| // Copyright (c) 2016, 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. |
| |
| import 'package:analyzer/src/generated/utilities_dart.dart'; |
| import 'package:analyzer/src/summary/format.dart'; |
| import 'package:analyzer/src/summary/idl.dart'; |
| import 'package:analyzer/src/summary/name_filter.dart'; |
| |
| /** |
| * Create a [LinkedLibraryBuilder] corresponding to the given [definingUnitUri] |
| * and [definingUnit], which should be the defining compilation unit for a |
| * library. Compilation units referenced by the defining compilation unit via |
| * `part` declarations will be retrieved using [getPart]. Public namespaces |
| * for libraries referenced by the defining compilation unit via `import` |
| * declarations (and files reachable from them via `part` and `export` |
| * declarations) will be retrieved using [getImport]. |
| */ |
| LinkedLibraryBuilder prelink( |
| String definingUnitUri, |
| UnlinkedUnit definingUnit, |
| GetPartCallback getPart, |
| GetImportCallback getImport, |
| GetDeclaredVariable getDeclaredVariable) { |
| return new _Prelinker(definingUnitUri, definingUnit, getPart, getImport, |
| getDeclaredVariable) |
| .prelink(); |
| } |
| |
| /** |
| * Return the raw string value of the variable with the given [name], |
| * or `null` of the variable is not defined. |
| */ |
| typedef String GetDeclaredVariable(String name); |
| |
| /** |
| * Type of the callback used by the prelinker to obtain public namespace |
| * information about libraries with the given [absoluteUri] imported by the |
| * library to be prelinked (and the transitive closure of parts and exports |
| * reachable from those libraries). |
| * |
| * If no file exists at the given uri, `null` should be returned. |
| */ |
| typedef UnlinkedPublicNamespace GetImportCallback(String absoluteUri); |
| |
| /** |
| * Type of the callback used by the prelinker to obtain unlinked summaries of |
| * part files of the library to be prelinked. |
| * |
| * If no file exists at the given uri, `null` should be returned. |
| */ |
| typedef UnlinkedUnit GetPartCallback(String absoluteUri); |
| |
| /** |
| * A [_Meaning] representing a class. |
| */ |
| class _ClassMeaning extends _Meaning { |
| final _Namespace namespace; |
| |
| _ClassMeaning(int unit, int dependency, int numTypeParameters, this.namespace) |
| : super(unit, ReferenceKind.classOrEnum, dependency, numTypeParameters); |
| } |
| |
| /** |
| * A node in computing exported namespaces. |
| */ |
| class _ExportNamespace { |
| static int nextId = 0; |
| |
| /** |
| * The export namespace, full (with all exports included), or partial (with |
| * public namespace, and only some of the exports included). |
| */ |
| final _Namespace namespace; |
| |
| /** |
| * This field is set to non-zero when we start computing the export namespace |
| * for the corresponding library, and is set back to zero when we finish |
| * computation. |
| */ |
| int id = 0; |
| |
| /** |
| * Whether the [namespace] is full, so we don't need chasing exports. |
| */ |
| bool isFull = false; |
| |
| _ExportNamespace(this.namespace); |
| } |
| |
| /** |
| * A [_Meaning] stores all the information necessary to find the declaration |
| * referred to by a name in a namespace. |
| */ |
| class _Meaning { |
| /** |
| * Which unit in the dependent library contains the declared entity. |
| */ |
| final int unit; |
| |
| /** |
| * The kind of entity being referred to. |
| */ |
| final ReferenceKind kind; |
| |
| /** |
| * Which of the dependencies of the library being prelinked contains the |
| * declared entity. |
| */ |
| final int dependency; |
| |
| /** |
| * If the entity being referred to is generic, the number of type parameters |
| * it accepts. Otherwise zero. |
| */ |
| final int numTypeParameters; |
| |
| _Meaning(this.unit, this.kind, this.dependency, this.numTypeParameters); |
| |
| /** |
| * Encode this [_Meaning] as a [LinkedExportName], using the given [name]. |
| */ |
| LinkedExportName encodeExportName(String name) { |
| return new LinkedExportNameBuilder( |
