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@@ -5,390 +5,316 @@
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*/
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package org.openzen.zenscript.shared;
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+import java.io.IOException;
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+import java.io.InputStream;
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+import java.util.Collection;
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+import java.util.HashMap;
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+import java.util.Map;
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+import java.util.Properties;
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+import java.util.logging.Level;
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+import java.util.logging.Logger;
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+import java.util.regex.Pattern;
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+
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/**
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*
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* @author Hoofdgebruiker
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*/
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public class StringUtils {
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+ private static final Map<String, CharacterEntity> NAMED_CHARACTER_ENTITIES;
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+ private static final Pattern MATCH_ACCENTS = Pattern.compile("\\p{M}");
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+
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+ static
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+ {
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+ NAMED_CHARACTER_ENTITIES = new HashMap<>();
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+
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+ Properties properties = new Properties();
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+ try {
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+ InputStream input = String.class.getResourceAsStream("/org/openzen/zenscript/shared/characterEntities.properties");
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+ if (input != null)
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+ properties.load(input);
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+ else
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+ System.out.println("Warning: could not load character entities");
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+ } catch (IOException ex) {
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+ Logger.getLogger(StringUtils.class.getName()).log(Level.SEVERE, null, ex);
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+ }
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+
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+ for (Object okey : properties.keySet()) {
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+ String key = okey.toString();
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+ char value = (char) Integer.parseInt(properties.getProperty(key));
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+ CharacterEntity entity = new CharacterEntity(key, value);
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+ NAMED_CHARACTER_ENTITIES.put(entity.stringValue, entity);
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+ }
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+ }
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/**
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+ * Left pads (prefixes) a string with characters until it reaches the given string
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+ * length. Does not do anything if the string length >= given length.
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*
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- * unescape_perl_string()
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- *
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- * Tom Christiansen <tchrist@perl.com> Sun Nov 28 12:55:24 MST 2010
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- *
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- * It's completely ridiculous that there's no standard unescape_java_string
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- * function. Since I have to do the damn thing myself, I might as well make
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- * it halfway useful by supporting things Java was too stupid to consider in
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- * strings:
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- *
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- * => "?" items are additions to Java string escapes but normal in Java
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- * regexes
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- *
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- * => "!" items are also additions to Java regex escapes
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- *
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- * Standard singletons: ?\a ?\e \f \n \r \t
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- *
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- * NB: \b is unsupported as backspace so it can pass-through to the regex
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- * translator untouched; I refuse to make anyone doublebackslash it as
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- * doublebackslashing is a Java idiocy I desperately wish would die out.
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- * There are plenty of other ways to write it:
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+ * @param value value to be padded
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+ * @param length desired string length
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+ * @param c padding character
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+ * @return padded string
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+ */
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+ public static String lpad(String value, int length, char c)
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+ {
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+ if (value.length() >= length)
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+ return value;
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+
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+ return times(c, length - value.length()) + value;
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+ }
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+
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+ /**
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+ * Right pads (suffixes) a string with characters until it reaches the given
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+ * string length. Does not do anything if the string length >= given length.
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*
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- * \cH, \12, \012, \x08 \x{8}, \u0008, \U00000008
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+ * @param value value to be padded
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+ * @param length desired string length
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+ * @param c padding character
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+ * @return padded string
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+ */
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+ public static String rpad(String value, int length, char c)
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+ {
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+ if (value.length() >= length)
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+ return value;
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+
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+ return value + times(c, length - value.length());
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+ }
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+
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+ /**
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+ * Constructs a string with count times the given character.
