pdfkit

# This regular expression is used for splitting a string into wrappable words WORD_RE = /([^ ,\/!.?:;\-\n]+[ ,\/!.?:;\-]*)|\n/g module.exports = initText: -> # Current coordinates @x = 0 @y = 0 @_lineGap = 0 # Keeps track of what has been set in the document @_textState = mode: 0 wordSpacing: 0 characterSpacing: 0 # state of the wrapping algorithm @_wrapState = {} lineGap: (@_lineGap) -> return this text: (text, x = {}, y, options = {}) -> if typeof x is 'object' options = x x = null # Convert text to a string text = '' + text # Update the current position if x? or y? @x = x or @x @y = y or @y # wrap to margins if no x or y position passed else margins = @page.margins options.width ?= @page.width - @x - margins.right options.height ?= @page.height - @y - margins.bottom # wrap to columns options.columns ||= 1 options.columnGap ?= 18 # 1/4 inch # if the wordSpacing option is specified, remove multiple consecutive spaces if options.wordSpacing text = text.replace(/\s+/g, ' ') # word wrapping if options.width @_wrap text, options # newlines else if (matches = text.split '\n').length > 1 @_line match, options for match in matches # single line else @_line text, options return this moveDown: (lines = 1) -> @y += @currentLineHeight(true) * lines + @_lineGap return this moveUp: (lines = 1) -> @y -= @currentLineHeight(true) * lines + @_lineGap return this list: (array, ox, oy) -> gap = Math.round (@_font.ascender / 1000 * @_fontSize) / 2 @x = x = ox or @x @y = y = oy or @y for item in array @circle x + 3, @y + gap + 3, 3 @text item, x + 15 @y += 3 @x = x @fill() _line: (text, options) -> wrap = @_wrapState paragraphGap = (wrap.firstLine and @y isnt wrap.startY and options.paragraphGap) or 0 lineGap = options.lineGap or @_lineGap or 0 @_fragment text, @x, @y + paragraphGap, options @y += @currentLineHeight(true) + lineGap + paragraphGap _fragment: (text, x, y, options = {}) -> text = '' + text return if text.length is 0 state = @_textState wrap = @_wrapState # handle options align = options.align or 'left' indent = (wrap.firstLine and options.indent) or 0 wordSpacing = options.wordSpacing or 0 characterSpacing = options.characterSpacing or 0 # text alignments if options.width lineWidth = wrap.lineWidth - indent - wrap.extraSpace switch align when 'right' x += lineWidth - @widthOfString(text) when 'center' x += lineWidth / 2 - @widthOfString(text) / 2 when 'justify' # don't justify the last line of paragraphs break if wrap.lastLine # split the line into words words = text.match(WORD_RE) break unless words # calculate the word spacing value textWidth = @widthOfString text.replace(/\s+/g, '') wordSpacing = (lineWidth - textWidth) / (words.length - 1) - @widthOfString(' ') # indentation support x += indent # flip coordinate system y = @page.height - y - (@_font.ascender / 1000 * @_fontSize) # add current font to page if necessary @page.fonts[@_font.id] ?= @_font.ref # tell the font subset to use the characters @_font.use text # encode the text based on the font subset, # and then convert it to hex text = @_font.encode text text = (text.charCodeAt(i).toString(16) for i in [0...text.length]).join('') # begin the text object @addContent "BT" # text position @addContent "#{x} #{y} Td" # font and font size @addContent "/#{@_font.id} #{@_fontSize} Tf" # rendering mode mode = if options.fill and options.stroke then 2 else if options.stroke then 1 else 0 @addContent "#{mode} Tr" unless mode is state.mode # Word spacing @addContent wordSpacing + ' Tw' unless wordSpacing is state.wordSpacing # Character spacing @addContent characterSpacing + ' Tc' unless characterSpacing is state.characterSpacing # add the actual text @addContent "<#{text}> Tj" # end the text object @addContent "ET" # keep track of text states state.mode = mode state.wordSpacing = wordSpacing _wrap: (text, options) -> wrap = @_wrapState width = @widthOfString.bind this indent = options.indent or 0 lineWidth = (options.width - (options.columnGap * (options.columns - 1))) / options.columns # initial settings wrap.column = 1 # the current column wrap.startY = @y # the initial Y position wrap.lineWidth = lineWidth # the maximum width of each line wrap.firstLine = true # whether we are on the first line of a paragraph wrap.lastLine = false # whether we are on the last line of a paragraph # calculate the maximum Y position the text can appear at wrap.maxY = @y + options.height - @currentLineHeight() # split the line into words words = text.match(WORD_RE) # calculate the extra width wrap.extraSpace = (options.wordSpacing or 0) * (words.length - 1) + # wordSpacing (options.characterSpacing or 0) * (text.length - 1) # characterSpacing # space left on the line to fill with words spaceLeft = lineWidth - indent - wrap.extraSpace # word width cache wordWidths = {} len = words.length buffer = '' for word, i in words w = wordWidths[word] ?= width(word) if w > spaceLeft or word is '\n' # keep track of the wrapping state if wrap.lastLine wrap.firstLine = true wrap.lastLine = false # if we've got a newline, mark it if word is '\n' wrap.lastLine = true w += indent # render the line lastLine = buffer.trim() @_line lastLine, options # we're no longer on the first line... wrap.firstLine = false # if we've reached the maximum height, make sure # that the first line of a paragraph is never by # itself at the bottom of a page nextY = @y + @currentLineHeight(true) if @y > wrap.maxY or (wrap.lastLine and nextY > wrap.maxY) # if we've reached the edge of the page, # continue on a new page or column @_nextSection options # reset the space left and buffer spaceLeft = lineWidth - w - wrap.extraSpace buffer = if word is '\n' then '' else word else # add the word to the buffer spaceLeft -= w buffer += word # add the last line wrap.lastLine = true @_line buffer.trim(), options # reset wrap state @_wrapState = {} _nextSection: (options) -> wrap = @_wrapState if ++wrap.column > options.columns @addPage() wrap.column = 1 wrap.startY = @page.margins.top wrap.maxY = @page.maxY() else @x += wrap.lineWidth + options.columnGap @y = wrap.startY