def generate_instructions(self, instr_list=None, flags=None):
"""
Generate code for a ``|`` operator if ``subtype == 'alt'``::
split L1, L2
L1: codes for e1
jmp L3
L2: codes for e2
L3:
If ``subtype != 'alt'``, then this node is reduced away during parsing.
"""
instr_list = instr_list or []
flags = flags or {}
if self.subtype == 'alt':
back_jump = len(instr_list)+1
first_split = Instruction('split', back_jump, 'TEMP')
instr_list.append(first_split)
instr_list = self.children[0].generate_instructions(instr_list, flags)
first_jump = Instruction('jmp', 'TEMP')
instr_list.append(first_jump)
first_split.arg2 = len(instr_list)
instr_list = self.children[1].generate_instructions(instr_list, flags)
first_jump.arg1 = len(instr_list)
return instr_list
return super(RegexNode, self).generate_instructions(instr_list, flags)
def generate_instructions(self, instr_list=None, flags=None):
"""
Generate code for a ``|`` operator if ``subtype == 'alt'``::
split L1, L2
L1: codes for e1
jmp L3
L2: codes for e2
L3:
If ``subtype != 'alt'``, then this node is reduced away during parsing.
"""
instr_list = instr_list or []
flags = flags or {}
if self.subtype == 'alt':
back_jump = len(instr_list) + 1
first_split = Instruction('split', back_jump, 'TEMP')
instr_list.append(first_split)
instr_list = self.children[0].generate_instructions(
instr_list, flags)
first_jump = Instruction('jmp', 'TEMP')
instr_list.append(first_jump)
first_split.arg2 = len(instr_list)
instr_list = self.children[1].generate_instructions(
instr_list, flags)
first_jump.arg1 = len(instr_list)
return instr_list
return super(RegexNode, self).generate_instructions(instr_list, flags)
def generate_instructions(self, instr_list=None, flags=None):
"""
Generate code for a +, *, or ? operator if ``subtype == 'dup'``.
e+::
L1: codes for e
split L1, L3
L3:
e*::
L1: split L2, L3
L2: codes for e
jmp L1
L3:
e?::
split L1, L2
L1: codes for e
L2:
"""
instr_list = instr_list or []
flags = flags or {}
if self.subtype == 'dup':
lchild = self.children[0]
if self.data == '+':
back_jump = len(instr_list)
instr_list = lchild.generate_instructions(instr_list, flags)
forward_jump = len(instr_list) + 1
instr_list.append(Instruction('split', back_jump,
forward_jump))
return instr_list
if self.data == '*' or self.data == '?':
back_jump = len(instr_list) + 1
first_split = Instruction('split', back_jump, 'TEMP')
instr_list.append(first_split)
instr_list = lchild.generate_instructions(instr_list)
if self.data == '*':
instr_list.append(Instruction('jmp', back_jump - 1))
first_split.arg2 = len(instr_list)
return instr_list
else:
return super(SimpleReNode,
self).generate_instructions(instr_list, flags)
def generate_instructions(self, instr_list=None, flags=None):
"""
Generate code for a +, *, or ? operator if ``subtype == 'dup'``.
e+::
L1: codes for e
split L1, L3
L3:
e*::
L1: split L2, L3
L2: codes for e
jmp L1
L3:
e?::
split L1, L2
L1: codes for e
L2:
"""
instr_list = instr_list or []
flags = flags or {}
if self.subtype == 'dup':
lchild = self.children[0]
if self.data == '+':
back_jump = len(instr_list)
instr_list = lchild.generate_instructions(instr_list, flags)
forward_jump = len(instr_list) + 1
instr_list.append(Instruction('split', back_jump, forward_jump))
return instr_list
if self.data == '*' or self.data == '?':
back_jump = len(instr_list)+1
first_split = Instruction('split', back_jump, 'TEMP')
instr_list.append(first_split)
instr_list = lchild.generate_instructions(instr_list)
if self.data == '*':
instr_list.append(Instruction('jmp', back_jump-1))
first_split.arg2 = len(instr_list)
return instr_list
else:
return super(SimpleReNode, self).generate_instructions(instr_list, flags)
