pdf.js

/*

Original Project
Copyright (c) 2009 James Hall http://code.google.com/p/jspdf/
https://github.com/MrRio/jsPDF

Contributor(s) - pdf.js
Copyright (c) 2010 Marak Squires http://github.com/marak/pdf.js/


Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
*/

/* dual-side hack, i sorry */
var sprintf;
var Base64;
if(typeof exports == 'undefined'){
  var exports = window;
  var Base64 = window;
}


var pdf = exports.pdf = function(){
  
  // Private properties
  var version = '20090504';
  var buffer = '';
  
  var pdfVersion = '1.3'; // PDF Version
  var defaultPageFormat = 'a4';
  var pageFormats = { // Size in mm of various paper formats
    'a3': [841.89, 1190.55],
    'a4': [595.28, 841.89],
    'a5': [420.94, 595.28],
    'letter': [612, 792],
    'legal': [612, 1008]
  };
  var textColor = '0 g';
  var page = 0;
  var objectNumber = 2; // 'n' Current object number
  var state = 0; // Current document state
  var pages = new Array();
  var offsets = new Array(); // List of offsets
  var lineWidth = 0.200025; // 2mm
  var pageHeight;
  var k; // Scale factor
  var unit = 'mm'; // Default to mm for units
  var documentProperties = {};
  var fontSize = 16; // Default font size
  var pageFontSize = 16;
  var font = 'Helvetica'; // Default font
  var pageFont = font;
  var fonts = {}; // fonts holder, namely use in putRessource
  var fontIndex = 0; // F1, F2, etc. using setFont
  var fontsNumber = {}; // object number holder for fonts

  // Initilisation 
  if (unit == 'pt') {
    k = 1;
  } else if(unit == 'mm') {
    k = 72/25.4;
  } else if(unit == 'cm') {
    k = 72/2.54;
  } else if(unit == 'in') {
    k = 72;
  }
  
  // Private functions
  var newObject = function() {
    //Begin a new object
    objectNumber ++;
    offsets[objectNumber] = buffer.length;
    out(objectNumber + ' 0 obj');   
  }
  
  
  var putHeader = function() {
    out('%PDF-' + pdfVersion);
  }
  
  var putPages = function() {
    
    // TODO: Fix, hardcoded to a4 portrait
    var wPt = pageWidth * k;
    var hPt = pageHeight * k;

    for(n=1; n <= page; n++) {
      newObject();
      out('<</Type /Page');
      out('/Parent 1 0 R'); 
      out('/Resources 2 0 R');
      out('/Contents ' + (objectNumber + 1) + ' 0 R>>');
      out('endobj');
      
      //Page content
      p = pages[n];
      newObject();
      out('<</Length ' + p.length  + '>>');
      putStream(p);
      out('endobj');          
    }
    offsets[1] = buffer.length;
    out('1 0 obj');
    out('<</Type /Pages');
    var kids='/Kids [';
    for (i = 0; i < page; i++) {
      kids += (3 + 2 * i) + ' 0 R ';
    }
    out(kids + ']');
    out('/Count ' + page);
    out(sprintf('/MediaBox [0 0 %.2f %.2f]', wPt, hPt));
    out('>>');
    out('endobj');    
  }
  
  var putStream = function(str) {
    out('stream');
    out(str);
    out('endstream');
  }
  
  var putResources = function() {
    var f;
    // Deal with fonts, defined in fonts by user (using setFont).
    if(fontIndex) {
      for( f in fonts ) {
        putFonts(f);
      }
    } else {
      // if fontIndex still 0, means that setFont was not used, fallback to default
      fonts[font] = 0;
      putFonts(font);            
    }

    
    putImages();
    
