A01634185-homework-07

labs/04/lab_04.l

@@ -0,0 +1,41 @@
+%{
+#include <stdio.h>
+%}
+
+%option noyywrap
+
+%%
+"//".*                  { printf("comment "); }
+"f"                     { printf("floatdcl "); }
+"i"                     { printf("intdcl "); }
+"p"                     { printf("print "); }
+"+"                     { printf("plus "); }
+"-"                     { printf("minus "); }
+"/"                     { printf("division "); }
+"*"                     { printf("times "); }
+"="                     { printf("assign "); }
+[0-9]+                  { printf("integer "); }
+[0-9]+"."[0-9]+         { printf("fnum "); }
+[a-eghj-oq-z]           { printf("id "); }
+[ \t]+                  /* ignore whitespace */
+.                       /* ignore other characters */
+%%
+
+int main(int argc, char **argv) {
+    FILE    *fd;
+
+    if (argc == 2)
+    {
+        if (!(fd = fopen(argv[1], "r")))
+        {
+            perror("Error: ");
+            return (-1);
+        }
+        yyset_in(fd);
+        yylex();
+        fclose(fd);
+    }
+    else
+        printf("Usage: a.out filename\n");
+    return (0);
+}

labs/07/chatbot.l

@@ -0,0 +1,29 @@
+%{
+#include "y.tab.h"
+%}
+
+%%
+
+hello           { return HELLO; }
+hi              { return HELLO; }
+hey             { return HELLO; }
+goodbye         { return GOODBYE; }
+bye             { return GOODBYE; }
+time            { return TIME; }
+what[' ']is[' ']the[' ']time[' ']in[' ']Mexico     { return TIME; }
+what[' ']time[' ']is[' ']it[' ']in[' ']Mexico      { return TIME; }
+what[' ']is[' ']the[' ']time[' ']in[' ']Japan     { return TIMEJ; }
+what[' ']time[' ']is[' ']it[' ']in[' ']Japan      { return TIMEJ; }
+how[' ']are[' ']you              {return STATUS; }
+what[' ']is[' ']your[' ']name    {return NAME; }
+name            { return NAME; }
+
+\n              { return 0; }  /* End of input on newline */
+
+.               { return yytext[0]; }
+
+%%
+
+int yywrap() {
+    return 1;
+}

labs/07/chatbot.y

@@ -0,0 +1,68 @@
+
+%{
+#include <stdio.h>
+#include <time.h>
+
+void yyerror(const char *s);
+int yylex(void);
+%}
+
+%token HELLO GOODBYE TIME STATUS NAME TIMEJ
+
+%%
+
+chatbot : greeting
+        | farewell
+        | querytime
+        | wellbeing
+        | name
+        ;
+
+greeting : HELLO { printf("Chatbot: Hey Bro! How can I help you today?\n"); }
+         ;
+
+farewell : GOODBYE { printf("Chatbot: Goodbye! Have a great day!\n"); }
+         ;
+
+querytime : TIME {
+            /*time zone established in Mexico*/
+            setenv("TZ", "America/Mexico_City", 1);
+            tzset();
+            time_t now = time(NULL);
+            struct tm *local = localtime(&now);
+            printf("Chatbot: The current time in Mexico is %02d:%02d.\n", local->tm_hour, local->tm_min);
+         }
+       ;
+wellbeing : STATUS {
+            /*Response to status question*/
+            printf("Chatbot: I'm doing well, thanks for asking\n");
+         }
+        ;
+name : NAME {
+            /*Response to name question*/
+            printf ("Chatbot: I'm BeatBot\n");
+         }
+        ;
+querytime : TIMEJ {
+            /*time zone established in Japan*/
+            setenv("TZ", "Asia/Tokyo", 1);
+            tzset();
+            time_t now = time(NULL);
+            struct tm *local = localtime(&now);
+            printf("Chatbot: The current time in Japan is %02d:%02d.\n", local->tm_hour, local->tm_min);
+         }
+       ;
+
+%%
+
+int main() {
+    printf("Chatbot: Hi! I'm BeatBot. You can ask me for the time in Mexico and Japan, my name, greet me, or say goodbye.\n");
+    while (yyparse() == 0) {
+        // Loop until end of input
+    }
+    return 0;
+}
+
+void yyerror(const char *s) {
+    fprintf(stderr, "Chatbot: I didn't understand that.\n");
+}