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/*
* Copyright 2011 The Closure Compiler Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.debugging.sourcemap;
import static com.google.common.base.Preconditions.checkState;
import static com.google.common.base.Strings.nullToEmpty;
import com.google.common.base.Preconditions;
import com.google.debugging.sourcemap.SourceMapConsumerV3.EntryVisitor;
import java.io.IOException;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Deque;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Objects;
import javax.annotation.Nullable;
/**
* Collects information mapping the generated (compiled) source back to
* its original source for debugging purposes.
*
* Source Map Revision 3 Proposal:
* https://docs.google.com/document/d/1U1RGAehQwRypUTovF1KRlpiOFze0b-_2gc6fAH0KY0k/edit?usp=sharing
*/
public final class SourceMapGeneratorV3 implements SourceMapGenerator {
/**
* This interface provides the merging strategy when an extension conflict
* appears because of merging two source maps on method
* {@link #mergeMapSection}.
*/
public interface ExtensionMergeAction {
/**
* Returns the merged value between two extensions with the same name when
* merging two source maps
*
* @param extensionKey The extension name in conflict
* @param currentValue The extension value in the current source map
* @param newValue The extension value in the input source map
* @return The merged value
*/
Object merge(String extensionKey, Object currentValue,
Object newValue);
}
private static final int UNMAPPED = -1;
/**
* A pre-order traversal ordered list of mappings stored in this map.
*/
private final List mappings = new ArrayList<>();
/**
* A map of source names to source name index
*/
private final LinkedHashMap sourceFileMap =
new LinkedHashMap<>();
/**
* A map of source names to source file contents
*/
private final LinkedHashMap sourceFileContentMap =
new LinkedHashMap<>();
/**
* A map of source names to source name index
*/
private final LinkedHashMap originalNameMap =
new LinkedHashMap<>();
/**
* Cache of the last mappings source name.
*/
private String lastSourceFile = null;
/**
* Cache of the last mappings source name index.
*/
private int lastSourceFileIndex = -1;
/**
* For validation store the last mapping added.
*/
private Mapping lastMapping;
/**
* The position that the current source map is offset in the
* buffer being used to generated the compiled source file.
*/
private FilePosition offsetPosition = new FilePosition(0, 0);
/**
* The position that the current source map is offset in the
* generated the compiled source file by the addition of a
* an output wrapper prefix.
*/
private FilePosition prefixPosition = new FilePosition(0, 0);
/**
* A list of extensions to be added to sourcemap. The value is a object
* to permit single values, like strings or numbers, and JsonObject or
* JsonArray objects.
*/
private final LinkedHashMap extensions = new LinkedHashMap<>();
/**
* The source root path for relocating source fails or avoid duplicate values
* on the source entry.
*/
private String sourceRootPath;
/**
* {@inheritDoc}
*/
@Override
public void reset() {
mappings.clear();
lastMapping = null;
sourceFileMap.clear();
sourceFileContentMap.clear();
originalNameMap.clear();
lastSourceFile = null;
lastSourceFileIndex = -1;
offsetPosition = new FilePosition(0, 0);
prefixPosition = new FilePosition(0, 0);
}
/**
* @param validate Whether to perform (potentially costly) validation on the
* generated source map.
*/
@Override
public void validate(boolean validate) {
// Nothing currently.
}
/**
* Sets the prefix used for wrapping the generated source file before
* it is written. This ensures that the source map is adjusted for the
* change in character offsets.
*
* @param prefix The prefix that is added before the generated source code.
*/
@Override
public void setWrapperPrefix(String prefix) {
// Determine the current line and character position.
int prefixLine = 0;
int prefixIndex = 0;
for (int i = 0; i < prefix.length(); ++i) {
if (prefix.charAt(i) == '\n') {
prefixLine++;
prefixIndex = 0;
} else {
prefixIndex++;
}
}
prefixPosition = new FilePosition(prefixLine, prefixIndex);
}
/**
* Sets the source code that exists in the buffer for which the
* generated code is being generated. This ensures that the source map
* accurately reflects the fact that the source is being appended to
* an existing buffer and as such, does not start at line 0, position 0
* but rather some other line and position.
*
* @param offsetLine The index of the current line being printed.
* @param offsetIndex The column index of the current character being printed.