    //Resource dictionary
    offsets[2] = buffer.length;
    out('2 0 obj');
    out('<<');
    putResourceDictionary();
    out('>>');
    out('endobj');
  } 
  
  var putFonts = function(font) {
    newObject();
    fontsNumber[font] = objectNumber;
    
    out('<</Type /Font');
    out('/BaseFont /' + font);
    out('/Subtype /Type1');
    out('/Encoding /WinAnsiEncoding');
    out('>>');
    out('endobj');
  }
  
  var putImages = function() {
    // TODO
  }
  
  var _drawLine = function(x1, y1, x2, y2, weight, style) {
    if (typeof weight === "undefined" || weight < 0) {
      weight = 1;
    }
    
    if (typeof style === "undefined") {
      style = '[] 0 d';
    } else {
      if (style === 'dotted') {
        style = '[1 2] 1 d';
      } else if (style === 'dashed') {
        style = '[4 2] 2 d';
      } else {
        style = '[] 0 d';
      }
    }
    
    var str = sprintf('\n/LEP BMC \nq\n0 G\n%.2f w\n%s\n0 J\n1 0 0 1 0 0 cm\n%.2f %.2f m\n%.2f %.2f l\nS\nQ\nEMC\n', weight, style, k*x1, k*(pageHeight-y1), k*x2, k*(pageHeight-y2));
    out(str);
  };
  
  var putResourceDictionary = function() {
    var i = 0, index, fx;
    
    out('/ProcSet [/PDF /Text /ImageB /ImageC /ImageI]');
    out('/Font <<');
    
    // Do this for each font, the '1' bit is the index of the font
    // fontNumber is currently the object number related to 'putFonts'
    for( index in fontsNumber ) {
      out(fonts[index] + ' ' + fontsNumber[index] + ' 0 R');
    }
    
    out('>>');
    out('/XObject <<');
    putXobjectDict();
    out('>>');
  }
  
  var putXobjectDict = function() {
    // TODO
    // Loop through images
  }
  
  
  var putInfo = function() {
    out('/Producer (pdf.js ' + version + ')');
    if(documentProperties.title != undefined) {
      out('/Title (' + pdfEscape(documentProperties.title) + ')');
    }
    if(documentProperties.subject != undefined) {
      out('/Subject (' + pdfEscape(documentProperties.subject) + ')');
    }
    if(documentProperties.author != undefined) {
      out('/Author (' + pdfEscape(documentProperties.author) + ')');
    }
    if(documentProperties.keywords != undefined) {
      out('/Keywords (' + pdfEscape(documentProperties.keywords) + ')');
    }
    if(documentProperties.creator != undefined) {
      out('/Creator (' + pdfEscape(documentProperties.creator) + ')');
    }   
    var created = new Date();
    var year = created.getFullYear();
    var month = (created.getMonth() + 1);
    var day = created.getDate();
    var hour = created.getHours();
    var minute = created.getMinutes();
    var second = created.getSeconds();
    out('/CreationDate (D:' + sprintf('%02d%02d%02d%02d%02d%02d', year, month, day, hour, minute, second) + ')');
  }
  
  var putCatalog = function () {
    out('/Type /Catalog');
    out('/Pages 1 0 R');
    // TODO: Add zoom and layout modes
    out('/OpenAction [3 0 R /FitH null]');
    out('/PageLayout /OneColumn');
  } 
  
  function putTrailer() {
    out('/Size ' + (objectNumber + 1));
    out('/Root ' + objectNumber + ' 0 R');
    out('/Info ' + (objectNumber - 1) + ' 0 R');
  } 
  
  var endDocument = function() {
    state = 1;
    putHeader();
    putPages();
    
    putResources();
    //Info
    newObject();
    out('<<');
    putInfo();
    out('>>');
    out('endobj');
    
    //Catalog
    newObject();
    out('<<');
    putCatalog();
    out('>>');
    out('endobj');
    
    //Cross-ref
    var o = buffer.length;
    out('xref');
    out('0 ' + (objectNumber + 1));
    out('0000000000 65535 f ');
    for (var i=1; i <= objectNumber; i++) {
      out(sprintf('%010d 00000 n ', offsets[i]));
    }
    //Trailer
    out('trailer');
    out('<<');
    putTrailer();
    out('>>');
    out('startxref');
    out(o);
    out('%%EOF');
    state = 3;    
  }
  
  var beginPage = function() {
    page ++;
    // Do dimension stuff
    state = 2;
    pages[page] = '';
    
