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from tokens import *
import sys
from collections import namedtuple
FuncImpl = namedtuple("FuncImpl", ("func", "impl"))
STD = {}
DEBUG = True
USER = {}
def _get_debug():
return DEBUG
def std_exit(status=None):
out = 0 if status is None else status.value
sys.exit(out)
return NebBool(True) # this should never be reached
def std_print(arg):
print(arg.value)
#return [] # TODO this should return empty list
return NebBool(True)
def std_debug_on():
global DEBUG
DEBUG = True
return NebBool(True)
def std_debug_off():
global DEBUG
DEBUG = False
return NebBool(True)
# math
def std_add(arg1, arg2):
res = arg1.value + arg2.value
if isinstance(arg1, NebFloat) or isinstance(arg2, NebFloat):
return NebFloat(res)
else:
return NebInt(res)
def std_subtract(arg1, arg2):
res = arg1.value - arg2.value
if isinstance(arg1, NebFloat) or isinstance(arg2, NebFloat):
return NebFloat(res)
else:
return NebInt(res)
def std_multiply(arg1, arg2):
res = arg1.value * arg2.value
if isinstance(arg1, NebFloat) or isinstance(arg2, NebFloat):
return NebFloat(res)
else:
return NebInt(res)
# strings
def std_concat(arg1, arg2):
return NebString(f"{arg1.value}{arg2.value}")
# flow control
def std_if(cond, t_branch, f_branch):
if cond.value:
if isinstance(t_branch, NebExpression):
ret = evaluate_expression(t_branch)
else:
ret = t_branch
else:
if isinstance(t_branch, NebExpression):
ret = evaluate_expression(f_branch)
else:
ret = f_branch
return ret
# type validation
def std_is_string(arg):
if isinstance(arg, NebString):
return NebBool(True)
else:
return NebBool(False)
def std_is_int(arg):
if isinstance(arg, NebInt):
return NebBool(True)
else:
return NebBool(False)
def std_is_float(arg):
if isinstance(arg, NebFloat):
return NebBool(True)
else:
return NebBool(False)
def std_is_number(arg):
if isinstance(arg, NebNumber):
return NebBool(True)
else:
return NebBool(False)
def std_is_bool(arg):
if isinstance(arg, NebBool):
return NebBool(True)
else:
return NebBool(False)
def evaluate_expression(expr):
if not expr.symbol.name in STD:
raise Exception(f"no such symbol: {expr.symbol.name}")
this_func = STD[expr.symbol.name]
# try to match the signature
validated = 0
in_sig = expr.args
for value in this_func:
sig = value.func.args
validated = 0
if len(sig) != len(in_sig):
continue
for idx in range(len(sig)):
if isinstance(in_sig[idx], sig[idx]):
validated += 1
if validated == len(sig):
ret = value.impl(*(expr.args))
return ret
# evaluate inner expressions, if possible/necessary
for idx, arg in enumerate(expr.args):
if isinstance(arg, NebExpression):
expr.args[idx] = evaluate_expression(arg)
return evaluate_expression(expr)
raise Exception(f"'{expr.symbol.name}' called with unknown signature: '{expr.in_sig()}'")
def build_std():
print_string = FuncImpl(NebFunction("print", [NebString], NebString), std_print)
STD["print"] = [print_string]
exit_ = FuncImpl(NebFunction("exit", [], NebBool), std_exit)
exit_int = FuncImpl(NebFunction("exit", [NebInt], NebBool), std_exit)
STD["exit"] = [exit_, exit_int]
debug_on = FuncImpl(NebFunction("debug-on", [], NebBool), std_debug_on)
STD["debug-on"] = [debug_on]
debug_off = FuncImpl(NebFunction("debug-off", [], NebBool), std_debug_off)
STD["debug-off"] = [debug_off]
# arithmetic
add = FuncImpl(NebFunction("+", [NebNumber, NebNumber], NebNumber), std_add)
STD["+"] = [add]
subtract = FuncImpl(NebFunction("-", [NebNumber, NebNumber], NebNumber), std_subtract)
STD["-"] = [subtract]
multiply = FuncImpl(NebFunction("*", [NebNumber, NebNumber], NebNumber), std_multiply)
STD["*"] = [multiply]
# strings
concat_string_string = FuncImpl(NebFunction("concat", [NebString, NebString], NebString), std_concat)
STD["concat"] = [concat_string_string]
# flow control
if_bool_expr_expr = FuncImpl(NebFunction("if", [NebBool, NebAny, NebAny], NebAny), std_if)
STD["if"] = [if_bool_expr_expr]
# type checking
is_string = FuncImpl(NebFunction("string?", [NebAny], NebBool), std_is_string)
STD["string?"] = [is_string]
is_int = FuncImpl(NebFunction("string?", [NebAny], NebBool), std_is_int)
STD["int?"] = [is_int]
is_float = FuncImpl(NebFunction("string?", [NebAny], NebBool), std_is_float)
STD["float?"] = [is_float]
is_number = FuncImpl(NebFunction("string?", [NebAny], NebBool), std_is_number)
STD["number?"] = [is_number]
is_bool = FuncImpl(NebFunction("string?", [NebAny], NebBool), std_is_bool)
STD["bool?"] = [is_bool]
build_std()
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