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dup

This commit is contained in:
Simon Forman 2023-03-18 12:43:30 -07:00
parent 1600fa210c
commit 83a5bc46df
1 changed files with 13 additions and 1 deletions
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14
implementations/uvm-ncc/joy.c
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@ -572,6 +572,7 @@ joy_eval(char *symbol, u32 stack, u32 expression)
MATCH("clear") return (u64)expression;
MATCH("swaack") { stack = swaack(stack); }
else MATCH("pop") { stack = pop(stack); }
else MATCH("dup") { stack = dup(stack); }
else MATCH("stack") { stack = cons(stack, stack); }
//else MATCH("") { stack = (stack); }
CHECK_ERROR
@ -600,6 +601,17 @@ pop(u32 stack)
}
u32
dup(u32 stack)
{
if (!stack) {
error = NOT_ENOUGH_VALUES_ON_STACK;
return 0;
}
return cons(head(stack), stack);
}
u32
joy(u32 stack, u32 expression)
{
@ -649,7 +661,7 @@ main()
print_endl();
*/
u32 expression = text_to_expression("1 2 3 [4 5 6] swaack pop 23 stack 18");
u32 expression = text_to_expression("1 2 3 stack dup swaack");
//u32 expression = text_to_expression("1 2 3 clear 4 5 6");
//u32 expression = text_to_expression(" 1[2[true 3][aa[aa bb] aa bb cc]bob]false[]bob 3[4] ga[]ry");
print_joy_list(expression);