diff --git a/bfpcompiler/include/analyzer.h b/bfpcompiler/include/analyzer.h
index 058a71f..38a80cd 100644
--- a/bfpcompiler/include/analyzer.h
+++ b/bfpcompiler/include/analyzer.h
@@ -1,6 +1,16 @@
 #ifndef ANALYZER_H
 #define ANALYZER_H
 
+#include <stdio.h>
+#include <stdlib.h>
 
+/**
+ *	@name analyze
+ *	@return int
+ *	@brief Analyze the tokens syntax. Return -1 on error and 1 on warning, 0 else.
+ *
+ *	@param char* tokens:	analyze_tokens
+ */
+int analyze (char* tokens);
 
 #endif//ANALYZER_H
diff --git a/bfpcompiler/src/analyzer.c b/bfpcompiler/src/analyzer.c
index 5a16681..fbe0720 100644
--- a/bfpcompiler/src/analyzer.c
+++ b/bfpcompiler/src/analyzer.c
@@ -1 +1,45 @@
 #include "../include/analyzer.h"
+
+/**
+ *	@name analyze
+ *	@return int
+ *  @brief Check for errors and warnings.
+ *
+ *	@param char* token
+ */
+int analyze (char* token) {
+    int rv = 0;
+    int position = 0;
+
+    for (char* cursor = token; *cursor; cursor++) {
+
+        /* Analyze form */
+        if (*cursor == '[') {
+            rv += 1;
+        } else if (*cursor == ']') {
+            rv -= 1;
+        }
+
+        /* Check value for errors. */
+        if (rv < 0) {
+            (void)printf("Error on token %d\n", position);
+            perror("ERROR: Closing bracket without opening bracket!");
+            rv = EXIT_FAILURE;
+            break;
+        }
+
+        /* check for nested loops */
+        if (rv > 1) {
+            (void)printf("Warning on token %d\n", position);
+            (void)printf("WARNING: Nested loops are not supported on all versions of the target device!\n");
+        }
+    }
+
+    if (rv > 0) {
+        (void)printf("There are %d loops without end!\n", rv);
+        perror("ERROR: Loop not closed!");
+        rv = EXIT_FAILURE;
+    }
+
+    return rv;
+}