A01541526-homework-07

labs/07/Makefile

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+all:
+        yacc -d chatbot.y
+        lex chatbot.l
+        gcc y.tab.c lex.yy.c -o chatbot
+
+clean:
+        rm -rf chatbot
+        rm -rf lex.yy.c
+        rm -rf y.tab.c
+        rm -rf y.tab.h
+        rm -rf y.tab.h.gch

labs/07/chatbot.l

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+%{
+#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    { return TIME; }
+what[' ']time[' ']is[' ']it     { return TIME; }
+weather                         { return WEATHER; }
+give[' ']me[' ']the[' ']weather { return WEATHER; }
+what[' ']is[' ']the[' ']weather {return WEATHER; }
+how[' ']are[' ']you             { return HOWAREYOU; }
+what[' ']are[' ']you[' ']doing  {return WRYD; }
+sing[' ']a[' ']song             {return SINGREQUEST; }
+\n              { return 0; }  /* End of input on newline */
+
+.               { return yytext[0]; }
+
+%%
+
+int yywrap() {
+    return 1;
+}

labs/07/chatbot.y

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+%{
+#include <stdio.h>
+#include <time.h>
+
+void yyerror(const char *s);
+int yylex(void);
+%}
+
+%token HELLO GOODBYE TIME WEATHER HOWAREYOU WRYD SINGREQUEST
+
+%%
+
+chatbot : greeting
+        | farewell
+        | query
+        ;
+
+greeting : HELLO { printf("Chatbot: Hello! How can I help you today?\n"); }
+         ;
+
+farewell : GOODBYE { printf("Chatbot: Goodbye! Have a great day!\n"); }
+         ;
+
+query : TIME {
+                setenv("TZ", "CST6", 1);
+                tzset();
+                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);
+        }
+;
+
+query : WEATHER {
+                printf("Chatbot: It seems like the weather in Zapopan, Jalisco is quite charming at the moment!\n");
+        }
+;
+
+query : HOWAREYOU {
+                printf("Chatbot: Feeling the heat, but still keeping it cool!\n");
+        }
+;
+
+query : WRYD {
+                printf("Chatbot: Answering your questions!\n");
+        }
+;
+
+query : SINGREQUEST {
+        printf("Chatbot:\n"
+                "Twinkle, twinkle little star\n"
+                "How I wonder what you are\n"
+                "Up above the world so high\n"
+                "Like a diamond in the sky\n\n"
+
+                "Twinkle, twinkle little star\n"
+                "How I wonder what you are\n\n"
+
+                "Twinkle, twinkle little star\n"
+                "How I wonder what you are\n"
+                "Up above the world so high\n"
+                "Like a diamond in the sky\n\n"
+
+                "Twinkle, twinkle little star\n"
+                "How I wonder what you are\n");
+        }
+;
+
+%%
+
+int main() {
+    printf("Chatbot: Hi! You can greet me, ask for the time, ask me for the weather, ask me what I'm doing, ask me how I'm doing, ask me to sing a song or $
+    while (yyparse() == 0) {
+        // Loop until end of input
+    }
+    return 0;
+}
+
+void yyerror(const char *s) {
+    fprintf(stderr, "Chatbot: I didn't understand that.\n");
+}