/* Copyright (C) 2005 J.F.Dockes
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <limits.h>
#include <string>
#include <utility>
#include <list>
#include <set>
#include <vector>
#include <map>
#include <algorithm>
using std::vector;
using std::list;
using std::pair;
using std::set;
#include "rcldb.h"
#include "rclconfig.h"
#include "debuglog.h"
#include "textsplit.h"
#include "utf8iter.h"
#include "smallut.h"
#include "chrono.h"
#include "plaintorich.h"
#include "cancelcheck.h"
#include "unacpp.h"
struct MatchEntry {
// Start/End byte offsets in the document text
pair<int, int> offs;
// Index of the search group this comes from: this is to relate a
// match to the original user input.
size_t grpidx;
MatchEntry(int sta, int sto, size_t idx)
: offs(sta, sto), grpidx(idx)
{
}
};
// Text splitter used to take note of the position of query terms
// inside the result text. This is then used to insert highlight tags.
class TextSplitPTR : public TextSplit {
public:
// Out: begin and end byte positions of query terms/groups in text
vector<MatchEntry> tboffs;
TextSplitPTR(const HighlightData& hdata)
: m_wcount(0), m_hdata(hdata)
{
// We separate single terms and groups and extract the group
// terms for computing positions list before looking for group
// matches
for (vector<vector<string> >::const_iterator vit = hdata.groups.begin();
vit != hdata.groups.end(); vit++) {
if (vit->size() == 1) {
m_terms[vit->front()] = vit - hdata.groups.begin();
} else if (vit->size() > 1) {
for (vector<string>::const_iterator it = vit->begin();
it != vit->end(); it++) {
m_gterms.insert(*it);
}
}
}
}
// Accept word and its position. If word is search term, add
// highlight zone definition. If word is part of search group
// (phrase or near), update positions list.
virtual bool takeword(const std::string& term, int pos, int bts, int bte) {
string dumb = term;
if (o_index_stripchars) {
if (!unacmaybefold(term, dumb, "UTF-8", UNACOP_UNACFOLD)) {
LOGINFO(("PlainToRich::takeword: unac failed for [%s]\n",
term.c_str()));
return true;
}
}
//LOGDEB2(("Input dumbbed term: '%s' %d %d %d\n", dumb.c_str(),
// pos, bts, bte));
// If this word is a search term, remember its byte-offset span.
map<string, size_t>::const_iterator it = m_terms.find(dumb);
if (it != m_terms.end()) {
tboffs.push_back(MatchEntry(bts, bte, (*it).second));
}
// If word is part of a search group, update its positions list
if (m_gterms.find(dumb) != m_gterms.end()) {
// Term group (phrase/near) handling
m_plists[dumb].push_back(pos);
m_gpostobytes[pos] = pair<int,int>(bts, bte);
//LOGDEB2(("Recorded bpos for %d: %d %d\n", pos, bts, bte));
}
// Check for cancellation request
if ((m_wcount++ & 0xfff) == 0)
CancelCheck::instance().checkCancel();
return true;
}
// Must be called after the split to find the phrase/near match positions
virtual bool matchGroups();
private:
virtual bool matchGroup(unsigned int idx);
// Word count. Used to call checkCancel from time to time.
int m_wcount;
// In: user query terms
map<string, size_t> m_terms;
// m_gterms holds all the terms in m_groups, as a set for quick lookup
set<string> m_gterms;
const HighlightData& m_hdata;
// group/near terms word positions.
map<string, vector<int> > m_plists;
map<int, pair<int, int> > m_gpostobytes;
};
/** Sort by shorter comparison class */
class VecIntCmpShorter {
public:
/** Return true if and only if a is strictly shorter than b.
*/
bool operator()(const vector<int> *a, const vector<int> *b) {
return a->size() < b->size();
}
};
#define SETMINMAX(POS, STA, STO) {if ((POS) < (STA)) (STA) = (POS); \
if ((POS) > (STO)) (STO) = (POS);}
// Check that at least an entry from the first position list is inside
// the window and recurse on next list. The window is readjusted as
// the successive terms are found.
