Initial API implementation

src/api.js

@@ -0,0 +1,141 @@
+/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
+
+(function pdfApiWrapper() {
+  function PdfPageWrapper(page) {
+    this.page = page;
+  }
+  PdfPageWrapper.prototype = {
+    get width() {
+      return this.page.width;
+    },
+    get height() {
+      return this.page.height;
+    },
+    get stats() {
+      return this.page.stats;
+    },
+    get ref() {
+      return this.page.ref;
+    },
+    get view() {
+      return this.page.view;
+    },
+    rotatePoint: function(x, y) {
+      return this.page.rotatePoint(x, y);
+    },
+    getAnnotations: function() {
+      var promise = new PDFJS.Promise();
+      var annotations = this.page.getAnnotations();
+      promise.resolve(annotations);
+      return promise;
+    },
+    render: function(renderContext) {
+      var promise = new PDFJS.Promise();
+      this.page.startRendering(renderContext.canvasContext,
+        function complete(error) {
+          if (error)
+            promise.reject(error);
+          else
+            promise.resolve();
+        },
+        renderContext.textLayer);
+      return promise;
+    },
+    getTextContent: function() {
+      var promise = new PDFJS.Promise();
+      var textContent = 'page text'; // not implemented
+      promise.resolve(textContent);
+      return promise;
+    },
+    getOperationList: function() {
+      var promise = new PDFJS.Promise();
+      var operationList = { // not implemented
+        dependencyFontsID: null,
+        operatorList: null
+      };
+      promise.resolve(operationList);
+      return promise;
+    }
+  };
+
+  function PdfDocumentWrapper(pdf) {
+    this.pdf = pdf;
+  }
+  PdfDocumentWrapper.prototype = {
+    get numPages() {
+      return this.pdf.numPages;
+    },
+    get fingerprint() {
+      return this.pdf.fingerPrint;
+    },
+    getPage: function(number) {
+      var promise = new PDFJS.Promise();
+      var page = this.pdf.getPage(number);
+      promise.resolve(new PdfPageWrapper(page));
+      return promise;
+    },
+    getDestinations: function() {
+      var promise = new PDFJS.Promise();
+      var destinations = this.pdf.catalog.destinations;
+      promise.resolve(destinations);
+      return promise;
+    },
+    getOutline: function() {
+      var promise = new PDFJS.Promise();
+      var outline = this.pdf.catalog.documentOutline;
+      promise.resolve(outline);
+      return promise;
+    },
+    getMetadata: function() {
+      var promise = new PDFJS.Promise();
+      var info = this.pdf.info;
+      var metadata = this.pdf.catalog.metadata;
+      promise.resolve(info, metadata ? new PDFJS.Metadata(metadata) : null);
+      return promise;
+    }
+  };
+
+  PDFJS.getDocument = function getDocument(source) {
+    var promise = new PDFJS.Promise();
+    if (typeof source === 'string') {
+      // fetch url
+      PDFJS.getPdf(
+        {
+          url: source,
+          progress: function getPdfProgress(evt) {
+            if (evt.lengthComputable)
+              promise.progress({
+                loaded: evt.loaded,
+                total: evt.total
+              });
+          },
+          error: function getPdfError(e) {
+            promise.reject('Unexpected server response of ' +
+              e.target.status + '.');
+          }
+        },
+        function getPdfLoad(data) {
+          var pdf = null;
+          try {
+            pdf = new PDFJS.PDFDoc(data);
+          } catch (e) {
+            promise.reject('An error occurred while reading the PDF.', e);
+          }
+          if (pdf)
+            promise.resolve(new PdfDocumentWrapper(pdf));
+        });
+    } else {
+      // assuming the source is array, instantiating directly from it
+      var pdf = null;
+      try {
+        pdf = new PDFJS.PDFDoc(source);
+      } catch (e) {
+        promise.reject('An error occurred while reading the PDF.', e);
+      }
+      if (pdf)
+        promise.resolve(new PdfDocumentWrapper(pdf));
+    }
+    return promise;
+  };
+})();

src/util.js

@@ -275,7 +275,7 @@ function isPDFFunction(v) {
  * can be set. If any of these happens twice or the data is required before
  * it was set, an exception is throw.
  */
-var Promise = (function PromiseClosure() {
+var Promise = PDFJS.Promise = (function PromiseClosure() {
   var EMPTY_PROMISE = {};
 
   /**
@@ -297,6 +297,7 @@ var Promise = (function PromiseClosure() {
     }
     this.callbacks = [];
     this.errbacks = [];
+    this.progressbacks = [];
   };
   /**
    * Builds a promise that is resolved when all the passed in promises are
@@ -312,7 +313,7 @@ var Promise = (function PromiseClosure() {
       deferred.resolve(results);
       return deferred;
     }
-    for (var i = 0; i < unresolved; ++i) {
+    for (var i = 0, ii = promises.length; i < ii; ++i) {
       var promise = promises[i];
       promise.then((function(i) {
         return function(value) {
@@ -376,6 +377,13 @@ var Promise = (function PromiseClosure() {
       }
     },
 
+    progress: function Promise_progress(data) {
+      var callbacks = this.progressbacks;
+      for (var i = 0, ii = callbacks.length; i < ii; i++) {
+        callbacks[i].call(null, data);
+      }
+    },
+
     reject: function Promise_reject(reason) {
       if (this.isRejected) {
         error('A Promise can be rejected only once ' + this.name);
@@ -393,7 +401,7 @@ var Promise = (function PromiseClosure() {
       }
     },
 
-    then: function Promise_then(callback, errback) {
+    then: function Promise_then(callback, errback, progressback) {
       if (!callback) {
         error('Requiring callback' + this.name);
       }
@@ -410,6 +418,9 @@ var Promise = (function PromiseClosure() {
         if (errback)
           this.errbacks.push(errback);
       }
+
+      if (progressback)
+        this.progressbacks.push(progressback);
     }
   };