Tags, anchors, and aliases are all parsed now.

content.h

 #pragma once
 
 #include <ios>
+#include "parserstate.h"
 
 namespace YAML
 {
 	class Scanner;
+	class Parser;
 
 	class Content
 	{
@@ -12,7 +14,7 @@ namespace YAML
 		Content();
 		virtual ~Content();
 
-		virtual void Parse(Scanner *pScanner) = 0;
+		virtual void Parse(Scanner *pScanner, const ParserState& state) = 0;
 		virtual void Write(std::ostream& out, int indent) = 0;
 
 	protected:

document.cpp

@@ -20,7 +20,7 @@ namespace YAML
 		m_pRoot = 0;
 	}
 
-	void Document::Parse(Scanner *pScanner)
+	void Document::Parse(Scanner *pScanner, const ParserState& state)
 	{
 		Clear();
 
@@ -34,7 +34,7 @@ namespace YAML
 
 		// now create our root node and parse it
 		m_pRoot = new Node;
-		m_pRoot->Parse(pScanner);
+		m_pRoot->Parse(pScanner, state);
 
 		// and finally eat any doc ends we see
 		while(pScanner->PeekNextToken() && pScanner->PeekNextToken()->type == TT_DOC_END)

document.h

 #pragma once
 
 #include <ios>
+#include "parserstate.h"
 
 namespace YAML
 {
@@ -14,7 +15,7 @@ namespace YAML
 		~Document();
 
 		void Clear();
-		void Parse(Scanner *pScanner);
+		void Parse(Scanner *pScanner, const ParserState& state);
 
 		friend std::ostream& operator << (std::ostream& out, const Document& doc);
 

main.cpp

@@ -8,8 +8,11 @@ int main()
 	YAML::Parser parser(fin);
 
 	YAML::Document doc;
-	parser.GetNextDocument(doc);
-	std::cout << doc;
+	while(parser) {
+		std::cout << "---\n";
+		parser.GetNextDocument(doc);
+		std::cout << doc;
+	}
 	getchar();
 
 	return 0;

map.cpp

@@ -23,7 +23,7 @@ namespace YAML
 		m_data.clear();
 	}
 
-	void Map::Parse(Scanner *pScanner)
+	void Map::Parse(Scanner *pScanner, const ParserState& state)
 	{
 		Clear();
 
@@ -31,12 +31,12 @@ namespace YAML
 		Token *pToken = pScanner->PeekNextToken();
 
 		switch(pToken->type) {
-			case TT_BLOCK_MAP_START: ParseBlock(pScanner); break;
-			case TT_FLOW_MAP_START: ParseFlow(pScanner); break;
+			case TT_BLOCK_MAP_START: ParseBlock(pScanner, state); break;
+			case TT_FLOW_MAP_START: ParseFlow(pScanner, state); break;
 		}
 	}
 
-	void Map::ParseBlock(Scanner *pScanner)
+	void Map::ParseBlock(Scanner *pScanner, const ParserState& state)
 	{
 		// eat start token
 		pScanner->EatNextToken();
@@ -58,17 +58,17 @@ namespace YAML
 			m_data[pKey] = pValue;
 
 			// grab key
-			pKey->Parse(pScanner);
+			pKey->Parse(pScanner, state);
 
 			// now grab value (optional)
 			if(pScanner->PeekNextToken() && pScanner->PeekNextToken()->type == TT_VALUE) {
 				pScanner->PopNextToken();
-				pValue->Parse(pScanner);
+				pValue->Parse(pScanner, state);
 			}
 		}
 	}
 
-	void Map::ParseFlow(Scanner *pScanner)
+	void Map::ParseFlow(Scanner *pScanner, const ParserState& state)
 	{
 		// eat start token
 		pScanner->EatNextToken();
@@ -95,12 +95,12 @@ namespace YAML
 			m_data[pKey] = pValue;
 
 			// grab key
-			pKey->Parse(pScanner);
+			pKey->Parse(pScanner, state);
 
