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package de.undercouch.citeproc.csl.internal.rendering;
import de.undercouch.citeproc.csl.CSLDate;
import de.undercouch.citeproc.csl.internal.RenderContext;
import de.undercouch.citeproc.csl.internal.Token;
import de.undercouch.citeproc.csl.internal.behavior.Affixes;
import de.undercouch.citeproc.csl.internal.locale.LDate;
import de.undercouch.citeproc.helper.NodeHelper;
import de.undercouch.citeproc.helper.time.AnyDateParser;
import org.apache.commons.lang3.ArrayUtils;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import java.time.temporal.ChronoField;
import java.time.temporal.TemporalAccessor;
import java.util.ArrayList;
import java.util.List;
/**
* A date element from a style file
* @author Michel Kraeemr
*/
public class SDate implements SRenderingElement {
private final static String[] NAMES = new String[] { "year", "month", "day" };
private final String variable;
private final String form;
private final String datePartsAttr;
private final List dateParts = new ArrayList<>();
private final Affixes affixes;
/**
* Creates the date element from an XML node
* @param node the XML node
*/
public SDate(Node node) {
variable = NodeHelper.getAttrValue(node, "variable");
if (variable == null || variable.isEmpty()) {
throw new IllegalStateException("Date element does not select a variable");
}
String form = NodeHelper.getAttrValue(node, "form");
if (!"text".equals(form) && !"numeric".equals(form)) {
form = null;
}
this.form = form;
if (this.form != null) {
String datePartsAttr = NodeHelper.getAttrValue(node, "date-parts");
if ("year-month-day".equals(datePartsAttr) ||
"year-month".equals(datePartsAttr) ||
"year".equals(datePartsAttr)) {
this.datePartsAttr = datePartsAttr;
} else {
this.datePartsAttr = "year-month-day";
}
} else {
this.datePartsAttr = null;
}
NodeList children = node.getChildNodes();
for (int i = 0; i < children.getLength(); ++i) {
Node c = children.item(i);
String nodeName = c.getNodeName();
if ("date-part".equals(nodeName)) {
dateParts.add(new SDatePart(c));
}
}
affixes = new Affixes(node);
}
@Override
public void render(RenderContext ctx) {
affixes.wrap(this::renderInternal).accept(ctx);
}
private void renderInternal(RenderContext ctx) {
// fetch date variable but don't notify listeners until we know
// if we need to render anything or not
CSLDate date = ctx.getDateVariable(variable, true);
if (date == null) {
// notify listeners that the variable was empty
ctx.getVariableListeners().forEach(v -> v.onFetchDateVariable(variable, null));
return;
}
int[][] dps = date.getDateParts();
String literal = date.getLiteral();
if (dps == null && date.getRaw() != null) {
try {
// try to parse raw date
TemporalAccessor ta = AnyDateParser.parse(date.getRaw(),
ctx.getLocale().getLang());
if (ta.isSupported(ChronoField.YEAR)) {
if (ta.isSupported(ChronoField.MONTH_OF_YEAR)) {
if (ta.isSupported(ChronoField.DAY_OF_MONTH)) {
dps = new int[][] {{
ta.get(ChronoField.YEAR),
ta.get(ChronoField.MONTH_OF_YEAR),
ta.get(ChronoField.DAY_OF_MONTH)
}};
} else {
dps = new int[][] {{
ta.get(ChronoField.YEAR),
ta.get(ChronoField.MONTH_OF_YEAR)
}};
}
} else {
dps = new int[][] {{
ta.get(ChronoField.YEAR)
}};
}
}
} catch (IllegalArgumentException e) {
if (literal == null) {
literal = date.getRaw();
}
}
}
boolean notifyListenersEmpty = true;
if (dps != null && dps.length > 0) {
int[] first = dps[0];
int[] last = dps[dps.length - 1];
if (first.length != last.length) {
throw new IllegalStateException("Elements in date range must " +
"have the same length");
}
// Perform an algorithm that merges dates in date ranges. For
// example, the dates [2019-12-14, 2019-12-24] will be merged to
// "14-24 December 2019", [2019-01-01, 2019-12-31] will be merged
// to "01 January-31 December 2019", and [2018-01-01, 2019-12-31]
// will be merged to "01 January 2018-31 December 2019". This
// algorithm also works if the date to render is not a range.
