Some more helpful utility parsers

- Rename VectorParser -> ScalarSequenceParser
- Add Vector3Parser and ColorParser, subclasses of the above, which handle
  Vector3s and Colors

src/yaml/vectorParser.cc

@@ -0,0 +1,57 @@
+/* vectorParser.cc
+ * vim: set tw=80:
+ * Eryn Wells <eryn@erynwells.me>
+ */
+
+#include <cassert>
+
+#include "yaml/vectorParser.hh"
+
+
+namespace yaml {
+
+Vector3Parser::Vector3Parser(Scene& scene,
+                             ParserStack& parsers,
+                             CallbackFunction onDone)
+    : ScalarSequenceParser(scene, parsers)
+{
+    auto onSeqDone = [this, onDone](std::vector<double> seq) {
+        if (seq.size() != 3) {
+            assert(seq.size() != 3);
+            return;
+        }
+        onDone(Vector3(seq[0], seq[1], seq[2]));
+    };
+    SetCallback(onSeqDone);
+}
+
+
+Vector3Parser::~Vector3Parser()
+{ }
+
+
+ColorParser::ColorParser(Scene& scene,
+                         ParserStack& parsers,
+                         CallbackFunction onDone)
+    : ScalarSequenceParser(scene, parsers)
+{
+    auto onSeqDone = [this, onDone](std::vector<double> seq) {
+        size_t seqSize = seq.size();
+        if (seqSize == 3) {
+            onDone(Color(seq[0], seq[1], seq[2]));
+        }
+        else if (seqSize == 4) {
+            onDone(Color(seq[0], seq[1], seq[2], seq[3]));
+        }
+        else {
+            assert(seqSize != 3 || seqSize != 4);
+        }
+    };
+    SetCallback(onSeqDone);
+}
+
+
+ColorParser::~ColorParser()
+{ }
+
+} /* namespace yaml */