diff options
Diffstat (limited to 'grammar/lalr1_test.go')
-rw-r--r-- | grammar/lalr1_test.go | 164 |
1 files changed, 35 insertions, 129 deletions
diff --git a/grammar/lalr1_test.go b/grammar/lalr1_test.go index 67ab7d0..7d8e48d 100644 --- a/grammar/lalr1_test.go +++ b/grammar/lalr1_test.go @@ -1,7 +1,6 @@ package grammar import ( - "fmt" "strings" "testing" @@ -19,37 +18,39 @@ ref: '*'; id: "[A-Za-z0-9_]+"; ` - ast, err := spec.Parse(strings.NewReader(src)) - if err != nil { - t.Fatal(err) - } - b := GrammarBuilder{ - AST: ast, - } - gram, err := b.Build() - if err != nil { - t.Fatal(err) - } - - lr0, err := genLR0Automaton(gram.productionSet, gram.augmentedStartSymbol) - if err != nil { - t.Fatalf("failed to create a LR0 automaton: %v", err) - } - if lr0 == nil { - t.Fatalf("genLR0Automaton returns nil without any error") - } - - firstSet, err := genFirstSet(gram.productionSet) - if err != nil { - t.Fatalf("failed to create a FIRST set: %v", err) - } - - automaton, err := genLALR1Automaton(lr0, gram.productionSet, firstSet) - if err != nil { - t.Fatalf("failed to create a LALR1 automaton: %v", err) - } - if automaton == nil { - t.Fatalf("genLALR1Automaton returns nil without any error") + var gram *Grammar + var automaton *lalr1Automaton + { + ast, err := spec.Parse(strings.NewReader(src)) + if err != nil { + t.Fatal(err) + } + b := GrammarBuilder{ + AST: ast, + } + + gram, err = b.Build() + if err != nil { + t.Fatal(err) + } + + lr0, err := genLR0Automaton(gram.productionSet, gram.augmentedStartSymbol) + if err != nil { + t.Fatalf("failed to create a LR0 automaton: %v", err) + } + + firstSet, err := genFirstSet(gram.productionSet) + if err != nil { + t.Fatalf("failed to create a FIRST set: %v", err) + } + + automaton, err = genLALR1Automaton(lr0, gram.productionSet, firstSet) + if err != nil { + t.Fatalf("failed to create a LALR1 automaton: %v", err) + } + if automaton == nil { + t.Fatalf("genLALR1Automaton returns nil without any error") + } } initialState := automaton.states[automaton.initialState] @@ -95,7 +96,7 @@ id: "[A-Za-z0-9_]+"; }, } - expectedStates := []expectedLRState{ + expectedStates := []*expectedLRState{ { kernelItems: expectedKernels[0], nextStates: map[symbol][]*lrItem{ @@ -180,100 +181,5 @@ id: "[A-Za-z0-9_]+"; }, } - if len(automaton.states) != len(expectedStates) { - t.Errorf("state count is mismatched; want: %v, got: %v", len(expectedStates), len(automaton.states)) - } - - for i, eState := range expectedStates { - t.Run(fmt.Sprintf("state #%v", i), func(t *testing.T) { - k, err := newKernel(eState.kernelItems) - if err != nil { - t.Fatalf("failed to create a kernel item: %v", err) - } - - state, ok := automaton.states[k.id] - if !ok { - t.Fatalf("a kernel was not found: %v", k.id) - } - - // test look-ahead symbols - { - if len(state.kernel.items) != len(eState.kernelItems) { - t.Errorf("kernels is mismatched; want: %v, got: %v", len(eState.kernelItems), len(state.kernel.items)) - } - for _, eKItem := range eState.kernelItems { - var kItem *lrItem - for _, it := range state.kernel.items { - if it.id != eKItem.id { - continue - } - kItem = it - break - } - if kItem == nil { - t.Fatalf("kernel item not found; want: %v, got: %v", eKItem.id, kItem.id) - } - - if len(kItem.lookAhead.symbols) != len(eKItem.lookAhead.symbols) { - t.Errorf("look-ahead symbols are mismatched; want: %v symbols, got: %v symbols", len(eKItem.lookAhead.symbols), len(kItem.lookAhead.symbols)) - } - - for eSym := range eKItem.lookAhead.symbols { - if _, ok := kItem.lookAhead.symbols[eSym]; !ok { - t.Errorf("look-ahead symbol not found: %v", eSym) - } - } - } - } - - // test next states - { - if len(state.next) != len(eState.nextStates) { - t.Errorf("next state count is mismatched; want: %v, got: %v", len(eState.nextStates), len(state.next)) - } - for eSym, eKItems := range eState.nextStates { - nextStateKernel, err := newKernel(eKItems) - if err != nil { - t.Fatalf("failed to create a kernel item: %v", err) - } - nextState, ok := state.next[eSym] - if !ok { - t.Fatalf("next state was not found; state: %v, symbol: %v (%v)", state.id, "expr", eSym) - } - if nextState != nextStateKernel.id { - t.Fatalf("a kernel ID of the next state is mismatched; want: %v, got: %v", nextStateKernel.id, nextState) - } - } - } - - // test reducible productions - { - if len(state.reducible) != len(eState.reducibleProds) { - t.Errorf("reducible production count is mismatched; want: %v, got: %v", len(eState.reducibleProds), len(state.reducible)) - } - for _, eProd := range eState.reducibleProds { - if _, ok := state.reducible[eProd.id]; !ok { - t.Errorf("reducible production was not found: %v", eProd.id) - } - } - - if len(state.emptyProdItems) != len(eState.emptyProdItems) { - t.Errorf("empty production item is mismatched; want: %v, got: %v", len(eState.emptyProdItems), len(state.emptyProdItems)) - } - for _, eItem := range eState.emptyProdItems { - found := false - for _, item := range state.emptyProdItems { - if item.id != eItem.id { - continue - } - found = true - break - } - if !found { - t.Errorf("empty production item not found: %v", eItem.id) - } - } - } - }) - } + testLRAutomaton(t, expectedStates, automaton.lr0Automaton) } |