analyzer.y

labs/03/analyzer.y

@@ -0,0 +1,139 @@
+%{
+
+#include <stdio.h>
+
+#include <stdlib.h>
+
+
+
+int yylex(void);
+
+void yyerror(const char *s);
+
+int yywrap(void);
+
+extern FILE *yyin;
+
+
+
+%}
+
+%token ARTICLE NOUN VERB PREP
+
+%%
+
+
+
+start: sentences '\n' { printf("PASS\n"); }
+
+
+
+sentences: /* empty */
+
+
+
+          | sentences sentence '\n'
+
+
+
+          ;
+
+
+
+sentence: noun_phrase verb_phrase { printf("PASS\n"); }
+
+
+
+        | noun_phrase { printf("PASS\n"); }
+
+
+
+        | verb_phrase { printf("PASS\n"); }
+
+
+
+        ;
+
+
+
+noun_phrase: ARTICLE NOUN
+
+
+
+           | ARTICLE NOUN prep_phrase
+
+
+
+           ;
+
+
+
+verb_phrase: VERB
+
+
+
+           | VERB noun_phrase
+
+
+
+           ;
+
+
+
+prep_phrase: PREP noun_phrase
+
+
+
+           ;
+
+
+
+%%
+
+
+
+void yyerror(const char *s) {
+
+    printf("FAIL\n");
+
+}
+
+int main(int argc, char *argv[]) {
+
+
+
+    if (argc != 2) {
+
+
+
+        fprintf(stderr, "Usage: %s <input_file>\n", argv[0]);
+
+
+
+        return 1;
+
+
+
+    }
+
+
+
+    FILE *file = fopen(argv[1], "r");
+
+    if (file == NULL) {
+
+        perror("Error opening file");
+
+        return 1;
+
+    }
+
+    yyin = file;  
+
+    yyparse();
+
+    fclose(file);
+
+    return 0;
+
+}