Env: Add more native functions

src/environment.cpp

@@ -57,6 +57,16 @@ GlobalEnvironment::GlobalEnvironment()
 	sub();
 	mul();
 	div();
+
+	lt();
+	lte();
+	gt();
+	gte();
+
+	list();
+	is_list();
+	is_empty();
+	count();
 }
 
 } // namespace blaze

src/environment.h

@@ -38,11 +38,22 @@ public:
 	virtual ~GlobalEnvironment() = default;
 
 private:
-	// TODO: Add more native functions
-	void add();
-	void sub();
-	void mul();
-	void div();
+	void add(); // +
+	void sub(); // -
+	void mul(); // *
+	void div(); // /
+
+	void lt();  // <
+	void lte(); // <=
+	void gt();  // >
+	void gte(); // >=
+
+	void list();     // list
+	void is_list();  // list?
+	void is_empty(); // empty?
+	void count();    // count
+
+	// void equal(); // =
 };
 
 } // namespace blaze

src/functions.cpp

@@ -38,8 +38,6 @@ void GlobalEnvironment::add()
 void GlobalEnvironment::sub()
 {
 	auto sub = [](std::span<ASTNodePtr> nodes) -> ASTNodePtr {
-		int64_t result = 0;
-
 		if (nodes.size() == 0) {
 			return makePtr<Number>(0);
 		}
@@ -52,7 +50,7 @@ void GlobalEnvironment::sub()
 		}
 
 		// Start with the first number
-		result += std::static_pointer_cast<Number>(nodes[0])->number();
+		int64_t result = std::static_pointer_cast<Number>(nodes[0])->number();
 
 		// Skip the first node
 		for (auto it = std::next(nodes.begin()); it != nodes.end(); ++it) {
@@ -88,8 +86,6 @@ void GlobalEnvironment::mul()
 void GlobalEnvironment::div()
 {
 	auto div = [this](std::span<ASTNodePtr> nodes) -> ASTNodePtr {
-		double result = 0;
-
 		if (nodes.size() == 0) {
 			Error::the().addError(format("wrong number of arguments: {}, 0", m_current_key));
 			return nullptr;
@@ -103,7 +99,7 @@ void GlobalEnvironment::div()
 		}
 
 		// Start with the first number
-		result += std::static_pointer_cast<Number>(nodes[0])->number();
+		double result = std::static_pointer_cast<Number>(nodes[0])->number();
 
 		// Skip the first node
 		for (auto it = std::next(nodes.begin()); it != nodes.end(); ++it) {
@@ -116,4 +112,144 @@ void GlobalEnvironment::div()
 	m_values.emplace("/", makePtr<Function>(div));
 }
 
+// -----------------------------------------
+
+#define NUMBER_COMPARE(symbol, comparison_symbol)                                                                \
+	auto lambda = [this](std::span<ASTNodePtr> nodes) -> ASTNodePtr {                                            \
+		bool result = true;                                                                                      \
+                                                                                                                 \
+		if (nodes.size() < 2) {                                                                                  \
+			Error::the().addError(format("wrong number of arguments: {}, {}", m_current_key, nodes.size() - 1)); \
+			return nullptr;                                                                                      \
+		}                                                                                                        \
+                                                                                                                 \
+		for (auto node : nodes) {                                                                                \
+			if (!is<Number>(node.get())) {                                                                       \
+				Error::the().addError(format("wrong argument type: number, '{}'", node));                        \
+				return nullptr;                                                                                  \
+			}                                                                                                    \
+		}                                                                                                        \
+                                                                                                                 \
+		/* Start with the first number */                                                                        \
+		int64_t number = std::static_pointer_cast<Number>(nodes[0])->number();                                   \
+                                                                                                                 \
+		/* Skip the first node */                                                                                \
+		for (auto it = std::next(nodes.begin()); it != nodes.end(); ++it) {                                      \
+			int64_t current_number = std::static_pointer_cast<Number>(*it)->number();                            \
+			if (number comparison_symbol current_number) {                                                       \
+				result = false;                                                                                  \
+				break;                                                                                           \
+			}                                                                                                    \
+			number = current_number;                                                                             \
+		}                                                                                                        \
+                                                                                                                 \
+		return makePtr<Value>((result) ? Value::True : Value::False);                                            \
+	};                                                                                                           \
+                                                                                                                 \
+	m_values.emplace(symbol, makePtr<Function>(lambda));
+
+void GlobalEnvironment::lt()
+{
+	NUMBER_COMPARE("<", >=);
+}
+
+void GlobalEnvironment::lte()
+{
+	NUMBER_COMPARE("<=", >);
+}
+
+void GlobalEnvironment::gt()
+{
+	NUMBER_COMPARE(">", <=);
+}
+
+void GlobalEnvironment::gte()
+{
+	NUMBER_COMPARE(">=", <);
+}
+
+// -----------------------------------------
+
+void GlobalEnvironment::list()
+{
+	auto list = [](std::span<ASTNodePtr> nodes) -> ASTNodePtr {
+		auto list = makePtr<List>();
+
+		for (auto node : nodes) {
+			list->addNode(node);
+		}
+
+		return list;
+	};
+
+	m_values.emplace("list", makePtr<Function>(list));
+}
+
+void GlobalEnvironment::is_list()
+{
+	auto is_list = [](std::span<ASTNodePtr> nodes) -> ASTNodePtr {
+		bool result = true;
+
+		for (auto node : nodes) {
+			if (!is<List>(node.get())) {
+				result = false;
+				break;
+			}
+		}
+
+		return makePtr<Value>((result) ? Value::True : Value::False);
+	};
+
+	m_values.emplace("list?", makePtr<Function>(is_list));
+}
+
+void GlobalEnvironment::is_empty()
+{
+	auto is_empty = [](std::span<ASTNodePtr> nodes) -> ASTNodePtr {
+		bool result = true;
+
+		for (auto node : nodes) {
+			if (!is<List>(node.get())) {
+				Error::the().addError(format("wrong argument type: list, '{}'", node));
+				return nullptr;
+			}
+
+			if (!std::static_pointer_cast<List>(node)->empty()) {
+				result = false;
+				break;
+			}
+		}
+
+		return makePtr<Value>((result) ? Value::True : Value::False);
+	};
+
+	m_values.emplace("empty?", makePtr<Function>(is_empty));
+}
+
+void GlobalEnvironment::count()
+{
+	auto count = [this](std::span<ASTNodePtr> nodes) -> ASTNodePtr {
+		if (nodes.size() > 1) {
+			Error::the().addError(format("wrong number of arguments: {}, {}", m_current_key, nodes.size() - 1));
+			return nullptr;
+		}
+
+		size_t result = 0;
+
+		for (auto node : nodes) {
+			if (!is<List>(node.get())) {
+				Error::the().addError(format("wrong argument type: list, '{}'", node));
+				return nullptr;
+			}
+
+			result = std::static_pointer_cast<List>(node)->size();
+		}
+
+		// FIXME: Add numeric_limits check for implicit cast: size_t > int64_t
+		return makePtr<Number>((int64_t)result);
+	};
+
+	m_values.emplace("count", makePtr<Function>(count));
+}
+
 } // namespace blaze

