所以我生成了一个解析器,使用JISON
:
%lex
%x TEXT
%%
("Project"|"project") {return 'PROJECTCOMMAND';}
"-au" {return 'ADDUSER';}
"-n" {this.begin('TEXT'); return 'NAMEOPTION';}
"-k" {return 'KEYOPTION';}
"-desc" {return 'DESCRIPTION';}
("--add"|"-a") {return 'ADDOPTION';}
<TEXT>[-a-zA-Z0-9@\.]+ {this.popState(); return 'TEXT';}
<INITIAL,TEXT>\s+ // Ignore white space...
/lex
%%
line :
PROJECTCOMMAND ADDUSER
{
//Project Command of add user
var res = new Object();
res.value = "addUser Project";
return res;
}
| PROJECTCOMMAND ADDOPTION
{
//Project Command with no arguments
var res = new Object();
res.value = "addProject";
return res;
}
| PROJECTCOMMAND ADDOPTION NAMEOPTION TEXT
{
//Project command with project name as argument
var res = new Object();
res.value = "addProject name";
res.name = $4;
return res;
}
有什么方法可以对命令进行验证,即如果命令不满足上述任何规则,则抛出错误,即具有默认选项。
在解析器结束时是这样的:
| return "command is invalid";
提前致谢