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-rw-r--r--src/primitives/eval.d48
-rw-r--r--src/primitives/impl.d119
2 files changed, 167 insertions, 0 deletions
diff --git a/src/primitives/eval.d b/src/primitives/eval.d
new file mode 100644
index 0000000..3f91e80
--- /dev/null
+++ b/src/primitives/eval.d
@@ -0,0 +1,48 @@
+module src.primitives.eval;
+
+import src.primitives.impl;
+
+bool evaluate(int value) {
+ return drop_mode;
+}
+
+bool evaluate(string word) {
+ if ( drop_mode ) {
+ if ( word == "then" ) {
+ return conditional_end;
+ } else {
+ return true;
+ }
+ }
+
+ switch ( word ) {
+ case "ยง":
+ return definition_start;
+ case "$":
+ return binary_op_variable_bind;
+ case "@":
+ return unary_op_variable_resolve;
+ case "if":
+ return conditional_start;
+ case "then":
+ return conditional_end;
+ case "+":
+ return binary_op_add;
+ case "*":
+ return binary_op_multiply;
+ case "/":
+ return binary_op_divide;
+ case "%":
+ return binary_op_modulo;
+ case ".":
+ return unary_op_io_print;
+ case "pop":
+ return unary_op_stack_pop;
+ case "dup":
+ return unary_op_stack_dup;
+ case "swp":
+ return binary_op_stack_swp;
+ default:
+ return false;
+ }
+}
diff --git a/src/primitives/impl.d b/src/primitives/impl.d
new file mode 100644
index 0000000..4ec9019
--- /dev/null
+++ b/src/primitives/impl.d
@@ -0,0 +1,119 @@
+module src.primitives.impl;
+
+import std.stdio;
+
+import src.stack;
+import src.definition;
+
+int[string] variables;
+bool drop_mode;
+
+bool definition_start() {
+ src.definition.start;
+ return true;
+}
+
+bool binary_op_variable_bind() {
+ string name = stack.pop.get!string;
+ int value = stack.pop.get!int;
+
+ variables[name] = value;
+ return true;
+}
+
+bool unary_op_variable_resolve() {
+ string name = stack.pop.get!string;
+
+ if ( name in variables ) {
+ stack.push(variables[name]);
+ }
+
+ return true;
+}
+
+bool conditional_start() {
+ 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");
+ }
+}
+
+bool conditional_end() {
+ drop_mode = false;
+ return true;
+}
+
+bool binary_op_add() {
+ int b = stack.pop.get!int;
+ int a = stack.pop.get!int;
+
+ stack.push(a + b);
+
+ return true;
+}
+
+bool binary_op_multiply() {
+ int b = stack.pop.get!int;
+ int a = stack.pop.get!int;
+
+ stack.push(a * b);
+
+ return true;
+}
+
+bool binary_op_divide() {
+ int b = stack.pop.get!int;
+ int a = stack.pop.get!int;
+
+ if ( b == 0 ) {
+ throw new Exception("division by 0 undefined");
+ } else {
+ stack.push(a / b);
+ }
+
+ return true;
+}
+
+bool binary_op_modulo() {
+ int b = stack.pop.get!int;
+ int a = stack.pop.get!int;
+
+ if ( b == 0 ) {
+ throw new Exception("modulo 0 undefined");
+ } else {
+ stack.push(a % b);
+ }
+
+ return true;
+}
+
+bool unary_op_io_print() {
+ writeln(stack.top);
+ return true;
+}
+
+bool unary_op_stack_pop() {
+ stack.pop;
+ return true;
+}
+
+bool unary_op_stack_dup() {
+ stack.push(stack.top);
+ return true;
+}
+
+bool binary_op_stack_swp() {
+ auto b = stack.pop;
+ auto a = stack.pop;
+
+ stack.push(b);
+ stack.push(a);
+
+ return true;
+}