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*
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- * Octal escapes: \0 \0N \0NN \N \NN \NNN Can range up to !\777 not \377
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+ * @param c filling character
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+ * @param count character count
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+ * @return string value
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+ */
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+ public static String times(char c, int count)
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+ {
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+ char[] value = new char[count];
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+ for (int i = 0; i < count; i++) {
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+ value[i] = c;
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+ }
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+ return new String(value);
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+ }
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+
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+ /**
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+ * Unescapes a string escaped in one of following ways:
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*
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- * TODO: add !\o{NNNNN} last Unicode is 4177777 maxint is 37777777777
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+ * <ul>
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+ * <li>A string escaped with single quotes (<code>'Hello "my" world'</code>)</li>
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+ * <li>A string escaped with double quotes (<code>"Hello 'my' world"</code>)</li>
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+ * <li>A near-literal string (<code>@"C:\Program Files\"</code>) in which escape sequences
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+ * aren't processed but the " character cannot occur</li>
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+ * </ul>
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*
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- * Control chars: ?\cX Means: ord(X) ^ ord('@')
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+ * The following escape sequences are recognized:
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+ * <ul>
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+ * <li>\\</li>
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+ * <li>\'</li>
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+ * <li>\"</li>
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+ * <li>\&namedCharacterEntity; (note that although redundant, \&#ddd; and \&#xXXXX; are also allowed)</li>
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+ * <li>\t</li>
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+ * <li>\n</li>
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+ * <li>\r</li>
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+ * <li>\b</li>
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+ * <li>\f</li>
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+ * <li>\&uXXXX for unicode character points</li>
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+ * </ul>
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*
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- * Old hex escapes: \xXX unbraced must be 2 xdigits
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+ * @param escapedString escaped string
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+ * @return unescaped string
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+ */
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+ public static String unescape(String escapedString)
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+ {
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+ if (escapedString.length() < 2)
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+ throw new IllegalArgumentException("String is not quoted");
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+
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+ boolean isLiteral = escapedString.charAt(0) == '@';
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+ if (isLiteral)
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+ escapedString = escapedString.substring(1);
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+
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+ if (escapedString.charAt(0) != '"' && escapedString.charAt(0) != '\'')
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+ throw new IllegalArgumentException("String is not quoted");
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+
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+ char quoteCharacter = escapedString.charAt(0);
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+ if (escapedString.charAt(escapedString.length() - 1) != quoteCharacter)
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+ throw new IllegalArgumentException("Unbalanced quotes");
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+
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+ if (isLiteral)
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+ return escapedString.substring(1, escapedString.length() - 1);
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+
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+ StringBuilder result = new StringBuilder(escapedString.length() - 2);
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+
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+ for (int i = 1; i < escapedString.length() - 1; i++) {
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+ if (escapedString.charAt(i) == '\\') {
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+ if (i >= escapedString.length() - 1)
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+ throw new IllegalArgumentException("Unfinished escape sequence");
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+
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+ switch (escapedString.charAt(i + 1)) {
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+ case '\\': i++; result.append('\\'); break;
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+ case '&':
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+ CharacterEntity characterEntity = readCharacterEntity(escapedString, i + 1);
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+ i += characterEntity.stringValue.length() + 2;
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+ result.append(characterEntity.charValue);
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+ break;
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+ case 't': i++; result.append('\t'); break;
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+ case 'r': i++; result.append('\r'); break;
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+ case 'n': i++; result.append('\n'); break;
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+ case 'b': i++; result.append('\b'); break;
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+ case 'f': i++; result.append('\f'); break;
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+ case '"': i++; result.append('\"'); break;
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+ case '\'': i++; result.append('\''); break;
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+ case 'u':
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+ if (i >= escapedString.length() - 5)
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+ throw new IllegalArgumentException("Unfinished escape sequence");
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+ int hex0 = readHexCharacter(escapedString.charAt(i + 2));
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+ int hex1 = readHexCharacter(escapedString.charAt(i + 3));
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+ int hex2 = readHexCharacter(escapedString.charAt(i + 4));
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+ int hex3 = readHexCharacter(escapedString.charAt(i + 5));
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+ i += 5;
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+ result.append((hex0 << 12) | (hex1 << 8) | (hex2 << 4) | hex3);
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+ default:
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+ throw new IllegalArgumentException("Illegal escape sequence");
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+ }
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+ }
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+ else
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+ result.append(escapedString.charAt(i));
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+ }
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+
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+ return result.toString();
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+ }
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+
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+ /**
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+ * Escapes special characters in the given string, including ". (but not ').
