Comments (4)
orangeduck
commented on July 19, 2024
1
Your grammar seems to say that inside the body of a function there should be a single variable declaration followed by multiple statements: '{' <decls> <stmt>* '}'. I think you probably mean something more like there should be multiple of either variable declarations or statements, something more like: '{' (<decls> | <stmt>)* '}'.
Anyway I think these are issues with your grammar rather than the behaviour of mpc which I think you can debug yourself. Feel free to reopen this issue if you think there is a bug with mpc but for now I am going to close it.
Hope you manage to get it working as intended 👍
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orangeduck
commented on July 19, 2024
Looks like it is trying to parse the procedure as a decls and failing. I suspect this might work as intended if you change <decls> to <decls>*.
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ikbenlike
commented on July 19, 2024
I assume you meant that about the <decls> on this line?
" xenon : /^/ <use> <decls>* <procedure>* /$/ ; \n"Doing that (and a few other things) solved the problem, but it also created a new one.
This is my full grammar:
" ident : /[a-zA-Z_][a-zA-Z0-9_]*/ ; \n"
" number : /-?[0-9]+(\\.[0-9]*)?/ ; \n"
" character : /'.' | \".\"/ ; \n"
" string : /\"(\\\\.|[^\"])*\"/ ; \n"
" boolean : /true | false/ ; \n"
" \n"
" print : /\"print\" (<ident> | <string>)/ ; \n"
" factor : '(' <lexp> ')' \n"
" | <number> \n"
" | <character> \n"
" | <string> \n"
" | <ident> '(' <lexp>? (',' <lexp>)* ')' \n"
" | <ident> ; \n"
" \n"
" term : <factor> (('*' | '/' | '%') <factor>)* ; \n"
" lexp : <term> <index>* (('+' | '-') <term> <index>* )* ; \n"
" \n"
" index : '[' <number> ']' ; \n"
" stmt : '{' <stmt>* '}' \n"
" | \"while\" '(' <exp> <index>* ')' <stmt> \n"
" | \"for\" '(' <exp> <index>* ')' <stmt> \n"
" | \"if\" '(' <exp> ')' <stmt> \n"
" | \"loop\" <stmt> \n"
" | <ident> '=' <lexp> <index>* ';' \n"
" | \"print\" '(' <lexp>? ')' ';' \n"
" | \"return\" <lexp>? ';' \n"
" | <ident> <index>* ';' \n"
" | <ident> '(' <ident>? (',' <ident>)* ')' <index>* ';'; \n"
" \n"
" exp : <lexp> '>' <lexp> \n"
" | <lexp> '<' <lexp> \n"
" | <lexp> \">=\" <lexp> \n"
" | <lexp> \"<=\" <lexp> \n"
" | <lexp> \"!=\" <lexp> \n"
" | <lexp> \"==\" <lexp> \n"
" | <lexp> \"in\" <lexp> ; \n"
" \n"
" typeident : (\"int\" | \"char\" | \"str\" | \"bool\" | \"float\" ) <ident> ; \n"
" procedure : (\"int\" | \"char\" | \"str\" | \"bool\" | \"float\" ) ':' <ident> '(' <args> ')' <body> ; \n"
" decls : <typeident> '=' ( <number> | <character> | <string> | <boolean> | <term> ) <index>* ';' ; \n"
" args : <typeident>? (',' <typeident>)* ; \n"
" body : '{' <decls> <stmt>* '}' ; \n"
" use : (\"use\" /[a-zA-Z_\\/\\.][a-zA-Z0-9_\\/\\.]*/)* ; \n"
" `xenon : /^/ <use> <decls>* <procedure>* /$/ ;` \n"I'm trying to parse this file (yes, the variable names are just random crap):
int:stuff(str string_to_print){
int alasfdk = 1;
puts(stuff);
float jKAHalskdjf = 1.1;
str calskf = "stuff";
}
But, it's throwing this error:
print.pxe:4:11: error: expected '=', '[', ';' or '(' at 'j'
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ikbenlike
commented on July 19, 2024
That worked. Thanks for your help!
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