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Small changeds on text regex source gen

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This commit is contained in:
Youmu Liu
2026-09-08 18:10:36 +08:00
parent 90c7538639
commit 8641fd4e08
3 changed files with 40 additions and 25 deletions
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src/Nitload.RegularAnalysis/Text/TextRegexSourceGen.GenClass.cs
+22 -18
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@@ -183,9 +183,10 @@ namespace Nitload.RegularAnalysis.Text
)
{
RegexAstNode current = node.Right;
// TODO(NGRA-NAMING): Reserve exclusive names for future ALT cursor/capture snapshots;
// their lifetime extends through retry labels, not just the candidate's emitted block.
string exit_label = context.RequestExitLabel();
ExitLabel exit_label = context.RequestExitLabel(ExitMode.Goto);
// TODO(NGRA): Walk every normalized ALT candidate exactly once. The final traversal
// shape and failure continuation are not wired yet.
@@ -350,7 +351,7 @@ namespace Nitload.RegularAnalysis.Text
bool is_greedy,
[NotNull] in SequenceEmitter<string> sc,
in SourceGenContext context,
string exit_label
in ExitLabel exit
)
{
if (min < 0 || (max >= 0 && max < min)) {
@@ -366,9 +367,11 @@ namespace Nitload.RegularAnalysis.Text
char expected = literal[0];
string expected_literal = FormatCharLiteral(expected);
string remain_span = context.RemainSpan;
// TODO(NGRA-NAMING): Allocate required_rest, required_matched, required_chunk_index,
// and additional_count through the exclusive-name pool, including loop-local names.
int scratch_scope_index = context.RequestScratchScopeIndex();
string exit_label_node = exit.GetLabelName();
string required_rest = $"__required_rest_{scratch_scope_index}";
string required_matched = $"__required_matched_{scratch_scope_index}";
string required_chunk_index = $"__required_chunk_index_{scratch_scope_index}";
@@ -384,7 +387,7 @@ namespace Nitload.RegularAnalysis.Text
string required_prefix = new(expected, min);
_ = sc.AppendLine($"if (!{remain_span}.{nameof(MemoryExtensions.StartsWith)}({FormatStringLiteral(required_prefix)}))")
.AppendLine("{")
.AppendLine($"goto {exit_label};")
.AppendLine($"goto {exit_label_node};")
.AppendLine("}")
.AppendLine($"{remain_span} = {remain_span}.Slice({min});");
}
@@ -399,7 +402,7 @@ namespace Nitload.RegularAnalysis.Text
_ = sc.AppendLine($"if ({remain_span}.Length < {min})")
.AppendLine("{")
.AppendLine($"goto {exit_label};")
.AppendLine($"goto {exit_label_node};")
.AppendLine("}")
.AppendLine($"{ROS_char} {required_rest} = {remain_span};")
.AppendLine($"bool {required_matched} = true;")
@@ -424,7 +427,7 @@ namespace Nitload.RegularAnalysis.Text
_ = sc.AppendLine($"if (!{required_matched})")
.AppendLine("{")
.AppendLine($"goto {exit_label};")
.AppendLine($"goto {exit_label_node};")
.AppendLine("}")
.AppendLine($"{remain_span} = {remain_span}.Slice({min});");
}
@@ -451,7 +454,6 @@ namespace Nitload.RegularAnalysis.Text
// a future continuation attempt fails and requests another repetition.
_ = sc.AppendLine("// TODO(NGRA): Retry the lazy COUNT tail from its continuation.");
}
}
private static void GenerateUnitSetCount(
@@ -460,7 +462,8 @@ namespace Nitload.RegularAnalysis.Text
int max,
bool is_greedy,
[NotNull] in SequenceEmitter<string> sc,
in SourceGenContext context
in SourceGenContext context,
in ExitLabel exit_label
)
{
if (min < 0 || (max >= 0 && max < min)) {
@@ -477,6 +480,7 @@ namespace Nitload.RegularAnalysis.Text
IReadOnlyList<RegexCharSet> charset = payload.Set;
string remain_span = context.RemainSpan;
// TODO(NGRA-NAMING): Allocate required_matched and additional_count through the
// exclusive-name pool. Reserve required_rest/required_chunk_index if emitted later.
