// 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 RmdFrontMatterOutputOptions transferOptions(
RmdFrontMatter frontMatter, RmdTemplate template, String format) {
RmdFrontMatterOutputOptions result = RmdFrontMatterOutputOptions.create();
// loop over each option applicable to the new format; if it's
// transferable, try to find it in one of the other formats
JsArrayString options = template.getFormat(format).getOptions();
for (int i = 0; i < options.length(); i++) {
String optionName = options.get(i);
RmdTemplateFormatOption option = template.getOption(optionName);
if (!option.isTransferable()) continue;
// option is transferable, is it present in another front matter entry?
JsArrayString formats = frontMatter.getFormatList();
for (int j = 0; j < formats.length(); j++) {
RmdFrontMatterOutputOptions outOptions = frontMatter.getOutputOption(formats.get(j));
if (outOptions == null) continue;
String val = outOptions.getOptionValue(optionName);
if (val != null) result.setOptionValue(option, val);
}
}
return result;
}