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+ * Adds opening and closing quotes.
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*
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- * Perl hex escapes: !\x{XXX} braced may be 1-8 xdigits NB: proper Unicode
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- * never needs more than 6, as highest valid codepoint is 0x10FFFF, not
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- * maxint 0xFFFFFFFF
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+ * @param value value to be escaped
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+ * @param quote character (' or ")
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+ * @param escapeUnicode true to escape any non-ascii value, false to leave them be
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+ * @return escaped value
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+ */
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+ public static String escape(String value, char quote, boolean escapeUnicode)
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+ {
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+ StringBuilder output = new StringBuilder();
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+ output.append(quote);
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+ for (char c : value.toCharArray()) {
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+ switch (c) {
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+ case '"': if (quote == '"') output.append("\\\""); break;
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+ case '\'': if (quote == '\'') output.append("\\\'"); break;
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+ case '\n': output.append("\\n"); break;
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+ case '\r': output.append("\\r"); break;
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+ case '\t': output.append("\\t"); break;
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+ default:
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+ if (escapeUnicode && c > 127) {
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+ output.append("\\u");
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+ output.append(lpad(Integer.toHexString(c), 4, '0'));
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+ } else {
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+ output.append(c);
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+ }
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+ }
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+ }
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+
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+ output.append(quote);
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+ return output.toString();
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+ }
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+
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+ /**
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+ * Reads a single hex digit and converts it to a value 0-15.
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*
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- * Lame Java escape: \[IDIOT JAVA PREPROCESSOR]uXXXX must be exactly 4
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- * xdigits;
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+ * @param hex hex digit
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+ * @return converted value
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+ */
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+ public static int readHexCharacter(char hex)
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+ {
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+ if (hex >= '0' && hex <= '9')
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+ return hex - '0';
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+
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+ if (hex >= 'A' && hex <= 'F')
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+ return hex - 'A' + 10;
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+
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+ if (hex >= 'a' && hex <= 'f')
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+ return hex - 'a' + 10;
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+
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+ throw new IllegalArgumentException("Illegal hex character: " + hex);
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+ }
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+
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240
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+ /**
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241
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+ * Retrieves all official named character entities.
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242
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*
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- * I can't write XXXX in this comment where it belongs because the damned
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- * Java Preprocessor can't mind its own business. Idiots!
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+ * @return named character entities
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+ */
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245
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+ public static Collection<CharacterEntity> getNamedCharacterEntities()
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246
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+ {
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+ return NAMED_CHARACTER_ENTITIES.values();
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248
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+ }
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+
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+ /**
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251
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+ * Reads a single character entity (formatted as &characterEntity;) at the
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+ * given string offset.
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253
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*
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57
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- * Lame Python escape: !\UXXXXXXXX must be exactly 8 xdigits
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254
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+ * The following formats are supported:
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255
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+ * <ul>
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256
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+ * <li>&namedCharacterEntity;</li>
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257
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+ * <li>&#ddd</li>
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+ * <li>&#xXXXX</li>
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+ * </ul>
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260
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*
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59
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- * TODO: Perl translation escapes: \Q \U \L \E \[IDIOT JAVA PREPROCESSOR]u
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60
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- * \l These are not so important to cover if you're passing the result to
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61
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- * Pattern.compile(), since it handles them for you further downstream. Hm,
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62
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- * what about \[IDIOT JAVA PREPROCESSOR]u?
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261
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+ * The returned value includes the character entity, without the enclosing
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+ * & and ; characters.
