PRACTICA 3 - DIEGO ITURBE BRAVO A01708272

labs/03/COMMNDSLEXYACC.txt

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+yacc -d analizer.y
+lex analizer.l
+gcc y.tab.c lex.yy.c -ly -ll -o analizer

labs/03/analizer.l

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+%{
+#include <stdio.h>
+#include "y.tab.h"
+%}
+%%
+a|the	{ yylval.sval = strdup(yytext); return ARTICLE; }
+boy|girl|flower	{ yylval.sval = strdup(yytext); return NOUN; }
+touches|likes|sees	{ yylval.sval = strdup(yytext); return VERB; }
+with	{ return PREP; }
+[ \t] ; 		
+\n { return 0; };	
+%%
+
+int main(int argc, char **argv) {
+    FILE    *fd;
+
+    if (argc == 2)
+    {
+        if (!(fd = fopen(argv[1], "r")))
+        {
+            perror("Error: ");
+            return (-1);
+        }
+
+        yyin = fd;
+
+
+        char ch;
+    int lines = 0;
+         // Counting the total number of lines in the file
+        while ((ch = fgetc(fd)) != EOF) {
+            if (ch == '\n') {
+                lines++;
+            }
+        }
+
+        fseek(fd, 0, SEEK_SET);
+	for(int i=0;i<lines;i++)
+	yyparse();
+
+
+        fclose(fd);
+
+
+    }
+    else
+        printf("Usage: a.out filename\n");
+    return (0);
+}
+
+
+

labs/03/analizer.y

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+%{
+#include <stdio.h>
+int yylex();
+void yyerror(const char *s);
+%}
+
+%union {
+ char *sval;
+ }
+
+%token <sval> ARTICLE NOUN VERB PREP
+%type <sval> nounphrase verbphrase prepphrase complexnoun complexverb sentence
+
+
+%%
+
+input: sentence	{printf("PASS\n");}
+ ;
+sentence: nounphrase verbphrase
+ ;
+nounphrase: complexnoun	
+	| complexnoun prepphrase        
+ ; 
+verbphrase: complexverb
+ ;
+prepphrase: PREP complexnoun	    
+ ;
+complexnoun: ARTICLE NOUN	    
+ ;
+complexverb: VERB
+	| VERB nounphrase    
+ ;
+
+%%
+
+

labs/03/test.txt

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+a boy sees
+the boy sees a flower
+a girl with a flower likes the boy
+a flower sees a flower
+dada
+the boy