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#ifndef __RANDOMFILE_HH__
#define __RANDOMFILE_HH__
// Copyright (C) 2002 Graydon Hoare <graydon@pobox.com>
//
// This program is made available under the GNU GPL version 2.0 or
// greater. See the accompanying file COPYING for details.
//
// This program is distributed WITHOUT ANY WARRANTY; without even the
// implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
// PURPOSE.
#include "vector.hh"
#include "lexical_cast.hh"
#include "randomizer.hh"
struct file_randomizer
{
randomizer & rng;
std::vector<std::string> lines;
std::string prefix;
file_randomizer(randomizer & rng)
: rng(rng)
{}
size_t random_index(bool last_line_ok = true)
{
if (last_line_ok)
return static_cast<size_t>(rng.uniform(lines.size()));
else
{
if (lines.size() == 0)
return 0;
else
return static_cast<size_t>(rng.uniform(lines.size() - 1));
}
}
void set_prefix(std::string const & p)
{
prefix = p;
}
void append_to(std::vector<std::string> & other)
{
for (std::vector<std::string>::const_iterator i = lines.begin();
i != lines.end(); ++i)
other.push_back(prefix + *i);
}
void initial_sequential_lines(int num_lines = 100) {
lines.clear();
for (int i = 0; i < num_lines; ++i)
{
lines.push_back(std::string("initial ") + boost::lexical_cast<std::string>(i));
}
}
void append_sequential_lines(int num_lines = 10) {
lines.clear();
for (int i = 0; i < num_lines; ++i)
{
lines.push_back(std::string("append ") + boost::lexical_cast<std::string>(i));
}
}
void prepend_sequential_lines(int num_lines = 10) {
lines.clear();
for (int i = 0; i < num_lines; ++i)
{
lines.push_back(std::string("prepend ") + boost::lexical_cast<std::string>(i));
}
}
void delete_percent_of_lines_randomly(int percent = 50) {
double scale = static_cast<double>(percent) / 100.0;
double nlines_d = static_cast<double>(lines.size()) * scale;
int nlines = static_cast<int>(nlines_d);
for (int i = 0; i < nlines; ++i)
lines.erase(lines.begin() + random_index(false));
}
void insert_sequential_percent_of_lines_randomly(int percent = 50) {
double scale = static_cast<double>(percent) / 100.0;
double nlines_d = static_cast<double>(lines.size()) * scale;
int nlines = static_cast<int>(nlines_d);
for (int i = 0; i < nlines; ++i)
{
lines.insert(lines.begin() + random_index(),
std::string("insert ") + boost::lexical_cast<std::string>(i));
}
}
static void build_random_fork(std::vector<std::string> & ancestor,
std::vector<std::string> & left,
std::vector<std::string> & right,
std::vector<std::string> & merged,
int n_hunks,
randomizer & rng)
{
bool last_was_insert = false;
bool last_insert_was_left = false;
file_randomizer fr(rng);
// maybe prepend something to one side or the other
if (rng.flip())
{
last_was_insert = true;
fr.prepend_sequential_lines();
last_insert_was_left = rng.flip();
if (last_insert_was_left)
fr.append_to(left);
else
fr.append_to(right);
fr.append_to(merged);
}
fr.lines.clear();
for (int h = 0; h < n_hunks; ++h)
{
file_randomizer hr(rng);
hr.set_prefix(std::string("hunk ") + boost::lexical_cast<std::string>(h) + " -- ");
hr.initial_sequential_lines(10);
if (rng.flip())
{
bool this_insert_is_left = rng.flip();
if (last_was_insert && (this_insert_is_left != last_insert_was_left))
{
fr.set_prefix("spacer ");
fr.initial_sequential_lines(3);
fr.append_to(left);
fr.append_to(right);
fr.append_to(ancestor);
fr.append_to(merged);
fr.set_prefix("");
}
last_insert_was_left = this_insert_is_left;
// doing an insert
hr.append_to(ancestor);
if (this_insert_is_left)
{
// inserting in left
hr.append_to(right);
hr.insert_sequential_percent_of_lines_randomly();
hr.append_to(left);
}
else
{
// inserting in right
hr.append_to(left);
hr.insert_sequential_percent_of_lines_randomly();
hr.append_to(right);
}
hr.append_to(merged);
last_was_insert = true;
}
else
{
// doing a delete
hr.append_to(ancestor);
if (rng.flip())
{
// deleting in left
hr.append_to(right);
hr.delete_percent_of_lines_randomly();
hr.append_to(left);
}
else
{
// deleting in right
hr.append_to(left);
hr.delete_percent_of_lines_randomly();
hr.append_to(right);
}
hr.append_to(merged);
last_was_insert = false;
}
}
// maybe append something to one side or the other
if (rng.flip())
{
bool this_insert_is_left = rng.flip();
if (last_was_insert && (this_insert_is_left != last_insert_was_left))
{
fr.set_prefix("spacer ");
fr.initial_sequential_lines(3);
fr.append_to(left);
fr.append_to(right);
fr.append_to(ancestor);
fr.append_to(merged);
fr.set_prefix("");
}
fr.append_sequential_lines();
if (this_insert_is_left)
fr.append_to(left);
else
fr.append_to(right);
fr.append_to(merged);
}
}
};
// Local Variables:
// mode: C++
// fill-column: 76
// c-file-style: "gnu"
// indent-tabs-mode: nil
// End:
// vim: et:sw=2:sts=2:ts=2:cino=>2s,{s,\:s,+s,t0,g0,^-2,e-2,n-2,p2s,(0,=s:
#endif // __RANDOMFILE_HH__
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