 			// now grab value (optional)
 			if(pScanner->PeekNextToken() && pScanner->PeekNextToken()->type == TT_VALUE) {
 				pScanner->PopNextToken();
-				pValue->Parse(pScanner);
+				pValue->Parse(pScanner, state);
 			}
 
 			// now eat the separator (or could be a map end, which we ignore - but if it's neither, then it's a bad node)

map.h

@@ -14,12 +14,12 @@ namespace YAML
 		virtual ~Map();
 
 		void Clear();
-		virtual void Parse(Scanner *pScanner);
+		virtual void Parse(Scanner *pScanner, const ParserState& state);
 		virtual void Write(std::ostream& out, int indent);
 
 	private:
-		void ParseBlock(Scanner *pScanner);
-		void ParseFlow(Scanner *pScanner);
+		void ParseBlock(Scanner *pScanner, const ParserState& state);
+		void ParseFlow(Scanner *pScanner, const ParserState& state);
 
 	protected:
 		typedef std::map <Node *, Node *> node_map;

node.cpp

@@ -25,11 +25,11 @@ namespace YAML
 		m_alias = false;
 	}
 
-	void Node::Parse(Scanner *pScanner)
+	void Node::Parse(Scanner *pScanner, const ParserState& state)
 	{
 		Clear();
 
-		ParseHeader(pScanner);
+		ParseHeader(pScanner, state);
 
 		// is this an alias? if so, it can have no content
 		if(m_alias)
@@ -43,24 +43,24 @@ namespace YAML
 		switch(pToken->type) {
 			case TT_SCALAR:
 				m_pContent = new Scalar;
-				m_pContent->Parse(pScanner);
+				m_pContent->Parse(pScanner, state);
 				break;
 			case TT_FLOW_SEQ_START:
 			case TT_BLOCK_SEQ_START:
 			case TT_BLOCK_ENTRY:
 				m_pContent = new Sequence;
-				m_pContent->Parse(pScanner);
+				m_pContent->Parse(pScanner, state);
 				break;
 			case TT_FLOW_MAP_START:
 			case TT_BLOCK_MAP_START:
 				m_pContent = new Map;
-				m_pContent->Parse(pScanner);
+				m_pContent->Parse(pScanner, state);
 		}
 	}
 
 	// ParseHeader
 	// . Grabs any tag, alias, or anchor tokens and deals with them.
-	void Node::ParseHeader(Scanner *pScanner)
+	void Node::ParseHeader(Scanner *pScanner, const ParserState& state)
 	{
 		while(1) {
 			Token *pToken = pScanner->PeekNextToken();
@@ -68,26 +68,27 @@ namespace YAML
 				break;
 
 			switch(pToken->type) {
-				case TT_TAG: ParseTag(pScanner); break;
-				case TT_ANCHOR: ParseAnchor(pScanner); break;
-				case TT_ALIAS: ParseAlias(pScanner); break;
+				case TT_TAG: ParseTag(pScanner, state); break;
+				case TT_ANCHOR: ParseAnchor(pScanner, state); break;
+				case TT_ALIAS: ParseAlias(pScanner, state); break;
 			}
 		}
 	}
 
-	void Node::ParseTag(Scanner *pScanner)
+	void Node::ParseTag(Scanner *pScanner, const ParserState& state)
 	{
 		if(m_tag != "")
 			return;  // TODO: throw
 
 		Token *pToken = pScanner->PeekNextToken();
-		m_tag = pToken->value;
+		m_tag = state.TranslateTag(pToken->value);
+
 		for(unsigned i=0;i<pToken->params.size();i++)
 			m_tag += pToken->params[i];
 		pScanner->PopNextToken();
 	}
 	
-	void Node::ParseAnchor(Scanner *pScanner)
+	void Node::ParseAnchor(Scanner *pScanner, const ParserState& state)
 	{
 		if(m_anchor != "")
 			return;  // TODO: throw
@@ -98,7 +99,7 @@ namespace YAML
 		pScanner->PopNextToken();
 	}
 
