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, '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 = Exscript.interpreter.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 = Exscript.interpreter.Code.Code(lexer, parser, parent)
class IfCondition(Token):
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 = Exscript.interpreter.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 = Exscript.interpreter.Code.Code(lexer, parser, parent)
def value(self, context):
if self.expression.value(context)[0]:
self.if_block.value(context)
elif self.else_block is not None:
self.else_block.value(context)
return 1
def dump(self, indent = 0):
print((' ' * indent) + self.name, 'start')
self.expression.dump(indent + 1)
self.if_block.dump(indent + 1)
if self.else_block is not None:
self.else_block.dump(indent + 1)
print((' ' * indent) + self.name, 'end.')
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, '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'])
class IfCondition(Token):
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 value(self, context):
if self.expression.value(context)[0]:
self.if_block.value(context)
elif self.else_block is not None:
self.else_block.value(context)
return 1
def dump(self, indent=0):
print(' ' * indent) + self.name, 'start'
self.expression.dump(indent + 1)
self.if_block.dump(indent + 1)
if self.else_block is not None:
self.else_block.dump(indent + 1)
print(' ' * indent) + self.name, 'end.'
class Fail(Token):
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 value(self, context):
if self.expression is None or self.expression.value(context)[0]:
raise FailException(self.msg.value(context)[0])
return 1
def dump(self, indent=0):
print(' ' * indent) + self.name, 'start'
self.msg.dump(indent + 1)
self.expression.dump(indent + 1)
print(' ' * indent) + self.name, 'end.'
class Fail(Token):
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 value(self, context):
if self.expression is None or self.expression.value(context)[0]:
raise FailException(self.msg.value(context)[0])
return 1
def dump(self, indent = 0):
print((' ' * indent) + self.name, 'start')
self.msg.dump(indent + 1)
self.expression.dump(indent + 1)
print((' ' * indent) + self.name, 'end.')
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)
class Loop(Token):
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)
def value(self, context):
if len(self.list_variables) == 0 and not self.thefrom:
# If this is a "while" loop, iterate as long as the condition is True.
if self.during is not None:
while self.during.value(context)[0]:
self.block.value(context)
return 1
# If this is an "until" loop, iterate until the condition is True.
if self.until is not None:
while not self.until.value(context)[0]:
self.block.value(context)
return 1
# Retrieve the lists from the list terms.
if self.thefrom:
start = self.thefrom.value(context)[0]
stop = self.theto.value(context)[0]
lists = [range(start, stop)]
else:
lists = [var.value(context) for var in self.list_variables]
vars = self.iter_varnames
# Make sure that all lists have the same length.
for list in lists:
if len(list) != len(lists[0]):
msg = 'All list variables must have the same length'
self.lexer.runtime_error(msg, self)
# Iterate.
for i in xrange(len(lists[0])):
f = 0
for list in lists:
self.block.define(**{vars[f]: [list[i]]})
f += 1
if self.until is not None and self.until.value(context)[0]:
break
if self.during is not None and not self.during.value(context)[0]:
break
self.block.value(context)
return 1
def dump(self, indent = 0):
print (' ' * indent) + self.name,
print self.list_variables, 'as', self.iter_varnames, 'start'
if self.during is not None:
self.during.dump(indent + 1)
if self.until is not None:
self.until.dump(indent + 1)
self.block.dump(indent + 1)
print (' ' * indent) + self.name, 'end.'