    // TODO: Hardcoded at A4 and portrait
    pageHeight = pageFormats['a4'][1] / k;
    pageWidth = pageFormats['a4'][0] / k;
  }
  
  var out = function(string) {
    if(state == 2) {
      pages[page] += string + '\n';
    } else {
      buffer += string + '\n';
    }
  }
  
  var _addPage = function() {
    beginPage();
    // Set line width
    out(sprintf('%.2f w', (lineWidth * k)));
    
    // 16 is the font size
    pageFontSize = fontSize;
    pageFont = font;
    out('BT ' + fonts[font] + ' ' + parseInt(fontSize) + '.00 Tf ET');    
  }
  
  // Add the first page automatically
  _addPage(); 

  // Escape text
  var pdfEscape = function(text) {
    return text.replace(/\\/g, '\\\\').replace(/\(/g, '\\(').replace(/\)/g, '\\)');
  }
  
  return {
    addPage: function() {
      _addPage();
    },
    text: function(x, y, text, f) {
      if(f) {
        this.setFont(f);
      }
      
      // need either page height or page font
      if(pageFontSize !== fontSize || pageFont !== font) {
        pageFontSize = fontSize;
        pageFont = font;
      }
      
      var str = sprintf('BT %.2f %.2f Td (%s) Tj ET', x * k, (pageHeight - y) * k, pdfEscape(text))   
      out('BT ' + (fonts[font] ? fonts[font] : '/F0') + ' ' + parseInt(fontSize, 10) + '.00 Tf ET');
      out(str);
    },
    drawRect: function(x, y, w, h, style) {
      var op = 'S';
      if (style === 'F') {
        op = 'f';
      } else if (style === 'FD' || style === 'DF') {
        op = 'B';
      }
      out(sprintf('%.2f %.2f %.2f %.2f re %s', x * k, (pageHeight - y) * k, w * k, -h * k, op));
    },
    drawLine: _drawLine,
    setProperties: function(properties) {
      documentProperties = properties;
    },
    addImage: function(imageData, format, x, y, w, h) {
    
    },
    output: function(type, options) {
      endDocument();
      if(type == undefined) {
        return buffer;
      }
      if(type == 'datauri') {
        return 'data:application/pdf;filename='+options.fileName+';base64,' + Base64.encode(buffer);
      }
      // @TODO: Add different output options
    },
    setFontSize: function(size) {
      fontSize = size;
    },
    setFont: function(f){
      if( !(f in fonts) ) {
        // if not known font yet, add in fonts array, then used in endDocument
        // while putting ressource
        fonts[f] = '/F' + (fontIndex++);
      }
      font = f;
    }
  }

};

/**
*
*  Base64 encode / decode
*  http://www.webtoolkit.info/
*
**/
 
// private property
var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
 
// public method for encoding
exports.encode = function (input) {
  var output = "";
  var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
  var i = 0;
 
  input = utf8_encode(input);
 
  while (i < input.length) {
 
    chr1 = input.charCodeAt(i++);
    chr2 = input.charCodeAt(i++);
    chr3 = input.charCodeAt(i++);
 
    enc1 = chr1 >> 2;
    enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
    enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
    enc4 = chr3 & 63;
 
    if (isNaN(chr2)) {
      enc3 = enc4 = 64;
    } else if (isNaN(chr3)) {
      enc4 = 64;
    }
 
    output = output +
    keyStr.charAt(enc1) + keyStr.charAt(enc2) +
    keyStr.charAt(enc3) + keyStr.charAt(enc4);
 
  }
 
  return output;
}
 
// public method for decoding
exports.decode = function (input) {
  var output = "";
  var chr1, chr2, chr3;
  var enc1, enc2, enc3, enc4;
  var i = 0;
 
  input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
 
  while (i < input.length) {
 
    enc1 = keyStr.indexOf(input.charAt(i++));
    enc2 = keyStr.indexOf(input.charAt(i++));
    enc3 = keyStr.indexOf(input.charAt(i++));
    enc4 = keyStr.indexOf(input.charAt(i++));
 
    chr1 = (enc1 << 2) | (enc2 >> 4);
    chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
    chr3 = ((enc3 & 3) << 6) | enc4;
 
    output = output + String.fromCharCode(chr1);
 
    if (enc3 != 64) {
      output = output + String.fromCharCode(chr2);
    }
    if (enc4 != 64) {
      output = output + String.fromCharCode(chr3);
    }
 
