ui: snippet sizes

* added SnippetMerger class that conducts the merging and snapping of TokenLocations to create snippets.
* added parameters for snippet snapping and merging to ApplicationSettings.
* added forEachStartTokenLocation() and forEachEndTokenLocation() to TokenLocationLine and TokenLocationFile.
* added < and > operators to TokenLocation that compare the location part (not the id).

src/lib/data/access/StorageAccess.h

@@ -11,6 +11,7 @@
 #include "data/search/SearchMatch.h"
 
 class Graph;
+class TokenLocation;
 class TokenLocationCollection;
 class TokenLocationFile;
 
@@ -38,6 +39,7 @@ public:
 		const std::string& filePath, uint firstLineNumber, uint lastLineNumber) const = 0;
 
 	virtual TokenLocationCollection getErrorTokenLocations(std::vector<std::string>* errorMessages) const = 0;
+	virtual std::shared_ptr<TokenLocationFile> getTokenLocationOfParentScope(const TokenLocation* child) const = 0;
 };
 
 #endif // STORAGE_ACCESS_H

src/lib/data/access/StorageAccessProxy.cpp

@@ -153,3 +153,13 @@ TokenLocationCollection StorageAccessProxy::getErrorTokenLocations(std::vector<s
 
 	return TokenLocationCollection();
 }
+
+std::shared_ptr<TokenLocationFile> StorageAccessProxy::getTokenLocationOfParentScope(const TokenLocation* child) const
+{
+	if (hasSubject())
+	{
+		return m_subject->getTokenLocationOfParentScope(child);
+	}
+
+	return std::make_shared<TokenLocationFile>("");
+}

src/lib/data/access/StorageAccessProxy.h

@@ -34,6 +34,8 @@ public:
 
 	virtual TokenLocationCollection getErrorTokenLocations(std::vector<std::string>* errorMessages) const;
 
+	virtual std::shared_ptr<TokenLocationFile> getTokenLocationOfParentScope(const TokenLocation* child) const;
+
 private:
 	StorageAccess* m_subject;
 };