def execute(arguments):
# Setup the configuration file.
config = arguments.get('--config-file', None) or os.path.join(
'example', 'config.json')
with open(config) as config_file:
config = json.load(config_file)
# Setup the schema.
schema = arguments.get('--schema-file', None) or os.path.join(
'example', 'schema.json')
with open(schema) as schema_file:
schema = json.load(schema_file)
# Get the input string.
ra_string = arguments.get('<input>')
rapt_instance = Rapt(**config)
try:
if arguments.get('sql'):
print(to_sql(rapt_instance, ra_string, schema))
elif arguments.get('qtree'):
print(to_qtree(rapt_instance, ra_string, schema))
elif arguments.get('pdf'):
qtree = to_qtree(rapt_instance, ra_string, schema)
qtree_to_pdf(qtree)
print(qtree)
elif arguments.get('seq'):
print(to_sequence(rapt_instance, ra_string, schema))
elif arguments.get('repl'):
print(to_repl(rapt_instance, schema, config))
except Exception as err:
print('Error: {}'.format(err))
def do_draw(self, line):
"""
Draw the syntax tree of the most recently executed relational algebra
statement.
Requires pdflatex.
The files created during the pdf generation process are prefixed with
'out' (e.g. out.pdf). Optionally, a filename (without extension) can
be provided instead.
Usage: draw [filename]
"""
if self.previous is not None:
args = shlex.split(line)
if len(args) == 1:
qtree = ''.join(self.rapt.to_qtree(self.previous, self.schema))
qtree_to_pdf(qtree, args[0])