*/
@Override
public void setStartingPosition(int offsetLine, int offsetIndex) {
checkState(offsetLine >= 0);
checkState(offsetIndex >= 0);
offsetPosition = new FilePosition(offsetLine, offsetIndex);
}
/**
* Adds a mapping for the given node. Mappings must be added in order.
* @param startPosition The position on the starting line
* @param endPosition The position on the ending line.
*/
@Override
public void addMapping(
String sourceName, @Nullable String symbolName,
FilePosition sourceStartPosition,
FilePosition startPosition, FilePosition endPosition) {
// Don't bother if there is not sufficient information to be useful.
if (sourceName == null || sourceStartPosition.getLine() < 0) {
return;
}
FilePosition adjustedStart = startPosition;
FilePosition adjustedEnd = endPosition;
if (offsetPosition.getLine() != 0
|| offsetPosition.getColumn() != 0) {
// If the mapping is found on the first line, we need to offset
// its character position by the number of characters found on
// the *last* line of the source file to which the code is
// being generated.
int offsetLine = offsetPosition.getLine();
int startOffsetPosition = offsetPosition.getColumn();
int endOffsetPosition = offsetPosition.getColumn();
if (startPosition.getLine() > 0) {
startOffsetPosition = 0;
}
if (endPosition.getLine() > 0) {
endOffsetPosition = 0;
}
adjustedStart = new FilePosition(
startPosition.getLine() + offsetLine,
startPosition.getColumn() + startOffsetPosition);
adjustedEnd = new FilePosition(
endPosition.getLine() + offsetLine,
endPosition.getColumn() + endOffsetPosition);
}
// Create the new mapping.
Mapping mapping = new Mapping();
mapping.sourceFile = sourceName;
mapping.originalPosition = sourceStartPosition;
mapping.originalName = symbolName;
mapping.startPosition = adjustedStart;
mapping.endPosition = adjustedEnd;
// Validate the mappings are in a proper order.
if (lastMapping != null) {
int lastLine = lastMapping.startPosition.getLine();
int lastColumn = lastMapping.startPosition.getColumn();
int nextLine = mapping.startPosition.getLine();
int nextColumn = mapping.startPosition.getColumn();
Preconditions.checkState(nextLine > lastLine
|| (nextLine == lastLine && nextColumn >= lastColumn),
"Incorrect source mappings order, previous : (%s,%s)\n"
+ "new : (%s,%s)",
lastLine, lastColumn, nextLine, nextColumn);
}
lastMapping = mapping;
mappings.add(mapping);
}
@Override public void addSourcesContent(String source, String content) {
sourceFileContentMap.put(source, content);
}
class ConsumerEntryVisitor implements EntryVisitor {
@Override
public void visit(
String sourceName, String symbolName,
FilePosition sourceStartPosition,
FilePosition startPosition, FilePosition endPosition) {
addMapping(sourceName, symbolName,
sourceStartPosition, startPosition, endPosition);
}
}
/**
* Merges current mapping with {@code mapSectionContents} considering the
* offset {@code (line, column)}. Any extension in the map section will be
* ignored.
*
* @param line The line offset
* @param column The column offset
* @param mapSectionContents The map section to be appended
* @throws SourceMapParseException
*/
public void mergeMapSection(int line, int column, String mapSectionContents)
throws SourceMapParseException {
setStartingPosition(line, column);
SourceMapConsumerV3 section = new SourceMapConsumerV3();
section.parse(mapSectionContents);
section.visitMappings(new ConsumerEntryVisitor());
}
/**
* Works like {@link #mergeMapSection(int, int, String)}, except that
* extensions from the @{code mapSectionContents} are merged to the top level
* source map. For conflicts a {@code mergeAction} is performed.
*
* @param line The line offset
* @param column The column offset
* @param mapSectionContents The map section to be appended
* @param mergeAction The merge action for conflicting extensions
* @throws SourceMapParseException
*/
public void mergeMapSection(int line, int column, String mapSectionContents,
ExtensionMergeAction mergeAction)
throws SourceMapParseException {
setStartingPosition(line, column);
SourceMapConsumerV3 section = new SourceMapConsumerV3();
section.parse(mapSectionContents);
section.visitMappings(new ConsumerEntryVisitor());
for (Entry entry : section.getExtensions().entrySet()) {
String extensionKey = entry.getKey();
if (extensions.containsKey(extensionKey)) {
extensions.put(extensionKey,
mergeAction.merge(extensionKey,
extensions.get(extensionKey),
entry.getValue()));
} else {
extensions.put(extensionKey, entry.getValue());
}
}
}
/**
* Writes out the source map in the following format (line numbers are for reference only and are
* not part of the format):
*
*
Line 1 : The entire file is a single JSON object
*
Line 2 : File version (always the first entry in the object)
*
Line 3 : [Optional] The name of the file that this source map is associated with.
