jsonutils.java

一个extjs编写的代码

        boolean isValue = false;

        //
        int index = start;
        int len = data.length();

        //
        String key = "";
        String value = "";

        while (index < len) {
            char c = data.charAt(index);

            //System.out.println(c);
            if (c == '{') {
                if (jsonObject == null) {
                    jsonObject = new JsonObject(inputDatePattern);
                    //  jsonObject begin
                    isKey = true;
                    isValue = false;
                } else {
                    int end = cutJsonObject(data, index);
                    value = data.substring(index, end);
                    index = end - 1;
                    isKey = false;
                    isValue = true;

                    //System.out.println("end : " + end);
                    //System.out.println("value : " + value);
                }

                //
            } else if (c == '}') {
                // jsonObject end
                // value end
                isValue = false;
                isKey = true;

                char cc = value.trim().charAt(0);

                if (cc == '{') {
                    jsonObject.put(key, parseObject(value, 0));
                } else if (cc == '[') {
                    jsonObject.put(key, parseArray(value, 0));
                } else {
                    jsonObject.put(key, parseValue(value, 0));
                }

                key = "";
                value = "";

                break;
            } else if (c == '[') {
                int end = cutJsonArray(data, index);
                value = data.substring(0, end);
                index = end - 1;
                isKey = false;
                isValue = true;

                //
            } else if ((c == '"') || (c == '\'')) {
                int end = cutJsonString(data, index);

                if (isKey) {
                    key = data.substring(index, end);
                } else {
                    value = data.substring(index, end);
                }

                index = end - 1;

                // string begin or end
            } else if (c == ':') {
                // key end, value start
                isKey = false;
                isValue = true;
            } else if (c == ',') {
                // value end
                isValue = false;
                isKey = true;

                char cc = value.trim().charAt(0);

                if (cc == '{') {
                    jsonObject.put(key, parseObject(value, 0));
                } else if (cc == '[') {
                    jsonObject.put(key, parseArray(value, 0));
                }

                jsonObject.put(key, parseValue(value, 0));

                //System.out.println("key: " + key + ", value: " + value);
                //System.out.println(jsonObject);
                key = "";
                value = "";
            } else {
                if (isKey) {
                    key += c;
                } else if (isValue) {
                    value += c;
                }
            }

            index++;
        }

        return jsonObject;
    }

    public JsonArray parseArray(String data, int start) {
        //
        JsonArray jsonArray = null;

        //
        int index = start;
        int len = data.length();

        //
        String value = "";

        while (index < len) {
            char c = data.charAt(index);

            //System.out.println(c);
            if (c == '{') {
                int end = cutJsonObject(data, index);
                value = data.substring(index, end);
                index = end - 1;

                //
                //System.out.println("jsonObject begin: " + objectCount);
            } else if (c == '[') {
                if (jsonArray == null) {
                    jsonArray = new JsonArray();
                } else {
                    int end = cutJsonArray(data, index);
                    value = data.substring(index, end);
                    index = end - 1;
                }

                //  jsonArray begin
                //System.out.println("jsonArray begin: " + arrayCount);
            } else if ((c == '\'') || (c == '"')) {
                int end = cutJsonString(data, index);
                value = data.substring(index, end);
                index = end - 1;
            } else if (c == ']') {
                //  jsonArray end
                value = value.trim();

                //System.out.println(value);
                //System.out.println(jsonArray);
                if (value.length() > 0) {
                    // value end
                    char cc = value.charAt(0);

                    if (cc == '[') {
                        jsonArray.add(parseArray(value, 0));
                    } else if (cc == '{') {
                        jsonArray.add(parseObject(value, 0));
                    } else {
                        jsonArray.add(parseValue(value, 0));
                    }

                    //System.out.println(jsonArray);
                    value = "";
                }
            } else if (c == ',') {
                // value end
                char cc = value.trim().charAt(0);

                if (cc == '[') {
                    jsonArray.add(parseArray(value, 0));
                } else if (cc == '{') {
                    jsonArray.add(parseObject(value, 0));
                } else {
                    jsonArray.add(parseValue(value, 0));
                }

                //System.out.println("key: " + key + ", value: " + value);
                value = "";
            } else if (c == ' ') {
                // blank
                value += ' ';
            } else {
                value += c;
            }

            index++;
        }

        return jsonArray;
    }

    public JsonValue parseValue(String data, int start) {
        String value = data.trim();
        int len = value.length();
        char c = value.charAt(0);

        if ((c == '\'') || (c == '"')) {
            value = value.substring(1, len - 1);

            return new JsonValue(value, JsonValue.TYPE_STRING);
        } else {
            return new JsonValue(value);
        }
    }

    public static int cutJsonObject(String data, int start) {
        int len = data.length();
        int index = start;
        char c;

        int num = 0;

        while (index < len) {
            c = data.charAt(index);

            if (c == '{') {
                num++;
            } else if (c == '}') {
                num--;
            }

            index++;

            if (num == 0) {
                break;
            }
        }

        return index;
    }

    public static int cutJsonArray(String data, int start) {
        int len = data.length();
        int index = start;
        char c;

        int num = 0;

        while (index < len) {
            c = data.charAt(index);

            if (c == '[') {
                num++;
            } else if (c == ']') {
                num--;
            }

            index++;

            if (num == 0) {
                break;
            }
        }

        return index;
    }

    public static int cutJsonString(String data, int start) {
        boolean isChange = false;
        boolean isSingleQuote = true;

        if ('"' == data.charAt(start)) {
            isSingleQuote = false;
        } else {
            isSingleQuote = true;
        }

        int len = data.length();
        int index = start + 1;
        char c;

        while (index < len) {
            c = data.charAt(index);

            if (isChange) {
                isChange = false;
            } else {
                if (c == '\\') {
                    isChange = true;
                } else if (isSingleQuote && (c == '\'')) {
                    break;
                } else if (!isSingleQuote && (c == '"')) {
                    break;
                }
            }

            index++;
        }

        return index + 1;
    }
}