From 0eb18f850ebcff530111ef6a00a87938d6e51f92 Mon Sep 17 00:00:00 2001
From: Thomas Hartmann <Thomas.Hartmann@nokia.com>
Date: Tue, 7 Dec 2010 17:31:53 +0100
Subject: [PATCH] QmlJSCheck: adding more checks

We are checking for duplicate ids and duplicate property definitions now.
---
 src/libs/qmljs/qmljscheck.cpp | 51 +++++++++++++++++++++++++++++++++--
 src/libs/qmljs/qmljscheck.h   | 17 ++++++++++++
 2 files changed, 66 insertions(+), 2 deletions(-)

diff --git a/src/libs/qmljs/qmljscheck.cpp b/src/libs/qmljs/qmljscheck.cpp
index a144597388c..275d408a2a4 100644
--- a/src/libs/qmljs/qmljscheck.cpp
+++ b/src/libs/qmljs/qmljscheck.cpp
@@ -72,6 +72,20 @@ SourceLocation QmlJS::locationFromRange(const SourceLocation &start,
                           start.startColumn);
 }
 
+SourceLocation QmlJS::fullLocationForQualifiedId(AST::UiQualifiedId *qualifiedId)
+{
+    SourceLocation start = qualifiedId->identifierToken;
+    SourceLocation end = qualifiedId->identifierToken;
+
+    for (UiQualifiedId *iter = qualifiedId; iter; iter = iter->next) {
+        if (iter->name)
+            end = iter->identifierToken;
+    }
+
+    return locationFromRange(start, end);
+}
+
+
 DiagnosticMessage QmlJS::errorMessage(const AST::SourceLocation &loc, const QString &message)
 {
     return DiagnosticMessage(DiagnosticMessage::Error, loc, message);
@@ -387,6 +401,29 @@ bool Check::visit(UiProgram *)
     return true;
 }
 
+bool Check::visit(UiObjectInitializer *)
+{
+     m_propertyStack.push(StringSet());
+     return true;
+}
+
+void Check::endVisit(UiObjectInitializer *)
+{
+    m_propertyStack.pop();
+}
+
+void Check::checkProperty(UiQualifiedId *qualifiedId)
+{
+    const QString id = Bind::toString(qualifiedId);
+    if (id.at(0).isLower()) {
+        if (m_propertyStack.top().contains(id)) {
+            error(fullLocationForQualifiedId(qualifiedId),
+                  Check::tr("properties can only be assigned once"));
+        }
+        m_propertyStack.top().insert(id);
+    }
+}
+
 bool Check::visit(UiObjectDefinition *ast)
 {
     visitQmlObject(ast, ast->qualifiedTypeNameId, ast->initializer);
@@ -396,6 +433,7 @@ bool Check::visit(UiObjectDefinition *ast)
 bool Check::visit(UiObjectBinding *ast)
 {
     checkScopeObjectMember(ast->qualifiedId);
+    checkProperty(ast->qualifiedId);
 
     visitQmlObject(ast, ast->qualifiedTypeNameId, ast->initializer);
     return false;
@@ -457,12 +495,20 @@ bool Check::visit(UiScriptBinding *ast)
             return false;
         }
 
-        if (id.isEmpty() || ! id[0].isLower()) {
-            error(loc, Check::tr("ids must be lower case"));
+        if (id.isEmpty() || (!id[0].isLower() && id[0] != '_')) {
+            error(loc, Check::tr("ids must be lower case or start with underscore"));
             return false;
         }
+
+        if (m_ids.contains(id)) {
+            error(loc, Check::tr("ids must be unique"));
+            return false;
+        }
+        m_ids.insert(id);
     }
 
+    checkProperty(ast->qualifiedId);
+
     const Value *lhsValue = checkScopeObjectMember(ast->qualifiedId);
     if (lhsValue) {
         // ### Fix the evaluator to accept statements!
@@ -493,6 +539,7 @@ bool Check::visit(UiScriptBinding *ast)
 bool Check::visit(UiArrayBinding *ast)
 {
     checkScopeObjectMember(ast->qualifiedId);
+    checkProperty(ast->qualifiedId);
 
     return true;
 }
diff --git a/src/libs/qmljs/qmljscheck.h b/src/libs/qmljs/qmljscheck.h
index 1c471b15a2c..9bbb6595faf 100644
--- a/src/libs/qmljs/qmljscheck.h
+++ b/src/libs/qmljs/qmljscheck.h
@@ -36,6 +36,8 @@
 #include <qmljs/parser/qmljsastvisitor_p.h>
 
 #include <QtCore/QCoreApplication>
+#include <QtCore/QSet>
+#include <QtCore/QStack>
 #include <QtGui/QColor>
 
 namespace QmlJS {
@@ -44,12 +46,18 @@ class QMLJS_EXPORT Check: protected AST::Visitor
 {
     Q_DECLARE_TR_FUNCTIONS(QmlJS::Check)
 
+    typedef QSet<QString> StringSet;
+
 public:
     Check(Document::Ptr doc, const Snapshot &snapshot, const Interpreter::Context *linkedContextNoScope);
     virtual ~Check();
 
     QList<DiagnosticMessage> operator()();
 
+
+    void setIgnoreTypeErrors(bool ignore)
+    { _ignoreTypeErrors = ignore; }
+
     enum Option {
         WarnDangerousNonStrictEqualityChecks = 1 << 0,
         WarnAllNonStrictEqualityChecks       = 1 << 1,
@@ -79,6 +87,7 @@ protected:
     virtual bool visit(AST::FieldMemberExpression *ast);
     virtual bool visit(AST::FunctionDeclaration *ast);
     virtual bool visit(AST::FunctionExpression *ast);
+    virtual bool visit(AST::UiObjectInitializer *);
 
     virtual bool visit(AST::BinaryExpression *ast);
     virtual bool visit(AST::Block *ast);
@@ -94,12 +103,15 @@ protected:
     virtual bool visit(AST::CaseClause *ast);
     virtual bool visit(AST::DefaultClause *ast);
 
+    virtual void endVisit(QmlJS::AST::UiObjectInitializer *);
+
 private:
     void visitQmlObject(AST::Node *ast, AST::UiQualifiedId *typeId,
                         AST::UiObjectInitializer *initializer);
     const Interpreter::Value *checkScopeObjectMember(const AST::UiQualifiedId *id);
     void checkAssignInCondition(AST::ExpressionNode *condition);
     void checkEndsWithControlFlow(AST::StatementList *statements, AST::SourceLocation errorLoc);
+    void checkProperty(QmlJS::AST::UiQualifiedId *);
 
     void warning(const AST::SourceLocation &loc, const QString &message);
     void error(const AST::SourceLocation &loc, const QString &message);
@@ -119,12 +131,17 @@ private:
 
     const Interpreter::Value *_lastValue;
     QList<AST::Node *> _chain;
+    QSet<QString> m_ids;
+    QStack<StringSet> m_propertyStack;
 };
 
 QMLJS_EXPORT QColor toQColor(const QString &qmlColorString);
 
 QMLJS_EXPORT AST::SourceLocation locationFromRange(const AST::SourceLocation &start,
                                                    const AST::SourceLocation &end);
+
+QMLJS_EXPORT AST::SourceLocation fullLocationForQualifiedId(AST::UiQualifiedId *);
+
 QMLJS_EXPORT DiagnosticMessage errorMessage(const AST::SourceLocation &loc,
                                             const QString &message);