*
Line 4 : [Optional] The number of lines represented in the source map.
*
Line 5 : [Optional] An optional source root, useful for relocating source files on a
* server or removing repeated prefix values in the "sources" entry.
*
Line 6 : A list of sources used by the "mappings" entry relative to the sourceRoot.
*
Line 7 : An optional list of the full content of the source files.
*
Line 8 : A list of symbol names used by the "mapping" entry. This list may be incomplete.
* Line 9 : The mappings field.
*
Line 10: Any custom field (extension).
*
*/
@Override
public void appendTo(Appendable out, @Nullable String name) throws IOException {
int maxLine = prepMappings() + 1;
// Add the header fields.
out.append("{\n");
appendFirstField(out, "version", "3");
if (name != null) {
appendField(out, "file", escapeString(name));
}
appendField(out, "lineCount", String.valueOf(maxLine));
//optional source root
if (this.sourceRootPath != null && !this.sourceRootPath.isEmpty()) {
appendField(out, "sourceRoot", escapeString(this.sourceRootPath));
}
// Add the mappings themselves.
appendFieldStart(out, "mappings");
// out.append("[");
(new LineMapper(out, maxLine)).appendLineMappings();
// out.append("]");
appendFieldEnd(out);
// Files names
appendFieldStart(out, "sources");
out.append("[");
addSourceNameMap(out);
out.append("]");
appendFieldEnd(out);
// Sources contents
addSourcesContentMap(out);
// Identifier names
appendFieldStart(out, "names");
out.append("[");
addSymbolNameMap(out);
out.append("]");
appendFieldEnd(out);
// Extensions, only if there is any
for (String key : this.extensions.keySet()) {
Object objValue = this.extensions.get(key);
String value;
if (objValue instanceof String) {
value = escapeString((String) objValue); // escapes native String
} else {
value = objValue.toString();
}
appendField(out, key, value);
}
out.append("\n}\n");
}
/**
* A prefix to be added to the beginning of each sourceName passed to
* {@link #addMapping}. Debuggers expect (prefix + sourceName) to be a URL
* for loading the source code.
*
* @param path The URL prefix to save in the sourcemap file. (Not validated.)
*/
public void setSourceRoot(String path){
this.sourceRootPath = path;
}
/**
* Adds field extensions to the json source map. The value is allowed to be
* any value accepted by json, eg. string, JsonObject, JsonArray, etc.
*
* Extensions must follow the format x_orgranization_field (based on V3
* proposal), otherwise a {@code SourceMapParseExtension} will be thrown.
*
* @param name The name of the extension with format organization_field
* @param object The value of the extension as a valid json value
* @throws SourceMapParseException if extension name is malformed
*/
public void addExtension(String name, Object object)
throws SourceMapParseException{
if (!name.startsWith("x_")){
throw new SourceMapParseException("Extension '" + name +
"' must start with 'x_'");
}
this.extensions.put(name, object);
}
/**
* Removes an extension by name if present.
*
* @param name The name of the extension with format organization_field
*/
public void removeExtension(String name) {
if (this.extensions.containsKey(name)) {
this.extensions.remove(name);
}
}
/**
* Check whether or not the sourcemap has an extension.
*
* @param name The name of the extension with format organization_field
* @return If the extension exist
*/
public boolean hasExtension(String name) {
return this.extensions.containsKey(name);
}
/**
* Returns the value mapped by the specified extension
* or {@code null} if this extension does not exist.
*
* @param name
* @return the extension value or {@code null}
*/
public Object getExtension(String name) {
return this.extensions.get(name);
}
/**
* Writes the source name map to 'out'.
