Removed fixed dependencies

packages/analyzer/lib/src/task/options.dart

Index: packages/analyzer/lib/src/task/options.dart
diff --git a/packages/analyzer/lib/src/task/options.dart b/packages/analyzer/lib/src/task/options.dart
new file mode 100644
index 0000000000000000000000000000000000000000..4047b3b84c244a407b79b3e8e82179c711eed3dd
--- /dev/null
+++ b/packages/analyzer/lib/src/task/options.dart
@@ -0,0 +1,621 @@
+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+library analyzer.src.task.options;
+
+import 'dart:collection';
+
+import 'package:analyzer/analyzer.dart';
+import 'package:analyzer/plugin/options.dart';
+import 'package:analyzer/source/analysis_options_provider.dart';
+import 'package:analyzer/source/error_processor.dart';
+import 'package:analyzer/src/context/context.dart';
+import 'package:analyzer/src/generated/engine.dart';
+import 'package:analyzer/src/generated/java_engine.dart';
+import 'package:analyzer/src/generated/source.dart';
+import 'package:analyzer/src/generated/utilities_general.dart';
+import 'package:analyzer/src/task/general.dart';
+import 'package:analyzer/src/util/yaml.dart';
+import 'package:analyzer/task/general.dart';
+import 'package:analyzer/task/model.dart';
+import 'package:source_span/source_span.dart';
+import 'package:yaml/yaml.dart';
+
+/// The errors produced while parsing an analysis options file.
+///
+/// The list will be empty if there were no errors, but will not be `null`.
+final ListResultDescriptor<AnalysisError> ANALYSIS_OPTIONS_ERRORS =
+    new ListResultDescriptor<AnalysisError>(
+        'ANALYSIS_OPTIONS_ERRORS', AnalysisError.NO_ERRORS);
+
+/**
+ * The descriptor used to associate error processors with analysis contexts in
+ * configuration data.
+ */
+final ListResultDescriptor<ErrorProcessor> CONFIGURED_ERROR_PROCESSORS =
+    new ListResultDescriptor<ErrorProcessor>(
+        'configured.errors', const <ErrorProcessor>[]);
+
+final _OptionsProcessor _processor = new _OptionsProcessor();
+
+void applyToAnalysisOptions(
+    AnalysisOptionsImpl options, Map<String, Object> optionMap) {
+  _processor.applyToAnalysisOptions(options, optionMap);
+}
+
+/// Configure this [context] based on configuration details specified in
+/// the given [options].  If [options] is `null`, default values are applied.
+void configureContextOptions(
+        AnalysisContext context, Map<String, Object> options) =>
+    _processor.configure(context, options);
+
+/// `analyzer` analysis options constants.
+class AnalyzerOptions {
+  static const String analyzer = 'analyzer';
+  static const String enableAssertInitializer = 'enableAssertInitializer';
+  static const String enableAsync = 'enableAsync';
+  static const String enableGenericMethods = 'enableGenericMethods';
+  static const String enableInitializingFormalAccess =
+      'enableInitializingFormalAccess';
+  static const String enableStrictCallChecks = 'enableStrictCallChecks';
+  static const String enableSuperMixins = 'enableSuperMixins';
+
+  static const String errors = 'errors';
+  static const String exclude = 'exclude';
+  static const String language = 'language';
+  static const String plugins = 'plugins';
+  static const String strong_mode = 'strong-mode';
+
+  // Strong mode options, see AnalysisOptionsImpl for documentation.
+  static const String implicitCasts = 'implicit-casts';
+  static const String implicitDynamic = 'implicit-dynamic';
+
+  /// Ways to say `ignore`.
+  static const List<String> ignoreSynonyms = const ['ignore', 'false'];
+
+  /// Valid error `severity`s.
+  static final List<String> severities =
+      new List.unmodifiable(severityMap.keys);
+
+  /// Ways to say `include`.
+  static const List<String> includeSynonyms = const ['include', 'true'];
+
+  /// Ways to say `true` or `false`.
+  static const List<String> trueOrFalse = const ['true', 'false'];
+
+  /// Supported top-level `analyzer` options.
