initial checkin of SkSL compiler

src/sksl/ast/SkSLASTVarDeclaration.h

+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+ 
+#ifndef SKSL_ASTVARDECLARATION
+#define SKSL_ASTVARDECLARATION
+
+#include "SkSLASTDeclaration.h"
+#include "SkSLASTModifiers.h"
+#include "SkSLASTStatement.h"
+#include "SkSLASTType.h"
+#include "../SkSLUtil.h"
+
+namespace SkSL {
+
+/**
+ * A variable declaration, which may consist of multiple individual variables. For instance
+ * 'int x, y = 1, z[4][2]' is a single ASTVarDeclaration. This declaration would have a type of 
+ * 'int', names ['x', 'y', 'z'], sizes of [[], [], [4, 2]], and values of [null, 1, null].
+ */
+struct ASTVarDeclaration : public ASTDeclaration {
+    ASTVarDeclaration(ASTModifiers modifiers, 
+                      std::unique_ptr<ASTType> type, 
+                      std::vector<std::string> names, 
+                      std::vector<std::vector<std::unique_ptr<ASTExpression>>> sizes,
+                      std::vector<std::unique_ptr<ASTExpression>> values)
+    : INHERITED(type->fPosition, kVar_Kind)
+    , fModifiers(modifiers)
+    , fType(std::move(type))
+    , fNames(std::move(names))
+    , fSizes(std::move(sizes))
+    , fValues(std::move(values)) {
+        ASSERT(fNames.size() == fValues.size());
+    }
+
+    std::string description() const override {
+        std::string result = fModifiers.description() + fType->description() + " ";
+        std::string separator = "";
+        for (size_t i = 0; i < fNames.size(); i++) {
+            result += separator;
+            separator = ", ";
+            result += fNames[i];
+            for (size_t j = 0; j < fSizes[i].size(); j++) {
+                if (fSizes[i][j]) {
+                    result += "[" + fSizes[i][j]->description() + "]";
+                } else {
+                    result += "[]";
+                }
+            }
+            if (fValues[i]) {
+                result += " = " + fValues[i]->description();
+            }
+        }
+        return result;        
+    }
+
+    const ASTModifiers fModifiers;
+    const std::unique_ptr<ASTType> fType;
+    const std::vector<std::string> fNames;
+    const std::vector<std::vector<std::unique_ptr<ASTExpression>>> fSizes;
+    const std::vector<std::unique_ptr<ASTExpression>> fValues;
+
+    typedef ASTDeclaration INHERITED;
+};
+
+} // namespace
+
+#endif