[SVGDom] Initial SVGLength support

Mostly plumb new length types, but also introduce a stateful parser,
rect shape and named color support.

R=reed@google.com,robertphillips@google.com,stephana@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2202053002

Review-Url: https://codereview.chromium.org/2202053002

1 files changed, 45 insertions, 0 deletions

diff --git a/experimental/svg/model/SkSVGAttributeParser.h b/experimental/svg/model/SkSVGAttributeParser.h
new file mode 100644
index 0000000000..aef0286504
--- /dev/null
+++ b/experimental/svg/model/SkSVGAttributeParser.h
@@ -0,0 +1,45 @@
+/*
+ * 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 SkSVGAttributeParser_DEFINED
+#define SkSVGAttributeParser_DEFINED
+
+#include "SkSVGTypes.h"
+
+class SkSVGAttributeParser : public SkNoncopyable {
+public:
+    SkSVGAttributeParser(const char[]);
+
+    bool parseColor(SkSVGColor*);
+    bool parseNumber(SkSVGNumber*);
+    bool parseLength(SkSVGLength*);
+
+private:
+    // Stack-only
+    void* operator new(size_t) = delete;
+    void* operator new(size_t, void*) = delete;
+
+    template <typename F>
+    bool advanceWhile(F func);
+
+    bool parseWSToken();
+    bool parseEOSToken();
+    bool parseSepToken();
+    bool parseExpectedStringToken(const char*);
+    bool parseScalarToken(SkScalar*);
+    bool parseHexToken(uint32_t*);
+    bool parseLengthUnitToken(SkSVGLength::Unit*);
+    bool parseNamedColorToken(SkColor*);
+    bool parseHexColorToken(SkColor*);
+
+    // The current position in the input string.
+    const char* fCurPos;
+
+    typedef SkNoncopyable INHERITED;
+};
+
+#endif // SkSVGAttributeParser_DEFINED