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package org.fxmisc.richtext.model;
import java.util.Optional;
import java.util.function.BiFunction;
import org.reactfx.util.Either;
/**
* Defines the operations which are supported on a specific segment type.
*
* @param The segment type
* @param The style type for the segment
*/
public interface SegmentOps {
public int length(SEG seg);
public char charAt(SEG seg, int index);
public String getText(SEG seg);
public SEG subSequence(SEG seg, int start, int end);
public SEG subSequence(SEG seg, int start);
/**
* Joins two consecutive segments together into one or {@link Optional#empty()} if they cannot be joined.
*/
public Optional joinSeg(SEG currentSeg, SEG nextSeg);
/**
* Joins two consecutive styles together into one or {@link Optional#empty()} if they cannot be joined. By default,
* returns {@link Optional#empty()}.
*/
default Optional joinStyle(S currentStyle, S nextStyle) {
return Optional.empty();
}
/**
* Creates an empty segment. This method should return the same object for better performance and memory usage.
*/
public SEG createEmptySeg();
/**
* Creates a {@link TextOps} specified for a {@link String} segment that never merges consecutive styles
*/
public static TextOps styledTextOps() {
return styledTextOps((s1, s2) -> Optional.empty());
}
/**
* Creates a {@link TextOps} specified for a {@link String}
*/
public static TextOps styledTextOps(BiFunction> mergeStyle) {
return new TextOpsBase("") {
@Override
public char realCharAt(String s, int index) {
return s.charAt(index);
}
@Override
public String realGetText(String s) {
return s;
}
@Override
public String realSubSequence(String s, int start, int end) {
return s.substring(start, end);
}
@Override
public String create(String text) {
return text;
}
@Override
public int length(String s) {
return s.length();
}
@Override
public Optional joinSeg(String currentSeg, String nextSeg) {
return Optional.of(currentSeg + nextSeg);
}
@Override
public Optional joinStyle(S currentStyle, S nextStyle) {
return mergeStyle.apply(currentStyle, nextStyle);
}
};
}
/**
* Returns a {@link SegmentOps} that specifies its segment type to be an {@link Either}
* whose {@link Either#left(Object) left} value is this segment type and
* whose {@link Either#right(Object) right} value is {@code rOps}' segment type.
*/
public default SegmentOps, S> or(SegmentOps rOps) {
return either(this, rOps);
}
/**
* Returns a {@link SegmentOps}
* that specifies its segment type to be an {@link Either}
* whose {@link Either#left(Object) left} value is this segment type and
* whose {@link Either#right(Object) right} value is {@code rOps}' segment type, and
* that specifies its style type to be {@link Either}
* whose {@link Either#left(Object) left} value is this style type and
* whose {@link Either#right(Object) right} value is {@code rOps}' style type.
*/
public default SegmentOps, Either> orStyled(
SegmentOps rOps
) {
return eitherStyles(this, rOps);
}
/**
* Returns a {@link SegmentOps}
* that specifies its segment type to be an {@link Either}
* whose {@link Either#left(Object) left} value is {@code lOps}' segment type and
* whose {@link Either#right(Object) right} value is {@code rOps}' segment type, and
* that specifies its style type to be {@link Either}
* whose {@link Either#left(Object) left} value is {@code lOps}' style type and
* whose {@link Either#right(Object) right} value is {@code rOps}' style type.
*
* Note: consecutive styles will not be merged.
*/
public static SegmentOps, Either> eitherStyles(
SegmentOps lOps,
SegmentOps rOps) {
return new EitherStyledSegmentOps<>(lOps, rOps);
}
/**
* Returns a {@link SegmentOps} that specifies its segment type to be an {@link Either}
* whose {@link Either#left(Object) left} value is {@code lOps}' segment type and
* whose {@link Either#right(Object) right} value is {@code rOps}' segment type.
*
* Note: consecutive styles will not be merged.
