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/*
* JsonDetail.h, part of VCMI engine
*
* Authors: listed in file AUTHORS in main folder
*
* License: GNU General Public License v2.0 or later
* Full text of license available in license.txt file, in main folder
*
*/
#pragma once
#include "JsonNode.h"
VCMI_LIB_NAMESPACE_BEGIN
class JsonWriter
{
//prefix for each line (tabulation)
std::string prefix;
std::ostream & out;
//sets whether compact nodes are written in single-line format
bool compact;
//tracks whether we are currently using single-line format
bool compactMode = false;
public:
template<typename Iterator>
void writeContainer(Iterator begin, Iterator end);
void writeEntry(JsonMap::const_iterator entry);
void writeEntry(JsonVector::const_iterator entry);
void writeString(const std::string & string);
void writeNode(const JsonNode & node);
JsonWriter(std::ostream & output, bool compact = false);
};
//Tiny string class that uses const char* as data for speed, members are private
//for ease of debugging and some compatibility with std::string
class constString
{
const char *data;
const size_t datasize;
public:
constString(const char * inputString, size_t stringSize):
data(inputString),
datasize(stringSize)
{
}
inline size_t size() const
{
return datasize;
};
inline const char& operator[] (size_t position)
{
assert (position < datasize);
return data[position];
}
};
//Internal class for string -> JsonNode conversion
class DLL_LINKAGE JsonParser
{
std::string errors; // Contains description of all encountered errors
constString input; // Input data
ui32 lineCount; // Currently parsed line, starting from 1
size_t lineStart; // Position of current line start
size_t pos; // Current position of parser
//Helpers
bool extractEscaping(std::string &str);
bool extractLiteral(const std::string &literal);
bool extractString(std::string &string);
bool extractWhitespace(bool verbose = true);
bool extractSeparator();
bool extractElement(JsonNode &node, char terminator);
//Methods for extracting JSON data
bool extractArray(JsonNode &node);
bool extractFalse(JsonNode &node);
bool extractFloat(JsonNode &node);
bool extractNull(JsonNode &node);
bool extractString(JsonNode &node);
bool extractStruct(JsonNode &node);
bool extractTrue(JsonNode &node);
bool extractValue(JsonNode &node);
//Add error\warning message to list
bool error(const std::string &message, bool warning=false);
public:
JsonParser(const char * inputString, size_t stringSize);
/// do actual parsing. filename is name of file that will printed to console if any errors were found
JsonNode parse(std::string fileName);
/// returns true if parsing was successful
bool isValid();
};
//Internal class for Json validation. Mostly compilant with json-schema v4 draft
namespace Validation
{
/// struct used to pass data around during validation
struct ValidationData
{
/// path from root node to current one.
/// JsonNode is used as variant - either string (name of node) or as float (index in list)
std::vector<JsonNode> currentPath;
/// Stack of used schemas. Last schema is the one used currently.
/// May contain multiple items in case if remote references were found
std::vector<std::string> usedSchemas;
/// generates error message
std::string makeErrorMessage(const std::string &message);
};
typedef std::function<std::string(const JsonNode &)> TFormatValidator;
typedef std::unordered_map<std::string, TFormatValidator> TFormatMap;
typedef std::function<std::string(ValidationData &, const JsonNode &, const JsonNode &, const JsonNode &)> TFieldValidator;
typedef std::unordered_map<std::string, TFieldValidator> TValidatorMap;
/// map of known fields in schema
const TValidatorMap & getKnownFieldsFor(JsonNode::JsonType type);
const TFormatMap & getKnownFormats();
std::string check(std::string schemaName, const JsonNode & data);
std::string check(std::string schemaName, const JsonNode & data, ValidationData & validator);
std::string check(const JsonNode & schema, const JsonNode & data, ValidationData & validator);
}
VCMI_LIB_NAMESPACE_END
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