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strgen.h
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strgen.h
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/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is COID/comm module.
*
* The Initial Developer of the Original Code is
* Brano Kemen
* Portions created by the Initial Developer are Copyright (C) 2007
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef __COID_COMM_STRGEN__HEADER_FILE__
#define __COID_COMM_STRGEN__HEADER_FILE__
#include "namespace.h"
#include "token.h"
#include "local.h"
#include "str.h"
#include "dynarray.h"
COID_NAMESPACE_BEGIN
///Class used to generate string by substituting dynamically provided pattern values in source string
class string_maker
{
struct subst
{
charstr key; //< name of the substitution variable
token value; //< currently bound key value
charstr buf; //< owned value content for converted values
subst(){}
subst( const token& k )
{
key = k;
value.set_empty();
}
};
struct chunk
{
token prefix; //< static text to insert before
subst* var; //< variable to insert after
};
typedef local<subst> Lsubst;
dynarray<Lsubst> keys; //< sorted array of substitution tokens
dynarray<chunk> blks; //< substitution blocks
struct sort_subst
{
bool operator() ( const Lsubst& s, const token& k ) const { return s->key < k; }
};
sort_subst sorter;
protected:
subst* find_or_create( const token& k )
{
uints i = keys.lower_boundT( k, sorter );
if( i>=keys.size() || keys[i]->key!=k )
return (*keys.ins(i) = new subst(k));
return keys[i].ptr();
}
public:
string_maker( token str )
{
//look for '$[A..Za..z0..9_]+$'
uint off=0;
for(;;)
{
off = str.count_notchar('$',off);
if( str.nth_char(off)==0 ) break;
++off;
uint ofk = off;
for( ; off<str.len(); ++off )
{
char c = str[off];
if( !(c>='A' && c<='Z') && !(c>='a' && c<='z') && !(c>='0' && c<='9') && !(c=='_') ) break;
}
if( str[off] != '$' ) { ++off; continue; }
token k( str.ptr()+ofk, off-ofk );
chunk* ch = blks.add();
ch->prefix.set( str.ptr(), ofk-1 );
++off;
str.shift_start(off);
off = 0;
ch->var = find_or_create(k);
}
chunk* ch = blks.add();
ch->prefix.set( str.ptr(), off );
ch->var = 0;
//add empty token $$ to mean single $
subst* s = find_or_create( token::empty() );
s->value = "$";
}
bool bind( const token& key, const token& value )
{
uints i = keys.lower_boundT( key, sorter );
if( i>=keys.size() ) return false;
keys[i]->value = value;
return true;
}
bool bind( const token& key, int value )
{
uints i = keys.lower_boundT( key, sorter );
if( i>=keys.size() ) return false;
keys[i]->buf = value;
keys[i]->value = keys[i]->buf;
return true;
}
bool bind_swap( const token& key, charstr& value )
{
uints i = keys.lower_boundT( key, sorter );
if( i>=keys.size() ) return false;
keys[i]->buf.swap(value);
keys[i]->value = keys[i]->buf;
return true;
}
///Write substituted text to a binstream
void write( binstream& bin )
{
uints n = blks.size();
for( uints i=0; i<n; ++i )
{
bin.write_token( blks[i].prefix );
if( blks[i].var )
bin.write_token( blks[i].var->value );
}
}
};
COID_NAMESPACE_END
#endif //__COID_COMM_STRGEN__HEADER_FILE__