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Unknown W. Brackets
082ddf5120
From the same author. Most importantly, reads numbers as doubles rather than as signed ints and floats. This allows us to actually read 32 bit unsigned int parameters. Moved all the native customization to a separate json_reader.cpp.
86 lines
2.3 KiB
C++
86 lines
2.3 KiB
C++
#include <string>
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#include <vector>
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#include "base/basictypes.h"
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#include "base/logging.h"
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#include "ext/gason/gason.h"
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struct JsonGet {
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JsonGet(const JsonValue &value) : value_(value) {
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}
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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 *getStringOrDie(const char *child_name) const;
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const char *getString(const char *child_name, const char *default_value) 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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JsonReader(const void *data, size_t size) {
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buffer_ = (char *)malloc(size + 1);
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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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JsonReader(const JsonNode *node) {
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ok_ = true;
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}
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~JsonReader() {
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if (buffer_)
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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 *error_pos;
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int status = jsonParse(buffer_, &error_pos, &root_, alloc_);
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if (status != JSON_OK) {
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ELOG("Error at (%i): %s\n%s\n\n", (int)(error_pos - buffer_), jsonStrError(status), error_pos);
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return false;
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}
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ok_ = true;
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return true;
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}
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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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