user_interface.c

#include "document.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <limits.h>

#define MAX_LINE 1024

int run_if_Valid(char* cmd_name, char* arg1, char* arg2, char* arg3, char* arg4, char* line, int num_cmd_parts, Document* doc);
char* get_str_after_star(char* str);


int main(int argc, char* argv[]) {
    int arg_num = 2, num_cmd_parts = 0, is_std_io = 1;
    char line[MAX_LINE+10+1] = "", cmd_name[MAX_LINE+1] = "", arg1[MAX_LINE+1] = "",
        arg2[MAX_LINE+1] = "", arg3[MAX_LINE+1] = "", arg4[MAX_LINE+1] = "";
    FILE* input;
    Document doc;
    init_document(&doc, "main_document");

    /*add_paragraph_after(&doc, 0);
    append_line(&doc, 1, "1");
    append_line(&doc, 1, "2");
    add_paragraph_after(&doc, 0);
    add_paragraph_after(&doc, 0);
    append_line(&doc, 1, "3");
    append_line(&doc, 1, "4");
    append_line(&doc, 2, "5");
    append_line(&doc, 2, "6");*/

    if (argc > 2) {
        fprintf(stderr, "Usage: user_interface\nUsage: user_interface <filename>\n");
        return EX_USAGE;
    } else if(argc == 2) {
        if((input = fopen(argv[1], "r")) != NULL) {
            is_std_io = 0;
        } else {
            fprintf(stderr, "%s cannot be opened.\n", argv[1]);
            return EX_OSERR;
        }
    } else {
        input = stdin;
    }

    while (fgets(line, MAX_LINE + 10, input)) {
        if(is_std_io) printf("> ");
        if ( (num_cmd_parts = sscanf(line, " %s %s %s %s %s ", cmd_name, arg1, arg2, arg3, arg4)) == -1) {
            continue;
        }


        if(run_if_Valid(cmd_name, arg1, arg2, arg3, arg4, line, num_cmd_parts, &doc) == -1) {
            break;
        }

        strcpy(cmd_name, "");
        strcpy(arg1, "");
        strcpy(arg2, "");
        strcpy(arg3, "");
        strcpy(arg4, "");
    }

    fclose(input);
}


int run_if_Valid(char* cmd_name, char* arg1, char* arg2, char* arg3, char* arg4, char* line, int num_cmd_parts, Document* doc) {
    char* str_after_star, str_in_quote[MAX_STR_SIZE], *quote1_ptr = NULL, *quote2_ptr = NULL;
    int start = 0, end = 0;
/*  printf("cmd_name: %s arg1: %s arg2: %s arg3: %s arg4: %s num_cmd_parts: %d\n", cmd_name, arg1, arg2, arg3, arg4, num_cmd_parts);*/
    if(is_comment(cmd_name)) return SUCCESS;
    if(strlen(line) > MAX_LINE) {
        printf("Invalid Command\n");
        return SUCCESS;
    }

    if(strchr(line, '*') && num_cmd_parts >= 3) {
        str_after_star = get_str_after_star(line);

        if(!strcmp(cmd_name, "append_line")) {
            /*printf("APPENDED LINE %d String: %s\n", atoi(arg1), str_after_star);*/
            if ( (atoi(arg1) > 0 || !strcmp(arg1, "0")) ) {
                run(append_line(doc, atoi(arg1),  str_after_star), "append_line");
            } else {
                printf("Invalid Command\n");
            }
        } else if(!strcmp(cmd_name, "add_line_after")) {
            /*printf("ADDED LINE %d %d String: %s\n", atoi(arg1), atoi(arg2), str_after_star);*/
            if( (atoi(arg1) > 0 || !strcmp(arg1, "0")) && (atoi(arg2) > 0 || !strcmp(arg2, "0")) ) {
                run(add_line_after(doc, atoi(arg1), atoi(arg2), str_after_star), "add_line_after");
            } else {
                printf("Invalid Command\n");
            }
        } else {
            printf("Invalid Command\n");
        }
    } else if (strstr(line, "\"") && num_cmd_parts > 1) {
        if (!strcmp(cmd_name, "highlight_text")) {
            quote1_ptr = strchr(line, '\"') + 1;
            quote1_ptr = strchr(quote1_ptr, '\"');
            *quote1_ptr = '\0';
            quote1_ptr = strchr(line, '\"') + 1;

