Added a way to parse from a string

src/sfizz/parser/Parser.cpp

@@ -23,13 +23,18 @@ void Parser::addDefinition(absl::string_view id, absl::string_view value)
     _definitions[id] = std::string(value);
 }
 
-void Parser::parseFile(const fs::path& path)
+void Parser::reset()
 {
     _pathsIncluded.clear();
     _currentHeader.reset();
     _currentOpcodes.clear();
     _errorCount = 0;
     _warningCount = 0;
+}
+
+void Parser::parseFile(const fs::path& path)
+{
+    reset();
 
     if (_listener)
         _listener->onParseBegin();
@@ -42,6 +47,21 @@ void Parser::parseFile(const fs::path& path)
         _listener->onParseEnd();
 }
 
+void Parser::parseString(absl::string_view sfzView)
+{
+    reset();
+
+    if (_listener)
+        _listener->onParseBegin();
+
+    _included.push_back(absl::make_unique<StringViewReader>(sfzView));
+    processTopLevel();
+    flushCurrentHeader();
+
+    if (_listener)
+        _listener->onParseEnd();
+}
+
 void Parser::includeNewFile(const fs::path& path)
 {
     fs::path fullPath =

src/sfizz/parser/Parser.h

@@ -29,6 +29,7 @@ public:
 
     void addDefinition(absl::string_view id, absl::string_view value);
     void parseFile(const fs::path& path);
+    void parseString(absl::string_view sfzView);
 
     void setRecursiveIncludeGuardEnabled(bool en) { _recursiveIncludeGuardEnabled = en; }
     void setMaximumIncludeDepth(size_t depth) { _maxIncludeDepth = depth; }
@@ -66,6 +67,7 @@ private:
     void processDirective();
     void processHeader();
     void processOpcode();
+    void reset();
 
     // errors and warnings
     void emitError(const SourceRange& range, const std::string& message);

src/sfizz/parser/ParserPrivate.cpp

@@ -139,4 +139,18 @@ int FileReader::getNextStreamByte()
     return _fileStream.get();
 }
 
+StringViewReader::StringViewReader(absl::string_view sfzView)
+    : Reader({}), _sfzView(sfzView)
+{
+
+}
+
+int StringViewReader::getNextStreamByte()
+{
+    if (position < _sfzView.length())
+        return _sfzView[position++];
+
+    return kEof;
+}
+
 }  // namespace sfz

src/sfizz/parser/ParserPrivate.h

@@ -119,6 +119,21 @@ private:
     fs::ifstream _fileStream;
 };
 
+/**
+ * @brief String-view-based version of Reader.
+ */
+class StringViewReader : public Reader {
+public:
+    explicit StringViewReader(absl::string_view sfzView);
+
+protected:
+    int getNextStreamByte() override;
+
+private:
+    absl::string_view _sfzView;
+    size_t position { 0 };
+};
+
 }  // namespace sfz
 
 #include "ParserPrivate.hpp"