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org.yaml.snakeyaml.emitter.Emitter Maven / Gradle / Ivy
/**
* Copyright (c) 2008, http://www.snakeyaml.org
*
* 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 org.yaml.snakeyaml.emitter;
import java.io.IOException;
import java.io.Writer;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Queue;
import java.util.Set;
import java.util.TreeSet;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.regex.Pattern;
import org.yaml.snakeyaml.DumperOptions;
import org.yaml.snakeyaml.DumperOptions.Version;
import org.yaml.snakeyaml.error.YAMLException;
import org.yaml.snakeyaml.events.AliasEvent;
import org.yaml.snakeyaml.events.CollectionEndEvent;
import org.yaml.snakeyaml.events.CollectionStartEvent;
import org.yaml.snakeyaml.events.DocumentEndEvent;
import org.yaml.snakeyaml.events.DocumentStartEvent;
import org.yaml.snakeyaml.events.Event;
import org.yaml.snakeyaml.events.MappingEndEvent;
import org.yaml.snakeyaml.events.MappingStartEvent;
import org.yaml.snakeyaml.events.NodeEvent;
import org.yaml.snakeyaml.events.ScalarEvent;
import org.yaml.snakeyaml.events.SequenceEndEvent;
import org.yaml.snakeyaml.events.SequenceStartEvent;
import org.yaml.snakeyaml.events.StreamEndEvent;
import org.yaml.snakeyaml.events.StreamStartEvent;
import org.yaml.snakeyaml.nodes.Tag;
import org.yaml.snakeyaml.reader.StreamReader;
import org.yaml.snakeyaml.scanner.Constant;
import org.yaml.snakeyaml.util.ArrayStack;
/**
*
* Emitter expects events obeying the following grammar:
* stream ::= STREAM-START document* STREAM-END
* document ::= DOCUMENT-START node DOCUMENT-END
* node ::= SCALAR | sequence | mapping
* sequence ::= SEQUENCE-START node* SEQUENCE-END
* mapping ::= MAPPING-START (node node)* MAPPING-END
*
*/
public final class Emitter implements Emitable {
private static final Map ESCAPE_REPLACEMENTS = new HashMap();
public static final int MIN_INDENT = 1;
public static final int MAX_INDENT = 10;
private static final char[] SPACE = { ' ' };
static {
ESCAPE_REPLACEMENTS.put('\0', "0");
ESCAPE_REPLACEMENTS.put('\u0007', "a");
ESCAPE_REPLACEMENTS.put('\u0008', "b");
ESCAPE_REPLACEMENTS.put('\u0009', "t");
ESCAPE_REPLACEMENTS.put('\n', "n");
ESCAPE_REPLACEMENTS.put('\u000B', "v");
ESCAPE_REPLACEMENTS.put('\u000C', "f");
ESCAPE_REPLACEMENTS.put('\r', "r");
ESCAPE_REPLACEMENTS.put('\u001B', "e");
ESCAPE_REPLACEMENTS.put('"', "\"");
ESCAPE_REPLACEMENTS.put('\\', "\\");
ESCAPE_REPLACEMENTS.put('\u0085', "N");
ESCAPE_REPLACEMENTS.put('\u00A0', "_");
ESCAPE_REPLACEMENTS.put('\u2028', "L");
ESCAPE_REPLACEMENTS.put('\u2029', "P");
}
private final static Map DEFAULT_TAG_PREFIXES = new LinkedHashMap();
static {
DEFAULT_TAG_PREFIXES.put("!", "!");
DEFAULT_TAG_PREFIXES.put(Tag.PREFIX, "!!");
}
// The stream should have the methods `write` and possibly `flush`.
private final Writer stream;
// Encoding is defined by Writer (cannot be overriden by STREAM-START.)
// private Charset encoding;
// Emitter is a state machine with a stack of states to handle nested
// structures.
private final ArrayStack states;
private EmitterState state;
// Current event and the event queue.
private final Queue events;
private Event event;
// The current indentation level and the stack of previous indents.
private final ArrayStack indents;
private Integer indent;
// Flow level.
private int flowLevel;
// Contexts.
private boolean rootContext;
private boolean mappingContext;
private boolean simpleKeyContext;
//
// Characteristics of the last emitted character:
// - current position.
// - is it a whitespace?
// - is it an indention character
// (indentation space, '-', '?', or ':')?
// private int line; this variable is not used
private int column;
private boolean whitespace;
private boolean indention;
private boolean openEnded;
// Formatting details.
private Boolean canonical;
// pretty print flow by adding extra line breaks
private Boolean prettyFlow;
private boolean allowUnicode;
private int bestIndent;
private int indicatorIndent;
private int bestWidth;
private char[] bestLineBreak;
private boolean splitLines;
private int maxSimpleKeyLength;
// Tag prefixes.
private Map tagPrefixes;
// Prepared anchor and tag.
private String preparedAnchor;
private String preparedTag;
// Scalar analysis and style.
private ScalarAnalysis analysis;
private DumperOptions.ScalarStyle style;
public Emitter(Writer stream, DumperOptions opts) {
// The stream should have the methods `write` and possibly `flush`.
this.stream = stream;
// Emitter is a state machine with a stack of states to handle nested
// structures.
this.states = new ArrayStack(100);
this.state = new ExpectStreamStart();
// Current event and the event queue.
this.events = new ArrayBlockingQueue(100);
this.event = null;
// The current indentation level and the stack of previous indents.
this.indents = new ArrayStack(10);
this.indent = null;
// Flow level.
this.flowLevel = 0;
// Contexts.
mappingContext = false;
simpleKeyContext = false;
//
// Characteristics of the last emitted character:
// - current position.