*/
private void addSourceNameMap(Appendable out) throws IOException {
addNameMap(out, sourceFileMap);
}
private void addSourcesContentMap(Appendable out) throws IOException {
boolean found = false;
int size = sourceFileMap.size();
List contents = new ArrayList<>(size);
contents.addAll(Collections.nCopies(size, ""));
for (Map.Entry entry : sourceFileContentMap.entrySet()) {
Integer index = sourceFileMap.get(entry.getKey());
if (index != null && index < size) {
contents.set(index, entry.getValue());
found = true;
}
}
if (!found) {
return;
}
appendFieldStart(out, "sourcesContent");
out.append("[");
for (int i = 0; i < size; i++) {
if (i != 0) {
out.append(",");
}
String sourceContent = contents.get(i);
out.append(escapeString(nullToEmpty(sourceContent)));
}
out.append("]");
appendFieldEnd(out);
}
/**
* Writes the source name map to 'out'.
*/
private void addSymbolNameMap(Appendable out) throws IOException {
addNameMap(out, originalNameMap);
}
private static void addNameMap(Appendable out, Map map)
throws IOException {
int i = 0;
for (Entry entry : map.entrySet()) {
String key = entry.getKey();
if (i != 0) {
out.append(",");
}
out.append(escapeString(key));
i++;
}
}
/**
* Escapes the given string for JSON.
*/
private static String escapeString(String value) {
return Util.escapeString(value);
}
// Source map field helpers.
private static void appendFirstField(
Appendable out, String name, CharSequence value)
throws IOException {
appendFieldStart(out, name, true);
out.append(value);
}
private static void appendField(
Appendable out, String name, CharSequence value)
throws IOException {
appendFieldStart(out, name, false);
out.append(value);
}
private static void appendFieldStart(Appendable out, String name)
throws IOException {
appendFieldStart(out, name, false);
}
private static void appendFieldStart(Appendable out, String name, boolean first)
throws IOException {
if (!first) {
out.append(",\n");
}
out.append("\"");
out.append(name);
out.append("\"");
out.append(":");
}
@SuppressWarnings("unused")
private static void appendFieldEnd(Appendable out)
throws IOException {
}
/**
* Assigns sequential ids to used mappings, and returns the last line mapped.
*/
private int prepMappings() throws IOException {
// Mark any unused mappings.
(new MappingTraversal()).traverse(new UsedMappingCheck());
// Renumber used mappings and keep track of the last line.
int id = 0;
int maxLine = 0;
for (Mapping m : mappings) {
if (m.used) {
m.id = id++;
int endPositionLine = m.endPosition.getLine();
maxLine = Math.max(maxLine, endPositionLine);
}
}
// Adjust for the prefix.
return maxLine + prefixPosition.getLine();
}
/**
* A mapping from a given position in an input source file to a given position
* in the generated code.
*/
static class Mapping {
/**
* A unique ID for this mapping for record keeping purposes.
*/
int id = UNMAPPED;
/**
* The source file index.
*/
String sourceFile;
/**
* The position of the code in the input source file. Both
* the line number and the character index are indexed by
* 1 for legacy reasons via the Rhino Node class.
*/
FilePosition originalPosition;
/**
* The starting position of the code in the generated source
* file which this mapping represents. Indexed by 0.
*/
FilePosition startPosition;
/**
* The ending position of the code in the generated source
* file which this mapping represents. Indexed by 0.
*/
FilePosition endPosition;
/**
* The original name of the token found at the position
* represented by this mapping (if any).
*/
String originalName;
/**
* Whether the mapping is actually used by the source map.
*/
boolean used = false;
}
/**
* Mark any visited mapping as "used".
*/
private static class UsedMappingCheck implements MappingVisitor {
/**
* @throws IOException
*/
@Override
public void visit(Mapping m, int line, int col, int nextLine, int nextCol)
throws IOException {
if (m != null) {
m.used = true;
}
}
}
private interface MappingVisitor {
/**
* @param m The mapping for the current code segment. null if the segment
* is unmapped.
* @param line The starting line for this code segment.
* @param col The starting column for this code segment.
* @param endLine The ending line
* @param endCol The ending column
* @throws IOException
*/
void visit(Mapping m, int line, int col, int endLine, int endCol)
throws IOException;
}
/**
* Walk the mappings and visit each segment of the mappings, unmapped
* segments are visited with a null mapping, unused mapping are not visited.
