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#include <cerrno>
#include <cstdio>
#include <cstddef>
#include <unistd.h>
#include <vector>
#include <string>
// this configuration puts 3-6 spaces between entries (excluding headers)
// and rounds the start of each field up to 4, for easier manual indenting
const size_t min_pad = 3;
const size_t align_pad = 4;
void add_pieces(std::vector<std::string>& line, std::vector<size_t>& sizes)
{
// This would get rid of trailing commas,
// but that would break certain db.txt files.
// Instead we'll have to manually check whether it's empty when checking length
// if (!line.empty() && line.back().empty())
// line.pop_back();
size_t num_sizes = line.size();
if (!num_sizes) // line.empty()
return;
if (line[0].size() >= 2
&& (line[0][0] == '#'
|| (line[0][0] == '/'
&& line[0][1] == '/')))
return;
if (num_sizes > sizes.size())
sizes.resize(num_sizes, 1UL);
for (size_t i = 0; i < num_sizes; ++i)
{
size_t elt_size = line[i].size();
if (!elt_size)// line[i].empty()
continue;
if (line[i][elt_size - 1] == ' ')
line[i].resize(--elt_size);
// mandatory padding and comma
elt_size += min_pad + 1;
if (elt_size > sizes[i])
// always true if we expanded sizes
sizes[i] = elt_size;
}
}
// the arguments may be the same file - the whole file is stored in memory
void aligncsv(FILE *in, FILE *out, const char *name)
{
bool newline = true;
bool can_split = true;
bool can_have_whitespace = false;
int c;
std::vector<std::vector<std::string> > contents;
while ((c = fgetc(in)) != -1)
{
if (c == '}' || c == '\n')
can_split = true;
if (c == '\n')
{
if (newline)
{
// preserve consecutive blank lines
contents.push_back(std::vector<std::string>());
}
newline = true;
continue;
}
if (c == '{')
can_split = false;
if (c == '\t')
c = ' ';
if (c == ' ')
{
if (!can_have_whitespace)
continue;
can_have_whitespace = false;
}
else
can_have_whitespace = true;
if (newline)
{
contents.push_back(std::vector<std::string>(1, std::string(1, c)));
newline = false;
}
else
{
if (can_split && c == ',')
{
can_have_whitespace = false;
contents.back().push_back(std::string());
}
else
contents.back().back() += c;
}
}
typedef std::vector<std::vector<std::string> >::iterator outer_it;
typedef std::vector<std::vector<std::string> >::const_iterator outer_cit;
typedef std::vector<size_t>::iterator pieces_it;
// at this point, each entry in a line:
// * does not start with whitespace
// * has one space in place of any previous run of whitespace
// * may end in a single space
// The last is fixed during add_pieces
std::vector<size_t> pieces;
for (outer_it it = contents.begin(), end = contents.end(); it != end; ++it)
add_pieces(*it, pieces);
for (pieces_it it = pieces.begin(), end = pieces.end(); it != end; ++it)
if (size_t trail = *it % align_pad)
*it += align_pad - trail;
if (in == out)
{
//rewind(out);
if (fseek(out, 0, SEEK_SET) == -1)
{
perror(name);
return;
}
if (ftruncate(fileno(out), 0) == -1)
{
perror(name);
return;
}
}
for (outer_cit oit = contents.begin(), oend = contents.end(); oit != oend; ++oit)
{
const std::vector<std::string>& inner = *oit;
size_t num_elems = inner.size();
// we have previously guaranteed that pieces[i].size() >= num_elems
for (size_t i = 0; i < num_elems; ++i)
{
// FIXME handle UTF-8 characters (here AND above?)
if (fputs(inner[i].c_str(), out) == -1)
{
perror(name);
return;
}
if (i != num_elems - 1)
{
if (fputc(',', out) == -1)
{
perror(name);
return;
}
size_t elem_length = inner[i].size() + 1;
while (elem_length++ < pieces[i])
{
if (fputc(' ', out) == -1)
{
perror(name);
return;
}
}
}
}
fputc('\n', out);
}
}
int main(int argc, char **argv)
{
if (argc == 1)
aligncsv(stdin, stdout, "<stdio>");
for (int i = 1; i < argc; ++i)
{
FILE *f = fopen(argv[i], "r+");
if (!f)
{
perror(argv[i]);
continue;
}
aligncsv(f, f, argv[i]);
fclose(f);
}
}
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