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263
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*
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64
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- * @param oldstr
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65
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- * @return
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264
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+ * @param str string value to search in
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265
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+ * @param offset offset to look at
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266
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+ * @return character entity
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267
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+ * @throws IllegalArgumentException if the given string does not contain a
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+ * valid character entity at the given position
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269
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*/
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67
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- public static String unescapeString(String oldstr) {
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68
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- if ((oldstr.charAt(0) != '"' || oldstr.charAt(oldstr.length() - 1) != '"')
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69
|
|
- && (oldstr.charAt(0) != '\'' || oldstr.charAt(oldstr.length() - 1) != '\'')) {
|
|
70
|
|
- // TODO: error
|
|
71
|
|
- // throw new TweakerExecuteException("Not a valid string constant: "
|
|
72
|
|
- // + oldstr);
|
|
73
|
|
- }
|
|
74
|
|
- oldstr = oldstr.substring(1, oldstr.length() - 1);
|
|
75
|
|
-
|
|
76
|
|
- /*
|
|
77
|
|
- * In contrast to fixing Java's broken regex charclasses, this one need
|
|
78
|
|
- * be no bigger, as unescaping shrinks the string here, where in the
|
|
79
|
|
- * other one, it grows it.
|
|
80
|
|
- */
|
|
81
|
|
-
|
|
82
|
|
- StringBuilder newstr = new StringBuilder(oldstr.length());
|
|
83
|
|
-
|
|
84
|
|
- boolean saw_backslash = false;
|
|
85
|
|
-
|
|
86
|
|
- for (int i = 0; i < oldstr.length(); i++) {
|
|
87
|
|
- int cp = oldstr.codePointAt(i);
|
|
88
|
|
- if (oldstr.codePointAt(i) > Character.MAX_VALUE) {
|
|
89
|
|
- i++;
|
|
90
|
|
- /**** WE HATES UTF-16! WE HATES IT FOREVERSES!!! ****/
|
|
91
|
|
- }
|
|
92
|
|
-
|
|
93
|
|
- if (!saw_backslash) {
|
|
94
|
|
- if (cp == '\\') {
|
|
95
|
|
- saw_backslash = true;
|
|
96
|
|
- } else {
|
|
97
|
|
- newstr.append(Character.toChars(cp));
|
|
98
|
|
- }
|
|
99
|
|
- continue; /* switch */
|
|
100
|
|
- }
|
|
101
|
|
-
|
|
102
|
|
- if (cp == '\\') {
|
|
103
|
|
- saw_backslash = false;
|
|
104
|
|
- newstr.append('\\');
|
|
105
|
|
- continue; /* switch */
|
|
106
|
|
- }
|
|
107
|
|
-
|
|
108
|
|
- switch (cp) {
|
|
109
|
|
-
|
|
110
|
|
- case 'r':
|
|
111
|
|
- newstr.append('\r');
|
|
112
|
|
- break; /* switch */
|
|
113
|
|
-
|
|
114
|
|
- case 'n':
|
|
115
|
|
- newstr.append('\n');
|
|
116
|
|
- break; /* switch */
|
|
117
|
|
-
|
|
118
|
|
- case 'f':
|
|
119
|
|
- newstr.append('\f');
|
|
120
|
|
- break; /* switch */
|
|
121
|
|
-
|
|
122
|
|
- /* PASS a \b THROUGH!! */
|
|
123
|
|
- case 'b':
|
|
124
|
|
- newstr.append("\\b");
|
|
125
|
|
- break; /* switch */
|
|
126
|
|
-
|
|
127
|
|
- case 't':
|
|
128
|
|
- newstr.append('\t');
|
|
129
|
|
- break; /* switch */
|
|
130
|
|
-
|
|
131
|
|
- case 'a':
|
|
132
|
|
- newstr.append('\007');
|
|
133
|
|
- break; /* switch */
|
|
134
|
|
-
|
|
135
|
|
- case 'e':
|
|
136
|
|
- newstr.append('\033');
|
|
137
|
|
- break; /* switch */
|
|
138
|
|
-
|
|
139
|
|
- /*
|
|
140
|
|
- * A "control" character is what you get when you xor its
|
|
141
|
|
- * codepoint with '@'==64. This only makes sense for ASCII, and
|
|
142
|
|
- * may not yield a "control" character after all.
|
|
143
|
|
- *
|
|
144
|
|
- * Strange but true: "\c{" is ";", "\c}" is "=", etc.
