1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
|
// Provenance: own design — shared run scripts (spec §3)
using System.Globalization;
using System.Text.RegularExpressions;
namespace Godosa.Core.Runs.Scripts;
/// <summary>Format v1 parser: one file → <see cref="ScriptFile"/>; every error collected (never throws).</summary>
public static partial class ScriptParser
{
private sealed record Line(int Number, int Indent, string Text);
[GeneratedRegex(@"^set\s+([A-Za-z_][\w.\-]*)\s*=\s*(.*)$")]
private static partial Regex SetLine();
[GeneratedRegex(@"^def\s+([A-Za-z_][\w\-]*)\s*\(([^)]*)\)\s*:$")]
private static partial Regex DefLine();
[GeneratedRegex(@"^([A-Za-z_][\w\-]*)\s*(?:\(([^)]*)\))?$")]
private static partial Regex CallTarget();
public static ScriptFile Parse(string path, string text)
{
var errors = new List<ScriptError>();
var lines = new List<Line>();
var raw = text.TrimStart('\uFEFF').Replace("\r\n", "\n").Split('\n');
for (var i = 0; i < raw.Length; i++)
{
var at = new SourceRef(path, i + 1);
var stripped = StepLexer.StripComment(raw[i]).TrimEnd();
if (stripped.Trim().Length == 0)
continue;
var indent = stripped.Length - stripped.TrimStart(' ', '\t').Length;
if (stripped[..indent].Contains('\t'))
{
errors.Add(new ScriptError(at, "tab in indentation"));
continue;
}
if (indent % 2 != 0)
{
errors.Add(new ScriptError(at, "indent not a multiple of 2"));
continue;
}
lines.Add(new Line(i + 1, indent / 2, stripped.Trim()));
}
var format = 0;
RunMode? mode = null;
ulong? seed = null;
var varFiles = new List<string>();
var pos = 0;
if (lines.Count == 0 || !lines[0].Text.StartsWith("format ", StringComparison.Ordinal))
errors.Add(new ScriptError(new SourceRef(path, lines.Count > 0 ? lines[0].Number : 1), "first line must be 'format N'"));
else
{
var value = lines[0].Text["format ".Length..].Trim();
if (!int.TryParse(value, CultureInfo.InvariantCulture, out format) || format < 1 || format > ScriptFormat.Latest)
{
errors.Add(new ScriptError(new SourceRef(path, lines[0].Number), $"unknown format {value} (latest {ScriptFormat.Latest})"));
format = 0;
}
pos = 1;
}
for (; pos < lines.Count && lines[pos].Indent == 0 && IsHeader(lines[pos].Text); pos++)
Header(lines[pos], path, errors, ref mode, ref seed, varFiles);
var body = Block(lines, ref pos, 0, path, errors);
return new ScriptFile(path, format, mode, seed, varFiles, body, errors);
}
private static bool IsHeader(string text) =>
text.StartsWith("mode ", StringComparison.Ordinal) || text.StartsWith("seed ", StringComparison.Ordinal)
|| text.StartsWith("vars ", StringComparison.Ordinal) || text.StartsWith("format ", StringComparison.Ordinal);
private static void Header(Line line, string path, List<ScriptError> errors, ref RunMode? mode, ref ulong? seed, List<string> varFiles)
{
var at = new SourceRef(path, line.Number);
var value = line.Text[(line.Text.IndexOf(' ') + 1)..].Trim();
switch (line.Text[..line.Text.IndexOf(' ')])
{
case "mode":
mode = value switch { "player" => RunMode.Player, "debug" => RunMode.Debug, _ => null };
if (mode == null)
errors.Add(new ScriptError(at, "mode must be player or debug"));
break;
case "seed":
if (ulong.TryParse(value, CultureInfo.InvariantCulture, out var s))
seed = s;
else
errors.Add(new ScriptError(at, $"bad seed '{value}'"));
break;
case "vars":
varFiles.Add(value);
break;
default:
errors.Add(new ScriptError(at, "format must be the first line only"));
break;
}
}
private static List<Node> Block(List<Line> lines, ref int pos, int indent, string path, List<ScriptError> errors)
{
var nodes = new List<Node>();
while (pos < lines.Count)
{
var line = lines[pos];
if (line.Indent < indent)
break;
var at = new SourceRef(path, line.Number);
if (line.Indent > indent)
{
errors.Add(new ScriptError(at, "unexpected indent"));
pos++;
continue;
}
pos++;
