From 9bc47590c3c2108902e87a1059ad867d57357068 Mon Sep 17 00:00:00 2001
From: "Chloe M." <chloe@mirocom.org>
Date: Sat, 23 May 2026 07:59:47 -0400
Subject: core: lexer: Add keyword tokens

Signed-off-by: Chloe M. <chloe@mirocom.org>
---
 core/lexer.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

(limited to 'core')

diff --git a/core/lexer.c b/core/lexer.c
index 51e4d40..1d1e900 100644
--- a/core/lexer.c
+++ b/core/lexer.c
@@ -7,6 +7,7 @@
 #include <stdbool.h>
 #include <stdlib.h>
 #include <ctype.h>
+#include <string.h>
 #include "cescal/lexer.h"
 #include "cescal/log.h"
 #include "cescal/ptrbox.h"
@@ -135,6 +136,49 @@ lexer_scan_ident(struct cescal_state *state, char lc, struct token *res)
     return 0;
 }
 
+/*
+ * Checks if an identifier token is actually a keyword
+ *
+ * @state:   Compiler state
+ * @res:     Token result
+ */
+static void
+lexer_check_kw(struct cescal_state *state, struct token *res)
+{
+    if (state == NULL || res == NULL) {
+        return;
+    }
+
+    switch (*res->s) {
+    case 'p':
+        if (strcmp(res->s, "pub") == 0) {
+            res->type = TT_PUB;
+            return;
+        }
+
+        if (strcmp(res->s, "proc") == 0) {
+            res->type = TT_PROC;
+            return;
+        }
+
+        break;
+    case 'b':
+        if (strcmp(res->s, "begin") == 0) {
+            res->type = TT_BEGIN;
+            return;
+        }
+
+        break;
+    case 'e':
+        if (strcmp(res->s, "end") == 0) {
+            res->type = TT_END;
+            return;
+        }
+
+        break;
+    }
+}
+
 int
 lexer_nom(struct cescal_state *state, struct token *res)
 {
@@ -164,6 +208,7 @@ lexer_nom(struct cescal_state *state, struct token *res)
         return 0;
     default:
         if (lexer_scan_ident(state, c, res) == 0) {
+            lexer_check_kw(state, res);
             return 0;
         }
     }
-- 
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