|
|
145
|
|
- */
|
|
146
|
|
- case 'c': {
|
|
147
|
|
- if (++i == oldstr.length()) {
|
|
148
|
|
- // TODO: error
|
|
149
|
|
- // throw new TweakerExecuteException("trailing \\c");
|
|
150
|
|
- }
|
|
151
|
|
- cp = oldstr.codePointAt(i);
|
|
152
|
|
- /*
|
|
153
|
|
- * don't need to grok surrogates, as next line blows them up
|
|
154
|
|
- */
|
|
155
|
|
- if (cp > 0x7f) {
|
|
156
|
|
- // TODO: error
|
|
157
|
|
- // throw new TweakerExecuteException(
|
|
158
|
|
- // "expected ASCII after \\c");
|
|
159
|
|
- }
|
|
160
|
|
- newstr.append(Character.toChars(cp ^ 64));
|
|
161
|
|
- break; /* switch */
|
|
162
|
|
- }
|
|
163
|
|
-
|
|
164
|
|
- case '8':
|
|
165
|
|
- case '9':
|
|
166
|
|
- // TODO: error
|
|
167
|
|
- // throw new TweakerExecuteException("illegal octal digit");
|
|
168
|
|
- /* NOTREACHED */
|
|
169
|
|
-
|
|
170
|
|
- /*
|
|
171
|
|
- * may be 0 to 2 octal digits following this one so back up
|
|
172
|
|
- * one for fallthrough to next case; unread this digit and
|
|
173
|
|
- * fall through to next case.
|
|
174
|
|
- */
|
|
175
|
|
- case '1':
|
|
176
|
|
- case '2':
|
|
177
|
|
- case '3':
|
|
178
|
|
- case '4':
|
|
179
|
|
- case '5':
|
|
180
|
|
- case '6':
|
|
181
|
|
- case '7':
|
|
182
|
|
- --i;
|
|
183
|
|
- /* FALLTHROUGH */
|
|
184
|
|
-
|
|
185
|
|
- /*
|
|
186
|
|
- * Can have 0, 1, or 2 octal digits following a 0 this
|
|
187
|
|
- * permits larger values than octal 377, up to octal 777.
|
|
188
|
|
- */
|
|
189
|
|
- case '0': {
|
|
190
|
|
- if (i + 1 == oldstr.length()) {
|
|
191
|
|
- /* found \0 at end of string */
|
|
192
|
|
- newstr.append(Character.toChars(0));
|
|
193
|
|
- break; /* switch */
|
|
194
|
|
- }
|
|
195
|
|
- i++;
|
|
196
|
|
- int digits = 0;
|
|
197
|
|
- int j;
|
|
198
|
|
- for (j = 0; j <= 2; j++) {
|
|
199
|
|
- if (i + j == oldstr.length()) {
|
|
200
|
|
- break; /* for */
|
|
201
|
|
- }
|
|
202
|
|
- /* safe because will unread surrogate */
|
|
203
|
|
- int ch = oldstr.charAt(i + j);
|
|
204
|
|
- if (ch < '0' || ch > '7') {
|
|
205
|
|
- break; /* for */
|
|
206
|
|
- }
|
|
207
|
|
- digits++;
|
|
208
|
|
- }
|
|
209
|
|
- if (digits == 0) {
|
|
210
|
|
- --i;
|
|
211
|
|
- newstr.append('\0');
|
|
212
|
|
- break; /* switch */
|
|
213
|
|
- }
|
|
214
|
|
- int value = 0;
|
|
215
|
|
- try {
|
|
216
|
|
- value = Integer
|
|
217
|
|
- .parseInt(oldstr.substring(i, i + digits), 8);
|
|
218
|
|
- } catch (NumberFormatException nfe) {
|
|
219
|
|
- // TODO: error
|
|
220
|
|
- // throw new TweakerExecuteException(
|
|
221
|
|
- // "invalid octal value for \\0 escape");
|
|
222
|
|
- }
|
|
223
|
|
- newstr.append(Character.toChars(value));
|
|
224
|
|