// - is it a whitespace?
// - is it an indention character
// (indentation space, '-', '?', or ':')?
column = 0;
whitespace = true;
indention = true;
// Whether the document requires an explicit document indicator
openEnded = false;
// Formatting details.
this.canonical = opts.isCanonical();
this.prettyFlow = opts.isPrettyFlow();
this.allowUnicode = opts.isAllowUnicode();
this.bestIndent = 2;
if ((opts.getIndent() > MIN_INDENT) && (opts.getIndent() < MAX_INDENT)) {
this.bestIndent = opts.getIndent();
}
this.indicatorIndent = opts.getIndicatorIndent();
this.bestWidth = 80;
if (opts.getWidth() > this.bestIndent * 2) {
this.bestWidth = opts.getWidth();
}
this.bestLineBreak = opts.getLineBreak().getString().toCharArray();
this.splitLines = opts.getSplitLines();
this.maxSimpleKeyLength = opts.getMaxSimpleKeyLength();
// Tag prefixes.
this.tagPrefixes = new LinkedHashMap();
// Prepared anchor and tag.
this.preparedAnchor = null;
this.preparedTag = null;
// Scalar analysis and style.
this.analysis = null;
this.style = null;
}
public void emit(Event event) throws IOException {
this.events.add(event);
while (!needMoreEvents()) {
this.event = this.events.poll();
this.state.expect();
this.event = null;
}
}
// In some cases, we wait for a few next events before emitting.
private boolean needMoreEvents() {
if (events.isEmpty()) {
return true;
}
Event event = events.peek();
if (event instanceof DocumentStartEvent) {
return needEvents(1);
} else if (event instanceof SequenceStartEvent) {
return needEvents(2);
} else if (event instanceof MappingStartEvent) {
return needEvents(3);
} else {
return false;
}
}
private boolean needEvents(int count) {
int level = 0;
Iterator iter = events.iterator();
iter.next();
while (iter.hasNext()) {
Event event = iter.next();
if (event instanceof DocumentStartEvent || event instanceof CollectionStartEvent) {
level++;
} else if (event instanceof DocumentEndEvent || event instanceof CollectionEndEvent) {
level--;
} else if (event instanceof StreamEndEvent) {
level = -1;
}
if (level < 0) {
return false;
}
}
return events.size() < count + 1;
}
private void increaseIndent(boolean flow, boolean indentless) {
indents.push(indent);
if (indent == null) {
if (flow) {
indent = bestIndent;
} else {
indent = 0;
}
} else if (!indentless) {
this.indent += bestIndent;
}
}
// States
// Stream handlers.
private class ExpectStreamStart implements EmitterState {
public void expect() throws IOException {
if (event instanceof StreamStartEvent) {
writeStreamStart();
state = new ExpectFirstDocumentStart();
} else {
throw new EmitterException("expected StreamStartEvent, but got " + event);
}
}
}
private class ExpectNothing implements EmitterState {
public void expect() throws IOException {
throw new EmitterException("expecting nothing, but got " + event);
}
}
// Document handlers.
private class ExpectFirstDocumentStart implements EmitterState {
public void expect() throws IOException {
new ExpectDocumentStart(true).expect();
}
}
private class ExpectDocumentStart implements EmitterState {
private boolean first;
public ExpectDocumentStart(boolean first) {
this.first = first;
}
public void expect() throws IOException {
if (event instanceof DocumentStartEvent) {
DocumentStartEvent ev = (DocumentStartEvent) event;
if ((ev.getVersion() != null || ev.getTags() != null) && openEnded) {
writeIndicator("...", true, false, false);
writeIndent();
}
if (ev.getVersion() != null) {
String versionText = prepareVersion(ev.getVersion());
writeVersionDirective(versionText);
}
tagPrefixes = new LinkedHashMap(DEFAULT_TAG_PREFIXES);
if (ev.getTags() != null) {
Set handles = new TreeSet(ev.getTags().keySet());
for (String handle : handles) {
String prefix = ev.getTags().get(handle);
tagPrefixes.put(prefix, handle);
String handleText = prepareTagHandle(handle);
String prefixText = prepareTagPrefix(prefix);
writeTagDirective(handleText, prefixText);
}
}
boolean implicit = first && !ev.getExplicit() && !canonical
&& ev.getVersion() == null
&& (ev.getTags() == null || ev.getTags().isEmpty())
&& !checkEmptyDocument();
if (!implicit) {
writeIndent();
writeIndicator("---", true, false, false);
if (canonical) {
writeIndent();
}
}
state = new ExpectDocumentRoot();
} else if (event instanceof StreamEndEvent) {
// TODO fix 313 PyYAML changeset
// if (openEnded) {
// writeIndicator("...", true, false, false);
// writeIndent();
// }
writeStreamEnd();
state = new ExpectNothing();
} else {
throw new EmitterException("expected DocumentStartEvent, but got " + event);
}
}
}
private class ExpectDocumentEnd implements EmitterState {
public void expect() throws IOException {
if (event instanceof DocumentEndEvent) {
writeIndent();
if (((DocumentEndEvent) event).getExplicit()) {
writeIndicator("...", true, false, false);
writeIndent();
}
flushStream();
state = new ExpectDocumentStart(false);
} else {
throw new EmitterException("expected DocumentEndEvent, but got " + event);
}
}
}
private class ExpectDocumentRoot implements EmitterState {
public void expect() throws IOException {
states.push(new ExpectDocumentEnd());
expectNode(true, false, false);
}
}
// Node handlers.
