app = angular.module 'pdfTextLayer', [] app.factory 'pdfTextLayer', [ () -> # TRANSLATED FROM pdf.js-1.0.712 # pdf.js-1.0.712/web/ui_utils.js # pdf.js-1.0.712/web/text_layer_builder.js # -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- # Copyright 2012 Mozilla Foundation # * # * Licensed under the Apache License, Version 2.0 (the "License"); # * you may not use this file except in compliance with the License. # * You may obtain a copy of the License at # * # * http://www.apache.org/licenses/LICENSE-2.0 # * # * Unless required by applicable law or agreed to in writing, software # * distributed under the License is distributed on an "AS IS" BASIS, # * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # * See the License for the specific language governing permissions and # * limitations under the License. # # globals CustomStyle, scrollIntoView, PDFJS # ms # optimised CSS custom property getter/setter CustomStyle = (CustomStyleClosure = -> # As noted on: http://www.zachstronaut.com/posts/2009/02/17/ # animate-css-transforms-firefox-webkit.html # in some versions of IE9 it is critical that ms appear in this list # before Moz CustomStyle = -> prefixes = [ 'ms' 'Moz' 'Webkit' 'O' ] _cache = {} CustomStyle.getProp = get = (propName, element) -> # check cache only when no element is given return _cache[propName] if arguments.length is 1 and typeof _cache[propName] is 'string' element = element or document.documentElement style = element.style prefixed = undefined uPropName = undefined # test standard property first return (_cache[propName] = propName) if typeof style[propName] is 'string' # capitalize uPropName = propName.charAt(0).toUpperCase() + propName.slice(1) # test vendor specific properties i = 0 l = prefixes.length while i < l prefixed = prefixes[i] + uPropName return (_cache[propName] = prefixed) if typeof style[prefixed] is 'string' i++ #if all fails then set to undefined _cache[propName] = 'undefined' CustomStyle.setProp = set = (propName, element, str) -> prop = @getProp(propName) element.style[prop] = str if prop isnt 'undefined' return CustomStyle )() ################################# isAllWhitespace = (str) -> not NonWhitespaceRegexp.test(str) 'use strict' FIND_SCROLL_OFFSET_TOP = -50 FIND_SCROLL_OFFSET_LEFT = -400 MAX_TEXT_DIVS_TO_RENDER = 100000 RENDER_DELAY = 200 NonWhitespaceRegexp = /\S/ ###* TextLayerBuilder provides text-selection functionality for the PDF. It does this by creating overlay divs over the PDF text. These divs contain text that matches the PDF text they are overlaying. This object also provides a way to highlight text that is being searched for. ### class pdfTextLayer constructor: (options) -> @textLayerDiv = options.textLayerDiv @layoutDone = false @divContentDone = false @pageIdx = options.pageIndex @matches = [] @lastScrollSource = options.lastScrollSource or null @viewport = options.viewport @isViewerInPresentationMode = options.isViewerInPresentationMode @textDivs = [] @findController = options.findController or null renderLayer: () -> textLayerFrag = document.createDocumentFragment() textDivs = @textDivs textDivsLength = textDivs.length canvas = document.createElement('canvas') ctx = canvas.getContext('2d') # No point in rendering many divs as it would make the browser # unusable even after the divs are rendered. return if textDivsLength > MAX_TEXT_DIVS_TO_RENDER lastFontSize = undefined lastFontFamily = undefined i = 0 while i < textDivsLength textDiv = textDivs[i] continue if textDiv.dataset.isWhitespace fontSize = textDiv.style.fontSize fontFamily = textDiv.style.fontFamily # Only build font string and set to context if different from last. if fontSize isnt lastFontSize or fontFamily isnt lastFontFamily ctx.font = fontSize + ' ' + fontFamily lastFontSize = fontSize lastFontFamily = fontFamily width = ctx.measureText(textDiv.textContent).width if width > 0 textLayerFrag.appendChild textDiv # Dataset values come of type string. textScale = textDiv.dataset.canvasWidth / width rotation = textDiv.dataset.angle transform = 'scale(' + textScale + ', 1)' transform = 'rotate(' + rotation + 'deg) ' + transform if rotation CustomStyle.setProp 'transform', textDiv, transform CustomStyle.setProp 'transformOrigin', textDiv, '0% 0%' i++ @textLayerDiv.appendChild textLayerFrag return appendText: (geom, styles) -> style = styles[geom.fontName] textDiv = document.createElement('div') @textDivs.push textDiv if isAllWhitespace(geom.str) textDiv.dataset.isWhitespace = true return tx = PDFJS.Util.transform(@viewport.transform, geom.transform) angle = Math.atan2(tx[1], tx[0]) angle += Math.PI / 2 if style.vertical fontHeight = Math.sqrt((tx[2] * tx[2]) + (tx[3] * tx[3])) fontAscent = fontHeight if style.ascent fontAscent = style.ascent * fontAscent else fontAscent = (1 + style.descent) * fontAscent if style.descent left = undefined top = undefined if angle is 0 left = tx[4] top = tx[5] - fontAscent else left = tx[4] + (fontAscent * Math.sin(angle)) top = tx[5] - (fontAscent * Math.cos(angle)) textDiv.style.left = left + 'px' textDiv.style.top = top + 'px' textDiv.style.fontSize = fontHeight + 'px' textDiv.style.fontFamily = style.fontFamily textDiv.textContent = geom.str # |fontName| is only used by the Font Inspector. This test will succeed # when e.g. the Font Inspector is off but the Stepper is on, but it's # not worth the effort to do a more accurate test. textDiv.dataset.fontName = geom.fontName if PDFJS.pdfBug # Storing into dataset will convert number into string. textDiv.dataset.angle = angle * (180 / Math.PI) if angle isnt 0 if style.vertical textDiv.dataset.canvasWidth = geom.height * @viewport.scale else textDiv.dataset.canvasWidth = geom.width * @viewport.scale return setTextContent: (textContent) -> @textContent = textContent textItems = textContent.items i = 0 len = textItems.length while i < len @appendText textItems[i], textContent.styles i++ @divContentDone = true @renderLayer() return ]