- i += digits - 1;
|
|
225
|
|
- break; /* switch */
|
|
226
|
|
- } /* end case '0' */
|
|
227
|
|
-
|
|
228
|
|
- case 'x': {
|
|
229
|
|
- if (i + 2 > oldstr.length()) {
|
|
230
|
|
- // TODO: error
|
|
231
|
|
- // throw new TweakerExecuteException(
|
|
232
|
|
- // "string too short for \\x escape");
|
|
233
|
|
- }
|
|
234
|
|
- i++;
|
|
235
|
|
- boolean saw_brace = false;
|
|
236
|
|
- if (oldstr.charAt(i) == '{') {
|
|
237
|
|
- /* ^^^^^^ ok to ignore surrogates here */
|
|
238
|
|
- i++;
|
|
239
|
|
- saw_brace = true;
|
|
240
|
|
- }
|
|
241
|
|
- int j;
|
|
242
|
|
- for (j = 0; j < 8; j++) {
|
|
243
|
|
-
|
|
244
|
|
- if (!saw_brace && j == 2) {
|
|
245
|
|
- break; /* for */
|
|
246
|
|
- }
|
|
247
|
|
-
|
|
248
|
|
- /*
|
|
249
|
|
- * ASCII test also catches surrogates
|
|
250
|
|
- */
|
|
251
|
|
- int ch = oldstr.charAt(i + j);
|
|
252
|
|
- if (ch > 127) {
|
|
253
|
|
- // TODO: error
|
|
254
|
|
- // throw new TweakerExecuteException(
|
|
255
|
|
- // "illegal non-ASCII hex digit in \\x escape");
|
|
256
|
|
- }
|
|
257
|
|
-
|
|
258
|
|
- if (saw_brace && ch == '}') {
|
|
259
|
|
- break; /* for */
|
|
260
|
|
- }
|
|
261
|
|
-
|
|
262
|
|
- if (!((ch >= '0' && ch <= '9') || (ch >= 'a' && ch <= 'f') || (ch >= 'A' && ch <= 'F'))) {
|
|
263
|
|
- // TODO: error
|
|
264
|
|
- // throw new TweakerExecuteException(String.format(
|
|
265
|
|
- // "illegal hex digit #%d '%c' in \\x", ch, ch));
|
|
266
|
|
- }
|
|
267
|
|
-
|
|
268
|
|
- }
|
|
269
|
|
- if (j == 0) {
|
|
270
|
|
- // TODO: error
|
|
271
|
|
- // throw new TweakerExecuteException(
|
|
272
|
|
- // "empty braces in \\x{} escape");
|
|
273
|
|
- }
|
|
274
|
|
- int value = 0;
|
|
275
|
|
- try {
|
|
276
|
|
- value = Integer.parseInt(oldstr.substring(i, i + j), 16);
|
|
277
|
|
- } catch (NumberFormatException nfe) {
|
|
278
|
|
- // TODO: error
|
|
279
|
|
- // throw new TweakerExecuteException(
|
|
280
|
|
- // "invalid hex value for \\x escape");
|
|
281
|
|
- }
|
|
282
|
|
- newstr.append(Character.toChars(value));
|
|
283
|
|
- if (saw_brace) {
|
|
284
|
|
- j++;
|
|
285
|
|
- }
|
|
286
|
|
- i += j - 1;
|
|
287
|
|
- break; /* switch */
|
|
288
|
|
- }
|
|
289
|
|
-
|
|
290
|
|
- case 'u': {
|
|
291
|
|
- if (i + 4 > oldstr.length()) {
|
|
292
|
|
- // TODO: error
|
|
293
|
|
- // throw new TweakerExecuteException(
|
|
294
|
|
- // "string too short for \\u escape");
|
|
295
|
|
- }
|
|
296
|
|
- i++;
|
|
297
|
|
- int j;
|
|
298
|
|
- for (j = 0; j < 4; j++) {
|
|
299
|
|
- /* this also handles the surrogate issue */
|
|
300
|
|
- if (oldstr.charAt(i + j) > 127) {
|
|
301
|
|
- // TODO: error
|
|
302
|
|
- // throw new TweakerExecuteException(
|
|
303
