From c6d2b259a4f253403929f6f1104395a6a71b1be6 Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Fri, 14 Apr 2017 23:21:51 +0200
Subject: Convert structure to _dub_ build system

---
 source/base/stack.d | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 source/base/stack.d

(limited to 'source/base/stack.d')

diff --git a/source/base/stack.d b/source/base/stack.d
new file mode 100644
index 0000000..253bac0
--- /dev/null
+++ b/source/base/stack.d
@@ -0,0 +1,48 @@
+module base.stack;
+
+import std.conv;
+import std.string;
+import std.variant;
+import std.container : SList;
+
+import definition = base.definition;
+
+alias Token = Algebraic!(int, bool, string);
+alias Stack = SList;
+
+Stack!Token stack;
+
+Token toToken(string value) {
+	if ( value.isNumeric ) {
+		return Token(parse!int(value));
+	} else {
+		return Token(value);
+	}
+}
+
+Token top(ref Stack!Token stack) {
+	if ( stack.empty ) {
+		throw new Exception("stack is empty");
+	} else {
+		return stack.front;
+	}
+}
+
+Token pop(ref Stack!Token stack) {
+	Token token = stack.top;
+	stack.removeFront;
+	return token;
+}
+
+void push(ref Stack!Token stack, Token token) {
+	if ( !definition.handle(token) ) {
+		stack.insertFront(token);
+	}
+}
+
+template push(T)
+if ( is(T == int) || is(T == bool) || is (T == string) ) {
+	void push(ref Stack!Token stack, T value) {
+		stack.push(Token(value));
+	}
+}
-- 
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