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package symbol
import "testing"
func TestSymbol(t *testing.T) {
tab := NewSymbolTable()
w := tab.Writer()
_, _ = w.RegisterStartSymbol("expr'")
_, _ = w.RegisterNonTerminalSymbol("expr")
_, _ = w.RegisterNonTerminalSymbol("term")
_, _ = w.RegisterNonTerminalSymbol("factor")
_, _ = w.RegisterTerminalSymbol("id")
_, _ = w.RegisterTerminalSymbol("add")
_, _ = w.RegisterTerminalSymbol("mul")
_, _ = w.RegisterTerminalSymbol("l_paren")
_, _ = w.RegisterTerminalSymbol("r_paren")
nonTermTexts := []string{
"", // Nil
"expr'",
"expr",
"term",
"factor",
}
termTexts := []string{
"", // Nil
symbolNameEOF, // EOF
"id",
"add",
"mul",
"l_paren",
"r_paren",
}
tests := []struct {
text string
isNil bool
isStart bool
isEOF bool
isNonTerminal bool
isTerminal bool
}{
{
text: "expr'",
isStart: true,
isNonTerminal: true,
},
{
text: "expr",
isNonTerminal: true,
},
{
text: "term",
isNonTerminal: true,
},
{
text: "factor",
isNonTerminal: true,
},
{
text: "id",
isTerminal: true,
},
{
text: "add",
isTerminal: true,
},
{
text: "mul",
isTerminal: true,
},
{
text: "l_paren",
isTerminal: true,
},
{
text: "r_paren",
isTerminal: true,
},
}
for _, tt := range tests {
t.Run(tt.text, func(t *testing.T) {
r := tab.Reader()
sym, ok := r.ToSymbol(tt.text)
if !ok {
t.Fatalf("symbol was not found")
}
testSymbolProperty(t, sym, tt.isNil, tt.isStart, tt.isEOF, tt.isNonTerminal, tt.isTerminal)
text, ok := r.ToText(sym)
if !ok {
t.Fatalf("text was not found")
}
if text != tt.text {
t.Fatalf("unexpected text representation; want: %v, got: %v", tt.text, text)
}
})
}
t.Run("EOF", func(t *testing.T) {
testSymbolProperty(t, SymbolEOF, false, false, true, false, true)
})
t.Run("Nil", func(t *testing.T) {
testSymbolProperty(t, SymbolNil, true, false, false, false, false)
})
t.Run("texts of non-terminals", func(t *testing.T) {
r := tab.Reader()
ts, err := r.NonTerminalTexts()
if err != nil {
t.Fatal(err)
}
if len(ts) != len(nonTermTexts) {
t.Fatalf("unexpected non-terminal count; want: %v (%#v), got: %v (%#v)", len(nonTermTexts), nonTermTexts, len(ts), ts)
}
for i, text := range ts {
if text != nonTermTexts[i] {
t.Fatalf("unexpected non-terminal; want: %v, got: %v", nonTermTexts[i], text)
}
}
})
t.Run("texts of terminals", func(t *testing.T) {
r := tab.Reader()
ts, err := r.TerminalTexts()
if err != nil {
t.Fatal(err)
}
if len(ts) != len(termTexts) {
t.Fatalf("unexpected terminal count; want: %v (%#v), got: %v (%#v)", len(termTexts), termTexts, len(ts), ts)
}
for i, text := range ts {
if text != termTexts[i] {
t.Fatalf("unexpected terminal; want: %v, got: %v", termTexts[i], text)
}
}
})
}
func testSymbolProperty(t *testing.T, sym Symbol, isNil, isStart, isEOF, isNonTerminal, isTerminal bool) {
t.Helper()
if v := sym.IsNil(); v != isNil {
t.Fatalf("isNil property is mismatched; want: %v, got: %v", isNil, v)
}
if v := sym.IsStart(); v != isStart {
t.Fatalf("isStart property is mismatched; want: %v, got: %v", isStart, v)
}
if v := sym.isEOF(); v != isEOF {
t.Fatalf("isEOF property is mismatched; want: %v, got: %v", isEOF, v)
}
if v := sym.isNonTerminal(); v != isNonTerminal {
t.Fatalf("isNonTerminal property is mismatched; want: %v, got: %v", isNonTerminal, v)
}
if v := sym.IsTerminal(); v != isTerminal {
t.Fatalf("isTerminal property is mismatched; want: %v, got: %v", isTerminal, v)
}
}
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