  }
 
  output = utf8_decode(output);
 
  return output;
 
}
 
// private method for UTF-8 encoding
function utf8_encode(string) {
  string = string.replace(/\r\n/g,"\n");
  var utftext = "";
 
  for (var n = 0; n < string.length; n++) {
 
    var c = string.charCodeAt(n);
 
    if (c < 128) {
      utftext += String.fromCharCode(c);
    }
    else if((c > 127) && (c < 2048)) {
      utftext += String.fromCharCode((c >> 6) | 192);
      utftext += String.fromCharCode((c & 63) | 128);
    }
    else {
      utftext += String.fromCharCode((c >> 12) | 224);
      utftext += String.fromCharCode(((c >> 6) & 63) | 128);
      utftext += String.fromCharCode((c & 63) | 128);
    }
 
  }
 
  return utftext;
}
 
// private method for UTF-8 decoding
function utf8_decode(utftext) {
  var string = "";
  var i = 0;
  var c = c1 = c2 = 0;
 
  while ( i < utftext.length ) {
 
    c = utftext.charCodeAt(i);
 
    if (c < 128) {
      string += String.fromCharCode(c);
      i++;
    }
    else if((c > 191) && (c < 224)) {
      c2 = utftext.charCodeAt(i+1);
      string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
      i += 2;
    }
    else {
      c2 = utftext.charCodeAt(i+1);
      c3 = utftext.charCodeAt(i+2);
      string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
      i += 3;
    }
 
  }
 
  return string;
}
 
/**** BUNDLED SOME EXTRA STUFF FOR THE BROWSER, IF YOU REALLY DONT LIKE THIS HERE IN YOUR NODE VERSION YOU CAN DELETE IT.... SORRY... ******/
// Modified to work as a CommonJS/NodeJS lib
//    Use:  sprintf = require("sprintf").sprintf

var sprintf = exports.sprintf = function ( ) {
    // Return a formatted string  
    // 
    // version: 903.3016
    // discuss at: http://phpjs.org/functions/sprintf
    // +   original by: Ash Searle (http://hexmen.com/blog/)
    // + namespaced by: Michael White (http://getsprink.com)
    // +    tweaked by: Jack
    // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +      input by: Paulo Ricardo F. Santos
    // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +      input by: Brett Zamir (http://brettz9.blogspot.com)
    // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // *     example 1: sprintf("%01.2f", 123.1);
    // *     returns 1: 123.10
    // *     example 2: sprintf("[%10s]", 'monkey');
    // *     returns 2: '[    monkey]'
    // *     example 3: sprintf("[%'#10s]", 'monkey');
    // *     returns 3: '[####monkey]'
    var regex = /%%|%(\d+\$)?([-+\'#0 ]*)(\*\d+\$|\*|\d+)?(\.(\*\d+\$|\*|\d+))?([scboxXuidfegEG])/g;
    var a = arguments, i = 0, format = a[i++];

    // pad()
    var pad = function(str, len, chr, leftJustify) {
        if (!chr) chr = ' ';
        var padding = (str.length >= len) ? '' : Array(1 + len - str.length >>> 0).join(chr);
        return leftJustify ? str + padding : padding + str;
    };

    // justify()
    var justify = function(value, prefix, leftJustify, minWidth, zeroPad, customPadChar) {
        var diff = minWidth - value.length;
        if (diff > 0) {
            if (leftJustify || !zeroPad) {
                value = pad(value, minWidth, customPadChar, leftJustify);
            } else {
                value = value.slice(0, prefix.length) + pad('', diff, '0', true) + value.slice(prefix.length);
            }
        }
        return value;
    };

    // formatBaseX()
    var formatBaseX = function(value, base, prefix, leftJustify, minWidth, precision, zeroPad) {
        // Note: casts negative numbers to positive ones
        var number = value >>> 0;
        prefix = prefix && number && {'2': '0b', '8': '0', '16': '0x'}[base] || '';
        value = prefix + pad(number.toString(base), precision || 0, '0', false);
        return justify(value, prefix, leftJustify, minWidth, zeroPad);
    };

