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com.github.mustachejava.codes.ValueCode Maven / Gradle / Ivy
package com.github.mustachejava.codes;
import com.github.mustachejava.DefaultMustacheFactory;
import com.github.mustachejava.FragmentKey;
import com.github.mustachejava.MustacheException;
import com.github.mustachejava.TemplateContext;
import com.github.mustachejava.util.LatchedWriter;
import com.github.mustachejava.util.Node;
import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.function.Function;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import static com.github.mustachejava.MustacheParser.DEFAULT_EM;
import static com.github.mustachejava.MustacheParser.DEFAULT_SM;
import static com.github.mustachejava.util.NodeValue.value;
/**
* Output a value
*/
public class ValueCode extends DefaultCode {
private final boolean encoded;
private final ExecutorService les;
@Override
public void identity(Writer writer) {
try {
if (name != null) {
writer.write(tc.startChars());
if (!encoded) {
writer.write("{");
}
writer.write(type);
writer.write(name);
if (!encoded) {
writer.write("}");
}
writer.write(tc.endChars());
}
appendText(writer);
} catch (IOException e) {
throw new MustacheException(e, tc);
}
}
public ValueCode(TemplateContext tc, DefaultMustacheFactory df, String variable, boolean encoded) {
super(tc, df, null, variable, "");
this.encoded = encoded;
les = df.getExecutorService();
}
@Override
public Writer execute(Writer writer, final List scopes) {
try {
final Object object = get(scopes);
if (object != null) {
if (object instanceof Function) {
handleFunction(writer, (Function) object, scopes);
} else if (object instanceof Callable) {
return handleCallable(writer, (Callable) object, scopes);
} else {
execute(writer, oh.stringify(object));
}
}
return super.execute(writer, scopes);
} catch (Exception e) {
throw new MustacheException("Failed to get value for " + name, e, tc);
}
}
protected Writer handleCallable(Writer writer, final Callable callable, final List scopes) throws Exception {
if (les == null) {
Object call = callable.call();
execute(writer, call == null ? null : oh.stringify(call));
return super.execute(writer, scopes);
} else {
// Flush the current writer
try {
writer.flush();
} catch (IOException e) {
throw new MustacheException("Failed to flush writer", e, tc);
}
final LatchedWriter latchedWriter = new LatchedWriter(writer);
final Writer finalWriter = writer;
les.execute(() -> {
try {
Object call = callable.call();
execute(finalWriter, call == null ? null : oh.stringify(call));
latchedWriter.done();
} catch (Throwable e) {
latchedWriter.failed(e);
}
});
return super.execute(latchedWriter, scopes);
}
}
@SuppressWarnings("unchecked")
protected void handleFunction(Writer writer, Function function, List scopes) throws IOException {
String value;
Object newtemplate = function.apply(null);
if (newtemplate == null) {
value = "";
} else {
String templateText = newtemplate.toString();
StringWriter sw = new StringWriter();
TemplateContext newTC = new TemplateContext(DEFAULT_SM, DEFAULT_EM, tc.file(), tc.line(), tc.startOfLine());
df.getFragment(new FragmentKey(newTC, templateText)).execute(sw, scopes).close();
value = sw.toString();
}
execute(writer, value);
}
protected void execute(Writer writer, String value) throws IOException {
// Treat null values as the empty string
if (value != null) {
if (encoded) {
df.encode(value, writer);
} else {
writer.write(value);
}
}
}
private Pattern compiledAppended;
@Override
public Node invert(Node node, String text, AtomicInteger position) {
if (compiledAppended == null) {
if (appended == null) {
compiledAppended = Pattern.compile("$");
} else {
compiledAppended = Pattern.compile(appended);
}
}
int start = position.get();
Matcher matcher = compiledAppended.matcher(text);
if (matcher.find(position.get())) {
String value = text.substring(start, matcher.start());
position.set(matcher.start() + matcher.group(0).length());
node.put(name, value(value));
return node;
} else {
return null;
}
}
}
