python自动格式化json文件，python格式化json,class JsonFo

python自动格式化json文件，python格式化json,class JsonFo

class JsonFormatter:    def __init__(self,intend=4,name=""):        self.name=name        self.intend=intend        self.stack=[]        self.obj=None        self.source=self.get_source(name)        self.prepare()    @staticmethod    def json_str(s):        return '"'+s+'"'    @staticmethod    def get_source(name):        with open(name,'r') as f:            return ''.join(f.read().split())    def prepare(self):        try:            self.obj=eval(self.source)        except:            raise Exception('Invalid json string!')    def line_intend(self,level=0):        return '\n'+' '*self.intend*level    def parse_dict(self,obj=None,intend_level=0):        self.stack.append(self.line_intend(intend_level)+'{')        intend_level+=1        for key,value in obj.items():            key=self.json_str(str(key))            self.stack.append(self.line_intend(intend_level)+key+':')            self.parse(value,intend_level)            self.stack.append(',')        self.stack.append(self.line_intend(intend_level-1)+'}')    def parse_list(self,obj=None,intend_level=0):        self.stack.append(self.line_intend(intend_level)+'[')        intend_level+=1        for item in obj:            self.parse(item,intend_level)            self.stack.append(',')        self.stack.append(self.line_intend(intend_level-1)+']')    def parse(self,obj,intend_level=0):        if obj is None:            self.stack.append('null')        elif obj is True:            self.stack.append('true')        elif obj is False:            self.stack.append('false')        elif isinstance(obj,(int,long,float)):            self.stack.append(str(obj))        elif isinstance(obj,str):            self.stack.append(self.json_str(obj))        elif isinstance(obj,(list,tuple)):            self.parse_list(obj,intend_level)        elif isinstance(obj,dict):            self.parse_dict(obj,intend_level)        else:            raise Exception('Invalid json type %s!' % obj)    def render(self):        self.parse(self.obj,0)        res_file='good'+self.name        res=''.join(self.stack)        with open(res_file,'w') as f:            f.write(res)        print resif __name__=="__main__":    jf=JsonFormatter(name="json.txt")    jf.render()