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)
