Everywhere: Add Keyword parsing

src/ast.cpp

@@ -5,6 +5,7 @@
  */
 
 #include <cstdint> // int64_t
+#include <string>
 
 #include "ast.h"
 
@@ -31,6 +32,13 @@ String::String(const std::string& data)
 
 // -----------------------------------------
 
+Keyword::Keyword(const std::string& data)
+	: m_data(data)
+{
+}
+
+// -----------------------------------------
+
 Number::Number(int64_t number)
 	: m_number(number)
 {
@@ -43,4 +51,11 @@ Symbol::Symbol(const std::string& symbol)
 {
 }
 
+// -----------------------------------------
+
+Value::Value(const std::string& value)
+	: m_value(value)
+{
+}
+
 } // namespace blaze

src/ast.h

@@ -28,9 +28,11 @@ public:
 	virtual bool isHashMap() const { return false; }
 	virtual bool isList() const { return false; }
 	virtual bool isString() const { return false; }
+	virtual bool isKeyword() const { return false; }
 	virtual bool isNumber() const { return false; }
-	virtual bool isSpecialSymbol() const { return false; }
+	virtual bool isValue() const { return false; }
 	virtual bool isSymbol() const { return false; }
+	virtual bool isFunction() const { return false; }
 
 protected:
 	ASTNode() {}
@@ -109,6 +111,21 @@ private:
 
 // -----------------------------------------
 
+// :keyword
+class Keyword final : public ASTNode {
+public:
+	Keyword(const std::string& data);
+	virtual ~Keyword() = default;
+
+	virtual bool isKeyword() const override { return true; }
+
+	const std::string& keyword() const { return m_data; }
+
+private:
+	std::string m_data;
+};
+
+// -----------------------------------------
 // 123
 class Number final : public ASTNode {
 public:
@@ -125,13 +142,15 @@ private:
 
 // -----------------------------------------
 
-// true, false, nil
-class SpecialSymbol final : public ASTNode {
+// Symbols
+class Symbol final : public ASTNode {
 public:
-	SpecialSymbol();
-	virtual ~SpecialSymbol();
+	Symbol(const std::string& symbol);
+	virtual ~Symbol() = default;
 
-	virtual bool isSpecialSymbol() const override { return true; }
+	virtual bool isSymbol() const override { return true; }
+
+	const std::string& symbol() const { return m_symbol; }
 
 private:
 	std::string m_symbol;
@@ -139,18 +158,19 @@ private:
 
 // -----------------------------------------
 
-// Other symbols
-class Symbol final : public ASTNode {
+// true, false, nil
+class Value final : public ASTNode {
 public:
-	Symbol(const std::string& symbol);
-	virtual ~Symbol() = default;
+	Value(const std::string& value);
+	virtual ~Value() = default;
 
-	virtual bool isSymbol() const override { return true; }
+	virtual bool isValue() const override { return true; }
 
-	std::string symbol() const { return m_symbol; }
+	const std::string& value() const { return m_value; }
 
 private:
-	std::string m_symbol;
+	std::string m_value;
+};
 };
 
 // -----------------------------------------
@@ -172,13 +192,16 @@ template<>
 inline bool ASTNode::fastIs<String>() const { return isString(); }
 
 template<>
-inline bool ASTNode::fastIs<Number>() const { return isNumber(); }
+inline bool ASTNode::fastIs<Keyword>() const { return isKeyword(); }
 
 template<>
-inline bool ASTNode::fastIs<SpecialSymbol>() const { return isSpecialSymbol(); }
+inline bool ASTNode::fastIs<Number>() const { return isNumber(); }
 
 template<>
 inline bool ASTNode::fastIs<Symbol>() const { return isSymbol(); }
+
+template<>
+inline bool ASTNode::fastIs<Value>() const { return isValue(); }
 // clang-format on
 
 } // namespace blaze

src/lexer.cpp

@@ -5,7 +5,7 @@
  */
 
 #include <algorithm>
-#include <string>
+#include <string> // std::to_string
 #include <unordered_set>
 
 #include "ruc/format/print.h"
@@ -73,6 +73,11 @@ void Lexer::tokenize()
 				return;
 			}
 			break;
+		case ':':
+			if (!consumeKeyword()) {
+				return;
+			}
+			break;
 		case ';':
 			consumeComment();
 			break;
@@ -162,14 +167,28 @@ bool Lexer::consumeString()
 	return true;
 }
 
-bool Lexer::consumeComment()
+bool Lexer::consumeKeyword()
 {
 	size_t column = m_column;
-	std::string comment = "";
+	std::string keyword;
+	keyword += 0x7f; // 127
 
-	ignore(); // ;
+	ignore(); // :
 
 	static std::unordered_set<char> exit = {
+		'[',
+		']',
+		'{',
+		'}',
+		'(',
+		')',
+		'\'',
+		'`',
+		',',
+		'"',
+		';',
+		' ',
+		'\t',
 		'\r',
 		'\n',
 		'\0',
@@ -183,17 +202,13 @@ bool Lexer::consumeComment()
 			break;
 		}
 
