From 7fbb36e4b1aa40fad42e519305882ba8a9fa7f35 Mon Sep 17 00:00:00 2001
From: Danny Yoo <dyoo@cs.wpi.edu>
Date: Mon, 19 Mar 2012 18:22:31 -0400
Subject: [PATCH] trying to write simple binding to google maps

---
 examples/google-maps/maps.rkt       | 44 +++++++++++++++++++++++++++++
 js-assembler/runtime-src/runtime.js | 31 +++++++++++---------
 2 files changed, 62 insertions(+), 13 deletions(-)
 create mode 100644 examples/google-maps/maps.rkt

diff --git a/examples/google-maps/maps.rkt b/examples/google-maps/maps.rkt
new file mode 100644
index 0000000..b382c08
--- /dev/null
+++ b/examples/google-maps/maps.rkt
@@ -0,0 +1,44 @@
+#lang planet dyoo/whalesong
+
+;; A simple binding to Google Maps.
+
+(require (planet dyoo/whalesong/js))
+
+
+;; initialize-google-maps-api!: string boolean -> void
+;; Dynamically loads the Google Maps API.
+(define raw-initialize-google-maps-api!
+  (js-async-function->procedure
+   #<<EOF
+function(success, fail, key, sensor) {
+    var callbackName = 'afterGoogleMapsInitialized' + plt.runtime.makeRandomNonce();
+    window[callbackName] = function() {
+        delete(window[callbackName]);
+        // At this point, we know the API has been instantiated ok.
+        success();
+    };
+
+    var script = document.createElement("script");
+    script.type = "text/javascript";
+    script.src = "http://maps.googleapis.com/maps/api/js?key="
+         + encodeURIComponent(key) + "&sensor=" + (sensor ? 'true' : 'false')
+         + "&callback=" + encodeURIComponent(callbackName);
+    document.body.appendChild(script);
+}
+EOF
+))
+
+
+(define (initialize-google-maps-api! key sensor)
+  (unless (string? key)
+    (raise-type-error 'initialize-google-maps-api! "string" 0 key))
+  (unless (boolean? sensor)
+    (raise-type-error 'initialize-google-maps-api! "boolean" 1 sensor))
+  (void (raw-initialize-google-maps-api! key sensor)))
+
+
+
+;; This is dyoo's API key.
+(printf "Loading google maps api\n");
+(initialize-google-maps-api! "AIzaSyCRKQNI_nbyyN1286cssEy3taKj5IZcHN8" #t)
+(printf "google maps api loaded\n")
\ No newline at end of file
diff --git a/js-assembler/runtime-src/runtime.js b/js-assembler/runtime-src/runtime.js
index e4aa3df..b978485 100644
--- a/js-assembler/runtime-src/runtime.js
+++ b/js-assembler/runtime-src/runtime.js
@@ -163,6 +163,20 @@
 
 
 
+    // makeRandomNonce: -> string
+    // Creates a randomly-generated nonce.
+    var makeRandomNonce = function() {
+        var chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz";
+        var LEN = 32;
+        var result = [];
+        var i;
+        for (i = 0; i < LEN; i++) {
+            result.push(chars.charAt(Math.floor(Math.random() * chars.length)));
+        }
+        return result.join('');
+    };
+
+
     //////////////////////////////////////////////////////////////////////
 
     // Exclusive Locks.  Even though JavaScript is a single-threaded
@@ -175,23 +189,11 @@
         this.waiters = [];
     };
 
-    // makeRandomNonce: -> string
-    // Creates a randomly-generated nonce.
-    ExclusiveLock.makeRandomNonce = function() {
-        var chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz";
-        var LEN = 32;
-        var result = [];
-        var i;
-        for (i = 0; i < LEN; i++) {
-            result.push(chars.charAt(Math.floor(Math.random() * chars.length)));
-        }
-        return result.join('');
-    };
 
     ExclusiveLock.prototype.acquire = function(id, onAcquire) {
         var that = this;
         if (!id) {
-            id = ExclusiveLock.makeRandomNonce();
+            id = makeRandomNonce();
         }
 
         this.alreadyReleased = false;
@@ -1268,4 +1270,7 @@
     exports['checkedCdr'] = checkedCdr;
     exports['checkedVectorRef'] = checkedVectorRef;
     exports['checkedVectorSet'] = checkedVectorSet;
+
+
+    exports['makeRandomNonce'] = makeRandomNonce;
 }(this.plt, this.plt.baselib));
\ No newline at end of file