31d3de9 to f1db298 Compare September 26, 2026 11:08

Martin Aeschlimann (aeschli) approved these changes Sep 29, 2026

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Michael Lively (Yoyokrazy) approved these changes Sep 29, 2026

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roblourens approved these changes Sep 30, 2026

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Martin Aeschlimann (aeschli) merged commit d4b0f3a into microsoft:main Sep 30, 2026
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vs-code-engineering Bot added this to the 1.141.0 milestone Sep 30, 2026

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JSON - support ${workspaceFolder} in json.schemas fileMatch patterns - #326706

JSON - support ${workspaceFolder} in json.schemas fileMatch patterns#326706
Martin Aeschlimann (aeschli) merged 6 commits into
microsoft:mainfrom
soreavis:fix/44135-json-filematch-workspacefolder

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