Implement manifest serializer

1 files changed, 73 insertions, 0 deletions

diff --git a/bpkg/manifest-serializer b/bpkg/manifest-serializer
new file mode 100644
index 0000000..2c5a09b
--- /dev/null
+++ b/bpkg/manifest-serializer
@@ -0,0 +1,73 @@
+// file      : bpkg/manifest-serializer -*- C++ -*-
+// copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef BPKG_MANIFEST_SERIALIZER
+#define BPKG_MANIFEST_SERIALIZER
+
+#include <string>
+#include <iosfwd>
+#include <cstddef>   // size_t
+#include <stdexcept> // runtime_error
+
+namespace bpkg
+{
+  class manifest_serialization: public std::runtime_error
+  {
+  public:
+    manifest_serialization (const std::string& name,
+                            const std::string& description);
+
+    std::string name;
+    std::string description;
+  };
+
+  class manifest_serializer
+  {
+  public:
+    manifest_serializer (std::ostream& os, const std::string& name)
+        : os_ (os), name_ (name) {}
+
+    const std::string&
+    name () const {return name_;}
+
+    // The first name-value pair should be the special "start-of-manifest"
+    // with empty name and value being the format version. After that we
+    // have a sequence of ordinary pairs which are the manifest. At the
+    // end of the manifest we have the special "end-of-manifest" pair
+    // with empty name and value. After that we can either have another
+    // start-of-manifest pair (in which case the whole sequence repeats
+    // from the beginning) or we get another end-of-manifest pair which
+    // signals the end of stream.
+    //
+    void
+    next (const std::string& name, const std::string& value);
+
+    // Write a comment. The supplied text is prefixed with "# " and
+    // terminated with a newline.
+    //
+    void
+    comment (const std::string&);
+
+  private:
+    void
+    check_name (const std::string&);
+
+    // Write 'n' characters from 's' (assuming there are no newlines)
+    // split into multiple lines at or near the 78 characters
+    // boundary. The first line starts at the 'column' offset.
+    //
+    void
+    write_value (std::size_t column, const char* s, std::size_t n);
+
+  private:
+    enum {start, body, end} s_ = start;
+    std::string version_; // Current format version.
+
+  private:
+    std::ostream& os_;
+    const std::string name_;
+  };
+}
+
+#endif // BPKG_MANIFEST_SERIALIZER