in org.eclipse.jgit/src/org/eclipse/jgit/lib/Repository.java [510:814]
private Object resolve(RevWalk rw, String revstr)
throws IOException {
char[] revChars = revstr.toCharArray();
RevObject rev = null;
String name = null;
int done = 0;
for (int i = 0; i < revChars.length; ++i) {
switch (revChars[i]) {
case '^':
if (rev == null) {
if (name == null)
if (done == 0)
name = new String(revChars, done, i);
else {
done = i + 1;
break;
}
rev = parseSimple(rw, name);
name = null;
if (rev == null)
return null;
}
if (i + 1 < revChars.length) {
switch (revChars[i + 1]) {
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
int j;
rev = rw.parseCommit(rev);
for (j = i + 1; j < revChars.length; ++j) {
if (!Character.isDigit(revChars[j]))
break;
}
String parentnum = new String(revChars, i + 1, j - i
- 1);
int pnum;
try {
pnum = Integer.parseInt(parentnum);
} catch (NumberFormatException e) {
RevisionSyntaxException rse = new RevisionSyntaxException(
JGitText.get().invalidCommitParentNumber,
revstr);
rse.initCause(e);
throw rse;
}
if (pnum != 0) {
RevCommit commit = (RevCommit) rev;
if (pnum > commit.getParentCount())
rev = null;
else
rev = commit.getParent(pnum - 1);
}
i = j - 1;
done = j;
break;
case '{':
int k;
String item = null;
for (k = i + 2; k < revChars.length; ++k) {
if (revChars[k] == '}') {
item = new String(revChars, i + 2, k - i - 2);
break;
}
}
i = k;
if (item != null)
if (item.equals("tree")) { //$NON-NLS-1$
rev = rw.parseTree(rev);
} else if (item.equals("commit")) { //$NON-NLS-1$
rev = rw.parseCommit(rev);
} else if (item.equals("blob")) { //$NON-NLS-1$
rev = rw.peel(rev);
if (!(rev instanceof RevBlob))
throw new IncorrectObjectTypeException(rev,
Constants.TYPE_BLOB);
} else if (item.isEmpty()) {
rev = rw.peel(rev);
} else
throw new RevisionSyntaxException(revstr);
else
throw new RevisionSyntaxException(revstr);
done = k;
break;
default:
rev = rw.peel(rev);
if (rev instanceof RevCommit) {
RevCommit commit = ((RevCommit) rev);
if (commit.getParentCount() == 0)
rev = null;
else
rev = commit.getParent(0);
} else
throw new IncorrectObjectTypeException(rev,
Constants.TYPE_COMMIT);
}
} else {
rev = rw.peel(rev);
if (rev instanceof RevCommit) {
RevCommit commit = ((RevCommit) rev);
if (commit.getParentCount() == 0)
rev = null;
else
rev = commit.getParent(0);
} else
throw new IncorrectObjectTypeException(rev,
Constants.TYPE_COMMIT);
}
done = i + 1;
break;
case '~':
if (rev == null) {
if (name == null)
if (done == 0)
name = new String(revChars, done, i);
else {
done = i + 1;
break;
}
rev = parseSimple(rw, name);
name = null;
if (rev == null)
return null;
}
rev = rw.peel(rev);
if (!(rev instanceof RevCommit))
throw new IncorrectObjectTypeException(rev,
Constants.TYPE_COMMIT);
int l;
for (l = i + 1; l < revChars.length; ++l) {
if (!Character.isDigit(revChars[l]))
break;
}
int dist;
if (l - i > 1) {
String distnum = new String(revChars, i + 1, l - i - 1);
try {
dist = Integer.parseInt(distnum);
} catch (NumberFormatException e) {
RevisionSyntaxException rse = new RevisionSyntaxException(
JGitText.get().invalidAncestryLength, revstr);
rse.initCause(e);
throw rse;
}
} else
dist = 1;
while (dist > 0) {
RevCommit commit = (RevCommit) rev;
if (commit.getParentCount() == 0) {
rev = null;
break;
}
commit = commit.getParent(0);
rw.parseHeaders(commit);
rev = commit;
--dist;
}
i = l - 1;
done = l;
