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/*
* This file is part of Espruino, a JavaScript interpreter for Microcontrollers
*
* Copyright (C) 2013 Gordon Williams <[email protected]>
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* ----------------------------------------------------------------------------
* This file is designed to be parsed during the build process
*
* JavaScript JSON-handling Functions
* ----------------------------------------------------------------------------
*/
#include "jswrap_json.h"
#include "jsparse.h"
#include "jsinteractive.h"
#include "jswrapper.h"
/*JSON{ "type":"staticmethod",
"class" : "JSON", "name" : "stringify",
"description" : "Convert the given object into a JSON string which can subsequently be parsed with JSON.parse or eval",
"generate" : "jswrap_json_stringify",
"params" : [ [ "data", "JsVar", "The data to be converted to a JSON string"] ],
"return" : ["JsVar", "A JSON string"]
}*/
JsVar *jswrap_json_stringify(JsVar *v) {
JsVar *result = jsvNewFromEmptyString();
if (result) // could be out of memory
jsfGetJSON(v, result);
return result;
}
/*JSON{ "type":"staticmethod",
"class" : "JSON", "name" : "parse",
"description" : "Parse the given JSON string into a JavaScript object",
"generate" : "jswrap_json_parse",
"params" : [ [ "string", "JsVar", "A JSON string"] ],
"return" : ["JsVar", "The JavaScript object created by parsing the data string"]
}*/
JsVar *jswrap_json_parse(JsVar *v) {
JsVar *res = 0;
JsVar *bracketed = jsvNewFromString("(");
if (bracketed) { // could be out of memory
v = jsvAsString(v, true); // try and get this as a string
jsvAppendStringVarComplete(bracketed, v);
jsvAppendString(bracketed, ")");
res = jspEvaluateVar(jsiGetParser(), bracketed, 0);
jsvUnLock(bracketed);
}
return res;
}
/* This is like jsfGetJSONWithCallback, but handles ONLY functions (and does not print the initial 'function' text) */
void jsfGetJSONForFunctionWithCallback(JsVar *var, JsfGetJSONCallbackString callbackString, JsfGetJSONCallbackVar callbackVar, void *callbackData) {
assert(jsvIsFunction(var));
JsVarRef coderef = 0; // TODO: this should really be in jsvAsString
JsVarRef childref = var->firstChild;
bool firstParm = true;
callbackString(callbackData, "(");
while (childref) {
JsVar *child = jsvLock(childref);
childref = child->nextSibling;
if (jsvIsFunctionParameter(child)) {
if (firstParm)
firstParm=false;
else
callbackString(callbackData, ",");
callbackVar(callbackData, child); // FIXME: escape the string
} else if (jsvIsString(child) && jsvIsStringEqual(child, JSPARSE_FUNCTION_CODE_NAME)) {
coderef = child->firstChild;
}
jsvUnLock(child);
}
callbackString(callbackData, ") ");
if (coderef) {
JsVar *codeVar = jsvLock(coderef);
callbackVar(callbackData, codeVar);
jsvUnLock(codeVar);
} else callbackString(callbackData, "{}");
}
void jsfGetJSONWithCallback(JsVar *var, JsfGetJSONCallbackString callbackString, JsfGetJSONCallbackVar callbackVar, void *callbackData) {
if (jsvIsUndefined(var)) {
callbackString(callbackData, "undefined");
} else if (jsvIsArray(var)) {
int length = (int)jsvGetArrayLength(var);
int i;
callbackString(callbackData, "[");
for (i=0;i<length;i++) {
JsVar *item = jsvGetArrayItem(var, i);
jsfGetJSONWithCallback(item, callbackString, callbackVar, callbackData);
jsvUnLock(item);
if (i<length-1) callbackString(callbackData, ",");
}
callbackString(callbackData, "]");
} else if (jsvIsArrayBuffer(var)) {
callbackString(callbackData, "new ");
callbackString(callbackData, jswGetBasicObjectName(var));
callbackString(callbackData, "([");
callbackVar(callbackData, jsvAsString(var, false));
callbackString(callbackData, "])");
} else if (jsvIsObject(var)) {
bool first = true;
JsVarRef childref = var->firstChild;
callbackString(callbackData, "{");
while (childref) {
JsVar *child = jsvLock(childref);
bool hidden = jsvIsInternalObjectKey(child);
if (!hidden) {
if (first)
first = false;
else
callbackString(callbackData, ",");
callbackString(callbackData, "\"");
callbackVar(callbackData, child); // FIXME: escape the string
callbackString(callbackData, "\":");
}
JsVar *childVar = child->firstChild ? jsvLock(child->firstChild) : 0;
childref = child->nextSibling;
jsvUnLock(child);
if (!hidden) {
jsfGetJSONWithCallback(childVar, callbackString, callbackVar, callbackData);
}
jsvUnLock(childVar);
}
callbackString(callbackData, "}");
} else if (jsvIsFunction(var)) {
callbackString(callbackData, "function ");
jsfGetJSONForFunctionWithCallback(var, callbackString, callbackVar, callbackData);
} else if (jsvIsString(var) && !jsvIsName(var)) {
// escape the string
callbackString(callbackData, "\"");
JsvStringIterator it;
jsvStringIteratorNew(&it, var, 0);
while (jsvStringIteratorHasChar(&it)) {
char ch = jsvStringIteratorGetChar(&it);
callbackString(callbackData, escapeCharacter(ch));
jsvStringIteratorNext(&it);
}
jsvStringIteratorFree(&it);
callbackString(callbackData, "\"");
} else {
JsVar *str = jsvAsString(var, false);
if (str) {
callbackVar(callbackData, str);
jsvUnLock(str);
}
}
}
void jsfGetJSON(JsVar *var, JsVar *result) {
assert(jsvIsString(result));
jsfGetJSONWithCallback(var, (JsfGetJSONCallbackString)jsvAppendString, (JsfGetJSONCallbackVar)jsvAppendStringVarComplete, result);
}
void _jsfPrintJSON_str(void *data, const char *str) { NOT_USED(data); jsiConsolePrint(str); }
void _jsfPrintJSON_var(void *data, JsVar *var) { NOT_USED(data); jsiConsolePrintStringVar(var); }
void jsfPrintJSON(JsVar *var) {
jsfGetJSONWithCallback(var, _jsfPrintJSON_str, _jsfPrintJSON_var, 0);
}
void jsfPrintJSONForFunction(JsVar *var) {
jsfGetJSONForFunctionWithCallback(var, _jsfPrintJSON_str, _jsfPrintJSON_var, 0);
}
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