Added json parser
This commit is contained in:
MihailRis
parent
a1dafa22bd
commit
6b5b0a9347
639
src/coders/json.cpp
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639
src/coders/json.cpp
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@ -0,0 +1,639 @@
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#include "json.h"
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#include <math.h>
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#include <sstream>
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#include <memory>
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using namespace json;
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using std::string;
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using std::vector;
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using std::unique_ptr;
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using std::unordered_map;
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using std::stringstream;
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using std::make_pair;
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inline bool is_digit(int c) {
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return (c >= '0' && c <= '9');
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}
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inline bool is_whitespace(int c) {
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return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == '\f';
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}
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inline bool is_identifier_start(int c) {
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return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || c == '_' || c == '-' || c == '.';
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}
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inline bool is_identifier_part(int c) {
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return is_identifier_start(c) || is_digit(c);
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}
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inline int is_box(int c) {
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switch (c) {
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case 'B':
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case 'b':
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return 2;
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case 'O':
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case 'o':
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return 8;
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case 'X':
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case 'x':
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return 16;
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}
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return 10;
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}
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inline int char2int(int c) {
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if (c >= '0' && c <= '9') {
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return c - '0';
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}
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if (c >= 'a' && c <= 'f') {
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return 10 + c - 'a';
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}
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if (c >= 'A' && c <= 'F') {
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return 10 + c - 'A';
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}
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return -1;
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}
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inline number_t power(number_t base, int64_t power) {
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number_t result = 1.0;
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for (int64_t i = 0; i < power; i++) {
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result *= base;
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}
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return result;
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}
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string json::escape(string s) {
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std::stringstream ss;
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ss << '"';
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for (char c : s) {
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switch (c) {
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case '\n': ss << "\\n"; break;
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case '\r': ss << "\\r"; break;
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case '\t': ss << "\\t"; break;
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case '\f': ss << "\\f"; break;
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case '\b': ss << "\\b"; break;
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case '"': ss << "\\\""; break;
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case '\\': ss << "\\\\"; break;
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default:
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if (c < ' ') {
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ss << "\\" << std::oct << (int)c;
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break;
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}
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ss << c;
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break;
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}
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}
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ss << '"';
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return ss.str();
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}
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inline void newline(std::stringstream& ss, bool nice, uint indent, const std::string indentstr) {
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if (nice) {
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ss << "\n";
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for (uint i = 0; i < indent; i++) {
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ss << indentstr;
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}
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} else {
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ss << ' ';
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}
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}
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void stringify(Value* value, stringstream& ss, int indent, string indentstr, bool nice);
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void stringifyObj(JObject* obj, stringstream& ss, int indent, string indentstr, bool nice);
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void stringify(Value* value, stringstream& ss, int indent, string indentstr, bool nice) {
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if (value->type == valtype::object) {
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stringifyObj(value->value.obj, ss, indent, indentstr, nice);
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}
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else if (value->type == valtype::array) {
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vector<Value*>& list = value->value.arr->values;
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if (list.empty()) {
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ss << "[]";
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return;
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}
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ss << '[';
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for (uint i = 0; i < list.size(); i++) {
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Value* value = list[i];
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if (i > 0 || nice) {
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newline(ss, nice, indent, indentstr);
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}
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stringify(value, ss, indent+1, indentstr, nice);