            highlight_text(doc, quote1_ptr);
        } else if (!strcmp(cmd_name, "remove_text")) {
            quote1_ptr = strchr(line, '\"') + 1;
            quote1_ptr = strchr(quote1_ptr, '\"');
            *quote1_ptr = '\0';
            quote1_ptr = strchr(line, '\"') + 1;

            remove_text(doc, quote1_ptr);
        } else if (!strcmp(cmd_name, "replace_text")) {
            quote1_ptr = strchr(line, '\"') + 1;
            quote1_ptr = strchr(quote1_ptr, '\"');
            *quote1_ptr = '\0';
            quote2_ptr = quote1_ptr + 1;
            quote1_ptr = strchr(line, '\"') + 1;

            quote2_ptr = strchr(quote2_ptr, '\"') + 1;
            quote2_ptr = strchr(quote2_ptr, '\"');
            *quote2_ptr = '\0';
            quote2_ptr = strchr(quote1_ptr + strlen(quote1_ptr) + 1, '\"') + 1;

            if (quote1_ptr && quote2_ptr && *quote1_ptr && *quote2_ptr) {
                run(replace_text(doc, quote1_ptr, quote2_ptr), "replace_text");
            } else {
                printf("Invalid Command\n");
            }
        } else {
            printf("Invalid Command\n");
        }
    } else if (num_cmd_parts == 0) {
        return SUCCESS;
    } else if (num_cmd_parts == 1) {
        /*print quit exit resetdocument*/
        /*printf("case 1\n");*/
        if(!strcmp(cmd_name, "print_document")) {
            /*printf("PRINTED DOC\n");*/
            print_document(doc);
        } else if(!strcmp(cmd_name, "reset_document")) {
            reset_document(doc);
        } else if(!strcmp(cmd_name, "quit") || !strcmp(cmd_name, "exit")) {
            exit(EXIT_SUCCESS);
            return -1;
        } else {
            printf("Invalid Command\n");
        }
    } else if (num_cmd_parts == 2) {
        /*add_pafter load file highlight save*/
        /*printf("case 2\n");*/
        if(!strcmp(cmd_name, "add_paragraph_after")) {
            /*printf("ADDED P AFTER %d\n", atoi(arg1));*/
            if(atoi(arg1) > 0 || !strcmp(arg1, "0")) {
                run(add_paragraph_after(doc, atoi(arg1)), "add_paragraph_after");
            } else {
                printf("Invalid Command\n");
            }
        } else if (!strcmp(cmd_name, "load_file")) {
            run(load_file(doc, arg1), "load_file");
        } else if (!strcmp(cmd_name, "save_document")) {
            run(save_document(doc, arg1), "save_document");
        } else {
            printf("Invalid Command\n");
        }
    } else if (num_cmd_parts == 3) {
        /*remove */
        if(!strcmp(cmd_name, "remove_line")) {
            /*printf("ADDED P AFTER %d\n", atoi(arg1));*/
            if ( (atoi(arg1) > 0 || !strcmp(arg1, "0")) && (atoi(arg2) > 0 || !strcmp(arg2, "0")) ) {
                run(remove_line(doc, atoi(arg1), atoi(arg2)), "remove_line");
            } else {
                printf("Invalid Command\n");
            }
        } else {
            printf("Invalid Command\n");
        }
    } else {
        printf("Invalid Command\n");
        return 0;
    }
}

char* get_str_after_star(char* str) {
    str = strstr(str, "*") + 1;
    str[strcspn(str, "\n")] = 0;

    return str;
}

int run(int exit_condition, char* str) {
    if(exit_condition == FAILURE) {
        printf("%s failed\n", str);
    }

    return 0;
}

/*returns true if there are arugments after the nth command line argument (inclusive)*/
int are_args_after(int n) {
/*  for */
}

int is_comment(char * str) {
    char* result = strchr(str, '#');
    int index = 0;
    if(result == NULL) return 0;

    for(index; index < str - result; index++) {
        if(!isspace(str + index)) return 0;
    }

    return 1;
}