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from .. import TypeEnum, Environment, Arg, Builtin, UserFunction, evaluate, interpret, parse, lex, InterpretPanic, TypeWrap, Function, UserType
from ..structs import *
from pathlib import Path
CORE = Environment()
def interpretIf(symbol, args, env, ns):
if args[0].value:
return evaluate(args[1], env, ns)
elif len(args) == 3:
return evaluate(args[2], env, ns)
return List([])
cond = Arg("cond", TypeEnum.BOOL)
t_branch = Arg("t-branch", TypeEnum.ANY, lazy=True)
f_branch = Arg("f-branch", TypeEnum.ANY, optional=True, lazy=True)
CORE.register("if", Builtin("if", interpretIf, [cond, t_branch, f_branch]))
def interpretDef(symbol, args, env, ns):
if not isinstance(args[0], Symbol):
raise InterpretPanic(symbol, "requires a :string name", args[0])
name = args[0].name # NOTE: we are not evaluating the name!!
if not isinstance(name, str):
raise InterpretPanic(symbol, "requires a :string name")
env.register(name, args[1]) # TODO since this isn't lazily evaluated, side effects are allowed (bad!)
return List([])
def_name_arg = Arg("name", TypeEnum.ANY, lazy=True)
def_val_arg = Arg("value", TypeEnum.ANY)
CORE.register("def", Builtin("def", interpretDef, [def_name_arg, def_val_arg], return_type=Type(":list")))
def interpretRedef(symbol, args, env, ns):
if not isinstance(args[0], Symbol):
raise InterpretPanic(symbol, "requires a :string name", args[0])
name = args[0].name # NOTE: we are not evaluating the name!!
if not env.contains(name):
raise InterpretPanic(symbol, "not previously defined", args[0])
env.reregister(name, args[1])
return List([])
CORE.register("redef", Builtin("redef", interpretRedef, [def_name_arg, def_val_arg], return_type=Type(":list")))
def interpretLambda(symbol, args, env, ns):
new_args = args
return_type = Type(":any")
if isinstance(args[0], Type):
return_type = args[0]
new_args = args[1:]
if len(new_args[0].args) != 0:
func = UserFunction("<lambda>", new_args[0].args, new_args[1:])
else:
func = UserFunction("<lambda>", [], new_args[1:])
func.return_type = return_type
return func
lambda_args_arg = Arg("args", TypeEnum.ANY, lazy=True)
lambda_body_arg = Arg("body", TypeEnum.ANY, lazy=True)
CORE.register("lambda", Builtin("lambda", interpretLambda, [lambda_args_arg, lambda_body_arg], lambda_body_arg))
def interpretForCount(symbol, args, env, ns):
new_env = Environment(env)
ret = None
for idx in range(0, args[0].value):
new_env.register("idx", Int(idx + 1))
for arg in args[1:]:
ret = evaluate(arg, new_env, ns)
if ret is None:
return List([])
return ret
for_count_arg = Arg("count", TypeEnum.INT)
for_body_arg = Arg("body", TypeEnum.ANY, lazy=True)
CORE.register("for-count", Builtin("for-count", interpretForCount, [for_count_arg, for_body_arg], for_body_arg))
def interpretForEach(symbol, args, env, ns):
new_env = Environment(env)
ret = None
for item in args[0].args:
new_env.register("_item_", evaluate(item, env, ns))
for arg in args[1:]:
ret = evaluate(arg, new_env, ns)
if ret is None:
return List([])
return ret
for_each_arg = Arg("list", TypeEnum.LIST)
CORE.register("for-each", Builtin("for-each", interpretForEach, [for_each_arg, for_body_arg], for_body_arg))
def interpretBranch(symbol, args, env, ns):
for arg in args:
if len(arg.args) != 2:
raise InterpretPanic(symbol, "each branch requires two expressions")
cond = evaluate(arg.args[0], env, ns) # this is the condition
if not isinstance(cond, Bool):
raise InterpretPanic(symbol, "branch condition must be :bool", cond)
if cond.value:
return evaluate(arg.args[1], env, ns)
return List([])
CORE.register("branch", Builtin("branch", interpretBranch, [for_body_arg], for_body_arg))
def interpretFunc(symbol, args, env, ns):
if not isinstance(args[0], Symbol):
raise InterpretPanic(symbol, "requires a :string name")
name = args[0].name # NOTE: we are not evaluating the name!!
