Wire up the Inspector V8 Debugger

sky/engine/core/inspector/JSONParser.cpp

Index: sky/engine/core/inspector/JSONParser.cpp
diff --git a/sky/engine/core/inspector/JSONParser.cpp b/sky/engine/core/inspector/JSONParser.cpp
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index 0000000000000000000000000000000000000000..1523888fb7565ea41fbc0ce6ad9e297e8b005c92
--- /dev/null
+++ b/sky/engine/core/inspector/JSONParser.cpp
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+/*
+ * Copyright (C) 2010 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "core/inspector/JSONParser.h"
+
+#include "platform/JSONValues.h"
+#include "wtf/text/StringBuilder.h"
+
+namespace blink {
+
+namespace {
+
+const int stackLimit = 1000;
+
+enum Token {
+    ObjectBegin,
+    ObjectEnd,
+    ArrayBegin,
+    ArrayEnd,
+    StringLiteral,
+    Number,
+    BoolTrue,
+    BoolFalse,
+    NullToken,
+    ListSeparator,
+    ObjectPairSeparator,
+    InvalidToken,
+};
+
+const char* const nullString = "null";
+const char* const trueString = "true";
+const char* const falseString = "false";
+
+template<typename CharType>
+bool parseConstToken(const CharType* start, const CharType* end, const CharType** tokenEnd, const char* token)
+{
+    while (start < end && *token != '\0' && *start++ == *token++) { }
+    if (*token != '\0')
+        return false;
+    *tokenEnd = start;
+    return true;
+}
+
+template<typename CharType>
+bool readInt(const CharType* start, const CharType* end, const CharType** tokenEnd, bool canHaveLeadingZeros)
+{
+    if (start == end)
+        return false;
+    bool haveLeadingZero = '0' == *start;
+    int length = 0;
+    while (start < end && '0' <= *start && *start <= '9') {
+        ++start;
+        ++length;
+    }
+    if (!length)
+        return false;
+    if (!canHaveLeadingZeros && length > 1 && haveLeadingZero)
+        return false;
+    *tokenEnd = start;
+    return true;
+}
+
+template<typename CharType>
+bool parseNumberToken(const CharType* start, const CharType* end, const CharType** tokenEnd)
+{
+    // We just grab the number here. We validate the size in DecodeNumber.
+    // According to RFC4627, a valid number is: [minus] int [frac] [exp]
+    if (start == end)
+        return false;
+    CharType c = *start;
+    if ('-' == c)
+        ++start;
+
+    if (!readInt(start, end, &start, false))
+        return false;
+    if (start == end) {
+        *tokenEnd = start;
+        return true;
+    }
+
+    // Optional fraction part
+    c = *start;
+    if ('.' == c) {
+        ++start;
+        if (!readInt(start, end, &start, true))
+            return false;
+        if (start == end) {
+            *tokenEnd = start;
+            return true;
+        }
+        c = *start;
+    }
+
+    // Optional exponent part
+    if ('e' == c || 'E' == c) {
+        ++start;
+        if (start == end)
+            return false;
+        c = *start;
+        if ('-' == c || '+' == c) {
+            ++start;
+            if (start == end)
+                return false;
+        }
+        if (!readInt(start, end, &start, true))
+            return false;
+    }
+
+    *tokenEnd = start;
+    return true;
+}
+
+template<typename CharType>
+bool readHexDigits(const CharType* start, const CharType* end, const CharType** tokenEnd, int digits)
+{
+    if (end - start < digits)
+        return false;
+    for (int i = 0; i < digits; ++i) {
+        CharType c = *start++;
+        if (!(('0' <= c && c <= '9') || ('a' <= c && c <= 'f') || ('A' <= c && c <= 'F')))
+            return false;
+    }
+    *tokenEnd = start;
+    return true;
+}
+
+template<typename CharType>
+bool parseStringToken(const CharType* start, const CharType* end, const CharType** tokenEnd)
+{
+    while (start < end) {
+        CharType c = *start++;
+        if ('\\' == c) {
+            c = *start++;
+            // Make sure the escaped char is valid.
