from semantics import statements

# namespaces
skos = 'http://www.w3.org/2008/05/skos#'
owl = 'http://www.w3.org/2002/07/owl#'
rdf = 'http://www.w3.org/1999/02/22-rdf-syntax-ns#'
rdfs = 'http://www.w3.org/2000/01/rdf-schema#'

# text params
delimiter = '\t'
linebreak = '\n'
comment = '#'

def abbreviate(node):
    """
    Attempt to abbreviate URIs using namespace prefixes.
    """
    abbreviation = str(node)
    abbreviation = abbreviation.replace(skos, 'skos:')
    abbreviation = abbreviation.replace(owl, 'owl:')
    abbreviation = abbreviation.replace(rdf, 'rdf:')
    abbreviation = abbreviation.replace(rdfs, 'rdfs:')
    return abbreviation

def render(triple):
    """
    Render a triple as a string.
    """
    line = abbreviate(triple[0]) + delimiter + abbreviate(triple[1]) + delimiter + abbreviate(triple[2]) + linebreak
    return line

# open file for text output
outfile = open('triples.txt', 'w')
    
# write out triples to file
count = 1
for statement in statements():
    outfile.write(comment+'S'+str(count)+linebreak) # comment out this line to remove statement numbers from output
    for triple in statement:
        outfile.write(render(triple))
    count = count + 1