How to encode text into html format

**Sam** · Jun 1 '08, 05:55 PM

Re: How to encode text into html format

Fred Yu writes:

Hi,
>
I want to encode input text into html format such as replace "<" with "&lt",

That's "<".

replace "&" with "&amp".

That's "&".

Could you give me some ideas? Thanks.

Try to do your homework assignment by yourself. This is a simple
search/replace operation, and there are many ways to get it done.

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**Kai-Uwe Bux** · Jun 1 '08, 06:15 PM

Re: How to encode text into html format

Fred Yu wrote:

Hi,
>
I want to encode input text into html format such as replace "<" with
"&lt", replace "&" with "&amp".
Could you give me some ideas? Thanks.

Containers: std::map< char, std::string >
Iterators: std::istream_it erator, std::ostream_it erator
Algorithms: std::transform

Best

Kai-Uwe Bux

**AnonMail2005@gmail.com** · Jun 1 '08, 07:25 PM

Re: How to encode text into html format

On Jun 1, 12:37 pm, "Fred Yu" <jean_y_f...@so hu.comwrote:

Hi,
>
I want to encode input text into html format such as replace "<" with "&lt",
replace "&" with "&amp".
Could you give me some ideas? Thanks.
>
Fred

google iconv. It will convert from many char encodings to many other
char
encodings. I've used it to "format" text in various XML wrapper
classes.

**Elmar Baumann** · Jun 1 '08, 07:35 PM

Re: How to encode text into html format

"Fred Yu" <jean_y_f398@so hu.comschrieb im Newsbeitrag
news:g1uka7$o1g $2@news.cn99.co m...

Hi,
>
I want to encode input text into html format such as replace "<" with
"&lt",
replace "&" with "&amp".

Example for AnsiString Class

AnsiString Input; //contains the html code
int pos;

do // replace "<" to "&lt"
{
if(Input.Pos("< ") NULL)
{
pos = Input.Pos("<");
Input.Delete(po s,1);
Input.Insert("% 26lt",pos);
}
}
while(Input.Pos ("<") NULL);

**James Kanze** · Jun 1 '08, 08:55 PM

Re: How to encode text into html format

On Jun 1, 8:11 pm, Kai-Uwe Bux <jkherci...@gmx .netwrote:

Fred Yu wrote:

I want to encode input text into html format such as replace "<" with
"&lt", replace "&" with "&amp".
Could you give me some ideas? Thanks.

Containers: std::map< char, std::string >
Iterators: std::istream_it erator, std::ostream_it erator
Algorithms: std::transform

Agreed for the first (although it may be overkill---in this
particular case, I think I'd go with a simple switch).

No real need for the second; just use istream::get() and
ostream::put() (or operator<< in some cases).

As to the third: how? You're replacing a single character with
a sequence of characters, and transform does a one to one (which
in practice makes it of fairly limited utility---although I've
used it with a vector<string>, ostream_iterato r, and as string
transformer class that I've written, which works something like
$(patsubst...) in GNU make).

--
James Kanze (GABI Software) email:james.kan ze@gmail.com
Conseils en informatique orientée objet/
Beratung in objektorientier ter Datenverarbeitu ng
9 place Sémard, 78210 St.-Cyr-l'École, France, +33 (0)1 30 23 00 34

**Kai-Uwe Bux** · Jun 1 '08, 09:05 PM

Re: How to encode text into html format

James Kanze wrote:

On Jun 1, 8:11 pm, Kai-Uwe Bux <jkherci...@gmx .netwrote:

>Fred Yu wrote:

I want to encode input text into html format such as replace "<" with
"&lt", replace "&" with "&amp".
Could you give me some ideas? Thanks.

>

>Containers: std::map< char, std::string >
>Iterators: std::istream_it erator, std::ostream_it erator
>Algorithms: std::transform

>
Agreed for the first (although it may be overkill---in this
particular case, I think I'd go with a simple switch).
>
No real need for the second; just use istream::get() and
ostream::put() (or operator<< in some cases).
>
As to the third: how? You're replacing a single character with
a sequence of characters, and transform does a one to one (which
in practice makes it of fairly limited utility---although I've
used it with a vector<string>, ostream_iterato r, and as string
transformer class that I've written, which works something like
$(patsubst...) in GNU make).

I was thinking of something like this:

#include <iostream>
#include <iterator>
#include <map>
#include <algorithm>
#include <cassert>

struct encoder {

std::map< char, std::string the_map;

encoder ( void ) {
the_map[ 'a' ] = "a";
// ...
the_map[ '&' ] = "&amp";
// ...
}

std::string const & operator() ( char ch ) const {
std::map< char, std::string >::const_iterat or iter =
the_map.find( ch );
assert( iter != the_map.end() );
return ( iter->second );
}
};

int main ( void ) {
encoder the_encoder;
std::transform( std::istreambuf _iterator<char> ( std::cin ),
std::istreambuf _iterator<char> (),
std::ostream_it erator<std::str ing>( std::cout, "" ),
the_encoder );
}

Best

Kai-Uwe Bux

**Frank Birbacher** · Jun 1 '08, 09:35 PM

Re: How to encode text into html format

Hi!

