Examples with SkylarkCallbackFunction com.google.devtools.build.lib.syntax.SkylarkCallbackFunction used on opensource projects

Example 1 with SkylarkCallbackFunction

use of com.google.devtools.build.lib.syntax.SkylarkCallbackFunction in project bazel by bazelbuild.

the class SkylarkAttr method createAttribute.

private static Attribute.Builder<?> createAttribute(Type<?> type, SkylarkDict<String, Object> arguments, FuncallExpression ast, Environment env) throws EvalException, ConversionException {
    // We use an empty name now so that we can set it later.
    // This trick makes sense only in the context of Skylark (builtin rules should not use it).
    Attribute.Builder<?> builder = Attribute.attr("", type);
    Object defaultValue = arguments.get(DEFAULT_ARG);
    if (!EvalUtils.isNullOrNone(defaultValue)) {
        if (defaultValue instanceof UserDefinedFunction) {
            // Computed attribute. Non label type attributes already caused a type check error.
            SkylarkCallbackFunction callback = new SkylarkCallbackFunction((UserDefinedFunction) defaultValue, ast, env);
            // SkylarkComputedDefaultTemplate needs to know the names of all attributes that it depends
            // on. However, this method does not know anything about other attributes.
            // We solve this problem by asking the SkylarkCallbackFunction for the parameter names used
            // in the function definition, which must be the names of attributes used by the callback.
            builder.value(new SkylarkComputedDefaultTemplate(type, callback.getParameterNames(), callback, ast.getLocation()));
        } else {
            builder.defaultValue(defaultValue, env.getGlobals().label());
        }
    }
    for (String flag : SkylarkList.castSkylarkListOrNoneToList(arguments.get(FLAGS_ARG), String.class, FLAGS_ARG)) {
        builder.setPropertyFlag(flag);
    }
    if (containsNonNoneKey(arguments, MANDATORY_ARG) && (Boolean) arguments.get(MANDATORY_ARG)) {
        builder.setPropertyFlag("MANDATORY");
    }
    // TODO(laurentlb): Deprecated, remove in August 2016 (use allow_empty instead).
    if (containsNonNoneKey(arguments, NON_EMPTY_ARG) && (Boolean) arguments.get(NON_EMPTY_ARG)) {
        builder.setPropertyFlag("NON_EMPTY");
    }
    if (containsNonNoneKey(arguments, ALLOW_EMPTY_ARG) && !(Boolean) arguments.get(ALLOW_EMPTY_ARG)) {
        builder.setPropertyFlag("NON_EMPTY");
    }
    if (containsNonNoneKey(arguments, EXECUTABLE_ARG) && (Boolean) arguments.get(EXECUTABLE_ARG)) {
        builder.setPropertyFlag("EXECUTABLE");
        if (!containsNonNoneKey(arguments, CONFIGURATION_ARG)) {
            throw new EvalException(ast.getLocation(), "cfg parameter is mandatory when executable=True is provided. Please see " + "https://www.bazel.build/versions/master/docs/skylark/rules.html#configurations " + "for more details.");
        }
    }
    // TODO(laurentlb): Deprecated, remove in August 2016 (use allow_single_file).
    if (containsNonNoneKey(arguments, SINGLE_FILE_ARG) && (Boolean) arguments.get(SINGLE_FILE_ARG)) {
        if (containsNonNoneKey(arguments, ALLOW_SINGLE_FILE_ARG)) {
            throw new EvalException(ast.getLocation(), "Cannot specify both single_file (deprecated) and allow_single_file");
        }
        builder.setPropertyFlag("SINGLE_ARTIFACT");
    }
    if (containsNonNoneKey(arguments, ALLOW_FILES_ARG) && containsNonNoneKey(arguments, ALLOW_SINGLE_FILE_ARG)) {
        throw new EvalException(ast.getLocation(), "Cannot specify both allow_files and allow_single_file");
    }
    if (containsNonNoneKey(arguments, ALLOW_FILES_ARG)) {
        Object fileTypesObj = arguments.get(ALLOW_FILES_ARG);
        setAllowedFileTypes(ALLOW_FILES_ARG, fileTypesObj, ast, builder);
    } else if (containsNonNoneKey(arguments, ALLOW_SINGLE_FILE_ARG)) {
        Object fileTypesObj = arguments.get(ALLOW_SINGLE_FILE_ARG);
        setAllowedFileTypes(ALLOW_SINGLE_FILE_ARG, fileTypesObj, ast, builder);
        builder.setPropertyFlag("SINGLE_ARTIFACT");
    } else if (type.getLabelClass() == LabelClass.DEPENDENCY) {
        builder.allowedFileTypes(FileTypeSet.NO_FILE);
    }
    Object ruleClassesObj = arguments.get(ALLOW_RULES_ARG);
    if (ruleClassesObj != null && ruleClassesObj != Runtime.NONE) {
        builder.allowedRuleClasses(SkylarkList.castSkylarkListOrNoneToList(ruleClassesObj, String.class, "allowed rule classes for attribute definition"));
    }
    List<Object> values = SkylarkList.castSkylarkListOrNoneToList(arguments.get(VALUES_ARG), Object.class, VALUES_ARG);
    if (!Iterables.isEmpty(values)) {
        builder.allowedValues(new AllowedValueSet(values));
    }
    if (containsNonNoneKey(arguments, PROVIDERS_ARG)) {
        Object obj = arguments.get(PROVIDERS_ARG);
        SkylarkType.checkType(obj, SkylarkList.class, PROVIDERS_ARG);
        ImmutableList<ImmutableSet<SkylarkProviderIdentifier>> providersList = buildProviderPredicate((SkylarkList<?>) obj, PROVIDERS_ARG, ast.getLocation());
        builder.mandatoryProvidersList(providersList);
    }
    if (containsNonNoneKey(arguments, CONFIGURATION_ARG)) {
        Object trans = arguments.get(CONFIGURATION_ARG);
        if (trans.equals("data")) {
            builder.cfg(ConfigurationTransition.DATA);
        } else if (trans.equals("host")) {
            builder.cfg(ConfigurationTransition.HOST);
        } else if (trans instanceof SplitTransition<?>) {
            builder.cfg((SplitTransition<?>) trans);
        } else if (!trans.equals("target")) {
            throw new EvalException(ast.getLocation(), "cfg must be either 'data', 'host', or 'target'.");
        }
    }
    if (containsNonNoneKey(arguments, ASPECTS_ARG)) {
        Object obj = arguments.get(ASPECTS_ARG);
        SkylarkType.checkType(obj, SkylarkList.class, ASPECTS_ARG);
        List<SkylarkAspect> aspects = ((SkylarkList<?>) obj).getContents(SkylarkAspect.class, "aspects");
        for (SkylarkAspect aspect : aspects) {
            builder.aspect(aspect, ast.getLocation());
        }
    }
    return builder;
}