1 files changed, 25 insertions, 0 deletions
diff --git a/src/Godosa.Core/Runs/Scripts/ScriptAst.cs b/src/Godosa.Core/Runs/Scripts/ScriptAst.cs
new file mode 100644
index 0000000..9fa2654
--- /dev/null
+++ b/src/Godosa.Core/Runs/Scripts/ScriptAst.cs
@@ -0,0 +1,25 @@
+// Provenance: own design — shared run scripts
+namespace Godosa.Core.Runs.Scripts;
+
+public enum BlockKind { Setup, Step, Try }
+
+/// <summary>One parsed line (or block header) of a <c>.steps</c> file; <see cref="Text"/> = the trimmed source line.</summary>
+public abstract record Node(SourceRef At, string Text);
+public sealed record VerbNode(SourceRef At, string Text, string Verb, string Args) : Node(At, Text);
+public sealed record WaitNode(SourceRef At, string Text, string Condition, int Timeout) : Node(At, Text);
+public sealed record ExpectNode(SourceRef At, string Text, string Condition) : Node(At, Text);
+public sealed record SetNode(SourceRef At, string Text, string Name, string Value) : Node(At, Text);
+public sealed record IncludeNode(SourceRef At, string Text, string Path) : Node(At, Text);
+public sealed record CallNode(SourceRef At, string Text, string Name, IReadOnlyList<string> Args) : Node(At, Text);
+public sealed record CheckpointNode(SourceRef At, string Text, string Name) : Node(At, Text);
+public sealed record BlockNode(SourceRef At, string Text, BlockKind Kind, string? Label, IReadOnlyList<Node> Body) : Node(At, Text);
+public sealed record DefNode(SourceRef At, string Text, string Name, IReadOnlyList<string> Params, IReadOnlyList<Node> Body) : Node(At, Text);
+
+public sealed record ScriptFile(string Path, int Format, RunMode? Mode, ulong? Seed, IReadOnlyList<string> VarFiles,
+    IReadOnlyList<Node> Body, IReadOnlyList<ScriptError> Errors);
+
+public static class ScriptFormat
+{
+    /// <summary>Newest format version this runner knows; every older one stays supported.</summary>
+    public const int Latest = 1;
+}