def parse():
""" Parse a command and return a json string.
If parse is successful, returns a tuple (true, [instructions]).
If parse is not successful, returns a tuple (false, [errors]).
"""
status = False
data = {}
errors = []
command = request.forms.get('command')
# preprocess
tokens = preprocess(command)
# Make a local copy of productions
lproductions = list(productions)
# find all integers
ints = set(filter(RE_INT.match, tokens))
# Add a production for every integer
lproductions.extend(map(num_production, ints))
# Make a local copy of the grammar with extra productions
lgrammar = FeatureGrammar(grammar.start(), lproductions)
# Load grammar into a parser
parser = FeatureEarleyChartParser(lgrammar, trace=0)
try:
trees = parser.nbest_parse(tokens)
if not trees:
errors = ['I could not parse this sentence.']
elif len(trees) > 1:
errors = ['This sentence had multiple interpretations.']
else:
status = True
try:
# Setup session for history
session = bottle.request.environ.get('beaker.session')
history.history = session.get('history', [])
session['history'] = history.history
commands = eval(str(trees[0].node['SEM']), draw.functions)
data = {
'sentence': request.forms.get('command'),
'tree': trees[0],
# Eval semantics in draw namespace
'actions': commands,
}
except AssertionError as e:
status = False
errors = ['I got the following semantic error: <br /><pre>' + str(e) + '</pre>']
except ValueError as e:
status = False
errors = ['I got the following error: <br /><pre>' + str(e) + '</pre>']
return {'status':status, 'errors':errors, 'data':data}
def parse(self, command):
tokens = preprocess(command)
ints = set(filter(RE_INT.match, tokens))
lproductions = list(grammar.productions())
# Add a production for every integer
lproductions.extend(map(num_production, ints))
# Make a local copy of the grammar with extra productions
lgrammar = FeatureGrammar(type(self).start, lproductions)
# Load grammar into a parser
parser = FeatureEarleyChartParser(lgrammar, trace=0)
return parser.nbest_parse(tokens)