break;
case '@':
if (rev != null)
throw new RevisionSyntaxException(revstr);
if (i + 1 == revChars.length)
continue;
if (i + 1 < revChars.length && revChars[i + 1] != '{')
continue;
int m;
String time = null;
for (m = i + 2; m < revChars.length; ++m) {
if (revChars[m] == '}') {
time = new String(revChars, i + 2, m - i - 2);
break;
}
}
if (time != null) {
if (time.equals("upstream")) { //$NON-NLS-1$
if (name == null)
name = new String(revChars, done, i);
if (name.isEmpty())
// Currently checked out branch, HEAD if
// detached
name = Constants.HEAD;
if (!Repository.isValidRefName("x/" + name)) //$NON-NLS-1$
throw new RevisionSyntaxException(MessageFormat
.format(JGitText.get().invalidRefName,
name),
revstr);
Ref ref = findRef(name);
name = null;
if (ref == null)
return null;
if (ref.isSymbolic())
ref = ref.getLeaf();
name = ref.getName();
RemoteConfig remoteConfig;
try {
remoteConfig = new RemoteConfig(getConfig(),
"origin"); //$NON-NLS-1$
} catch (URISyntaxException e) {
RevisionSyntaxException rse = new RevisionSyntaxException(
revstr);
rse.initCause(e);
throw rse;
}
String remoteBranchName = getConfig()
.getString(
ConfigConstants.CONFIG_BRANCH_SECTION,
Repository.shortenRefName(ref.getName()),
ConfigConstants.CONFIG_KEY_MERGE);
List<RefSpec> fetchRefSpecs = remoteConfig
.getFetchRefSpecs();
for (RefSpec refSpec : fetchRefSpecs) {
if (refSpec.matchSource(remoteBranchName)) {
RefSpec expandFromSource = refSpec
.expandFromSource(remoteBranchName);
name = expandFromSource.getDestination();
break;
}
}
if (name == null)
throw new RevisionSyntaxException(revstr);
} else if (time.matches("^-\\d+$")) { //$NON-NLS-1$
if (name != null) {
throw new RevisionSyntaxException(revstr);
}
String previousCheckout = resolveReflogCheckout(
-Integer.parseInt(time));
if (ObjectId.isId(previousCheckout)) {
rev = parseSimple(rw, previousCheckout);
} else {
name = previousCheckout;
}
} else {
if (name == null)
name = new String(revChars, done, i);
if (name.isEmpty())
name = Constants.HEAD;
if (!Repository.isValidRefName("x/" + name)) //$NON-NLS-1$
throw new RevisionSyntaxException(MessageFormat
.format(JGitText.get().invalidRefName,
name),
revstr);
Ref ref = findRef(name);
name = null;
if (ref == null)
return null;
// @{n} means current branch, not HEAD@{1} unless
// detached
if (ref.isSymbolic())
ref = ref.getLeaf();
rev = resolveReflog(rw, ref, time);
}
i = m;
} else
throw new RevisionSyntaxException(revstr);
break;
case ':': {
RevTree tree;
if (rev == null) {
if (name == null)
name = new String(revChars, done, i);
if (name.isEmpty())
name = Constants.HEAD;
rev = parseSimple(rw, name);
name = null;
}
if (rev == null)
return null;
tree = rw.parseTree(rev);
if (i == revChars.length - 1)
return tree.copy();
TreeWalk tw = TreeWalk.forPath(rw.getObjectReader(),
new String(revChars, i + 1, revChars.length - i - 1),
tree);
return tw != null ? tw.getObjectId(0) : null;
}
default:
if (rev != null)
throw new RevisionSyntaxException(revstr);
}
}
if (rev != null)
return rev.copy();
if (name != null)
return name;
if (done == revstr.length())
return null;
name = revstr.substring(done);
if (!Repository.isValidRefName("x/" + name)) //$NON-NLS-1$
throw new RevisionSyntaxException(
MessageFormat.format(JGitText.get().invalidRefName, name),
revstr);
if (findRef(name) != null)
return name;
return resolveSimple(name);
}