qmldir parser: add support for "depends component version" syntax

Dependency declarations are initially for the benefit of
qmlimportscanner which does not (yet) use this parser.  This patch
adds support for dependencies into the qmldir parser for completeness,
along with autotests.  It is necessary to prevent errors at runtime
when parsing a qmldir which contains the "depends" declaration.

Task-number: QTBUG-41489
Change-Id: Ief2524a30140c42874f94f1735755b171e15dcf7
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>

2 files changed, 30 insertions, 0 deletions

diff --git a/src/qml/qml/qqmldirparser.cpp b/src/qml/qml/qqmldirparser.cpp
index 7068818f15..83e1c9c757 100644
--- a/src/qml/qml/qqmldirparser.cpp
+++ b/src/qml/qml/qqmldirparser.cpp
@@ -231,6 +231,28 @@ bool QQmlDirParser::parse(const QString &source)
                 reportError(lineNumber, 0, QString::fromLatin1("designersupported does not expect any argument"));
             else
                 _designerSupported = true;
+        } else if (sections[0] == QLatin1String("depends")) {
+            if (sectionCount != 3) {
+                reportError(lineNumber, 0,
+                            QString::fromLatin1("depends requires 2 arguments, but %1 were provided").arg(sectionCount - 1));
+                continue;
+            }
+
+            const QString &version = sections[2];
+            const int dotIndex = version.indexOf(QLatin1Char('.'));
+            bool validVersionNumber = false;
+            const int majorVersion = parseInt(QStringRef(&version, 0, dotIndex), &validVersionNumber);
+            if (validVersionNumber) {
+                const int minorVersion = parseInt(QStringRef(&version, dotIndex+1, version.length()-dotIndex-1), &validVersionNumber);
+
+                if (validVersionNumber) {
+                    Component entry(sections[1], QString(), majorVersion, minorVersion);
+                    entry.internal = true;
+                    _dependencies.insert(entry.typeName, entry);
+                }
+            } else {
+                reportError(lineNumber, 0, QString(QLatin1String("invalid version %1")).arg(version));
+            }
         } else if (sectionCount == 2) {
             // No version specified (should only be used for relative qmldir files)
             const Component entry(sections[0], sections[1], -1, -1);
@@ -348,6 +370,11 @@ QHash<QString, QQmlDirParser::Component> QQmlDirParser::components() const
     return _components;
 }
 
+QHash<QString, QQmlDirParser::Component> QQmlDirParser::dependencies() const
+{
+    return _dependencies;
+}
+
 QList<QQmlDirParser::Script> QQmlDirParser::scripts() const
 {
     return _scripts;
diff --git a/src/qml/qml/qqmldirparser_p.h b/src/qml/qml/qqmldirparser_p.h
index 54843a13b0..bbe61dfb96 100644
--- a/src/qml/qml/qqmldirparser_p.h
+++ b/src/qml/qml/qqmldirparser_p.h
@@ -119,6 +119,7 @@ public:
     };
 
     QHash<QString,Component> components() const;
+    QHash<QString,Component> dependencies() const;
     QList<Script> scripts() const;
     QList<Plugin> plugins() const;
     bool designerSupported() const;
@@ -137,12 +138,14 @@ public:
 #endif
 
 private:
+    bool maybeAddComponent(const QString &typeName, const QString &fileName, const QString &version, QHash<QString,Component> &hash, int lineNumber = -1, bool multi = true);
     void reportError(quint16 line, quint16 column, const QString &message);
 
 private:
     QList<QQmlJS::DiagnosticMessage> _errors;
     QString _typeNamespace;
     QHash<QString,Component> _components; // multi hash
+    QHash<QString,Component> _dependencies;
     QList<Script> _scripts;
     QList<Plugin> _plugins;
     bool _designerSupported;