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|
package driver
import (
"strings"
"testing"
"github.com/nihei9/vartan/grammar"
"github.com/nihei9/vartan/spec"
)
func TestParserWithLAC(t *testing.T) {
specSrc := `
S
: C C
;
C
: c C
| d
;
c: 'c';
d: 'd';
`
src := `ccd`
actLogWithLAC := []string{
"shift/c",
"shift/c",
"shift/d",
"miss",
}
actLogWithoutLAC := []string{
"shift/c",
"shift/c",
"shift/d",
"reduce/C",
"reduce/C",
"reduce/C",
"miss",
}
ast, err := spec.Parse(strings.NewReader(specSrc))
if err != nil {
t.Fatal(err)
}
b := grammar.GrammarBuilder{
AST: ast,
}
g, err := b.Build()
if err != nil {
t.Fatal(err)
}
gram, err := grammar.Compile(g, grammar.SpecifyClass(grammar.ClassLALR))
if err != nil {
t.Fatal(err)
}
t.Run("LAC is enabled", func(t *testing.T) {
semAct := &testSemAct{
gram: gram,
}
p, err := NewParser(gram, strings.NewReader(src), SemanticAction(semAct))
if err != nil {
t.Fatal(err)
}
err = p.Parse()
if err != nil {
t.Fatal(err)
}
if len(semAct.actLog) != len(actLogWithLAC) {
t.Fatalf("unexpected action log; want: %+v, got: %+v", actLogWithLAC, semAct.actLog)
}
for i, e := range actLogWithLAC {
if semAct.actLog[i] != e {
t.Fatalf("unexpected action log; want: %+v, got: %+v", actLogWithLAC, semAct.actLog)
}
}
})
t.Run("LAC is disabled", func(t *testing.T) {
semAct := &testSemAct{
gram: gram,
}
p, err := NewParser(gram, strings.NewReader(src), SemanticAction(semAct), DisableLAC())
if err != nil {
t.Fatal(err)
}
err = p.Parse()
if err != nil {
t.Fatal(err)
}
if len(semAct.actLog) != len(actLogWithoutLAC) {
t.Fatalf("unexpected action log; want: %+v, got: %+v", actLogWithoutLAC, semAct.actLog)
}
for i, e := range actLogWithoutLAC {
if semAct.actLog[i] != e {
t.Fatalf("unexpected action log; want: %+v, got: %+v", actLogWithoutLAC, semAct.actLog)
}
}
})
}
|
