*/ void Do_Command(REBVAL *value)
/*
** Evaluates the arguments for a command function and creates
** a resulting stack frame (struct or object) for command processing.
**
** A command value consists of:
** args - same as other funcs
** spec - same as other funcs
** body - [ext-obj func-index]
**
***********************************************************************/
{
REBVAL *val = BLK_HEAD(VAL_FUNC_BODY(value));
REBEXT *ext;
REBCNT cmd;
REBCNT argc;
REBCNT n;
RXIFRM frm; // args stored here
// All of these were checked above on definition:
val = BLK_HEAD(VAL_FUNC_BODY(value));
cmd = (int)VAL_INT64(val+1);
ext = &Ext_List[VAL_I32(VAL_OBJ_VALUE(val, 1))]; // Handler
// Copy args to command frame (array of args):
RXA_COUNT(&frm) = argc = SERIES_TAIL(VAL_FUNC_ARGS(value))-1; // not self
if (argc > 7) Trap0(RE_BAD_COMMAND);
val = DS_ARG(1);
for (n = 1; n <= argc; n++, val++) {
RXA_TYPE(&frm, n) = Reb_To_RXT[VAL_TYPE(val)];
frm.args[n] = Value_To_RXI(val);
}
// Call the command:
n = ext->call(cmd, &frm, 0);
val = DS_RETURN;
switch (n) {
case RXR_VALUE:
RXI_To_Value(val, frm.args[1], RXA_TYPE(&frm, 1));
break;
case RXR_BLOCK:
RXI_To_Block(&frm, val);
break;
case RXR_UNSET:
SET_UNSET(val);
break;
case RXR_NONE:
SET_NONE(val);
break;
case RXR_TRUE:
SET_TRUE(val);
break;
case RXR_FALSE:
SET_FALSE(val);
break;
case RXR_ERROR:
default:
SET_UNSET(val);
}
}
x*/ void RXI_To_Block(RXIFRM *frm, REBVAL *out) {
/*
***********************************************************************/
REBCNT n;
REBSER *blk;
REBVAL *val;
REBCNT len;
blk = Make_Array(len = RXA_COUNT(frm));
for (n = 1; n <= len; n++) {
val = Alloc_Tail_Array(blk);
RXI_To_Value(val, frm->args[n], RXA_TYPE(frm, n));
}
Val_Init_Block(out, blk);
}
*/ void Do_Commands(REBSER *cmds, void *context)
/*
** Evaluate a block of commands as efficiently as possible.
** The arguments to each command must already be reduced or
** use only variable lookup.
**
** Returns the last evaluated value, if provided.
**
***********************************************************************/
{
REBVAL *blk;
REBCNT index = 0;
REBVAL *set_word = 0;
REBVAL *cmd_word;
REBSER *words;
REBVAL *args;
REBVAL *val;
REBVAL *func;
RXIFRM frm; // args stored here
REBCNT n;
REBEXT *ext;
REBCEC *ctx;
if ((ctx = context)) ctx->block = cmds;
blk = BLK_HEAD(cmds);
while (NOT_END(blk)) {
// var: command result
if IS_SET_WORD(blk) {
set_word = blk++;
index++;
};
// get command function
if (IS_WORD(cmd_word = blk)) {
// Optimized var fetch:
n = VAL_WORD_INDEX(blk);
if (n > 0) func = FRM_VALUES(VAL_WORD_FRAME(blk)) + n;
else func = Get_Var(blk); // fallback
} else func = blk;
if (!IS_COMMAND(func)) Trap2(RE_EXPECT_VAL, Get_Type_Word(REB_COMMAND), blk);
// Advance to next value
blk++;
if (ctx) ctx->index = index; // position of function
index++;
// get command arguments and body
words = VAL_FUNC_WORDS(func);
RXA_COUNT(&frm) = SERIES_TAIL(VAL_FUNC_ARGS(func))-1; // not self
// collect each argument (arg list already validated on MAKE)
n = 0;
for (args = BLK_SKIP(words, 1); NOT_END(args); args++) {
//Debug_Type(args);
val = blk++;
index++;
if (IS_END(val)) Trap2(RE_NO_ARG, cmd_word, args);
//Debug_Type(val);
// actual arg is a word, lookup?
if (VAL_TYPE(val) >= REB_WORD) {
if (IS_WORD(val)) {
if (IS_WORD(args)) val = Get_Var(val);
}
else if (IS_PATH(val)) {
if (IS_WORD(args)) val = Get_Any_Var(val); // volatile value!
}
else if (IS_PAREN(val)) {
val = Do_Blk(VAL_SERIES(val), 0); // volatile value!
}
// all others fall through
}
// check datatype
if (!TYPE_CHECK(args, VAL_TYPE(val)))
Trap3(RE_EXPECT_ARG, cmd_word, args, Of_Type(val));
// put arg into command frame
n++;
RXA_TYPE(&frm, n) = Reb_To_RXT[VAL_TYPE(val)];
frm.args[n] = Value_To_RXI(val);
}
// Call the command (also supports different extension modules):
func = BLK_HEAD(VAL_FUNC_BODY(func));
n = (REBCNT)VAL_INT64(func + 1);
ext = &Ext_List[VAL_I32(VAL_OBJ_VALUE(func, 1))]; // Handler
n = ext->call(n, &frm, context);
val = DS_RETURN;
switch (n) {
case RXR_VALUE:
RXI_To_Value(val, frm.args[1], RXA_TYPE(&frm, 1));
break;
case RXR_BLOCK:
RXI_To_Block(&frm, val);
break;
case RXR_UNSET:
SET_UNSET(val);
break;
case RXR_NONE:
SET_NONE(val);
break;
case RXR_TRUE:
SET_TRUE(val);
break;
case RXR_FALSE:
SET_FALSE(val);
break;
case RXR_ERROR:
default:
SET_UNSET(val);
}
if (set_word) {
Set_Var(set_word, val);
set_word = 0;
}
}
}
