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labs/04/calculator_v2_linux_zoo/Makefile

@@ -1,11 +1,11 @@
-all:
-	yacc -d simplecalc.y
-	lex simplecalc.l
-	gcc y.tab.c lex.yy.c -o simplecalc
-
-clean:
-	rm -rf simplecalc
-	rm -rf lex.yy.c
-	rm -rf y.tab.c
-	rm -rf y.tab.h
-	rm -rf y.tab.h.gch
+all:
+        yacc -d simplecalc.y
+        lex simplecalc.l
+        gcc y.tab.c lex.yy.c -o simplecalc
+
+clean:
+        rm -rf simplecalc
+        rm -rf lex.yy.c
+        rm -rf y.tab.c
+        rm -rf y.tab.h
+        rm -rf y.tab.h.gch

labs/04/calculator_v2_linux_zoo/simplecalc.l

@@ -1,16 +1,25 @@
-%{
-#include "y.tab.h"
-extern int yylval;
-
-%}
-
-%option noyywrap
-
-
-%%
-[0-9]+                          { yylval = atoi(yytext); return NUMBER; }
-[a-z]                           { yylval = yytext[0]; return NAME; }
-[ \t] ;                         /* ignore whitespace */
-\n return 0;            /* logical EOF */
-. return yytext[0];
-%%
+%{
+#include <stdio.h>
+#include <stdlib.h>
+#include "y.tab.h"
+%}
+
+%option noyywrap
+
+%%
+"//".*                  { printf("COMMENT "); return '\n'; }
+"f"                     { printf("floatdcl "); return FLOATDCL; }
+[a-eghj-oq-z]           { printf("id "); yylval.sval = yytext[0]; return NAME;}
+"i"                     { printf("intdcl "); return INTDCL; }
+"="                     { printf("assign "); return '=';}
+[0-9]+                  { printf("inum "); yylval.dval = atoi(yytext); return NUMBER;}
+"+"                     { printf("plus "); return '+'; }
+"*"                     { printf("times "); return '*'; }
+"-"                     { printf("minus "); return '-'; }
+"/"                     { printf("divided" ); return '/'; }
+[0-9]+"."[0-9]+         { printf("fnum "); yylval.dval = atof(yytext); return NUMBER; }
+"p"                     { printf("print "); return PRINT;}
+[ \t] ;                 /* ignore whitespace */
+\n                      { return '\n'; }           /* logical EOF */
+.                       { return yytext[0]; }
+%%

labs/04/calculator_v2_linux_zoo/simplecalc.y

@@ -1,28 +1,65 @@
-%{
-#include <stdio.h>
-int yylex();
- void yyerror (char const *s) {
-   fprintf (stderr, "%s\n", s);
- }
-%}
-
-
-%token NAME NUMBER
-%%
-
-statement: NAME '=' expression          {printf("%c = %d\n", $1,$3);}
- | expression                                           {printf("= %d\n", $1);}
- ;
-expression: expression '+' NUMBER   { $$ = $1 + $3;}
- | expression '-' NUMBER            { $$ = $1 - $3;}
- | expression '*' NUMBER            { $$ = $1 * $3;}
- | '(' expression ')'                           {$$ = $2;}
- | NUMBER                           {$$ = $1;}
- ;
-
-%%
-
-int main(){
-        yyparse();
-        return 0;
-}
+%{
+#include <stdio.h>
+#include <stdlib.h>
+int yylex();
+void yyerror(const char *s) {
+    fprintf(stderr, "Error: %s\n", s);
+}
+
+double varvalue[26];
+%}
+
+%union {
+    double dval;
+    char sval;
+}
+
+%token <sval> NAME
+%token <dval> NUMBER
+%token FLOATDCL PRINT INTDCL
+%type <dval> expression
+
+%left '+' '-'
+%left '*' '/'
+
+%%
+
+input:
+    | input '\n'
+    | input statement '\n'
+    ;
+
+statement: FLOATDCL NAME        
+    | INTDCL NAME
+    | NAME '=' expression       { varvalue[$1 - 'a'] = $3; }
+    | PRINT NAME                { printf("%f\n", varvalue[$2 - 'a']); }
+    ;
+
+expression:
+      expression '+' expression   { $$ = $1 + $3; }
+    | expression '-' expression   { $$ = $1 - $3; }
+    | expression '*' expression   { $$ = $1 * $3; }
+    | expression '/' expression   { $$ = $1 / $3; }
+    | '(' expression ')'          { $$ = $2; }
+    | NUMBER                      { $$ = $1; }
+    | NAME                        { $$ = varvalue[$1 - 'a']; }
+    ;
+
+%%
+
+int main(int argc, char **argv) {
+    FILE *fd;
+
+    if (argc == 2) {
+        if (!(fd = fopen(argv[1], "r"))) {
+            perror("Error: ");
+            return -1;
+        }
+        yyset_in(fd);
+        yyparse();
+        fclose(fd);
+    } else {
+        printf("Usage: %s filename\n", argv[0]);
+    }
+    return 0;
+}