|
|
- // "illegal non-ASCII hex digit in \\u escape");
|
|
304
|
|
- }
|
|
305
|
|
- }
|
|
306
|
|
- int value = 0;
|
|
307
|
|
- try {
|
|
308
|
|
- value = Integer.parseInt(oldstr.substring(i, i + j), 16);
|
|
309
|
|
- } catch (NumberFormatException nfe) {
|
|
310
|
|
- // TODO: error
|
|
311
|
|
- // throw new TweakerExecuteException(
|
|
312
|
|
- // "invalid hex value for \\u escape");
|
|
313
|
|
- }
|
|
314
|
|
- newstr.append(Character.toChars(value));
|
|
315
|
|
- i += j - 1;
|
|
316
|
|
- break; /* switch */
|
|
317
|
|
- }
|
|
318
|
|
-
|
|
319
|
|
- case 'U': {
|
|
320
|
|
- if (i + 8 > oldstr.length()) {
|
|
321
|
|
- // TODO: error
|
|
322
|
|
- // throw new TweakerExecuteException(
|
|
323
|
|
- // "string too short for \\U escape");
|
|
324
|
|
- }
|
|
325
|
|
- i++;
|
|
326
|
|
- int j;
|
|
327
|
|
- for (j = 0; j < 8; j++) {
|
|
328
|
|
- /* this also handles the surrogate issue */
|
|
329
|
|
- if (oldstr.charAt(i + j) > 127) {
|
|
330
|
|
- // TODO: error
|
|
331
|
|
- // throw new TweakerExecuteException(
|
|
332
|
|
- // "illegal non-ASCII hex digit in \\U escape");
|
|
333
|
|
- }
|
|
334
|
|
- }
|
|
335
|
|
- int value = 0;
|
|
336
|
|
- try {
|
|
337
|
|
- value = Integer.parseInt(oldstr.substring(i, i + j), 16);
|
|
338
|
|
- } catch (NumberFormatException nfe) {
|
|
339
|
|
- // TODO: error
|
|
340
|
|
- // throw new TweakerExecuteException(
|
|
341
|
|
- // "invalid hex value for \\U escape");
|
|
342
|
|
- }
|
|
343
|
|
- newstr.append(Character.toChars(value));
|
|
344
|
|
- i += j - 1;
|
|
345
|
|
- break; /* switch */
|
|
346
|
|
- }
|
|
347
|
|
-
|
|
348
|
|
- default:
|
|
349
|
|
- newstr.append('\\');
|
|
350
|
|
- newstr.append(Character.toChars(cp));
|
|
351
|
|
- /*
|
|
352
|
|
- * say(String.format(
|
|
353
|
|
- * "DEFAULT unrecognized escape %c passed through", cp));
|
|
354
|
|
- */
|
|
355
|
|
- break; /* switch */
|
|
356
|
|
-
|
|
|
270
|
+ public static CharacterEntity readCharacterEntity(String str, int offset)
|
|
|
271
|
+ {
|
|
|
272
|
+ if (offset + 3 >= str.length())
|
|
|
273
|
+ throw new IllegalArgumentException("Not a proper character entity");
|
|
|
274
|
+ if (str.charAt(offset) != '&')
|
|
|
275
|
+ throw new IllegalArgumentException("Not a proper character entity");
|
|
|
276
|
+
|
|
|
277
|
+ int semi = str.indexOf(';', offset);
|
|
|
278
|
+ if (semi < 0)
|
|
|
279
|
+ throw new IllegalArgumentException("Not a proper character entity");
|
|
|
280
|
+
|
|
|
281
|
+ String entity = str.substring(offset + 1, semi);
|
|
|
282
|
+ if (entity.isEmpty())
|
|
|
283
|
+ throw new IllegalArgumentException("Not a proper character entity");
|
|
|
284
|
+
|
|
|
285
|
