def parse_first_assignment(cls, assignment):
c_index, c = lineparse.find_first(
lambda current_char: current_char in (',', '='), assignment)
if c_index == -1: # If assignment / next variable not found
c_index = len(assignment)
variable_name = assignment[:c_index].strip()
if not variable_name.startswith('$'):
raise SyntaxError(
"Variable name must start in '$'! Variable: {variable}".format(
variable=variable_name))
# Initialized with an expression
if c == '=':
# Parse the expression
if len(assignment) == c_index:
raise SyntaxError("Empty Assignment Value")
exp_str = assignment[c_index + 1:]
exp_tree, exp_end = expressions.parse_expression(
exp_str, end_options=(',', ), allow_more=True)
variable_value = exp_tree
else:
variable_value = expnodes.ValueNode(value='')
exp_end = len(assignment)
return variable_name, variable_value, c_index + 1 + exp_end + 1
def get_operator(exp):
op_index, op = lineparse.find_first(lambda cur_op: exp.startswith(cur_op), all_operators)
if op_index == -1:
return None, op_index
if op in needs_space and exp[len(op):len(op)+1] != ' ':
raise SyntaxError("Operator {} needs space", op)
return op, len(op)
def get_name_end(exp):
if not exp:
raise SyntaxError("Empty variable name")
if exp[0] not in name_first_letter:
raise SyntaxError("First letter is invalid: {0}".format(exp[0]))
char_index, _ = lineparse.find_first(lambda char: char not in name_chars, exp)
if char_index == -1:
char_index = len(exp)
return char_index
def parse(cls, raw_lines, current_line):
start_line = current_line + 1
end_line, _ = lineparse.find_first(
func=lambda line: line.content in CommentsSectionDirective.
end_keywords,
seq=raw_lines,
start=start_line)
if end_line == -1:
raise SyntaxError("Missing #comments-end")
comment_section = '\n'.join(line.content
for line in raw_lines[start_line:end_line])
return CommentsSectionDirective(comment_section), end_line + 1
def get_precedence_level(operator):
index, _ = lineparse.find_first(lambda ops: operator in ops, operators_by_precedence)
return index