| name: name, dependency: dependency, unit: unit, kind: kind); |
| } |
| |
| /** |
| * Encode this [_Meaning] as a [LinkedReference]. |
| */ |
| LinkedReferenceBuilder encodeReference() { |
| return new LinkedReferenceBuilder( |
| unit: unit, |
| kind: kind, |
| dependency: dependency, |
| numTypeParameters: numTypeParameters); |
| } |
| } |
| |
| /** |
| * Mapping from names to corresponding unique [_Meaning]s. |
| */ |
| class _Namespace { |
| final Set<String> namesWithConflictingDefinitions = new Set<String>(); |
| final Set<String> libraryNames = new Set<String>(); |
| final Map<String, _Meaning> map = <String, _Meaning>{}; |
| |
| /** |
| * Return the [_Meaning] of the name, or `null` is not defined. |
| */ |
| _Meaning operator [](String name) { |
| return map[name]; |
| } |
| |
| /** |
| * Define that the [name] has the given [value]. If the [name] already been |
| * defined with a different value, then it becomes undefined. |
| */ |
| void add(String name, _Meaning value) { |
| // Already determined to be a conflict. |
| if (namesWithConflictingDefinitions.contains(name)) { |
| return; |
| } |
| |
| _Meaning currentValue = map[name]; |
| if (currentValue == null) { |
| map[name] = value; |
| } else if (currentValue == value) { |
| // The same value, ignore. |
| } else { |
| // A conflict, remember it, and un-define the name. |
| namesWithConflictingDefinitions.add(name); |
| map.remove(name); |
| } |
| } |
| |
| /** |
| * Return `true` if the [name] was defined before [rememberLibraryNames] |
| * invocation. |
| */ |
| bool definesLibraryName(String name) => libraryNames.contains(name); |
| |
| /** |
| * Return `true` if the [name] is already defined. |
| */ |
| bool definesName(String name) => map.containsKey(name); |
| |
| /** |
| * Apply [f] to each name-meaning pair. |
| */ |
| void forEach(void f(String key, _Meaning value)) { |
| map.forEach(f); |
| } |
| |
| /** |
| * This method should be invoked after defining all names that are defined |
| * in a library, before defining imported names. |
| */ |
| void rememberLibraryNames() { |
| libraryNames.addAll(map.keys); |
| } |
| } |
| |
| /** |
| * A [_Meaning] representing a prefix introduced by an import directive. |
| */ |
| class _PrefixMeaning extends _Meaning { |
| final _Namespace namespace = new _Namespace(); |
| |
| _PrefixMeaning() : super(0, ReferenceKind.prefix, 0, 0); |
| } |
| |
| /** |
| * Helper class containing temporary data structures needed to prelink a single |
| * library. |
| */ |
| class _Prelinker { |
| final String definingUnitUri; |
| final UnlinkedUnit definingUnit; |
| final GetPartCallback getPart; |
| final GetImportCallback getImport; |
| final GetDeclaredVariable getDeclaredVariable; |
| |
| /** |
| * Cache of values returned by [getImport]. |
| */ |
| final Map<String, UnlinkedPublicNamespace> importCache = |
| <String, UnlinkedPublicNamespace>{}; |
| |
| /** |
| * Cache of values returned by [getPart]. |
| */ |
| final Map<String, UnlinkedUnit> partCache = <String, UnlinkedUnit>{}; |
| |
| /** |
| * Names defined inside the library being prelinked. |
| */ |
| final _Namespace privateNamespace = new _Namespace() |
| ..add('dynamic', new _Meaning(0, ReferenceKind.classOrEnum, 0, 0)) |
| ..add('void', new _Meaning(0, ReferenceKind.classOrEnum, 0, 0)); |
| |
| /** |
| * List of dependencies of the library being prelinked. This will be output |
| * to [LinkedLibrary.dependencies]. |
| */ |
| final List<LinkedDependencyBuilder> dependencies = |
| <LinkedDependencyBuilder>[]; |
| |
| /** |
| * Map from the absolute URI of a dependent library to the index of the |
| * corresponding entry in [dependencies]. |
| */ |
| final Map<String, int> uriToDependency = <String, int>{}; |
| |
| /** |
| * List of public namespaces corresponding to each entry in [dependencies]. |
| */ |
| final List<_Namespace> dependencyToPublicNamespace = <_Namespace>[]; |
| |
| /** |
| * Map from absolute URI of a library to its export namespace. |
| */ |
| final Map<String, _ExportNamespace> exportNamespaces = {}; |
| |
| _Prelinker(this.definingUnitUri, this.definingUnit, this.getPart, |
