refactor(scripting): extract script-callable types into Roslyn-free Core.Scripting.Abstractions (A0)

src/Core/ZB.MOM.WW.OtOpcUa.Core.ScriptedAlarms/AlarmPredicateContext.cs

@@ -1,68 +0,0 @@
-using Serilog;
-using ZB.MOM.WW.OtOpcUa.Core.Abstractions;
-using ZB.MOM.WW.OtOpcUa.Core.Scripting;
-
-namespace ZB.MOM.WW.OtOpcUa.Core.ScriptedAlarms;
-
-/// <summary>
-///     <see cref="ScriptContext"/> subclass for alarm predicate evaluation. Reads from
-///     the engine's shared tag cache (driver + virtual tags), writes are rejected —
-///     predicates must be side-effect free so their output doesn't depend on evaluation
-///     order or drive cascade behavior.
-/// </summary>
-/// <remarks>
-///     Per Phase 7 plan Shape A decision, alarm scripts are one-script-per-alarm
-///     returning <c>bool</c>. They read any tag they want but should not write
-///     anything (the owning alarm's state is tracked by the engine, not the script).
-/// </remarks>
-public sealed class AlarmPredicateContext : ScriptContext
-{
-    private readonly IReadOnlyDictionary<string, DataValueSnapshot> _readCache;
-    private readonly Func<DateTime> _clock;
-
-    /// <summary>Initializes a new instance of the <see cref="AlarmPredicateContext"/> class.</summary>
-    /// <param name="readCache">The cached read values from tags.</param>
-    /// <param name="logger">The logger for diagnostics.</param>
-    /// <param name="clock">Optional custom clock for testing.</param>
-    public AlarmPredicateContext(
-        IReadOnlyDictionary<string, DataValueSnapshot> readCache,
-        ILogger logger,
-        Func<DateTime>? clock = null)
-    {
-        _readCache = readCache ?? throw new ArgumentNullException(nameof(readCache));
-        Logger = logger ?? throw new ArgumentNullException(nameof(logger));
-        _clock = clock ?? (() => DateTime.UtcNow);
-    }
-
-    /// <summary>Gets a tag value from the read cache.</summary>
-    /// <param name="path">The tag path to retrieve.</param>
-    /// <inheritdoc />
-    public override DataValueSnapshot GetTag(string path)
-    {
-        if (string.IsNullOrWhiteSpace(path))
-            return new DataValueSnapshot(null, 0x80340000u, null, _clock());
-        return _readCache.TryGetValue(path, out var v)
-            ? v
-            : new DataValueSnapshot(null, 0x80340000u, null, _clock());
-    }
-
-    /// <summary>Rejects virtual tag writes for pure predicate semantics.</summary>
-    /// <param name="path">The virtual tag path.</param>
-    /// <param name="value">The value to write.</param>
-    /// <inheritdoc />
-    public override void SetVirtualTag(string path, object? value)
-    {
-        // Predicates must be pure — writing from an alarm script couples alarm state to
-        // virtual-tag state in a way that's near-impossible to reason about. Rejected
-        // at runtime with a clear message; operators see it in the scripts-*.log.
-        throw new InvalidOperationException(
-            "Alarm predicate scripts cannot write to virtual tags. Move the write logic " +
-            "into a virtual tag whose value the alarm predicate then reads.");
-    }
-
-    /// <inheritdoc />
-    public override DateTime Now => _clock();
-
-    /// <inheritdoc />
-    public override ILogger Logger { get; }
-}

src/Core/ZB.MOM.WW.OtOpcUa.Core.ScriptedAlarms/ZB.MOM.WW.OtOpcUa.Core.ScriptedAlarms.csproj

@@ -17,6 +17,7 @@
 
     <ItemGroup>
         <ProjectReference Include="..\ZB.MOM.WW.OtOpcUa.Core.Abstractions\ZB.MOM.WW.OtOpcUa.Core.Abstractions.csproj"/>
+        <ProjectReference Include="..\ZB.MOM.WW.OtOpcUa.Core.Scripting.Abstractions\ZB.MOM.WW.OtOpcUa.Core.Scripting.Abstractions.csproj"/>
         <ProjectReference Include="..\ZB.MOM.WW.OtOpcUa.Core.Scripting\ZB.MOM.WW.OtOpcUa.Core.Scripting.csproj"/>
     </ItemGroup>