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CONCORD.CPP
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1997-02-28
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/**************************************************************************
*
* concord.cpp - Concordance sample program. Section 9.3.3
*
* $Id: concord.cpp,v 1.5 1995/08/29 19:01:16 oberg Exp $
*
* $$RW_INSERT_HEADER "slyrs.cpp"
*
**************************************************************************/
# include <map>
# include <list>
# include <iostream.h>
# include <string>
using namespace std;
// define < for strings
bool operator < (const string & left, const string & right)
{ return left.compare(right) < 0; }
// split a line of text into words
void split
(const string & text, const string & separators, list<string> & words)
{
int n = text.length();
int start, stop;
start = text.find_first_not_of(separators);
while ((start >= 0) && (start < n)) {
stop = text.find_first_of(separators, start);
if ((stop < 0) || (stop > n)) stop = n;
words.push_back (text.substr(start, stop-start));
start = text.find_first_not_of(separators, stop+1);
}
}
class concordance {
typedef multimap<string, int, less<string> > wordDictType;
public:
void addWord (string, int);
void readText (istream &);
void printConcordance (ostream &);
private:
wordDictType wordMap;
};
void concordance::addWord (string word, int line)
{
// see if word occurs in list
// first get range of entries with same key
wordDictType::iterator low = wordMap.lower_bound(word);
wordDictType::iterator high = wordMap.upper_bound(word);
// loop over entires, see if any match current line
for ( ; low != high; ++low)
if ((*low).second == line)
return;
// didn't occur, add now
wordMap.insert(wordDictType::value_type(word, line));
}
# include <ctype.h>
void allLower (string & s)
{
for (int i = 0; i < s.size(); i++)
if (isupper(s[i]))
s[i] = tolower(s[i]);
}
void concordance::readText (istream & in)
{
string line;
for (int i = 1; getline(in, line, '\n'); i++) {
allLower(line);
list<string> words;
split(line, " ,.;:", words);
list<string>::iterator wptr;
for (wptr = words.begin(); wptr != words.end(); ++wptr)
addWord(*wptr, i);
}
}
void concordance::printConcordance (ostream & out)
{
string lastword("");
wordDictType::iterator pairPtr;
wordDictType::iterator stop = wordMap.end();
for (pairPtr = wordMap.begin(); pairPtr != stop; ++pairPtr)
// if word is same as previous, just print line number
if (lastword == (*pairPtr).first)
out << " " << (*pairPtr).second;
else { // first entry of word
lastword = (*pairPtr).first;
cout << endl << lastword << ": " << (*pairPtr).second;
}
cout << endl; // terminate last line
}
int main() {
cout << "Concordance sample program, from Chapter 7" << endl;
cout << "Enter text, then end-of-file:" << endl;
concordance words;
words.readText(cin);
words.printConcordance(cout);
cout << "End of concordance sample program" << endl;
return 0;
}