#! /usr/bin/python 
"""\

string <-> time built-ins for cwm

See cwm.py
"""

import thing
import notation3    # N3 parsers and generators, and RDF generator
from thing import *

import time, timegm


TIME_NS_URI = "http://www.mnot.net/2002/02/25/time#"
__version__ = "0.1"

class BI_format(LightBuiltIn, Function):
    def evaluateObject(self, store, context, subj, subj_py):
        if thing.verbosity() > 80: progress("strTime:format input:"+`subj_py`)
        str, format = subj_py
        try:
            return store._fromPython(context, 
              time.strftime(format, time.gmtime(int(str))))
        except:
            return None

class BI_parse(LightBuiltIn, Function):
    def evaluateObject(self, store, context, subj, subj_py):
        if thing.verbosity() > 80: progress("strTime:parse input:"+`subj_py`)
        str, format = subj_py
        try:
            return store._fromPython(context, 
              timegm.timegm(time.strptime(str, format)))
        except:
            return None

            
def register(store):
    t = store.internURI(TIME_NS_URI[:-1])
    t.internFrag("format", BI_format)
    t.internFrag("parse", BI_parse)