/**
* Returns the xcode version number corresponding to the {@code --xcode_version} flag, if there is
* an available {@code xcode_version} target which recognizes the flag value as either an official
* version or an alias. Returns null if no such target is found.
*/
@Nullable
private DottedVersion resolveExplicitlyDefinedVersion(RuleContext ruleContext) {
AppleConfiguration configuration = ruleContext.getFragment(AppleConfiguration.class);
Optional<DottedVersion> versionOverrideFlag = configuration.getXcodeVersionOverrideFlag();
if (versionOverrideFlag.isPresent()) {
// The version override flag is not necessarily an actual version - it may be a version
// alias.
DottedVersion explicitVerison =
aliasesToVersionMap(ruleContext).get(versionOverrideFlag.get().toString());
if (explicitVerison != null) {
return explicitVerison;
}
} else { // No override specified. Use default.
XcodeVersionProvider defaultProvider =
ruleContext.getPrerequisite(
XcodeConfigRule.DEFAULT_ATTR_NAME, Mode.TARGET, XcodeVersionProvider.class);
if (defaultProvider != null) {
return defaultProvider.getVersion();
}
}
boolean requireDefinedVersions =
ruleContext.attributes().get(XcodeConfigRule.REQUIRE_DEFINED_VERSIONS_ATTR_NAME, BOOLEAN);
if (requireDefinedVersions) {
ruleContext.ruleError(
"xcode version config required an explicitly defined version, but none was available");
}
return null;
}
private static Map<String, DottedVersion> aliasesToVersionMap(RuleContext ruleContext) {
Iterable<XcodeVersionProvider> xcodeVersionProviders =
ruleContext.getPrerequisites(
XcodeConfigRule.VERSIONS_ATTR_NAME, Mode.TARGET, XcodeVersionProvider.class);
Map<String, DottedVersion> aliasesToVersionMap = Maps.newLinkedHashMap();
for (XcodeVersionProvider versionProvider : xcodeVersionProviders) {
for (String alias : versionProvider.getAliases()) {
if (aliasesToVersionMap.put(alias, versionProvider.getVersion()) != null) {
ruleErrorDuplicateAlias(alias, ruleContext);
}
}
if (aliasesToVersionMap.put(
versionProvider.getVersion().toString(), versionProvider.getVersion())
!= null) {
ruleErrorDuplicateAlias(versionProvider.getVersion().toString(), ruleContext);
}
}
return aliasesToVersionMap;
}
private static void ruleErrorDuplicateAlias(String alias, RuleContext ruleContext) {
Iterable<XcodeVersionProvider> xcodeVersionProviders =
ruleContext.getPrerequisites(
XcodeConfigRule.VERSIONS_ATTR_NAME, Mode.TARGET, XcodeVersionProvider.class);
ImmutableList.Builder<Label> labelsContainingAlias = ImmutableList.builder();
for (XcodeVersionProvider versionProvider : xcodeVersionProviders) {
if (versionProvider.getAliases().contains(alias)
|| versionProvider.getVersion().toString().equals(alias)) {
labelsContainingAlias.add(versionProvider.getLabel());
}
}
ruleContext.ruleError(
String.format(
"'%s' is registered to multiple labels (%s) in a single xcode version "
+ "configuration",
alias, Joiner.on(", ").join(labelsContainingAlias.build())));
}