def _a_expression(f):
_a_term(f)
op = scanner._get_operator(f)
while op != "":
if op not in scanner._add_ops:
# Unget the op chars and reset scanner._nchar
f.seek(-len(op) - 1, 1)
scanner._nchar = f.read(1).decode("utf-8")
# Break out of the loop - not our operator
break
# TODO Handle unary ++ and --
codegen._push_primary()
_a_term(f)
codegen._pop_secondary()
# Flip order of primary and secondary for - b/c second argument is
# the one in primary. + is commutative so it doesn't matter for that
# case
regs = (codegen.PRIMARY, codegen.SECONDARY, codegen.PRIMARY)
if op == '+':
codegen._add(*regs)
elif op == '-':
codegen._sub(*regs)
else:
error._expected('+ or -')
op = scanner._get_operator(f)
def _p_assignment(f):
scanner._match(f, '(')
_expression(f)
scanner._match(f, ')')
codegen._push_primary()
scanner._match(f, '=')
_expression(f)
codegen._pop_secondary()
codegen._store_primary(0, codegen.SECONDARY)
def _relation(f):
_a_expression(f)
op = scanner._get_operator(f)
while op != "":
if op not in scanner._rel_ops:
# Unget the op chars and reset scanner._nchar
f.seek(-len(op) - 1, 1)
scanner._nchar = f.read(1).decode("utf-8")
# Break out of the loop - not our operator
break
codegen._push_primary()
_a_expression(f)
codegen._pop_secondary()
codegen._cmp_def(op)
op = scanner._get_operator(f)
def _term(f):
_factor(f)
op = scanner._get_operator(f)
while op != "":
if op not in scanner._and_ops:
# Unget the op chars and reset scanner._nchar
f.seek(-len(op) - 1, 1)
scanner._nchar = f.read(1).decode("utf-8")
# Break out of the loop - not our operator
break
codegen._push_primary()
_factor(f)
codegen._pop_secondary()
regs = (codegen.PRIMARY, codegen.PRIMARY, codegen.SECONDARY)
if op == '&':
codegen._bitwise_and(*regs)
elif op == '&&':
codegen._logical_and(*regs)
else:
error._expected('& or &&')
op = scanner._get_operator(f)
def _a_term(f):
_a_factor(f)
op = scanner._get_operator(f)
while op != "":
if op not in scanner._mul_ops:
# Unget the op chars and reset scanner._nchar
f.seek(-len(op) - 1, 1)
scanner._nchar = f.read(1).decode("utf-8")
# Break out of the loop - not our operator
break
codegen._push_primary()
_a_factor(f)
codegen._pop_secondary()
# Flip order for / for same reason as -. * is comm so doesn't matter
regs = (codegen.PRIMARY, codegen.SECONDARY, codegen.PRIMARY)
if op == '*':
codegen._mul(*regs)
elif op == '/':
codegen._div(*regs)
else:
error._expected('* or /')
op = scanner._get_operator(f)
def _expression(f):
_term(f)
op = scanner._get_operator(f)
while op != "":
if op not in scanner._or_ops:
# Unget the op chars and reset scanner._nchar
f.seek(-len(op) - 1, 1)
scanner._nchar = f.read(1).decode("utf-8")
# Break out of the loop - not our operator
break
codegen._push_primary()
_term(f)
codegen._pop_secondary()
# Both branches use the same arguments
regs = (codegen.PRIMARY, codegen.PRIMARY, codegen.SECONDARY)
if op == '|':
# Unpack the regs tuple as args
codegen._bitwise_or(*regs)
elif op == '||':
codegen._logical_or(*regs)
else:
error._expected('| or ||')
op = scanner._get_operator(f)