def remove_column_from_spec(self, attribute, remove_first: bool = False):
"""
Removes an attribute from the Vis's clause
Parameters
----------
attribute : str
attribute to be removed
remove_first : bool, optional
Boolean flag to determine whether to remove all instances of the attribute or only one (first) instance, by default False
"""
if (not remove_first):
new_inferred = list(
filter(lambda x: x.attribute != attribute,
self._inferred_intent))
self._inferred_intent = new_inferred
self._intent = new_inferred
elif (remove_first):
new_inferred = []
skip_check = False
for i in range(0, len(self._inferred_intent)):
if self._inferred_intent[
i].value == "": # clause is type attribute
column_spec = []
column_names = self._inferred_intent[i].attribute
# if only one variable in a column, columnName results in a string and not a list so
# you need to differentiate the cases
if isinstance(column_names, list):
for column in column_names:
if (column != attribute) or skip_check:
column_spec.append(column)
elif (remove_first):
remove_first = True
new_inferred.append(Clause(column_spec))
else:
if column_names != attribute or skip_check:
new_inferred.append(Clause(attribute=column_names))
elif (remove_first):
skip_check = True
else:
new_inferred.append(self._inferred_intent[i])
self._intent = new_inferred
self._inferred_intent = new_inferred
def parse(intent: List[Union[Clause, str]]) -> List[Clause]:
"""
Given the string description from a list of input Clauses (intent),
assign the appropriate clause.attribute, clause.filter_op, and clause.value.
Parameters
----------
intent : List[Clause]
Underspecified list of lux.Clause objects.
Returns
-------
List[Clause]
Parsed list of lux.Clause objects.
"""
if type(intent) != list:
raise TypeError(
"Input intent must be a list consisting of string descriptions or lux.Clause objects."
"\nSee more at: https://lux-api.readthedocs.io/en/latest/source/guide/intent.html"
)
import re
# intent = ldf.get_context()
new_context = []
#checks for and converts users' string inputs into lux specifications
for clause in intent:
valid_values = []
if isinstance(clause, list):
valid_values = []
for v in clause:
if type(
v
) is str: # and v in list(ldf.columns): #TODO: Move validation check to Validator
valid_values.append(v)
temp_spec = Clause(attribute=valid_values)
new_context.append(temp_spec)
elif isinstance(clause, str):
#case where user specifies a filter
if "=" in clause:
eqInd = clause.index("=")
var = clause[0:eqInd]
if "|" in clause:
values = clause[eqInd + 1:].split("|")
for v in values:
# if v in ldf.unique_values[var]: #TODO: Move validation check to Validator
valid_values.append(v)
else:
valid_values = clause[eqInd + 1:]
# if var in list(ldf.columns): #TODO: Move validation check to Validator
temp_spec = Clause(attribute=var,
filter_op="=",
value=valid_values)
new_context.append(temp_spec)
#case where user specifies a variable
else:
if "|" in clause:
values = clause.split("|")
for v in values:
# if v in list(ldf.columns): #TODO: Move validation check to Validator
valid_values.append(v)
else:
valid_values = clause
temp_spec = Clause(attribute=valid_values)
new_context.append(temp_spec)
elif type(clause) is Clause:
new_context.append(clause)
intent = new_context
# ldf._intent = new_context
for clause in intent:
if (clause.description):
#TODO: Move validation check to Validator
#if ((clause.description in list(ldf.columns)) or clause.description == "?"):# if clause.description in the list of attributes
if any(ext in [">", "<", "=", "!="]
for ext in clause.description
): # clause.description contain ">","<". or "="
# then parse it and assign to clause.attribute, clause.filter_op, clause.values
clause.filter_op = re.findall(r'/.*/|>|=|<|>=|<=|!=',
clause.description)[0]
split_description = clause.description.split(
clause.filter_op)
clause.attribute = split_description[0]
clause.value = split_description[1]
if re.match(r'^-?\d+(?:\.\d+)?$', clause.value):
clause.value = float(clause.value)
elif (type(clause.description) == str):
clause.attribute = clause.description
elif (type(clause.description) == list):
clause.attribute = clause.description
# else: # then it is probably a value
# clause.values = clause.description
return intent
# ldf._intent = intent