diff options
Diffstat (limited to 'linguistics/src/main/java/com/yahoo/language/process/SpecialTokens.java')
-rw-r--r-- | linguistics/src/main/java/com/yahoo/language/process/SpecialTokens.java | 141 |
1 files changed, 0 insertions, 141 deletions
diff --git a/linguistics/src/main/java/com/yahoo/language/process/SpecialTokens.java b/linguistics/src/main/java/com/yahoo/language/process/SpecialTokens.java deleted file mode 100644 index 465d9b754b3..00000000000 --- a/linguistics/src/main/java/com/yahoo/language/process/SpecialTokens.java +++ /dev/null @@ -1,141 +0,0 @@ -// Copyright Verizon Media. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root. -package com.yahoo.language.process; - -import java.util.ArrayList; -import java.util.Collections; -import java.util.Iterator; -import java.util.List; -import java.util.Locale; -import java.util.Map; -import java.util.Objects; -import java.util.stream.Collectors; - -import static com.yahoo.language.LinguisticsCase.toLowerCase; - -/** - * An immutable list of special tokens - strings which should override the normal tokenizer semantics - * and be tokenized into a single token. Special tokens are case insensitive. - * - * @author bratseth - */ -public class SpecialTokens { - - private static final SpecialTokens empty = new SpecialTokens("(empty)", List.of()); - - private final String name; - private final int maximumLength; - private final List<Token> tokens; - private final Map<String, String> tokenMap; - - public SpecialTokens(String name, List<Token> tokens) { - tokens.stream().peek(token -> token.validate()); - List<Token> mutableTokens = new ArrayList<>(tokens); - Collections.sort(mutableTokens); - this.name = name; - this.maximumLength = tokens.stream().mapToInt(token -> token.token().length()).max().orElse(0); - this.tokens = List.copyOf(mutableTokens); - this.tokenMap = tokens.stream().collect(Collectors.toUnmodifiableMap(t -> t.token(), t -> t.replacement())); - } - - /** Returns the name of this special tokens list */ - public String name() { - return name; - } - - /** - * Returns the tokens of this as an immutable map from token to replacement. - * Tokens which do not have a replacement token maps to themselves. - */ - public Map<String, String> asMap() { return tokenMap; } - - /** - * Returns the special token starting at the start of the given string, or null if no - * special token starts at this string - * - * @param string the string to search for a special token at the start position - * @param substring true to allow the special token to be followed by a character which does not - * mark the end of a token - */ - public Token tokenize(String string, boolean substring) { - // XXX detonator pattern token.length may be != the length of the - // matching data in string, ref caseIndependentLength(String) - String input = toLowerCase(string.substring(0, Math.min(string.length(), maximumLength))); - for (Iterator<Token> i = tokens.iterator(); i.hasNext();) { - Token special = i.next(); - - if (input.startsWith(special.token())) { - if (string.length() == special.token().length() || substring || tokenEndsAt(special.token().length(), string)) - return special; - } - } - return null; - } - - private boolean tokenEndsAt(int position, String string) { - return !Character.isLetterOrDigit(string.charAt(position)); - } - - public static SpecialTokens empty() { return empty; } - - /** An immutable special token */ - public final static class Token implements Comparable<Token> { - - private final String token; - private final String replacement; - - /** Creates a special token */ - public Token(String token) { - this(token, null); - } - - /** Creates a special token which will be represented by the given replacement token */ - public Token(String token, String replacement) { - this.token = toLowerCase(token); - if (replacement == null || replacement.trim().equals("")) - this.replacement = this.token; - else - this.replacement = toLowerCase(replacement); - } - - /** Returns the special token */ - public String token() { return token; } - - /** Returns the token to replace occurrences of this by, which equals token() unless this has a replacement. */ - public String replacement() { return replacement; } - - @Override - public int compareTo(Token other) { - if (this.token().length() < other.token().length()) return 1; - if (this.token().length() == other.token().length()) return 0; - return -1; - } - - @Override - public boolean equals(Object other) { - if (other == this) return true; - if ( ! (other instanceof Token)) return false; - return Objects.equals(this.token, ((Token)other).token); - } - - @Override - public int hashCode() { return token.hashCode(); } - - @Override - public String toString() { - return "token '" + token + "'" + (replacement.equals(token) ? "" : " replacement '" + replacement + "'"); - } - - private void validate() { - // XXX not fool proof length test, should test codepoint by codepoint for mixed case user input? not even that will necessarily be 100% robust... - String asLow = toLowerCase(token); - // TODO: Put along with the global toLowerCase - String asHigh = token.toUpperCase(Locale.ENGLISH); - if (asLow.length() != token.length() || asHigh.length() != token.length()) { - throw new IllegalArgumentException("Special token '" + token + "' has case sensitive length. " + - "Please report this to the Vespa team."); - } - } - - } - -} |