-	void Node::ParseAlias(Scanner *pScanner)
+	void Node::ParseAlias(Scanner *pScanner, const ParserState& state)
 	{
 		if(m_anchor != "")
 			return;  // TODO: throw

node.h

@@ -2,6 +2,7 @@
 
 #include <string>
 #include <ios>
+#include "parserstate.h"
 
 namespace YAML
 {
@@ -19,14 +20,14 @@ namespace YAML
 		~Node();
 
 		void Clear();
-		void Parse(Scanner *pScanner);
+		void Parse(Scanner *pScanner, const ParserState& state);
 		void Write(std::ostream& out, int indent);
 
 	private:
-		void ParseHeader(Scanner *pScanner);
-		void ParseTag(Scanner *pScanner);
-		void ParseAnchor(Scanner *pScanner);
-		void ParseAlias(Scanner *pScanner);
+		void ParseHeader(Scanner *pScanner, const ParserState& state);
+		void ParseTag(Scanner *pScanner, const ParserState& state);
+		void ParseAnchor(Scanner *pScanner, const ParserState& state);
+		void ParseAlias(Scanner *pScanner, const ParserState& state);
 
 	private:
 		bool m_alias;

parser.cpp

 #include "parser.h"
 #include "scanner.h"
 #include "token.h"
-#include <iostream>
+#include <sstream>
 
 namespace YAML
 {
 	Parser::Parser(std::istream& in): m_pScanner(0)
 	{
 		m_pScanner = new Scanner(in);
+		m_state.Reset();
 	}
 
 	Parser::~Parser()
@@ -15,19 +16,82 @@ namespace YAML
 		delete m_pScanner;
 	}
 
+	Parser::operator bool() const
+	{
+		return m_pScanner->PeekNextToken() != 0;
+	}
+
 	void Parser::GetNextDocument(Document& document)
 	{
-		document.Parse(m_pScanner);
+		// first read directives
+		ParseDirectives();
+
+		// then parse the document
+		document.Parse(m_pScanner, m_state);
+	}
+
+	void Parser::ParseDirectives()
+	{
+		bool readDirective = false;
+
+		while(1) {
+			Token *pToken = m_pScanner->PeekNextToken();
+			if(!pToken || pToken->type != TT_DIRECTIVE)
+				break;
+
+			// we keep the directives from the last document if none are specified;
+			// but if any directives are specific, then we reset them
+			if(!readDirective)
+				m_state.Reset();
+
+			readDirective = true;
+			HandleDirective(pToken->value, pToken->params);
+			m_pScanner->PopNextToken();
+		}
+	}
+
+	void Parser::HandleDirective(const std::string& name, const std::vector <std::string>& params)
+	{
+		if(name == "YAML")
+			HandleYamlDirective(params);
+		else if(name == "TAG")
+			HandleTagDirective(params);
+	}
+
+	// HandleYamlDirective
+	// . Should be of the form 'major.minor' (like a version number)
+	void Parser::HandleYamlDirective(const std::vector <std::string>& params)
+	{
+		if(params.empty())
+			return;  // TODO: throw? (or throw on params.size() > 1?)
+
+		std::stringstream str(params[0]);
+		str >> m_state.version.major;
+		str.get();
+		str >> m_state.version.minor;
+		if(!str)
+			return;  // TODO: throw? (or throw if there are any more characters in the stream?)
+
+		// TODO: throw on major > 1? warning on major == 1, minor > 1?
+	}
+
+	void Parser::HandleTagDirective(const std::vector <std::string>& params)
+	{
+		if(params.size() != 2)
+			return;  // TODO: throw?
+
+		std::string handle = params[0], prefix = params[1];
+		m_state.tags[handle] = prefix;
 	}
 