private void expectNode(boolean root, boolean mapping, boolean simpleKey) throws IOException {
rootContext = root;
mappingContext = mapping;
simpleKeyContext = simpleKey;
if (event instanceof AliasEvent) {
expectAlias();
} else if (event instanceof ScalarEvent || event instanceof CollectionStartEvent) {
processAnchor("&");
processTag();
if (event instanceof ScalarEvent) {
expectScalar();
} else if (event instanceof SequenceStartEvent) {
if (flowLevel != 0 || canonical || ((SequenceStartEvent) event).isFlow()
|| checkEmptySequence()) {
expectFlowSequence();
} else {
expectBlockSequence();
}
} else {// MappingStartEvent
if (flowLevel != 0 || canonical || ((MappingStartEvent) event).isFlow()
|| checkEmptyMapping()) {
expectFlowMapping();
} else {
expectBlockMapping();
}
}
} else {
throw new EmitterException("expected NodeEvent, but got " + event);
}
}
private void expectAlias() throws IOException {
if (!(event instanceof AliasEvent)) {
throw new EmitterException("Alias must be provided");
}
processAnchor("*");
state = states.pop();
}
private void expectScalar() throws IOException {
increaseIndent(true, false);
processScalar();
indent = indents.pop();
state = states.pop();
}
// Flow sequence handlers.
private void expectFlowSequence() throws IOException {
writeIndicator("[", true, true, false);
flowLevel++;
increaseIndent(true, false);
if (prettyFlow) {
writeIndent();
}
state = new ExpectFirstFlowSequenceItem();
}
private class ExpectFirstFlowSequenceItem implements EmitterState {
public void expect() throws IOException {
if (event instanceof SequenceEndEvent) {
indent = indents.pop();
flowLevel--;
writeIndicator("]", false, false, false);
state = states.pop();
} else {
if (canonical || (column > bestWidth && splitLines) || prettyFlow) {
writeIndent();
}
states.push(new ExpectFlowSequenceItem());
expectNode(false, false, false);
}
}
}
private class ExpectFlowSequenceItem implements EmitterState {
public void expect() throws IOException {
if (event instanceof SequenceEndEvent) {
indent = indents.pop();
flowLevel--;
if (canonical) {
writeIndicator(",", false, false, false);
writeIndent();
}
writeIndicator("]", false, false, false);
if (prettyFlow) {
writeIndent();
}
state = states.pop();
} else {
writeIndicator(",", false, false, false);
if (canonical || (column > bestWidth && splitLines) || prettyFlow) {
writeIndent();
}
states.push(new ExpectFlowSequenceItem());
expectNode(false, false, false);
}
}
}
// Flow mapping handlers.
private void expectFlowMapping() throws IOException {
writeIndicator("{", true, true, false);
flowLevel++;
increaseIndent(true, false);
if (prettyFlow) {
writeIndent();
}
state = new ExpectFirstFlowMappingKey();
}
private class ExpectFirstFlowMappingKey implements EmitterState {
public void expect() throws IOException {
if (event instanceof MappingEndEvent) {
indent = indents.pop();
flowLevel--;
writeIndicator("}", false, false, false);
state = states.pop();
} else {
if (canonical || (column > bestWidth && splitLines) || prettyFlow) {
writeIndent();
}
if (!canonical && checkSimpleKey()) {
states.push(new ExpectFlowMappingSimpleValue());
expectNode(false, true, true);
} else {
writeIndicator("?", true, false, false);
states.push(new ExpectFlowMappingValue());
expectNode(false, true, false);
}
}
}
}
private class ExpectFlowMappingKey implements EmitterState {
public void expect() throws IOException {
if (event instanceof MappingEndEvent) {
indent = indents.pop();
flowLevel--;
if (canonical) {
writeIndicator(",", false, false, false);
writeIndent();
}
if (prettyFlow) {
writeIndent();
}
writeIndicator("}", false, false, false);
state = states.pop();
} else {
writeIndicator(",", false, false, false);
if (canonical || (column > bestWidth && splitLines) || prettyFlow) {
writeIndent();
}
if (!canonical && checkSimpleKey()) {
states.push(new ExpectFlowMappingSimpleValue());
expectNode(false, true, true);
} else {
writeIndicator("?", true, false, false);
states.push(new ExpectFlowMappingValue());
expectNode(false, true, false);
}
}
}
}
private class ExpectFlowMappingSimpleValue implements EmitterState {
public void expect() throws IOException {
writeIndicator(":", false, false, false);
states.push(new ExpectFlowMappingKey());
expectNode(false, true, false);
}
}
private class ExpectFlowMappingValue implements EmitterState {
public void expect() throws IOException {
if (canonical || (column > bestWidth) || prettyFlow) {
writeIndent();
}
writeIndicator(":", true, false, false);
states.push(new ExpectFlowMappingKey());
expectNode(false, true, false);
}
}
// Block sequence handlers.
