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environment.py
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from value import Value
from variable import Variable
from step import Step
from object import Object
from method import Method, MethodSet
class Environment():
def __init__(self, upper, variables):
self.upper = upper
self.vars = variables
def copy(self):
variables = {}
for k in self.vars:
variables[k] = self.vars[k]
return Environment(self.upper, variables)
def define(self, var):
if type(var) == Step and var.action == 'dot':
parent = self[var.var0]
if type(parent) == Environment:
parent.define(var.arg)
else:
try:
parent.env[Variable('this')].define(var.arg)
except UnboundLocalError:
parent.env.define(var.arg)
elif var not in self.vars:
self.vars[var] = Value(None, var.type)
else:
raise NameError("Variable " + str(var) + " already defined in scope")
def __setitem__(self, var, val):
if type(var) == Step and var.action == 'dot':
parent = self[var.var0]
if isinstance(parent, Environment):
parent[var.arg] = val
else:
try:
parent.env[Variable('this')][var.arg] = val
except UnboundLocalError:
parent.env[var.arg] = val
elif self.contains(var, False):
if var.final and self.vars[var] != Value(None, "Object"):
raise TypeError(f"Cannot modify final variable {var.name}")
self.vars[var] = val
elif self.upper is not None:
self.upper[var] = val
else:
raise UnboundLocalError(f"Variable {var.name if type(var) == Variable else str(var)} is not defined in scope")
def __getitem__(self, args):
if type(args) == tuple:
var, params = args[0], args[1]
else:
var, params = args, None
if type(var) == Step and var.action == 'dot':
parent = self[var.var0]
if isinstance(parent, Environment):
return parent[var.arg]
else:
try:
return parent.env[Variable('this')][var.arg]
except UnboundLocalError:
return parent.env[var.arg]
elif self.contains(var, False):
if params is not None:
try:
return self.vars[var][var, params]
except Exception:
pass
else:
return self.vars[var]
if self.upper is not None:
return self.upper[var, params]
else:
if var in javascope:
if params is not None and isinstance(javascope[var], Object):
return javascope[var][var][var, params]
elif params is not None:
return javascope[var][var, params]
return javascope[var]
raise UnboundLocalError(f"Variable {var} not found")
def contains(self, item, checkupper=True):
if item in self.vars:
return True
if checkupper and self.upper is not None:
return self.upper.contains(item)
return False
def __iter__(self):
return self.vars.__iter__()
def __str__(self):
s = "{"
if self.upper is not None:
u = str(self.upper)
for line in u.split("\n"):
s += "\n " + line
for var in self.vars:
s += "\n " + str(var) + " = " + ("Environment" if type(self.vars[var]) == Environment else str(self.vars[var]))
return s + "\n}"
javascope = {
Variable('System', 'Object', True, True): Object(
name='System',
env=Environment(None, {
Variable('out', 'Object', True, True): Object(
name='out',
env=Environment(None, {
Variable('println', 'void', True, True): MethodSet(Variable('println', 'void')).add(
Method(
Variable('println', 'void', True, True),
[
Variable('val', 'Object')
],
[
Step('print', Variable('val'))
],
True
)
)
})
)
})
),
Variable('Integer', 'Object', True, True): Object(
name='Integer',
env=Environment(None, {
Variable('Integer', 'Integer', True, True): MethodSet(Variable('Integer', 'Integer', True, True)).add(
Method(
Variable('Integer', 'Integer', True, True),
[
Variable('inner', 'int')
],
[
Step('def', Step('dot', Variable('this', 'Integer'), Variable('inner', 'int'))),
Step('set', Step('dot', Variable('this', 'Integer'), Variable('inner', 'int')), Variable('inner', 'int'))
]
)
),
Variable('parseInt', 'int', True, True): MethodSet(Variable('parseInt', 'int', True, True)).add(
Method(
Variable('parseInt', 'int', True, True),
[
Variable('val', 'Object')
],
[
Step('return', Step('cast', Variable('val', 'Object'), 'int'))
]
)
),
Variable('toString', 'String', True, True): MethodSet(Variable('toString', 'String', True, True)).add(
Method(
Variable('toString', 'String', True, True),
[],
[
Step('return', Step('cast', Variable('inner', 'int'), 'String'))
]
)
)
})
),
Variable('Double', 'Object', True, True): Object(
name='Double',
env=Environment(None, {
