inja2web2py.py

"""                                                                                                           
Usage:                                                                                                        
                                                                                                              
    python jinja2web2py.py jinjatemplate.html > web2pytemplate.html                                           
                                                                                                              
Disclaimer. It is not perfect. Some times minor manual tweaks may be necessary.                               
Notice the web2py template language was invented in 2007 and consists of pure Python code.                    
The opposite conversion is not possible because Python code cannot be converted to a jinja template.          
"""
import sys
import re

codee = re.compile('\{\{(.*?)\|\s*e\s*\%\}',re.DOTALL)
codeprint = re.compile('\{\{(.*?)\}\}',re.DOTALL)
extends = re.compile('\{\%\s*extends\s+(.*?)\%\}',re.DOTALL)
endblock = re.compile('\{\%\s*endblock\s+(.*?)\%\}',re.DOTALL)
macro = re.compile('\{\%\s*macro\s+(.*?)\%\}',re.DOTALL)
endmacro = re.compile('\{\%\s*endmacro\s+(.*?)\%\}',re.DOTALL)
endif = re.compile('\{\%\s*endif\s*\%\}',re.DOTALL)
endfor = re.compile('\{\%\s*endfor\s*\%\}',re.DOTALL)
refor_sort = re.compile('\{\%\s*for\s+(.*?)\s+in\s+(.*?)\s*\|\s*sort\s*\%\}',re.DOTALL)
reif = re.compile('\{\%\s*(for .*?|if .*?|elif .*?|else)\s*\%\}',re.DOTALL)
code = re.compile('\{\%(.*?)\%\}',re.DOTALL)

def convert(data):
    data = codee.sub('{{=\g<1>}}',data) # web2py always escapes by default                                    
    data = codeprint.sub('{{=\g<1>}}',data)
    data = extends.sub('{{ extends \g<1>}}',data)
    data = endblock.sub('{{ end }}', data)
    data = macro.sub('{{ def g<1>: }}',data) # web2py invented this, not jinja                                
    data = endmacro.sub('{{ return }}',data)
    data = endif.sub('{{ pass }}',data)
    data = endfor.sub('{{ pass }}',data)
    data = refor_sort.sub('{{ for \g<1> in sorted(\g<2>): }}', data)
    data = reif.sub('{{ \g<1>: }}', data)
    data = code.sub('{{\g<1>}}',data)
    return data

print convert(open(sys.argv[1]).read())