private void expectBlockSequence() throws IOException {
boolean indentless = mappingContext && !indention;
increaseIndent(false, indentless);
state = new ExpectFirstBlockSequenceItem();
}
private class ExpectFirstBlockSequenceItem implements EmitterState {
public void expect() throws IOException {
new ExpectBlockSequenceItem(true).expect();
}
}
private class ExpectBlockSequenceItem implements EmitterState {
private boolean first;
public ExpectBlockSequenceItem(boolean first) {
this.first = first;
}
public void expect() throws IOException {
if (!this.first && event instanceof SequenceEndEvent) {
indent = indents.pop();
state = states.pop();
} else {
writeIndent();
writeWhitespace(indicatorIndent);
writeIndicator("-", true, false, true);
states.push(new ExpectBlockSequenceItem(false));
expectNode(false, false, false);
}
}
}
// Block mapping handlers.
private void expectBlockMapping() throws IOException {
increaseIndent(false, false);
state = new ExpectFirstBlockMappingKey();
}
private class ExpectFirstBlockMappingKey implements EmitterState {
public void expect() throws IOException {
new ExpectBlockMappingKey(true).expect();
}
}
private class ExpectBlockMappingKey implements EmitterState {
private boolean first;
public ExpectBlockMappingKey(boolean first) {
this.first = first;
}
public void expect() throws IOException {
if (!this.first && event instanceof MappingEndEvent) {
indent = indents.pop();
state = states.pop();
} else {
writeIndent();
if (checkSimpleKey()) {
states.push(new ExpectBlockMappingSimpleValue());
expectNode(false, true, true);
} else {
writeIndicator("?", true, false, true);
states.push(new ExpectBlockMappingValue());
expectNode(false, true, false);
}
}
}
}
private class ExpectBlockMappingSimpleValue implements EmitterState {
public void expect() throws IOException {
writeIndicator(":", false, false, false);
states.push(new ExpectBlockMappingKey(false));
expectNode(false, true, false);
}
}
private class ExpectBlockMappingValue implements EmitterState {
public void expect() throws IOException {
writeIndent();
writeIndicator(":", true, false, true);
states.push(new ExpectBlockMappingKey(false));
expectNode(false, true, false);
}
}
// Checkers.
private boolean checkEmptySequence() {
return event instanceof SequenceStartEvent && !events.isEmpty() && events.peek() instanceof SequenceEndEvent;
}
private boolean checkEmptyMapping() {
return event instanceof MappingStartEvent && !events.isEmpty() && events.peek() instanceof MappingEndEvent;
}
private boolean checkEmptyDocument() {
if (!(event instanceof DocumentStartEvent) || events.isEmpty()) {
return false;
}
Event event = events.peek();
if (event instanceof ScalarEvent) {
ScalarEvent e = (ScalarEvent) event;
return e.getAnchor() == null && e.getTag() == null && e.getImplicit() != null && e
.getValue().length() == 0;
}
return false;
}
private boolean checkSimpleKey() {
int length = 0;
if (event instanceof NodeEvent && ((NodeEvent) event).getAnchor() != null) {
if (preparedAnchor == null) {
preparedAnchor = prepareAnchor(((NodeEvent) event).getAnchor());
}
length += preparedAnchor.length();
}
String tag = null;
if (event instanceof ScalarEvent) {
tag = ((ScalarEvent) event).getTag();
} else if (event instanceof CollectionStartEvent) {
tag = ((CollectionStartEvent) event).getTag();
}
if (tag != null) {
if (preparedTag == null) {
preparedTag = prepareTag(tag);
}
length += preparedTag.length();
}
if (event instanceof ScalarEvent) {
if (analysis == null) {
analysis = analyzeScalar(((ScalarEvent) event).getValue());
}
length += analysis.getScalar().length();
}
return length < maxSimpleKeyLength && (event instanceof AliasEvent
|| (event instanceof ScalarEvent && !analysis.isEmpty() && !analysis.isMultiline())
|| checkEmptySequence() || checkEmptyMapping());
}
// Anchor, Tag, and Scalar processors.