+            switch (c) {
+            case 'x':
+                if (!readHexDigits(start, end, &start, 2))
+                    return false;
+                break;
+            case 'u':
+                if (!readHexDigits(start, end, &start, 4))
+                    return false;
+                break;
+            case '\\':
+            case '/':
+            case 'b':
+            case 'f':
+            case 'n':
+            case 'r':
+            case 't':
+            case 'v':
+            case '"':
+                break;
+            default:
+                return false;
+            }
+        } else if ('"' == c) {
+            *tokenEnd = start;
+            return true;
+        }
+    }
+    return false;
+}
+
+template<typename CharType>
+Token parseToken(const CharType* start, const CharType* end, const CharType** tokenStart, const CharType** tokenEnd)
+{
+    while (start < end && isSpaceOrNewline(*start))
+        ++start;
+
+    if (start == end)
+        return InvalidToken;
+
+    *tokenStart = start;
+
+    switch (*start) {
+    case 'n':
+        if (parseConstToken(start, end, tokenEnd, nullString))
+            return NullToken;
+        break;
+    case 't':
+        if (parseConstToken(start, end, tokenEnd, trueString))
+            return BoolTrue;
+        break;
+    case 'f':
+        if (parseConstToken(start, end, tokenEnd, falseString))
+            return BoolFalse;
+        break;
+    case '[':
+        *tokenEnd = start + 1;
+        return ArrayBegin;
+    case ']':
+        *tokenEnd = start + 1;
+        return ArrayEnd;
+    case ',':
+        *tokenEnd = start + 1;
+        return ListSeparator;
+    case '{':
+        *tokenEnd = start + 1;
+        return ObjectBegin;
+    case '}':
+        *tokenEnd = start + 1;
+        return ObjectEnd;
+    case ':':
+        *tokenEnd = start + 1;
+        return ObjectPairSeparator;
+    case '0':
+    case '1':
+    case '2':
+    case '3':
+    case '4':
+    case '5':
+    case '6':
+    case '7':
+    case '8':
+    case '9':
+    case '-':
+        if (parseNumberToken(start, end, tokenEnd))
+            return Number;
+        break;
+    case '"':
+        if (parseStringToken(start + 1, end, tokenEnd))
+            return StringLiteral;
+        break;
+    }
+    return InvalidToken;
+}
+
+template<typename CharType>
+inline int hexToInt(CharType c)
+{
+    if ('0' <= c && c <= '9')
+        return c - '0';
+    if ('A' <= c && c <= 'F')
+        return c - 'A' + 10;
+    if ('a' <= c && c <= 'f')
+        return c - 'a' + 10;
+    ASSERT_NOT_REACHED();
+    return 0;
+}
+
+template<typename CharType>
+bool decodeString(const CharType* start, const CharType* end, StringBuilder* output)
+{
+    while (start < end) {
+        UChar c = *start++;
+        if ('\\' != c) {
+            output->append(c);
+            continue;
+        }
+        c = *start++;
+        switch (c) {
+        case '"':
+        case '/':
+        case '\\':
+            break;
+        case 'b':
+            c = '\b';
+            break;
+        case 'f':
+            c = '\f';
+            break;
+        case 'n':
+            c = '\n';
+            break;
+        case 'r':
+            c = '\r';
+            break;
+        case 't':
+            c = '\t';
+            break;
+        case 'v':
+            c = '\v';
+            break;
+        case 'x':
+            c = (hexToInt(*start) << 4) +
+                hexToInt(*(start + 1));
+            start += 2;
+            break;
+        case 'u':
+            c = (hexToInt(*start) << 12) +
+                (hexToInt(*(start + 1)) << 8) +
+                (hexToInt(*(start + 2)) << 4) +
+                hexToInt(*(start + 3));
+            start += 4;
+            break;
+        default:
+            return false;
+        }
+        output->append(c);
+    }
+    return true;
+}
+
+template<typename CharType>
+bool decodeString(const CharType* start, const CharType* end, String* output)
+{
+    if (start == end) {
+        *output = "";
+        return true;
+    }
+    if (start > end)
+        return false;
+    StringBuilder buffer;
+    buffer.reserveCapacity(end - start);
+    if (!decodeString(start, end, &buffer))
+        return false;
+    *output = buffer.toString();
+    return true;
+}
+
+template<typename CharType>
+PassRefPtr<JSONValue> buildValue(const CharType* start, const CharType* end, const CharType** valueTokenEnd, int depth)
+{
