How to encode text into html format

[Fred Yu]

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

[Sam]

Fred Yu writes:

Hi,

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

That's "&lt;".

replace "&" with "&amp".

That's "&amp;".

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]

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_iterator, std::ostream_iterator
Algorithms: std::transform
Best

Kai-Uwe Bux

[AnonMail2005]

On Jun 1, 12:37*pm, "Fred Yu" <[e-mail]:

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]

"Fred Yu" <je*********@sohu.comschrieb im Newsbeitrag
news:g1**********@news.cn99.com...

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(pos,1);
Input.Insert("%26lt",pos);
}
}
while(Input.Pos("<") NULL);

[James Kanze]

On Jun 1, 8:11 pm, Kai-Uwe Bux <[e-mail]:

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_iterator, std::ostream_iterator
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_iterator, and as string
transformer class that I've written, which works something like
$(patsubst...) in GNU make).

--
James Kanze (GABI Software) email:ja*********@gmail.com
Conseils en informatique orientée objet/
Beratung in objektorientierter Datenverarbeitung
9 place Sémard, 78210 St.-Cyr-l'École, France, [phone]

[Kai-Uwe Bux]

James Kanze wrote:

On Jun 1, 8:11 pm, Kai-Uwe Bux <[e-mail]:

>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_iterator, std::ostream_iterator
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_iterator, 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_iterator 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_iterator<std::string>( std::cout, "" ),
the_encoder );
}
Best

Kai-Uwe Bux

[Frank Birbacher]

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_iterator, 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.begin(), str.end(),
ostream_iterator<const char*>(cout),
&replace);

Frank

[James Kanze]

On Jun 1, 11:25 pm, Frank Birbacher <[e-mail]:

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_iterator, 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.begin(), str.end(),
ostream_iterator<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:ja*********@gmail.com
Conseils en informatique orientée objet/
Beratung in objektorientierter Datenverarbeitung
9 place Sémard, 78210 St.-Cyr-l'École, France, [phone]

[Frank Birbacher]

Hi!

James Kanze schrieb:

>char const* replace(char);

>transform(str.begin(), str.end(),
ostream_iterator<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?

Yes. I think I needed such a conversion once and used a switch. The
obvious problem is to efficiently handle a char that is not transformed
to more than one char (the common case). I think I actually used
for_each instead of transform:

void appendReplacement(ostream& stream, const char c)
{
switch(c)
{
case '<': stream << "&lt;"; break;
default: stream << c; break;
}
}

This makes it possible to append different types (char or char*) to the
stream and yet requires no [CHAR_MAX] array, but lets the compiler
choose the most efficient lookup (through the switch).

Of course can this function be implemented as a functor.

Frank

[Fred Yu]

"Fred Yu" <je*********@sohu.comдÈëÏûÏ¢ÐÂÎÅ:g1**********@new s.cn99.com...

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

Thanks for your help.