| this.getImport, this.getDeclaredVariable) { |
| partCache[definingUnitUri] = definingUnit; |
| importCache[definingUnitUri] = definingUnit.publicNamespace; |
| } |
| |
| /** |
| * Compute the public namespace for the library whose URI is reachable from |
| * [definingUnit] via [absoluteUri], by aggregating together public namespace |
| * information from all of its parts. |
| */ |
| _Namespace aggregatePublicNamespace(String absoluteUri) { |
| if (uriToDependency.containsKey(absoluteUri)) { |
| return dependencyToPublicNamespace[uriToDependency[absoluteUri]]; |
| } |
| assert(dependencies.length == dependencyToPublicNamespace.length); |
| int dependency = dependencies.length; |
| uriToDependency[absoluteUri] = dependency; |
| List<String> unitUris = getUnitUris(absoluteUri); |
| LinkedDependencyBuilder linkedDependency = new LinkedDependencyBuilder( |
| uri: absoluteUri, |
| parts: unitUris.skip(1).map((uri) => uri ?? '').toList()); |
| dependencies.add(linkedDependency); |
| |
| _Namespace aggregated = new _Namespace(); |
| |
| for (int unitNum = 0; unitNum < unitUris.length; unitNum++) { |
| String unitUri = unitUris[unitNum]; |
| UnlinkedPublicNamespace importedNamespace = getImportCached(unitUri); |
| if (importedNamespace == null) { |
| continue; |
| } |
| for (UnlinkedPublicName name in importedNamespace.names) { |
| if (name.kind == ReferenceKind.classOrEnum) { |
| _Namespace namespace = new _Namespace(); |
| name.members.forEach((executable) { |
| namespace.add( |
| executable.name, |
| new _Meaning( |
| unitNum, executable.kind, 0, executable.numTypeParameters)); |
| }); |
| aggregated.add( |
| name.name, |
| new _ClassMeaning( |
| unitNum, dependency, name.numTypeParameters, namespace)); |
| } else { |
| aggregated.add( |
| name.name, |
| new _Meaning( |
| unitNum, name.kind, dependency, name.numTypeParameters)); |
| } |
| } |
| } |
| |
| aggregated.rememberLibraryNames(); |
| |
| dependencyToPublicNamespace.add(aggregated); |
| return aggregated; |
| } |
| |
| /** |
| * Compute the export namespace for the library whose URI is reachable from |
| * [definingUnit] via [absoluteUri], by aggregating together public namespace |
| * information from the library and the transitive closure of its exports. |
| */ |
| _Namespace computeExportNamespace(String absoluteUri) { |
| int firstCycleIdOfLastCall = 0; |
| _Namespace chaseExports(String absoluteUri) { |
| _ExportNamespace exportNamespace = getExportNamespace(absoluteUri); |
| |
| // If the export namespace is ready, return it. |
| if (exportNamespace.isFull) { |
| firstCycleIdOfLastCall = 0; |
| return exportNamespace.namespace; |
| } |
| |
| // If we are computing the export namespace for this library, and we |
| // reached here, then we found a cycle. |
| if (exportNamespace.id != 0) { |
| firstCycleIdOfLastCall = exportNamespace.id; |
| return null; |
| } |
| |
| // Give each library a unique identifier. |
| exportNamespace.id = _ExportNamespace.nextId++; |
| |
| // Append from exports. |
| int firstCycleId = 0; |
| UnlinkedPublicNamespace publicNamespace = getImportCached(absoluteUri); |
| if (publicNamespace != null) { |
| for (UnlinkedExportPublic export in publicNamespace.exports) { |
| String unlinkedExportUri = |
| _selectUri(export.uri, export.configurations); |
| String exportUri = resolveUri(absoluteUri, unlinkedExportUri); |
| if (exportUri != null) { |
| NameFilter filter = |
| new NameFilter.forUnlinkedCombinators(export.combinators); |
| _Namespace exported = chaseExports(exportUri); |
| exported?.forEach((String name, _Meaning meaning) { |
| if (filter.accepts(name) && |
| !exportNamespace.namespace.definesLibraryName(name)) { |
| exportNamespace.namespace.add(name, meaning); |
| } |
| }); |
| if (firstCycleIdOfLastCall != 0) { |
| if (firstCycleId == 0 || firstCycleId > firstCycleIdOfLastCall) { |
| firstCycleId = firstCycleIdOfLastCall; |
| } |
| } |
| } |
| } |
| } |
| |
| // If this library is the first component of the cycle, then we are at |
| // the beginning of this cycle, and combination of partial export |
