Function IsPushOnlyScript

txscript/script.go:133–146

IsPushOnlyScript returns whether or not the passed script only pushes data according to the consensus definition of pushing data. WARNING: This function always treats the passed script as version 0. Great care must be taken if introducing a new script version because it is used in consensus which,

(script []byte)

// script versions before checking if it is a push only script which means nodes
// on existing rules will treat new version scripts as if they were version 0.
func IsPushOnlyScript(script []byte) bool {
	const scriptVersion = 0
	tokenizer := MakeScriptTokenizer(scriptVersion, script)
	for tokenizer.Next() {
		// All opcodes up to OP_16 are data push instructions.
		// NOTE: This does consider OP_RESERVED to be a data push instruction,
		// but execution of OP_RESERVED will fail anyway and matches the
		// behavior required by consensus.
		if tokenizer.Opcode() > OP_16 {
			return false
		}
	}
	return tokenizer.Err() == nil
}

// DisasmString formats a disassembled script for one line printing.  When the
// script fails to parse, the returned string will contain the disassembled