//
// @param window the search window width
// @param plists the position list vector
// @param i the position list to process (we then recurse with the next list)
// @param min the current minimum pos for a found term
// @param max the current maximum pos for a found term
// @param sp, ep output: the found area
// @param minpos bottom of search: this is the highest point of
// any previous match. We don't look below this as overlapping matches
// make no sense for highlighting.
static bool do_proximity_test(int window, vector<vector<int>* >& plists,
unsigned int i, int min, int max,
int *sp, int *ep, int minpos)
{
LOGDEB1(("do_prox_test: win %d i %d min %d max %d minpos %d\n",
window, i, min, max, minpos));
int tmp = max + 1 - window;
if (tmp < minpos)
tmp = minpos;
// Find 1st position bigger than window start
vector<int>::iterator it = plists[i]->begin();
while (it != plists[i]->end() && *it < tmp)
it++;
// Look for position inside window. If not found, no match. If
// found: if this is the last list we're done, else recurse on
// next list after adjusting the window
while (it != plists[i]->end()) {
int pos = *it;
if (pos > min + window - 1)
return false;
if (i + 1 == plists.size()) {
SETMINMAX(pos, *sp, *ep);
return true;
}
SETMINMAX(pos, min, max);
if (do_proximity_test(window,plists, i + 1, min, max, sp, ep, minpos)) {
SETMINMAX(pos, *sp, *ep);
return true;
}
it++;
}
return false;
}
// Find NEAR matches for one group of terms, update highlight map
bool TextSplitPTR::matchGroup(unsigned int grpidx)
{
const vector<string>& terms = m_hdata.groups[grpidx];
int window = int(m_hdata.groups[grpidx].size() + m_hdata.slacks[grpidx]);
LOGDEB1(("TextSplitPTR::matchGroup:d %d: %s\n", window,
vecStringToString(terms).c_str()));
// The position lists we are going to work with. We extract them from the
// (string->plist) map
vector<vector<int>* > plists;
// A revert plist->term map. This is so that we can find who is who after
// sorting the plists by length.
map<vector<int>*, string> plistToTerm;
// Find the position list for each term in the group. It is
// possible that this particular group was not actually matched by
// the search, so that some terms are not found.
for (vector<string>::const_iterator it = terms.begin();
it != terms.end(); it++) {
map<string, vector<int> >::iterator pl = m_plists.find(*it);
if (pl == m_plists.end()) {
LOGDEB1(("TextSplitPTR::matchGroup: [%s] not found in m_plists\n",
(*it).c_str()));
return false;
}
plists.push_back(&(pl->second));
plistToTerm[&(pl->second)] = *it;
}
// I think this can't actually happen, was useful when we used to
// prune the groups, but doesn't hurt.
if (plists.size() < 2) {
LOGDEB1(("TextSplitPTR::matchGroup: no actual groups found\n"));
return false;
}
// Sort the positions lists so that the shorter is first
std::sort(plists.begin(), plists.end(), VecIntCmpShorter());
{ // Debug
map<vector<int>*, string>::iterator it;
it = plistToTerm.find(plists[0]);
if (it == plistToTerm.end()) {
// SuperWeird
LOGERR(("matchGroup: term for first list not found !?!\n"));
return false;
}
LOGDEB1(("matchGroup: walking the shortest plist. Term [%s], len %d\n",
it->second.c_str(), plists[0]->size()));
}
// Minpos is the highest end of a found match. While looking for
// further matches, we don't want the search to extend before
// this, because it does not make sense for highlight regions to
// overlap
int minpos = 0;
// Walk the shortest plist and look for matches
for (vector<int>::iterator it = plists[0]->begin();
it != plists[0]->end(); it++) {
int pos = *it;
int sta = INT_MAX, sto = 0;
LOGDEB2(("MatchGroup: Testing at pos %d\n", pos));
if (do_proximity_test(window,plists, 1, pos, pos, &sta, &sto, minpos)) {
LOGDEB1(("TextSplitPTR::matchGroup: MATCH termpos [%d,%d]\n",
sta, sto));
// Maybe extend the window by 1st term position, this was not
// done by do_prox..
