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package participle_test
import (
"testing"
require "github.com/alecthomas/assert/v2"
"github.com/alecthomas/participle/v2"
)
type leftRecursionSimple struct {
Begin string ` @Ident`
More *leftRecursionSimple `| @@ "more"`
}
func TestValidateLeftRecursion(t *testing.T) {
_, err := participle.Build[leftRecursionSimple]()
require.Error(t, err)
require.Equal(t, err.Error(), `left recursion detected on
LeftRecursionSimple = <ident> | (LeftRecursionSimple "more") .`)
}
type leftRecursionNestedInner struct {
Begin string ` @Ident`
Next *leftRecursionNested `| @@`
}
type leftRecursionNested struct {
Begin string ` @Ident`
More *leftRecursionNestedInner `| @@ "more"`
}
func TestValidateLeftRecursionNested(t *testing.T) {
_, err := participle.Build[leftRecursionNested]()
require.Error(t, err)
require.Equal(t, err.Error(), `left recursion detected on
LeftRecursionNested = <ident> | (LeftRecursionNestedInner "more") .
LeftRecursionNestedInner = <ident> | LeftRecursionNested .`)
}
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