+++ /dev/null
-/*
- * This file is part of lanterna (http://code.google.com/p/lanterna/).
- *
- * lanterna is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- *
- * Copyright (C) 2010-2015 Martin
- */
-package com.googlecode.lanterna.input;
-
-import com.googlecode.lanterna.input.CharacterPattern.Matching;
-
-import java.io.BufferedReader;
-import java.io.IOException;
-import java.io.Reader;
-import java.util.*;
-
-/**
- * Used to read the input stream character by character and generate {@code Key} objects to be put in the input queue.
- *
- * @author Martin, Andreas
- */
-public class InputDecoder {
- private final Reader source;
- private final List<CharacterPattern> bytePatterns;
- private final List<Character> currentMatching;
- private boolean seenEOF;
- private int timeoutUnits;
-
- /**
- * Creates a new input decoder using a specified Reader as the source to read characters from
- * @param source Reader to read characters from, will be wrapped by a BufferedReader
- */
- public InputDecoder(final Reader source) {
- this.source = new BufferedReader(source);
- this.bytePatterns = new ArrayList<CharacterPattern>();
- this.currentMatching = new ArrayList<Character>();
- this.seenEOF = false;
- this.timeoutUnits = 0; // default is no wait at all
- }
-
- /**
- * Adds another key decoding profile to this InputDecoder, which means all patterns from the profile will be used
- * when decoding input.
- * @param profile Profile to add
- */
- public void addProfile(KeyDecodingProfile profile) {
- for (CharacterPattern pattern : profile.getPatterns()) {
- synchronized(bytePatterns) {
- //If an equivalent pattern already exists, remove it first
- bytePatterns.remove(pattern);
- bytePatterns.add(pattern);
- }
- }
- }
-
- /**
- * Returns a collection of all patterns registered in this InputDecoder.
- * @return Collection of patterns in the InputDecoder
- */
- public synchronized Collection<CharacterPattern> getPatterns() {
- synchronized(bytePatterns) {
- return new ArrayList<CharacterPattern>(bytePatterns);
- }
- }
-
- /**
- * Removes one pattern from the list of patterns in this InputDecoder
- * @param pattern Pattern to remove
- * @return {@code true} if the supplied pattern was found and was removed, otherwise {@code false}
- */
- public boolean removePattern(CharacterPattern pattern) {
- synchronized(bytePatterns) {
- return bytePatterns.remove(pattern);
- }
- }
-
- /**
- * Sets the number of 1/4-second units for how long to try to get further input
- * to complete an escape-sequence for a special Key.
- *
- * Negative numbers are mapped to 0 (no wait at all), and unreasonably high
- * values are mapped to a maximum of 240 (1 minute).
- */
- public void setTimeoutUnits(int units) {
- timeoutUnits = (units < 0) ? 0 :
- (units > 240) ? 240 :
- units;
- }
- /**
- * queries the current timeoutUnits value. One unit is 1/4 second.
- * @return The timeout this InputDecoder will use when waiting for additional input, in units of 1/4 seconds
- */
- public int getTimeoutUnits() {
- return timeoutUnits;
- }
-
- /**
- * Reads and decodes the next key stroke from the input stream
- * @return Key stroke read from the input stream, or {@code null} if none
- * @throws IOException If there was an I/O error when reading from the input stream
- */
- public synchronized KeyStroke getNextCharacter(boolean blockingIO) throws IOException {
-
- KeyStroke bestMatch = null;
- int bestLen = 0;
- int curLen = 0;
-
- while(true) {
-
- if ( curLen < currentMatching.size() ) {
- // (re-)consume characters previously read:
- curLen++;
- }
- else {
- // If we already have a bestMatch but a chance for a longer match
- // then we poll for the configured number of timeout units:
- // It would be much better, if we could just read with a timeout,
- // but lacking that, we wait 1/4s units and check for readiness.
- if (bestMatch != null) {
- int timeout = getTimeoutUnits();
- while (timeout > 0 && ! source.ready() ) {
- try {
- timeout--; Thread.sleep(250);
- } catch (InterruptedException e) { timeout = 0; }
- }
- }
- // if input is available, we can just read a char without waiting,
- // otherwise, for readInput() with no bestMatch found yet,
- // we have to wait blocking for more input:
- if ( source.ready() || ( blockingIO && bestMatch == null ) ) {
- int readChar = source.read();
- if (readChar == -1) {
- seenEOF = true;
- if(currentMatching.isEmpty()) {
- return new KeyStroke(KeyType.EOF);
- }
- break;
- }
- currentMatching.add( (char)readChar );
- curLen++;
- } else { // no more available input at this time.
- // already found something:
- if (bestMatch != null) {
- break; // it's something...
- }
- // otherwise: no KeyStroke yet
- return null;
- }
- }
-
- List<Character> curSub = currentMatching.subList(0, curLen);
- Matching matching = getBestMatch( curSub );
-
- // fullMatch found...
- if (matching.fullMatch != null) {
- bestMatch = matching.fullMatch;
- bestLen = curLen;
-
- if (! matching.partialMatch) {
- // that match and no more
- break;
- } else {
- // that match, but maybe more
- continue;
- }
- }
- // No match found yet, but there's still potential...
- else if ( matching.partialMatch ) {
- continue;
- }
- // no longer match possible at this point:
- else {
- if (bestMatch != null ) {
- // there was already a previous full-match, use it:
- break;
- } else { // invalid input!
- // remove the whole fail and re-try finding a KeyStroke...
- curSub.clear(); // or just 1 char? currentMatching.remove(0);
- curLen = 0;
- continue;
- }
- }
- }
-
- //Did we find anything? Otherwise return null
- if(bestMatch == null) {
- if(seenEOF) {
- currentMatching.clear();
- return new KeyStroke(KeyType.EOF);
- }
- return null;
- }
-
- List<Character> bestSub = currentMatching.subList(0, bestLen );
- bestSub.clear(); // remove matched characters from input
- return bestMatch;
- }
-
- private Matching getBestMatch(List<Character> characterSequence) {
- boolean partialMatch = false;
- KeyStroke bestMatch = null;
- synchronized(bytePatterns) {
- for(CharacterPattern pattern : bytePatterns) {
- Matching res = pattern.match(characterSequence);
- if (res != null) {
- if (res.partialMatch) { partialMatch = true; }
- if (res.fullMatch != null) { bestMatch = res.fullMatch; }
- }
- }
- }
- return new Matching(partialMatch, bestMatch);
- }
-}
git://git.nikiroo.be / jvcard.git / blobdiff