Function disasmOpcode

txscript/opcode.go:715–754

disasmOpcode writes a human-readable disassembly of the provided opcode and data into the provided buffer. The compact flag indicates the disassembly should print a more compact representation of data-carrying and small integer opcodes. For example, OP_0 through OP_16 are replaced with the numeric

(buf *strings.Builder, op *opcode, data []byte, compact bool)

// opposed to including the opcode that specifies the amount of data to push as
// well.
func disasmOpcode(buf *strings.Builder, op *opcode, data []byte, compact bool) {
	// Replace opcode which represent values (e.g. OP_0 through OP_16 and
	// OP_1NEGATE) with the raw value when performing a compact disassembly.
	opcodeName := op.name
	if compact {
		if replName, ok := opcodeOnelineRepls[opcodeName]; ok {
			opcodeName = replName
		}

		// Either write the human-readable opcode or the parsed data in hex for
		// data-carrying opcodes.
		switch {
		case op.length == 1:
			buf.WriteString(opcodeName)

		default:
			buf.WriteString(hex.EncodeToString(data))
		}

		return
	}

	buf.WriteString(opcodeName)

	switch op.length {
	// Only write the opcode name for non-data push opcodes.
	case 1:
		return

	// Add length for the OP_PUSHDATA# opcodes.
	case -1:
		buf.WriteString(fmt.Sprintf(" 0x%02x", len(data)))
	case -2:
		buf.WriteString(fmt.Sprintf(" 0x%04x", len(data)))
	case -4:
		buf.WriteString(fmt.Sprintf(" 0x%08x", len(data)))
	}

	buf.WriteString(fmt.Sprintf(" 0x%02x", data))
}

// *******************************************
// Opcode implementation functions start here.