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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
/* $Rev$ $Date$ */
#ifndef tuscany_slist_hpp
#define tuscany_slist_hpp
/**
* Useful functions to work with lists of strings and character streams.
*/
#include <iostream>
#include <string>
#include "function.hpp"
#include "list.hpp"
namespace tuscany {
/**
* Tokenize a string into a list of strings.
*/
const list<std::string> tokenize(const std::string& sep, const std::string& str) {
struct nested {
static const list<std::string> tokenize(const std::string& sep, const std::string& str, const unsigned int start = 0) {
if (start >= str.length())
return list<std::string>();
const unsigned int i = str.find_first_of(sep, start);
if (i == std::string::npos)
return mklist(str.substr(start));
return cons(str.substr(start, i - start), tokenize(sep, str, i + 1));
}
};
return nested::tokenize(sep, str, 0);
}
/**
* Returns a lazy list view of an input stream.
*/
struct ilistRead{
std::istream &is;
ilistRead(std::istream& is) : is(is) {
}
const list<std::string> operator()() {
char buffer[1024];
is.read(buffer, 1024);
const int n = is.gcount();
if (n ==0)
return list<std::string>();
return cons(std::string(buffer, n), (*this)());
}
};
const list<std::string> streamList(std::istream& is) {
return ilistRead(is)();
}
/**
* Fragment the first element of a list of strings to fit the given max length.
*/
const list<std::string> fragment(list<std::string> l, unsigned int max) {
const std::string s = car(l);
if (s.length() <= max)
return l;
return cons(s.substr(0, max), cons(s.substr(max), cdr(l)));
}
/**
* Write a list of strings to an output stream.
*/
std::ostream& write(const list<std::string>& l, std::ostream& os) {
if(isNil(l))
return os;
os << car(l);
return write(cdr(l), os);
}
}
#endif /* tuscany_slist_hpp */
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