| // namespaces of other exported libraries and declarations of this |
| // library is the full export namespace of this library. |
| if (firstCycleId != 0 && firstCycleId == exportNamespace.id) { |
| firstCycleId = 0; |
| } |
| |
| // We're done with this library, successfully or not. |
| exportNamespace.id = 0; |
| |
| // If no cycle detected in exports, mark the export namespace as full. |
| if (firstCycleId == 0) { |
| exportNamespace.isFull = true; |
| } |
| |
| // Return the full or partial result. |
| firstCycleIdOfLastCall = firstCycleId; |
| return exportNamespace.namespace; |
| } |
| |
| _ExportNamespace.nextId = 1; |
| return chaseExports(absoluteUri); |
| } |
| |
| /** |
| * Extract all the names defined in [unit] (which is the [unitNum]th unit in |
| * the library being prelinked) and store them in [privateNamespace]. |
| * Excludes names introduced by `import` statements. |
| */ |
| void extractPrivateNames(UnlinkedUnit unit, int unitNum) { |
| for (UnlinkedClass cls in unit.classes) { |
| _Namespace namespace = new _Namespace(); |
| cls.fields.forEach((field) { |
| if (field.isStatic && field.isConst) { |
| namespace.add(field.name, |
| new _Meaning(unitNum, ReferenceKind.propertyAccessor, 0, 0)); |
| } |
| }); |
| cls.executables.forEach((executable) { |
| ReferenceKind kind = null; |
| if (executable.kind == UnlinkedExecutableKind.constructor) { |
| kind = ReferenceKind.constructor; |
| } else if (executable.kind == UnlinkedExecutableKind.functionOrMethod && |
| executable.isStatic) { |
| kind = ReferenceKind.method; |
| } else if (executable.kind == UnlinkedExecutableKind.getter && |
| executable.isStatic) { |
| kind = ReferenceKind.propertyAccessor; |
| } |
| if (kind != null && executable.name.isNotEmpty) { |
| namespace.add(executable.name, |
| new _Meaning(unitNum, kind, 0, executable.typeParameters.length)); |
| } |
| }); |
| privateNamespace.add(cls.name, |
| new _ClassMeaning(unitNum, 0, cls.typeParameters.length, namespace)); |
| } |
| for (UnlinkedEnum enm in unit.enums) { |
| _Namespace namespace = new _Namespace(); |
| enm.values.forEach((UnlinkedEnumValue value) { |
| namespace.add(value.name, |
| new _Meaning(unitNum, ReferenceKind.propertyAccessor, 0, 0)); |
| }); |
| namespace.add('values', |
| new _Meaning(unitNum, ReferenceKind.propertyAccessor, 0, 0)); |
| privateNamespace.add( |
| enm.name, new _ClassMeaning(unitNum, 0, 0, namespace)); |
| } |
| for (UnlinkedExecutable executable in unit.executables) { |
| privateNamespace.add( |
| executable.name, |
| new _Meaning( |
| unitNum, |
| executable.kind == UnlinkedExecutableKind.functionOrMethod |
| ? ReferenceKind.topLevelFunction |
| : ReferenceKind.topLevelPropertyAccessor, |
| 0, |
| executable.typeParameters.length)); |
| } |
| for (UnlinkedTypedef typedef in unit.typedefs) { |
| ReferenceKind kind; |
| switch (typedef.style) { |
| case TypedefStyle.functionType: |
| kind = ReferenceKind.typedef; |
| break; |
| case TypedefStyle.genericFunctionType: |
| kind = ReferenceKind.genericFunctionTypedef; |
| break; |
| } |
| assert(kind != null); |
| privateNamespace.add(typedef.name, |
| new _Meaning(unitNum, kind, 0, typedef.typeParameters.length)); |
| } |
| for (UnlinkedVariable variable in unit.variables) { |
| privateNamespace.add(variable.name, |
| new _Meaning(unitNum, ReferenceKind.topLevelPropertyAccessor, 0, 0)); |
| if (!(variable.isConst || variable.isFinal)) { |
| privateNamespace.add( |
| variable.name + '=', |
| new _Meaning( |
| unitNum, ReferenceKind.topLevelPropertyAccessor, 0, 0)); |
| } |
| } |
| } |
| |
| /** |
| * Filter the export namespace for the library whose URI is reachable the |
| * given [absoluteUri], retaining only those names accepted by |
| * [combinators], and store the resulting names in [result]. Names that |
| * already exist in [result] are not overwritten. |
| */ |
| void filterExportNamespace(String absoluteUri, |
| List<UnlinkedCombinator> combinators, _Namespace result) { |
| _Namespace exportNamespace = computeExportNamespace(absoluteUri); |
