private void parseField(BibEntry entry) throws IOException {
String key = parseTextToken().toLowerCase();
skipWhitespace();
consume('=');
String content = parseFieldContent(key);
if (!content.isEmpty()) {
if (entry.hasField(key)) {
// The following hack enables the parser to deal with multiple
// author or
// editor lines, stringing them together instead of getting just
// one of them.
// Multiple author or editor lines are not allowed by the bibtex
// format, but
// at least one online database exports bibtex like that, making
// it inconvenient
// for users if JabRef didn't accept it.
if (InternalBibtexFields.getFieldExtras(key).contains(FieldProperties.PERSON_NAMES)) {
entry.setField(key, entry.getFieldOptional(key).get() + " and " + content);
} else if (FieldName.KEYWORDS.equals(key)) {
// multiple keywords fields should be combined to one
entry.addKeyword(content, Globals.prefs.get(JabRefPreferences.KEYWORD_SEPARATOR));
}
} else {
entry.setField(key, content);
}
}
}
private ParserResult parseFileContent() throws IOException {
Map<String, String> meta = new HashMap<>();
while (!eof) {
boolean found = consumeUncritically('@');
if (!found) {
break;
}
skipWhitespace();
// Try to read the entry type
String entryType = parseTextToken().toLowerCase().trim();
if ("preamble".equals(entryType)) {
database.setPreamble(parsePreamble());
// Consume new line which signals end of preamble
skipOneNewline();
// the preamble is saved verbatim anyways, so the text read so far can be dropped
dumpTextReadSoFarToString();
} else if ("string".equals(entryType)) {
parseBibtexString();
} else if ("comment".equals(entryType)) {
parseJabRefComment(meta);
} else {
// Not a comment, preamble, or string. Thus, it is an entry
parseAndAddEntry(entryType);
}
skipWhitespace();
}
// Instantiate meta data:
try {
parserResult.setMetaData(MetaData.parse(meta));
} catch (ParseException exception) {
parserResult.addWarning(exception.getLocalizedMessage());
}
parseRemainingContent();
return parserResult;
}
private BibtexString parseString() throws IOException {
skipWhitespace();
consume('{', '(');
skipWhitespace();
LOGGER.debug("Parsing string name");
String name = parseTextToken();
LOGGER.debug("Parsed string name");
skipWhitespace();
LOGGER.debug("Now the contents");
consume('=');
String content = parseFieldContent(name);
LOGGER.debug("Now I'm going to consume a }");
consume('}', ')');
// Consume new line which signals end of entry
skipOneNewline();
LOGGER.debug("Finished string parsing.");
String id = IdGenerator.next();
return new BibtexString(id, name, content);
}
private String parseFieldContent(String key) throws IOException {
skipWhitespace();
StringBuilder value = new StringBuilder();
int character;
while (((character = peek()) != ',') && (character != '}') && (character != ')')) {
if (eof) {
throw new IOException("Error in line " + line + ": EOF in mid-string");
}
if (character == '"') {
StringBuilder text = parseQuotedFieldExactly();
value.append(fieldContentParser.format(text, key));
} else if (character == '{') {
// Value is a string enclosed in brackets. There can be pairs
// of brackets inside of a field, so we need to count the
// brackets to know when the string is finished.
StringBuilder text = parseBracketedTextExactly();
value.append(fieldContentParser.format(text, key));
} else if (Character.isDigit((char) character)) { // value is a number
String number = parseTextToken();
value.append(number);
} else if (character == '#') {
consume('#');
} else {
String textToken = parseTextToken();
if (textToken.isEmpty()) {
throw new IOException(
"Error in line "
+ line
+ " or above: "
+ "Empty text token.\nThis could be caused "
+ "by a missing comma between two fields.");
}
value.append('#').append(textToken).append('#');
}
skipWhitespace();
}
return value.toString();
}
private BibEntry parseEntry(String entryType) throws IOException {
String id = IdGenerator.next();
BibEntry result = new BibEntry(id, entryType);
skipWhitespace();
consume('{', '(');
int character = peek();
if ((character != '\n') && (character != '\r')) {
skipWhitespace();
}
String key = parseKey();
result.setCiteKey(key);
skipWhitespace();
while (true) {
character = peek();
if ((character == '}') || (character == ')')) {
break;
}
if (character == ',') {
consume(',');
}
skipWhitespace();
character = peek();
if ((character == '}') || (character == ')')) {
break;
}
parseField(result);
}
consume('}', ')');
// Consume new line which signals end of entry
skipOneNewline();
return result;
}
/**
* Will parse the BibTex-Data found when reading from reader. Ignores any encoding supplied in the
* file by "Encoding: myEncoding".
*
* <p>The reader will be consumed.
*
* <p>Multiple calls to parse() return the same results
*
* @return ParserResult
* @throws IOException
*/
public ParserResult parse() throws IOException {
// If we already parsed this, just return it.
if (parserResult != null) {
return parserResult;
}
// Bibtex related contents.
initializeParserResult();
skipWhitespace();
try {
return parseFileContent();
} catch (KeyCollisionException kce) {
throw new IOException("Duplicate ID in bibtex file: " + kce);
}
}
private String parsePreamble() throws IOException {
skipWhitespace();
return parseBracketedText().toString();
}