+  static const List<String> topLevel = const [
+    errors,
+    exclude,
+    language,
+    plugins,
+    strong_mode
+  ];
+
+  /// Supported `analyzer` language configuration options.
+  static const List<String> languageOptions = const [
+    enableAssertInitializer,
+    enableAsync,
+    enableGenericMethods,
+    enableStrictCallChecks,
+    enableSuperMixins
+  ];
+}
+
+/// Validates `analyzer` options.
+class AnalyzerOptionsValidator extends CompositeValidator {
+  AnalyzerOptionsValidator()
+      : super([
+          new TopLevelAnalyzerOptionsValidator(),
+          new StrongModeOptionValueValidator(),
+          new ErrorFilterOptionValidator(),
+          new LanguageOptionValidator()
+        ]);
+}
+
+/// Convenience class for composing validators.
+class CompositeValidator extends OptionsValidator {
+  final List<OptionsValidator> validators;
+  CompositeValidator(this.validators);
+
+  @override
+  void validate(ErrorReporter reporter, Map<String, YamlNode> options) =>
+      validators.forEach((v) => v.validate(reporter, options));
+}
+
+/// Builds error reports with value proposals.
+class ErrorBuilder {
+  String proposal;
+  AnalysisOptionsWarningCode code;
+
+  /// Create a builder for the given [supportedOptions].
+  ErrorBuilder(List<String> supportedOptions) {
+    assert(supportedOptions != null && !supportedOptions.isEmpty);
+    if (supportedOptions.length > 1) {
+      proposal = StringUtilities.printListOfQuotedNames(supportedOptions);
+      code = pluralProposalCode;
+    } else {
+      proposal = "'${supportedOptions.join()}'";
+      code = singularProposalCode;
+    }
+  }
+  AnalysisOptionsWarningCode get pluralProposalCode =>
+      AnalysisOptionsWarningCode.UNSUPPORTED_OPTION_WITH_LEGAL_VALUES;
+
+  AnalysisOptionsWarningCode get singularProposalCode =>
+      AnalysisOptionsWarningCode.UNSUPPORTED_OPTION_WITH_LEGAL_VALUE;
+
+  /// Report an unsupported [node] value, defined in the given [scopeName].
+  void reportError(ErrorReporter reporter, String scopeName, YamlNode node) {
+    reporter
+        .reportErrorForSpan(code, node.span, [scopeName, node.value, proposal]);
+  }
+}
+
+/// Validates `analyzer` error filter options.
+class ErrorFilterOptionValidator extends OptionsValidator {
+  /// Legal values.
+  static final List<String> legalValues =
+      new List.from(AnalyzerOptions.ignoreSynonyms)
+        ..addAll(AnalyzerOptions.includeSynonyms)
+        ..addAll(AnalyzerOptions.severities);
+
+  /// Pretty String listing legal values.
+  static final String legalValueString =
+      StringUtilities.printListOfQuotedNames(legalValues);
+
+  /// Lazily populated set of error codes (hashed for speedy lookup).
+  static HashSet<String> _errorCodes;
+
+  /// Legal error code names.
+  static Set<String> get errorCodes {
+    if (_errorCodes == null) {
+      _errorCodes = new HashSet<String>();
+      // Engine codes.
+      _errorCodes.addAll(ErrorCode.values.map((ErrorCode code) => code.name));
+    }
+    return _errorCodes;
+  }
+
+  @override
+  void validate(ErrorReporter reporter, Map<String, YamlNode> options) {
+    var analyzer = options[AnalyzerOptions.analyzer];
+    if (analyzer is YamlMap) {
+      var filters = analyzer[AnalyzerOptions.errors];
+      if (filters is YamlMap) {
+        String value;
+        filters.nodes.forEach((k, v) {
+          if (k is YamlScalar) {
+            value = toUpperCase(k.value);
+            if (!errorCodes.contains(value)) {
+              reporter.reportErrorForSpan(
+                  AnalysisOptionsWarningCode.UNRECOGNIZED_ERROR_CODE,
+                  k.span,
+                  [k.value?.toString()]);
+            }
+          }
+          if (v is YamlScalar) {
+            value = toLowerCase(v.value);
+            if (!legalValues.contains(value)) {
+              reporter.reportErrorForSpan(
+                  AnalysisOptionsWarningCode
+                      .UNSUPPORTED_OPTION_WITH_LEGAL_VALUES,
+                  v.span,
+                  [
+                    AnalyzerOptions.errors,
+                    v.value?.toString(),
+                    legalValueString
+                  ]);
+            }
+          }
+        });
+      }
+    }
+  }
+}
+
+/// A task that generates errors for an analysis options file.
