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remove yesterday's generatoer, use new generator

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This commit is contained in:
Youmu Liu
2026-07-29 18:10:45 +08:00
parent 3db2bfd9af
commit 97576404cc
4 changed files with 328 additions and 132 deletions
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src/StgSharp.RegularAnalysis/Text/TextRegexSourceGen.GenClass.cs
+18 -4
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@@ -48,9 +48,10 @@ namespace StgSharp.RegularAnalysis.Text
* 2. The dispatch chain offers a window to L1, then L2, then L3, then L4. Higher
* consumption wins, so a shape spanning a whole region plus a tail is never split by
* a smaller generator.
* 3. L2, L4 and L5 together are sufficient for correctness. L1 and L3 only flatten what
* those would already emit, so an unimplemented one must return -1 cleanly rather
* than emit a partial result.
* 3. L2, L4, L5 and the required entries of L1 together are sufficient for correctness.
* The flattening entries of L1 and all of L3 only improve the shape of what those
* would already emit, so an unimplemented one must return -1 cleanly rather than
* emit a partial result.
* 4. A prefix consumes no IR. L1 to L4 describe what an instruction does, L5 decides
* when it runs and who reads the outcome.
* 5. Scope follows Prefix.WorkingRegion, not expression nesting.
@@ -60,6 +61,10 @@ namespace StgSharp.RegularAnalysis.Text
* A region lowers to do { ... } while(false), and POP lowers to break. The goto plus
* label scheme used by the .NET generated regex backend is deliberately not adopted.
*
* A FIND lowers to a candidate retry loop nested inside the region block. That loop is
* nearer than the region do block, so a POP inside it needs the __rN_done flag described
* in TextRegexSourceGen.GenClass.MultiIR.cs rather than a plain break.
*
* Generated variable names are owned by SourceGenContext. No generator invents one.
*
* The per shape checklist this backend is rebuilt against lives in
@@ -90,7 +95,6 @@ namespace StgSharp.RegularAnalysis.Text
// TODO L0.1 Emit the Match signature from ROS_char and SourceGenContext.InputSpan.
// TODO L0.2 Emit region anchor and region result slots, count from RegexInfo.RegionCount.
// TODO L0.3 Emit line result slots, only for lines an Observe_Line prefix refers to.
// TODO L0.4 Emit the whole pattern guard from RegexInfo.MinPredictLength.
// TODO L0.5 Emit the cursor, the step result and any scratch declaration the context collected.
//
@@ -121,6 +125,7 @@ namespace StgSharp.RegularAnalysis.Text
{
// GenerateRegion(region, sc, match_e, sub_match_list);
_ = TryGenerateAltChain(0, region, sc, match_e, sub_match_list);
_ = TryGenerateTryBlock(0, region, sc, match_e, sub_match_list);
if (end >= ir_sp.Length)
{
break;
@@ -133,6 +138,15 @@ namespace StgSharp.RegularAnalysis.Text
_ = se.AppendLine($@"public override MatchResult Match({ROS_char} text)")//
.AppendLine(@"{");
int min_predict_length = info.MinPredictLength;
if (min_predict_length > 0) {
_ = se.AppendLine($@"if (text.Length < {min_predict_length})")
.AppendLine(@"{")
.AppendLine(@"return default;")
.AppendLine(@"}")
.AppendLine();
}
int region_count = info.RegionCount;
for (int i = 0; i < region_count; i++)
{