/**
* Decodes the next entry, using the previous encountered values to decode the relative values.
*
* @param vals An array of integers that represent values in the entry.
* @param entryValues The number of entries in the array.
* @return The entry object.
*/
private Entry decodeEntry(int[] vals, int entryValues) {
Entry entry;
switch (entryValues) {
// The first values, if present are in the following order:
// 0: the starting column in the current line of the generated file
// 1: the id of the original source file
// 2: the starting line in the original source
// 3: the starting column in the original source
// 4: the id of the original symbol name
// The values are relative to the last encountered value for that field.
// Note: the previously column value for the generated file is reset
// to '0' when a new line is encountered. This is done in the 'build'
// method.
case 1:
// An unmapped section of the generated file.
entry = new UnmappedEntry(vals[0] + previousCol);
// Set the values see for the next entry.
previousCol = entry.getGeneratedColumn();
return entry;
case 4:
// A mapped section of the generated file.
entry =
new UnnamedEntry(
vals[0] + previousCol,
vals[1] + previousSrcId,
vals[2] + previousSrcLine,
vals[3] + previousSrcColumn);
// Set the values see for the next entry.
previousCol = entry.getGeneratedColumn();
previousSrcId = entry.getSourceFileId();
previousSrcLine = entry.getSourceLine();
previousSrcColumn = entry.getSourceColumn();
return entry;
case 5:
// A mapped section of the generated file, that has an associated
// name.
entry =
new NamedEntry(
vals[0] + previousCol,
vals[1] + previousSrcId,
vals[2] + previousSrcLine,
vals[3] + previousSrcColumn,
vals[4] + previousNameId);
// Set the values see for the next entry.
previousCol = entry.getGeneratedColumn();
previousSrcId = entry.getSourceFileId();
previousSrcLine = entry.getSourceLine();
previousSrcColumn = entry.getSourceColumn();
previousNameId = entry.getNameId();
return entry;
default:
throw new IllegalStateException("Unexpected number of values for entry:" + entryValues);
}
}
public void visitMappings(EntryVisitor visitor) {
boolean pending = false;
String sourceName = null;
String symbolName = null;
FilePosition sourceStartPosition = null;
FilePosition startPosition = null;
final int lineCount = lines.size();
for (int i = 0; i < lineCount; i++) {
ArrayList<Entry> line = lines.get(i);
if (line != null) {
final int entryCount = line.size();
for (int j = 0; j < entryCount; j++) {
Entry entry = line.get(j);
if (pending) {
FilePosition endPosition = new FilePosition(i, entry.getGeneratedColumn());
visitor.visit(sourceName, symbolName, sourceStartPosition, startPosition, endPosition);
pending = false;
}
if (entry.getSourceFileId() != UNMAPPED) {
pending = true;
sourceName = sources[entry.getSourceFileId()];
symbolName = (entry.getNameId() != UNMAPPED) ? names[entry.getNameId()] : null;
sourceStartPosition = new FilePosition(entry.getSourceLine(), entry.getSourceColumn());
startPosition = new FilePosition(i, entry.getGeneratedColumn());
}
}
}
}
}
/**
* Reverse the source map; the created mapping will allow us to quickly go from a source file and
* line number to a collection of target OriginalMappings.
*/
private void createReverseMapping() {
reverseSourceMapping = new HashMap<String, Map<Integer, Collection<OriginalMapping>>>();
for (int targetLine = 0; targetLine < lines.size(); targetLine++) {
ArrayList<Entry> entries = lines.get(targetLine);
if (entries != null) {
for (Entry entry : entries) {
if (entry.getSourceFileId() != UNMAPPED && entry.getSourceLine() != UNMAPPED) {
String originalFile = sources[entry.getSourceFileId()];
if (!reverseSourceMapping.containsKey(originalFile)) {
reverseSourceMapping.put(
originalFile, new HashMap<Integer, Collection<OriginalMapping>>());
}
Map<Integer, Collection<OriginalMapping>> lineToCollectionMap =
reverseSourceMapping.get(originalFile);
int sourceLine = entry.getSourceLine();
if (!lineToCollectionMap.containsKey(sourceLine)) {
lineToCollectionMap.put(sourceLine, new ArrayList<OriginalMapping>(1));
}
Collection<OriginalMapping> mappings = lineToCollectionMap.get(sourceLine);
Builder builder =
OriginalMapping.newBuilder()
.setLineNumber(targetLine)
.setColumnPosition(entry.getGeneratedColumn());
mappings.add(builder.build());
}
}
}
}
}
/** Creates an "OriginalMapping" object for the given entry object. */
private OriginalMapping getOriginalMappingForEntry(Entry entry) {
if (entry.getSourceFileId() == UNMAPPED) {
return null;
} else {
// Adjust the line/column here to be start at 1.
Builder x =
OriginalMapping.newBuilder()
.setOriginalFile(sources[entry.getSourceFileId()])
.setLineNumber(entry.getSourceLine() + 1)
.setColumnPosition(entry.getSourceColumn() + 1);
if (entry.getNameId() != UNMAPPED) {
x.setIdentifier(names[entry.getNameId()]);
}
return x.build();
}
}