ScopeStmt* read_scopestmt () {
AstTag tag = read_int();
switch(tag) {
case VAR_STMT: {
char* name = read_string();
Exp* exp = read_exp();
return make_ScopeVar(name, exp);
}
case FN_STMT: {
char* name = read_string();
int nargs = read_int();
char** args = read_strings(nargs);
ScopeStmt* body = read_scopestmt();
return make_ScopeFn(name, nargs, args, body);
}
case SEQ_STMT: {
ScopeStmt* a = read_scopestmt();
ScopeStmt* b = read_scopestmt();
return make_ScopeSeq(a, b);
}
case EXP_STMT: {
Exp* e = read_exp();
return make_ScopeExp(e);
}
default: {
printf("Scope statement with unrecognized tag: %d\n", tag);
exit(-1);
}
}
return 0;
}
int run_exp(const char *exp) {
int error = 0;
data_t *exp_list = read_exp(exp, NULL, &error);
if(error)
return error;
eval(exp_list, the_global_env);
return 0;
}
SlotStmt* read_slot () {
AstTag tag = read_int();
switch(tag) {
case VAR_STMT: {
char* name = read_string();
Exp* exp = read_exp();
return make_SlotVar(name, exp);
}
case FN_STMT: {
char* name = read_string();
int nargs = read_int();
char** args = read_strings(nargs);
ScopeStmt* body = read_scopestmt();
return make_SlotMethod(name, nargs, args, body);
}
default: {
printf("Unrecognized slot with tag: %d\n", tag);
exit(-1);
}
}
}
/**********************************************************************
*
* get_args
*/
static int get_args(REG1 int argc, char* argv[])
{
REG2 int opt;
opterr = FALSE; /* handle errors ourselves */
while ((opt = getopt(argc, argv, "bdchilnoprstvxz123456789A:B:e:f:D")) != EOF) {
switch (opt) {
case 'A':
trailing_context = (unsigned)atoi(optarg);
break;
case 'B':
leading_context = (unsigned)atoi(optarg);
break;
case 'b':
block_mode = TRUE;
break;
case 'd':
no_boymoore = TRUE;
break;
case 'c':
count = TRUE;
break;
case 'h':
long_usage(); /* and exit */
case 'i':
ignorecase = TRUE;
type_bits |= RE_IGNORECASE;
break;
case 'l':
names = TRUE;
break;
case 'n':
number = TRUE;
linecount_ptr = &linecount;
break;
case 'p':
path_mode = TRUE;
break;
case 's':
silent = TRUE;
break;
case 't':
touch = names = TRUE;
break;
case 'v':
nonmatch = TRUE;
break;
case 'x':
exact = TRUE;
break;
case 'z':
verbose = TRUE;
block_mode = TRUE;
break;
case 'e':
expr = optarg;
break;
case 'f':
expr = read_exp(optarg);
break;
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
leading_context = trailing_context = opt - '0';
break;
#ifdef TEST
case 'D':
debug++;
break;
#endif
default:
error("Invalid command line option, "
"dgrep -h for help", 2);
}
}
if (count || names || silent || touch)
leading_context = trailing_context = 0;
if (names || touch || silent) {
block_mode = FALSE;
verbose = FALSE;
}
return optind;
}
Exp* read_exp () {
AstTag tag = read_int();
switch(tag) {
case INT_EXP: {
int value = read_int();
return make_IntExp(value);
}
case NULL_EXP: {
return make_NullExp();
}
case PRINTF_EXP: {
char* format = read_string();
int nexps = read_int();
Exp** exps = read_exps(nexps);
return make_PrintfExp(format, nexps, exps);
}
case ARRAY_EXP: {
Exp* length = read_exp();
Exp* init = read_exp();
return make_ArrayExp(length, init);
}
case OBJECT_EXP: {
Exp* parent = read_exp();
int nslots = read_int();
SlotStmt** slots = read_slots(nslots);
return make_ObjectExp(parent, nslots, slots);
}
case SLOT_EXP: {
char* name = read_string();
Exp* exp = read_exp();
return make_SlotExp(name, exp);
}
case SET_SLOT_EXP: {
char* name = read_string();
Exp* exp = read_exp();
Exp* value = read_exp();
return make_SetSlotExp(name, exp, value);
}
case CALL_SLOT_EXP: {
char* name = read_string();
Exp* exp = read_exp();
int nargs = read_int();
Exp** args = read_exps(nargs);
return make_CallSlotExp(name, exp, nargs, args);
}
case CALL_EXP: {
char* name = read_string();
int nargs = read_int();
Exp** args = read_exps(nargs);
return make_CallExp(name, nargs, args);
}
case SET_EXP: {
char* name = read_string();
Exp* exp = read_exp();
return make_SetExp(name, exp);
}
case IF_EXP: {
Exp* pred = read_exp();
ScopeStmt* conseq = read_scopestmt();
ScopeStmt* alt = read_scopestmt();
return make_IfExp(pred, conseq, alt);
}
case WHILE_EXP: {
Exp* pred = read_exp();
ScopeStmt* body = read_scopestmt();
return make_WhileExp(pred, body);
}
case REF_EXP: {
char* name = read_string();
return make_RefExp(name);
}
default: {
printf("Expression with unrecognized tag: %d\n", tag);
exit(-1);
}
}
}