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main.py
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main.py
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import argparse
from src import constants, grammar, parser, tokenizer, tester
# 创建CFG文法
def create_cfg():
CONSTANT_GENERATOR_START_MARK = 'P\''
CONSTANT_GENERATOR_END_MARK = '$'
# 终结符号
CONSTANT_GENERATOR_END_SYMBOLS = {constants.CONSTANT_TOKEN_NAME_IDENTIFIER,
constants.CONSTANT_TOKEN_NAME_CONSTANT,
constants.CONSTANT_GENERATOR_NONE} \
.union(constants.CONSTANT_SET_KEYWORDS) \
.union(constants.CONSTANT_SET_OPERATORS) \
.union(constants.CONSTANT_SET_SEPARATORS)
# 产生一条三地址代码
def gen_instr(ls: list[str]):
retStr = f'{" ".join(ls)}'
return retStr
tmp_name_cnt = 0
debug_mode = True
# 为三地址代码产生一个临时变量名
def gen_tmp_name():
nonlocal tmp_name_cnt
tmp_name_cnt += 1
return f'p{tmp_name_cnt}'
# 为三地址代码产生一个临时标签
tmp_label_cnt = 0
def gen_tmp_label():
nonlocal tmp_label_cnt
tmp_label_cnt += 1
return f'l{tmp_label_cnt}'
# 返回递归子程序的闭包，执行的同时打印调试信息，未使用
def sdd_wrapper(func):
def sdd_func(input_symbols: list[grammar.Symbol], reduction_symbol: grammar.Symbol, st: parser.SymbolTable):
func(input_symbols, reduction_symbol, st)
if debug_mode:
print(f'sdd: {[str(s) for s in input_symbols]} -> {reduction_symbol} ')
return sdd_func
# 实现SDD语义的递归子程序
def sdd_l(input_symbols: list[grammar.Symbol], reduction_symbol: grammar.Symbol, st: parser.SymbolTable):
reduction_symbol.__setattr__(constants.CONSTANT_SDD_ATTR_TYPE, input_symbols[0].content)
reduction_symbol.__setattr__(constants.CONSTANT_SDD_ATTR_WIDTH, 4)
def sdd_d(input_symbols: list[grammar.Symbol], reduction_symbol: grammar.Symbol, st: parser.SymbolTable):
st_type = input_symbols[0].__getattribute__(constants.CONSTANT_SDD_ATTR_TYPE)
id_content = input_symbols[1].content
st.put_entry(id_content, st_type)
def sdd_s(input_symbols: list[grammar.Symbol], reduction_symbol: grammar.Symbol, st: parser.SymbolTable):
s_code = []
for i in range(len(input_symbols)):
s = input_symbols[i]
if s.content in CONSTANT_GENERATOR_END_SYMBOLS:
continue
s_code += s.__getattribute__(constants.CONSTANT_SDD_ATTR_CODE)
reduction_symbol.__setattr__(constants.CONSTANT_SDD_ATTR_CODE, s_code)
def sdd_p(input_symbols: list[grammar.Symbol], reduction_symbol: grammar.Symbol, st: parser.SymbolTable):
p_code = []
p_code += input_symbols[1].__getattribute__(constants.CONSTANT_SDD_ATTR_CODE)
reduction_symbol.__setattr__(constants.CONSTANT_SDD_ATTR_CODE, p_code)
def sdd_s0(input_symbols: list[grammar.Symbol], reduction_symbol: grammar.Symbol, st: parser.SymbolTable):
s_id = input_symbols[0]
result = input_symbols[2]
e_code = result.__getattribute__(constants.CONSTANT_SDD_ATTR_CODE)
e_name = result.__getattribute__(constants.CONSTANT_SDD_ATTR_NAME)
s_code = e_code + [gen_instr([s_id.content, '=', e_name])]
reduction_symbol.__setattr__(constants.CONSTANT_SDD_ATTR_CODE, s_code)
def sdd_t_lex(input_symbols: list[grammar.Symbol], reduction_symbol: grammar.Symbol, st: parser.SymbolTable):
name = gen_tmp_name()
val = input_symbols[0].content
code = [gen_instr([name, '=', val])]
reduction_symbol.__setattr__(constants.CONSTANT_SDD_ATTR_CODE, code)
reduction_symbol.__setattr__(constants.CONSTANT_SDD_ATTR_NAME, name)
def sdd_t_id(input_symbols: list[grammar.Symbol], reduction_symbol: grammar.Symbol, st: parser.SymbolTable):
code = []
reduction_symbol.__setattr__(constants.CONSTANT_SDD_ATTR_CODE, code)
reduction_symbol.__setattr__(constants.CONSTANT_SDD_ATTR_NAME, input_symbols[0].content)