| if (result == null) { |
| // This can happen if the import prefix was shadowed by a local name, so |
| // the imported symbols are inaccessible. |
| return; |
| } |
| NameFilter filter = new NameFilter.forUnlinkedCombinators(combinators); |
| exportNamespace.forEach((String name, _Meaning meaning) { |
| if (filter.accepts(name) && !result.definesLibraryName(name)) { |
| result.add(name, meaning); |
| } |
| }); |
| } |
| |
| /** |
| * Return the [_ExportNamespace] for the library with the given [absoluteUri]. |
| * The export namespace might be full (will all exports included), or |
| * partial (with public namespace, and only some of the exports included). |
| */ |
| _ExportNamespace getExportNamespace(String absoluteUri) { |
| _ExportNamespace exportNamespace = exportNamespaces[absoluteUri]; |
| if (exportNamespace == null) { |
| _Namespace publicNamespace = aggregatePublicNamespace(absoluteUri); |
| exportNamespace = new _ExportNamespace(publicNamespace); |
| exportNamespaces[absoluteUri] = exportNamespace; |
| } |
| return exportNamespace; |
| } |
| |
| /** |
| * Wrapper around [getImport] that caches the return value in [importCache]. |
| */ |
| UnlinkedPublicNamespace getImportCached(String absoluteUri) { |
| return importCache.putIfAbsent(absoluteUri, () => getImport(absoluteUri)); |
| } |
| |
| /** |
| * Wrapper around [getPart] that caches the return value in [partCache] and |
| * updates [importCache] appropriately. |
| */ |
| UnlinkedUnit getPartCached(String absoluteUri) { |
| return partCache.putIfAbsent(absoluteUri, () { |
| UnlinkedUnit unit = getPart(absoluteUri); |
| importCache[absoluteUri] = unit?.publicNamespace; |
| return unit; |
| }); |
| } |
| |
| /** |
| * Compute the set of absolute URIs of all the compilation units in the |
| * library whose URI is reachable from [definingUnit] via [absoluteUri]. |
| */ |
| List<String> getUnitUris(String absoluteUri) { |
| List<String> result = <String>[absoluteUri]; |
| UnlinkedPublicNamespace publicNamespace = getImportCached(absoluteUri); |
| if (publicNamespace != null) { |
| result.addAll(publicNamespace.parts.map((String uri) { |
| return resolveUri(absoluteUri, uri); |
| })); |
| } |
| return result; |
| } |
| |
| /** |
| * Process a single `import` declaration in the library being prelinked. The |
| * return value is the index of the imported library in [dependencies]. |
| */ |
| int handleImport(UnlinkedImport import) { |
| String unlinkedUri = import.isImplicit |
| ? 'dart:core' |
| : _selectUri(import.uri, import.configurations); |
| String absoluteUri = resolveUri(definingUnitUri, unlinkedUri); |
| |
| _Namespace targetNamespace = null; |
| if (import.prefixReference != 0) { |
| // The name introduced by an import declaration can't have a prefix of |
| // its own. |
| assert( |
| definingUnit.references[import.prefixReference].prefixReference == 0); |
| String prefix = definingUnit.references[import.prefixReference].name; |
| _Meaning prefixMeaning = privateNamespace[prefix]; |
| if (prefixMeaning is _PrefixMeaning) { |
| targetNamespace = prefixMeaning.namespace; |
| } |
| } else { |
| targetNamespace = privateNamespace; |
| } |
| filterExportNamespace(absoluteUri, import.combinators, targetNamespace); |
| return uriToDependency[absoluteUri]; |
| } |
| |
| /** |
| * Produce a [LinkedUnit] for the given [unit], by resolving every one of |
| * its references. |
| */ |
| LinkedUnitBuilder linkUnit(UnlinkedUnit unit) { |
| if (unit == null) { |
| return new LinkedUnitBuilder(); |
| } |
| Map<int, _Namespace> prefixNamespaces = <int, _Namespace>{}; |
| List<LinkedReferenceBuilder> references = <LinkedReferenceBuilder>[]; |
| for (int i = 0; i < unit.references.length; i++) { |
| UnlinkedReference reference = unit.references[i]; |
| _Namespace namespace; |
| if (reference.prefixReference == 0) { |
| namespace = privateNamespace; |
| } else { |
| // Prefix references must always point backward. |
| assert(reference.prefixReference < i); |
| namespace = prefixNamespaces[reference.prefixReference]; |
| // Expressions like 'a.b.c.d' cannot be prelinked. |
