func Transform()

in tools/migration/crosstool_to_starlark_lib.go [1298:1419]
101 lines of code
20 McCabe index (conditional complexity)

func Transform(crosstool *crosstoolpb.CrosstoolRelease) (string, error) {
	var b bytes.Buffer

	cToolchainIdentifiers := toolchainToCToolchainIdentifier(crosstool)

	toolchainToFeatures, featureNameToFeature, err := getFeatures(crosstool)
	if err != nil {
		return "", err
	}

	toolchainToActions, actionNameToAction, err := getActions(crosstool)
	if err != nil {
		return "", err
	}

	header := getCcToolchainConfigHeader()
	if _, err := b.WriteString(header); err != nil {
		return "", err
	}

	loadActionsStmt := getLoadActionsStmt()
	if _, err := b.WriteString(loadActionsStmt); err != nil {
		return "", err
	}

	implHeader := getImplHeader()
	if _, err := b.WriteString(implHeader); err != nil {
		return "", err
	}

	stringFields := []string{
		"toolchain_identifier",
		"host_system_name",
		"target_system_name",
		"target_cpu",
		"target_libc",
		"compiler",
		"abi_version",
		"abi_libc_version",
		"cc_target_os",
		"builtin_sysroot",
	}

	for _, stringField := range stringFields {
		stmt := getStringStatement(crosstool, cToolchainIdentifiers, stringField, 1)
		if _, err := b.WriteString(stmt); err != nil {
			return "", err
		}
	}

	listsOfActions := []string{
		"all_compile_actions",
		"all_cpp_compile_actions",
		"preprocessor_compile_actions",
		"codegen_compile_actions",
		"all_link_actions",
	}

	for _, listOfActions := range listsOfActions {
		actions := getListOfActions(listOfActions, 1)
		if _, err := b.WriteString(actions); err != nil {
			return "", err
		}
	}

	actionConfigDeclaration := getActionConfigsDeclaration(
		crosstool, cToolchainIdentifiers, actionNameToAction, 1)
	if _, err := b.WriteString(actionConfigDeclaration); err != nil {
		return "", err
	}

	actionConfigStatement := getActionConfigsStmt(
		cToolchainIdentifiers, toolchainToActions, 1)
	if _, err := b.WriteString(actionConfigStatement); err != nil {
		return "", err
	}

	featureDeclaration := getFeaturesDeclaration(
		crosstool, cToolchainIdentifiers, featureNameToFeature, 1)
	if _, err := b.WriteString(featureDeclaration); err != nil {
		return "", err
	}

	featuresStatement := getFeaturesStmt(
		cToolchainIdentifiers, toolchainToFeatures, 1)
	if _, err := b.WriteString(featuresStatement); err != nil {
		return "", err
	}

	includeDirectories := getStringArr(
		crosstool, cToolchainIdentifiers, "cxx_builtin_include_directories", 1)
	if _, err := b.WriteString(includeDirectories); err != nil {
		return "", err
	}

	artifactNamePatterns := getArtifactNamePatterns(
		crosstool, cToolchainIdentifiers, 1)
	if _, err := b.WriteString(artifactNamePatterns); err != nil {
		return "", err
	}

	makeVariables := getMakeVariables(crosstool, cToolchainIdentifiers, 1)
	if _, err := b.WriteString(makeVariables); err != nil {
		return "", err
	}

	toolPaths := getToolPaths(crosstool, cToolchainIdentifiers, 1)
	if _, err := b.WriteString(toolPaths); err != nil {
		return "", err
	}

	if _, err := b.WriteString(getReturnStatement()); err != nil {
		return "", err
	}

	rule := getRule(cToolchainIdentifiers, getCompilers(crosstool))
	if _, err := b.WriteString(rule); err != nil {
		return "", err
	}

	return b.String(), nil
}