3 files changed, 82 insertions, 0 deletions
diff --git a/src/utils/file.c b/src/utils/file.c
index c2dd614..f2244bf 100644
--- a/src/utils/file.c
+++ b/src/utils/file.c
@@ -5,6 +5,11 @@
 #include <stddef.h>
 #include <stdio.h>
 
+size_t fileCodes_capacity = 0;
+char **fileCodes = NULL;
+const char **fileCodes_names = 0;
+size_t fileCodes_length = 0;
+
 char *readWholeFile(const char *filePath) {
   FILE *file = fopen(filePath, "r");
 
@@ -23,5 +28,16 @@ char *readWholeFile(const char *filePath) {
 
   fclose(file);
 
+  if (fileCodes_capacity == fileCodes_length) {
+    fileCodes_capacity += fileCodes_capacity / 2 + 1;
+    fileCodes =
+        a404m_realloc(fileCodes, fileCodes_capacity * sizeof(*fileCodes));
+    fileCodes_names = a404m_realloc(
+        fileCodes_names, fileCodes_capacity * sizeof(*fileCodes_names));
+  }
+  fileCodes[fileCodes_length] = str;
+  fileCodes_names[fileCodes_length] = filePath;
+  fileCodes_length += 1;
+
   return str;
 }
diff --git a/src/utils/log.c b/src/utils/log.c
index f54394a..e84f3b4 100644
--- a/src/utils/log.c
+++ b/src/utils/log.c
@@ -1,8 +1,10 @@
 #include "log.h"
 
 #include <stdarg.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 
 void _printLogBack(const char *format, const char *file, int line, ...) {
   va_list args;
@@ -13,3 +15,64 @@ void _printLogBack(const char *format, const char *file, int line, ...) {
   printf("\e[0;31mError: %s at compiler %s:%d\e[0m\n", errorStr, file, line);
   free(errorStr);
 }
+
+extern char **fileCodes;
+extern const char **fileCodes_names;
+extern size_t fileCodes_length;
+
+void _printErrorBack(const char *format, const char *file, int line,
+                     char *begin, char *end, ...) {
+  va_list args;
+  va_start(args, end);
+  char *errorStr;
+  vasprintf(&errorStr, format, args);
+
+  size_t file_index = SIZE_MAX;
+  for (size_t i = 0; i < fileCodes_length; ++i) {
+    char *fileCode_begin = fileCodes[i];
+    char *fileCode_end = fileCodes[i] + strlen(fileCodes[i]);
+    if (begin >= fileCode_begin && end <= fileCode_end) {
+      file_index = i;
+      break;
+    }
+  }
+
+  const char firstColor[] = "\e[0;36m";
+  const char secondColor[] = "\e[0;31m";
+  fprintf(stderr, "%sError: %s at compiler %s:%d\e[0m\n", firstColor, errorStr,
+          file, line);
+  free(errorStr);
+
+  if (file_index == SIZE_MAX) {
+    return;
+  }
+
+  size_t file_line = 1;
+  char *file_line_begin = fileCodes[file_index];
+  char *file_line_end = fileCodes[file_index];
+  for (char *iter = fileCodes[file_index]; *iter != '\0'; ++iter) {
+    if (*iter == '\n') {
+      if (iter <= begin) {
+        file_line_begin = iter + 1;
+      } else if (iter >= end) {
+        file_line_end = iter;
+      }
+      if (iter <= end) {
+        ++file_line;
+      }
+    }
+  }
+
+  fprintf(stderr, "\e%sAt %s:%ld\n", firstColor, fileCodes_names[file_index],
+          file_line);
+
+  for (char *iter = file_line_begin; iter < file_line_end; ++iter) {
+    if (iter == begin) {
+      fprintf(stderr, "%s", secondColor);
+    } else if (iter == end) {
+      fprintf(stderr, "%s", firstColor);
+    }
+    fprintf(stderr, "%c", *iter);
+  }
+  fprintf(stderr, "\e[0m");
+}
diff --git a/src/utils/log.h b/src/utils/log.h
index 620b2a3..4057394 100644
--- a/src/utils/log.h
+++ b/src/utils/log.h
@@ -1,7 +1,10 @@
 #pragma once
 
 #define printLog(format,...) _printLogBack(format, __FILE_NAME__, __LINE__, ## __VA_ARGS__)
+#define printError(format,begin,end,...) _printErrorBack(format, __FILE_NAME__, __LINE__, begin, end, ## __VA_ARGS__)
 
 #define UNREACHABLE printLog("Unreachable");exit(1)
 
 extern void _printLogBack(const char *format, const char *file, int line, ...);
+
+extern void _printErrorBack(const char *format, const char *file, int line, char *begin, char *end, ...);