/**
* Parse the supplied DDL content and return the {@link AstNode root node} of the AST
* representation.
*
* @param ddl content string; may not be null
* @param fileName the approximate name of the file containing the DDL content; may be null if
* this is not known
* @return the root tree {@link AstNode}
* @throws ParsingException if there is an error parsing the supplied DDL content
*/
public AstNode parse(String ddl, String fileName) throws ParsingException {
assert ddl != null;
// Go through each parser and score the DDL content ...
List<ScoredParser> scoredParsers = new LinkedList<ScoredParser>();
for (DdlParser parser : parsers) {
DdlParserScorer scorer = new DdlParserScorer();
try {
Object scoreResult = parser.score(ddl, fileName, scorer);
scoredParsers.add(new ScoredParser(parser, scorer, scoreResult));
} catch (Throwable t) {
// Continue ...
}
}
if (!scoredParsers.isEmpty()) {
Collections.sort(scoredParsers);
} else {
// Just keep the parsers in order ...
for (DdlParser parser : parsers) {
scoredParsers.add(new ScoredParser(parser, new DdlParserScorer(), null));
}
}
// Go through each of the parsers (in order) to parse the content. Start with the first one
// and return if there is no parsing failure; otherwise, just continue with the next parser
// until no failure ...
AstNode astRoot = null;
RuntimeException firstException = null;
for (ScoredParser scoredParser : scoredParsers) {
try {
astRoot = nodeFactory.node(StandardDdlLexicon.STATEMENTS_CONTAINER);
astRoot.setProperty(JcrConstants.JCR_PRIMARY_TYPE, JcrConstants.NT_UNSTRUCTURED);
DdlParser parser = scoredParser.getParser();
parser.parse(ddl, astRoot, scoredParser.getScoringResult());
astRoot.setProperty(StandardDdlLexicon.PARSER_ID, parser.getId());
// Success, so return the resulting AST ...
return astRoot;
} catch (ParsingException t) {
if (firstException == null) firstException = t;
// Continue ...
} catch (RuntimeException t) {
if (firstException == null) firstException = t;
// Continue ...
}
}
if (firstException != null) {
throw firstException;
}
// No exceptions, but nothing was found ...
throw new ParsingException(
new Position(-1, 1, 0), DdlSequencerI18n.errorParsingDdlContent.text());
}
/**
* {@inheritDoc}
*
* @see java.lang.Comparable#compareTo(java.lang.Object)
*/
@Override
public int compareTo(ScoredParser that) {
if (that == null) return 1;
return that.getScorer().getScore() - this.getScorer().getScore();
}
