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from .. import TypeEnum, Environment, Arg, Builtin, UserFunction, evaluate, interpret, parse, lex
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(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(interpretDef, [def_name_arg, def_val_arg]))
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(interpretRedef, [def_name_arg, def_val_arg]))
def interpretLambda(symbol, args, env, ns):
if len(args[0].args) != 0:
func = UserFunction("<lambda>", args[0].args, args[1:])
else:
func = UserFunction("<lambda>", [], args[1:])
return func
lambda_args_arg = Arg("args", TypeEnum.ANY, lazy=True)
lambda_body_arg = Arg("body", TypeEnum.ANY, lazy=True)
CORE.register("lambda", Builtin(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(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(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(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(interpretFunc, [def_name_arg, lambda_args_arg, lambda_body_arg], lambda_body_arg))
def interpretBlock(symbol, args, env, ns):
ret = List([])
for arg in args:
ret = evaluate(arg, env, ns)
return ret
block_arg = Arg("expr", TypeEnum.ANY, lazy=True)
CORE.register("block", Builtin(interpretBlock, [block_arg], block_arg))
def interpretWhile(symbol, args, env, ns):
cond = args[0]
ret = List([])
while True:
ev = evaluate(cond, 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, env, ns)
return ret
CORE.register("while", Builtin(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(interpretUse, [Arg("filename", TypeEnum.STRING)]))
def interpretAssert(symbol, args, env, ns):
if args[0].value != True:
raise InterpretPanic(symbol, "assertion failed")
return List([])
CORE.register("assert", Builtin(interpretAssert, [Arg("cond", TypeEnum.BOOL)]))
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)), ns=args[1].name)
return List([])
CORE.register("use-as", Builtin(interpretUseAs, [Arg("filename", TypeEnum.STRING), Arg("namespace", TypeEnum.ANY, lazy=True)]))
def interpretQuote(symbol, args, env, ns):
return args[0]
quote_arg = Arg("arg", TypeEnum.ANY, lazy=True)
CORE.register("quote", Builtin(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(interpretEval, [eval_arg]))
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