public static string Parse(string markdown, Func <string, string> variableEvaluator = null, bool requireCodeBlocks = true)
{
var lines = markdown.Split(new[] { "\r\n", "\r", "\n" }, StringSplitOptions.None);
// parse and merge code blocks into single syntax tree
var mergedYaml = new YamlMappingNode();
bool foundCodeBlock = false;
for (int i = 0; i < lines.Length; i++)
{
CodeFence fenceOpen = TryParseCodeFence(lines[i]);
CodeFence fenceClose;
// get code block
if (fenceOpen != null)
{
foundCodeBlock = true;
var codeBlock = new StringBuilder();
// parse code block
i++;
while (i < lines.Length &&
((fenceClose = TryParseCodeFence(lines[i])) == null || !IsCodeFencePair(fenceOpen, fenceClose)))
{
codeBlock.AppendLine(lines[i]);
i++;
}
// deserialize and merge
var guard = Regex.Match(fenceOpen.InfoString.ResolveVariables(variableEvaluator), @"enabled=(?<guard>\S+)").Groups["guard"]; // TODO: logical ops?
var active = !guard.Success || guard.Value == "true"; // TODO: that all? TRUE? 1? wat?
if (active)
{
// deserialize and merge
var codeBlockYaml = codeBlock.ToString().ResolveVariables(variableEvaluator).ParseYaml() as YamlMappingNode;
if (codeBlockYaml == null)
{
throw new FormatException("A given code block was not a valid YAML object.");
}
mergedYaml = mergedYaml.MergeWith(codeBlockYaml);
}
}
}
if (requireCodeBlocks && !foundCodeBlock)
{
throw new FormatException("Require at least one code block in provided markdown.");
}
// return resulting YAML
return(mergedYaml.Serialize());
}
private static bool IsCodeFencePair(CodeFence open, CodeFence close) => open.Fence.Length <= close.Fence.Length && open.Fence[0] == close.Fence[0];