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/*
* Javascript implementation for the Jansson JSON parser.
* Source: https://github.com/akheron/jansson
*
* Implemented and tested with:
* https://github.com/akheron/jansson/commit/cf1074e70ea42a1dea4d6e57b2b29532049bcd28
*/
var LibraryJansson = {
$JANSSON: {
load: function(string, flags, error) {
var json_obj = eval('(' + string + ')');
if (json_obj != null) {
// Create the root node with the nodeID `1`
g_json_context = [null, {"name" : "root", "node" : json_obj}];
return 1;
} else {
g_json_context = null;
return null;
}
},
type: function(nodeID) {
if (!g_json_context)
return null;
var node = g_json_context[nodeID].node;
if (typeof(node) === 'object' && (node instanceof Array))
return 'array'
else
return typeof(node);
},
getNode: function(parentNodeID) {
if (!g_json_context)
return null;
var parentNode = g_json_context[parentNodeID];
if (!parentNode) {
console.log("Jansson: Node with ID `" + parentNodeID + "` not found.");
return null;
}
// Add all child nodes of the parent node to the context.
// Consequently we can access these child nodes with an ID (pointer)
// TODO: Here is room for performance improvements
if (!parentNode.begin) {
var childNodeID = g_json_context.length;
for(var childNode in parentNode.node) {
var childNodeID = g_json_context.length;
g_json_context[childNodeID] = {"name" : childNode, "node" : parentNode.node[childNode]};
if (!parentNode.begin) parentNode.begin = childNodeID;
};
parentNode.end = childNodeID;
}
return parentNode;
}
},
json_loads: function(string, flags, error) {
return JANSSON.load(Pointer_stringify(string), flags, error);
},
json_loadb: function(buffer, buflen, flags, error) {
return JANSSON.load(Pointer_stringify(buffer).substr(0, buflen), flags, error);
},
json_is_object: function(nodeID) {
return (JANSSON.type(nodeID) === 'object');
},
json_is_array: function(nodeID) {
return (JANSSON.type(nodeID) === 'array');
},
json_is_string: function(nodeID) {
return (JANSSON.type(nodeID) === 'string');
},
json_is_integer: function(nodeID) {
return (JANSSON.type(nodeID) === 'number');
},
json_is_real: function(nodeID) {
return (JANSSON.type(nodeID) === 'number');
},
json_is_number: function(nodeID) {
return (JANSSON.type(nodeID) === 'number');
},
json_is_null: function(nodeID) {
var nodeType = JANSSON.type(nodeID);
return (nodeType === 'undefined' || nodeType === 'null');
},
json_object_get: function(parentNodeID, key) {
var key = Pointer_stringify(key);
var parentNode = JANSSON.getNode(parentNodeID);
if (!parentNode)
return null;
// Find the ID (pointer) of the requested child node
for (var i=parentNode.begin; i<=parentNode.end; i++) {
if (g_json_context[i].name == key) return i;
}
return null;
},
json_object_iter: function(parentNodeID) {
var parentNode = JANSSON.getNode(parentNodeID);
if (!parentNode)
return null;
return parentNode.begin;
},
json_object_iter_next: function(parentNodeID, childNodeID) {
var parentNode = JANSSON.getNode(parentNodeID);
if (!parentNode)
return null;
if (childNodeID < parentNode.begin || childNodeID >= parentNode.end)
return null;
else
return childNodeID+1;
},
json_array_size: function(parentNodeID, index) {
var parentNode = JANSSON.getNode(parentNodeID);
if (!parentNode)
return 0;
var size = parentNode.end - parentNode.begin + 1;
if (size < 0)
size = 0;
return size;
},
json_array_get: function(parentNodeID, index) {
var parentNode = JANSSON.getNode(parentNodeID);
var position = parentNode.begin + index;
if (position < parentNode.begin || position > parentNode.end)
return null;
else
return position;
},
json_object_iter_key: function(nodeID) {
var node = g_json_context[nodeID];
if (!node)
return null;
return allocate(intArrayFromString(node.name), 'i8', ALLOC_NORMAL);
},
json_object_iter_value: function(nodeID) {
return nodeID;
},
json_string_value: function(nodeID) {
var node = g_json_context[nodeID];
if (!node)
return null;
return allocate(intArrayFromString(node.node), 'i8', ALLOC_NORMAL);
},
json_integer_value: function(nodeID) {
var node = g_json_context[nodeID];
if (!node)
return null;
// Convert JSON number to an integer
// c.f. http://stackoverflow.com/questions/596467/how-do-i-convert-a-float-to-an-int-in-javascript
if (node.node<0)
return Math.ceil(node.node);
else
return Math.floor(node.node);
},
json_real_value: function(nodeID) {
var node = g_json_context[nodeID];
if (!node)
return null;
return node.node;
},
json_number_value: function(nodeID) {
var node = g_json_context[nodeID];
if (!node)
return null;
return node.node;
},
json_delete: function(nodeID) {
// We assume, if the root node's reference count is decreased, we can forget the context.
if (nodeID == 1)
g_json_context = null;
}
};
autoAddDeps(LibraryJansson, '$JANSSON');
mergeInto(LibraryManager.library, LibraryJansson);
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