org.daisy.pipeline.braille.common.UnityBrailleTranslator Maven / Gradle / Ivy
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package org.daisy.pipeline.braille.common;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Pattern;
import cz.vutbr.web.css.CSSProperty;
import cz.vutbr.web.css.TermString;
import org.daisy.dotify.api.table.BrailleConverter;
import org.daisy.braille.css.SimpleInlineStyle;
import org.daisy.braille.css.BrailleCSSProperty.BrailleCharset;
import org.daisy.braille.css.BrailleCSSProperty.Hyphens;
import org.daisy.braille.css.BrailleCSSProperty.TextTransform;
import org.daisy.braille.css.BrailleCSSProperty.WhiteSpace;
import org.daisy.pipeline.braille.common.AbstractBrailleTranslator.util.DefaultLineBreaker;
import static org.daisy.pipeline.braille.common.util.Strings.splitInclDelimiter;
import org.daisy.pipeline.braille.css.CSSStyledText;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* {@link org.daisy.pipeline.braille.common.BrailleTranslator} that assumes input text exists of
* only braille and white space characters. Supports CSS properties "word-spacing", "hyphens",
* "hyphenate-character", "white-space", and "braille-charset".
*/
public class UnityBrailleTranslator extends AbstractBrailleTranslator implements BrailleTranslator {
private static final Pattern SPECIAL_CHARS = Pattern.compile("[\\x20\t\\n\\r\\u2800\\xA0\u00AD\u200B\u2028]+");
private final BrailleConverter brailleCharset;
private final boolean useBrailleCharsetForInput;
/**
* @param brailleCharset The character set of the output braille, and of the input in
* case it is styled as braille-charset: custom or if
* useBrailleCharsetForInput is true.
* null means Unicode braille.
* @param useBrailleCharsetForInput Whether brailleCharset by default also applies to
* the input (if it does not have a braille-charset
* style).
*/
public UnityBrailleTranslator(BrailleConverter brailleCharset, boolean useBrailleCharsetForInput) {
this.brailleCharset = brailleCharset;
this.useBrailleCharsetForInput = useBrailleCharsetForInput;
}
public UnityBrailleTranslator _withHyphenator(Hyphenator hyphenator) {
return this;
}
private FromStyledTextToBraille fromStyledTextToBraille = null;
public FromStyledTextToBraille fromStyledTextToBraille() {
if (fromStyledTextToBraille == null)
fromStyledTextToBraille = new FromStyledTextToBraille() {
public Iterable transform(Iterable input, int from, int to) {
List braille = new ArrayList<>(); {
int i = 0;
for (CSSStyledText styledText : input) {
if (i >= from && (to < 0 || i < to)) {
SimpleInlineStyle style = styledText.getStyle();
String text = styledText.getText();
boolean unicodeBraille = brailleCharset == null || !useBrailleCharsetForInput;
if (style != null) {
CSSProperty val = style.getProperty("hyphens");
if (val == Hyphens.MANUAL || val == Hyphens.NONE) {
if (val == Hyphens.NONE)
text = text.replaceAll("[\u00AD\u200B]","");
style.removeProperty("hyphens"); }
val = style.getProperty("white-space");
if (val != null)
style.removeProperty("white-space");
val = style.getProperty("text-transform");
if (val == TextTransform.NONE || val == TextTransform.AUTO)
style.removeProperty("text-transform");
val = style.getProperty("braille-charset");
if (val != null) {
if (val == BrailleCharset.CUSTOM)
unicodeBraille = false;
else if (val == BrailleCharset.UNICODE)
unicodeBraille = true;
style.removeProperty("braille-charset"); }
for (String prop : style.getPropertyNames()) {
logger.warn("'{}: {}' not supported in combination with 'text-transform: none'",
