copy from an old project

src/json.cpp

@@ -0,0 +1,111 @@
+#include <json.hpp>
+
+static constexpr size_t BUF_SIZE = 64 + 1;
+char _buf[BUF_SIZE];
+size_t _idx;
+size_t _indent;
+
+JsonParser::HandlerBase* _handlers;
+
+JsonParser::HandlerBase::HandlerBase()
+{
+    _next     = _handlers;
+    _handlers = this;
+}
+
+int JsonParser::json_printer(const char* bytes, size_t len, void* data)
+{
+    // info("[[%d]]\n", len);
+    // for (size_t i = 0; i < len; i++)
+    // {
+    //     info("%c", bytes[i]);
+    // }
+    // return 0;
+
+    for (size_t i = 0; i < len; i++)
+    {
+        bool nl = true;
+        if (bytes[i] == '}' || bytes[i] == ']')
+        {
+            nl = false;
+            _indent--;
+            info("\n");
+            for (size_t i = 0; i < _indent; i++)
+            {
+                info("  ");
+            }
+        }
+        info("%c", bytes[i]);
+        if (bytes[i] == '{' || bytes[i] == '[')
+        {
+            _indent++;
+        }
+        if (nl
+            && (bytes[i] == ',' || bytes[i] == '{' || bytes[i] == '}'
+                || bytes[i] == '[' || bytes[i] == ']'))
+        {
+            info("\n");
+            for (size_t i = 0; i < _indent; i++)
+            {
+                info("  ");
+            }
+        }
+    }
+    return 0;
+}
+
+void commit()
+{
+    _buf[_idx] = '\0';
+    bool ok                    = false;
+    JsonParser::HandlerBase* h = _handlers;
+    while (h)
+    {
+        if (h->handle(_buf, _idx))
+        {
+            ok = true;
+            break;
+        }
+        h = h->_next;
+    };
+    _idx = 0;
+    if (!ok)
+    {
+        info("parse end error\n");
+    }
+}
+
+void flush_error()
+{
+    _idx = 0;
+    error("input buffer overflow, flushing\n");
+}
+
+void JsonParser::init()
+{
+    /* nothing to do */
+}
+
+void JsonParser::add_text(uint8_t* buf, size_t size)
+{
+    for (size_t i = 0; i < size; i++)
+    {
+        if (buf[i] == ' ' || buf[i] == '\r' || buf[i] == '\n')
+        {
+            continue;
+        }
+        if (buf[i] == '}')
+        {
+            _buf[_idx] = buf[i];
+            _idx++;
+            commit();
+            continue;
+        }
+        _buf[_idx] = buf[i];
+        _idx++;
+        if (_idx >= BUF_SIZE)
+        {
+            flush_error();
+        }
+    }
+}