Function ScriptTemplate

txscript/template.go:55–87

ScriptTemplate processes a script template with parameters and returns the corresponding script bytes. This functions allows Bitcoin scripts to be created using a DSL-like syntax, based on Go's templating system. An example of a simple p2pkh template would be: `OP_DUP OP_HASH160 0x14e8948c7afa71b

(scriptTmpl string, opts ...ScriptTemplateOption)

// houses paramters to pass into the script, for example a local variable
// storing a computed public key.
func ScriptTemplate(scriptTmpl string, opts ...ScriptTemplateOption) ([]byte, error) {
	cfg := &templateConfig{
		params:      make(map[string]interface{}),
		customFuncs: make(template.FuncMap),
	}

	for _, opt := range opts {
		opt(cfg)
	}

	funcMap := template.FuncMap{
		"hex":        hexEncode,
		"hex_str":    hexStr,
		"unhex":      hexDecode,
		"range_iter": rangeIter,
	}

	for k, v := range cfg.customFuncs {
		funcMap[k] = v
	}

	tmpl, err := template.New("script").Funcs(funcMap).Parse(scriptTmpl)
	if err != nil {
		return nil, fmt.Errorf("failed to parse template: %w", err)
	}

	var buf bytes.Buffer
	if err := tmpl.Execute(&buf, cfg.params); err != nil {
		return nil, fmt.Errorf("failed to execute template: %w", err)
	}

	return processScript(buf.String())
}

// looksLikeInt checks if a string looks like an integer.
func looksLikeInt(s string) bool {