-		comment += character;
+		keyword += character;
 		ignore();
 	}
 
-	// Trim comment
-	comment.erase(comment.begin(),
-	              std::find_if(comment.begin(), comment.end(), [](char c) { return !std::isspace(c); }));
-	comment.erase(std::find_if(comment.rbegin(), comment.rend(), [](char c) { return !std::isspace(c); }).base(),
-	              comment.end());
+	m_tokens.push_back({ Token::Type::Keyword, m_line, column, keyword });
 
-	m_tokens.push_back({ Token::Type::Comment, m_line, column, comment });
+	retreat();
 
 	return true;
 }
@@ -241,6 +256,42 @@ bool Lexer::consumeValue()
 	return true;
 }
 
+bool Lexer::consumeComment()
+{
+	size_t column = m_column;
+	std::string comment = "";
+
+	ignore(); // ;
+
+	static std::unordered_set<char> exit = {
+		'\r',
+		'\n',
+		'\0',
+	};
+
+	char character = 0;
+	for (;;) {
+		character = peek();
+
+		if (exit.find(character) != exit.end()) {
+			break;
+		}
+
+		comment += character;
+		ignore();
+	}
+
+	// Trim comment
+	comment.erase(comment.begin(),
+	              std::find_if(comment.begin(), comment.end(), [](char c) { return !std::isspace(c); }));
+	comment.erase(std::find_if(comment.rbegin(), comment.rend(), [](char c) { return !std::isspace(c); }).base(),
+	              comment.end());
+
+	m_tokens.push_back({ Token::Type::Comment, m_line, column, comment });
+
+	return true;
+}
+
 void Lexer::dump() const
 {
 	print("tokens: {}\n", m_tokens.size());

src/lexer.h

@@ -32,8 +32,9 @@ struct Token {
 		Caret,        // ^
 		At,           // @
 		String,       // "foobar"
+		Keyword,      // :keyword
+		Value,        // numbers, "true", "false", and "nil", symbols
 		Comment,      // ;
-		Value,        // symbols, numbers, "true", "false", and "nil"
 		Error,
 	};
 
@@ -58,8 +59,9 @@ public:
 private:
 	bool consumeSpliceUnquoteOrUnquote(); // ~@ or ~
 	bool consumeString();
-	bool consumeComment();
+	bool consumeKeyword();
 	bool consumeValue();
+	bool consumeComment();
 
 	size_t m_column { 0 };
 	size_t m_line { 0 };
@@ -68,44 +70,3 @@ private:
 };
 
 } // namespace blaze
-
-// ~^@
-// (+ 2 (* 3 4))
-
-// Lexing -> creates tokens
-// Parsing -> creates AST
-
-// class Thing1 {
-// public:
-// 	std::vector<int>& numbers() { return m_numbers; }
-
-// private:
-// 	std::vector<int> m_numbers;
-// };
-
-// class Thing2 {
-// public:
-// 	std::vector<int>&& numbers() { return std::move(m_numbers); }
-
-// private:
-// 	std::vector<int> m_numbers;
-// };
-
-// class OtherThing {
-// public:
-// 	OtherThing(std::vector<int>&& numbers) noexcept
-// 		: m_numbers(std::move(numbers))
-// 	{
-// 	}
-
-// private:
-// 	std::vector<int> m_numbers;
-// };
-
-// int main()
-// {
-// 	Thing1 thing1;
-// 	Thing2 thing2;
-// 	OtherThing other_thing(std::move(thing1.numbers()));
-// 	OtherThing other_thing2(thing2.numbers());
-// }

src/printer.cpp

@@ -88,6 +88,10 @@ void Printer::dumpImpl(ASTNode* node)
 		printSpacing();
 		print("{}", static_cast<String*>(node)->data());
 	}
+	else if (is<Keyword>(node)) {
+		printSpacing();
+		print(":{}", static_cast<Keyword*>(node)->keyword().substr(1));
+	}
 	else if (is<Number>(node)) {
 		printSpacing();
 		print("{}", static_cast<Number*>(node)->number());

src/reader.cpp

@@ -117,14 +117,17 @@ ASTNode* Reader::readImpl()
 	case Token::Type::At: // @
 		return readDeref();
 		break;
-	case Token::Type::String:
+	case Token::Type::String: // "foobar"
 		return readString();
 		break;
+	case Token::Type::Keyword: // :keyword
+		return readKeyword();
+		break;
 	case Token::Type::Comment: // ;
 		ignore();
 		return nullptr;
 		break;
-	case Token::Type::Value:
+	case Token::Type::Value: // true, false, nil
 		return readValue();
 		break;
 	default:
@@ -301,6 +304,11 @@ ASTNode* Reader::readString()
 	return new String(symbol);
 }
 
+ASTNode* Reader::readKeyword()
+{
+	return new Keyword(consume().symbol);
+}
+
 ASTNode* Reader::readValue()
 {
 	Token token = consume();

src/reader.h

@@ -45,7 +45,8 @@ private:
 	ASTNode* readWithMeta();      // ^
 	ASTNode* readDeref();         // @
 	ASTNode* readString();        // "foobar"
-	ASTNode* readValue();
+	ASTNode* readKeyword();       // :keyword
+	ASTNode* readValue();         // true, false, nil
 
 	void dumpImpl(ASTNode* node);