if (indent == 0 && IsHeader(line.Text))
{
errors.Add(new ScriptError(at, "header line after steps"));
continue;
}
var hasBody = pos < lines.Count && lines[pos].Indent == indent + 1;
if (line.Text.EndsWith(':') && (hasBody || IsBlockKeyword(line.Text)))
{
var body = hasBody ? Block(lines, ref pos, indent + 1, path, errors) : [];
if (!hasBody)
errors.Add(new ScriptError(at, "empty block"));
if (BlockHeader(line.Text, at, body, errors) is { } node)
nodes.Add(node);
continue;
}
if (Statement(line.Text, at, errors) is { } statement)
nodes.Add(statement);
}
return nodes;
}
/// <summary>A line ending in ':' is a block header when it has an indented body or starts with a block keyword;
/// otherwise a statement (<c>log Done:</c>).</summary>
private static bool IsBlockKeyword(string text) =>
text is "setup:" or "try:" || text.StartsWith("step ", StringComparison.Ordinal) || text.StartsWith("def ", StringComparison.Ordinal);
private static Node? BlockHeader(string text, SourceRef at, List<Node> body, List<ScriptError> errors)
{
if (text == "setup:")
return new BlockNode(at, text, BlockKind.Setup, null, body);
if (text == "try:")
return new BlockNode(at, text, BlockKind.Try, null, body);
if (text.StartsWith("step ", StringComparison.Ordinal) && text.Length > "step :".Length)
return new BlockNode(at, text, BlockKind.Step, text["step ".Length..^1].Trim(), body);
if (DefLine().Match(text) is { Success: true } def)
{
var parameters = def.Groups[2].Value.Split(',', StringSplitOptions.TrimEntries | StringSplitOptions.RemoveEmptyEntries);
return new DefNode(at, text, def.Groups[1].Value, parameters, body);
}
errors.Add(new ScriptError(at, $"unknown block '{text}'"));
return null;
}
private static Node? Statement(string text, SourceRef at, List<ScriptError> errors)
{
var space = text.IndexOf(' ');
var head = space < 0 ? text : text[..space];
var rest = space < 0 ? "" : text[(space + 1)..].Trim();
try
{
// Validate quoting once for every line (log "abc → unterminated quote).
StepLexer.Tokens(rest);
}
catch (FormatException e)
{
errors.Add(new ScriptError(at, e.Message));
return null;
}
switch (head)
{
case "set":
if (SetLine().Match(text) is not { Success: true } set)
{
errors.Add(new ScriptError(at, "bad set (set name = value)"));
return null;
}
var value = set.Groups[2].Value.Trim();
if (value.Length >= 2 && value[0] == '"' && value[^1] == '"')
value = StepLexer.Tokens(value)[0].Text;
return new SetNode(at, text, set.Groups[1].Value, value);
case "wait":
var last = rest.LastIndexOf(' ');
if (last < 0)
{
errors.Add(new ScriptError(at, "wait needs a condition and a timeout"));
return null;
}
var timeout = rest[(last + 1)..];
if (Durations.Frames(timeout) is not { } frames)
{
errors.Add(new ScriptError(at, $"bad timeout '{timeout}'"));
return null;
}
return new WaitNode(at, text, rest[..last].Trim(), frames);
case "expect":
if (rest.Length == 0)
{
errors.Add(new ScriptError(at, "expect needs a condition"));
return null;
}
return new ExpectNode(at, text, rest);
case "include":
return rest.Length == 0 || rest.Contains(' ')
? Error(errors, at, "include takes one path")
: new IncludeNode(at, text, rest);
case "checkpoint":
return rest.Length == 0 || rest.Contains(' ')
? Error(errors, at, "checkpoint takes one name")
: new CheckpointNode(at, text, rest);
case "call":
if (CallTarget().Match(rest) is not { Success: true } call)
return Error(errors, at, "bad call (call name(args))");
var args = call.Groups[2].Success
? call.Groups[2].Value.Split(',', StringSplitOptions.TrimEntries).Where(a => a.Length > 0).ToArray()
: [];
return new CallNode(at, text, call.Groups[1].Value, args);
default:
return new VerbNode(at, text, head, rest);
}
}
private static Node? Error(List<ScriptError> errors, SourceRef at, string message)
{
errors.Add(new ScriptError(at, message));
return null;
}
}
|
