Add parser for double

This commit is contained in:
lash 2023-04-05 08:12:13 +01:00
parent 7cf1de955e
commit 7d788fe172
Signed by untrusted user who does not match committer: lash
GPG Key ID: 21D2E7BB88C2A746
2 changed files with 68 additions and 1 deletions

View File

@ -70,8 +70,8 @@ type Arg struct {
ArgNone string "Whitespace?"
ArgDisplay *Display `@@?`
ArgSized *Sized `@@?`
ArgSingle *Single `@@?`
ArgDouble *Double `@@?`
ArgSingle *Single `@@?`
}
func (a Arg) String() string {
@ -194,6 +194,42 @@ func parseDisplay(op vm.Opcode, arg Arg, w io.Writer) (int, error) {
return rn, err
}
func parseDouble(op vm.Opcode, arg Arg, w io.Writer) (int, error) {
var rn int
v := arg.ArgDouble
if v == nil {
return 0, nil
}
b := bytes.NewBuffer(nil)
n, err := writeOpcode(op, b)
rn += n
if err != nil {
return rn, err
}
n, err = writeSym(v.One, b)
rn += n
if err != nil {
return rn, err
}
n, err = writeSym(v.Two, b)
rn += n
if err != nil {
return rn, err
}
if w != nil {
rn, err = w.Write(b.Bytes())
} else {
rn = 0
}
return rn, err
}
func parseSized(op vm.Opcode, arg Arg, w io.Writer) (int, error) {
var rn int
@ -253,6 +289,15 @@ func Parse(s string, w io.Writer) (int, error) {
rn += n
continue
}
n, err = parseDouble(op, v.OpArg, w)
if err != nil {
return n, err
}
if n > 0 {
rn += n
continue
}
}
return rn, err
}

View File

@ -13,6 +13,7 @@ func TestParserInit(t *testing.T) {
var b []byte
b = vm.NewLine(b, vm.HALT, nil, nil, nil)
b = vm.NewLine(b, vm.CATCH, []string{"xyzzy"}, []byte{0x02, 0x9a}, []uint8{1})
b = vm.NewLine(b, vm.INCMP, []string{"inky", "pinky"}, nil, nil)
b = vm.NewLine(b, vm.LOAD, []string{"foo"}, []byte{42}, nil)
b = vm.NewLine(b, vm.MOUT, []string{"bar", "barbarbaz"}, nil, nil)
s, err := vm.ToString(b)
@ -67,3 +68,24 @@ func TestParseDisplay(t *testing.T) {
t.Fatalf("expected %x, got %x", expect, rb)
}
}
func TestParseDouble(t *testing.T) {
var b []byte
b = vm.NewLine(b, vm.INCMP, []string{"foo", "bar"}, nil, nil)
s, err := vm.ToString(b)
log.Printf("parsing:\n%s\n", s)
r := bytes.NewBuffer(nil)
n, err := Parse(s, r)
if err != nil {
t.Fatal(err)
}
if n != 10 {
t.Fatalf("expected 18 byte write count, got %v", n)
}
rb := r.Bytes()
expect := []byte{0x00, vm.INCMP, 0x03, 0x66, 0x6f, 0x6f, 0x03, 0x62, 0x61, 0x72}
if !bytes.Equal(rb, expect) {
t.Fatalf("expected %x, got %x", expect, rb)
}
}