prop, style.get(prop));
logger.debug("(text was: '" + text + "')"); }}
if (unicodeBraille && brailleCharset != null) {
StringBuilder b; {
b = new StringBuilder();
boolean special = false;
for (String s : splitInclDelimiter(text, SPECIAL_CHARS)) {
if (!s.isEmpty())
b.append(special ? s : brailleCharset.toText(s));
special = !special;
}
}
braille.add(b.toString());
} else
braille.add(text);
}
i++;
}
}
return braille;
}
};
return fromStyledTextToBraille;
}
private LineBreakingFromStyledText lineBreakingFromStyledText = null;
public LineBreakingFromStyledText lineBreakingFromStyledText() {
if (lineBreakingFromStyledText == null) {
Character blankChar = brailleCharset == null
? '\u2800'
: brailleCharset.toText("\u2800").toCharArray()[0];
Character hyphenChar = brailleCharset == null
? '\u2824'
: brailleCharset.toText("\u2824").toCharArray()[0];
lineBreakingFromStyledText = new DefaultLineBreaker(blankChar, hyphenChar, brailleCharset, logger) {
protected BrailleStream translateAndHyphenate(java.lang.Iterable input, int from, int to) {
List braille = new ArrayList<>(); {
int i = 0;
for (CSSStyledText styledText : input) {
String text = styledText.getText();
if (i >= from && (to < 0 || i < to)) {
SimpleInlineStyle style = styledText.getStyle();
boolean unicodeBraille = brailleCharset == null || !useBrailleCharsetForInput;
if (style != null) {
CSSProperty val = style.getProperty("hyphens");
if (val == Hyphens.MANUAL || val == Hyphens.NONE) {
if (val == Hyphens.NONE)
text = text.replaceAll("[\u00AD\u200B]","");
style.removeProperty("hyphens"); }
val = style.getProperty("white-space");
if (val != null) {
if (val == WhiteSpace.PRE_WRAP)
text = text.replaceAll("[\\x20\t\\u2800]+", "$0\u200B") // ZERO WIDTH SPACE
.replaceAll("[\\x20\t\\u2800]", "\u00A0"); // NO-BREAK SPACE
if (val == WhiteSpace.PRE_WRAP || val == WhiteSpace.PRE_LINE)
text = text.replaceAll("[\\n\\r]", "\u2028"); // LINE SEPARATOR
style.removeProperty("white-space"); }
val = style.getProperty("text-transform");
if (val == TextTransform.NONE || val == TextTransform.AUTO)
style.removeProperty("text-transform");
val = style.getProperty("braille-charset");
if (val != null) {
if (val == BrailleCharset.CUSTOM)
unicodeBraille = false;
else if (val == BrailleCharset.UNICODE)
unicodeBraille = true;
style.removeProperty("braille-charset"); }
for (String prop : style.getPropertyNames()) {
logger.warn("'{}: {}' not supported in combination with 'text-transform: none'",
prop, style.get(prop));
logger.debug("(text was: '" + text + "')"); }}
if (unicodeBraille && brailleCharset != null) {
StringBuilder b; {
b = new StringBuilder();
boolean special = false;
for (String s : splitInclDelimiter(text, SPECIAL_CHARS)) {
if (!s.isEmpty())
b.append(special ? s : brailleCharset.toText(s));
special = !special;
}
}
text = b.toString();
}
} else {
// not converting to braille character set because not part of final output and we're not even
// sure that it is braille
// FIXME: may not even be useful to pass it as context to DefaultLineBreaker.LineIterator
}
braille.add(text);
i++;
}
}
StringBuilder joined = new StringBuilder();
int fromChar = 0;
int toChar = to >= 0 ? 0 : -1;
for (String s : braille) {
joined.append(s);
if (--from == 0)
fromChar = joined.length();
if (--to == 0)
toChar = joined.length();
}
return new FullyHyphenatedAndTranslatedString(joined.toString(), fromChar, toChar, hyphenChar);
}
};
}
return lineBreakingFromStyledText;
}
private static final Logger logger = LoggerFactory.getLogger(UnityBrailleTranslator.class);
}