Added parsing of anchors, aliases, and tags (still no semantics yet).

Fixed a silly bug in the simple key pushing (queues are FIFO!).

map.cpp

@@ -10,28 +10,37 @@ namespace YAML
 	}
 
 	Map::~Map()
+	{
+		Clear();
+	}
+
+	void Map::Clear()
 	{
 		for(node_map::const_iterator it=m_data.begin();it!=m_data.end();++it) {
 			delete it->first;
 			delete it->second;
 		}
+		m_data.clear();
 	}
 
 	void Map::Parse(Scanner *pScanner)
 	{
-		// grab start token
-		Token *pToken = pScanner->GetNextToken();
+		Clear();
+
+		// split based on start token
+		Token *pToken = pScanner->PeekNextToken();
 
 		switch(pToken->type) {
 			case TT_BLOCK_MAP_START: ParseBlock(pScanner); break;
 			case TT_FLOW_MAP_START: ParseFlow(pScanner); break;
 		}
-
-		delete pToken;
 	}
 
 	void Map::ParseBlock(Scanner *pScanner)
 	{
+		// eat start token
+		pScanner->EatNextToken();
+
 		while(1) {
 			Token *pToken = pScanner->PeekNextToken();
 			if(!pToken)
@@ -61,6 +70,9 @@ namespace YAML
 
 	void Map::ParseFlow(Scanner *pScanner)
 	{
+		// eat start token
+		pScanner->EatNextToken();
+
 		while(1) {
 			Token *pToken = pScanner->PeekNextToken();
 			if(!pToken)

map.h

@@ -13,6 +13,7 @@ namespace YAML
 		Map();
 		virtual ~Map();
 
+		void Clear();
 		virtual void Parse(Scanner *pScanner);
 		virtual void Write(std::ostream& out, int indent);
 

node.cpp

@@ -9,7 +9,7 @@
 
 namespace YAML
 {
-	Node::Node(): m_pContent(0)
+	Node::Node(): m_pContent(0), m_alias(false)
 	{
 	}
 
@@ -22,12 +22,19 @@ namespace YAML
 	{
 		delete m_pContent;
 		m_pContent = 0;
+		m_alias = false;
 	}
 
 	void Node::Parse(Scanner *pScanner)
 	{
+		Clear();
+
 		ParseHeader(pScanner);
 
+		// is this an alias? if so, it can have no content
+		if(m_alias)
+			return;
+
 		// now split based on what kind of node we should be
 		Token *pToken = pScanner->PeekNextToken();
 		if(pToken->type == TT_DOC_END)
@@ -57,29 +64,75 @@ namespace YAML
 	{
 		while(1) {
 			Token *pToken = pScanner->PeekNextToken();
-			if(!pToken || pToken->type != TT_TAG || pToken->type != TT_ANCHOR || pToken->type != TT_ALIAS)
+			if(!pToken || (pToken->type != TT_TAG && pToken->type != TT_ANCHOR && pToken->type != TT_ALIAS))
 				break;
 
-			pScanner->PopNextToken();
 			switch(pToken->type) {
-				case TT_TAG:
-					break;
-				case TT_ANCHOR:
-					break;
-				case TT_ALIAS:
-					break;
+				case TT_TAG: ParseTag(pScanner); break;
+				case TT_ANCHOR: ParseAnchor(pScanner); break;
+				case TT_ALIAS: ParseAlias(pScanner); break;
 			}
-			delete pToken;
 		}
 	}
 
+	void Node::ParseTag(Scanner *pScanner)
+	{
+		if(m_tag != "")
+			return;  // TODO: throw
+
+		Token *pToken = pScanner->PeekNextToken();
+		m_tag = pToken->value;
+		for(unsigned i=0;i<pToken->params.size();i++)
+			m_tag += pToken->params[i];
+		pScanner->PopNextToken();
+	}
+	
+	void Node::ParseAnchor(Scanner *pScanner)
+	{
+		if(m_anchor != "")
+			return;  // TODO: throw
+
+		Token *pToken = pScanner->PeekNextToken();
+		m_anchor = pToken->value;
+		m_alias = false;
+		pScanner->PopNextToken();
+	}
+
+	void Node::ParseAlias(Scanner *pScanner)
+	{
+		if(m_anchor != "")
+			return;  // TODO: throw
+		if(m_tag != "")
+			return;  // TODO: throw (aliases can't have any content, *including* tags)
+
+		Token *pToken = pScanner->PeekNextToken();
+		m_anchor = pToken->value;
+		m_alias = true;
+		pScanner->PopNextToken();
+	}
+
 	void Node::Write(std::ostream& out, int indent)
 	{
+		if(m_tag != "") {
+			for(int i=0;i<indent;i++)
+				out << "  ";
+			out << "{tag: " << m_tag << "}\n";
+		}
+		if(m_anchor != "") {
+			for(int i=0;i<indent;i++)
+				out << "  ";
+			if(m_alias)
+				out << "{alias: " << m_anchor << "}\n";
+			else
+				out << "{anchor: " << m_anchor << "}\n";
+		}
+
 		if(!m_pContent) {
 			for(int i=0;i<indent;i++)
 				out << "  ";
 			out << "{no content}\n";
-		} else
+		} else {
 			m_pContent->Write(out, indent);
+		}
 	}
 }

