Decorator_Exercise.c

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#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
#include "helpers/dynamicstring.h"
#include "helpers/formatstring.h"
 
#include "Decorator_Exercise.h"
 
 
//=============================================================================
//=============================================================================
 
DynamicString* _Decorate(DynamicString* s, const char* decoration)
{
    if (s != NULL && decoration != NULL)
    {
        char *line = formatstring(decoration, s->string);
        if (line != NULL)
        {
            DynamicString_Set(s, line);
            free(line);
        }
    }
    return s;
}
 
 
DynamicString* RedForegroundDecorator(DynamicString* s)
{
    return _Decorate(s, "\x1b[31m%s\x1b[39m");
}
 
DynamicString* WhiteBackgroundDecorator(DynamicString* s)
{
    return _Decorate(s, "\x1b[47m%s\x1b[49m");
}
 
DynamicString* UnderlineDecorator(DynamicString* s)
{
    return _Decorate(s, "\x1b[4m%s\x1b[24m");
}
 
 
//=============================================================================
//=============================================================================
 
// ! [Using Decorator in C]
void Decorator_Exercise(void)
{
    printf("\nDecorator_Exercise\n");
 
    const char* text = "This is raw text";
 
    DynamicString string;
    DynamicString_Initialize(&string);
    DynamicString_Set(&string, text);
 
    // Wrap the base element in three decorators.
    DynamicString* rendering = NULL;
    rendering = WhiteBackgroundDecorator(UnderlineDecorator(RedForegroundDecorator(&string)));
 
    printf("  Base Text element: \"%s\"\n", text);
    printf("  Decorated element: \"%s\"\n", rendering->string);
    DynamicString_Clear(&string);
 
    printf("  Done.\n");
}
// ! [Using Decorator in C]