Method OpcodeDescription

syntax/code.go:246–313

OpcodeDescription is a humman readable string of the specific offset

(offset int)

// OpcodeDescription is a humman readable string of the specific offset
func (c *Code) OpcodeDescription(offset int) string {
	buf := &bytes.Buffer{}

	op := InstOp(c.Codes[offset])
	fmt.Fprintf(buf, "%06d ", offset)

	if opcodeBacktracks(op & Mask) {
		buf.WriteString("*")
	} else {
		buf.WriteString(" ")
	}
	buf.WriteString(operatorDescription(op))
	buf.WriteString("(")
	op &= Mask

	switch op {
	case One, Notone, Onerep, Notonerep, Oneloop, Notoneloop, Onelazy, Notonelazy,
		Oneloopatomic, Notoneloopatomic:
		buf.WriteString("Ch = ")
		buf.WriteString(CharDescription(rune(c.Codes[offset+1])))

	case Set, Setrep, Setloop, Setlazy, Setloopatomic:
		buf.WriteString("Set = ")
		buf.WriteString(c.Sets[c.Codes[offset+1]].String())

	case Multi:
		fmt.Fprintf(buf, "String = %s", string(c.Strings[c.Codes[offset+1]]))

	case Ref, Testref:
		fmt.Fprintf(buf, "Index = %d", c.Codes[offset+1])

	case Capturemark:
		fmt.Fprintf(buf, "Index = %d", c.Codes[offset+1])
		if c.Codes[offset+2] != -1 {
			fmt.Fprintf(buf, ", Unindex = %d", c.Codes[offset+2])
		}

	case Nullcount, Setcount:
		fmt.Fprintf(buf, "Value = %d", c.Codes[offset+1])

	case Goto, Lazybranch, Branchmark, Lazybranchmark, Branchcount, Lazybranchcount:
		fmt.Fprintf(buf, "Addr = %d", c.Codes[offset+1])
	}

	switch op {
	case Onerep, Notonerep, Oneloop, Notoneloop, Onelazy, Notonelazy, Setrep, Setloop, Setlazy,
		Oneloopatomic, Notoneloopatomic, Setloopatomic:
		buf.WriteString(", Rep = ")
		if c.Codes[offset+2] == math.MaxInt32 {
			buf.WriteString("inf")
		} else {
			fmt.Fprintf(buf, "%d", c.Codes[offset+2])
		}

	case Branchcount, Lazybranchcount:
		buf.WriteString(", Limit = ")
		if c.Codes[offset+2] == math.MaxInt32 {
			buf.WriteString("inf")