private void processAnchor(String indicator) throws IOException {
NodeEvent ev = (NodeEvent) event;
if (ev.getAnchor() == null) {
preparedAnchor = null;
return;
}
if (preparedAnchor == null) {
preparedAnchor = prepareAnchor(ev.getAnchor());
}
writeIndicator(indicator + preparedAnchor, true, false, false);
preparedAnchor = null;
}
private void processTag() throws IOException {
String tag = null;
if (event instanceof ScalarEvent) {
ScalarEvent ev = (ScalarEvent) event;
tag = ev.getTag();
if (style == null) {
style = chooseScalarStyle();
}
if ((!canonical || tag == null) && ((style == null && ev.getImplicit()
.canOmitTagInPlainScalar()) || (style != null && ev.getImplicit()
.canOmitTagInNonPlainScalar()))) {
preparedTag = null;
return;
}
if (ev.getImplicit().canOmitTagInPlainScalar() && tag == null) {
tag = "!";
preparedTag = null;
}
} else {
CollectionStartEvent ev = (CollectionStartEvent) event;
tag = ev.getTag();
if ((!canonical || tag == null) && ev.getImplicit()) {
preparedTag = null;
return;
}
}
if (tag == null) {
throw new EmitterException("tag is not specified");
}
if (preparedTag == null) {
preparedTag = prepareTag(tag);
}
writeIndicator(preparedTag, true, false, false);
preparedTag = null;
}
private DumperOptions.ScalarStyle chooseScalarStyle() {
ScalarEvent ev = (ScalarEvent) event;
if (analysis == null) {
analysis = analyzeScalar(ev.getValue());
}
if (!ev.isPlain() && ev.getScalarStyle() == DumperOptions.ScalarStyle.DOUBLE_QUOTED || this.canonical) {
return DumperOptions.ScalarStyle.DOUBLE_QUOTED;
}
if (ev.isPlain() && ev.getImplicit().canOmitTagInPlainScalar()) {
if (!(simpleKeyContext && (analysis.isEmpty() || analysis.isMultiline()))
&& ((flowLevel != 0 && analysis.isAllowFlowPlain()) || (flowLevel == 0 && analysis.isAllowBlockPlain()))) {
return null;
}
}
if (!ev.isPlain() && (ev.getScalarStyle() == DumperOptions.ScalarStyle.LITERAL || ev.getScalarStyle() == DumperOptions.ScalarStyle.FOLDED)) {
if (flowLevel == 0 && !simpleKeyContext && analysis.isAllowBlock()) {
return ev.getScalarStyle();
}
}
if (ev.isPlain() || ev.getScalarStyle() == DumperOptions.ScalarStyle.SINGLE_QUOTED) {
if (analysis.isAllowSingleQuoted() && !(simpleKeyContext && analysis.isMultiline())) {
return DumperOptions.ScalarStyle.SINGLE_QUOTED;
}
}
return DumperOptions.ScalarStyle.DOUBLE_QUOTED;
}
private void processScalar() throws IOException {
ScalarEvent ev = (ScalarEvent) event;
if (analysis == null) {
analysis = analyzeScalar(ev.getValue());
}
if (style == null) {
style = chooseScalarStyle();
}
boolean split = !simpleKeyContext && splitLines;
if (style == null) {
writePlain(analysis.getScalar(), split);
} else {
switch (style) {
case DOUBLE_QUOTED:
writeDoubleQuoted(analysis.getScalar(), split);
break;
case SINGLE_QUOTED:
writeSingleQuoted(analysis.getScalar(), split);
break;
case FOLDED:
writeFolded(analysis.getScalar(), split);
break;
case LITERAL:
writeLiteral(analysis.getScalar());
break;
default:
throw new YAMLException("Unexpected style: " + style);
}
}
analysis = null;
style = null;
}
// Analyzers.
private String prepareVersion(Version version) {
if (version.major() != 1) {
throw new EmitterException("unsupported YAML version: " + version);
}
return version.getRepresentation();
}
private final static Pattern HANDLE_FORMAT = Pattern.compile("^![-_\\w]*!$");
private String prepareTagHandle(String handle) {
if (handle.length() == 0) {
throw new EmitterException("tag handle must not be empty");
} else if (handle.charAt(0) != '!' || handle.charAt(handle.length() - 1) != '!') {
throw new EmitterException("tag handle must start and end with '!': " + handle);
} else if (!"!".equals(handle) && !HANDLE_FORMAT.matcher(handle).matches()) {
throw new EmitterException("invalid character in the tag handle: " + handle);
}
return handle;
}
private String prepareTagPrefix(String prefix) {
if (prefix.length() == 0) {
throw new EmitterException("tag prefix must not be empty");
}
StringBuilder chunks = new StringBuilder();
int start = 0;
int end = 0;
if (prefix.charAt(0) == '!') {
end = 1;
}
while (end < prefix.length()) {
end++;
}
if (start < end) {
chunks.append(prefix.substring(start, end));
}
return chunks.toString();
}
private String prepareTag(String tag) {
if (tag.length() == 0) {
throw new EmitterException("tag must not be empty");
}
if ("!".equals(tag)) {
return tag;
}
String handle = null;
String suffix = tag;
// shall the tag prefixes be sorted as in PyYAML?
for (String prefix : tagPrefixes.keySet()) {
if (tag.startsWith(prefix) && ("!".equals(prefix) || prefix.length() < tag.length())) {
handle = prefix;
}
}
if (handle != null) {
suffix = tag.substring(handle.length());
handle = tagPrefixes.get(handle);
}
int end = suffix.length();
String suffixText = end > 0 ? suffix.substring(0, end) : "";
if (handle != null) {
return handle + suffixText;
}
return "!<" + suffixText + ">";
}
private final static Pattern ANCHOR_FORMAT = Pattern.compile("^[-_\\w]*$");
static String prepareAnchor(String anchor) {
if (anchor.length() == 0) {
throw new EmitterException("anchor must not be empty");
}
if (!ANCHOR_FORMAT.matcher(anchor).matches()) {
throw new EmitterException("invalid character in the anchor: " + anchor);
}
return anchor;
}
private ScalarAnalysis analyzeScalar(String scalar) {
// Empty scalar is a special case.