RenderContext left = new RenderContext(ctx);
RenderContext right = new RenderContext(ctx);
RenderContext result = new RenderContext(ctx);
List dateParts;
if (form != null && ctx.getLocale().getDateFormats() != null) {
dateParts = new ArrayList<>();
LDate d = ctx.getLocale().getDateFormats().get(form);
if (d != null) {
for (SDatePart datePart : d.getDateParts()) {
if ("year".equals(datePart.getName())) {
dateParts.add(datePart);
} else if ("month".equals(datePart.getName()) &&
("year-month-day".equals(datePartsAttr) ||
"year-month".equals(datePartsAttr))) {
dateParts.add(datePart);
} else if ("day".equals(datePart.getName()) &&
"year-month-day".equals(datePartsAttr)) {
dateParts.add(datePart);
}
}
}
} else {
dateParts = this.dateParts;
}
for (SDatePart dp : dateParts) {
// determine which part to render
int len = ArrayUtils.indexOf(NAMES, dp.getName());
// merge if there are more, less significant parts
boolean shouldMerge = first.length > len;
// but do not merge if the more significant parts differ
// from each other, because in this case, we would have to
// merge at their position
if (shouldMerge) {
for (int i = 0; i <= len; ++i) {
if (first[i] != last[i]) {
shouldMerge = false;
break;
}
}
}
if (shouldMerge) {
// merge by appending left and right to the result
merge(left, right, result);
// reset left and right
left = new RenderContext(ctx);
right = new RenderContext(ctx);
// render the current part
dp.setDate(first);
dp.render(result);
} else {
// push first and last date to buffers until we merge them
dp.setDate(first);
dp.render(left);
dp.setDate(last);
dp.render(right);
}
}
// merge anything that is left
merge(left, right, result);
// emit the final result
notifyListenersEmpty = result.getResult().isEmpty();
ctx.emit(result.getResult());
} else if (literal != null) {
notifyListenersEmpty = literal.isEmpty();
ctx.emit(literal);
}
if (notifyListenersEmpty) {
// notify listeners that we did not render anything
ctx.getVariableListeners().forEach(v -> v.onFetchDateVariable(variable, null));
} else {
// notify listeners that we actually rendered something
ctx.getVariableListeners().forEach(v -> v.onFetchDateVariable(variable, date));
}
}
/**
* Merge two token buffers by appending them to a result buffer with
* an en-dash as separator
* @param left a render context holding the first token buffer
* @param right a render context holding the second token buffer
* @param result a render context holding the result buffer
*/
private void merge(RenderContext left, RenderContext right, RenderContext result) {
if (!left.getResult().isEmpty() && !right.getResult().isEmpty()) {
// append all tokens from the first buffer to the result but trim
// the last suffix
List leftTokens = left.getResult().getTokens();
for (int i = 0; i < leftTokens.size(); ++i) {
Token t = leftTokens.get(i);
if (i < leftTokens.size() - 1 || t.getType() != Token.Type.SUFFIX) {
result.emit(t);
}
}
// render en-dash
result.emit("\u2013");
// append all tokens from the second buffer to the result but trim
// the first prefix
List rightTokens = right.getResult().getTokens();
for (int i = 0; i < rightTokens.size(); ++i) {
Token t = rightTokens.get(i);
if (i > 0 || t.getType() != Token.Type.PREFIX) {
result.emit(t);
}
}
} else if (!left.getResult().isEmpty()) {
// second buffer is empty. only render the first one.
result.emit(left.getResult());
} else if (!right.getResult().isEmpty()) {
// first buffer is empty. only render the second one.
result.emit(right.getResult());
}
}
}