*/
public static SegmentOps, Style> either(SegmentOps lOps,
SegmentOps rOps) {
return either(lOps, rOps, (leftStyle, rightStyle) -> Optional.empty());
}
/**
* Returns a {@link SegmentOps} that specifies its segment type to be an {@link Either}
* whose {@link Either#left(Object) left} value is {@code lOps}' segment type and
* whose {@link Either#right(Object) right} value is {@code rOps}' segment type.
*/
public static SegmentOps, Style> either(
SegmentOps lOps, SegmentOps rOps,
BiFunction> mergeStyle) {
return new EitherSegmentOps<>(lOps, rOps, mergeStyle);
}
}
class EitherSegmentOps implements SegmentOps, S> {
private final SegmentOps lOps;
private final SegmentOps rOps;
private final BiFunction> mergeStyle;
EitherSegmentOps(SegmentOps lOps, SegmentOps rOps, BiFunction> mergeStyle) {
this.lOps = lOps;
this.rOps = rOps;
this.mergeStyle = mergeStyle;
}
@Override
public int length(Either seg) {
return seg.unify(lOps::length, rOps::length);
}
@Override
public char charAt(Either seg, int index) {
return seg.unify(l -> lOps.charAt(l, index),
r -> rOps.charAt(r, index));
}
@Override
public String getText(Either seg) {
return seg.unify(lOps::getText, rOps::getText);
}
@Override
public Either subSequence(Either seg, int start, int end) {
return seg.map(l -> lOps.subSequence(l, start, end),
r -> rOps.subSequence(r, start, end));
}
@Override
public Either subSequence(Either seg, int start) {
return seg.map(l -> lOps.subSequence(l, start),
r -> rOps.subSequence(r, start));
}
@Override
public Optional> joinSeg(Either left, Either right) {
return left.unify(ll -> right.unify(rl -> lOps.joinSeg(ll, rl).map(Either::left), rr -> Optional.empty()),
lr -> right.unify(rl -> Optional.empty(), rr -> rOps.joinSeg(lr, rr).map(Either::right)));
}
@Override
public Optional joinStyle(S currentStyle, S nextStyle) {
return mergeStyle.apply(currentStyle, nextStyle);
}
public Either createEmptySeg() {
return Either.left(lOps.createEmptySeg());
}
}
class EitherStyledSegmentOps implements SegmentOps, Either> {
private final SegmentOps lOps;
private final SegmentOps rOps;
EitherStyledSegmentOps(SegmentOps lOps, SegmentOps rOps) {
this.lOps = lOps;
this.rOps = rOps;
}
@Override
public int length(Either seg) {
return seg.unify(
lOps::length,
rOps::length
);
}
@Override
public char charAt(Either seg, int index) {
return seg.unify(
lSeg -> lOps.charAt(lSeg, index),
rSeg -> rOps.charAt(rSeg, index)
);
}
@Override
public String getText(Either seg) {
return seg.unify(lOps::getText, rOps::getText);
}
@Override
public Either subSequence(Either seg, int start, int end) {
return seg.map(
lSeg -> lOps.subSequence(lSeg, start, end),
rSeg -> rOps.subSequence(rSeg, start, end)
);
}
@Override
public Either subSequence(Either seg, int start) {
return seg.map(lSeg -> lOps.subSequence(lSeg, start),
rSeg -> rOps.subSequence(rSeg, start));
}
@Override
public Optional> joinSeg(Either left, Either right) {
return left.unify(
ll -> right.unify(
rl -> lOps.joinSeg(ll, rl).map(Either::left),
rr -> Optional.empty()),
lr -> right.unify(
rl -> Optional.empty(),
rr -> rOps.joinSeg(lr, rr).map(Either::right))
);
}
@Override
public Optional> joinStyle(Either left, Either right) {
return left.unify(
ll -> right.unify(
rl -> lOps.joinStyle(ll, rl).map(Either::left),
rr -> Optional.empty()),
lr -> right.unify(
rl -> Optional.empty(),
rr -> rOps.joinStyle(lr, rr).map(Either::right))
);
}
public Either createEmptySeg() {
return Either.left(lOps.createEmptySeg());
}
}
