com.amihaiemil.eoyaml.ReadYamlMapping Maven / Gradle / Ivy
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YAML for Java 8 and above. Very similar to the JSON-P api.
/**
* Copyright (c) 2016-2020, Mihai Emil Andronache
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
package com.amihaiemil.eoyaml;
import com.amihaiemil.eoyaml.exceptions.YamlReadingException;
import java.util.*;
/**
* YamlMapping read from somewhere. YAML directives and
* document start/end markers are ignored. This is assumed
* to be a plain YAML mapping.
* @checkstyle CyclomaticComplexity (300 lines)
* @author Mihai Andronache ([email protected])
* @version $Id: 376539b4ff560ea7f6e854e2fd988c8298ae7209 $
* @since 1.0.0
*/
final class ReadYamlMapping extends BaseYamlMapping {
/**
* Yaml line just previous to the one where this mapping starts. E.g.
*
* 0 mapping:
* 1 key1: elem1
* 2 key2: elem2
*
* In the above example the mapping consists of keys key1 and key2, while
* "previous" is line 0. If the mapping starts at the root, then line
* "previous" is {@link com.amihaiemil.eoyaml.YamlLine.NullYamlLine}; E.g.
*
* 0 key1: elem1
* 1 key2: elem2
*
*/
private YamlLine previous;
/**
* All the lines of this YAML document.
*/
private final AllYamlLines all;
/**
* Only the significant lines of this YamlMapping.
*/
private final YamlLines significant;
/**
* Ctor.
* @param lines Given lines.
*/
ReadYamlMapping(final AllYamlLines lines) {
this(new YamlLine.NullYamlLine(), lines);
}
/**
* Ctor.
* @param previous Line just before the start of this mapping.
* @param lines Given lines.
*/
ReadYamlMapping(final YamlLine previous, final AllYamlLines lines) {
this.previous = previous;
this.all = lines;
this.significant = new SameIndentationLevel(
new WellIndented(
new Skip(
lines,
line -> line.number() <= previous.number(),
line -> line.trimmed().startsWith("#"),
line -> line.trimmed().startsWith("---"),
line -> line.trimmed().startsWith("..."),
line -> line.trimmed().startsWith("%"),
line -> line.trimmed().startsWith("!!")
)
)
);
}
@Override
public Set keys() {
final Set keys = new LinkedHashSet<>();
for (final YamlLine line : this.significant) {
final String trimmed = line.trimmed();
if(trimmed.startsWith(":")) {
continue;
} else if ("?".equals(trimmed)) {
keys.add(this.significant.toYamlNode(line));
} else {
if(!trimmed.contains(":")) {
throw new YamlReadingException(
"Expected scalar key on line "
+ (line.number() + 1) + "."
+ " The line should have the format "
+ "'key: value' or 'key:'. "
+ "Instead, the line is: "
+ "[" + line.trimmed() + "]."
);
}
final String key = trimmed.substring(
0, trimmed.indexOf(":")).trim();
if(!key.isEmpty()) {
keys.add(new PlainStringScalar(key));
}
}
}
return keys;
}
@Override
public YamlNode value(final YamlNode key) {
final YamlNode value;
if(key instanceof Scalar) {
value = this.valueOfStringKey(((Scalar) key).value());
} else {
value = this.valueOfNodeKey(key);
}
return value;
}
@Override
public Comment comment() {
return new ReadComment(
new FirstCommentFound(
new Backwards(
new Skip(
this.all,
line -> {
final boolean skip;
if(this.previous.number() < 0) {
if(this.significant.iterator().hasNext()) {
skip = line.number() >= this.significant
.iterator().next().number();
} else {
skip = false;
}
} else {
skip = line.number() >= this.previous.number();
}
return skip;
},
line -> line.trimmed().startsWith("---"),
line -> line.trimmed().startsWith("..."),
line -> line.trimmed().startsWith("%"),
line -> line.trimmed().startsWith("!!")
)
)
),
this
);
}
/**
* The YamlNode value associated with a String (scalar) key.
* @param key String key.
* @return YamlNode.
*/
private YamlNode valueOfStringKey(final String key) {
YamlNode value = null;
for (final YamlLine line : this.significant) {
final String trimmed = line.trimmed();
if(trimmed.endsWith(key + ":")
|| trimmed.matches("^" + key + "\\:[ ]*\\>$")
|| trimmed.matches("^" + key + "\\:[ ]*\\|$")
) {
value = this.significant.toYamlNode(line);
} else if(trimmed.startsWith(key + ":")
&& trimmed.length() > 1
) {
value = new ReadPlainScalar(this.all, line);
}
}
return value;
}
/**
* The YamlNode value associated with a YamlNode key
* (a "complex" key starting with '?').
* @param key YamlNode key.
* @return YamlNode.
*/
private YamlNode valueOfNodeKey(final YamlNode key) {
YamlNode value = null;
final Iterator linesIt = this.significant.iterator();
while(linesIt.hasNext()) {
final YamlLine line = linesIt.next();
final String trimmed = line.trimmed();
if("?".equals(trimmed)) {
final YamlNode keyNode = this.significant.toYamlNode(line);
if(keyNode.equals(key)) {
final YamlLine colonLine = linesIt.next();
if(":".equals(colonLine.trimmed())
|| colonLine.trimmed().matches("^\\:[ ]*\\>$")
|| colonLine.trimmed().matches("^\\:[ ]*\\|$")
) {
value = this.significant.toYamlNode(colonLine);
} else if(colonLine.trimmed().startsWith(":")
&& (colonLine.trimmed().length() > 1)
){
value = new ReadPlainScalar(this.all, colonLine);
} else {
throw new YamlReadingException(
"No value found for existing complex key: "
+ System.lineSeparator()
+ ((BaseYamlNode) key).toString()
);
}
break;
}
}
}
return value;
}
}
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