Joseph Doherty
37 lines
1.9 KiB
C#
37 lines
1.9 KiB
C#
namespace ZB.MOM.WW.OtOpcUa.Core.Scripting;
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using System.Text.RegularExpressions;
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/// <summary>
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/// Classifies the trivial "mirror" VirtualTag script shape <c>return ctx.GetTag("X").Value;</c>,
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/// which can be evaluated by returning the dependency value directly — no Roslyn compilation.
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/// Narrow, exact pattern: any near-miss returns false and falls through to the Roslyn path.
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/// </summary>
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/// <remarks>
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/// Physically defined in the Core.Scripting.Abstractions assembly (Roslyn-free, so ControlPlane
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/// can reference it); the namespace is Core.Scripting to keep consumer using-directives unchanged.
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/// </remarks>
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public static partial class PassthroughScript
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{
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// ^ \s* return \s+ ctx . GetTag ( "X" ) . Value ; \s* $ (whitespace-tolerant around tokens)
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// Tag-name class [^"\\] excludes both the closing quote and backslash: a literal containing a
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// backslash escape (e.g. "a\\b" → runtime name a\b) won't match, so it correctly falls through
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// to Roslyn, which interprets the escape and resolves the actual dependency key.
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[GeneratedRegex(@"^\s*return\s+ctx\s*\.\s*GetTag\s*\(\s*""([^""\\]+)""\s*\)\s*\.\s*Value\s*;\s*$")]
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private static partial Regex MirrorRegex();
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/// <summary>True if <paramref name="source"/> is the mirror passthrough shape; outputs the referenced tag.</summary>
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/// <param name="source">The VirtualTag script source to classify.</param>
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/// <param name="tagRef">On success, the tag reference captured from the mirror shape; otherwise empty.</param>
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/// <returns><see langword="true"/> if the source is the mirror passthrough shape; otherwise <see langword="false"/>.</returns>
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public static bool TryMatch(string? source, out string tagRef)
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{
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tagRef = string.Empty;
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if (string.IsNullOrEmpty(source)) return false;
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var m = MirrorRegex().Match(source);
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if (!m.Success) return false;
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tagRef = m.Groups[1].Value;
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return true;
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}
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}
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