static void statement()
{
int second_token;
if(token == TOK_IF){
selection_stmt();
}else if(token == TOK_LBRACKET){
compound_stmt();
}else if(token == TOK_ID||token == TOK_AND){
second_token = virtual_get_token(true);
if(second_token == TOK_ASSIGN){
assign_stmt();
}else if(second_token == TOK_LSQUARE){
while(second_token!=TOK_RSQUARE){
second_token = virtual_get_token(false);
if(second_token == TOK_ASSIGN
||second_token == TOK_SEMI
||second_token == TOK_EOF)
{
fprintf( stderr, "line %d: error array var", save_line );
break;
}
}
second_token = virtual_get_token(false);
if(second_token == TOK_ASSIGN){
assign_stmt();
}else{
expression_stmt();
}
}else{
expression_stmt();
}
}else if(token == TOK_WHILE||token == TOK_FOR){
iteration_stmt();
}else if(token == TOK_RETURN){
return_stmt();
}else if(token == TOK_SEMI){
match(TOK_SEMI);
}else
fprintf( stderr, "line %d: error statements", save_line );
}
/* EBNF: statment -> expression-stmt | compound-stmt |
* selection-stmt | iteration-stmt | return-stmt */
static TreeNode * statement (void)
{ TreeNode * t = NULL;
while (token == COMMENT) unexpectedTokenHandling();
switch (token)
{
/* First(expression-stmt)={ID,LPAREN,NUM} */
case ID: case LPAREN: case NUM:
t = expression_stmt(); break;
case CLPAREN: t = compound_stmt(); break;
case IF: t = selection_stmt(); break;
case WHILE: t = iteration_stmt(); break;
case RETURN: t = return_stmt(); break;
default:
unexpectedTokenHandling();
break;
}
return t;
}