SETMINMAX(pos, sta, sto);
minpos = sto+1;
// Translate the position window into a byte offset window
map<int, pair<int, int> >::iterator i1 = m_gpostobytes.find(sta);
map<int, pair<int, int> >::iterator i2 = m_gpostobytes.find(sto);
if (i1 != m_gpostobytes.end() && i2 != m_gpostobytes.end()) {
LOGDEB2(("TextSplitPTR::matchGroup: pushing bpos %d %d\n",
i1->second.first, i2->second.second));
tboffs.push_back(MatchEntry(i1->second.first,
i2->second.second, grpidx));
} else {
LOGDEB0(("matchGroup: no bpos found for %d or %d\n", sta, sto));
}
} else {
LOGDEB1(("matchGroup: no group match found at this position\n"));
}
}
return true;
}
/** Sort integer pairs by increasing first value and decreasing width */
class PairIntCmpFirst {
public:
bool operator()(const MatchEntry& a, const MatchEntry& b) {
if (a.offs.first != b.offs.first)
return a.offs.first < b.offs.first;
return a.offs.second > b.offs.second;
}
};
// Look for matches to PHRASE and NEAR term groups and finalize the
// matched regions list (sort it by increasing start then decreasing
// length)
// Actually, we handle all groups as NEAR (ignore order).
bool TextSplitPTR::matchGroups()
{
for (unsigned int i = 0; i < m_hdata.groups.size(); i++) {
if (m_hdata.groups[i].size() <= 1)
continue;
matchGroup(i);
}
// Sort regions by increasing start and decreasing width.
// The output process will skip overlapping entries.
std::sort(tboffs.begin(), tboffs.end(), PairIntCmpFirst());
return true;
}
// Fix result text for display inside the gui text window.
//
// We call overridden functions to output header data, beginnings and ends of
// matches etc.
//
// If the input is text, we output the result in chunks, arranging not
// to cut in the middle of a tag, which would confuse qtextedit. If
// the input is html, the body is always a single output chunk.
bool PlainToRich::plaintorich(const string& in,
list<string>& out, // Output chunk list
const HighlightData& hdata,
int chunksize)
{
Chrono chron;
bool ret = true;
LOGDEB1(("plaintorichich: in: [%s]\n", in.c_str()));
m_hdata = &hdata;
// Compute the positions for the query terms. We use the text
// splitter to break the text into words, and compare the words to
// the search terms,
TextSplitPTR splitter(hdata);
// Note: the splitter returns the term locations in byte, not
// character, offsets.
splitter.text_to_words(in);
LOGDEB2(("plaintorich: split done %d mS\n", chron.millis()));
// Compute the positions for NEAR and PHRASE groups.
splitter.matchGroups();
LOGDEB2(("plaintorich: group match done %d mS\n", chron.millis()));
out.clear();
out.push_back("");
list<string>::iterator olit = out.begin();
// Rich text output
*olit = header();
// No term matches. Happens, for example on a snippet selected for
// a term match when we are actually looking for a group match
// (the snippet generator does this...).