src/step3_env.cpp

@@ -16,7 +16,7 @@
 #include "readline.h"
 #include "settings.h"
 
-#if 1
+#if 0
 static blaze::EnvironmentPtr env = blaze::makePtr<blaze::GlobalEnvironment>();
 
 auto read(std::string_view input) -> blaze::ASTNodePtr

src/step4_if_fn_do.cpp

@@ -0,0 +1,108 @@
+#include <csignal> // std::signal
+#include <cstdlib> // std::exit
+#include <string>
+#include <string_view>
+
+#include "ruc/argparser.h"
+#include "ruc/format/color.h"
+
+#include "ast.h"
+#include "environment.h"
+#include "error.h"
+#include "eval.h"
+#include "lexer.h"
+#include "printer.h"
+#include "reader.h"
+#include "readline.h"
+#include "settings.h"
+
+#if 1
+static blaze::EnvironmentPtr env = blaze::makePtr<blaze::GlobalEnvironment>();
+
+auto read(std::string_view input) -> blaze::ASTNodePtr
+{
+	blaze::Lexer lexer(input);
+	lexer.tokenize();
+	if (blaze::Settings::the().get("dump-lexer") == "1") {
+		lexer.dump();
+	}
+
+	blaze::Reader reader(std::move(lexer.tokens()));
+	reader.read();
+	if (blaze::Settings::the().get("dump-reader") == "1") {
+		reader.dump();
+	}
+
+	return reader.node();
+}
+
+auto eval(blaze::ASTNodePtr ast) -> blaze::ASTNodePtr
+{
+	blaze::Eval eval(ast, env);
+	eval.eval();
+
+	return eval.ast();
+}
+
+auto print(blaze::ASTNodePtr exp) -> std::string
+{
+	blaze::Printer printer;
+
+	return printer.print(exp);
+}
+
+auto rep(std::string_view input) -> std::string
+{
+	blaze::Error::the().clearErrors();
+	blaze::Error::the().setInput(input);
+
+	return print(eval(read(input)));
+}
+
+static auto cleanup(int signal) -> void
+{
+	print("\033[0m\n");
+	std::exit(signal);
+}
+
+auto main(int argc, char* argv[]) -> int
+{
+	bool dump_lexer = false;
+	bool dump_reader = false;
+	bool pretty_print = false;
+	std::string_view history_path = "~/.mal-history";
+
+	// CLI arguments
+	ruc::ArgParser arg_parser;
+	arg_parser.addOption(dump_lexer, 'l', "dump-lexer", nullptr, nullptr);
+	arg_parser.addOption(dump_reader, 'r', "dump-reader", nullptr, nullptr);
+	arg_parser.addOption(pretty_print, 'c', "color", nullptr, nullptr);
+	arg_parser.addOption(history_path, 'h', "history", nullptr, nullptr, nullptr, ruc::ArgParser::Required::Yes);
+	arg_parser.parse(argc, argv);
+
+	// Set settings
+	blaze::Settings::the().set("dump-lexer", dump_lexer ? "1" : "0");
+	blaze::Settings::the().set("dump-reader", dump_reader ? "1" : "0");
+	blaze::Settings::the().set("pretty-print", pretty_print ? "1" : "0");
+
+	// Signal callbacks
+	std::signal(SIGINT, cleanup);
+	std::signal(SIGTERM, cleanup);
+
+	blaze::Readline readline(pretty_print, history_path);
+
+	std::string input;
+	while (readline.get(input)) {
+		if (pretty_print) {
+			print("\033[0m");
+		}
+		print("{}\n", rep(input));
+	}
+
+	if (pretty_print) {
+		print("\033[0m");
+	}
+
+	return 0;
+}
+#endif