initial commit

include/sedpp/Output.h

@@ -0,0 +1,41 @@
+#pragma once
+
+#include <iosfwd>
+#include <string>
+#include <unordered_map>
+#include <unordered_set>
+#include <unordered_map>
+
+#include "sedpp/Options.h"
+
+namespace sedpp {
+
+// Centralizes delimiter-aware writes.  Most commands emit either pattern space
+// plus its original delimiter bit, or synthetic lines that always end in the
+// active delimiter.
+class Output {
+public:
+  Output(const Options &options, std::ostream &stream);
+
+  void write(const std::string &text);
+  void writeDelimiter(bool hadDelimiter);
+  void writeLine(const std::string &text);
+  void writePattern(const std::string &pattern, bool hadDelimiter);
+  void writeEscaped(const std::string &pattern, bool hadDelimiter, int width);
+  void writeFile(const std::string &path, const std::string &text,
+                 bool hadDelimiter);
+
+private:
+  // Pending delimiters defer the trailing separator for unterminated records
+  // until another write proves that a separator is needed between outputs.
+  void writePendingDelimiter(std::ostream &target, bool &pending);
+  char delimiter() const;
+
+  const Options &options_;
+  std::ostream &stream_;
+  bool pendingDelimiter_ = false;
+  std::unordered_map<std::string, bool> pendingFileDelimiter_;
+  std::unordered_set<std::string> openedWriteFiles_;
+};
+
+} // namespace sedpp