Text Classification
syfox
decision-engine
decision-making
decision-model
structured-prediction
system-one
si-substrate
intent-classification
routing
abstention
uncertainty-quantification
selective-prediction
hebbian
energy-based-model
associative-memory
no-transformer
no-neural-network
no-pattern-matching
moderation
spam-detection
multilingual
File size: 9,170 Bytes
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// SyFox — json.hpp
// Minimal dependency-free JSON parser/serializer (a TOOL, not core physics).
// Supports: null, bool, number, string (with escapes), array, object.
// C++17, deterministic, no exceptions on well-formed input (throws
// std::runtime_error with position on malformed input).
// ============================================================================
#pragma once
#include <cmath>
#include <cstdio>
#include <map>
#include <stdexcept>
#include <string>
#include <utility>
#include <vector>
namespace sfx {
struct JV;
using JVArr = std::vector<JV>;
using JVObj = std::map<std::string, JV>;
struct JV {
enum Type { NUL, BOOL, NUM, STR, ARR, OBJ };
Type t = NUL;
bool b = false;
double num = 0.0;
std::string str;
JVArr arr;
JVObj obj;
JV() = default;
JV(std::nullptr_t) : t(NUL) {}
JV(bool v) : t(BOOL), b(v) {}
JV(double v) : t(NUM), num(v) {}
JV(int v) : t(NUM), num(v) {}
JV(const char* v) : t(STR), str(v) {}
JV(std::string v) : t(STR), str(std::move(v)) {}
JV(JVArr v) : t(ARR), arr(std::move(v)) {}
JV(JVObj v) : t(OBJ), obj(std::move(v)) {}
bool is_null() const { return t == NUL; }
bool is_bool() const { return t == BOOL; }
bool is_num() const { return t == NUM; }
bool is_str() const { return t == STR; }
bool is_arr() const { return t == ARR; }
bool is_obj() const { return t == OBJ; }
bool has(const std::string& k) const { return t == OBJ && obj.count(k) != 0; }
const JV& at(const std::string& k) const {
if (t != OBJ || obj.count(k) == 0) { static const JV nil; return nil; }
return obj.at(k);
}
// tolerant string reader: numbers and bools stringify too
std::string as_str(const std::string& fallback = "") const {
switch (t) {
case STR: return str;
case NUM: { char buf[32]; std::snprintf(buf, sizeof(buf), "%.6g", num); return buf; }
case BOOL: return b ? "true" : "false";
default: return fallback;
}
}
double as_num(double fallback = 0.0) const { return t == NUM ? num : fallback; }
std::string dump() const {
std::string out;
dump_to(out);
return out;
}
static JV parse(const std::string& text) {
std::size_t i = 0;
JV v = parse_value(text, i);
skip_ws(text, i);
if (i != text.size()) throw std::runtime_error("JSON: trailing data at " + std::to_string(i));
return v;
}
private:
static void skip_ws(const std::string& s, std::size_t& i) {
while (i < s.size() && (s[i] == ' ' || s[i] == '\t' || s[i] == '\n' || s[i] == '\r')) ++i;
}
static char expect(const std::string& s, std::size_t& i, char c) {
if (i >= s.size() || s[i] != c)
throw std::runtime_error(std::string("JSON: expected '") + c + "' at " + std::to_string(i));
return s[i++];
}
static JV parse_value(const std::string& s, std::size_t& i) {
skip_ws(s, i);
if (i >= s.size()) throw std::runtime_error("JSON: unexpected end");
char c = s[i];
if (c == '{') return parse_obj(s, i);
if (c == '[') return parse_arr(s, i);
if (c == '"') return JV(parse_string(s, i));
if (c == 't') { literal(s, i, "true"); return JV(true); }
if (c == 'f') { literal(s, i, "false"); return JV(false); }
if (c == 'n') { literal(s, i, "null"); return JV(nullptr); }
return parse_num(s, i);
}
static void literal(const std::string& s, std::size_t& i, const char* lit) {
for (const char* p = lit; *p; ++p, ++i)