+class GenerateOptionsErrorsTask extends SourceBasedAnalysisTask {
+  /// The name of the input whose value is the content of the file.
+  static const String CONTENT_INPUT_NAME = 'CONTENT_INPUT_NAME';
+
+  /// The task descriptor describing this kind of task.
+  static final TaskDescriptor DESCRIPTOR = new TaskDescriptor(
+      'GenerateOptionsErrorsTask',
+      createTask,
+      buildInputs,
+      <ResultDescriptor>[ANALYSIS_OPTIONS_ERRORS, LINE_INFO],
+      suitabilityFor: suitabilityFor);
+
+  final AnalysisOptionsProvider optionsProvider = new AnalysisOptionsProvider();
+
+  GenerateOptionsErrorsTask(AnalysisContext context, AnalysisTarget target)
+      : super(context, target);
+
+  @override
+  TaskDescriptor get descriptor => DESCRIPTOR;
+
+  Source get source => target.source;
+
+  @override
+  void internalPerform() {
+    String content = getRequiredInput(CONTENT_INPUT_NAME);
+
+    List<AnalysisError> errors = <AnalysisError>[];
+
+    try {
+      Map<String, YamlNode> options =
+          optionsProvider.getOptionsFromString(content);
+      errors.addAll(_validate(options));
+    } on OptionsFormatException catch (e) {
+      SourceSpan span = e.span;
+      var error = new AnalysisError(source, span.start.column + 1, span.length,
+          AnalysisOptionsErrorCode.PARSE_ERROR, [e.message]);
+      errors.add(error);
+    }
+
+    //
+    // Record outputs.
+    //
+    outputs[ANALYSIS_OPTIONS_ERRORS] = errors;
+    outputs[LINE_INFO] = computeLineInfo(content);
+  }
+
+  List<AnalysisError> _validate(Map<String, YamlNode> options) =>
+      new OptionsFileValidator(source).validate(options);
+
+  /// Return a map from the names of the inputs of this kind of task to the
+  /// task input descriptors describing those inputs for a task with the
+  /// given [target].
+  static Map<String, TaskInput> buildInputs(AnalysisTarget source) =>
+      <String, TaskInput>{CONTENT_INPUT_NAME: CONTENT.of(source)};
+
+  /// Compute [LineInfo] for the given [content].
+  static LineInfo computeLineInfo(String content) {
+    List<int> lineStarts = StringUtilities.computeLineStarts(content);
+    return new LineInfo(lineStarts);
+  }
+
+  /// Create a task based on the given [target] in the given [context].
+  static GenerateOptionsErrorsTask createTask(
+          AnalysisContext context, AnalysisTarget target) =>
+      new GenerateOptionsErrorsTask(context, target);
+
+  /**
+   * Return an indication of how suitable this task is for the given [target].
+   */
+  static TaskSuitability suitabilityFor(AnalysisTarget target) {
+    if (target is Source &&
+        (target.shortName == AnalysisEngine.ANALYSIS_OPTIONS_FILE ||
+            target.shortName == AnalysisEngine.ANALYSIS_OPTIONS_YAML_FILE)) {
+      return TaskSuitability.HIGHEST;
+    }
+    return TaskSuitability.NONE;
+  }
+}
+
+/// Validates `analyzer` language configuration options.
