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// Provenance: own design — shared run scripts (spec §3.4, §3.7 structural checks)
namespace Godosa.Core.Runs.Scripts;
public static class ScriptLoader
{
private sealed class State(IScriptSource source)
{
public IScriptSource Source { get; } = source;
public List<Instr> Code { get; } = [];
public List<ScriptError> Errors { get; } = [];
public Dictionary<string, (DefNode Def, string File, int Format)> Defs { get; } = new(StringComparer.Ordinal);
public List<string> Includes { get; } = [];
public List<string> Calls { get; } = [];
public List<SourceRef> Chain { get; } = [];
public HashSet<string> Checkpoints { get; } = new(StringComparer.Ordinal);
public List<HashSet<string>> Known { get; } = [];
public Dictionary<string, string> Vars { get; } = new(StringComparer.Ordinal);
public HashSet<string> Locked { get; } = new(StringComparer.Ordinal);
public int TryDepth { get; set; }
}
public static ScriptProgram Load(string entry, IScriptSource source, IReadOnlyDictionary<string, string> cmdVars)
{
var s = new State(source);
foreach (var (k, v) in cmdVars)
{
s.Vars[k] = v;
s.Locked.Add(k);
}
s.Known.Add([.. cmdVars.Keys]);
var text = source.Read(entry);
if (text == null)
{
s.Errors.Add(new ScriptError(new SourceRef(entry, 1), $"script not found: {entry}"));
return new ScriptProgram(entry, RunMode.Debug, null, s.Vars, s.Locked, s.Code, s.Errors);
}
var file = ScriptParser.Parse(entry, text);
s.Errors.AddRange(file.Errors);
if (file.Mode == null)
s.Errors.Add(new ScriptError(new SourceRef(entry, 1), "top-level file needs 'mode'"));
LoadVarFiles(s, file);
s.Includes.Add(entry);
for (var i = 0; i < file.Body.Count; i++)
{
if (file.Body[i] is BlockNode { Kind: BlockKind.Setup } setup && i > 0)
s.Errors.Add(new ScriptError(setup.At, "setup must be the first block"));
}
Emit(s, file.Body, entry, file.Format, top: true);
return new ScriptProgram(entry, file.Mode ?? RunMode.Debug, file.Seed, s.Vars, s.Locked, s.Code, s.Errors);
}
private static void LoadVarFiles(State s, ScriptFile file)
{
foreach (var raw in file.VarFiles)
{
string path;
try
{
path = ScriptPaths.Resolve(file.Path, VarExpander.Expand(raw, n => s.Vars.GetValueOrDefault(n), null));
}
catch (ScriptFault e)
{
s.Errors.Add(new ScriptError(new SourceRef(file.Path, 1), e.Message));
continue;
}
if (s.Source.Read(path) is not { } text)
{
s.Errors.Add(new ScriptError(new SourceRef(file.Path, 1), $"vars file not found: {path}"));
continue;
}
var (values, errors) = VarsFile.Parse(path, text);
s.Errors.AddRange(errors);
foreach (var (k, v) in values)
{
if (!s.Locked.Contains(k))
s.Vars[k] = v;
s.Known[0].Add(k);
}
}
}
private static void Emit(State s, IReadOnlyList<Node> nodes, string file, int format, bool top)
{
foreach (var node in nodes)
{
Instr I(Op op) => new(op, node.At, node.Text, [.. s.Chain], format);
switch (node)
{
case VerbNode v:
CheckVars(s, v.At, v.Args);
s.Code.Add(I(Op.Verb) with { A = v.Verb, B = v.Args });
break;
case WaitNode w:
CheckVars(s, w.At, w.Condition);
s.Code.Add(I(Op.Wait) with { A = w.Condition, Timeout = w.Timeout });
break;
case ExpectNode e:
CheckVars(s, e.At, e.Condition);
s.Code.Add(I(Op.Expect) with { A = e.Condition });
break;
case SetNode set:
CheckVars(s, set.At, set.Value);
if (s.Locked.Contains(set.Name))
s.Errors.Add(new ScriptError(set.At, $"variable {set.Name} is set on the command line"));
s.Known[^1].Add(set.Name);
if (s.Calls.Count == 0)
s.Known[0].Add(set.Name);
