From 42b9b8616301e331e0a7d4bcfeaafa1b087a8362 Mon Sep 17 00:00:00 2001
From: John Hodge <tpg@mutabah.net>
Date: Mon, 16 May 2016 22:16:36 +0800
Subject: HIR - Ticking along - Generics hacked up, on to patterns

---
 src/hir/pattern.hpp | 47 ++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 46 insertions(+), 1 deletion(-)

(limited to 'src/hir/pattern.hpp')

diff --git a/src/hir/pattern.hpp b/src/hir/pattern.hpp
index 4fa262ce..2ff0a0d2 100644
--- a/src/hir/pattern.hpp
+++ b/src/hir/pattern.hpp
@@ -2,9 +2,54 @@
  */
 #pragma once
 
+#include <memory>
+#include <vector>
+#include <tagged_union.hpp>
+#include <hir/path.hpp>
+#include <hir/type.hpp>
+
 namespace HIR {
 
-class Pattern {
+struct PatternBinding
+{
+    ::std::string   m_name;
+    unsigned int    m_slot;
+    
+    bool is_valid() const { return m_name == ""; }
+};
+
+struct Pattern
+{
+    TAGGED_UNION(Value, String,
+        (Integer, struct {
+            enum ::HIR::CoreType type;
+            uint64_t value; // Signed numbers are encoded as 2's complement
+            }),
+        (String, ::std::string),
+        (Named, Path)
+        );
+
+    TAGGED_UNION(Data, Any,
+        (Any,       struct { } ),
+        (Box,       struct { ::std::unique_ptr<Pattern> sub; }),
+        (Ref,       struct { bool mut; ::std::unique_ptr<Pattern> sub; } ),
+        (Value,     struct { Value val; } ),
+        (Range,     struct { Value start; Value end; } ),
+        (Tuple,     struct { ::std::vector<Pattern> sub_patterns; } ),
+        (StructTuple, struct { GenericPath path; ::std::vector<Pattern> sub_patterns; } ),
+        (Struct,    struct { GenericPath path; ::std::vector< ::std::pair< ::std::string, Pattern> > sub_patterns; } ),
+        (Slice,     struct {
+            ::std::vector<Pattern> leading;
+            } ),
+        (SplitSlice, struct {
+            ::std::vector<Pattern> leading;
+            PatternBinding extra_bind;
+            ::std::vector<Pattern> trailing;
+            } )
+        );
+
+    PatternBinding  m_binding;
+    Data    m_data;
 };
 
 }
-- 
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