Function TestExprVisitor

common/ast/navigable_test.go:136–225

(t *testing.T)

}

func TestExprVisitor(t *testing.T) {
	tests := []struct {
		expr         string
		preOrderIDs  []int64
		postOrderIDs []int64
	}{
		{
			// [2] ==, [1] 'a', [3] 'b'
			expr:         `'a' == 'b'`,
			preOrderIDs:  []int64{2, 1, 3},
			postOrderIDs: []int64{1, 3, 2},
		},
		{
			// [2] size(), [1] 'a'
			expr:         `'a'.size()`,
			preOrderIDs:  []int64{2, 1},
			postOrderIDs: []int64{1, 2},
		},
		{
			// [3] ==, [1] type(), [2] 1, [4] int
			expr:         `type(1) == int`,
			preOrderIDs:  []int64{3, 1, 2, 4},
			postOrderIDs: []int64{2, 1, 4, 3},
		},
		{
			// [5] .hello, [1] {}, [3] 'hello', [4] 'world'
			expr:         `{'hello': 'world'}.hello`,
			preOrderIDs:  []int64{5, 1, 3, 4},
			postOrderIDs: []int64{3, 4, 1, 5},
		},
		{
			// [1] TestAllTypes, [3] 1
			expr:         `google.expr.proto3.test.TestAllTypes{single_int32: 1}`,
			preOrderIDs:  []int64{1, 3},
			postOrderIDs: []int64{3, 1},
		},
		{
			// [13] comprehension
			// range:    [1] [], [2] true
			// accuInit: [6] result=false
			// loopCond: [9] @not_strictly_false, [8] !, [7] result
			// loopStep: [11] ||, [10] result [5] i
			// result:   [12] result
			expr:         `[true].exists(i, i)`,
			preOrderIDs:  []int64{13, 1, 2, 6, 9, 8, 7, 11, 10, 5, 12},
			postOrderIDs: []int64{2, 1, 6, 7, 8, 9, 10, 5, 11, 12, 13},
		},
	}

	for _, tst := range tests {
		tc := tst
		t.Run(tc.expr, func(t *testing.T) {
			checked := mustTypeCheck(t, tc.expr)
			root := ast.NavigateAST(checked)
			// Verify pre order visit behavior
			preOrderExprIDs := []int64{}
			navVisitor := ast.NewExprVisitor(func(e ast.Expr) {
				nav := e.(ast.NavigableExpr)