Modularize implementation

1 files changed, 57 insertions, 0 deletions

diff --git a/src/definition.d b/src/definition.d
new file mode 100644
index 0000000..dd4dddc
--- /dev/null
+++ b/src/definition.d
@@ -0,0 +1,57 @@
+module src.definition;
+
+import std.string;
+import std.variant;
+import std.typecons;
+import std.container : DList;
+
+import src.stack : Token;
+
+alias Words = DList!Token[string];
+
+Nullable!(DList!Token) definition;
+Words                  words;
+
+void start() {
+	definition = DList!Token();
+}
+
+void end() {
+	string wordToBeDefined;
+
+	definition.front.visit!(
+		(int    x   ) => wordToBeDefined = "",
+		(string name) => wordToBeDefined = name
+	);
+
+	if ( wordToBeDefined == "" ) {
+		throw new Exception("words may not be numeric");
+	}
+
+	definition.removeFront;
+	words[wordToBeDefined] = definition;
+	definition.nullify;
+}
+
+bool handle(int value) {
+	if ( definition.isNull ) {
+		return false;
+	} else {
+		definition.insertBack(Token(value));
+		return true;
+	}
+}
+
+bool handle(string word) {
+	if ( definition.isNull ) {
+		return false;
+	} else {
+		if ( word == ";" ) {
+			end();
+		} else {
+			definition.insertBack(Token(word));
+		}
+
+		return true;
+	}
+}