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Diffstat (limited to 'tests/unit/grammar/lr0_test.go')
-rw-r--r--tests/unit/grammar/lr0_test.go448
1 files changed, 0 insertions, 448 deletions
diff --git a/tests/unit/grammar/lr0_test.go b/tests/unit/grammar/lr0_test.go
deleted file mode 100644
index 0a9ec24..0000000
--- a/tests/unit/grammar/lr0_test.go
+++ /dev/null
@@ -1,448 +0,0 @@
-package grammar
-
-import (
- "fmt"
- "strings"
- "testing"
-
- "urubu/grammar/symbol"
- "urubu/spec/grammar/parser"
-)
-
-type expectedLRState struct {
- kernelItems []*lrItem
- nextStates map[symbol.Symbol][]*lrItem
- reducibleProds []*production
- emptyProdItems []*lrItem
-}
-
-func TestGenLR0Automaton(t *testing.T) {
- src := `
-#name test;
-
-expr
- : expr add term
- | term
- ;
-term
- : term mul factor
- | factor
- ;
-factor
- : l_paren expr r_paren
- | id
- ;
-add: "\+";
-mul: "\*";
-l_paren: "\(";
-r_paren: "\)";
-id: "[A-Za-z_][0-9A-Za-z_]*";
-`
-
- var gram *Grammar
- var automaton *lr0Automaton
- {
- ast, err := parser.Parse(strings.NewReader(src))
- if err != nil {
- t.Fatal(err)
- }
- b := GrammarBuilder{
- AST: ast,
- }
- gram, err = b.build()
- if err != nil {
- t.Fatal(err)
- }
-
- automaton, err = genLR0Automaton(gram.productionSet, gram.augmentedStartSymbol, gram.errorSymbol)
- if err != nil {
- t.Fatalf("failed to create a LR0 automaton: %v", err)
- }
- if automaton == nil {
- t.Fatalf("genLR0Automaton returns nil without any error")
- }
- }
-
- initialState := automaton.states[automaton.initialState]
- if initialState == nil {
- t.Errorf("failed to get an initial status: %v", automaton.initialState)
- }
-
- genSym := newTestSymbolGenerator(t, gram.symbolTable)
- genProd := newTestProductionGenerator(t, genSym)
- genLR0Item := newTestLR0ItemGenerator(t, genProd)
-
- expectedKernels := map[int][]*lrItem{
- 0: {
- genLR0Item("expr'", 0, "expr"),
- },
- 1: {
- genLR0Item("expr'", 1, "expr"),
- genLR0Item("expr", 1, "expr", "add", "term"),
- },
- 2: {
- genLR0Item("expr", 1, "term"),
- genLR0Item("term", 1, "term", "mul", "factor"),
- },
- 3: {
- genLR0Item("term", 1, "factor"),
- },
- 4: {
- genLR0Item("factor", 1, "l_paren", "expr", "r_paren"),
- },
- 5: {
- genLR0Item("factor", 1, "id"),
- },
- 6: {
- genLR0Item("expr", 2, "expr", "add", "term"),
- },
- 7: {
- genLR0Item("term", 2, "term", "mul", "factor"),
- },
- 8: {
- genLR0Item("expr", 1, "expr", "add", "term"),
- genLR0Item("factor", 2, "l_paren", "expr", "r_paren"),
- },
- 9: {
- genLR0Item("expr", 3, "expr", "add", "term"),
- genLR0Item("term", 1, "term", "mul", "factor"),
- },
- 10: {
- genLR0Item("term", 3, "term", "mul", "factor"),
- },
- 11: {
- genLR0Item("factor", 3, "l_paren", "expr", "r_paren"),
- },
- }
-
- expectedStates := []*expectedLRState{
- {
- kernelItems: expectedKernels[0],
- nextStates: map[symbol.Symbol][]*lrItem{
- genSym("expr"): expectedKernels[1],
- genSym("term"): expectedKernels[2],
- genSym("factor"): expectedKernels[3],
- genSym("l_paren"): expectedKernels[4],
- genSym("id"): expectedKernels[5],
- },
- reducibleProds: []*production{},
- },
- {
- kernelItems: expectedKernels[1],
- nextStates: map[symbol.Symbol][]*lrItem{
- genSym("add"): expectedKernels[6],
- },
- reducibleProds: []*production{
- genProd("expr'", "expr"),
- },
- },
- {
- kernelItems: expectedKernels[2],
- nextStates: map[symbol.Symbol][]*lrItem{
- genSym("mul"): expectedKernels[7],
- },
- reducibleProds: []*production{
- genProd("expr", "term"),
- },
- },
- {
- kernelItems: expectedKernels[3],
- nextStates: map[symbol.Symbol][]*lrItem{},
- reducibleProds: []*production{
- genProd("term", "factor"),
- },
- },
- {
- kernelItems: expectedKernels[4],
- nextStates: map[symbol.Symbol][]*lrItem{
- genSym("expr"): expectedKernels[8],
- genSym("term"): expectedKernels[2],
- genSym("factor"): expectedKernels[3],
- genSym("l_paren"): expectedKernels[4],
- genSym("id"): expectedKernels[5],
- },
- reducibleProds: []*production{},
- },
- {
- kernelItems: expectedKernels[5],
- nextStates: map[symbol.Symbol][]*lrItem{},
- reducibleProds: []*production{
- genProd("factor", "id"),
- },
- },
- {
- kernelItems: expectedKernels[6],
