initial commit

Author: wyojustin

arduino/libraries/jsonlib.cpp

@@ -0,0 +1,85 @@
+#include "jsonlib.h"
+
+String jsonIndexList(String json, int idx){
+  int count = 1; // number of braces seen { = +1 } = -1
+  int i = 1;
+  int item_idx = 0;
+  int start = i;
+  int stop = json.length() - 1;
+  
+  while(i < json.length() && count > 0){
+    if(json.charAt(i) == ']' or json.charAt(i) == '}'){
+      count--;
+    }
+    if(json.charAt(i) == '{' or json.charAt(i) == '['){
+      count++;
+    }
+    if(count == 1 && json.charAt(i) == ',' && item_idx == idx){
+      //item separator!
+      stop = i;
+      return json.substring(start, stop);
+    }
+    if(count == 1 && json.charAt(i) == ']' && item_idx == idx){ 
+	stop = i + 1;
+	return json.substring(start, stop);
+    }
+    if(count == 1 && json.charAt(i) == ','){
+      item_idx++;
+      start = i + 1;
+    }
+    i++;
+  }
+  return json.substring(start, stop);
+}
+
+// return a sub-json struct
+String jsonExtract(String json, String name){
+  char next;
+  int start, stop;
+  
+  name = String("\"") + name + String("\"");
+  start = json.indexOf(name) + name.length() + 1;
+  next = json.charAt(start);
+  if(next == '\"'){
+    //Serial.println(".. a string");
+    start = start + 1;
+    stop = json.indexOf('"', start + 1);
+  }
+  else if(next == '['){
+    //Serial.println(".. a list");
+    int count = 1;
+    int i = start;
+    while(count > 0 && i++ < json.length()){
+      if(json.charAt(i) == ']'){
+	count--;
+      }
+      else if(json.charAt(i) == '['){
+	count++;
+      }
+    }
+    stop = i + 1;
+  }
+  else if(next == '{'){
+    //Serial.println(".. a struct");
+    int count = 1;
+    int i = start;
+    while(count > 0 && i++ < json.length()){
+      if(json.charAt(i) == '}'){
+	count--;
+      }
+      else if(json.charAt(i) == '{'){
+	count++;
+      }
+    }
+    stop = i + 1;
+  }
+  else if(next == '.' || next == '-' || ('0' <= next  && next <= '9')){
+    //Serial.println(".. a number");
+    int i = start;
+    while(i++ < json.length() && json.charAt(i) == '.' || ('0' <= json.charAt(i)  && json.charAt(i) <= '9')){
+    }
+    stop = i;
+  }
+  return json.substring(start, stop);
+}
+

arduino/libraries/jsonlib.h

@@ -0,0 +1,9 @@
+#ifndef JSONLIB_H
+#define JSONLIB_H
+
+#include <Arduino.h>
+
+String jsonIndexList(String json, int idx);
+String jsonExtract(String json, String name);
+
+#endif