A01639664-homework-07

labs/07/Makefile

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+# Define the compiler and flags
+CC = gcc
+LEX = flex
+YACC = bison
+YFLAGS = -d
+CFLAGS = -ll -ly -lcurl
+
+# Define the source files and output executable
+LEX_SRC = chatbot.l
+YACC_SRC = chatbot.y
+LEX_OUT = chatbot.c
+YACC_OUT = chatbot.tab.c
+YACC_HEADER = chatbot.tab.h
+EXEC = chatbot
+
+# Define the test input and output files
+TEST_INPUT = in.txt
+EXPECTED_OUTPUT = out.txt
+ACTUAL_OUTPUT = actual_output.txt
+
+# Default target
+all: $(EXEC)
+
+# Compile the executable
+$(EXEC): $(LEX_OUT) $(YACC_OUT)
+	$(CC) $(LEX_OUT) $(YACC_OUT) -o $(EXEC) $(CFLAGS)
+
+# Generate the lex and yacc output files
+$(LEX_OUT): $(LEX_SRC)
+	$(LEX) $(LEX_SRC)
+
+$(YACC_OUT): $(YACC_SRC)
+	$(YACC) $(YFLAGS) $(YACC_SRC)
+
+# Run the tests
+test: $(EXEC)
+	./$(EXEC) < $(TEST_INPUT) > $(ACTUAL_OUTPUT)
+	diff -u $(EXPECTED_OUTPUT) $(ACTUAL_OUTPUT) || true
+
+# Clean up the generated files
+clean:
+	rm -f $(LEX_OUT) $(YACC_OUT) $(YACC_HEADER) $(EXEC) $(ACTUAL_OUTPUT)
+
+# Phony targets
+.PHONY: all clean test

labs/07/chatbot.l

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+%{
+#include "chatbot.tab.h"
+%}
+%option outfile="chatbot.c"
+%%
+
+hello|hi|hey                  { return HELLO; }
+goodbye|bye                   { return GOODBYE; }
+time                          { return TIME; }
+what[[:space:]]is[[:space:]]the[[:space:]]time { return TIME; }
+what[[:space:]]time[[:space:]]is[[:space:]]it  { return TIME; }
+what[[:space:]]is[[:space:]]your[[:space:]]name { return NAME; }
+what[[:space:]]is[[:space:]]the[[:space:]]weather { return WEATHER; }
+weather[[:space:]]in[[:space:]]([a-zA-Z ]+)        { yylval.str = strdup(yytext + 11); return WEATHER_CITY; }
+[0-9]+[[:space:]]*\+[[:space:]]*[0-9]+   { yylval.str = strdup(yytext); return ADD; }
+[0-9]+[[:space:]]*-[[:space:]]*[0-9]+   { yylval.str = strdup(yytext); return SUB; }
+[0-9]+[[:space:]]*\*[[:space:]]*[0-9]+   { yylval.str = strdup(yytext); return MUL; }
+[0-9]+[[:space:]]*\/[[:space:]]*[0-9]+   { yylval.str = strdup(yytext); return DIV; }
+
+\n                            { return 0; }
+.                             { return yytext[0]; }
+
+%%
+
+int yywrap() {
+    return 1;
+}