- nextStates: map[symbol.Symbol][]*lrItem{
- genSym("term"): expectedKernels[9],
- genSym("factor"): expectedKernels[3],
- genSym("l_paren"): expectedKernels[4],
- genSym("id"): expectedKernels[5],
- },
- reducibleProds: []*production{},
- },
- {
- kernelItems: expectedKernels[7],
- nextStates: map[symbol.Symbol][]*lrItem{
- genSym("factor"): expectedKernels[10],
- genSym("l_paren"): expectedKernels[4],
- genSym("id"): expectedKernels[5],
- },
- reducibleProds: []*production{},
- },
- {
- kernelItems: expectedKernels[8],
- nextStates: map[symbol.Symbol][]*lrItem{
- genSym("add"): expectedKernels[6],
- genSym("r_paren"): expectedKernels[11],
- },
- reducibleProds: []*production{},
- },
- {
- kernelItems: expectedKernels[9],
- nextStates: map[symbol.Symbol][]*lrItem{
- genSym("mul"): expectedKernels[7],
- },
- reducibleProds: []*production{
- genProd("expr", "expr", "add", "term"),
- },
- },
- {
- kernelItems: expectedKernels[10],
- nextStates: map[symbol.Symbol][]*lrItem{},
- reducibleProds: []*production{
- genProd("term", "term", "mul", "factor"),
- },
- },
- {
- kernelItems: expectedKernels[11],
- nextStates: map[symbol.Symbol][]*lrItem{},
- reducibleProds: []*production{
- genProd("factor", "l_paren", "expr", "r_paren"),
- },
- },
- }
-
- testLRAutomaton(t, expectedStates, automaton)
-}
-
-func TestLR0AutomatonContainingEmptyProduction(t *testing.T) {
- src := `
-#name test;
-
-s
- : foo bar
- ;
-foo
- :
- ;
-bar
- : b
- |
- ;
-
-b: "bar";
-`
-
- var gram *Grammar
- var automaton *lr0Automaton
- {
- ast, err := parser.Parse(strings.NewReader(src))
- if err != nil {
- t.Fatal(err)
- }
-
- b := GrammarBuilder{
- AST: ast,
- }
- gram, err = b.build()
- if err != nil {
- t.Fatal(err)
- }
-
- automaton, err = genLR0Automaton(gram.productionSet, gram.augmentedStartSymbol, gram.errorSymbol)
- if err != nil {
- t.Fatalf("failed to create a LR0 automaton: %v", err)
- }
- if automaton == nil {
- t.Fatalf("genLR0Automaton returns nil without any error")
- }
- }
-
- initialState := automaton.states[automaton.initialState]
- if initialState == nil {
- t.Errorf("failed to get an initial status: %v", automaton.initialState)
- }
-
- genSym := newTestSymbolGenerator(t, gram.symbolTable)
- genProd := newTestProductionGenerator(t, genSym)
- genLR0Item := newTestLR0ItemGenerator(t, genProd)
-
- expectedKernels := map[int][]*lrItem{
- 0: {
- genLR0Item("s'", 0, "s"),
- },
- 1: {
- genLR0Item("s'", 1, "s"),
- },
- 2: {
- genLR0Item("s", 1, "foo", "bar"),
- },
- 3: {
- genLR0Item("s", 2, "foo", "bar"),
- },
- 4: {
- genLR0Item("bar", 1, "b"),
- },
- }
-
- expectedStates := []*expectedLRState{
- {
- kernelItems: expectedKernels[0],
- nextStates: map[symbol.Symbol][]*lrItem{
- genSym("s"): expectedKernels[1],
- genSym("foo"): expectedKernels[2],
- },
- reducibleProds: []*production{
- genProd("foo"),
- },
- emptyProdItems: []*lrItem{
- genLR0Item("foo", 0),
- },
- },
- {
- kernelItems: expectedKernels[1],
- nextStates: map[symbol.Symbol][]*lrItem{},
- reducibleProds: []*production{
- genProd("s'", "s"),
- },
- },
- {
- kernelItems: expectedKernels[2],
- nextStates: map[symbol.Symbol][]*lrItem{
- genSym("bar"): expectedKernels[3],
- genSym("b"): expectedKernels[4],
- },
- reducibleProds: []*production{
- genProd("bar"),
- },
- emptyProdItems: []*lrItem{
- genLR0Item("bar", 0),
- },
- },
- {
- kernelItems: expectedKernels[3],
- nextStates: map[symbol.Symbol][]*lrItem{},
- reducibleProds: []*production{
- genProd("s", "foo", "bar"),
- },
- },
- {
- kernelItems: expectedKernels[4],
- nextStates: map[symbol.Symbol][]*lrItem{},
- reducibleProds: []*production{
- genProd("bar", "b"),
- },
- },
- }
-
- testLRAutomaton(t, expectedStates, automaton)
-}
-
-func testLRAutomaton(t *testing.T, expected []*expectedLRState, automaton *lr0Automaton) {
- if len(automaton.states) != len(expected) {
- t.Errorf("state count is mismatched; want: %v, got: %v", len(expected), len(automaton.states))
- }
-
- for i, eState := range expected {
- 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 mismcthed; 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)
- }
- }
- }
- })
- }
-}
generated by cgit v1.2.3 (git 2.49.0) at 2025-07-12 21:13:10 +0000