if (splitter.tboffs.empty()) {
LOGDEB1(("plaintorich: no term matches\n"));
ret = false;
}
// Iterator for the list of input term positions. We use it to
// output highlight tags and to compute term positions in the
// output text
vector<MatchEntry>::iterator tPosIt = splitter.tboffs.begin();
vector<MatchEntry>::iterator tPosEnd = splitter.tboffs.end();
#if 0
for (vector<pair<int, int> >::const_iterator it = splitter.tboffs.begin();
it != splitter.tboffs.end(); it++) {
LOGDEB2(("plaintorich: region: %d %d\n", it->first, it->second));
}
#endif
// Input character iterator
Utf8Iter chariter(in);
// State variables used to limit the number of consecutive empty lines,
// convert all eol to '\n', and preserve some indentation
int eol = 0;
int hadcr = 0;
int inindent = 1;
// HTML state
bool intag = false, inparamvalue = false;
// My tag state
int inrcltag = 0;
string::size_type headend = 0;
if (m_inputhtml) {
headend = in.find("</head>");
if (headend == string::npos)
headend = in.find("</HEAD>");
if (headend != string::npos)
headend += 7;
}
for (string::size_type pos = 0; pos != string::npos; pos = chariter++) {
// Check from time to time if we need to stop
if ((pos & 0xfff) == 0) {
CancelCheck::instance().checkCancel();
}
// If we still have terms positions, check (byte) position. If
// we are at or after a term match, mark.
if (tPosIt != tPosEnd) {
int ibyteidx = int(chariter.getBpos());
if (ibyteidx == tPosIt->offs.first) {
if (!intag && ibyteidx >= (int)headend) {
*olit += startMatch((unsigned int)(tPosIt->grpidx));
}
inrcltag = 1;
} else if (ibyteidx == tPosIt->offs.second) {
// Output end of match region tags
if (!intag && ibyteidx > (int)headend) {
*olit += endMatch();
}
// Skip all highlight areas that would overlap this one
int crend = tPosIt->offs.second;
while (tPosIt != splitter.tboffs.end() &&
tPosIt->offs.first < crend)
tPosIt++;
inrcltag = 0;
}
}
unsigned int car = *chariter;
if (car == '\n') {
if (!hadcr)
eol++;
hadcr = 0;
continue;
} else if (car == '\r') {
hadcr++;
eol++;
continue;
} else if (eol) {
// Got non eol char in line break state. Do line break;
inindent = 1;
hadcr = 0;
if (eol > 2)
eol = 2;
while (eol) {
if (!m_inputhtml && m_eolbr)
*olit += "<br>";
*olit += "\n";
eol--;
}
// Maybe end this chunk, begin next. Don't do it on html
// there is just no way to do it right (qtextedit cant grok
// chunks cut in the middle of <a></a> for example).
if (!m_inputhtml && !inrcltag &&
olit->size() > (unsigned int)chunksize) {
out.push_back(string(startChunk()));
olit++;
}
}
switch (car) {
case '<':
inindent = 0;
if (m_inputhtml) {
if (!inparamvalue)
intag = true;
chariter.appendchartostring(*olit);
} else {
*olit += "<";
}
break;
case '>':
inindent = 0;
if (m_inputhtml) {
if (!inparamvalue)
intag = false;
}
chariter.appendchartostring(*olit);
break;
case '&':
inindent = 0;
if (m_inputhtml) {
chariter.appendchartostring(*olit);
} else {
*olit += "&";
}
break;
case '"':
inindent = 0;
if (m_inputhtml && intag) {
inparamvalue = !inparamvalue;
}
chariter.appendchartostring(*olit);
break;
case ' ':
if (m_eolbr && inindent) {
*olit += " ";
} else {
chariter.appendchartostring(*olit);
}
break;
case '\t':
if (m_eolbr && inindent) {
*olit += " ";
} else {
chariter.appendchartostring(*olit);
}
break;
default:
inindent = 0;
chariter.appendchartostring(*olit);
}
} // End chariter loop
#if 0
{
FILE *fp = fopen("/tmp/debugplaintorich", "a");
fprintf(fp, "BEGINOFPLAINTORICHOUTPUT\n");
for (list<string>::iterator it = out.begin();
it != out.end(); it++) {
fprintf(fp, "BEGINOFPLAINTORICHCHUNK\n");
fprintf(fp, "%s", it->c_str());
fprintf(fp, "ENDOFPLAINTORICHCHUNK\n");
}
fprintf(fp, "ENDOFPLAINTORICHOUTPUT\n");
fclose(fp);
}
#endif
LOGDEB2(("plaintorich: done %d mS\n", chron.millis()));
return ret;
}