if (scalar.length() == 0) {
return new ScalarAnalysis(scalar, true, false, false, true, true, false);
}
// Indicators and special characters.
boolean blockIndicators = false;
boolean flowIndicators = false;
boolean lineBreaks = false;
boolean specialCharacters = false;
// Important whitespace combinations.
boolean leadingSpace = false;
boolean leadingBreak = false;
boolean trailingSpace = false;
boolean trailingBreak = false;
boolean breakSpace = false;
boolean spaceBreak = false;
// Check document indicators.
if (scalar.startsWith("---") || scalar.startsWith("...")) {
blockIndicators = true;
flowIndicators = true;
}
// First character or preceded by a whitespace.
boolean preceededByWhitespace = true;
boolean followedByWhitespace = scalar.length() == 1 || Constant.NULL_BL_T_LINEBR.has(scalar.codePointAt(1));
// The previous character is a space.
boolean previousSpace = false;
// The previous character is a break.
boolean previousBreak = false;
int index = 0;
while (index < scalar.length()) {
int c = scalar.codePointAt(index);
// Check for indicators.
if (index == 0) {
// Leading indicators are special characters.
if ("#,[]{}&*!|>\'\"%@`".indexOf(c) != -1) {
flowIndicators = true;
blockIndicators = true;
}
if (c == '?' || c == ':') {
flowIndicators = true;
if (followedByWhitespace) {
blockIndicators = true;
}
}
if (c == '-' && followedByWhitespace) {
flowIndicators = true;
blockIndicators = true;
}
} else {
// Some indicators cannot appear within a scalar as well.
if (",?[]{}".indexOf(c) != -1) {
flowIndicators = true;
}
if (c == ':') {
flowIndicators = true;
if (followedByWhitespace) {
blockIndicators = true;
}
}
if (c == '#' && preceededByWhitespace) {
flowIndicators = true;
blockIndicators = true;
}
}
// Check for line breaks, special, and unicode characters.
boolean isLineBreak = Constant.LINEBR.has(c);
if (isLineBreak) {
lineBreaks = true;
}
if (!(c == '\n' || (0x20 <= c && c <= 0x7E))) {
if (c == 0x85 || (c >= 0xA0 && c <= 0xD7FF)
|| (c >= 0xE000 && c <= 0xFFFD)
|| (c >= 0x10000 && c <= 0x10FFFF)) {
// unicode is used
if (!this.allowUnicode) {
specialCharacters = true;
}
} else {
specialCharacters = true;
}
}
// Detect important whitespace combinations.
if (c == ' ') {
if (index == 0) {
leadingSpace = true;
}
if (index == scalar.length() - 1) {
trailingSpace = true;
}
if (previousBreak) {
breakSpace = true;
}
previousSpace = true;
previousBreak = false;
} else if (isLineBreak) {
if (index == 0) {
leadingBreak = true;
}
if (index == scalar.length() - 1) {
trailingBreak = true;
}
if (previousSpace) {
spaceBreak = true;
}
previousSpace = false;
previousBreak = true;
} else {
previousSpace = false;
previousBreak = false;
}
// Prepare for the next character.
index += Character.charCount(c);
preceededByWhitespace = Constant.NULL_BL_T.has(c) || isLineBreak;
followedByWhitespace = true;
if (index + 1 < scalar.length()) {
int nextIndex = index + Character.charCount(scalar.codePointAt(index));
if (nextIndex < scalar.length()) {
followedByWhitespace = (Constant.NULL_BL_T.has(scalar.codePointAt(nextIndex))) || isLineBreak;
}
}
}
// Let's decide what styles are allowed.
boolean allowFlowPlain = true;
boolean allowBlockPlain = true;
boolean allowSingleQuoted = true;
boolean allowBlock = true;
// Leading and trailing whitespaces are bad for plain scalars.
if (leadingSpace || leadingBreak || trailingSpace || trailingBreak) {
allowFlowPlain = allowBlockPlain = false;
}
// We do not permit trailing spaces for block scalars.
if (trailingSpace) {
allowBlock = false;
}
// Spaces at the beginning of a new line are only acceptable for block
// scalars.
if (breakSpace) {
allowFlowPlain = allowBlockPlain = allowSingleQuoted = false;
}
// Spaces followed by breaks, as well as special character are only
// allowed for double quoted scalars.
if (spaceBreak || specialCharacters) {
allowFlowPlain = allowBlockPlain = allowSingleQuoted = allowBlock = false;
}
// Although the plain scalar writer supports breaks, we never emit
// multiline plain scalars in the flow context.
if (lineBreaks) {
allowFlowPlain = false;
}
// Flow indicators are forbidden for flow plain scalars.
if (flowIndicators) {
allowFlowPlain = false;
}
// Block indicators are forbidden for block plain scalars.
if (blockIndicators) {
allowBlockPlain = false;
}
return new ScalarAnalysis(scalar, false, lineBreaks, allowFlowPlain, allowBlockPlain,
allowSingleQuoted, allowBlock);
}
// Writers.
void flushStream() throws IOException {
stream.flush();
}
void writeStreamStart() {
// BOM is written by Writer.
