/* This file is part of
 * ====================================================== 
 * 
 *           LyX, The Document Processor
 *
 *           Copyright 1996-2000 The LyX Team.
 *
 *   Generalized simple lexical analizer.
 *   It can be used for simple syntax parsers, like lyxrc,
 *   texclass and others to come.   [asierra30/03/96]
 *
 * ====================================================== */

#include <config.h>

#ifdef __GNUG__
#pragma implementation "lyxlex.h"
#endif

#include "lyxlex.h"
#include "lyxlex_pimpl.h"
#include "support/filetools.h"

using std::ostream;
using std::istream;
using std::endl;


LyXLex::LyXLex(keyword_item * tab, int num)
	: pimpl_(new Pimpl(tab, num))
{}


LyXLex::~LyXLex() 
{
	delete pimpl_;
}


bool LyXLex::IsOK() const
{
	return pimpl_->is.good();
}


void LyXLex::setLineNo(int l)
{
	pimpl_->lineno = l;
}


int LyXLex::GetLineNo() const
{
	return pimpl_->lineno;
}

char const * LyXLex::text() const
{
	return &pimpl_->buff[0];
}


std::istream & LyXLex::getStream()
{
	return pimpl_->is;
}


void LyXLex::pushTable(keyword_item * tab, int num)
{
	pimpl_->pushTable(tab, num);
}


void LyXLex::popTable()
{
	pimpl_->popTable();
}


void LyXLex::printTable(ostream & os)
{
	pimpl_->printTable(os);
}


void LyXLex::printError(string const & message) const
{
	pimpl_->printError(message);
}


bool LyXLex::setFile(string const & filename)
{
	return pimpl_->setFile(filename);
}


void LyXLex::setStream(istream & i)
{
	pimpl_->setStream(i);
}


int LyXLex::lex()
{
	return pimpl_->lex();
}


int LyXLex::GetInteger() const
{
	if (pimpl_->buff[0] > ' ')   
		return atoi(pimpl_->buff);
	else {
		pimpl_->printError("Bad integer `$$Token'");
		return -1;
	}
}


float LyXLex::GetFloat() const
{
   if (pimpl_->buff[0] > ' ')
       return atof(pimpl_->buff);
   else {
	pimpl_->printError("Bad float `$$Token'");
	return -1;
   }
}


string LyXLex::GetString() const
{
	return pimpl_->GetString();
}


// I would prefer to give a tag number instead of an explicit token
// here, but it is not possible because Buffer::readLyXformat2 uses
// explicit tokens (JMarc) 
string LyXLex::getLongString(string const & endtoken)
{
	string str, prefix;
	bool firstline = true;

	while (IsOK()) {
		if (!EatLine())
			// blank line in the file being read
			continue;
		
		string const token = frontStrip(strip(GetString()), " \t");
		
		lyxerr[Debug::PARSER] << "LongString: `"
				      << GetString() << '\'' << endl;

		// We do a case independent comparison, like search_kw
		// does.
                if (compare_no_case(token, endtoken) != 0) {
			string tmpstr = GetString();
			if (firstline) {
				unsigned int i = 0;
				while(i < tmpstr.length()
				      && tmpstr[i] == ' ') {
					++i;
					prefix += ' ';
				}
				firstline = false;
				lyxerr[Debug::PARSER] << "Prefix = `" << prefix
						      << '\'' << endl;
			} 

			if (!prefix.empty() 
			    && prefixIs(tmpstr, prefix.c_str())) {
				tmpstr.erase(0, prefix.length() - 1);
			}
			str += frontStrip(tmpstr, "\t") + '\n';
                }
		else // token == endtoken
			break;
	}
	if (!IsOK())
		printError("Long string not ended by `" + endtoken + '\'');

	return str;
}


bool LyXLex::GetBool() const
{
	if (compare(pimpl_->buff, "true") == 0)
		return true;
	else if (compare(pimpl_->buff, "false") != 0)
		pimpl_->printError("Bad boolean `$$Token'. Use \"false\" or \"true\"");
	return false;
}


bool LyXLex::EatLine()
{
	return pimpl_->EatLine();
}


bool LyXLex::next(bool esc)
{
	return pimpl_->next(esc);
}


bool LyXLex::nextToken()
{
	return pimpl_->nextToken();
}


void LyXLex::pushToken(string const & pt)
{
	pimpl_->pushToken(pt);
}


int LyXLex::FindToken(char const * str[])
{  
   int i = -1;
   
   if (next()) {
      if (compare(pimpl_->buff, "default")) {
	 for (i = 0; str[i][0] && compare(str[i], pimpl_->buff); ++i);
	 if (!str[i][0]) {
	    pimpl_->printError("Unknown argument `$$Token'");
	    i = -1;
	 }
      }  
   } else
     pimpl_->printError("file ended while scanning string token");
   return i;
}


int LyXLex::CheckToken(char const * str[], int print_error)
{  
   int i = -1;
   
   if (compare(pimpl_->buff, "default")) {
       for (i = 0; str[i][0] && compare(str[i], pimpl_->buff); ++i);
       if (!str[i][0]) {
           if (print_error)
               pimpl_->printError("Unknown argument `$$Token'");
           i = -1;
       }
   }
   return i;
}