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if (i + 1 < list.size()) {
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ss << ',';
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}
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}
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if (nice) {
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newline(ss, true, indent - 1, indentstr);
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}
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ss << ']';
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} else if (value->type == valtype::boolean) {
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ss << (value->value.boolean ? "true" : "false");
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} else if (value->type == valtype::number) {
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ss << value->value.num;
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} else if (value->type == valtype::string) {
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ss << escape(*value->value.str);
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}
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}
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void stringifyObj(JObject* obj, stringstream& ss, int indent, string indentstr, bool nice) {
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if (obj->map.empty()) {
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ss << "{}";
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return;
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}
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ss << "{";
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uint index = 0;
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for (auto entry : obj->map) {
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const std::string& key = entry.first;
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if (index > 0 || nice) {
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newline(ss, nice, indent, indentstr);
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}
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Value* value = entry.second;
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ss << escape(key) << ": ";
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stringify(value, ss, indent+1, indentstr, nice);
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index++;
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if (index < obj->map.size()) {
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ss << ',';
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}
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}
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if (nice) {
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newline(ss, true, indent-1, indentstr);
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}
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ss << '}';
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}
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string json::stringify(JObject* obj, bool nice, string indent) {
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stringstream ss;
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stringifyObj(obj, ss, 1, indent, nice);
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return ss.str();
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}
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parsing_error::parsing_error(string message,
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string filename,
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string source,
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uint pos,
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uint line,
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uint linestart)
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: std::runtime_error(message), filename(filename), source(source),
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pos(pos), line(line), linestart(linestart) {
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}
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string parsing_error::errorLog() const {
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std::stringstream ss;
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uint linepos = pos - linestart;
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ss << "parsing error in file '" << filename;
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ss << "' at " << (line+1) << ":" << linepos << ": " << this->what() << "\n";
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size_t end = source.find("\n", linestart);
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if (end == string::npos) {
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end = source.length();
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}
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ss << source.substr(linestart, end-linestart) << "\n";
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for (uint i = 0; i < linepos; i++) {
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ss << " ";
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}
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ss << "^";
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return ss.str();
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}
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JArray::~JArray() {
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for (auto value : values) {
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delete value;
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}
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}
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std::string JArray::str(size_t index) const {
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return *values[index]->value.str;
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}
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number_t JArray::num(size_t index) const {
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return values[index]->value.num;
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}
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JObject* JArray::obj(size_t index) const {
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return values[index]->value.obj;
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}
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JArray* JArray::arr(size_t index) const {
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return values[index]->value.arr;
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}
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bool JArray::flag(size_t index) const {
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return values[index]->value.boolean;
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}
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JArray& JArray::put(string value) {
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valvalue val;
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val.str = new string(value);
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values.push_back(new Value(valtype::string, val));
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return *this;
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}
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JArray& JArray::put(number_t value) {
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valvalue val;
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val.num = value;
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values.push_back(new Value(valtype::number, val));
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return *this;
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}
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JArray& JArray::put(bool value) {
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valvalue val;
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val.boolean = value;
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values.push_back(new Value(valtype::boolean, val));
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return *this;
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}
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JArray& JArray::put(JObject* value) {
