add peg as a tool dependency

.github/dependabot.yml

@@ -0,0 +1,12 @@
+version: 2
+updates:
+  - package-ecosystem: "gomod"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 5
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 5

.github/workflows/test.yml

@@ -18,6 +18,13 @@ jobs:
         with:
           go-version-file: 'go.mod'
 
+      - name: Generate parser (peg)
+        run: go generate ./...
+
+      - name: Check generated files up-to-date
+        run: |
+          git --no-pager diff --exit-code || (echo "Run 'go generate ./...' and commit generated changes" && exit 1)
+
       - name: Run Unit tests
         run: go test -race -covermode atomic -coverprofile=covprofile -coverpkg=.,./config,./errors,./internal/syntax ./...
 

go.mod

@@ -1,3 +1,5 @@
 module github.com/AsaiYusuke/jsonpath/v2
 
-go 1.24
+go 1.25
+
+require github.com/pointlander/peg v1.0.2-0.20250815145649-e7926250bae5

go.sum

@@ -0,0 +1,2 @@
+github.com/pointlander/peg v1.0.2-0.20250815145649-e7926250bae5 h1:HpP/2mYdqYYy33qBhgkJtordzBMQivEO4yKh2TsPFis=
+github.com/pointlander/peg v1.0.2-0.20250815145649-e7926250bae5/go.mod h1:jOjW+bhmjY4xlK6MReHcgyq470+kgM+74DE4xP6G86Y=

internal/depends/depends.go

@@ -0,0 +1,6 @@
+//go:build depends
+// +build depends
+
+package depends
+
+import _ "github.com/pointlander/peg"

internal/grammer/generate.go

@@ -0,0 +1,3 @@
+package grammer
+
+//go:generate go run github.com/pointlander/peg -inline -switch -output ../syntax/grammar.go grammar.peg