int scratch_scope_index = context.RequestScratchScopeIndex();
@@ -533,7 +537,7 @@ namespace Nitload.RegularAnalysis.Text
bool is_greedy,
[NotNull] in SequenceEmitter<string> sc,
in SourceGenContext context,
string exit_label
in ExitLabel exit
)
{
if (min < 0 || (max >= 0 && max < min)) {
@@ -548,10 +552,12 @@ namespace Nitload.RegularAnalysis.Text
string expected_literal = FormatStringLiteral(literal);
string remain_span = context.RemainSpan;
// TODO(NGRA-NAMING): Allocate required_rest, required_matched, required_chunk_index,
// required_count, and additional_count through the exclusive-name pool. Flattened
// sibling COUNT nodes share the declaration space even after their exit labels.
int scratch_scope_index = context.RequestScratchScopeIndex();
string exit_label_node = exit.GetLabelName();
string required_rest = $"__required_rest_{scratch_scope_index}";
string required_matched = $"__required_matched_{scratch_scope_index}";
string required_chunk_index = $"__required_chunk_index_{scratch_scope_index}";
@@ -575,7 +581,7 @@ namespace Nitload.RegularAnalysis.Text
.AppendLine("}")
.AppendLine($"if ({required_count} != {min})")
.AppendLine("{")
.AppendLine($"goto {exit_label};")
.AppendLine($"goto {exit_label_node};")
.AppendLine("}")
.AppendLine($"{remain_span} = {required_rest};");
} else if (min <= flattened_unit_count_threshold / literal.Length)
@@ -589,7 +595,7 @@ namespace Nitload.RegularAnalysis.Text
string required_prefix = required_prefix_span.ToString();
_ = sc.AppendLine($"if (!{remain_span}.{starts_with}({FormatStringLiteral(required_prefix)}))")
.AppendLine("{")
.AppendLine($"goto {exit_label};")
.AppendLine($"goto {exit_label_node};")
.AppendLine("}")
.AppendLine($"{remain_span} = {remain_span}.Slice({min * literal.Length});");
}
@@ -638,7 +644,7 @@ namespace Nitload.RegularAnalysis.Text
_ = sc.AppendLine($"if (!{required_matched})")
.AppendLine("{")
.AppendLine($"goto {exit_label};")
.AppendLine($"goto {exit_label_node};")
.AppendLine("}")
.AppendLine($"{remain_span} = {required_rest};");
}
@@ -665,14 +671,14 @@ namespace Nitload.RegularAnalysis.Text
// a future continuation attempt fails and requests another repetition.
_ = sc.AppendLine("// TODO(NGRA): Retry the lazy COUNT tail from its continuation.");
}
}
private static void GenerateCount(
RegexAstNode node,
[NotNull] in SequenceEmitter<string> sc,
in List<SequenceEmitter<string>> func_list,
in SourceGenContext context
in SourceGenContext context,
in ExitLabel exit
)
{
RegexAstNode value = RegexAstNode.IsNullOrEmpty(node.Left) ? node.Right : node.Left;
@@ -683,9 +689,10 @@ namespace Nitload.RegularAnalysis.Text
int min = payload.Min;
int max = payload.Max;
bool is_greedy = payload.IsGreedy;
// TODO(NGRA-NAMING): Reserve exclusive names for future repetition/rollback state
// across complex COUNT retries; recursive children must use the same method pool.
string exit_label = context.RequestExitLabel();
ExitLabel exit_label = context.RequestExitLabel(ExitMode.Goto);
if ((value.Label & RegexElementLabel.SEQUENCE) == 0)
{
// TODO(NGRA): Emit min/max repetition, zero-width progress protection, greedy vs.
@@ -699,10 +706,7 @@ namespace Nitload.RegularAnalysis.Text
GenerateUnitCount(value, min, max, is_greedy, sc, context, exit_label);
break;
case RegexElementLabel.UNIT_SET:
GenerateUnitSetCount(value, min, max, is_greedy, sc, context);
// TODO(NGRA): Emit a bounded/unbounded charset counting loop, preferably
// using IndexOfAnyExcept where the charset shape permits it.
GenerateUnitSetCount(value, min, max, is_greedy, sc, context, exit_label);
break;
case RegexElementLabel.UNIT_SPAN:
GenerateUnitSpanCount(value, min, max, is_greedy, sc, context, exit_label);