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valvalue val;
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val.obj = value;
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values.push_back(new Value(valtype::object, val));
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return *this;
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}
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JArray& JArray::put(JArray* value) {
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valvalue val;
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val.arr = value;
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values.push_back(new Value(valtype::array, val));
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return *this;
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}
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JObject::~JObject() {
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for (auto entry : map) {
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delete entry.second;
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}
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}
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std::string JObject::str(std::string key, std::string def) const {
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auto found = map.find(key);
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if (found != map.end())
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return *found->second->value.str;
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return def;
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}
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number_t JObject::num(std::string key, number_t def) const {
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auto found = map.find(key);
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if (found != map.end())
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return found->second->value.num;
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return def;
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}
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JObject* JObject::obj(std::string key) const {
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auto found = map.find(key);
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if (found != map.end())
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return found->second->value.obj;
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return nullptr;
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}
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JArray* JObject::arr(std::string key) const {
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auto found = map.find(key);
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if (found != map.end())
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return found->second->value.arr;
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return nullptr;
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}
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bool JObject::flag(std::string key, bool def) const {
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auto found = map.find(key);
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if (found != map.end())
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return found->second->value.boolean;
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return def;
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}
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JObject& JObject::put(string key, number_t value) {
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auto found = map.find(key);
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if (found != map.end()) delete found->second;
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valvalue val;
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val.num = value;
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map.insert(make_pair(key, new Value(valtype::number, val)));
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return *this;
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}
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JObject& JObject::put(string key, string value){
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auto found = map.find(key);
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if (found != map.end()) delete found->second;
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valvalue val;
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val.str = new string(value);
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map.insert(make_pair(key, new Value(valtype::string, val)));
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return *this;
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}
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JObject& JObject::put(string key, JObject* value){
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auto found = map.find(key);
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if (found != map.end()) delete found->second;
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valvalue val;
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val.obj = value;
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map.insert(make_pair(key, new Value(valtype::object, val)));
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return *this;
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}
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JObject& JObject::put(string key, JArray* value){
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auto found = map.find(key);
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if (found != map.end()) delete found->second;
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valvalue val;
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val.arr = value;
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map.insert(make_pair(key, new Value(valtype::array, val)));
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return *this;
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}
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JObject& JObject::put(string key, bool value){
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auto found = map.find(key);
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if (found != map.end()) delete found->second;
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valvalue val;
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val.boolean = value;
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map.insert(make_pair(key, new Value(valtype::boolean, val)));
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return *this;
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}
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Value::Value(valtype type, valvalue value) : type(type), value(value) {
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}
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Value::~Value() {
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switch (type) {
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case valtype::object: delete value.obj; break;
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case valtype::array: delete value.arr; break;
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case valtype::string: delete value.str; break;
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default:
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break;
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}
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}
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Parser::Parser(string filename, string source) : filename(filename), source(source) {
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}
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JObject* Parser::parse() {
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char next = peek();
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if (next != '{') {
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throw error("'{' expected");
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}
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return parseObject();
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}
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bool Parser::hasNext() {
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return pos < source.length();