if ns is not None:
name = f"{ns}/{name}"
# compose a lambda
func = interpretLambda(None, args[1:], env, ns)
# add the name to the function
func.name = name
env.register(name, func)
return List([])
CORE.register("func", Builtin("func", interpretFunc, [def_name_arg, lambda_args_arg, lambda_body_arg], lambda_body_arg, Type(":list")))
def interpretBlock(symbol, args, env, ns):
new_env = Environment(env)
ret = List([])
for arg in args:
ret = evaluate(arg, new_env, ns)
return ret
block_arg = Arg("expr", TypeEnum.ANY, lazy=True)
CORE.register("block", Builtin("block", interpretBlock, [block_arg], block_arg))
def interpretWhile(symbol, args, env, ns):
new_env = Environment(env)
cond = args[0]
ret = List([])
while True:
ev = evaluate(cond, new_env, ns)
if not isinstance(ev, Bool):
raise InterpretPanic(symbol, "expects a :bool condition", ev)
if not ev.value:
break
for arg in args[1:]:
ret = evaluate(arg, new_env, ns)
return ret
CORE.register("while", Builtin("while", interpretWhile, [Arg("cond", TypeEnum.BOOL, lazy=True)], Arg("expr", TypeEnum.ANY, lazy=True)))
def interpretUse(symbol, args, env, ns):
target_file_name = args[0].value
target_file = Path(target_file_name).resolve()
if not target_file.exists():
raise InterpretPanic(symbol, "no such file", target_file)
with open(target_file, "r") as fil:
data = fil.read()
interpret(parse(lex(data)), env, ns)
return List([])
CORE.register("use", Builtin("use", interpretUse, [Arg("filename", TypeEnum.STRING)], return_type=Type(":list")))
def interpretAssert(symbol, args, env, ns):
if args[0].value != True:
raise InterpretPanic(symbol, "assertion failed")
return List([])
CORE.register("assert", Builtin("assert", interpretAssert, [Arg("cond", TypeEnum.BOOL)], return_type=Type(":list")))
def interpretUseAs(symbol, args, env, ns):
target_file_name = args[0].value
target_file = Path(target_file_name).resolve()
if not target_file.exists():
raise InterpretPanic(symbol, "no such file", target_file)
with open(target_file, "r") as fil:
data = fil.read()
interpret(parse(lex(data)), env, args[1].name)
return List([])
CORE.register("use-as", Builtin("use-as", interpretUseAs, [Arg("filename", TypeEnum.STRING), Arg("namespace", TypeEnum.ANY, lazy=True)], return_type=Type(":list")))
def interpretQuote(symbol, args, env, ns):
return args[0]
quote_arg = Arg("arg", TypeEnum.ANY, lazy=True)
CORE.register("quote", Builtin("quote", interpretQuote, [quote_arg]))
def interpretEval(symbol, args, env, ns):
return evaluate(args[0], env, ns) # TODO why do i have to explicitly evaluate here?
eval_arg = Arg("arg", TypeEnum.ANY)
CORE.register("eval", Builtin("eval", interpretEval, [eval_arg]))
def interpretType(symbol, args, env, ns):
# (type typename parent func)
if not isinstance(args[0], Type):
raise InterpretPanic(symbol, "types must begin with a colon")
name = args[0].name # NOTE: we are not evaluating the name!!
# TODO we may need to do namespace things here
# also, we probably shouldn't be able to rename types
if not isinstance(args[1], TypeWrap):
raise InterpretPanic(symbol, "parent must be a valid type", args[1])
elif not env.contains(args[1].name.name):
raise InterpretPanic(symbol, f"no such type {args[1]}")
parent = env.get(args[1].name.name)
func = args[2]
if not isinstance(func, Function):
raise InterpretPanic(symbol, "validation must be a :func", func)
new_type = UserType(name, parent, func)
env.register(name, new_type)
return List([])
type_name_arg = Arg("name", TypeEnum.ANY, lazy=True)
type_parent_arg = Arg("name", TypeEnum.ANY)
type_func_arg = Arg("func", TypeEnum.ANY)
CORE.register("type", Builtin("type", interpretType, [type_name_arg, type_parent_arg, type_func_arg]))
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