Automate the insertion of text into a file.

jrobertson (James Robertson) — Wed, 23 Jan 2008 15:19:09 GMT

This example updates an xsl file with a new xsl:include declaration, and with a javascript header declaration. It reads 'guide.xsl' as a text file, and reads the template 'guide_ptemplate.xml' as a rexml document.



#!/usr/bin/ruby

#file: create add2guide_xsl.rb



require 'rexml/document'

include REXML



class Add2GuideTxt

  def initialize

    @guide = 'guide.xsl'

    @guide_template = 'guide_ptemplate.xml'

  end

  

  def insertText(project)

    # read guide.txt and return the buffer

    buffer = readGuide(@guide)    

    replaceBuffer(project, buffer, @guide) if not buffer.match("")

  end

  

  def replaceBuffer(project, buffer, output_file)

    # read guide_ptemplate.xsl and return the doc

    doc = readGuideTemplate(@guide_template)    

    # read the xsl:include

    xsl_include = buildIncludeTemplate(project, doc)

    # read the xsl:if

    xsl_if = buildIfTemplate(project,doc)

    

    eoi = ""

    buffer = buffer.gsub(eoi, "#{xsl_include}\n" + eoi)

    eoj = ""

    buffer = buffer.gsub(eoj, "\n#{xsl_if}\n" + eoj)

    

    file = File.new(output_file,'w')

    file.puts buffer.gsub(""","'")

    file.close

  end

  

  def buildIncludeTemplate(project, doc)

    xsl_include = doc.root.elements['xsl:include']

    xsl_include.attributes['href'] = '/xsl/' + project + '.xsl'

    xsl_include

  end

  

  def buildIfTemplate(project, doc)

    xsl_if = doc.root.elements['xsl:if']

    xsl_if.attributes['test'] = project

    xsl_if.elements['script[3]'].text = 'const ProjectX = "' + project + '";'

    xsl_if

  end

  

  def readGuide(filename) 

    file = File.new(filename,'r')

    buffer = file.read

    file.close

    buffer

  end

  

  def readGuideTemplate(filename) 

    file = File.new(filename)

    Document.new(file)

  end

  

end



if __FILE__ == $0

  a2g = Add2GuideTxt.new

  #add the new project to the guide.xsl file  

  a2g.insertText('tasks')

end

file: guide.xsl (target file)

...

file: guide_ptemplate.xml (template used to insert blocks of code into guide.xsl)

DZone Snippets: gsub code

Automate the insertion of text into a file.