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}
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char Parser::nextChar() {
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if (!hasNext()) {
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throw error("unexpected end");
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}
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return source[pos++];
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}
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void Parser::expect(char expected) {
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char c = peek();
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if (c != expected) {
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throw error("'"+string({expected})+"' expected");
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}
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pos++;
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}
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char Parser::peek() {
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skipWhitespace();
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if (pos >= source.length()) {
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throw error("unexpected end");
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}
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return source[pos];
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}
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parsing_error Parser::error(std::string message) {
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return parsing_error(message, filename, source, pos, line, linestart);
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}
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void Parser::skipWhitespace() {
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while (hasNext()) {
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char next = source[pos];
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if (next == '\n') {
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line++;
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linestart = ++pos;
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continue;
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}
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if (is_whitespace(next)) {
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pos++;
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} else {
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break;
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}
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}
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}
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string Parser::parseName() {
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char c = peek();
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if (!is_identifier_start(c)) {
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if (c == '"') {
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pos++;
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return parseString(c);
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}
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throw error("identifier expected");
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}
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int start = pos;
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while (hasNext() && is_identifier_part(source[pos])) {
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pos++;
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}
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return source.substr(start, pos-start);
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}
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int64_t Parser::parseSimpleInt(int base) {
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char c = peek();
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int index = char2int(c);
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if (index == -1 || index >= base) {
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throw error("invalid number literal");
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}
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int64_t value = index;
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pos++;
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while (hasNext()) {
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c = source[pos];
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while (c == '_') {
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c = source[++pos];
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}
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index = char2int(c);
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if (index == -1 || index >= base) {
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return value;
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}
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value *= base;
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value += index;
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pos++;
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}
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return value;
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}
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number_t Parser::parseNumber(int sign) {
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char c = peek();
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int base = 10;
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if (c == '0' && pos + 1 < source.length() &&
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(base = is_box(source[pos+1])) != 10) {
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pos += 2;
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return parseSimpleInt(base);
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}
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int64_t value = parseSimpleInt(base);
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if (!hasNext()) {
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return value * sign;
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}
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c = source[pos];
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if (c == 'e' || c == 'E') {
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pos++;
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int s = 1;
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if (peek() == '-') {
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s = -1;
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pos++;
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} else if (peek() == '+'){
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pos++;
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}
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return sign * value * power(10.0, s * parseSimpleInt(10));
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}
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if (c == '.') {
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pos++;
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int64_t expo = 1;
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while (hasNext() && source[pos] == '0') {
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expo *= 10;
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pos++;
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}
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int64_t afterdot = 0;
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if (hasNext() && is_digit(source[pos])) {
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afterdot = parseSimpleInt(10);
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}
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expo *= power(10, fmax(0, log10(afterdot) + 1));
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c = source[pos];
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number_t dvalue = (value + (afterdot / (number_t)expo));
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if (c == 'e' || c == 'E') {
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pos++;
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int s = 1;
