def raise_open_without_close(formula, stack):
"""
Called when un-closed opening brackets remain at the end of scan, for
example: "(1 + 2) + ( 3 + (".
- stack is the remaining stack
"""
bracket_registry = BracketValidator.bracket_registry
still_open = {}
for key in sorted(bracket_registry):
if bracket_registry[key].is_closer:
continue
num_opened = sum([entry.bracket.char == bracket_registry[key].char for entry in stack])
if num_opened:
still_open[key] = num_opened
# sort so error messages come in definite order, for testing purposes
sorted_still_open = sorted(still_open.keys(), key=lambda x: bracket_registry[x].name)
if still_open:
message = "Invalid Input:\n"
for key in sorted_still_open:
if still_open[key] == 1:
message += ('{count} {name} was opened without being closed '
'(highlighted below)\n'
.format(count=still_open[key], name=bracket_registry[key].name))
else:
message += ('{count} {plural} were opened without being closed '
'(highlighted below)\n'
.format(count=still_open[key], plural=bracket_registry[key].plural))
indices = [entry.index for entry in stack]
highlight = BracketValidator.highlight_formula(formula, indices)
message += highlight
raise UnbalancedBrackets(message)
def raise_close_without_open(formula, current):
"""
Called when scan encounters a closing bracket without matching opener,
for example: "1, 2, 3]".
- current is the offending StackEntry
"""
msg = ("Invalid Input: a {current.bracket.name} was closed without ever "
"being opened, highlighted below.\n{highlight}")
indices = [current.index]
highlight = BracketValidator.highlight_formula(formula, indices)
formatted = msg.format(current=current, highlight=highlight)
raise UnbalancedBrackets(formatted)
def raise_wrong_closing_bracket(formula, current, previous):
"""
Called when scan encounters a closing bracket that does not match the
previous opening bracket, for example: "[(1, 2, 3])"
- current and previous are the offending StackEntry pairs
"""
msg = ("Invalid Input: a {previous.bracket.name} was opened and then "
"closed by a {current.bracket.name}, highlighted below.\n"
"{highlight}")
indices = [previous.index, current.index]
highlight = BracketValidator.highlight_formula(formula, indices)
formatted = msg.format(current=current, previous=previous, highlight=highlight)
raise UnbalancedBrackets(formatted)