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GitHub Repository: hrydgard/ppsspp
 Path: blob/master/Common/Data/Format/JSONReader.h
Views: 1401
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#pragma once

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#include <cstring>

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#include <string>

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#include <vector>

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#include "ext/gason/gason.h"

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#include "Common/Common.h"

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namespace json {

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struct JsonGet {

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	JsonGet(const JsonValue &value) : value_(value) {}

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	int numChildren() const;

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	const JsonNode *get(const char *child_name) const;

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	const JsonNode *get(const char *child_name, JsonTag type) const;

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	const JsonNode *getArray(const char *child_name) const {

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		return get(child_name, JSON_ARRAY);

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	}

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	const JsonGet getDict(const char *child_name) const {

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		return JsonGet(get(child_name, JSON_OBJECT)->value);

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	}

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	const char *getStringOrNull(const char *child_name) const;

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	const char *getStringOr(const char *child_name, const char *default_value) const;

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	bool getString(const char *child_name, std::string *output) const;

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	bool getStringVector(std::vector<std::string> *vec) const;

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	double getFloat(const char *child_name) const;

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	double getFloat(const char *child_name, double default_value) const;

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	int getInt(const char *child_name) const;

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	int getInt(const char *child_name, int default_value) const;

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	bool getBool(const char *child_name) const;

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	bool getBool(const char *child_name, bool default_value) const;

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	bool hasChild(const char *child_name, JsonTag child_type) const {

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		return get(child_name, child_type) != nullptr;

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	}

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	operator bool() const {

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		return value_.getTag() != JSON_NULL;

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	}

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	JsonValue value_;

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};

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// Easy-wrapper

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class JsonReader {

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public:

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	JsonReader(const std::string &filename);

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	// Makes a copy, after this returns you can free the input buffer. Zero termination is not necessary.

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	JsonReader(const char *data, size_t size) {

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		buffer_ = (char *)malloc(size + 1);

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		if (buffer_) {

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			memcpy(buffer_, data, size);

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			buffer_[size] = 0;

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			parse();

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		}

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	}

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	JsonReader(const JsonNode *node) {

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		ok_ = true;

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	}

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	~JsonReader() {

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		free(buffer_);

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	}

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	bool ok() const { return ok_; }

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	JsonGet root() { return root_.getTag() == JSON_OBJECT ? JsonGet(root_) : JsonGet(JSON_NULL); }

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	const JsonValue rootArray() const { return root_.getTag() == JSON_ARRAY ? root_ : JSON_NULL; }

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	const JsonValue rootValue() const { return root_; }

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private:

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	bool parse();

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	char *buffer_ = nullptr;

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	JsonAllocator alloc_;

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	JsonValue root_;

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	bool ok_ = false;

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	DISALLOW_COPY_AND_ASSIGN(JsonReader);

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};

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}  // namespace json

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