From e0af585ed57bdb5b1ea4f4a415fda13b5d99d2dc Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Wed, 1 Aug 2012 18:52:25 +0300
Subject: [PATCH] Use negative integers for built-in statements for better
 extensibility

---
 source/binaryparser.cpp | 8 ++++----
 source/binaryparser.h   | 2 +-
 source/binarywriter.cpp | 8 ++++----
 source/binarywriter.h   | 2 +-
 4 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/source/binaryparser.cpp b/source/binaryparser.cpp
index 5313128..81a86ea 100644
--- a/source/binaryparser.cpp
+++ b/source/binaryparser.cpp
@@ -24,8 +24,8 @@ BinaryParser::BinaryParser(Input &i, const string &s):
 	ParserMode(i, s),
 	first(true)
 {
-	dict[1] = DictEntry("__kwd", "iss");
-	dict[2] = DictEntry("__str", "is");
+	dict[-1] = DictEntry("__kwd", "iss");
+	dict[-2] = DictEntry("__str", "is");
 }
 
 Statement BinaryParser::parse()
@@ -38,7 +38,7 @@ Statement BinaryParser::parse()
 			if(st.args.size()!=3)
 				throw bad_definition("__kwd");
 
-			const unsigned id = st.args[0].get<unsigned>();
+			const int id = st.args[0].get<unsigned>();
 			const string &kw = st.args[1].get<const string &>();
 			const string &args = st.args[2].get<const string &>();
 			dict[id] = DictEntry(kw, args);
@@ -62,7 +62,7 @@ Statement BinaryParser::parse_statement()
 		in.get();
 	first = false;
 
-	unsigned id = parse_int();
+	int id = parse_int();
 	if(!in)
 		return Statement();
 
diff --git a/source/binaryparser.h b/source/binaryparser.h
index f9b8e54..b10d7b8 100644
--- a/source/binaryparser.h
+++ b/source/binaryparser.h
@@ -15,7 +15,7 @@ Parses data in binary format.
 class BinaryParser: public ParserMode
 {
 private:
-	typedef std::map<unsigned, DictEntry> Dictionary;
+	typedef std::map<int, DictEntry> Dictionary;
 	typedef std::map<unsigned, std::string> StringMap;
 
 	Dictionary dict;
diff --git a/source/binarywriter.cpp b/source/binarywriter.cpp
index c1e53fb..9c9c893 100644
--- a/source/binarywriter.cpp
+++ b/source/binarywriter.cpp
@@ -9,11 +9,11 @@ namespace DataFile {
 
 BinaryWriter::BinaryWriter(IO::Base &o):
 	WriterMode(o),
-	next_kwd_id(3),
+	next_kwd_id(1),
 	next_str_id(1)
 {
-	dict[DictEntry("__kwd", "iss")] = 1;
-	dict[DictEntry("__str", "is")] = 2;
+	dict[DictEntry("__kwd", "iss")] = -1;
+	dict[DictEntry("__str", "is")] = -2;
 }
 
 void BinaryWriter::write(const Statement &st)
@@ -24,7 +24,7 @@ void BinaryWriter::write(const Statement &st)
 
 void BinaryWriter::write_(const Statement &st)
 {
-	unsigned id = get_item(dict, DictEntry(st.keyword, st.get_signature()));
+	int id = get_item(dict, DictEntry(st.keyword, st.get_signature()));
 
 	write_int(id);
 	for(Statement::Arguments::const_iterator j = st.args.begin(); j!=st.args.end(); ++j)
diff --git a/source/binarywriter.h b/source/binarywriter.h
index 4d18196..1a11ae5 100644
--- a/source/binarywriter.h
+++ b/source/binarywriter.h
@@ -15,7 +15,7 @@ Writes data in binary format.
 class BinaryWriter: public WriterMode
 {
 private:
-	typedef std::map<DictEntry, unsigned> Dictionary;
+	typedef std::map<DictEntry, int> Dictionary;
 	typedef std::map<std::string, unsigned> StringMap;
 
 	Dictionary dict;
-- 
2.43.0