A01632621-homework-07

chatbot.l

@@ -0,0 +1,28 @@
+%{
+#include "y.tab.h"
+%}
+
+%%
+
+hello           { return HELLO; }
+hi              { return HELLO; }
+hey             { return HELLO; }
+goodbye         { return GOODBYE; }
+bye             { return GOODBYE; }
+time            { return TIME; }
+weather		{ return WEATHER; }
+What's[' ']the[' ']weather[' ']like\?  { return WEATHER; } /* The question now starts with a capital letter and ends with a question mark  */
+What[' ']time[' ']is[' ']it\?  { return TIME; } /* The question now starts with a capital letter and ends with a question mark  */
+What[' ']is[' ']your[' ']name\? { return NAME; }
+What's[' ']your[' ']name\? { return NAME; }
+How[' ']are[' ']you\? { return FEELING;  }
+joke		{ return JOKE  ; }
+Tell[' ']me[' ']a[' ']joke    { return JOKE   ; }
+\n              { return 0; }  /* End of input on newline */
+.               { return yytext[0]; }
+
+%%
+
+int yywrap() {
+    return 1;
+}

chatbot.y

@@ -0,0 +1,92 @@
+%{
+#include <stdio.h>
+#include <time.h>
+#include <stdlib.h>
+#include <string.h>
+
+void yyerror(const char *s);
+int yylex(void);
+%}
+
+%token HELLO GOODBYE TIME NAME FEELING WEATHER JOKE
+
+%%
+
+chatbot : greeting
+        | farewell
+        | query
+	| name
+	| feeling
+	| weather       
+	| joke
+	;
+
+greeting : HELLO { printf("Chatbot: Hello! How can I help you today?\n"); }
+         ;
+
+farewell : GOODBYE { printf("Chatbot: Goodbye! Have a great day!\n"); }
+         ;
+
+query : TIME { 
+            time_t now = time(NULL);
+            struct tm *local = localtime(&now);
+            printf("Chatbot: The current time is %02d:%02d.\n", local->tm_hour, local->tm_min);
+         }
+       ;
+
+name : NAME { printf("Chatbot: My name is Rotceh.\n"); }
+     ;
+
+feeling : FEELING { printf("Chatbot: I'm doing well, thanks for asking!\n"); }
+        ;
+
+weather : WEATHER { 
+		printf("Chatbot: The weather of the place you live looks like the following:\n");
+		/* 
+		Makes a request to wttr.in in silent mode to prevent from
+		displaying the progress meter or error messages, and then 
+		passes the result of the weather information to the sed 
+		command and with the "-n" option it suppresses the printing 
+		of every line that it reads and then it just prints the first 
+		line and also prints from lines 8 to 17. 
+		*/ 
+		system("curl -s wttr.in | sed -n '1p;8,17p'");
+		printf("\n");
+	  }
+	; 
+
+joke : JOKE {
+	char jokes[5][69] = {"What do you call a pile of cats? A meow-ntain.", 
+			     "Why did the bicycle fall over? Because it was two tired.",
+			     "What do you call a fish without an eye? Fsh.",
+			     "How many tickles does it take to make an octopus laugh? Ten-tickles.",
+			     "What do math books wear under their covers? Alge-bras."};
+	srand(time(NULL));
+	/* 
+	Modulus operator is used on rand() % 5, and 5 is used to ensure
+	that the result of this operation is a number in the range
+	from 0 - 4 with 0 and 4 being inclusive in this range, this is
+	done so a valid index can be used to access an
+	element from the array of strings called jokes. 
+	*/
+	int pseudo_random_index = rand() % 5;
+	char random_joke[69];
+	strcpy(random_joke, jokes[pseudo_random_index]);
+	printf("Chatbot: %s\n", random_joke);	
+       }
+     ;
+
+%%
+
+int main() {
+    // Added a line break at the start of the Chatbot's message
+    printf("\nChatbot: Hi! You can greet me, ask me for the time, ask me what's my name, ask me what's the weather like where you live, request me to tell you a joke 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");
+}