labs/07/chatbot.y

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+%{
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <curl/curl.h>
+
+void yyerror(const char *s);
+int yylex(void);
+
+size_t WriteCallback(void *contents, size_t size, size_t nmemb, void *userp) {
+    size_t total_size = size * nmemb;
+    strncat(userp, contents, total_size);
+    return total_size;
+}
+
+void get_weather(char *buffer, size_t buffer_size, const char *city) {
+    CURL *curl;
+    CURLcode res;
+    char url[256];
+    char *encoded_city;
+
+    curl_global_init(CURL_GLOBAL_DEFAULT);
+    curl = curl_easy_init();
+    if (curl) {
+        if (city) {
+            encoded_city = curl_easy_escape(curl, city, 0);
+            snprintf(url, sizeof(url), "https://wttr.in/%s?format=3", encoded_city);
+            curl_free(encoded_city);
+        } else {
+            snprintf(url, sizeof(url), "https://wttr.in/?format=3");
+        }
+
+        curl_easy_setopt(curl, CURLOPT_URL, url);
+        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteCallback);
+        curl_easy_setopt(curl, CURLOPT_WRITEDATA, buffer);
+
+        res = curl_easy_perform(curl);
+        if (res != CURLE_OK) {
+            fprintf(stderr, "curl_easy_perform() failed: %s\n", curl_easy_strerror(res));
+        }
+
+        curl_easy_cleanup(curl);
+    }
+    curl_global_cleanup();
+}
+
+void print_weather(const char *city) {
+    char buffer[10000] = {0};
+    get_weather(buffer, sizeof(buffer), city);
+
+    if (strlen(buffer) > 0) {
+        printf("Chatbot: %s", buffer);
+    } else {
+        printf("Chatbot: Sorry, I couldn't fetch the weather information.\n");
+    }
+}
+
+void perform_calculation(char *expr) {
+    char op;
+    int num1, num2, result;
+    sscanf(expr, "%d %c %d", &num1, &op, &num2);
+
+    switch (op) {
+        case '+':
+            result = num1 + num2;
+            break;
+        case '-':
+            result = num1 - num2;
+            break;
+        case '*':
+            result = num1 * num2;
+            break;
+        case '/':
+            if (num2 != 0)
+                result = num1 / num2;
+            else {
+                printf("Chatbot: Cannot divide by zero.\n");
+                return;
+            }
+            break;
+        default:
+            printf("Chatbot: Invalid operation.\n");
+            return;
+    }
+    printf("Chatbot: The result of %d %c %d is %d.\n", num1, op, num2, result);
+}
+
+
+%}
+
+%union {
+    char *str;
+}
+
+%token HELLO GOODBYE TIME NAME WEATHER WEATHER_CITY ADD SUB MUL DIV
+%type <str> WEATHER_CITY ADD SUB MUL DIV
+
+
+%%
+
+chatbot : greeting
+        | farewell
+        | query
+        | name_query
+        | weather_query
+        | weather_city_query
+        | calculation
+        ;
+
+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_query : NAME { printf("Chatbot: My name is Chatbot. My creator wasn't very original!\n"); }
+           ;
+
+weather_query : WEATHER { 
+                   print_weather(NULL);
+                 }
+              ;
+
+weather_city_query :  WEATHER_CITY { 
+                        print_weather($1); free($1);
+                      }
+                   ;
+
+calculation : ADD { perform_calculation($1); free($1); }
+           | SUB { perform_calculation($1); free($1); }
+           | MUL { perform_calculation($1); free($1); }
+           | DIV { perform_calculation($1); free($1); }
+           ;
+
+%%
+
+int main() {
+    printf("Chatbot: Hi! You can greet me, ask for the time, inquire about the weather, I can help you with simple math expressions, 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");
+}

labs/07/in.txt

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+hello
+what is your name
+what time is it
+what is the weather
+weather in Berlin
+2+2
+3 * 4
+12 / 3
+22 - 7
+goodbye

labs/07/out.txt

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+Chatbot: Hi! You can greet me, ask for the time, inquire about the weather, I can help you with simple math expressions, or say goodbye.
+Chatbot: Hello! How can I help you today?
+Chatbot: My name is Chatbot. My creator wasn't very original!
+Chatbot: The current time is 19:29.
+Chatbot: Guadalajara, Mexico: ☀️   +36°C
+Chatbot: Berlin: ☀️   +18°C
+Chatbot: The result of 2 + 2 is 4.
+Chatbot: The result of 3 * 4 is 12.
+Chatbot: The result of 12 / 3 is 4.
+Chatbot: The result of 22 - 7 is 15.
+Chatbot: Goodbye! Have a great day!