s.Code.Add(I(Op.Set) with { A = set.Name, B = set.Value });
break;
case CheckpointNode cp:
if (s.TryDepth > 0)
s.Errors.Add(new ScriptError(cp.At, "checkpoint inside try"));
if (!s.Checkpoints.Add(cp.Name))
s.Errors.Add(new ScriptError(cp.At, $"duplicate checkpoint {cp.Name}"));
s.Code.Add(I(Op.Checkpoint) with { A = cp.Name });
break;
case BlockNode { Kind: BlockKind.Setup } b:
if (!top)
s.Errors.Add(new ScriptError(b.At, "setup only in the top-level file"));
s.Code.Add(I(Op.SetupBegin));
Emit(s, b.Body, file, format, false);
s.Code.Add(I(Op.SetupEnd));
break;
case BlockNode { Kind: BlockKind.Step } b:
s.Code.Add(I(Op.LabelBegin) with { A = b.Label! });
Emit(s, b.Body, file, format, false);
s.Code.Add(I(Op.LabelEnd) with { A = b.Label! });
break;
case BlockNode { Kind: BlockKind.Try } b:
var begin = s.Code.Count;
s.Code.Add(I(Op.TryBegin));
s.TryDepth++;
Emit(s, b.Body, file, format, false);
s.TryDepth--;
s.Code[begin] = s.Code[begin] with { Jump = s.Code.Count };
s.Code.Add(I(Op.TryEnd));
break;
case DefNode d:
if (!s.Defs.TryAdd(d.Name, (d, file, format)))
s.Errors.Add(new ScriptError(d.At, $"def {d.Name} already defined"));
break;
case CallNode c:
Call(s, c, format);
break;
case IncludeNode inc:
Include(s, inc);
break;
}
}
}
private static void Call(State s, CallNode c, int format)
{
foreach (var arg in c.Args)
CheckVars(s, c.At, arg);
if (!s.Defs.TryGetValue(c.Name, out var def))
{
s.Errors.Add(new ScriptError(c.At, $"unknown def {c.Name}"));
return;
}
if (def.Def.Params.Count != c.Args.Count)
{
s.Errors.Add(new ScriptError(c.At, $"def {c.Name} takes {def.Def.Params.Count} arguments, got {c.Args.Count}"));
return;
}
if (s.Calls.Contains(c.Name))
{
s.Errors.Add(new ScriptError(c.At, $"recursive call {c.Name}"));
return;
}
var bindings = def.Def.Params.Zip(c.Args, (p, a) => new KeyValuePair<string, string>(p, a)).ToList();
s.Code.Add(new Instr(Op.ScopeBegin, c.At, c.Text, [.. s.Chain], format) { Bindings = bindings, LocalVars = true });
s.Calls.Add(c.Name);
s.Chain.Add(c.At);
s.Known.Add([.. def.Def.Params]);
Emit(s, def.Def.Body, def.File, def.Format, false);
s.Known.RemoveAt(s.Known.Count - 1);
s.Chain.RemoveAt(s.Chain.Count - 1);
s.Calls.RemoveAt(s.Calls.Count - 1);
s.Code.Add(new Instr(Op.ScopeEnd, c.At, c.Text, [.. s.Chain], format));
}
private static void Include(State s, IncludeNode inc)
{
var path = ScriptPaths.Resolve(inc.At.File, inc.Path);
if (s.Includes.Contains(path))
{
s.Errors.Add(new ScriptError(inc.At, $"include cycle: {string.Join(" → ", s.Includes)} → {path}"));
return;
}
if (s.Source.Read(path) is not { } text)
{
s.Errors.Add(new ScriptError(inc.At, $"include not found: {path}"));
return;
}
var file = ScriptParser.Parse(path, text);
s.Errors.AddRange(file.Errors);
if (file.Mode != null)
s.Errors.Add(new ScriptError(new SourceRef(path, 2), "mode only in the top-level file"));
LoadVarFiles(s, file);
s.Code.Add(new Instr(Op.ScopeBegin, inc.At, inc.Text, [.. s.Chain], file.Format));
s.Includes.Add(path);
s.Chain.Add(inc.At);
Emit(s, file.Body, path, file.Format, false);
s.Chain.RemoveAt(s.Chain.Count - 1);
s.Includes.RemoveAt(s.Includes.Count - 1);
s.Code.Add(new Instr(Op.ScopeEnd, inc.At, inc.Text, [.. s.Chain], file.Format));
}
private static void CheckVars(State s, SourceRef at, string text)
{
foreach (var name in VarExpander.Names(text))
{
if (!s.Known.Any(k => k.Contains(name)))
s.Errors.Add(new ScriptError(at, $"unresolved variable ${{{name}}}"));
}
}
}
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