Variable('Double', 'Double', True, True): MethodSet(Variable('Double', 'Double', True, True)).add(
Method(
Variable('Double', 'Double', True, True),
[
Variable('inner', 'double')
],
[
Step('def', Step('dot', Variable('this', 'Double'), Variable('inner', 'double'))),
Step('set', Step('dot', Variable('this', 'Double'), Variable('inner', 'double')), Variable('inner', 'double'))
]
)
),
Variable('parseDouble', 'double', True, True): MethodSet(Variable('parseDouble', 'double', True, True)).add(
Method(
Variable('parseDouble', 'double', True, True),
[
Variable('val', 'Object')
],
[
Step('return', Step('cast', Variable('val', 'Object'), 'double'))
]
)
),
Variable('toString', 'String', True, True): MethodSet(Variable('toString', 'String', True, True)).add(
Method(
Variable('toString', 'String', True, True),
[],
[
Step('return', Step('cast', Variable('inner', 'double'), 'String'))
]
)
)
})
),
Variable('Boolean', 'Object', True, True): Object(
name='Boolean',
env=Environment(None, {
Variable('Boolean', 'Boolean', True, True): MethodSet(Variable('Boolean', 'Boolean', True, True)).add(
Method(
Variable('Boolean', 'Boolean', True, True),
[
Variable('inner', 'boolean')
],
[
Step('def', Step('dot', Variable('this', 'Boolean'), Variable('inner', 'boolean'))),
Step('set', Step('dot', Variable('this', 'Boolean'), Variable('inner', 'boolean')), Variable('inner', 'boolean'))
]
)
),
Variable('parseBoolean', 'boolean', True, True): MethodSet(Variable('parseBoolean', 'boolean', True, True)).add(
Method(
Variable('parseBoolean', 'boolean', True, True),
[
Variable('val', 'Object')
],
[
Step('return', Step('cast', Variable('val', 'Object'), 'boolean'))
]
)
),
Variable('toString', 'String', True, True): MethodSet(Variable('toString', 'String', True, True)).add(
Method(
Variable('toString', 'String', True, True),
[],
[
Step('return', Step('cast', Variable('inner', 'boolean'), 'String'))
]
)
)
})
),
Variable('Character', 'Object', True, True): Object(
name='Character',
env=Environment(None, {
Variable('Character', 'Character', True, True): MethodSet(Variable('Character', 'Character', True, True)).add(
Method(
Variable('Character', 'Character', True, True),
[
Variable('inner', 'char')
],
[
Step('def', Step('dot', Variable('this', 'Character'), Variable('inner', 'char'))),
Step('set', Step('dot', Variable('this', 'Character'), Variable('inner', 'char')), Variable('inner', 'char'))
]
)
),
Variable('toString', 'String', True, True): MethodSet(Variable('toString', 'String', True, True)).add(
Method(
Variable('toString', 'String', True, True),
[],
[
Step('return', Step('cast', Variable('inner', 'char'), 'String'))
]
)
)
})
),
Variable('String', 'Object', True, True): Object(
name='String',
env=Environment(None, {
Variable('String', 'String', True, True): MethodSet(Variable('String', 'String', True, True)).add(
Method(
Variable('String', 'String', True, True),
[
Variable('inner', 'String')
],
[
Step('def', Step('dot', Variable('this', 'String'), Variable('inner', 'String'))),
Step('set', Step('dot', Variable('this', 'String'), Variable('inner', 'String')), Variable('inner', 'String'))
]
)
),
Variable('charAt', 'char', False, True): MethodSet(Variable('charAt', 'char', False, True)).add(
Method(
Variable('charAt', 'char', False, True),
[
Variable('index', 'int')
],
[
Step('return', Step('substring', Variable('inner', 'String'), Variable('index', 'int'), Step('eval', Variable('index', 'int'), '+', Value(1, 'int'))))
]
)
),
Variable('substring', 'String', False, True): MethodSet(Variable('substring', 'String', False, True)).add(
Method(
Variable('substring', 'String', False, True),
[
Variable('start', 'int')
],
[
Step('return', Step('substring', Variable('inner', 'String'), Variable('start', 'int'), Step('length', Variable('inner', 'String'))))
]
),
Method(
Variable('substring', 'String', False, True),
[
Variable('start', 'int'),
Variable('end', 'int')
],
[
Step('return', Step('substring', Variable('inner', 'String'), Variable('start', 'int'), Variable('end', 'int')))
]
)
),
Variable('length', 'int', False, True): MethodSet(Variable('length', 'int', False, True)).add(
Method(
Variable('length', 'int', False, True),
[],
[
Step('return', Step('length', Variable('inner', 'String')))
]
)
)
})
)
}