// Return the selected template and format given the YAML front matter
public RmdSelectedTemplate getTemplateFormat(String yaml) {
// This is in the editor load path, so guard against exceptions and log
// any we find without bringing down the editor. Failing to find a
// template here just turns off the template-specific UI format editor.
try {
YamlTree tree = new YamlTree(yaml);
boolean isShiny = false;
if (tree.getKeyValue(RmdFrontMatter.KNIT_KEY).length() > 0) return null;
// Find the template appropriate to the first output format listed.
// If no output format is present, assume HTML document (as the
// renderer does).
List<String> outFormats = getOutputFormats(tree);
String outFormat =
outFormats == null ? RmdOutputFormat.OUTPUT_HTML_DOCUMENT : outFormats.get(0);
RmdTemplate template = getTemplateForFormat(outFormat);
if (template == null) return null;
// If this format produces HTML and is marked as Shiny, treat it as
// a Shiny format
if (template.getFormat(outFormat).getExtension().equals("html")
&& tree.getKeyValue(RmdFrontMatter.RUNTIME_KEY).equals(RmdFrontMatter.SHINY_RUNTIME)) {
isShiny = true;
}
return new RmdSelectedTemplate(template, outFormat, isShiny);
} catch (Exception e) {
Debug.log("Warning: Exception thrown while parsing YAML:\n" + yaml);
}
return null;
}
private List<String> getOutputFormats(YamlTree tree) {
List<String> outputs = tree.getChildKeys(RmdFrontMatter.OUTPUT_KEY);
if (outputs == null) return null;
if (outputs.isEmpty()) outputs.add(tree.getKeyValue(RmdFrontMatter.OUTPUT_KEY));
return outputs;
}