+ if (NAMED_CHARACTER_ENTITIES.containsKey(entity))
|
|
|
286
|
+ return NAMED_CHARACTER_ENTITIES.get(entity);
|
|
|
287
|
+
|
|
|
288
|
+ if (entity.charAt(0) == '#') {
|
|
|
289
|
+ if (entity.length() < 2)
|
|
|
290
|
+ throw new IllegalArgumentException("Not a proper character entity");
|
|
|
291
|
+
|
|
|
292
|
+ if (str.charAt(1) == 'x') {
|
|
|
293
|
+ // hex character entity
|
|
|
294
|
+ if (entity.length() != 7)
|
|
|
295
|
+ throw new IllegalArgumentException("Not a proper character entity");
|
|
|
296
|
+
|
|
|
297
|
+ int ivalue = Integer.parseInt(entity.substring(2), 16);
|
|
|
298
|
+ return new CharacterEntity(entity, (char) ivalue);
|
|
|
299
|
+ } else {
|
|
|
300
|
+ // decimal character entity
|
|
|
301
|
+ int ivalue = Integer.parseInt(entity.substring(1));
|
|
|
302
|
+ return new CharacterEntity(entity, (char) ivalue);
|
|
357
|
303
|
}
|
|
358
|
|
- saw_backslash = false;
|
|
359
|
|
- }
|
|
360
|
|
-
|
|
361
|
|
- /* weird to leave one at the end */
|
|
362
|
|
- if (saw_backslash) {
|
|
363
|
|
- newstr.append('\\');
|
|
364
|
304
|
}
|
|
365
|
305
|
|
|
366
|
|
- String result = newstr.toString();
|
|
367
|
|
- return result;
|
|
|
306
|
+ throw new IllegalArgumentException("Not a valid named character entity");
|
|
368
|
307
|
}
|
|
369
|
|
-
|
|
370
|
|
- /*
|
|
371
|
|
- * Return a string "U+XX.XXX.XXXX" etc, where each XX set is the xdigits of
|
|
372
|
|
- * the logical Unicode code point. No bloody brain-damaged UTF-16 surrogate
|
|
373
|
|
- * crap, just true logical characters.
|
|
374
|
|
- */
|
|
375
|
|
- private static String uniplus(String s) {
|
|
376
|
|
- if (s.length() == 0) {
|
|
377
|
|
- return "";
|
|
378
|
|
- }
|
|
379
|
|
- /* This is just the minimum; sb will grow as needed. */
|
|
380
|
|
- StringBuilder sb = new StringBuilder(2 + 3 * s.length());
|
|
381
|
|
- sb.append("U+");
|
|
382
|
|
- for (int i = 0; i < s.length(); i++) {
|
|
383
|
|
- sb.append(String.format("%X", s.codePointAt(i)));
|
|
384
|
|
- if (s.codePointAt(i) > Character.MAX_VALUE) {
|
|
385
|
|
- i++;
|
|
386
|
|
- /**** WE HATES UTF-16! WE HATES IT FOREVERSES!!! ****/
|
|
387
|
|
- }
|
|
388
|
|
- if (i + 1 < s.length()) {
|
|
389
|
|
- sb.append(".");
|
|
390
|
|
- }
|
|
|
308
|
+
|
|
|
309
|
+ public static class CharacterEntity
|
|
|
310
|
+ {
|
|
|
311
|
+ public char charValue;
|
|
|
312
|
+ public String stringValue;
|
|
|
313
|
+
|
|
|
314
|
+ public CharacterEntity(String stringValue, char charValue)
|
|
|
315
|
+ {
|
|
|
316
|
+ this.charValue = charValue;
|
|
|
317
|
+ this.stringValue = stringValue;
|
|
391
|
318
|
}
|
|
392
|
|
- return sb.toString();
|
|
393
|
319
|
}
|
|
394
|
320
|
}
|
Stan Hebben
6 年之前