}
void writeStreamEnd() throws IOException {
flushStream();
}
void writeIndicator(String indicator, boolean needWhitespace, boolean whitespace,
boolean indentation) throws IOException {
if (!this.whitespace && needWhitespace) {
this.column++;
stream.write(SPACE);
}
this.whitespace = whitespace;
this.indention = this.indention && indentation;
this.column += indicator.length();
openEnded = false;
stream.write(indicator);
}
void writeIndent() throws IOException {
int indent;
if (this.indent != null) {
indent = this.indent;
} else {
indent = 0;
}
if (!this.indention || this.column > indent || (this.column == indent && !this.whitespace)) {
writeLineBreak(null);
}
writeWhitespace(indent - this.column);
}
private void writeWhitespace(int length) throws IOException {
if (length <= 0) {
return;
}
this.whitespace = true;
char[] data = new char[length];
for (int i = 0; i < data.length; i++) {
data[i] = ' ';
}
this.column += length;
stream.write(data);
}
private void writeLineBreak(String data) throws IOException {
this.whitespace = true;
this.indention = true;
this.column = 0;
if (data == null) {
stream.write(this.bestLineBreak);
} else {
stream.write(data);
}
}
void writeVersionDirective(String versionText) throws IOException {
stream.write("%YAML ");
stream.write(versionText);
writeLineBreak(null);
}
void writeTagDirective(String handleText, String prefixText) throws IOException {
// XXX: not sure 4 invocations better then StringBuilders created by str
// + str
stream.write("%TAG ");
stream.write(handleText);
stream.write(SPACE);
stream.write(prefixText);
writeLineBreak(null);
}
// Scalar streams.
private void writeSingleQuoted(String text, boolean split) throws IOException {
writeIndicator("'", true, false, false);
boolean spaces = false;
boolean breaks = false;
int start = 0, end = 0;
char ch;
while (end <= text.length()) {
ch = 0;
if (end < text.length()) {
ch = text.charAt(end);
}
if (spaces) {
if (ch == 0 || ch != ' ') {
if (start + 1 == end && this.column > this.bestWidth && split && start != 0
&& end != text.length()) {
writeIndent();
} else {
int len = end - start;
this.column += len;
stream.write(text, start, len);
}
start = end;
}
} else if (breaks) {
if (ch == 0 || Constant.LINEBR.hasNo(ch)) {
if (text.charAt(start) == '\n') {
writeLineBreak(null);
}
String data = text.substring(start, end);
for (char br : data.toCharArray()) {
if (br == '\n') {
writeLineBreak(null);
} else {
writeLineBreak(String.valueOf(br));
}
}
writeIndent();
start = end;
}
} else {
if (Constant.LINEBR.has(ch, "\0 \'")) {
if (start < end) {
int len = end - start;
this.column += len;
stream.write(text, start, len);
start = end;
}
}
}
if (ch == '\'') {
this.column += 2;
stream.write("''");
start = end + 1;
}
if (ch != 0) {
spaces = ch == ' ';
breaks = Constant.LINEBR.has(ch);
}
end++;
}
writeIndicator("'", false, false, false);
}
private void writeDoubleQuoted(String text, boolean split) throws IOException {
writeIndicator("\"", true, false, false);
int start = 0;
int end = 0;
while (end <= text.length()) {
Character ch = null;
if (end < text.length()) {
ch = text.charAt(end);
}
if (ch == null || "\"\\\u0085\u2028\u2029\uFEFF".indexOf(ch) != -1
|| !('\u0020' <= ch && ch <= '\u007E')) {
if (start < end) {
int len = end - start;
this.column += len;
stream.write(text, start, len);
start = end;
}
if (ch != null) {
String data;
if (ESCAPE_REPLACEMENTS.containsKey(ch)) {
data = "\\" + ESCAPE_REPLACEMENTS.get(ch);
} else if (!this.allowUnicode || !StreamReader.isPrintable(ch)) {
// if !allowUnicode or the character is not printable,
// we must encode it
if (ch <= '\u00FF') {
String s = "0" + Integer.toString(ch, 16);
data = "\\x" + s.substring(s.length() - 2);
} else if (ch >= '\uD800' && ch <= '\uDBFF') {
if (end + 1 < text.length()) {
Character ch2 = text.charAt(++end);
String s = "000" + Long.toHexString(Character.toCodePoint(ch, ch2));
data = "\\U" + s.substring(s.length() - 8);
} else {
String s = "000" + Integer.toString(ch, 16);
data = "\\u" + s.substring(s.length() - 4);
}
} else {
String s = "000" + Integer.toString(ch, 16);
data = "\\u" + s.substring(s.length() - 4);
}
} else {
data = String.valueOf(ch);
}
this.column += data.length();
stream.write(data);
start = end + 1;
}
}
if ((0 < end && end < (text.length() - 1)) && (ch == ' ' || start >= end)
