def __init__(self, lexer, parser, parent): Token.__init__(self, 'If-condition', lexer, parser, parent) # Expect an expression. lexer.expect(self, 'keyword', 'if') lexer.expect(self, 'whitespace') self.expression = Expression(lexer, parser, parent) self.mark_end() # Body of the if block. self.if_block = Code.Code(lexer, parser, parent) self.elif_blocks = [] self.else_block = None # If there is no "else" statement, just return. lexer.skip(['whitespace', 'newline']) if not lexer.next_if('keyword', 'else'): return # If the "else" statement is followed by an "if" (=elif), # read the next if condition recursively and return. lexer.skip(['whitespace', 'newline']) if lexer.current_is('keyword', 'if'): self.else_block = IfCondition(lexer, parser, parent) return # There was no "elif", so we handle a normal "else" condition here. self.else_block = Code.Code(lexer, parser, parent)
def __init__(self, lexer, parser, parent): Token.__init__(self, 'Fail', lexer, parser, parent) self.expression = None # "fail" keyword. lexer.expect(self, 'keyword', 'fail') lexer.expect(self, 'whitespace') self.msg = Expression(lexer, parser, parent) # 'If' keyword with an expression. #token = lexer.token() if lexer.next_if('keyword', 'if'): lexer.expect(self, 'whitespace') self.expression = Expression(lexer, parser, parent) # End of expression. self.mark_end() lexer.skip(['whitespace', 'newline'])
def __init__(self, lexer, parser, parent): Token.__init__(self, 'Loop', lexer, parser, parent) self.during = None self.until = None self.thefrom = None self.theto = None self.list_variables = [] self.iter_varnames = [] # Expect one ore more lists. lexer.expect(self, 'keyword', 'loop') lexer.expect(self, 'whitespace') if not lexer.current_is('keyword', 'while') and \ not lexer.current_is('keyword', 'until') and \ not lexer.current_is('keyword', 'from'): self.list_variables = [Term(lexer, parser, parent)] lexer.next_if('whitespace') while lexer.next_if('comma'): lexer.skip(['whitespace', 'newline']) self.list_variables.append(Term(lexer, parser, parent)) lexer.skip(['whitespace', 'newline']) # Expect the "as" keyword. lexer.expect(self, 'keyword', 'as') # The iterator variable. lexer.next_if('whitespace') _, iter_varname = lexer.token() lexer.expect(self, 'varname') parent.define(**{iter_varname: []}) self.iter_varnames = [iter_varname] lexer.next_if('whitespace') while lexer.next_if('comma'): lexer.skip(['whitespace', 'newline']) _, iter_varname = lexer.token() lexer.expect(self, 'varname') parent.define(**{iter_varname: []}) self.iter_varnames.append(iter_varname) lexer.skip(['whitespace', 'newline']) if len(self.iter_varnames) != len(self.list_variables): error = '%s lists, but only %s iterators in loop' % (len(self.iter_varnames), len(self.list_variables)) lexer.syntax_error(error, self) # Check if this is a "from ... to ..." loop. if lexer.next_if('keyword', 'from'): lexer.expect(self, 'whitespace') self.thefrom = Expression(lexer, parser, parent) lexer.next_if('whitespace') lexer.expect(self, 'keyword', 'to') self.theto = Expression(lexer, parser, parent) lexer.next_if('whitespace') if lexer.next_if('keyword', 'as'): lexer.next_if('whitespace') _, iter_varname = lexer.token() lexer.expect(self, 'varname') lexer.next_if('whitespace') else: iter_varname = 'counter' parent.define(**{iter_varname: []}) self.iter_varnames = [iter_varname] # Check if this is a "while" loop. if lexer.next_if('keyword', 'while'): lexer.expect(self, 'whitespace') self.during = Expression(lexer, parser, parent) lexer.next_if('whitespace') # Check if this is an "until" loop. if lexer.next_if('keyword', 'until'): lexer.expect(self, 'whitespace') self.until = Expression(lexer, parser, parent) lexer.next_if('whitespace') # End of statement. self.mark_end() # Body of the loop block. lexer.skip(['whitespace', 'newline']) self.block = Code.Code(lexer, parser, parent)