if (i >= s.size() || s[i] != *p)
throw std::runtime_error("JSON: bad literal at " + std::to_string(i));
}
static JV parse_num(const std::string& s, std::size_t& i) {
std::size_t start = i;
if (i < s.size() && (s[i] == '-' || s[i] == '+')) ++i;
bool digits = false;
while (i < s.size() && ((s[i] >= '0' && s[i] <= '9') || s[i] == '.' || s[i] == 'e' ||
s[i] == 'E' || s[i] == '-' || s[i] == '+')) {
if (s[i] >= '0' && s[i] <= '9') digits = true;
++i;
}
if (!digits) throw std::runtime_error("JSON: bad number at " + std::to_string(start));
return JV(std::stod(s.substr(start, i - start)));
}
static std::string parse_string(const std::string& s, std::size_t& i) {
expect(s, i, '"');
std::string out;
while (i < s.size()) {
char c = s[i++];
if (c == '"') return out;
if (c == '\\') {
if (i >= s.size()) break;
char e = s[i++];
switch (e) {
case '"': out += '"'; break;
case '\\': out += '\\'; break;
case '/': out += '/'; break;
case 'b': out += '\b'; break;
case 'f': out += '\f'; break;
case 'n': out += '\n'; break;
case 'r': out += '\r'; break;
case 't': out += '\t'; break;
case 'u': { // \uXXXX (BMP)
if (i + 4 > s.size()) throw std::runtime_error("JSON: bad \\u escape");
unsigned cp = std::stoul(s.substr(i, 4), nullptr, 16);
i += 4;
if (cp < 0x80) out += static_cast<char>(cp);
else if (cp < 0x800) {
out += static_cast<char>(0xC0 | (cp >> 6));
out += static_cast<char>(0x80 | (cp & 0x3F));
} else {
out += static_cast<char>(0xE0 | (cp >> 12));
out += static_cast<char>(0x80 | ((cp >> 6) & 0x3F));
out += static_cast<char>(0x80 | (cp & 0x3F));
}
break;
}
default: throw std::runtime_error("JSON: bad escape at " + std::to_string(i));
}
} else out += c;
}
throw std::runtime_error("JSON: unterminated string");
}
static JV parse_arr(const std::string& s, std::size_t& i) {
expect(s, i, '[');
JVArr arr;
skip_ws(s, i);
if (i < s.size() && s[i] == ']') { ++i; return JV(std::move(arr)); }
while (true) {
arr.push_back(parse_value(s, i));
skip_ws(s, i);
if (i < s.size() && s[i] == ',') { ++i; continue; }
expect(s, i, ']');
break;
}
return JV(std::move(arr));
}
static JV parse_obj(const std::string& s, std::size_t& i) {
expect(s, i, '{');
JVObj obj;
skip_ws(s, i);
if (i < s.size() && s[i] == '}') { ++i; return JV(std::move(obj)); }
while (true) {
skip_ws(s, i);
std::string key = parse_string(s, i);
skip_ws(s, i);
expect(s, i, ':');
obj[key] = parse_value(s, i);
skip_ws(s, i);
if (i < s.size() && s[i] == ',') { ++i; continue; }
expect(s, i, '}');
break;
}
return JV(std::move(obj));
}
static void dump_str(const std::string& v, std::string& out) {
out += '"';
for (unsigned char c : v) {
switch (c) {
case '"': out += "\\\""; break;
case '\\': out += "\\\\"; break;
case '\n': out += "\\n"; break;
case '\r': out += "\\r"; break;
case '\t': out += "\\t"; break;
default:
if (c < 0x20) { char buf[8]; std::snprintf(buf, sizeof(buf), "\\u%04x", c); out += buf; }
else out += static_cast<char>(c);
}
}
out += '"';
}
void dump_to(std::string& out) const {
switch (t) {
case NUL: out += "null"; break;
case BOOL: out += b ? "true" : "false"; break;
case NUM: {
if (std::isfinite(num)) {
char buf[32]; std::snprintf(buf, sizeof(buf), "%.6g", num); out += buf;
} else out += "null";
break;
}
case STR: dump_str(str, out); break;
case ARR: {
out += '[';
for (std::size_t i = 0; i < arr.size(); ++i) { if (i) out += ','; arr[i].dump_to(out); }
out += ']';
break;
}
case OBJ: {
out += '{';
bool first = true;
for (const auto& kv : obj) {
if (!first) out += ',';
first = false;
dump_str(kv.first, out);
out += ':';
kv.second.dump_to(out);
}
out += '}';
break;
}
}
}
};
} // namespace sfx
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