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// Provenance: own design — shared run scripts (spec §3.3)
using System.Text;
namespace Godosa.Core.Runs.Scripts;
public static class VarsFile
{
public static (Dictionary<string, string> Values, List<ScriptError> Errors) Parse(string path, string text)
{
var values = new Dictionary<string, string>(StringComparer.Ordinal);
var errors = new List<ScriptError>();
var lines = text.TrimStart('\uFEFF').Replace("\r\n", "\n").Split('\n');
for (var i = 0; i < lines.Length; i++)
{
var line = StepLexer.StripComment(lines[i]).Trim();
if (line.Length == 0)
continue;
var eq = line.IndexOf('=');
var name = eq > 0 ? line[..eq].Trim() : "";
if (name.Length == 0 || name.Contains(' '))
{
errors.Add(new ScriptError(new SourceRef(path, i + 1), "bad vars line (name = value)"));
continue;
}
values[name] = line[(eq + 1)..].Trim();
}
return (values, errors);
}
}
/// <summary><c>${name}</c> expansion, innermost first (<c>${ui.rest.${hours}}</c>); <c>${probe:name(args)}</c> = a probe
/// value; a <c>$</c> not followed by <c>{</c> is literal.</summary>
public static class VarExpander
{
public static string Expand(string text, Func<string, string?> lookup, Func<string, RunValue>? probe)
{
var sb = new StringBuilder();
var i = 0;
while (i < text.Length)
{
if (text[i] == '$' && i + 1 < text.Length && text[i + 1] == '{')
{
i += 2;
sb.Append(Reference(text, ref i, lookup, probe));
continue;
}
sb.Append(text[i++]);
}
return sb.ToString();
}
/// <summary>Resolves the reference opened before <paramref name="i"/> (nested references in its name first); the
/// value is used as is, never scanned again.</summary>
private static string Reference(string text, ref int i, Func<string, string?> lookup, Func<string, RunValue>? probe)
{
var name = new StringBuilder();
while (true)
{
if (i >= text.Length)
throw new ScriptFault($"unclosed ${{ in '{text}'");
if (text[i] == '}')
{
i++;
break;
}
if (text[i] == '$' && i + 1 < text.Length && text[i + 1] == '{')
{
i += 2;
name.Append(Reference(text, ref i, lookup, probe));
continue;
}
name.Append(text[i++]);
}
var n = name.ToString();
if (n.Length == 0)
throw new ScriptFault("empty ${}");
if (n.StartsWith("probe:", StringComparison.Ordinal))
return (probe ?? throw new ScriptFault($"no probes here: ${{{n}}}"))(n["probe:".Length..]).ToString();
return lookup(n) ?? throw new ScriptFault($"unresolved variable ${{{n}}}");
}
/// <summary>Plain names inside the innermost <c>${…}</c> (no nested <c>${</c>, no <c>probe:</c>).</summary>
public static IEnumerable<string> Names(string text)
{
for (var i = 0; i < text.Length - 1; i++)
{
if (text[i] != '$' || text[i + 1] != '{')
continue;
var close = text.IndexOf('}', i + 2);
if (close < 0)
yield break;
var inner = text[(i + 2)..close];
if (inner.Length > 0 && !inner.Contains("${", StringComparison.Ordinal) && !inner.StartsWith("probe:", StringComparison.Ordinal))
yield return inner;
}
}
}
public sealed record ScopeState(Dictionary<string, string> Vars, bool Local, OutputLevel Level);
/// <summary>Variable scopes: root (globals), include scopes (vars go to root, output level scoped), def-call scopes
/// (local vars). Lookup walks from the top down.</summary>
public sealed class VarScopes
{
private readonly List<ScopeState> _stack;
public VarScopes(OutputLevel level) => _stack = [new ScopeState(new Dictionary<string, string>(StringComparer.Ordinal), false, level)];
public int Depth => _stack.Count;
public OutputLevel Level
{
get => _stack[^1].Level;
set => _stack[^1] = _stack[^1] with { Level = value };
}
public void Push(bool local, OutputLevel level, IEnumerable<KeyValuePair<string, string>> bindings) =>
_stack.Add(new ScopeState(new Dictionary<string, string>(bindings, StringComparer.Ordinal), local, level));
public void Pop()
{
if (_stack.Count > 1)
_stack.RemoveAt(_stack.Count - 1);
}
public void PopTo(int depth)
{
while (_stack.Count > Math.Max(1, depth))
_stack.RemoveAt(_stack.Count - 1);
}
public string? Get(string name)
{
for (var i = _stack.Count - 1; i >= 0; i--)
{
if (_stack[i].Vars.TryGetValue(name, out var v))
return v;
}
return null;
}
public void Set(string name, string value)
{
for (var i = _stack.Count - 1; i >= 1; i--)
{
if (_stack[i].Local)
{
_stack[i].Vars[name] = value;
return;
}
}
_stack[0].Vars[name] = value;
}
public Dictionary<string, string> Visible()
{
var all = new Dictionary<string, string>(StringComparer.Ordinal);
foreach (var scope in _stack)
foreach (var (k, v) in scope.Vars)
all[k] = v;
return all;
}
public List<ScopeState> Snapshot() =>
[.. _stack.Select(s => s with { Vars = new Dictionary<string, string>(s.Vars, StringComparer.Ordinal) })];
public void Restore(IReadOnlyList<ScopeState> scopes)
{
_stack.Clear();
_stack.AddRange(scopes.Select(s => s with { Vars = new Dictionary<string, string>(s.Vars, StringComparer.Ordinal) }));
if (_stack.Count == 0)
_stack.Add(new ScopeState(new Dictionary<string, string>(StringComparer.Ordinal), false, OutputLevel.Labels));
}
}
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