/// <summary>
/// Compiles a lambda expression to JavaScript code.
/// </summary>
/// <param name="expr">Expression to compile to JavaScript.</param>
/// <param name="options">
/// Conversion options:
/// whether to include only the body of the lambda,
/// whether to use a single scope parameter,
/// what extensions to use (i.e. StaticStringMethods, StaticMathMethods, or any other custom extensions).
/// </param>
/// <returns>JavaScript code represented as a string.</returns>
public static string CompileToJavascript([NotNull] this LambdaExpression expr, JavascriptCompilationOptions options = null)
{
if (expr == null)
{
throw new ArgumentNullException(nameof(expr));
}
options = options ?? JavascriptCompilationOptions.DefaultOptions;
if (options.ScopeParameter && expr.Parameters.Count != 1)
{
throw new InvalidOperationException("When using ScopeParameter flag, the lambda expression must have one single argument.");
}
var visitor =
new JavascriptCompilerExpressionVisitor(
options.ScopeParameter ? expr.Parameters.Single() : null,
options.Extensions,
options);
visitor.Visit(options.BodyOnly || options.ScopeParameter ? expr.Body : expr);
if (options.BodyOnly || !options.ScopeParameter || visitor.UsedScopeMembers == null)
{
return(visitor.Result);
}
return($"function({string.Join(",", visitor.UsedScopeMembers)}){{return {visitor.Result};}}");
}
/// <summary>
/// Compiles an expression to JavaScript code.
/// </summary>
/// <param name="expr">Expression to compile to JavaScript.</param>
/// <param name="options">
/// Conversion options:
/// What extensions to use (i.e. StaticStringMethods, StaticMathMethods, or any other custom extensions).
/// Options not supported by this overload of `CompileToJavascript`:
/// Include only the body of the lambda (supported only in the LambdaExpression overload of this method);
/// Use a single scope parameter (supported only in the LambdaExpression overload of this method).
/// </param>
/// <returns>JavaScript code represented as a string.</returns>
public static string CompileToJavascript([NotNull] this Expression expr, JavascriptCompilationOptions options = null)
{
if (expr == null)
{
throw new ArgumentNullException(nameof(expr));
}
options = options ?? JavascriptCompilationOptions.DefaultOptions;
var visitor =
new JavascriptCompilerExpressionVisitor(
null,
options.Extensions,
options);
visitor.Visit(expr);
return(visitor.Result);
}