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-rw-r--r--src/primitives.d27
1 files changed, 27 insertions, 0 deletions
diff --git a/src/primitives.d b/src/primitives.d
index 0be6836..f577713 100644
--- a/src/primitives.d
+++ b/src/primitives.d
@@ -6,8 +6,21 @@ import src.stack;
import src.definition;
int[string] variables;
+bool drop_mode;
+
+bool evaluate(int value) {
+ return drop_mode;
+}
bool evaluate(string word) {
+ if ( drop_mode ) {
+ if ( word == "then" ) {
+ drop_mode = false;
+ }
+
+ return true;
+ }
+
switch ( word ) {
case "ยง":
src.definition.start;
@@ -25,6 +38,20 @@ bool evaluate(string word) {
stack.push(variables[name]);
}
return true;
+ case "if":
+ switch ( stack.pop.get!int ) {
+ case 0:
+ drop_mode = true;
+ return true;
+ case 1:
+ drop_mode = false;
+ return true;
+ default:
+ throw new Exception("invalid logic value");
+ }
+ case "then":
+ drop_mode = false;
+ return true;
case "+":
int b = stack.pop.get!int;
int a = stack.pop.get!int;