-	void Parser::PrintTokens()
+	void Parser::PrintTokens(std::ostream& out)
 	{
 		while(1) {
 			Token *pToken = m_pScanner->GetNextToken();
 			if(!pToken)
 				break;
 
-			std::cout << *pToken << std::endl;
+			out << *pToken << std::endl;
 		}
 	}
 }

parser.h

 #pragma once
 
 #include <ios>
+#include <string>
+#include <vector>
+#include <map>
 #include "document.h"
+#include "parserstate.h"
 
 namespace YAML
 {
@@ -14,10 +18,19 @@ namespace YAML
 		Parser(std::istream& in);
 		~Parser();
 
+		operator bool() const;
+
 		void GetNextDocument(Document& document);
-		void PrintTokens();
+		void PrintTokens(std::ostream& out);
+
+	private:
+		void ParseDirectives();
+		void HandleDirective(const std::string& name, const std::vector <std::string>& params);
+		void HandleYamlDirective(const std::vector <std::string>& params);
+		void HandleTagDirective(const std::vector <std::string>& params);
 
 	private:
 		Scanner *m_pScanner;
+		ParserState m_state;
 	};
 }

parserstate.cpp

+#include "parserstate.h"
+
+namespace YAML
+{
+	void ParserState::Reset()
+	{
+		// version
+		version.major = 1;
+		version.minor = 1;
+
+		// and tags
+		tags.clear();
+		tags["!"] = "!";
+		tags["!!"] = "tag:yaml.org,2002:";
+	}
+
+	std::string ParserState::TranslateTag(const std::string& handle) const
+	{
+		std::map <std::string, std::string>::const_iterator it = tags.find(handle);
+		if(it == tags.end())
+			return handle;
+
+		return it->second;
+	}
+}

parserstate.h

+#pragma once
+
+#include <string>
+#include <map>
+
+namespace YAML
+{
+	struct Version {
+		int major, minor;
+	};
+
+	struct ParserState
+	{
+		Version version;
+		std::map <std::string, std::string> tags;
+
+		void Reset();
+		std::string TranslateTag(const std::string& handle) const;
+	};
+}

scalar.cpp

@@ -12,7 +12,7 @@ namespace YAML
 	{
 	}
 
-	void Scalar::Parse(Scanner *pScanner)
+	void Scalar::Parse(Scanner *pScanner, const ParserState& state)
 	{
 		Token *pToken = pScanner->GetNextToken();
 		m_data = pToken->value;

scalar.h

@@ -11,7 +11,7 @@ namespace YAML
 		Scalar();
 		virtual ~Scalar();
 
-		virtual void Parse(Scanner *pScanner);
+		virtual void Parse(Scanner *pScanner, const ParserState& state);
 		virtual void Write(std::ostream& out, int indent);
 
 	protected:

scantoken.cpp

@@ -189,7 +189,7 @@ namespace YAML
 	void Scanner::ScanAnchorOrAlias()
 	{
 		bool alias;
-		std::string tag;
+		std::string name;
 
 		// insert a potential simple key
 		if(m_simpleKeyAllowed)
@@ -202,10 +202,10 @@ namespace YAML
 
 		// now eat the content
 		while(Exp::AlphaNumeric.Matches(INPUT))
-			tag += INPUT.get();
+			name += INPUT.get();
 
 		// we need to have read SOMETHING!
-		if(tag.empty())
+		if(name.empty())
 			throw AnchorNotFound();
 
 		// and needs to end correctly
@@ -214,7 +214,7 @@ namespace YAML
 
 		// and we're done
 		Token *pToken = new Token(alias ? TT_ALIAS : TT_ANCHOR);
-		pToken->value = tag;
+		pToken->value = name;
 		m_tokens.push(pToken);
 	}
 
@@ -229,7 +229,7 @@ namespace YAML
 		m_simpleKeyAllowed = false;
 
 		// eat the indicator
-		INPUT.eat(1);
+		handle += INPUT.get();
 