+class LanguageOptionValidator extends OptionsValidator {
+  ErrorBuilder builder = new ErrorBuilder(AnalyzerOptions.languageOptions);
+  ErrorBuilder trueOrFalseBuilder = new TrueOrFalseValueErrorBuilder();
+
+  @override
+  void validate(ErrorReporter reporter, Map<String, YamlNode> options) {
+    var analyzer = options[AnalyzerOptions.analyzer];
+    if (analyzer is YamlMap) {
+      var language = analyzer[AnalyzerOptions.language];
+      if (language is YamlMap) {
+        language.nodes.forEach((k, v) {
+          String key, value;
+          bool validKey = false;
+          if (k is YamlScalar) {
+            key = k.value?.toString();
+            if (!AnalyzerOptions.languageOptions.contains(key)) {
+              builder.reportError(reporter, AnalyzerOptions.language, k);
+            } else {
+              // If we have a valid key, go on and check the value.
+              validKey = true;
+            }
+          }
+          if (validKey && v is YamlScalar) {
+            value = toLowerCase(v.value);
+            if (!AnalyzerOptions.trueOrFalse.contains(value)) {
+              trueOrFalseBuilder.reportError(reporter, key, v);
+            }
+          }
+        });
+      }
+    }
+  }
+}
+
+/// Validates `linter` top-level options.
+/// TODO(pq): move into `linter` package and plugin.
+class LinterOptionsValidator extends TopLevelOptionValidator {
+  LinterOptionsValidator() : super('linter', const ['rules']);
+}
+
+/// Validates options defined in an analysis options file.
+class OptionsFileValidator {
+  // TODO(pq): move to an extension point.
+  final List<OptionsValidator> _validators = [
+    new AnalyzerOptionsValidator(),
+    new LinterOptionsValidator()
+  ];
+
+  final Source source;
+  OptionsFileValidator(this.source) {
+    _validators.addAll(AnalysisEngine.instance.optionsPlugin.optionsValidators);
+  }
+
+  List<AnalysisError> validate(Map<String, YamlNode> options) {
+    RecordingErrorListener recorder = new RecordingErrorListener();
+    ErrorReporter reporter = new ErrorReporter(recorder, source);
+    _validators.forEach((OptionsValidator v) => v.validate(reporter, options));
+    return recorder.errors;
+  }
+}
+
+/// Validates `analyzer` strong-mode value configuration options.
+class StrongModeOptionValueValidator extends OptionsValidator {
+  ErrorBuilder trueOrFalseBuilder = new TrueOrFalseValueErrorBuilder();
+
+  @override
+  void validate(ErrorReporter reporter, Map<String, YamlNode> options) {
+    var analyzer = options[AnalyzerOptions.analyzer];
+    if (analyzer is YamlMap) {
+      var v = analyzer.nodes[AnalyzerOptions.strong_mode];
+      if (v is YamlScalar) {
+        var value = toLowerCase(v.value);
+        if (!AnalyzerOptions.trueOrFalse.contains(value)) {
+          trueOrFalseBuilder.reportError(
+              reporter, AnalyzerOptions.strong_mode, v);
+        }
+      }
+    }
+  }
+}
+
+/// Validates `analyzer` top-level options.
+class TopLevelAnalyzerOptionsValidator extends TopLevelOptionValidator {
+  TopLevelAnalyzerOptionsValidator()
+      : super(AnalyzerOptions.analyzer, AnalyzerOptions.topLevel);
+}
+
+/// Validates top-level options. For example,
+///     plugin:
+///       top-level-option: true
+class TopLevelOptionValidator extends OptionsValidator {
+  final String pluginName;
+  final List<String> supportedOptions;
+  String _valueProposal;
+  AnalysisOptionsWarningCode _warningCode;
+  TopLevelOptionValidator(this.pluginName, this.supportedOptions) {
+    assert(supportedOptions != null && !supportedOptions.isEmpty);
+    if (supportedOptions.length > 1) {
+      _valueProposal = StringUtilities.printListOfQuotedNames(supportedOptions);
+      _warningCode =
+          AnalysisOptionsWarningCode.UNSUPPORTED_OPTION_WITH_LEGAL_VALUES;
+    } else {
+      _valueProposal = "'${supportedOptions.join()}'";
+      _warningCode =
+          AnalysisOptionsWarningCode.UNSUPPORTED_OPTION_WITH_LEGAL_VALUE;
+    }
+  }
+
+  @override
+  void validate(ErrorReporter reporter, Map<String, YamlNode> options) {
+    YamlNode node = options[pluginName];
+    if (node is YamlMap) {
+      node.nodes.forEach((k, v) {
+        if (k is YamlScalar) {
+          if (!supportedOptions.contains(k.value)) {
+            reporter.reportErrorForSpan(
+                _warningCode, k.span, [pluginName, k.value, _valueProposal]);
+          }
+        }
+        //TODO(pq): consider an error if the node is not a Scalar.