*/
private class MappingTraversal {
// The last line and column written
private int line;
private int col;
MappingTraversal() {
}
// Append the line mapping entries.
void traverse(MappingVisitor v) throws IOException {
// The mapping list is ordered as a pre-order traversal. The mapping
// positions give us enough information to rebuild the stack and this
// allows the building of the source map in O(n) time.
Deque stack = new ArrayDeque<>();
for (Mapping m : mappings) {
// Find the closest ancestor of the current mapping:
// An overlapping mapping is an ancestor of the current mapping, any
// non-overlapping mappings are siblings (or cousins) and must be
// closed in the reverse order of when they encountered.
while (!stack.isEmpty() && !isOverlapped(stack.peek(), m)) {
Mapping previous = stack.pop();
maybeVisit(v, previous);
}
// Any gaps between the current line position and the start of the
// current mapping belong to the parent.
Mapping parent = stack.peek();
maybeVisitParent(v, parent, m);
stack.push(m);
}
// There are no more children to be had, simply close the remaining
// mappings in the reverse order of when they encountered.
while (!stack.isEmpty()) {
Mapping m = stack.pop();
maybeVisit(v, m);
}
}
/**
* @return The line adjusted for the prefix position.
*/
private int getAdjustedLine(FilePosition p) {
return p.getLine() + prefixPosition.getLine();
}
/**
* @return The column adjusted for the prefix position.
*/
private int getAdjustedCol(FilePosition p) {
int rawLine = p.getLine();
int rawCol = p.getColumn();
// Only the first line needs the character position adjusted.
return (rawLine != 0)
? rawCol : rawCol + prefixPosition.getColumn();
}
/**
* @return Whether m1 ends before m2 starts.
*/
private boolean isOverlapped(Mapping m1, Mapping m2) {
// No need to use adjusted values here, relative positions are sufficient.
int l1 = m1.endPosition.getLine();
int l2 = m2.startPosition.getLine();
int c1 = m1.endPosition.getColumn();
int c2 = m2.startPosition.getColumn();
return (l1 == l2 && c1 >= c2) || l1 > l2;
}
/**
* Write any needed entries from the current position to the end of the
* provided mapping.
*/
private void maybeVisit(MappingVisitor v, Mapping m) throws IOException {
int nextLine = getAdjustedLine(m.endPosition);
int nextCol = getAdjustedCol(m.endPosition);
// If this anything remaining in this mapping beyond the
// current line and column position, write it out now.
if (line < nextLine || (line == nextLine && col < nextCol)) {
visit(v, m, nextLine, nextCol);
}
}
/**
* Write any needed entries to complete the provided mapping.
*/
private void maybeVisitParent(MappingVisitor v, Mapping parent, Mapping m)
throws IOException {
int nextLine = getAdjustedLine(m.startPosition);
int nextCol = getAdjustedCol(m.startPosition);
// If the previous value is null, no mapping exists.
checkState(line < nextLine || col <= nextCol);
if (line < nextLine || (line == nextLine && col < nextCol)) {
visit(v, parent, nextLine, nextCol);
}
}
/**
* Write any entries needed between the current position the next position
* and update the current position.
*/
private void visit(MappingVisitor v, Mapping m,
int nextLine, int nextCol)
throws IOException {
checkState(line <= nextLine);
checkState(line < nextLine || col < nextCol);
if (line == nextLine && col == nextCol) {
// Nothing to do.
throw new IllegalStateException();
}
v.visit(m, line, col, nextLine, nextCol);
line = nextLine;
col = nextCol;
}
}
/**
* Appends the index source map to the given buffer.
*
* @param out The stream to which the map will be appended.
* @param name The name of the generated source file that this source map
* represents.
* @param sections An ordered list of map sections to include in the index.
