/**
* Process text content by including non-expression content verbatim and escaping expression
* content.
*
* @param result the target node where results should be inserted
* @param textContent the text content being processed
*/
private void processText(Node result, String textContent) {
Document ownerDocument = result.getOwnerDocument();
int start = 0;
int current = 0;
while (current < textContent.length()) {
current = textContent.indexOf("${", current);
// No expressions, we're done
if (current < 0) {
break;
}
// An escaped expression "\${"
if (current > 0 && textContent.charAt(current - 1) == '\\') {
// Drop the \ by outputting everything before it, and moving past
// the ${
if (current - 1 > start) {
String staticText = textContent.substring(start, current - 1);
result.appendChild(ownerDocument.createTextNode(staticText));
}
start = current;
current = current + 2;
continue;
}
// Not a real expression, we're done
int expressionEnd = textContent.indexOf('}', current + 2);
if (expressionEnd < 0) {
break;
}
// Append the existing static text, if any
if (current > start) {
result.appendChild(ownerDocument.createTextNode(textContent.substring(start, current)));
}
// Isolate the expression, parse and evaluate
String expression = textContent.substring(current, expressionEnd + 1);
String value = evaluate(expression, String.class, "");
if (!"".equals(value)) {
// And now escape
outputBuffer.setLength(0);
try {
HtmlSerialization.printEscapedText(value, outputBuffer);
} catch (IOException e) {
// Can't happen writing to StringBuilder
throw new RuntimeException(e);
}
result.appendChild(ownerDocument.createTextNode(outputBuffer.toString()));
}
// And continue with the next expression
current = start = expressionEnd + 1;
}
// Add any static text left over
if (start < textContent.length()) {
result.appendChild(ownerDocument.createTextNode(textContent.substring(start)));
}
}