94 lines
2.2 KiB
C++
94 lines
2.2 KiB
C++
#include "abbrev.h"
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namespace ledger {
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string abbreviate(const string& str,
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unsigned int width,
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elision_style_t elision_style,
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const bool is_account,
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int abbrev_length)
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{
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const unsigned int len = str.length();
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if (len <= width)
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return str;
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assert(width < 4095);
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static char buf[4096];
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switch (elision_style) {
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case TRUNCATE_LEADING:
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// This method truncates at the beginning.
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std::strncpy(buf, str.c_str() + (len - width), width);
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buf[0] = '.';
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buf[1] = '.';
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break;
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case TRUNCATE_MIDDLE:
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// This method truncates in the middle.
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std::strncpy(buf, str.c_str(), width / 2);
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std::strncpy(buf + width / 2,
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str.c_str() + (len - (width / 2 + width % 2)),
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width / 2 + width % 2);
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buf[width / 2 - 1] = '.';
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buf[width / 2] = '.';
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break;
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case ABBREVIATE:
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if (is_account) {
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std::list<string> parts;
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string::size_type beg = 0;
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for (string::size_type pos = str.find(':');
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pos != string::npos;
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beg = pos + 1, pos = str.find(':', beg))
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parts.push_back(string(str, beg, pos - beg));
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parts.push_back(string(str, beg));
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string result;
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unsigned int newlen = len;
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for (std::list<string>::iterator i = parts.begin();
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i != parts.end();
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i++) {
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// Don't contract the last element
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std::list<string>::iterator x = i;
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if (++x == parts.end()) {
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result += *i;
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break;
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}
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if (newlen > width) {
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result += string(*i, 0, abbrev_length);
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result += ":";
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newlen -= (*i).length() - abbrev_length;
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} else {
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result += *i;
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result += ":";
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}
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}
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if (newlen > width) {
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// Even abbreviated its too big to show the last account, so
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// abbreviate all but the last and truncate at the beginning.
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std::strncpy(buf, result.c_str() + (result.length() - width), width);
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buf[0] = '.';
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buf[1] = '.';
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} else {
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std::strcpy(buf, result.c_str());
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}
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break;
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}
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// fall through...
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case TRUNCATE_TRAILING:
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// This method truncates at the end (the default).
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std::strncpy(buf, str.c_str(), width - 2);
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buf[width - 2] = '.';
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buf[width - 1] = '.';
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break;
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}
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buf[width] = '\0';
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return buf;
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}
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} // namespace ledger
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