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Nasal-Interpreter
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Update PDA demo

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Valk Richard Li 2019-08-30 02:56:09 -05:00 committed by GitHub
parent 105de4234f
commit 79e6202772
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1 changed files with 10 additions and 4 deletions
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14
version0.7/pda_demo.cpp
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@ -5,10 +5,10 @@
enum token_type
{
e=1,E,_E,T,_T,F,I,__add,__sub,__mul,__div,__left_curve,__right_curve,sharp
e=1,E,_E,T,_T,F,I,__add,__sub,__mul,__div,__link,__left_curve,__right_curve,sharp
};
const int max_len=3;
const int max_len=5;
struct cmp_seq
{
int tokens[max_len];
@ -19,6 +19,7 @@ cmp_seq par[]=
{{T,_E}, E},
{{__add,T,_E}, _E},
{{__sub,T,_E}, _E},
{{__link,T,_E}, _E},
{{e}, _E},
{{F,_T}, T},
{{__mul,F,_T}, _T},
@ -34,14 +35,14 @@ cmp_seq first_set[]=
{{__left_curve,I},E},
{{__left_curve,I},T},
{{__left_curve,I},F},
{{__add,__sub,e},_E},
{{__add,__sub,__link,e},_E},
{{__mul,__div,e},_T},
};
int num_of_set=sizeof(first_set)/sizeof(cmp_seq);
bool isEnd(int type)
{
return ((type==__left_curve) || (type==__right_curve) || (type==I) || (type==__add) || (type==__sub) || (type==__mul) || (type==__div) || (type==e) || (type==sharp));
return ((type==__left_curve) || (type==__right_curve) || (type==I) || (type==__add) || (type==__sub) || (type==__mul) || (type==__div) || (type==__link) || (type==e) || (type==sharp));
}
bool isHead(int head,int type)
{
@ -120,6 +121,9 @@ void print_token(int type)
case __div:
str="/";
break;
case __link:
str="~";
break;
case __left_curve:
str="(";
break;
@ -159,6 +163,8 @@ class PDA
main_stack.push(__mul);
else if(text[i]=='/')
main_stack.push(__div);
else if(text[i]=='~')
main_stack.push(__link);
}
comp_stack.push(sharp);
comp_stack.push(E);