initial checkin of SkSL compiler

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1984363002
CQ_EXTRA_TRYBOTS=client.skia.compile:Build-Ubuntu-GCC-x86_64-Release-CMake-Trybot,Build-Mac-Clang-x86_64-Release-CMake-Trybot

Review-Url: https://codereview.chromium.org/1984363002

1 files changed, 70 insertions, 0 deletions

diff --git a/src/sksl/ast/SkSLASTModifiers.h b/src/sksl/ast/SkSLASTModifiers.h
new file mode 100644
index 0000000000..6ef29aa72a
--- /dev/null
+++ b/src/sksl/ast/SkSLASTModifiers.h
@@ -0,0 +1,70 @@
+/*
+ * 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_ASTMODIFIERS
+#define SKSL_ASTMODIFIERS
+
+#include "SkSLASTLayout.h"
+#include "SkSLASTNode.h"
+
+namespace SkSL {
+
+/**
+ * A set of modifier keywords (in, out, uniform, etc.) appearing before a declaration. 
+ */
+struct ASTModifiers : public ASTNode {
+    enum Flag {
+        kNo_Flag      =  0,
+        kConst_Flag   =  1,
+        kIn_Flag      =  2,
+        kOut_Flag     =  4,
+        kLowp_Flag    =  8,
+        kMediump_Flag = 16,
+        kHighp_Flag   = 32,
+        kUniform_Flag = 64
+    };
+
+    ASTModifiers(ASTLayout layout, int flags)
+    : fLayout(layout)
+    , fFlags(flags) {}
+
+    std::string description() const override {
+        std::string result = fLayout.description();
+        if (fFlags & kUniform_Flag) {
+            result += "uniform ";
+        }
+        if (fFlags & kConst_Flag) {
+            result += "const ";
+        }
+        if (fFlags & kLowp_Flag) {
+            result += "lowp ";
+        }
+        if (fFlags & kMediump_Flag) {
+            result += "mediump ";
+        }
+        if (fFlags & kHighp_Flag) {
+            result += "highp ";
+        }
+
+        if ((fFlags & kIn_Flag) && (fFlags & kOut_Flag)) {
+            result += "inout ";
+        } else if (fFlags & kIn_Flag) {
+            result += "in ";
+        } else if (fFlags & kOut_Flag) {
+            result += "out ";
+        }
+
+        return result;
+    }
+
+    const ASTLayout fLayout;
+    const int fFlags;
+};
+
+} // namespace
+
+#endif