 		// read the handle
 		while(INPUT.peek() != EOF && INPUT.peek() != Keys::Tag && !Exp::BlankOrBreak.Matches(INPUT))
@@ -238,11 +238,15 @@ namespace YAML
 		// is there a suffix?
 		if(INPUT.peek() == Keys::Tag) {
 			// eat the indicator
-			INPUT.eat(1);
+			handle += INPUT.get();
 
 			// then read it
 			while(INPUT.peek() != EOF && !Exp::BlankOrBreak.Matches(INPUT))
 				suffix += INPUT.get();
+		} else {
+			// this is a bit weird: we keep just the '!' as the handle and move the rest to the suffix
+			suffix = handle.substr(1);
+			handle = "!";
 		}
 
 		Token *pToken = new Token(TT_TAG);

sequence.cpp

@@ -22,7 +22,7 @@ namespace YAML
 		m_data.clear();
 	}
 
-	void Sequence::Parse(Scanner *pScanner)
+	void Sequence::Parse(Scanner *pScanner, const ParserState& state)
 	{
 		Clear();
 
@@ -30,13 +30,13 @@ namespace YAML
 		Token *pToken = pScanner->PeekNextToken();
 
 		switch(pToken->type) {
-			case TT_BLOCK_SEQ_START: ParseBlock(pScanner); break;
-			case TT_BLOCK_ENTRY: ParseImplicit(pScanner); break;
-			case TT_FLOW_SEQ_START: ParseFlow(pScanner); break;
+			case TT_BLOCK_SEQ_START: ParseBlock(pScanner, state); break;
+			case TT_BLOCK_ENTRY: ParseImplicit(pScanner, state); break;
+			case TT_FLOW_SEQ_START: ParseFlow(pScanner, state); break;
 		}
 	}
 
-	void Sequence::ParseBlock(Scanner *pScanner)
+	void Sequence::ParseBlock(Scanner *pScanner, const ParserState& state)
 	{
 		// eat start token
 		pScanner->EatNextToken();
@@ -55,11 +55,11 @@ namespace YAML
 
 			Node *pNode = new Node;
 			m_data.push_back(pNode);
-			pNode->Parse(pScanner);
+			pNode->Parse(pScanner, state);
 		}
 	}
 
-	void Sequence::ParseImplicit(Scanner *pScanner)
+	void Sequence::ParseImplicit(Scanner *pScanner, const ParserState& state)
 	{
 		while(1) {
 			Token *pToken = pScanner->PeekNextToken();
@@ -75,11 +75,11 @@ namespace YAML
 
 			Node *pNode = new Node;
 			m_data.push_back(pNode);
-			pNode->Parse(pScanner);
+			pNode->Parse(pScanner, state);
 		}
 	}
 
-	void Sequence::ParseFlow(Scanner *pScanner)
+	void Sequence::ParseFlow(Scanner *pScanner, const ParserState& state)
 	{
 		// eat start token
 		pScanner->EatNextToken();
@@ -98,7 +98,7 @@ namespace YAML
 			// then read the node
 			Node *pNode = new Node;
 			m_data.push_back(pNode);
-			pNode->Parse(pScanner);
+			pNode->Parse(pScanner, state);
 
 			// now eat the separator (or could be a sequence end, which we ignore - but if it's neither, then it's a bad node)
 			pToken = pScanner->PeekNextToken();

sequence.h

@@ -14,13 +14,13 @@ namespace YAML
 		virtual ~Sequence();
 
 		void Clear();
-		virtual void Parse(Scanner *pScanner);
+		virtual void Parse(Scanner *pScanner, const ParserState& state);
 		virtual void Write(std::ostream& out, int indent);
 
 	private:
-		void ParseBlock(Scanner *pScanner);
-		void ParseImplicit(Scanner *pScanner);
-		void ParseFlow(Scanner *pScanner);
+		void ParseBlock(Scanner *pScanner, const ParserState& state);
+		void ParseImplicit(Scanner *pScanner, const ParserState& state);
+		void ParseFlow(Scanner *pScanner, const ParserState& state);
 
