** \verbatim
** Original author: Christopher L. Conway
** Major contributors: Morgan Deters
- ** Minor contributors (to current version): Francois Bobot
+ ** Minor contributors (to current version): Francois Bobot, Kshitij Bansal
** This file is part of the CVC4 project.
- ** Copyright (c) 2009-2013 New York University and The University of Iowa
+ ** Copyright (c) 2009-2014 New York University and The University of Iowa
** See the file COPYING in the top-level source directory for licensing
** information.\endverbatim
**
Warning() << getInputStream()->getName() << ':' << d_lexer->getLine(d_lexer) << '.' << d_lexer->getCharPositionInLine(d_lexer) << ": " << message << endl;
}
+
+/**
+ * characters considered part of a simple symbol in SMTLIB.
+ *
+ * TODO: Ideally this code shouldn't be smtlib specific (should work
+ * with CVC language too), but this per-language specialization has
+ * been left for a later point.
+ */
+inline bool isSimpleChar(char ch) {
+ return isalnum(ch) || (strchr("~!@$%^&*_-+=<>.?/", ch) != NULL);
+}
+
+/**
+ * Gets part of original input and tries to visually hint where the
+ * error might be.
+ *
+ * Something like:
+ *
+ * ...nd (= alpha beta) (= beta delta))
+ * ^
+ *
+ * Implementation (as on 2014/04/24):
+ *
+ * > if suggested pointer by lexer is under a "simple char", move to
+ * start of the word and print pointer there.
+ *
+ * > in the other case, it tries to find the nearest word in the error
+ * message passed along. if it can't find it, we don't add this
+ * visual hint, as experimentally position suggested by lexer was
+ * found to be totally unhelpful. (TODO: fix this upstream to
+ * improve)
+ */
+std::string parseErrorHelper(const char* lineStart, int charPositionInLine, const std::string& message)
+{
+ // Is it a multi-line message
+ bool multilineMessage = (message.find('\n') != string::npos);
+ // Useful only if it is a multi-line message
+ int firstLineEnd = message.find('\n');
+
+ std::ostringstream ss, slicess;
+
+ // Keep first line of message
+ if(multilineMessage) {
+ ss << message.substr(0, firstLineEnd) << endl << endl;
+ } else {
+ ss << message << endl << endl;
+ }
+
+ int posSliceStart = (charPositionInLine - 50 <= 0) ? 0 : charPositionInLine - 50 + 5;
+ int posSliceEnd = posSliceStart + 70;
+ int caretPos = 0;
+ int caretPosExtra = 0; // for inital intendation, epilipses etc.
+
+ ss << " "; caretPosExtra += 2;
+ if(posSliceStart > 0) {
+ ss << "..."; caretPosExtra += 3;
+ }
+
+ for(int i = posSliceStart; lineStart[i] != '\n'; ++i) {
+ if(i == posSliceEnd) {
+ ss << "...";
+ break;
+ }
+ if(i < charPositionInLine) { caretPos++; }
+
+ if(!isprint(lineStart[i])) {
+ // non-printable character, something wrong, bail out
+ return message;
+ }
+
+ ss << (lineStart[i]);
+ slicess << (lineStart[i]);
+ }
+
+ // adjust position of caret, based on slice and message
+ {
+ int caretPosOrig = caretPos;
+ string slice = slicess.str();
+ if(isSimpleChar(slice[caretPos])) {
+ // if alphanumeric, try to go to beginning of word/number
+ while(caretPos > 0 && isSimpleChar(slice[caretPos - 1])) { --caretPos; }
+ if(caretPos == 0 && posSliceStart > 0) {
+ // reached start and this is not really the start? bail out
+ return message;
+ } else {
+ // likely it is also in original message? if so, very likely
+ // we found the right place
+ string word = slice.substr(caretPos, (caretPosOrig - caretPos + 1));
+ int messagePosSt = message.find(word);
+ int messagePosEn = messagePosSt + (caretPosOrig - caretPos);
+ if( messagePosSt < string::npos &&
+ (messagePosSt == 0 || !isSimpleChar(message[messagePosSt-1]) ) &&
+ (messagePosEn+1 == message.size() || !isSimpleChar(message[messagePosEn+1]) ) ) {
+ // ^the complicated if statement is just 'whole-word' match
+ Debug("friendlyparser") << "[friendlyparser] Feeling good." << std::endl;
+ }
+ }
+ } else {
+ // go to nearest alphanumeric string (before current position),
+ // see if that word can be found in original message. If so,
+ // point to that, else keep pointer where it was.
+ int nearestWordEn = caretPos - 1;
+ while(nearestWordEn > 0 && !isSimpleChar(slice[nearestWordEn])) {
+ --nearestWordEn;
+ }
+ if(isSimpleChar(slice[nearestWordEn])) {
+ int nearestWordSt = nearestWordEn;
+ while(nearestWordSt > 0 && isSimpleChar(slice[nearestWordSt - 1])) {
+ --nearestWordSt;
+ }
+ string word = slice.substr(nearestWordSt, (nearestWordEn - nearestWordSt + 1));
+ Debug("friendlyparser") << "[friendlyparser] nearest word = " << word << std::endl;
+ int messagePosSt = message.find(word);
+ int messagePosEn = messagePosSt + (nearestWordEn - nearestWordSt + 1);
+ if( messagePosSt < string::npos &&
+ (messagePosSt == 0 || !isSimpleChar(message[messagePosSt-1]) ) &&
+ (messagePosEn+1 == message.size() || !isSimpleChar(message[messagePosEn+1]) ) ) {
+ // ^the complicated if statement is just 'whole-word' match
+ Debug("friendlyparser") << "[friendlyparser] strong evidence that caret should be at "
+ << nearestWordSt << std::endl;
+ caretPos = nearestWordSt;
+ } else {
+ // this doesn't look good. caret generally getting printed
+ // at unhelpful positions. improve upstream?
+ return message;
+ }
+ }
+ }
+ caretPos += caretPosExtra;
+ }// end of caret position computation/heuristics
+
+ ss << std::endl;
+ while( caretPos-- > 0 ) {
+ ss << ' ';
+ }
+ ss << '^' << endl;
+ if(multilineMessage) {
+ ss << message.substr(firstLineEnd, message.size() - firstLineEnd);;
+ }
+ return ss.str();
+}
+
void AntlrInput::parseError(const std::string& message, bool eofException)
throw (ParserException) {
+
+ string updatedMessage = parseErrorHelper((const char*)d_antlr3InputStream->getLineBuf(d_antlr3InputStream),
+ d_lexer->getCharPositionInLine(d_lexer),
+ message);
+
Debug("parser") << "Throwing exception: "
<< (const char*)d_lexer->rec->state->tokSource->fileName->chars << ":"
<< d_lexer->getLine(d_lexer) << "."
<< d_lexer->getCharPositionInLine(d_lexer) << ": "
- << message << endl;
+ << updatedMessage << endl;
if(eofException) {
throw ParserEndOfFileException(message,
(const char*)d_lexer->rec->state->tokSource->fileName->chars,
d_lexer->getLine(d_lexer),
d_lexer->getCharPositionInLine(d_lexer));
} else {
- throw ParserException(message,
+ throw ParserException(updatedMessage,
(const char*)d_lexer->rec->state->tokSource->fileName->chars,
d_lexer->getLine(d_lexer),
d_lexer->getCharPositionInLine(d_lexer));
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