Initial commit

ArduinoJsonParser.h

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+/*
+ * malloc-free JSON parser for Arduino
+ * Benoit Blanchon 2014
+ * MIT License
+ */
+
+#ifndef __ARDUINOJSONPARSER_H
+#define __ARDUINOJSONPARSER_H
+
+#include <Arduino.h>
+#include "utility/jsmn.h"
+
+template <int N>
+class ArduinoJsonParser
+{
+public:
+
+	ArduinoJsonParser()
+	{
+		jsmn_init(&parser);
+	}
+
+	boolean parse(char* jsonString)
+	{
+		buffer = jsonString;
+
+		int tokenCount = sizeof(tokens) / sizeof(tokens[0]);
+
+		if (JSMN_SUCCESS != jsmn_parse(&parser, jsonString, tokens, tokenCount))
+			return false;
+
+		// Add null termination to each token
+		for (int i = 0; i < tokenCount; i++)
+		{
+			buffer[tokens[i].end] = 0;
+		}
+
+		return true;
+	}
+
+	char* getValue(char* name)
+	{
+		// Scan each keys, every two other token
+		// (skip index 0, because it's the whole json object)
+		for (int i = 1; i < 2 * N; i += 2)
+		{
+			// Early break if we reach the last token
+			if (i >= parser.toknext) break;
+
+			// Get key token string
+			char* key = buffer + tokens[i].start;
+
+			// Compare with desired name, ignoring case
+			if (strcasecmp(name, key) == 0)
+			{
+				return buffer + tokens[i + 1].start;
+			}
+		}
+	}
+
+private:
+
+	char* buffer;
+	jsmn_parser parser;
+	jsmntok_t tokens[N * 2 + 1];
+};
+
+#endif
+