private Engine SetupEngine(IResourceFileReader resourceCollection, ResourceInfo scriptResource, DocumentBuildContext context)
{
var rootPath = (RelativePath)scriptResource.Path;
var engineCache = new Dictionary <string, Engine>();
var utility = new TemplateUtility(context);
_utilityObject = new
{
resolveSourceRelativePath = new Func <string, string, string>(utility.ResolveSourceRelativePath),
getHrefFromRoot = new Func <string, string, string>(utility.GetHrefFromRoot),
markup = new Func <string, string, string>(utility.Markup),
};
var engine = CreateDefaultEngine();
var requireAction = new Func <string, object>(
s =>
{
if (!s.StartsWith(RequireRelativePathPrefix, StringComparison.Ordinal))
{
throw new ArgumentException($"Only relative path starting with `{RequireRelativePathPrefix}` is supported in require");
}
var relativePath = (RelativePath)s.Substring(RequireRelativePathPrefix.Length);
s = relativePath.BasedOn(rootPath);
var script = resourceCollection?.GetResource(s);
if (string.IsNullOrWhiteSpace(script))
{
return(null);
}
if (!engineCache.TryGetValue(s, out Engine cachedEngine))
{
cachedEngine = CreateEngine(engine, RequireFuncVariableName);
engineCache[s] = cachedEngine;
cachedEngine.Execute(script, new ParserOptions {
Source = s
});
}
return(cachedEngine.GetValue(ExportsVariableName));
});
engine.SetValue(RequireFuncVariableName, requireAction);
engineCache[rootPath] = engine;
engine.Execute(scriptResource.Content);
var value = engine.GetValue(ExportsVariableName);
if (value.IsObject())
{
var exports = value.AsObject();
_getOptionsFunc = GetFunc(GetOptionsFuncVariableName, exports);
_transformFunc = GetFunc(TransformFuncVariableName, exports);
}
else
{
throw new InvalidPreprocessorException("Invalid 'exports' variable definition. 'exports' MUST be an object.");
}
return(engine);
}
