From ce2af6682f399131acb14f6bf1c025b83631b12b Mon Sep 17 00:00:00 2001
From: Leon Krieg <info@madcow.dev>
Date: Tue, 27 Aug 2024 17:22:34 +0200
Subject: [PATCH] Start implementing proper parser state machine

---
 src/parser.c | 59 ++++++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 48 insertions(+), 11 deletions(-)

diff --git a/src/parser.c b/src/parser.c
index 736956e..7912826 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -2,18 +2,51 @@
 #include "serial.h"
 #include "parser.h"
 
-// # Supported Commands
-//   (Optional decimal point for numbers)
-//   - START
-//   - RESET
-//   - STOP
-//   - SET TEMP 20
-//   - SET DEWP 60.0
+/*
+ * # Supported Commands
+ * (Optional decimal point for numbers)
+ *
+ * - RUN
+ * - STOP
+ * - TEMP 20
+ * - DEWP 60.0
+ */
 
 static int state;
 
+#define PARSE_IDLE          0
+#define PARSE_CMD_RUN       1
+#define PARSE_CMD_STOP      2
+#define PARSE_CMD_SET_TEMP  3
+#define PARSE_CMD_SET_DEWP  4
+
 void CMD_Parse(char ch)
 {
+	#if 0
+	switch (state) {
+	case PARSE_IDLE:
+		if (ch == 'R')
+			state = PARSE_CMD_RUN;
+		else if (ch == 'S')
+			state = PARSE_CMD_STOP;
+		else if (ch == 'T')
+			state = PARSE_CMD_SET_TEMP;
+		else if (ch == 'D')
+			state = PARSE_CMD_SET_DEWP;
+		}
+		break;
+	case PARSE_CMD_RUN:
+		break;
+	case PARSE_CMD_STOP:
+		break;
+	case PARSE_CMD_SET_TEMP:
+		break;
+	case PARSE_CMD_SET_DEWP:
+		break;
+	}
+	#endif
+
+	// Placeholder
 	switch (state) {
 	case 0:
 		if (ch == 't')
@@ -24,21 +57,25 @@ void CMD_Parse(char ch)
 			state = 2;
 		else
 			state = 0;
+		break;
 	case 2:
 		if (ch == 's')
 			state = 3;
 		else
 			state = 0;
+		break;
 	case 3:
 		if (ch == 't')
 			state = 4;
 		else
 			state = 0;
+		break;
 	case 4:
 		if (ch == '\n') {
-			USART_Printf("[CORE] Parsed 'test'!\r\n");
-			state = 0;
-		} else
-			state = 0;
+			// XXX: Just so the web server can show something...
+			USART_Printf("[CORE] Parsed 'CMD_SET_TEMP' token.\r\n");
+			USART_Printf("[CORE] Parsed 'CMD_SET_DEWP' token.\r\n");
+		}
+		state = 0;
 	}
 }