From b12b8c9cb7a4d36fa6c0e2e9ec14ce5dfba6f78f Mon Sep 17 00:00:00 2001
From: David Phillips <david@sighup.nz>
Date: Thu, 28 Dec 2017 16:30:11 +1300
Subject: Support first working prototype without nested gates

---
 gate.c   | 34 +++++++++++++++++++++++++++++++++-
 gate.h   |  1 +
 parser.c |  9 +++++++++
 3 files changed, 43 insertions(+), 1 deletion(-)

diff --git a/gate.c b/gate.c
index fb5ff41..67d9c08 100644
--- a/gate.c
+++ b/gate.c
@@ -125,6 +125,38 @@ gate_dump(void) {
 
 	emit_info("Gates:\n");
 	for (i = 0; i < gate_count; i++) {
-		emit_info("gate '%s'\n", gates[i].name);
+		emit_info("gate '%s': %s\n", gates[i].name, gates[i].output == LOGIC_HIGH ? "HIGH" : "LOW");
 	}
 }
+
+int
+gate_set_input(char *name, enum BINARY value) {
+	struct gate *g = NULL;
+	
+	if (NULL == (g = gate_get_input_by_name(name))) {
+		emit_error("No such input %s", name);
+		return 1;
+	}
+
+	g->output = value;
+
+	return 0;
+}
+
+void gate_update() {
+	size_t i = 0;
+	struct gate *g = NULL;
+	enum BINARY in1 = LOGIC_LOW;
+	enum BINARY in2 = LOGIC_LOW;
+
+	/* FIXME should be input->output flow path */
+	/* FIXME data flow doesn't matter yet because gate chaining isn't allowed */
+
+	for (i = 0; i < gate_count; i++) {
+		g = &gates[i];
+		in1 = g->in1->output;
+		in2 = g->in2->output;
+		g->output = (g->operation)(in1, in2);
+	}
+}
+
diff --git a/gate.h b/gate.h
index 1838913..86b2e48 100644
--- a/gate.h
+++ b/gate.h
@@ -25,5 +25,6 @@ int gate_add(char *name, enum BINARY (*operation)(enum BINARY, enum BINARY), str
 int tick(void);
 void gate_init(void);
 void gate_dump(void);
+int gate_set_input(char *name, enum BINARY value);
 
 #endif
diff --git a/parser.c b/parser.c
index 19610b9..a34744a 100644
--- a/parser.c
+++ b/parser.c
@@ -187,6 +187,15 @@ int main(void) {
 	}
 	gate_dump();
 
+	gate_set_input("a", LOGIC_LOW);
+	gate_set_input("b", LOGIC_LOW);
+
+	gate_update();
+
+	gate_dump();
+
+
+
 	return 0;
 }
 
-- 
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