DZone Snippets: print code

Pretty Print XML using Ruby

jrobertson (James Robertson) — Mon, 07 Jan 2008 01:41:26 GMT

This code makes the XML output look pretty. I tried using the documentation from the REXML website to apply the method example doc.write($stdout,0), but I gave up, and instead wrote my own XML pretty-print method.



require 'rexml/document'

include REXML



  def pretty_print(parent_node, itab)

    buffer = ''



    parent_node.elements.each do |node|



      buffer += ' ' * itab + "<#{node.name}#{get_att_list(node)}"

  

      if node.to_a.length > 0

        buffer += ">"

        if node.text.nil?

          buffer += "\n"

          buffer += pretty_print(node,itab+2) 

          buffer += ' ' * itab + "\n"

        else

          node_text = node.text.strip

          if node_text != ''

            buffer += node_text 

            buffer += "\n"        

          else

            buffer += "\n" + pretty_print(node,itab+2) 

            buffer += ' ' * itab + "\n"        

          end

        end

      else

        buffer += "/>\n"

      end

      

    end

    buffer

  end



  def get_att_list(node)

    att_list = ''

    node.attributes.each { |attribute, val| att_list += " #{attribute}='#{val}'" }

    att_list

  end

  

  def pretty_xml(doc)

    buffer = ''

    xml_declaration = doc.to_s.match('<\?.*\?>').to_s

    buffer += "#{xml_declaration}\n" if not xml_declaration.nil?

    xml_doctype = doc.to_s.match('<\!.*\">').to_s

    buffer += "#{xml_doctype}\n" if not xml_doctype.nil?

    buffer += "<#{doc.root.name}#{get_att_list(doc.root)}"

    if doc.root.to_a.length > 0

      buffer +=">\n#{pretty_print(doc.root,2)}"

    else

      buffer += "/>\n"

    end

  end



xml_data = "Ruby"

doc = Document.new(xml_data)

pretty_xml(doc)

output
Ruby

*Update 7-Jan-08 1:51AM *
Although I haven't tried running the following XSL code, this might actually have been a better solution to my problem. source: http://www.printk.net/~bds/indent.html

*Pretty Print XML using XSLT*

Print Page Link

Hanek (Michael Watt) — Fri, 02 Nov 2007 01:35:51 GMT
// Print Page (link) code

print

Print a binary number in C

scvalex (Alexandru Scvortov) — Tue, 30 Oct 2007 11:53:18 GMT
These are two functions that print the binary representation of an integer. The first simply prints it out, while the second only prints out the relevant digits (i.e. cuts the first x 0 digits) in groups of four.

Explanation here.

#include /* Print n as a binary number */ void printbitssimple(int n) { unsigned int i; i = 1<<(sizeof(n) * 8 - 1); while (i > 0) { if (n & i) printf("1"); else printf("0"); i >>= 1; } } /* Print n as a binary number */ void printbits(int n) { unsigned int i, step; if (0 == n) { /* For simplicity's sake, I treat 0 as a special case*/ printf("0000"); return; } i = 1<<(sizeof(n) * 8 - 1); step = -1; /* Only print the relevant digits */ step >>= 4; /* In groups of 4 */ while (step >= n) { i >>= 4; step >>= 4; } /* At this point, i is the smallest power of two larger or equal to n */ while (i > 0) { if (n & i) printf("1"); else printf("0"); i >>= 1; } } int main(int argc, char *argv[]) { int i; for (i = 0; i < 16; ++i) { printf("%d = ", i); printbitssimple(i); printf("\n"); } return 0; }

[ASM]Write String only using BIOS

darktemplar (Piotr) — Tue, 12 Dec 2006 02:02:47 GMT
First, set starting address of text into DS:SI registers. Procedure writes text until null-character is met.
;-----------------------------------------------------------------------------; ; WRITE_STRING(DS:SI Text) ; ;-----------------------------------------------------------------------------; ; Writes string from DS:SI until character #0 is met ; Write_String: mov ah, 0xE xor bh, bh mov bl, 0x7 .nextchar lodsb or al,al jz .return int 10h jmp .nextchar .return ret

pretty tables for rails models

MattScilipoti (Matt Scilipoti) — Tue, 13 Jun 2006 01:56:27 GMT
From http://www.rubyinside.com/columnized-text-datasets-in-rails-71.html:
Inspired by: http://blog.caboo.se/articles/2006/06/10/pretty-tables-for-ruby-objects

It gives a MySQL-command-line-client style textual view of data stored in your Rails database. The syntax worked like this:
Something.find(:all, :conditions => â€˜whateverâ€˜).pretty_print

class Array protected def columnized_row(fields, sized) r = [] fields.each_with_index do |f, i| r << sprintf(â€?%0-#{sized[i]}sâ€œ, f.to_s.gsub(/\n|\r/, â€˜â€™).slice(0, sized[i])) end r.join(â€™ | â€˜) end public def columnized(options = {}) sized = {} self.each do |row| row.attributes.values.each_with_index do |value, i| sized[i] = [sized[i].to_i, row.attributes.keys[i].length, value.to_s.length].max sized[i] = [options[:max_width], sized[i].to_i].min if options[:max_width] end end table = [] table << header = columnized_row(self.first.attributes.keys, sized) table << header.gsub(/./, â€˜-â€˜) self.each { |row| table << columnized_row(row.attributes.values, sized) } table.join(â€?\nâ€œ) end end class ActiveRecord::Base def columnized(options = {}) [*self].columnized(options) end end

To use:
>> puts Post.find(:all).columnized(:max_width => 10) updated_at | title | private | url | thumb | metadata | movie | id | views | content | user_id | created_at â€”â€”â€”â€”â€”â€”â€”â€”â€”â€”â€”â€”â€”â€”â€”â€”â€”â€”â€”â€”â€”â€”â€”â€”â€”â€”â€”â€”â€”â€”â€”â€”â€”â€”â€”â€”â€”â€”â€”â€”â€”â€” Wed May 31 | tetwer | 0 | | | | | 909 | 0 | video:xyzz | 1 | Wed May 31 Wed May 31 | bbbb | 0 | | | | | 1 | 15 | // descrip | 1 | Tue May 23 Wed May 31 | cxzcxzx | 0 | | | | | 906 | 19 | // descrip | 1 | Tue May 23 Wed May 31 | jklklkl; | 0 | | | | | 907 | 35 | // descrip | 1 | Tue May 23

If you want to use it with your project, put the code into lib/columnized.rb, use require â€˜columnizedâ€™, and youâ€™re ready to roll. Unlike courtenayâ€™s version, mine only supports max_width, but I didnâ€™t consider changing the column separator too important.

print array in readable format

sneakysausage (Chris Hodgson) — Thu, 23 Feb 2006 02:51:02 GMT
// description of your code here

print("".print_r($_POST,true)."");

Print to a file

korakot (Korakot Chaovavanich) — Fri, 09 Dec 2005 14:00:09 GMT
To print to console, it's easy
print 'hello', 'world'
To print to an output file, it's similar
f = open('out.txt','w') print >>f, 'hello', 'world'