* @throws IOException
*/
@Override
public void appendIndexMapTo(
Appendable out, String name, List sections)
throws IOException {
// Add the header fields.
out.append("{\n");
appendFirstField(out, "version", "3");
appendField(out, "file", escapeString(name));
// Add the line character maps.
appendFieldStart(out, "sections");
out.append("[\n");
boolean first = true;
for (SourceMapSection section : sections) {
if (first) {
first = false;
} else {
out.append(",\n");
}
out.append("{\n");
appendFieldStart(out, "offset", true);
appendOffsetValue(out, section.getLine(), section.getColumn());
if (section.getSectionType() == SourceMapSection.SectionType.URL) {
appendField(out, "url", escapeString(section.getSectionValue()));
} else if (section.getSectionType() == SourceMapSection.SectionType.MAP) {
appendField(out, "map", section.getSectionValue());
} else {
throw new IOException("Unexpected section type");
}
out.append("\n}");
}
out.append("\n]");
appendFieldEnd(out);
out.append("\n}\n");
}
private static void appendOffsetValue(Appendable out, int line, int column) throws IOException {
out.append("{\n");
appendFirstField(out, "line", String.valueOf(line));
appendField(out, "column", String.valueOf(column));
out.append("\n}");
}
private int getSourceId(String sourceName) {
if (!Objects.equals(sourceName, lastSourceFile)) {
lastSourceFile = sourceName;
Integer index = sourceFileMap.get(sourceName);
if (index != null) {
lastSourceFileIndex = index;
} else {
lastSourceFileIndex = sourceFileMap.size();
sourceFileMap.put(sourceName, lastSourceFileIndex);
}
}
return lastSourceFileIndex;
}
private int getNameId(String symbolName) {
int originalNameIndex;
Integer index = originalNameMap.get(symbolName);
if (index != null) {
originalNameIndex = index;
} else {
originalNameIndex = originalNameMap.size();
originalNameMap.put(symbolName, originalNameIndex);
}
return originalNameIndex;
}
private class LineMapper implements MappingVisitor {
// The destination.
private final Appendable out;
private final int maxLine; // TODO(johnlenz): This shouldn't be necessary to track.
private int previousLine = -1;
private int previousColumn = 0;
// Previous values used for storing relative ids.
private int previousSourceFileId;
private int previousSourceLine;
private int previousSourceColumn;
private int previousNameId;
LineMapper(Appendable out, int maxLine) {
this.out = out;
this.maxLine = maxLine;
}
/**
* As each segment is visited write out the appropriate line mapping.
*/
@Override
public void visit(Mapping m, int line, int col, int nextLine, int nextCol)
throws IOException {
if (previousLine != line) {
previousColumn = 0;
}
if (line != nextLine || col != nextCol) {
// TODO(johnlenz): For some reason, we have mappings beyond the max line.
// So far they're just null mappings and we can ignore them.
// (If they're non-null, we assert-fail.)
if (line < maxLine) {
if (previousLine == line) { // not the first entry for the line
out.append(',');
}
writeEntry(m, col);
previousLine = line;
previousColumn = col;
} else {
checkState(m == null);
}
}
for (int i = line; i <= nextLine && i < maxLine; i++) {
if (i == nextLine) {
break;
}
closeLine(false);
openLine(false);
}
}
/**
* Writes an entry for the given column (of the generated text) and
* associated mapping.
* The values are stored as relative to the last seen values for each
* field and encoded as Base64VLQs.
*/
void writeEntry(Mapping m, int column) throws IOException {
// The relative generated column number
Base64VLQ.encode(out, column - previousColumn);
previousColumn = column;
if (m != null) {
// The relative source file id
int sourceId = getSourceId(m.sourceFile);
Base64VLQ.encode(out, sourceId - previousSourceFileId);
previousSourceFileId = sourceId;
// The relative source file line and column
int srcline = m.originalPosition.getLine();
int srcColumn = m.originalPosition.getColumn();
Base64VLQ.encode(out, srcline - previousSourceLine);
previousSourceLine = srcline;
Base64VLQ.encode(out, srcColumn - previousSourceColumn);
previousSourceColumn = srcColumn;
if (m.originalName != null) {
// The relative id for the associated symbol name
int nameId = getNameId(m.originalName);
Base64VLQ.encode(out, (nameId - previousNameId));
previousNameId = nameId;
}
}
}
// Append the line mapping entries.
void appendLineMappings() throws IOException {
// Start the first line.
openLine(true);
(new MappingTraversal()).traverse(this);
// And close the final line.
closeLine(true);
}
/**
* Begin the entry for a new line.
*/
private void openLine(boolean firstEntry) throws IOException {
if (firstEntry) {
out.append('\"');
}
}
/**
* End the entry for a line.
*/
private void closeLine(boolean finalEntry) throws IOException {
out.append(';');
if (finalEntry) {
out.append('\"');
}
}
}
}
