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Rich text control for JavaFX
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/*
* Copyright (c) 2023, Gluon
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see unitList;
public UnitBuffer() {
this(List.of());
}
public UnitBuffer(Unit unit) {
this(List.of(unit));
}
public UnitBuffer(Collection units) {
unitList = new ArrayList<>(units);
}
/**
* Gets the exportable text of the unit buffer. It is useful for clipboard or
* serializing the document, but shouldn't be used internally to do Piece
* operations
* @return a string with the exportable text content
*/
public String getText() {
final StringBuilder sb = new StringBuilder();
unitList.forEach(unit -> sb.append(unit.getText()));
return sb.toString();
}
/**
* Gets the internal text of the unit buffer. For text units, matches the exportable text.
* For non-text units, this is used as an anchor point
* @return a string with the internal text representation
*/
public String getInternalText() {
final StringBuilder sb = new StringBuilder();
unitList.forEach(unit -> sb.append(unit.getInternalText()));
return sb.toString();
}
/**
* Gets the internal length of the unit buffer. Useful for Piece operations
* @return an integer value of the internal number of positions that the unit spans
*/
public int length() {
return getUnitList().stream().mapToInt(Unit::length).sum();
}
/**
* Adds a new unit to the buffer
* @param unit the unit that is added
*/
public void append(Unit unit) {
unitList.add(unit);
}
/**
* Adds a list of units to the buffer
* @param units a list of units to be added
*/
public void append(List units) {
unitList.addAll(units);
}
/**
* Inserts a Unit into the buffer after a given position within its
* internal length, splitting in two the unit found at that position,
* if needed
* @param unit the unit to insert into this buffer
* @param position the position within the buffer range
*/
public void insert(Unit unit, int position) {
if (unit == null) {
return;
}
if (position < 0 || position > length()) {
return;
}
int accum = 0;
List buffer = new ArrayList<>();
for (Unit u : unitList) {
buffer.add(u);
if (u.isEmpty()) continue;
if (accum <= position && position <= accum + u.length()) {
if (u instanceof TextUnit) {
buffer.remove(u);
String substring0 = u.getText().substring(0, position - accum);
if (substring0.length() > 0) {
buffer.add(new TextUnit(substring0));
}
buffer.add(unit);
String substring1 = u.getText().substring(position - accum);
if (substring1.length() > 0) {
buffer.add(new TextUnit(substring1));
}
} else {
buffer.add(unit);
}
accum += unit.length();
}
accum += u.length();
}
unitList.clear();
unitList.addAll(buffer);
}
/**
* Removes content from the buffer of a given range within its
* internal length, splitting in two the units found at the limits,
* if needed
* @param start the initial position of the range
* @param end the end position of the range
*/
public void remove(int start, int end) {
if (Math.min(start, end) < 0 || Math.max(start, end) > length()) {
return;
}
TextUnit unit = new TextUnit("\u2065");
insert(unit, Math.max(start, end));
insert(unit, Math.min(start, end));
unitList.subList(unitList.indexOf(unit), unitList.lastIndexOf(unit) + 1).clear();
}
/**
* Gives the list of units of this buffer
* @return the list of units
*/
public List getUnitList() {
return unitList;
}
/**
* Check if the buffer is empty or not
* @return true if the list of units is null or empty
*/
public boolean isEmpty() {
return unitList == null || unitList.isEmpty();
}
/**
* Finds the unit that contains a range of document coordinates.
* Convenience method to find the unit that a piece belongs to.
* @param start the initial value of the range
* @param end the end value of the range
* @return the unit that has this range or an empty TextUnit
*/
public Unit getUnitWithRange(int start, int end) {
int accum = 0;
for (Unit unit : unitList) {
if (unit.isEmpty()) continue;
if (accum <= start && end <= accum + unit.length()) {
return unit;
}
accum += unit.length();
}
return new TextUnit("");
}
@Override
public String toString() {
return "UnitBuffer{" + unitList + "}";
}
/**
* Utility method that parses an external text that might contain emoji unicode characters
* and returns a UnitBuffer
* @param text a string that might contain emoji unicode characters
* @return a UnitBuffer with a list of units.
*/
public static UnitBuffer convertTextToUnits(String text) {
List units = new ArrayList<>();
TextUtils.convertToStringAndEmojiObjects(text).stream()
.map(o -> {
if (o instanceof Emoji) {
return List.of(new EmojiUnit((Emoji) o));
} else {
return createTextAndBlockUnits((String) o);
}
})
.forEach(units::addAll);
return new UnitBuffer(units);
}
private static List createTextAndBlockUnits(String text) {
ArrayList units = new ArrayList<>();
Matcher matcher = BLOCK_PATTERN.matcher(text);
int previousEnd = 0;
while (matcher.find()) {
int matchStart = matcher.start();
int matchEnd = matcher.end();
if (matchStart > previousEnd) {
units.add(new TextUnit(text.substring(previousEnd, matchStart)));
}
units.add(new BlockUnit(new Block(matcher.group(1) + matcher.group(2).trim())));
previousEnd = matchEnd;
}
if (previousEnd <= text.length() - 1) {
units.add(new TextUnit(text.substring(previousEnd)));
}
return units;
}
}