James Kanze schrieb:

As to the third: how? You're replacing a single character with
a sequence of characters, and transform does a one to one (which
in practice makes it of fairly limited utility---although I've
used it with a vector<string>, ostream_iterato r, and as string
transformer class that I've written, which works something like
$(patsubst...) in GNU make).

The source range of transform may have another value type than the
destination range.

char const* replace(char);

transform(str.b egin(), str.end(),
ostream_iterato r<const char*>(cout),
&replace);

Frank

**James Kanze** · Jun 2 '08, 08:25 AM

Re: How to encode text into html format

On Jun 1, 11:01 pm, Kai-Uwe Bux <jkherci...@gmx .netwrote:

James Kanze wrote:

On Jun 1, 8:11 pm, Kai-Uwe Bux <jkherci...@gmx .netwrote:

Fred Yu wrote:
I want to encode input text into html format such as
replace "<" with "&lt", replace "&" with "&amp". Could
you give me some ideas? Thanks.

Containers: std::map< char, std::string >
Iterators: std::istream_it erator, std::ostream_it erator
Algorithms: std::transform

Agreed for the first (although it may be overkill---in this
particular case, I think I'd go with a simple switch).

No real need for the second; just use istream::get() and
ostream::put() (or operator<< in some cases).

As to the third: how? You're replacing a single character
with a sequence of characters, and transform does a one to
one (which in practice makes it of fairly limited
utility---although I've used it with a vector<string>,
ostream_iterato r, and as string transformer class that I've
written, which works something like $(patsubst...) in GNU
make).

I was thinking of something like this:

#include <iostream>
#include <iterator>
#include <map>
#include <algorithm>
#include <cassert>

struct encoder {

std::map< char, std::string the_map;

encoder ( void ) {
the_map[ 'a' ] = "a";
// ...
the_map[ '&' ] = "&amp";
// ...
}

std::string const & operator() ( char ch ) const {
std::map< char, std::string >::const_iterat or iter =
the_map.find( ch );
assert( iter != the_map.end() );
return ( iter->second );
}
};

int main ( void ) {
encoder the_encoder;
std::transform( std::istreambuf _iterator<char> ( std::cin ),
std::istreambuf _iterator<char> (),
std::ostream_it erator<std::str ing>( std::cout, "" ),
the_encoder );
}

Which looks like a lot of overhead (including in terms of
programming) for very little gain. It might be worth it if you
create some sort of generic encoder, in order to reuse the idiom
in many different contexts, but for such a simple problem, it
just seems overkill for a onetime solution. As I said, I'd
probably go with the switch. If I were going to go to the
effort of initializing the map completely, I'd probably go with
a char const*[UCHAR_MAX], rather than std::map. Or a map with
just the elements which don't use an identity transformation.
And I'd probably still write out the loop; somehow, the idea of
transforming each individual character into a string just to
output it bothers me.

--
James Kanze (GABI Software) email:james.kan ze@gmail.com
Conseils en informatique orientée objet/
Beratung in objektorientier ter Datenverarbeitu ng
9 place Sémard, 78210 St.-Cyr-l'École, France, +33 (0)1 30 23 00 34

**James Kanze** · Jun 2 '08, 08:25 AM

Re: How to encode text into html format

On Jun 1, 11:25 pm, Frank Birbacher <bloodymir.c... @gmx.netwrote:

James Kanze schrieb:

As to the third: how? You're replacing a single character with
a sequence of characters, and transform does a one to one (which
in practice makes it of fairly limited utility---although I've
used it with a vector<string>, ostream_iterato r, and as string
transformer class that I've written, which works something like
$(patsubst...) in GNU make).

The source range of transform may have another value type than the
destination range.

I'm aware of that, however...

char const* replace(char);

transform(str.b egin(), str.end(),
ostream_iterato r<const char*>(cout),
&replace);

For some reason, I was thinking in terms of std::string, and not
char const*. And converting each std::string seemed a bit heavy
for the task at hand. But a statically generated char const*[];
why not?

--
James Kanze (GABI Software) email:james.kan ze@gmail.com
Conseils en informatique orientée objet/
Beratung in objektorientier ter Datenverarbeitu ng
9 place Sémard, 78210 St.-Cyr-l'École, France, +33 (0)1 30 23 00 34

How to encode text into html format

How to encode text into html format

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