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if (peek() == '-') {
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s = -1;
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pos++;
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} else if (peek() == '+'){
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pos++;
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}
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return sign * dvalue * power(10.0, s * parseSimpleInt(10));
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}
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return dvalue;
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}
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return value;
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}
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string Parser::parseString(char quote) {
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std::stringstream ss;
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while (hasNext()) {
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char c = source[pos];
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if (c == quote) {
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pos++;
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return ss.str();
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}
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if (c == '\\') {
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pos++;
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c = nextChar();
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if (c >= '0' && c <= '7') {
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pos--;
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ss << (char)parseSimpleInt(8);
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continue;
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}
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switch (c) {
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case 'n': ss << '\n'; break;
|
||||
case 'r': ss << '\r'; break;
|
||||
case 'b': ss << '\b'; break;
|
||||
case 't': ss << '\t'; break;
|
||||
case 'f': ss << '\f'; break;
|
||||
case '\'': ss << '\\'; break;
|
||||
case '"': ss << '"'; break;
|
||||
case '\\': ss << '\\'; break;
|
||||
case '/': ss << '/'; break;
|
||||
case '\n': pos++; continue;
|
||||
default:
|
||||
throw error("'\\" + string({c}) + "' is an illegal escape");
|
||||
}
|
||||
continue;
|
||||
}
|
||||
if (c == '\n') {
|
||||
throw error("non-closed string literal");
|
||||
}
|
||||
ss << c;
|
||||
pos++;
|
||||
}
|
||||
throw error("unexpected end");
|
||||
}
|
||||
|
||||
JObject* Parser::parseObject() {
|
||||
expect('{');
|
||||
unique_ptr<JObject> obj(new JObject());
|
||||
unordered_map<string, Value*>& map = obj->map;
|
||||
while (peek() != '}') {
|
||||
string key = parseName();
|
||||
char next = peek();
|
||||
if (next != ':') {
|
||||
throw error("':' expected");
|
||||
}
|
||||
pos++;
|
||||
map.insert(make_pair(key, parseValue()));
|
||||
next = peek();
|
||||
if (next == ',') {
|
||||
pos++;
|
||||
} else if (next == '}') {
|
||||
break;
|
||||
} else {
|
||||
throw error("',' expected");
|
||||
}
|
||||
}
|
||||
pos++;
|
||||
return obj.release();
|
||||
}
|
||||
|
||||
JArray* Parser::parseArray() {
|
||||
expect('[');
|
||||
unique_ptr<JArray> arr(new JArray());
|
||||
vector<Value*>& values = arr->values;
|
||||
while (peek() != ']') {
|
||||
values.push_back(parseValue());
|
||||
|
||||
char next = peek();
|
||||
if (next == ',') {
|
||||
pos++;
|
||||
} else if (next == ']') {
|
||||
break;
|
||||
} else {
|
||||
throw error("',' expected");
|
||||
}
|
||||
}
|
||||
pos++;
|
||||
return arr.release();
|
||||
}
|
||||
|
||||
Value* Parser::parseValue() {
|
||||
char next = peek();
|
||||
valvalue val;
|
||||
if (is_identifier_start(next)) {
|
||||
string literal = parseName();
|
||||
if (literal == "true") {
|
||||
val.boolean = true;
|
||||
return new Value(valtype::boolean, val);
|
||||
}
|
||||
if (literal == "false") {
|
||||
val.boolean = false;
|
||||
return new Value(valtype::boolean, val);
|
||||
}
|
||||
throw error("invalid literal");
|
||||
}
|
||||
if (next == '{') {
|
||||
val.obj = parseObject();
|
||||
return new Value(valtype::object, val);
|
||||
}
|
||||
if (next == '[') {
|
||||
val.arr = parseArray();
|
||||
return new Value(valtype::array, val);
|
||||
}
|
||||
if (next == '-' || next == '+') {
|
||||
pos++;
|
||||
val.num = parseNumber(next == '-' ? -1 : 1);
|
||||
return new Value(valtype::number, val);
|
||||
}
|
||||
if (is_digit(next)) {
|
||||
val.num = parseNumber(1);
|
||||
return new Value(valtype::number, val);
|
||||
}
|
||||
if (next == '"' || next == '\'') {
|
||||
pos++;
|
||||
val.str = new string(parseString(next));
|
||||
return new Value(valtype::string, val);
|
||||
}
|
||||
throw error("unexpected character '"+string({next})+"'");
|
||||
}
|
||||
129
src/coders/json.h
Normal file
129
src/coders/json.h
Normal file
@ -0,0 +1,129 @@
|
||||
#ifndef CODERS_JSON_H_
|
||||
#define CODERS_JSON_H_
|
||||
|
||||
#include <vector>
|
||||
#include <string>
|
||||
#include <stdint.h>
|
||||
#include <stdexcept>
|
||||
#include <unordered_map>
|
||||
|
||||
typedef unsigned int uint;
|
||||
|
||||
namespace json {
|
||||
typedef double number_t;
|
||||
class JObject;
|
||||
class JArray;
|
||||
class Value;
|
||||
|
||||
extern std::string escape(std::string s);
|
||||
extern std::string stringify(JObject* obj, bool nice, std::string indent);
|
||||
class parsing_error : public std::runtime_error {
|
||||
public:
|
||||
std::string filename;
|
||||
std::string source;
|
||||
uint pos;
|
||||
uint line;
|
||||
uint linestart;
|
||||
|
||||
parsing_error(std::string message,
|
||||
std::string filename,
|
||||
std::string source,
|
||||
uint pos,
|
||||
uint line,
|
||||
uint linestart);
|
||||
|
||||
std::string errorLog() const;
|
||||
};
|
||||
|
||||
enum class valtype {
|
||||
object, array, number, string, boolean
|
||||
};
|
||||
|
||||
union valvalue {
|
||||
JObject* obj;
|
||||
JArray* arr;
|
||||
std::string* str;
|
||||
number_t num;
|
||||
bool boolean;
|
||||
};
|
||||
|
||||
class Value {
|
||||
public:
|
||||
valtype type;
|
||||
valvalue value;
|
||||
Value(valtype type, valvalue value);
|
||||
~Value();
|
||||
};
|
||||
|
||||
class JArray {
|
||||
public:
|
||||
std::vector<Value*> values;
|
||||
~JArray();
|
||||
|
||||
std::string str(size_t index) const;
|
||||
number_t num(size_t index) const;
|
||||
JObject* obj(size_t index) const;
|
||||
JArray* arr(size_t index) const;
|
||||
bool flag(size_t index) const;
|
||||
|
||||
inline size_t size() const {
|
||||
return values.size();
|
||||
}
|
||||
|
||||
JArray& put(number_t value);
|
||||
JArray& put(std::string value);
|
||||
JArray& put(JObject* value);
|
||||
JArray& put(JArray* value);
|
||||
JArray& put(bool value);
|
||||
};
|
||||
|
||||
class JObject {
|
||||
public:
|
||||
std::unordered_map<std::string, Value*> map;
|
||||
~JObject();
|
||||
|
||||
std::string str(std::string key, std::string def) const;
|
||||
number_t num(std::string key, number_t def) const;
|
||||
JObject* obj(std::string key) const;
|
||||
JArray* arr(std::string key) const;
|
||||
bool flag(std::string key, bool def) const;
|
||||
|
||||
JObject& put(std::string key, number_t value);
|
||||
JObject& put(std::string key, std::string value);
|
||||
JObject& put(std::string key, JObject* value);
|
||||
JObject& put(std::string key, JArray* value);
|
||||
JObject& put(std::string key, bool value);
|
||||
};
|
||||
|
||||
class Parser {
|
||||
std::string filename;
|
||||
std::string source;
|
||||
uint pos = 0;
|
||||
uint line = 0;
|
||||
uint linestart = 0;
|
||||
|
||||
void skipWhitespace();
|
||||
void expect(char expected);
|
||||
char peek();
|
||||
char nextChar();
|
||||
bool hasNext();
|
||||
|
||||
std::string parseName();
|
||||
int64_t parseSimpleInt(int base);
|
||||
number_t parseNumber(int sign);
|
||||
std::string parseString(char chr);
|
||||
|
||||
JArray* parseArray();
|
||||
JObject* parseObject();
|
||||
Value* parseValue();
|
||||
|
||||
parsing_error error(std::string message);
|
||||
|
||||
public:
|
||||
Parser(std::string filename, std::string source);
|
||||
|
||||
JObject* parse();
|
||||
};
|
||||
}
|
||||
|
||||
#endif // CODERS_JSON_H_
|
||||
Loading…
x
Reference in New Issue
Block a user