+      });
+    }
+  }
+}
+
+/// An error-builder that knows about `true` and `false` legal values.
+class TrueOrFalseValueErrorBuilder extends ErrorBuilder {
+  TrueOrFalseValueErrorBuilder() : super(AnalyzerOptions.trueOrFalse);
+  @override
+  AnalysisOptionsWarningCode get pluralProposalCode =>
+      AnalysisOptionsWarningCode.UNSUPPORTED_VALUE;
+}
+
+class _OptionsProcessor {
+  static final Map<String, Object> defaults = {'analyzer': {}};
+
+  /**
+   * Apply the options in the given [optionMap] to the given analysis [options].
+   */
+  void applyToAnalysisOptions(
+      AnalysisOptionsImpl options, Map<String, Object> optionMap) {
+    if (optionMap == null) {
+      return;
+    }
+    var analyzer = optionMap[AnalyzerOptions.analyzer];
+    if (analyzer is Map) {
+      // Process strong mode option.
+      var strongMode = analyzer[AnalyzerOptions.strong_mode];
+      _applyStrongOptions(options, strongMode);
+
+      // Process language options.
+      var language = analyzer[AnalyzerOptions.language];
+      _applyLanguageOptions(options, language);
+    }
+  }
+
+  /// Configure [context] based on the given [options] (which can be `null`
+  /// to restore [defaults]).
+  void configure(AnalysisContext context, Map<String, Object> options) {
+    if (options == null) {
+      options = defaults;
+    }
+
+    var analyzer = options[AnalyzerOptions.analyzer];
+    if (analyzer is Map) {
+      // Set strong mode (default is false).
+      var strongMode = analyzer[AnalyzerOptions.strong_mode];
+      setStrongMode(context, strongMode);
+
+      // Set filters.
+      var filters = analyzer[AnalyzerOptions.errors];
+      setProcessors(context, filters);
+
+      // Process language options.
+      var language = analyzer[AnalyzerOptions.language];
+      setLanguageOptions(context, language);
+
+      // Process excludes.
+      var excludes = analyzer[AnalyzerOptions.exclude];
+      setExcludes(context, excludes);
+    }
+  }
+
+  void setExcludes(AnalysisContext context, Object excludes) {
+    if (excludes is YamlList) {
+      List<String> excludeList = toStringList(excludes);
+      if (excludeList != null) {
+        context.setConfigurationData(CONTEXT_EXCLUDES, excludeList);
+      }
+    }
+  }
+
+  void setLanguageOption(
+      AnalysisContext context, Object feature, Object value) {
+    if (feature == AnalyzerOptions.enableAssertInitializer) {
+      if (isTrue(value)) {
+        AnalysisOptionsImpl options =
+            new AnalysisOptionsImpl.from(context.analysisOptions);
+        options.enableAssertInitializer = true;
+        context.analysisOptions = options;
+      }
+    }
+    if (feature == AnalyzerOptions.enableStrictCallChecks) {
+      if (isTrue(value)) {
+        AnalysisOptionsImpl options =
+            new AnalysisOptionsImpl.from(context.analysisOptions);
+        options.enableStrictCallChecks = true;
+        context.analysisOptions = options;
+      }
+    }
+    if (feature == AnalyzerOptions.enableSuperMixins) {
+      if (isTrue(value)) {
+        AnalysisOptionsImpl options =
+            new AnalysisOptionsImpl.from(context.analysisOptions);
+        options.enableSuperMixins = true;
+        context.analysisOptions = options;
+      }
+    }
+    if (feature == AnalyzerOptions.enableGenericMethods) {
+      if (isTrue(value)) {
+        AnalysisOptionsImpl options =
+            new AnalysisOptionsImpl.from(context.analysisOptions);
+        options.enableGenericMethods = true;