def sdd_e_op(input_symbols: list[grammar.Symbol], reduction_symbol: grammar.Symbol, st: parser.SymbolTable):
code = ['']
name1 = input_symbols[0].__getattribute__(constants.CONSTANT_SDD_ATTR_NAME)
name2 = input_symbols[2].__getattribute__(constants.CONSTANT_SDD_ATTR_NAME)
name = gen_tmp_name()
code[0] = gen_instr([name, '=', name1, input_symbols[1].content, name2])
reduction_symbol.__setattr__(constants.CONSTANT_SDD_ATTR_NAME, name)
reduction_symbol.__setattr__(constants.CONSTANT_SDD_ATTR_CODE, code)
def sdd_e(input_symbols: list[grammar.Symbol], reduction_symbol: grammar.Symbol, st: parser.SymbolTable):
code = input_symbols[0].__getattribute__(constants.CONSTANT_SDD_ATTR_CODE)
name = input_symbols[0].__getattribute__(constants.CONSTANT_SDD_ATTR_NAME)
reduction_symbol.__setattr__(constants.CONSTANT_SDD_ATTR_CODE, code)
reduction_symbol.__setattr__(constants.CONSTANT_SDD_ATTR_NAME, name)
def sdd_if(input_symbols: list[grammar.Symbol], reduction_symbol: grammar.Symbol, st: parser.SymbolTable):
s_next = gen_tmp_label()
true_next = gen_tmp_label()
false_next = gen_tmp_label()
b = input_symbols[2]
s1 = input_symbols[4]
s2 = input_symbols[7]
s1_next = s_next
s2_next = s_next
b_name = b.__getattribute__(constants.CONSTANT_SDD_ATTR_NAME)
s_code = []
s_code += b.__getattribute__(constants.CONSTANT_SDD_ATTR_CODE)
s_code += [f'if False {b_name} goto {false_next}']
s_code += [f'{true_next}: '] + s1.__getattribute__(constants.CONSTANT_SDD_ATTR_CODE)
s_code += [gen_instr(['goto', s_next])]
s_code += [f'{false_next}: '] + s2.__getattribute__(constants.CONSTANT_SDD_ATTR_CODE)
s_code += [f'{s_next}:']
reduction_symbol.__setattr__(constants.CONSTANT_SDD_ATTR_CODE, s_code)
pass
# 定义产生式
c_generators = [
grammar.ComposedGenerator('P\'', [['P']]), # 增广文法的第一个产生式
grammar.ComposedGenerator('P', [['D', 'S']], func=sdd_p),
grammar.ComposedGenerator('D', [[constants.CONSTANT_GENERATOR_NONE],
['D0', ';'],
['D0', ';', 'D']]),
grammar.ComposedGenerator('D0', [['L', constants.CONSTANT_TOKEN_NAME_IDENTIFIER]], func=sdd_d),
grammar.ComposedGenerator('L', [['int'], ['float']], func=sdd_l),
grammar.ComposedGenerator('S', [['S0', ';'], ['S0', ';', 'S']], func=sdd_s),
grammar.ComposedGenerator('S0', [[constants.CONSTANT_TOKEN_NAME_IDENTIFIER, '=', 'E']], func=sdd_s0),
grammar.ComposedGenerator('S0', [['if', '(', 'C', ')', 'S0', ';', 'else', 'S0']], func=sdd_if),
grammar.ComposedGenerator('T', [[constants.CONSTANT_TOKEN_NAME_CONSTANT]], func=sdd_t_lex),
grammar.ComposedGenerator('T', [[constants.CONSTANT_TOKEN_NAME_IDENTIFIER]], func=sdd_t_id),
grammar.ComposedGenerator('C', [['E', '>', 'E'], ['E', '<', 'E'], ['E', '==', 'E']], func=sdd_e_op),
grammar.ComposedGenerator('E', [['T']], func=sdd_e),
grammar.ComposedGenerator('E', [['E', '+', 'T'], ['E', '-', 'T']], func=sdd_e_op),
]
return grammar.GrammarCFG(
start_mark=CONSTANT_GENERATOR_START_MARK,
end_mark=CONSTANT_GENERATOR_END_MARK,
end_symbols=CONSTANT_GENERATOR_END_SYMBOLS,
c_generators=c_generators
)
# 运行单元测试
def test(te: tester.Tester):
pass
if __name__ == '__main__':
# 解析输入参数
argParser = argparse.ArgumentParser(description='语法分析器 (SDD)')
argParser.add_argument('--in', dest='input_file', type=str, help='输入程序文件')
args = argParser.parse_args()
# 获取CFG文法
cfg = create_cfg()
# 创建 Tokenizer 和 Parser
parser = parser.Parser(cfg, debug_mode=False)
tr = tokenizer.Tokenizer(input_path=args.input_file, cfg=cfg, debug_mode=False)
# 运行测试
# te = tester.Tester(cfg=cfg, parser=parser)
# test(te)
# 用所有输入初始化格局
tokens = tr.read_all_left_tokens()
parser.init_config(tokens)
# 解析
parser.parse_all(show=True)