| namespace ??= new _Namespace(); |
| } |
| _Meaning meaning = namespace[reference.name]; |
| if (meaning != null) { |
| if (meaning is _PrefixMeaning) { |
| prefixNamespaces[i] = meaning.namespace; |
| } else if (meaning is _ClassMeaning) { |
| prefixNamespaces[i] = meaning.namespace; |
| } |
| references.add(meaning.encodeReference()); |
| } else { |
| references |
| .add(new LinkedReferenceBuilder(kind: ReferenceKind.unresolved)); |
| } |
| } |
| return new LinkedUnitBuilder(references: references); |
| } |
| |
| /** |
| * Form the [LinkedLibrary] for the [definingUnit] that was passed to the |
| * constructor. |
| */ |
| LinkedLibraryBuilder prelink() { |
| aggregatePublicNamespace(definingUnitUri); |
| |
| // Gather up the unlinked summaries for all the compilation units in the |
| // library. |
| List<String> unitUris = getUnitUris(definingUnitUri); |
| List<UnlinkedUnit> units = unitUris.map(getPartCached).toList(); |
| |
| // Create the private namespace for the library by gathering all the names |
| // defined in its compilation units. |
| for (int unitNum = 0; unitNum < units.length; unitNum++) { |
| UnlinkedUnit unit = units[unitNum]; |
| if (unit != null) { |
| extractPrivateNames(unit, unitNum); |
| } |
| } |
| |
| // Fill in exported names. This must be done before filling in prefixes |
| // defined in import declarations, because prefixes shouldn't shadow |
| // exports. |
| List<LinkedExportNameBuilder> exportNames = <LinkedExportNameBuilder>[]; |
| computeExportNamespace(definingUnitUri) |
| .forEach((String name, _Meaning meaning) { |
| if (!privateNamespace.definesName(name)) { |
| exportNames.add(meaning.encodeExportName(name)); |
| } |
| }); |
| |
| // Fill in prefixes defined in import declarations. |
| for (UnlinkedImport import in units[0].imports) { |
| if (import.prefixReference != 0) { |
| String name = units[0].references[import.prefixReference].name; |
| if (!privateNamespace.definesName(name)) { |
| privateNamespace.add(name, new _PrefixMeaning()); |
| } |
| } |
| } |
| |
| // All the names defined so far are library local, they take precedence |
| // over anything imported from other libraries. |
| privateNamespace.rememberLibraryNames(); |
| |
| // Fill in imported and exported names. |
| List<int> importDependencies = |
| definingUnit.imports.map(handleImport).toList(); |
| List<int> exportDependencies = definingUnit.publicNamespace.exports |
| .map((UnlinkedExportPublic exp) { |
| String unlinkedUri = _selectUri(exp.uri, exp.configurations); |
| String absoluteUri = resolveUri(definingUnitUri, unlinkedUri); |
| return uriToDependency[absoluteUri]; |
| }) |
| .where((dependency) => dependency != null) |
| .toList(); |
| |
| // Link each compilation unit. |
| List<LinkedUnitBuilder> linkedUnits = units.map(linkUnit).toList(); |
| |
| return new LinkedLibraryBuilder( |
| units: linkedUnits, |
| dependencies: dependencies, |
| importDependencies: importDependencies, |
| exportDependencies: exportDependencies, |
| exportNames: exportNames, |
| numPrelinkedDependencies: dependencies.length); |
| } |
| |
| /** |
| * Resolve [relativeUri] relative to [containingUri]. Return `null` if |
| * [relativeUri] is invalid or empty, so cannot be resolved. |
| */ |
| String resolveUri(String containingUri, String relativeUri) { |
| if (relativeUri == '') { |
| return null; |
| } |
| try { |
| Uri containingUriObj = Uri.parse(containingUri); |
| Uri relativeUriObj = Uri.parse(relativeUri); |
| return resolveRelativeUri(containingUriObj, relativeUriObj).toString(); |
| } on FormatException { |
| return null; |
| } |
| } |
| |
| /** |
| * Return the URI of the first configuration from the given [configurations] |
| * which condition is satisfied, or the [defaultUri]. |
| */ |
| String _selectUri( |
| String defaultUri, List<UnlinkedConfiguration> configurations) { |
| for (UnlinkedConfiguration configuration in configurations) { |
| if (getDeclaredVariable(configuration.name) == configuration.value) { |
| return configuration.uri; |
| } |
| } |
| return defaultUri; |
| } |
| } |