    // formatString()
    var formatString = function(value, leftJustify, minWidth, precision, zeroPad, customPadChar) {
        if (precision != null) {
            value = value.slice(0, precision);
        }
        return justify(value, '', leftJustify, minWidth, zeroPad, customPadChar);
    };

    // doFormat()
    var doFormat = function(substring, valueIndex, flags, minWidth, _, precision, type) {
        var number;
        var prefix;
        var method;
        var textTransform;
        var value;

        if (substring == '%%') return '%';

        // parse flags
        var leftJustify = false, positivePrefix = '', zeroPad = false, prefixBaseX = false, customPadChar = ' ';
        var flagsl = flags.length;
        for (var j = 0; flags && j < flagsl; j++) switch (flags.charAt(j)) {
            case ' ': positivePrefix = ' '; break;
            case '+': positivePrefix = '+'; break;
            case '-': leftJustify = true; break;
            case "'": customPadChar = flags.charAt(j+1); break;
            case '0': zeroPad = true; break;
            case '#': prefixBaseX = true; break;
        }

        // parameters may be null, undefined, empty-string or real valued
        // we want to ignore null, undefined and empty-string values
        if (!minWidth) {
            minWidth = 0;
        } else if (minWidth == '*') {
            minWidth = +a[i++];
        } else if (minWidth.charAt(0) == '*') {
            minWidth = +a[minWidth.slice(1, -1)];
        } else {
            minWidth = +minWidth;
        }

        // Note: undocumented perl feature:
        if (minWidth < 0) {
            minWidth = -minWidth;
            leftJustify = true;
        }

        if (!isFinite(minWidth)) {
            throw new Error('sprintf: (minimum-)width must be finite');
        }

        if (!precision) {
            precision = 'fFeE'.indexOf(type) > -1 ? 6 : (type == 'd') ? 0 : void(0);
        } else if (precision == '*') {
            precision = +a[i++];
        } else if (precision.charAt(0) == '*') {
            precision = +a[precision.slice(1, -1)];
        } else {
            precision = +precision;
        }

        // grab value using valueIndex if required?
        value = valueIndex ? a[valueIndex.slice(0, -1)] : a[i++];

        switch (type) {
            case 's': return formatString(String(value), leftJustify, minWidth, precision, zeroPad, customPadChar);
            case 'c': return formatString(String.fromCharCode(+value), leftJustify, minWidth, precision, zeroPad);
            case 'b': return formatBaseX(value, 2, prefixBaseX, leftJustify, minWidth, precision, zeroPad);
            case 'o': return formatBaseX(value, 8, prefixBaseX, leftJustify, minWidth, precision, zeroPad);
            case 'x': return formatBaseX(value, 16, prefixBaseX, leftJustify, minWidth, precision, zeroPad);
            case 'X': return formatBaseX(value, 16, prefixBaseX, leftJustify, minWidth, precision, zeroPad).toUpperCase();
            case 'u': return formatBaseX(value, 10, prefixBaseX, leftJustify, minWidth, precision, zeroPad);
            case 'i':
            case 'd': {
                number = parseInt(+value);
                prefix = number < 0 ? '-' : positivePrefix;
                value = prefix + pad(String(Math.abs(number)), precision, '0', false);
                return justify(value, prefix, leftJustify, minWidth, zeroPad);
            }
            case 'e':
            case 'E':
            case 'f':
            case 'F':
            case 'g':
            case 'G': {
                number = +value;
                prefix = number < 0 ? '-' : positivePrefix;
                method = ['toExponential', 'toFixed', 'toPrecision']['efg'.indexOf(type.toLowerCase())];
                textTransform = ['toString', 'toUpperCase']['eEfFgG'.indexOf(type) % 2];
                value = prefix + Math.abs(number)[method](precision);
                return justify(value, prefix, leftJustify, minWidth, zeroPad)[textTransform]();
            }
            default: return substring;
        }
    };

    return format.replace(regex, doFormat);
}