//<语句列>::= <语句>{<语句>}
void Parser::stmts(ifstream &file, Stmt &s) {
while (look.tag != RBRACE) {
if (look.tag == Null)
return;
s.gen(stmt(file));
}
}
//<赋值语句>::= <标识符>＝<表达式>
Stmt Parser::assign(ifstream &file, Token tok) {
Stmt stmt;
Id id;
if (tok.tag == ID) {
id = (*(tables.get(proc))).get(tok.lexeme);
if (id.kind == CONSTANT) {
Error(24, lex.line, "\'" + id.op.lexeme + "\': cannot assign to a variable that is const.").print();
}
}
else
Error(12, lex.line).print();
if (look.tag == ASSIGN) {
move(file);
Set stmt(id, expr(file));
match(SEMI, file, Error(6, lex.line));
stmt.gen();
return stmt;
}
Error(16, lex.line).print();
return stmt;
}