 	protected:
 		std::vector <Node *> m_data;

test.yaml

---- !<tag:clarkevans.com,2002:invoice>
-invoice: 34843
-date   : 2001-01-23
-bill-to: &id001
-    given  : Chris
-    family : Dumars
-    address:
-        lines: |
-            458 Walkman Dr.
-            Suite #292
-        city    : Royal Oak
-        state   : MI
-        postal  : 48046
-ship-to: *id001
-product:
-    - sku         : BL394D
-      quantity    : 4
-      description : Basketball
-      price       : 450.00
-    - sku         : BL4438H
-      quantity    : 1
-      description : Super Hoop
-      price       : 2392.00
-tax  : 251.42
-total: 4443.52
-comments:
-    Late afternoon is best.
-    Backup contact is Nancy
-    Billsmer @ 338-4338.
+---
+model:
+    file: data/models/compound.model
+    textures: data/materials/compound
+rooms:
+    - name: "Room #1"
+      pos: [0, 0, 0]
+      size: [1000, 1000, 500]
+      height: 500
+      stairtype: none
+      display: []
+      pathfinding:
+          tilesize: 50
+          size: [24, 24]
+          map: |
+              -----------------------
+              -+++++++++++++++++++++-
+              -+-------------------+-
+              -+-------------------+-
+              -+-------------------+-
+              -+-------------------+-
+              -+-------------------+-
+              -+-------------------+-
+              -+-------------------+-
+              -+-------------------+-
+              -+---------------------
+              -+---------------------
+              -+---------------------
+              -+---------------------
\ No newline at end of file
+              -+-------------------+-
+              -+-------------------+-
+              -+-------------------+-
+              -+-------------------+-
+              -+-------------------+-
+              -+-------------------+-
+              -+-------------------+-
+              -+-------------------+-
+              -+++++++++++++++++++++-
+              -----------------------
+    - name: Doorway
+      pos: [1000, 400, 0]
+      size: [50, 200, 500]
+      height: 500
+      stairtype: none
+      display: []
+      pathfinding:
+          tilesize: 50
+          size: [5, 9]
+          map: |
+              -----
+              -+++-
+              -----
+              -----
+              -----
+              -----
+              -----
+              -+++-
+              -----
+    - name: "Room #2"
+      pos: [1050, 0, 0]
+      size: [1000, 1000, 500]
+      height: 500
+      stairtype: none
+      display: []
+      pathfinding:
+          tilesize: 50
+          size: [24, 24]
+          map: |
+              -----------------------
+              -+++++++++++++++++++++-
+              -+-------------------+-
+              -+-------------------+-
+              -+-------------------+-
+              -+-------------------+-
+              -+-------------------+-
+              -+-------------------+-
+              -+-------------------+-
+              -+-------------------+-
+              ---------------------+-
+              ---------------------+-
+              ---------------------+-
+              ---------------------+-
+              -+-------------------+-
+              -+-------------------+-
+              -+-------------------+-
+              -+-------------------+-
+              -+-------------------+-
+              -+-------------------+-
+              -+-------------------+-
+              -+-------------------+-
+              -+++++++++++++++++++++-
+              -----------------------
+exits:
+    - room1: "Room #1"
+      room2: "Room #2"
+      dir: e
+      pos: [400, 600]

yaml-reader.vcproj

@@ -204,6 +204,10 @@
 					RelativePath=".\parser.cpp"
 					>
 				</File>
+				<File
+					RelativePath=".\parserstate.cpp"
+					>
+				</File>
 			</Filter>
 			<Filter
 				Name="Representation"
@@ -278,6 +282,10 @@
 					RelativePath=".\parser.h"
 					>
 				</File>
+				<File
+					RelativePath=".\parserstate.h"
+					>
+				</File>
 			</Filter>
 			<Filter
 				Name="Representation"