/// <summary>
/// Initializes a new instance of the <see cref="Rule"/> class.
/// </summary>
/// <param name="name">The name of the grammar rule.</param>
/// <param name="ast">The AST of the rule.</param>
/// <param name="publicApi">True, if the rule should be part of public API.</param>
public Rule(string name, BnfAst ast, bool publicApi = true)
{
this.Name = name;
this.Ast = ast;
this.PublicApi = publicApi;
this.VisualName = name;
}
/// <inheritdoc/> protected override BnfAst SubstituteByReferenceImpl(BnfAst find, BnfAst replaceWith) => this;
/// <inheritdoc/> protected override BnfAst SubstituteByReferenceImpl(BnfAst find, BnfAst replaceWith) => new Seq(this.Elements.Select(e => e.SubstituteByReference(find, replaceWith)));
/// <summary>
/// Initializes a new instance of the <see cref="Seq"/> class.
/// </summary>
/// <param name="first">The first subexpression to match.</param>
/// <param name="second">The subexpression to match after <paramref name="first"/>.</param>
public Seq(BnfAst first, BnfAst second)
{
this.Elements = new BnfAst[] { first, second };
}
/// <summary>
/// Initializes a new instance of the <see cref="Placeholder"/> class.
/// </summary>
/// <param name="reference">The referenced AST.</param>
public Placeholder(BnfAst reference)
{
this.Reference = reference;
}
/// <inheritdoc/> protected override BnfAst SubstituteByReferenceImpl(BnfAst find, BnfAst replaceWith) => new Rep0(this.Subexpr.SubstituteByReference(find, replaceWith));
/// <summary>
/// Initializes a new instance of the <see cref="Rep0"/> class.
/// </summary>
/// <param name="subexpr">The subexpression that can be repeated 0 or more times.</param>
public Rep0(BnfAst subexpr)
{
this.Subexpr = subexpr;
}
/// <summary>
/// Initializes a new instance of the <see cref="Opt"/> class.
/// </summary>
/// <param name="subexpr">The optional subexpression.</param>
public Opt(BnfAst subexpr)
{
this.Subexpr = subexpr;
}
/// <summary> /// Implements <see cref="SubstituteByReference(BnfAst, BnfAst)"/>, when this instance is not equal to /// <paramref name="replaceWith"/>. /// </summary> /// <param name="find">The node to substitute.</param> /// <param name="replaceWith">The node to substituite <paramref name="find"/> for.</param> /// <returns>A node that has all <paramref name="find"/> nodes substituted to /// <paramref name="replaceWith"/>, by reference.</returns> protected abstract BnfAst SubstituteByReferenceImpl(BnfAst find, BnfAst replaceWith);
/// <summary>
/// Substitutes a node by reference.
/// </summary>
/// <param name="find">The node to substitute.</param>
/// <param name="replaceWith">The node to substituite <paramref name="find"/> for.</param>
/// <returns>A node that has all <paramref name="find"/> nodes substituted to
/// <paramref name="replaceWith"/>, by reference.</returns>
public BnfAst SubstituteByReference(BnfAst find, BnfAst replaceWith) => ReferenceEquals(this, find)
? replaceWith
: this.SubstituteByReferenceImpl(find, replaceWith);
/// <inheritdoc/>
protected override BnfAst SubstituteByReferenceImpl(BnfAst find, BnfAst replaceWith) => new FoldLeft(
this.First.SubstituteByReference(find, replaceWith),
this.Second.SubstituteByReference(find, replaceWith));
/// <summary>
/// Initializes a new instance of the <see cref="FoldLeft"/> class.
/// </summary>
/// <param name="first">The first element of the fold.</param>
/// <param name="second">The second elements of the fold, that will be repeated.</param>
public FoldLeft(BnfAst first, BnfAst second)
{
this.First = first;
this.Second = second;
}
/// <summary>
/// Initializes a new instance of the <see cref="Group"/> class.
/// </summary>
/// <param name="subexpr">The grouped subexpression.</param>
public Group(BnfAst subexpr)
{
this.Subexpr = subexpr;
}
/// <inheritdoc/> protected override BnfAst SubstituteByReferenceImpl(BnfAst find, BnfAst replaceWith) => new Transform(this.Subexpr.SubstituteByReference(find, replaceWith), this.Method);
/// <summary>
/// Initializes a new instance of the <see cref="Transform"/> class.
/// </summary>
/// <param name="subexpr">The subexpression to match.</param>
/// <param name="method">The method to transform the result with.</param>
public Transform(BnfAst subexpr, IMethodSymbol method)
{
this.Subexpr = subexpr;
this.Method = method;
}