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parsers.py
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parsers.py
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#!/usr/bin/env python
#
import webapp2
import re
from google.appengine.ext import db
from google.appengine.ext import blobstore
from google.appengine.ext.webapp import blobstore_handlers
import xml.etree.ElementTree as ET
import logging
import api
def MakeParserOfType (format, webapp):
if (format == 'mcf') :
return MCFParser(webapp)
elif (format == 'rdfa') :
return RDFAParser(webapp)
else :
return 0
class ParseExampleFile :
def __init__ (self, webapp, layer=""):
logging.basicConfig(level=logging.INFO) # dev_appserver.py --log_level debug .
self.webapp = webapp
self.layer = layer
self.initFields()
def initFields(self):
self.currentStr = []
self.terms = []
self.egmeta = {}
self.egmeta["layer"] = self.layer
self.preMarkupStr = ""
self.microdataStr = ""
self.rdfaStr = ""
self.jsonStr = ""
self.state= ""
def nextPart(self, next):
if (self.state == 'PRE-MARKUP:'):
self.preMarkupStr = "".join(self.currentStr)
elif (self.state == 'MICRODATA:'):
self.microdataStr = "".join(self.currentStr)
elif (self.state == 'RDFA:'):
self.rdfaStr = "".join(self.currentStr)
elif (self.state == 'JSON:'):
self.jsonStr = "".join(self.currentStr)
self.state = next
self.currentStr = []
def process_example_id(self, m):
self.egmeta["id"] = m.group(1)
#logging.debug("Storing ID: %s" % self.egmeta["id"] )
return ''
def parse (self, contents):
content = ""
egid = re.compile("""#(\S+)\s+""")
for i in range(len(contents)):
content += contents[i]
lines = re.split('\n|\r', content)
for line in lines:
# Per-example sections begin with e.g.: 'TYPES: #music-2 Person, MusicComposition, Organization'
if ((len(line) > 6) and line[:6] == "TYPES:"):
self.nextPart('TYPES:')
#logging.debug("About to call api.Example.AddExample with terms: %s " % "".join( [" ; %s " % t.id for t in self.terms] ) )
api.Example.AddExample(self.terms, self.preMarkupStr, self.microdataStr, self.rdfaStr, self.jsonStr, self.egmeta)
self.initFields()
typelist = re.split(':', line)
#logging.debug("TYPE INFO: '%s' " % line );
tdata = egid.sub(self.process_example_id, typelist[1]) # strips IDs, records them in egmeta["id"]
ttl = tdata.split(',')
for ttli in ttl:
ttli = re.sub(' ', '', ttli)
#logging.debug("TTLI: %s " % ttli); # danbri tmp
self.terms.append(ttli)
else:
tokens = ["PRE-MARKUP:", "MICRODATA:", "RDFA:", "JSON:"]
for tk in tokens:
ltk = len(tk)
if (len(line) > ltk-1 and line[:ltk] == tk):
self.nextPart(tk)
line = line[ltk:]
if (len(line) > 0):
self.currentStr.append(line + "\n")
self.nextPart('TYPES:') # should flush on each block of examples
api.Example.AddExample(self.terms, self.preMarkupStr, self.microdataStr, self.rdfaStr, self.jsonStr, self.egmeta) # should flush last one
#logging.info("Final AddExample called with terms %s " % self.terms)
class UsageFileParser:
def __init__ (self, webapp):
self.webapp = webapp
def parse (self, contents):
lines = contents.split('\n')
for l in lines:
parts = l.split('\t')
if (len(parts) == 2):
unitstr = parts[0].strip()
count = parts[1]
api.StoreUsage(unitstr, count)
class RDFAParser :
def __init__ (self, webapp):
self.webapp = webapp
def parse (self, files, layer="core"):
self.items = {}
root = []
for i in range(len(files)):
logging.debug("RDFa parse schemas in %s " % files[i])
parser = ET.XMLParser(encoding="utf-8")
tree = ET.parse(files[i], parser=parser)
root.append(tree.getroot())
pre = root[i].findall(".//*[@prefix]")
for e in range(len(pre)):
api.Unit.storePrefix(pre[e].get('prefix'))
for i in range(len(root)):
self.extractTriples(root[i], None, layer)
return self.items.keys()
def stripID (self, str) :
if (len(str) > 16 and (str[:17] == 'http://schema.org')) :
return str[18:]
else:
return str
def extractTriples(self, elem, currentNode, layer="core"):
typeof = elem.get('typeof')
resource = elem.get('resource')
href = elem.get('href')
property = elem.get('property')
text = elem.text
if (property != None):
# if property == "rdf:type":
# property = "typeOf" # some crude normalization, since we aren't a real rdfa parser.
# logging.info("normalized rdf:type to typeOf internally. value is: %s" % href )
property = api.Unit.GetUnit(self.stripID(property), True)
if (href != None) :
href = api.Unit.GetUnit(self.stripID(href), True)
# self.webapp.write("<br>%s %s %s" % (currentNode, property, href))
api.Triple.AddTriple(currentNode, property, href, layer)
self.items[currentNode] = 1
elif (text != None):
# logging.info("<br>%s %s '%s'" % (currentNode, property, text))
api.Triple.AddTripleText(currentNode, property, text, layer)
self.items[currentNode] = 1
if (resource != None):
currentNode = api.Unit.GetUnit(self.stripID(resource), True)
if (typeof != None):
for some_type in typeof.split():
# logging.debug("rdfa typeOf: %s" % some_type)
api.Triple.AddTriple(currentNode, api.Unit.GetUnit("typeOf", True), api.Unit.GetUnit(self.stripID(some_type), True), layer)
for child in elem.findall('*'):
self.extractTriples(child, currentNode, layer)
class MCFParser:
def __init__ (self, webapp):
self.webapp = webapp
def extractUnitName (self, line):
parts = re.split(':', line)
name = parts[1]
return re.sub(' ', '', name)
def extractPredicateName (self, line):
parts = re.split(':', line)
return parts[0]
def cleanValue (self, value) :
if (value.find('"') > -1):
parts = re.split('"', value)
return parts[1]
else:
return re.sub(' ', '', value)
def extractValues (self, line):
parts = re.split(':', line)
raw_values = re.split(',', parts[1])
values = []
for rv in raw_values:
values.append(self.cleanValue(rv))
return values
def parse (self, content):
self.items = {}
lines = re.split('\n|\r', content)
unit = None
for l in lines:
# self.webapp.write("Got line" + l)
if (len(l) > 5 and (l[:5] == "Unit:")) :
unit = api.Unit.GetUnit(self.extractUnitName(l), True)
self.items[unit] = 1
# self.webapp.write("Got unit:" + unit)
elif (len(l) > 1 and (l.find(':') > 1)) :
predicate = apiUnit.GetUnit(self.extractPredicateName(l), True)
values = self.extractValues(l)
# self.webapp.write("<br>Got predicate " + predicate)
for v in values:
api.Triple.AddTriple(unit, predicate, api.Unit.GetUnit(v, True))
return self.items.keys()