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// Copyright 2012 Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of Google Inc. nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "utils/text/operations.ipp"
#include <sstream>
#include "utils/format/macros.hpp"
#include "utils/sanity.hpp"
namespace text = utils::text;
/// Surrounds a string with quotes, escaping the quote itself if needed.
///
/// \param text The string to quote.
/// \param quote The quote character to use.
///
/// \return The quoted string.
std::string
text::quote(const std::string& text, const char quote)
{
std::ostringstream quoted;
quoted << quote;
std::string::size_type start_pos = 0;
std::string::size_type last_pos = text.find(quote);
while (last_pos != std::string::npos) {
quoted << text.substr(start_pos, last_pos - start_pos) << '\\';
start_pos = last_pos;
last_pos = text.find(quote, start_pos + 1);
}
quoted << text.substr(start_pos);
quoted << quote;
return quoted.str();
}
/// Fills a paragraph to the specified length.
///
/// This preserves any sequence of spaces in the input and any possible
/// newlines. Sequences of spaces may be split in half (and thus one space is
/// lost), but the rest of the spaces will be preserved as either trailing or
/// leading spaces.
///
/// \param input The string to refill.
/// \param target_width The width to refill the paragraph to.
///
/// \return The refilled paragraph as a sequence of independent lines.
std::vector< std::string >
text::refill(const std::string& input, const std::size_t target_width)
{
std::vector< std::string > output;
std::string::size_type start = 0;
while (start < input.length()) {
std::string::size_type width;
if (start + target_width >= input.length())
width = input.length() - start;
else {
if (input[start + target_width] == ' ') {
width = target_width;
} else {
const std::string::size_type pos = input.find_last_of(
" ", start + target_width - 1);
if (pos == std::string::npos || pos < start + 1) {
width = input.find_first_of(" ", start + target_width);
if (width == std::string::npos)
width = input.length() - start;
else
width -= start;
} else {
width = pos - start;
}
}
}
INV(width != std::string::npos);
INV(start + width <= input.length());
INV(input[start + width] == ' ' || input[start + width] == '\0');
output.push_back(input.substr(start, width));
start += width + 1;
}
if (input.empty()) {
INV(output.empty());
output.push_back("");
}
return output;
}
/// Fills a paragraph to the specified length.
///
/// See the documentation for refill() for additional details.
///
/// \param input The string to refill.
/// \param target_width The width to refill the paragraph to.
///
/// \return The refilled paragraph as a string with embedded newlines.
std::string
text::refill_as_string(const std::string& input, const std::size_t target_width)
{
return join(refill(input, target_width), "\n");
}
/// Splits a string into different components.
///
/// \param str The string to split.
/// \param delimiter The separator to use to split the words.
///
/// \return The different words in the input string as split by the provided
/// delimiter.
std::vector< std::string >
text::split(const std::string& str, const char delimiter)
{
std::vector< std::string > words;
if (!str.empty()) {
std::string::size_type pos = str.find(delimiter);
words.push_back(str.substr(0, pos));
while (pos != std::string::npos) {
++pos;
const std::string::size_type next = str.find(delimiter, pos);
words.push_back(str.substr(pos, next - pos));
pos = next;
}
}
return words;
}
/// Converts a string to a boolean.
///
/// \param str The string to convert.
///
/// \return The converted string, if the input string was valid.
///
/// \throw std::value_error If the input string does not represent a valid
/// boolean value.
template<>
bool
text::to_type(const std::string& str)
{
if (str == "true")
return true;
else if (str == "false")
return false;
else
throw value_error(F("Invalid boolean value '%s'") % str);
}
/// Identity function for to_type, for genericity purposes.
///
/// \param str The string to convert.
///
/// \return The input string.
template<>
std::string
text::to_type(const std::string& str)
{
return str;
}
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