+        context.analysisOptions = options;
+      }
+    }
+  }
+
+  void setLanguageOptions(AnalysisContext context, Object configs) {
+    if (configs is YamlMap) {
+      configs.nodes.forEach((k, v) {
+        if (k is YamlScalar && v is YamlScalar) {
+          String feature = k.value?.toString();
+          setLanguageOption(context, feature, v.value);
+        }
+      });
+    } else if (configs is Map) {
+      configs.forEach((k, v) => setLanguageOption(context, k, v));
+    }
+  }
+
+  void setProcessors(AnalysisContext context, Object codes) {
+    ErrorConfig config = new ErrorConfig(codes);
+    context.setConfigurationData(
+        CONFIGURED_ERROR_PROCESSORS, config.processors);
+  }
+
+  void setStrongMode(AnalysisContext context, Object strongMode) {
+    if (strongMode is Map) {
+      AnalysisOptionsImpl options =
+          new AnalysisOptionsImpl.from(context.analysisOptions);
+      _applyStrongOptions(options, strongMode);
+      context.analysisOptions = options;
+    } else {
+      strongMode = strongMode is bool ? strongMode : false;
+      if (context.analysisOptions.strongMode != strongMode) {
+        AnalysisOptionsImpl options =
+            new AnalysisOptionsImpl.from(context.analysisOptions);
+        options.strongMode = strongMode;
+        context.analysisOptions = options;
+      }
+    }
+  }
+
+  void _applyLanguageOption(
+      AnalysisOptionsImpl options, Object feature, Object value) {
+    bool boolValue = toBool(value);
+    if (boolValue != null) {
+      if (feature == AnalyzerOptions.enableAssertInitializer) {
+        options.enableAssertInitializer = boolValue;
+      } else if (feature == AnalyzerOptions.enableInitializingFormalAccess) {
+        options.enableInitializingFormalAccess = boolValue;
+      } else if (feature == AnalyzerOptions.enableSuperMixins) {
+        options.enableSuperMixins = boolValue;
+      } else if (feature == AnalyzerOptions.enableGenericMethods) {
+        options.enableGenericMethods = boolValue;
+      }
+    }
+  }
+
+  void _applyLanguageOptions(AnalysisOptionsImpl options, Object configs) {
+    if (configs is YamlMap) {
+      configs.nodes.forEach((key, value) {
+        if (key is YamlScalar && value is YamlScalar) {
+          String feature = key.value?.toString();
+          _applyLanguageOption(options, feature, value.value);
+        }
+      });
+    } else if (configs is Map) {
+      configs
+          .forEach((key, value) => _applyLanguageOption(options, key, value));
+    }
+  }
+
+  void _applyStrongModeOption(
+      AnalysisOptionsImpl options, Object feature, Object value) {
+    bool boolValue = toBool(value);
+    if (boolValue != null) {
+      if (feature == AnalyzerOptions.implicitCasts) {
+        options.implicitCasts = boolValue;
+      }
+      if (feature == AnalyzerOptions.implicitDynamic) {
+        options.implicitDynamic = boolValue;
+      }
+    }
+  }
+
+  void _applyStrongOptions(AnalysisOptionsImpl options, Object config) {
+    if (config is YamlMap) {
+      options.strongMode = true;
+      config.nodes.forEach((k, v) {
+        if (k is YamlScalar && v is YamlScalar) {
+          _applyStrongModeOption(options, k.value?.toString(), v.value);
+        }
+      });
+    } else if (config is Map) {
+      options.strongMode = true;
+      config.forEach((k, v) => _applyStrongModeOption(options, k, v));
+    } else {
+      options.strongMode = config is bool ? config : false;
+    }
+  }
+}