src/main.cpp

   1 /*
   2  * TinyJS
   3  *
   4  * A single-file Javascript-alike engine
   5  *
   6  * Authored By Gordon Williams <gw@pur3.co.uk>
   7  *
   8  * Copyright (C) 2009 Pur3 Ltd
   9  *
  10  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  11  * this software and associated documentation files (the "Software"), to deal in
  12  * the Software without restriction, including without limitation the rights to
  13  * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
  14  * of the Software, and to permit persons to whom the Software is furnished to do
  15  * so, subject to the following conditions:
  16
  17  * The above copyright notice and this permission notice shall be included in all
  18  * copies or substantial portions of the Software.
  19
  20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  23  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  24  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  25  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  26  * SOFTWARE.
  27  */
  28
  29 /*
  30  * This is a simple program showing how to use TinyJS
  31  */
  32
  33 #include <assert.h>
  34 #include <stdio.h>
  35 #include "tinyjs.h"
  36
  37 const char *code =
  38     "function myfunc(x, y)"
  39     "{"
  40         "return x + y;"
  41     "}"
  42     "var a = myfunc(1,2);"
  43     "print(a);"
  44 ;
  45
  46 void js_print(TinyJS::Variable *v, void *userdata)
  47 {
  48     (void)userdata;
  49     printf("> %s\n", v->getParameter("text")->getString().c_str());
  50 }
  51
  52 void js_dump(TinyJS::Variable *v, void *userdata)
  53 {
  54     (void)v;
  55     auto js = (TinyJS::Interpreter*)userdata;
  56     js->getRoot()->trace(">  ");
  57 }
  58
  59 void js_lexer(TinyJS::Variable* v, void* userdata)
  60 {
  61
  62 }
  63
  64
  65 int main(int argc, char **argv)
  66 {
  67     (void)argc;
  68     (void)argv;
  69     auto js = new TinyJS::Interpreter();
  70     /* add the functions from TinyJS_Functions.cpp */
  71     registerFunctions(js);
  72     /* Add a native function */
  73     js->addNative("function print(text)", &js_print, 0);
  74     js->addNative("function dump()", &js_dump, js);
  75     /*
  76     * Execute out bit of code - we could call 'evaluate' here if
  77     * we wanted something returned
  78     */
  79     js->execute("var lets_quit = 0; function quit() { lets_quit = 1; }");
  80     printf(
  81         "Interactive mode...\n"
  82         "Type quit(); to exit, or print(...); to print something, or dump() to dump the symbol table!"
  83     );
  84     while (js->evaluate("lets_quit") == "0")
  85     {
  86         char buffer[2048];
  87         fgets(buffer, sizeof(buffer), stdin);
  88         try
  89         {
  90             js->execute(buffer);
  91         }
  92         catch(TinyJS::RuntimeError *e)
  93         {
  94           printf("ERROR: %s\n", e->text.c_str());
  95         }
  96     }
  97     delete js;
  98     return 0;
  99 }