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Diffstat (limited to 'src/main/java/org/apache/commons/lang3/text/translate/UnicodeEscaper.java')
-rw-r--r-- | src/main/java/org/apache/commons/lang3/text/translate/UnicodeEscaper.java | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/src/main/java/org/apache/commons/lang3/text/translate/UnicodeEscaper.java b/src/main/java/org/apache/commons/lang3/text/translate/UnicodeEscaper.java new file mode 100644 index 000000000..0f518c0ba --- /dev/null +++ b/src/main/java/org/apache/commons/lang3/text/translate/UnicodeEscaper.java @@ -0,0 +1,140 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You 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.apache.commons.lang3.text.translate; + +import java.io.IOException; +import java.io.Writer; + +/** + * Translates code points to their Unicode escaped value. + * + * @since 3.0 + * @deprecated As of 3.6, use Apache Commons Text + * <a href="https://commons.apache.org/proper/commons-text/javadocs/api-release/org/apache/commons/text/translate/UnicodeEscaper.html"> + * UnicodeEscaper</a> instead + */ +@Deprecated +public class UnicodeEscaper extends CodePointTranslator { + + private final int below; + private final int above; + private final boolean between; + + /** + * Constructs a {@link UnicodeEscaper} for all characters. + */ + public UnicodeEscaper() { + this(0, Integer.MAX_VALUE, true); + } + + /** + * Constructs a {@link UnicodeEscaper} for the specified range. This is + * the underlying method for the other constructors/builders. The {@code below} + * and {@code above} boundaries are inclusive when {@code between} is + * {@code true} and exclusive when it is {@code false}. + * + * @param below int value representing the lowest code point boundary + * @param above int value representing the highest code point boundary + * @param between whether to escape between the boundaries or outside them + */ + protected UnicodeEscaper(final int below, final int above, final boolean between) { + this.below = below; + this.above = above; + this.between = between; + } + + /** + * Constructs a {@link UnicodeEscaper} below the specified value (exclusive). + * + * @param codePoint below which to escape + * @return the newly created {@link UnicodeEscaper} instance + */ + public static UnicodeEscaper below(final int codePoint) { + return outsideOf(codePoint, Integer.MAX_VALUE); + } + + /** + * Constructs a {@link UnicodeEscaper} above the specified value (exclusive). + * + * @param codePoint above which to escape + * @return the newly created {@link UnicodeEscaper} instance + */ + public static UnicodeEscaper above(final int codePoint) { + return outsideOf(0, codePoint); + } + + /** + * Constructs a {@link UnicodeEscaper} outside of the specified values (exclusive). + * + * @param codePointLow below which to escape + * @param codePointHigh above which to escape + * @return the newly created {@link UnicodeEscaper} instance + */ + public static UnicodeEscaper outsideOf(final int codePointLow, final int codePointHigh) { + return new UnicodeEscaper(codePointLow, codePointHigh, false); + } + + /** + * Constructs a {@link UnicodeEscaper} between the specified values (inclusive). + * + * @param codePointLow above which to escape + * @param codePointHigh below which to escape + * @return the newly created {@link UnicodeEscaper} instance + */ + public static UnicodeEscaper between(final int codePointLow, final int codePointHigh) { + return new UnicodeEscaper(codePointLow, codePointHigh, true); + } + + /** + * {@inheritDoc} + */ + @Override + public boolean translate(final int codePoint, final Writer out) throws IOException { + if (between) { + if (codePoint < below || codePoint > above) { + return false; + } + } else if (codePoint >= below && codePoint <= above) { + return false; + } + + // TODO: Handle potential + sign per various Unicode escape implementations + if (codePoint > 0xffff) { + out.write(toUtf16Escape(codePoint)); + } else { + out.write("\\u"); + out.write(HEX_DIGITS[(codePoint >> 12) & 15]); + out.write(HEX_DIGITS[(codePoint >> 8) & 15]); + out.write(HEX_DIGITS[(codePoint >> 4) & 15]); + out.write(HEX_DIGITS[(codePoint) & 15]); + } + return true; + } + + /** + * Converts the given code point to a hex string of the form {@code "\\uXXXX"} + * + * @param codePoint + * a Unicode code point + * @return the hex string for the given code point + * + * @since 3.2 + */ + protected String toUtf16Escape(final int codePoint) { + return "\\u" + hex(codePoint); + } +} |