&& (this.column + (end - start)) > this.bestWidth && split) {
String data;
if (start >= end) {
data = "\\";
} else {
data = text.substring(start, end) + "\\";
}
if (start < end) {
start = end;
}
this.column += data.length();
stream.write(data);
writeIndent();
this.whitespace = false;
this.indention = false;
if (text.charAt(start) == ' ') {
data = "\\";
this.column += data.length();
stream.write(data);
}
}
end += 1;
}
writeIndicator("\"", false, false, false);
}
private String determineBlockHints(String text) {
StringBuilder hints = new StringBuilder();
if (Constant.LINEBR.has(text.charAt(0), " ")) {
hints.append(bestIndent);
}
char ch1 = text.charAt(text.length() - 1);
if (Constant.LINEBR.hasNo(ch1)) {
hints.append("-");
} else if (text.length() == 1 || Constant.LINEBR.has(text.charAt(text.length() - 2))) {
hints.append("+");
}
return hints.toString();
}
void writeFolded(String text, boolean split) throws IOException {
String hints = determineBlockHints(text);
writeIndicator(">" + hints, true, false, false);
if (hints.length() > 0 && (hints.charAt(hints.length() - 1) == '+')) {
openEnded = true;
}
writeLineBreak(null);
boolean leadingSpace = true;
boolean spaces = false;
boolean breaks = true;
int start = 0, end = 0;
while (end <= text.length()) {
char ch = 0;
if (end < text.length()) {
ch = text.charAt(end);
}
if (breaks) {
if (ch == 0 || Constant.LINEBR.hasNo(ch)) {
if (!leadingSpace && ch != 0 && ch != ' ' && text.charAt(start) == '\n') {
writeLineBreak(null);
}
leadingSpace = ch == ' ';
String data = text.substring(start, end);
for (char br : data.toCharArray()) {
if (br == '\n') {
writeLineBreak(null);
} else {
writeLineBreak(String.valueOf(br));
}
}
if (ch != 0) {
writeIndent();
}
start = end;
}
} else if (spaces) {
if (ch != ' ') {
if (start + 1 == end && this.column > this.bestWidth && split) {
writeIndent();
} else {
int len = end - start;
this.column += len;
stream.write(text, start, len);
}
start = end;
}
} else {
if (Constant.LINEBR.has(ch, "\0 ")) {
int len = end - start;
this.column += len;
stream.write(text, start, len);
if (ch == 0) {
writeLineBreak(null);
}
start = end;
}
}
if (ch != 0) {
breaks = Constant.LINEBR.has(ch);
spaces = ch == ' ';
}
end++;
}
}
void writeLiteral(String text) throws IOException {
String hints = determineBlockHints(text);
writeIndicator("|" + hints, true, false, false);
if (hints.length() > 0 && (hints.charAt(hints.length() - 1)) == '+') {
openEnded = true;
}
writeLineBreak(null);
boolean breaks = true;
int start = 0, end = 0;
while (end <= text.length()) {
char ch = 0;
if (end < text.length()) {
ch = text.charAt(end);
}
if (breaks) {
if (ch == 0 || Constant.LINEBR.hasNo(ch)) {
String data = text.substring(start, end);
for (char br : data.toCharArray()) {
if (br == '\n') {
writeLineBreak(null);
} else {
writeLineBreak(String.valueOf(br));
}
}
if (ch != 0) {
writeIndent();
}
start = end;
}
} else {
if (ch == 0 || Constant.LINEBR.has(ch)) {
stream.write(text, start, end - start);
if (ch == 0) {
writeLineBreak(null);
}
start = end;
}
}
if (ch != 0) {
breaks = Constant.LINEBR.has(ch);
}
end++;
}
}
void writePlain(String text, boolean split) throws IOException {
if (rootContext) {
openEnded = true;
}
if (text.length() == 0) {
return;
}
if (!this.whitespace) {
this.column++;
stream.write(SPACE);
}
this.whitespace = false;
this.indention = false;
boolean spaces = false;
boolean breaks = false;
int start = 0, end = 0;
while (end <= text.length()) {
char ch = 0;
if (end < text.length()) {
ch = text.charAt(end);
}
if (spaces) {
if (ch != ' ') {
if (start + 1 == end && this.column > this.bestWidth && split) {
writeIndent();
this.whitespace = false;
this.indention = false;
} else {
int len = end - start;
this.column += len;
stream.write(text, start, len);
}
start = end;
}
} else if (breaks) {
if (Constant.LINEBR.hasNo(ch)) {
if (text.charAt(start) == '\n') {
writeLineBreak(null);
}
String data = text.substring(start, end);
for (char br : data.toCharArray()) {
if (br == '\n') {
writeLineBreak(null);
} else {
writeLineBreak(String.valueOf(br));
}
}
writeIndent();
this.whitespace = false;
this.indention = false;
start = end;
}
} else {
if (Constant.LINEBR.has(ch, "\0 ")) {
int len = end - start;
this.column += len;
stream.write(text, start, len);
start = end;
}
}
if (ch != 0) {
spaces = ch == ' ';
breaks = Constant.LINEBR.has(ch);
}
end++;
}
}
}