+    if (depth > stackLimit)
+        return nullptr;
+
+    RefPtr<JSONValue> result;
+    const CharType* tokenStart;
+    const CharType* tokenEnd;
+    Token token = parseToken(start, end, &tokenStart, &tokenEnd);
+    switch (token) {
+    case InvalidToken:
+        return nullptr;
+    case NullToken:
+        result = JSONValue::null();
+        break;
+    case BoolTrue:
+        result = JSONBasicValue::create(true);
+        break;
+    case BoolFalse:
+        result = JSONBasicValue::create(false);
+        break;
+    case Number: {
+        bool ok;
+        double value = charactersToDouble(tokenStart, tokenEnd - tokenStart, &ok);
+        if (!ok)
+            return nullptr;
+        result = JSONBasicValue::create(value);
+        break;
+    }
+    case StringLiteral: {
+        String value;
+        bool ok = decodeString(tokenStart + 1, tokenEnd - 1, &value);
+        if (!ok)
+            return nullptr;
+        result = JSONString::create(value);
+        break;
+    }
+    case ArrayBegin: {
+        RefPtr<JSONArray> array = JSONArray::create();
+        start = tokenEnd;
+        token = parseToken(start, end, &tokenStart, &tokenEnd);
+        while (token != ArrayEnd) {
+            RefPtr<JSONValue> arrayNode = buildValue(start, end, &tokenEnd, depth + 1);
+            if (!arrayNode)
+                return nullptr;
+            array->pushValue(arrayNode);
+
+            // After a list value, we expect a comma or the end of the list.
+            start = tokenEnd;
+            token = parseToken(start, end, &tokenStart, &tokenEnd);
+            if (token == ListSeparator) {
+                start = tokenEnd;
+                token = parseToken(start, end, &tokenStart, &tokenEnd);
+                if (token == ArrayEnd)
+                    return nullptr;
+            } else if (token != ArrayEnd) {
+                // Unexpected value after list value. Bail out.
+                return nullptr;
+            }
+        }
+        if (token != ArrayEnd)
+            return nullptr;
+        result = array.release();
+        break;
+    }
+    case ObjectBegin: {
+        RefPtr<JSONObject> object = JSONObject::create();
+        start = tokenEnd;
+        token = parseToken(start, end, &tokenStart, &tokenEnd);
+        while (token != ObjectEnd) {
+            if (token != StringLiteral)
+                return nullptr;
+            String key;
+            if (!decodeString(tokenStart + 1, tokenEnd - 1, &key))
+                return nullptr;
+            start = tokenEnd;
+
+            token = parseToken(start, end, &tokenStart, &tokenEnd);
+            if (token != ObjectPairSeparator)
+                return nullptr;
+            start = tokenEnd;
+
+            RefPtr<JSONValue> value = buildValue(start, end, &tokenEnd, depth + 1);
+            if (!value)
+                return nullptr;
+            object->setValue(key, value);
+            start = tokenEnd;
+
+            // After a key/value pair, we expect a comma or the end of the
+            // object.
+            token = parseToken(start, end, &tokenStart, &tokenEnd);
+            if (token == ListSeparator) {
+                start = tokenEnd;
+                token = parseToken(start, end, &tokenStart, &tokenEnd);
+                if (token == ObjectEnd)
+                    return nullptr;
+            } else if (token != ObjectEnd) {
+                // Unexpected value after last object value. Bail out.
+                return nullptr;
+            }
+        }
+        if (token != ObjectEnd)
+            return nullptr;
+        result = object.release();
+        break;
+    }
+
+    default:
+        // We got a token that's not a value.
+        return nullptr;
+    }
+    *valueTokenEnd = tokenEnd;
+    return result.release();
+}
+
+template<typename CharType>
+PassRefPtr<JSONValue> parseJSONInternal(const CharType* start, unsigned length)
+{
+    const CharType* end = start + length;
+    const CharType *tokenEnd;
+    RefPtr<JSONValue> value = buildValue(start, end, &tokenEnd, 0);
+    if (!value || tokenEnd != end)
+        return nullptr;
+    return value.release();
+}
+
+} // anonymous namespace
+
+PassRefPtr<JSONValue> parseJSON(const String& json)
+{
+    if (json.isEmpty())
+        return nullptr;
+    if (json.is8Bit())
+        return parseJSONInternal(json.characters8(), json.length());
+    return parseJSONInternal(json.characters16(), json.length());
+}
+
+} // namespace blink