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-rw-r--r--tests/unit/grammar/test_helper_test.go68
1 files changed, 68 insertions, 0 deletions
diff --git a/tests/unit/grammar/test_helper_test.go b/tests/unit/grammar/test_helper_test.go
new file mode 100644
index 0000000..546d2c1
--- /dev/null
+++ b/tests/unit/grammar/test_helper_test.go
@@ -0,0 +1,68 @@
+package grammar
+
+import (
+ "testing"
+
+ "urubu/grammar/symbol"
+)
+
+type testSymbolGenerator func(text string) symbol.Symbol
+
+func newTestSymbolGenerator(t *testing.T, symTab *symbol.SymbolTableReader) testSymbolGenerator {
+ return func(text string) symbol.Symbol {
+ t.Helper()
+
+ sym, ok := symTab.ToSymbol(text)
+ if !ok {
+ t.Fatalf("symbol was not found: %v", text)
+ }
+ return sym
+ }
+}
+
+type testProductionGenerator func(lhs string, rhs ...string) *production
+
+func newTestProductionGenerator(t *testing.T, genSym testSymbolGenerator) testProductionGenerator {
+ return func(lhs string, rhs ...string) *production {
+ t.Helper()
+
+ rhsSym := []symbol.Symbol{}
+ for _, text := range rhs {
+ rhsSym = append(rhsSym, genSym(text))
+ }
+ prod, err := newProduction(genSym(lhs), rhsSym)
+ if err != nil {
+ t.Fatalf("failed to create a production: %v", err)
+ }
+
+ return prod
+ }
+}
+
+type testLR0ItemGenerator func(lhs string, dot int, rhs ...string) *lrItem
+
+func newTestLR0ItemGenerator(t *testing.T, genProd testProductionGenerator) testLR0ItemGenerator {
+ return func(lhs string, dot int, rhs ...string) *lrItem {
+ t.Helper()
+
+ prod := genProd(lhs, rhs...)
+ item, err := newLR0Item(prod, dot)
+ if err != nil {
+ t.Fatalf("failed to create a LR0 item: %v", err)
+ }
+
+ return item
+ }
+}
+
+func withLookAhead(item *lrItem, lookAhead ...symbol.Symbol) *lrItem {
+ if item.lookAhead.symbols == nil {
+ item.lookAhead.symbols = map[symbol.Symbol]struct{}{}
+ }
+
+ for _, a := range lookAhead {
+ item.lookAhead.symbols[a] = struct{}{}
+ }
+
+ return item
+}