node.h

@@ -24,9 +24,13 @@ namespace YAML
 
 	private:
 		void ParseHeader(Scanner *pScanner);
+		void ParseTag(Scanner *pScanner);
+		void ParseAnchor(Scanner *pScanner);
+		void ParseAlias(Scanner *pScanner);
 
 	private:
-		std::string m_tag;
+		bool m_alias;
+		std::string m_anchor, m_tag;
 		Content *m_pContent;
 	};
 }

parser.cpp

@@ -1,5 +1,7 @@
 #include "parser.h"
 #include "scanner.h"
+#include "token.h"
+#include <iostream>
 
 namespace YAML
 {
@@ -17,4 +19,15 @@ namespace YAML
 	{
 		document.Parse(m_pScanner);
 	}
+
+	void Parser::PrintTokens()
+	{
+		while(1) {
+			Token *pToken = m_pScanner->GetNextToken();
+			if(!pToken)
+				break;
+
+			std::cout << *pToken << std::endl;
+		}
+	}
 }

parser.h

@@ -15,6 +15,7 @@ namespace YAML
 		~Parser();
 
 		void GetNextDocument(Document& document);
+		void PrintTokens();
 
 	private:
 		Scanner *m_pScanner;

scanner.cpp

@@ -254,12 +254,14 @@ namespace YAML
 
 		// now push
 		m_indents.push(column);
+		Token *pToken = 0;
 		if(sequence)
-			m_tokens.push(new Token(TT_BLOCK_SEQ_START));
+			pToken = new Token(TT_BLOCK_SEQ_START);
 		else
-			m_tokens.push(new Token(TT_BLOCK_MAP_START));
+			pToken = new Token(TT_BLOCK_MAP_START);
 
-		return m_tokens.front();
+		m_tokens.push(pToken);
+		return pToken;
 	}
 
 	// PopIndentTo

sequence.cpp

@@ -11,27 +11,36 @@ namespace YAML
 	}
 
 	Sequence::~Sequence()
+	{
+		Clear();
+	}
+
+	void Sequence::Clear()
 	{
 		for(unsigned i=0;i<m_data.size();i++)
 			delete m_data[i];
+		m_data.clear();
 	}
 
 	void Sequence::Parse(Scanner *pScanner)
 	{
-		// grab start token
-		Token *pToken = pScanner->GetNextToken();
+		Clear();
+
+		// split based on start token
+		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;
 		}
-
-		delete pToken;
 	}
 
 	void Sequence::ParseBlock(Scanner *pScanner)
 	{
+		// eat start token
+		pScanner->EatNextToken();
+
 		while(1) {
 			Token *pToken = pScanner->PeekNextToken();
 			if(!pToken)
@@ -52,11 +61,29 @@ namespace YAML
 
 	void Sequence::ParseImplicit(Scanner *pScanner)
 	{
-		// TODO
+		while(1) {
+			Token *pToken = pScanner->PeekNextToken();
+			// we're actually *allowed* to have no tokens at some point
+			if(!pToken)
+				break;
+
+			// and we end at anything other than a block entry
+			if(pToken->type != TT_BLOCK_ENTRY)
+				break;
+
+			pScanner->PopNextToken();
+
+			Node *pNode = new Node;
+			m_data.push_back(pNode);
+			pNode->Parse(pScanner);
+		}
 	}
 
 	void Sequence::ParseFlow(Scanner *pScanner)
 	{
+		// eat start token
+		pScanner->EatNextToken();
+
 		while(1) {
 			Token *pToken = pScanner->PeekNextToken();
 			if(!pToken)

sequence.h

@@ -13,6 +13,7 @@ namespace YAML
 		Sequence();
 		virtual ~Sequence();
 
+		void Clear();
 		virtual void Parse(Scanner *pScanner);
 		virtual void Write(std::ostream& out, int indent);
 

test.yaml

@@ -1,10 +1,29 @@
----
-here's a sequence:
-  - item 1
-  - item 2
-now an inline sequence: [1, 2, 3]
-and here's a map:
-  name: Jesse
-  age: 23
-and here's an inline map: {state: Illinois, city: Urbana-Champaign}
-...
+--- !<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.