1 files changed, 121 insertions, 5 deletions

diff --git a/src/sdlang/util.d b/src/sdlang/util.d
index 329e387..d192ea2 100644
--- a/src/sdlang/util.d
+++ b/src/sdlang/util.d
@@ -4,10 +4,14 @@
 module sdlang.util;
 
 import std.algorithm;
+import std.array;
+import std.conv;
 import std.datetime;
+import std.range;
 import std.stdio;
 import std.string;
 
+import sdlang.exception;
 import sdlang.token;
 
 enum sdlangVersion = "0.9.1";
@@ -26,14 +30,14 @@ struct Location
 	int line; /// Zero-indexed
 	int col;  /// Zero-indexed, Tab counts as 1
 	size_t index; /// Index into the source
-	
+
 	this(int line, int col, int index)
 	{
 		this.line  = line;
 		this.col   = col;
 		this.index = index;
 	}
-	
+
 	this(string file, int line, int col, int index)
 	{
 		this.file  = file;
@@ -41,12 +45,106 @@ struct Location
 		this.col   = col;
 		this.index = index;
 	}
-	
+
+	/// Convert to string. Optionally takes output range as a sink.
+	string toString()
+	{
+		Appender!string sink;
+		this.toString(sink);
+		return sink.data;
+	}
+
+	///ditto
+	void toString(Sink)(ref Sink sink) if(isOutputRange!(Sink,char))
+	{
+		sink.put(file);
+		sink.put("(");
+		sink.put(to!string(line+1));
+		sink.put(":");
+		sink.put(to!string(col+1));
+		sink.put(")");
+	}
+}
+
+struct FullName
+{
+	string namespace;
+	string name;
+
+	/// Convert to string. Optionally takes output range as a sink.
 	string toString()
 	{
-		return "%s(%s:%s)".format(file, line+1, col+1);
+		if(namespace == "")
+			return name;
+
+		Appender!string sink;
+		this.toString(sink);
+		return sink.data;
+	}
+
+	///ditto
+	void toString(Sink)(ref Sink sink) if(isOutputRange!(Sink,char))
+	{
+		if(namespace != "")
+		{
+			sink.put(namespace);
+			sink.put(":");
+		}
+
+		sink.put(name);
+	}
+
+	///
+	static string combine(string namespace, string name)
+	{
+		return FullName(namespace, name).toString();
+	}
+	///
+	@("FullName.combine example")
+	unittest
+	{
+		assert(FullName.combine("", "name") == "name");
+		assert(FullName.combine("*", "name") == "*:name");
+		assert(FullName.combine("namespace", "name") == "namespace:name");
+	}
+
+	///
+	static FullName parse(string fullName)
+	{
+		FullName result;
+		
+		auto parts = fullName.findSplit(":");
+		if(parts[1] == "") // No colon
+		{
+			result.namespace = "";
+			result.name      = parts[0];
+		}
+		else
+		{
+			result.namespace = parts[0];
+			result.name      = parts[2];
+		}
+
+		return result;
+	}
+	///
+	@("FullName.parse example")
+	unittest
+	{
+		assert(FullName.parse("name") == FullName("", "name"));
+		assert(FullName.parse("*:name") == FullName("*", "name"));
+		assert(FullName.parse("namespace:name") == FullName("namespace", "name"));
+	}
+
+	/// Throws with appropriate message if this.name is "*".
+	/// Wildcards are only supported for namespaces, not names.
+	void ensureNoWildcardName(string extaMsg = null)
+	{
+		if(name == "*")
+			throw new ArgumentException(`Wildcards ("*") only allowed for namespaces, not names. `~extaMsg);
 	}
 }
+struct Foo { string foo; }
 
 void removeIndex(E)(ref E[] arr, ptrdiff_t index)
 {
@@ -79,6 +177,24 @@ string toString(TypeInfo ti)
 	else if(ti == typeid( Duration     )) return "Duration";
 	else if(ti == typeid( ubyte[]      )) return "ubyte[]";
 	else if(ti == typeid( typeof(null) )) return "null";
-	
+
 	return "{unknown}";
 }
+
+enum BOM {
+	UTF8,           /// UTF-8
+	UTF16LE,        /// UTF-16 (little-endian)
+	UTF16BE,        /// UTF-16 (big-endian)
+	UTF32LE,        /// UTF-32 (little-endian)
+	UTF32BE,        /// UTF-32 (big-endian)
+}
+
+enum NBOM = __traits(allMembers, BOM).length;
+immutable ubyte[][NBOM] ByteOrderMarks =
+[
+	[0xEF, 0xBB, 0xBF],         //UTF8
+	[0xFF, 0xFE],               //UTF16LE
+	[0xFE, 0xFF],               //UTF16BE
+	[0xFF, 0xFE, 0x00, 0x00],   //UTF32LE
+	[0x00, 0x00, 0xFE, 0xFF]    //UTF32BE
+];