json based animation toy

experimental/docs/jsonReader.cpp

+/*
+ * Copyright 2006 The Android Open Source Project
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkTArray.h"
+#include "SkTDict.h"
+#include "SkString.h"
+
+enum ReadState {
+    kRoot_ReadState,
+
+};
+
+static bool isToken(const char* s, const char* e) {
+    SkASSERT(s < e);
+    while (s < e) {
+        char c = *s++;
+        char u = c & ~0x20;
+        if ((u < 'A' || u > 'Z') && (c < '0' || c > '9') && c != '_') {
+            return false;
+        }
+    }
+    return true;
+}
+
+static void skpWhiteSpace(const char** strPtr) {
+    const char* str = *strPtr;
+    while (*str && *str <= ' ') {
+        str++;
+    }
+    *strPtr = str;
+}
+
+static void ReadRoot(const char** strPtr) {
+    skipWhiteSpace(strPtr);
+    const char* str = *strPtr;
+    const char kVarStr[] = "var ";
+    SkASSERT(SkStrStartsWith(str, kVarStr));
+    const char* rootVar = str + sizeof(kVarStr) - 1;
+    const char* rootEnd = strchr(rootVar, ' ');
+    SkASSERT(rootEnd);
+    SkASSERT(isToken(rootVar, rootEnd));
+    const char* rootAssign = rootEnd;
+    skipWhiteSpace(rootAssign);
+    SkASSERT(rootAssign[0] == '=');
+    const char* rootData = rootAssign + 1;
+    SkASSERT(rootData[0]);
+    skipWhiteSpace(rootData);
+    if (rootData[0] == '{') {
+        addObject(rootVar, rootEnd);
+    } else if (rootData[0] == '[') {
+        addArray(rootVar, rootEnd);
+    } else {
+        SkASSERT(0);
+    }
+    *strPtr = str;
+}
+
+static void reader(const char* str) {
+    while (*str) {
+        ReadRoot(&str);
+    }
+}