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#include "FileWordGenerator.h"
using namespace Dasher;
CFileWordGenerator::CFileWordGenerator(CMessageDisplay *pMsgs, const CAlphInfo *pAlph, const CAlphabetMap *pAlphMap)
: CWordGeneratorBase(pAlph,pAlphMap), AbstractParser(pMsgs) {
}
bool CFileWordGenerator::Parse(const std::string &strDesc, istream &in, bool bUser) {
//non-file streams not supported (yet)
DASHER_ASSERT(false);
return false;
}
bool CFileWordGenerator::ParseFile(const std::string &sPath, bool bUser) {
if (bUser && !m_bAcceptUser) return false;
m_sFileHandle.close();
m_vLineIndices.clear();
m_sPath=sPath;
m_sFileHandle.open(m_sPath.c_str());
if(m_sFileHandle.fail()) {
m_sPath="";
return false;
}
/*The hard way:
m_vLineIndices.push_back(0);
streampos pos=0;
char buf[1024];
for (int read = m_sFileHandle.read(buf,1024).gcount();;) {
for (int i=0; i<read-1; i++) {
if (buf[i]=='\r') {
if (buf[i+1]=='\n') i++;
} else if (buf[i]!='\n') continue;
m_vLineIndices.push_back(pos+i);
}
if (read!=1024) break;
//haven't checked final byte; might be \r and need \n from next read
pos+=read-1;
buf[0]=buf[read-1];
read = m_sFileHandle.read(&buf[1],1023).gcount()+1;
}
*/
//The easy way - TODO will this work with Windows line endings?
for (std::string buf; m_sFileHandle.good();) {
streampos pos = m_sFileHandle.tellg();
std::getline(m_sFileHandle, buf);
if (!buf.empty()) m_vLineIndices.push_back(pos);
}
return true;
}
std::string CFileWordGenerator::GetLine() {
if (m_vLineIndices.empty()) return "";
if (m_sFileHandle.eof() && !m_sFileHandle.bad()) {
//no error has occurred, but we've reached the end of file. So reset state as we're about to seek...
m_sFileHandle.clear();
}
int i = rand() % m_vLineIndices.size();
m_sFileHandle.seekg(m_vLineIndices[i]);
m_vLineIndices.erase(m_vLineIndices.begin()+i);
//TODO: call DashIntf::Message, and return "", instead?
if (!m_sFileHandle.good()) throw std::runtime_error("File I/O error reading "+m_sPath);
string sRes;
std::getline(m_sFileHandle, sRes);
DASHER_ASSERT(!sRes.empty()); //shouldn't have stored index of empty string
return sRes;
}
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