From 1a77b9cbd6e6470c885330076acce58200b90cf5 Mon Sep 17 00:00:00 2001
From: serr <sc7227484@gmail.com>
Date: Mon, 12 May 2025 23:15:03 +0300
Subject: [PATCH] add errors

---
 analyzers/polynomials/polynomials.l | 16 ++++++++++++----
 analyzers/polynomials/polynomials.y | 13 +++++--------
 2 files changed, 17 insertions(+), 12 deletions(-)

diff --git a/analyzers/polynomials/polynomials.l b/analyzers/polynomials/polynomials.l
index 184e197..5622847 100644
--- a/analyzers/polynomials/polynomials.l
+++ b/analyzers/polynomials/polynomials.l
@@ -4,6 +4,12 @@
 
 extern FILE *yyin;
 char allowed_variable = 0;
+int current_line_number = 1;
+
+void yyerror(const char *s) {
+    fprintf(stderr, "Error at line %i: %s\n", current_line_number, s);
+}
+
 %}
 
 %%
@@ -21,7 +27,7 @@ char allowed_variable = 0;
                   allowed_variable = yytext[0];
               }
               else if (yytext[0] != allowed_variable) {
-                  fprintf(stderr, "Error: Only variable '%c' is allowed in this expression\n", allowed_variable);
+                  yyerror("Bad variable in expression");
                   exit(1);
               }
               
@@ -36,9 +42,11 @@ char allowed_variable = 0;
             }
 
 [-+*^()]    { return yytext[0]; }
-[ \t\n]       ;
-\n          {  }
-.           { printf("unknown: %s\n", yytext); exit(0); }
+[ \t]       ;
+\n          { current_line_number++; }
+.           { yyerror("Unknown symbol"); 
+              exit(1); 
+            }
 %%
 
 int yywrap() { 
diff --git a/analyzers/polynomials/polynomials.y b/analyzers/polynomials/polynomials.y
index 7ddf92c..b71670f 100644
--- a/analyzers/polynomials/polynomials.y
+++ b/analyzers/polynomials/polynomials.y
@@ -4,11 +4,12 @@
 #include <stdlib.h>
 #include <string.h>
 
-void yyerror(const char *s);
+extern void yyerror(const char *s);
 int yylex();
 
 extern FILE *yyin;
 extern char allowed_variable;
+extern int current_line_number;
 
 typedef struct {
     char name;
@@ -86,7 +87,7 @@ expr:    NUMBER         { $$ = $1; }
                 $$ = copy_poly(var_poly);
             } else {
                 yyerror("Undefined variable");
-                YYERROR;
+                exit(1);
             }
         }
       | '-' expr %prec UMINUS { 
@@ -114,12 +115,12 @@ expr:    NUMBER         { $$ = $1; }
       | expr '^' expr    { 
             if ($3.size != 1 || $3.terms[0].exponent != 0) {
                 yyerror("Exponent must be constant");
-                YYERROR;
+                exit(1);
             }
             int degree = $3.terms[0].coefficient;
             if (degree < 0) {
                 yyerror("Negative exponents not supported");
-                YYERROR;
+                exit(1);
             }
             $$ = deg_poly(&$1, degree);
             free_polynomial(&$1);
@@ -129,10 +130,6 @@ expr:    NUMBER         { $$ = $1; }
       ;
 %%
 
-void yyerror(const char *s) {
-    fprintf(stderr, "ERROR: %s\n", s);
-}
-
 int main(int argc, char *argv[]) {
     if (argc < 2) {
         fprintf(stderr, "Usage: %s input_file\n", argv[0]);