Fix preg_match named capturing groups

Co-Authored-By: Michael Voříšek <[email protected]>

Author: 2 people

patches/Grammar.patch

@@ -1,5 +1,16 @@
---- Grammar.pp  2024-05-18 12:15:53
-+++ Grammar.pp.fix      2024-05-18 12:15:05
+diff --git a/Grammar.pp b/Grammar.pp
+index 5157084..8384417 100644
+--- a/Grammar.pp
++++ b/Grammar.pp
+@@ -73,7 +73,7 @@
+ %token  co:comment               .*?(?=(?<!\\)\))
+
+ // Capturing group.
+-%token  named_capturing_         \(\?<              -> nc
++%token  named_capturing_         \(\?P?<            -> nc
+ %token  nc:_named_capturing      >                  -> default
+ %token  nc:capturing_name        .+?(?=(?<!\\)>)
+ %token  non_capturing_           \(\?:
 @@ -109,7 +109,7 @@
  // Please, see PCRESYNTAX(3), General Category properties, PCRE special category
  // properties and script names for \p{} and \P{}.
@@ -9,7 +20,7 @@
  %token match_point_reset         \\K
  %token literal                   \\.|.
 
-@@ -168,7 +168,7 @@
+@@ -168,7 +168,7 @@ quantifier:
          ::negative_class_:: #negativeclass
        | ::class_::
      )
@@ -18,7 +29,7 @@
      ::_class::
 
  #range:
-@@ -178,7 +178,7 @@
+@@ -178,7 +178,7 @@ simple:
      capturing()
    | literal()
 
@@ -27,7 +38,7 @@
      ::comment_:: <comment>? ::_comment:: #comment
    | (
          ::named_capturing_:: <capturing_name> ::_named_capturing:: #namedcapturing
-@@ -191,6 +191,7 @@
+@@ -191,6 +191,7 @@ capturing:
 
  literal:
      <character>

tests/PHPStan/Analyser/nsrt/preg_match_shapes.php

@@ -93,10 +93,9 @@ function doNonCapturingGroup(string $s): void {
 
 function doNamedSubpattern(string $s): void {
 	if (preg_match('/\w-(?P<num>\d+)-(\w)/', $s, $matches)) {
-		// could be assertType('array{0: string, num: string, 1: string, 2: string, 3: string}', $matches);
-		assertType('array<string>', $matches);
+		assertType('array{0: string, num: string, 1: string, 2: string}', $matches);
 	}
-	assertType('array<string>', $matches);
+	assertType('array{}|array{0: string, num: string, 1: string, 2: string}', $matches);
 
 	if (preg_match('/^(?<name>\S+::\S+)/', $s, $matches)) {
 		assertType('array{0: string, name: string, 1: string}', $matches);
@@ -364,3 +363,23 @@ function bug11291(string $s): void {
 	}
 	assertType('array{}|array{0: string, 1: string, 2?: string, 3?: string}', $matches);
 }
+
+function bug11323a(string $s): void
+{
+	if (preg_match('/Price: (?P<currency>£|€)\d+/', $s, $matches)) {
+		assertType('array{0: string, currency: string, 1: string}', $matches);
+	} else {
+		assertType('array{}', $matches);
+	}
+	assertType('array{}|array{0: string, currency: string, 1: string}', $matches);
+}
+
+function bug11323b(string $s): void
+{
+	if (preg_match('/Price: (?<currency>£|€)\d+/', $s, $matches)) {
+		assertType('array{0: string, currency: string, 1: string}', $matches);
+	} else {
+		assertType('array{}', $matches);
+	}
+	assertType('array{}|array{0: string, currency: string, 1: string}', $matches);
+}

tests/PHPStan/Analyser/nsrt/preg_match_shapes_php82.php

@@ -13,7 +13,7 @@ function doNonAutoCapturingFlag(string $s): void {
 	assertType('array{}|array{string, string}', $matches);
 
 	if (preg_match('/(\d+)(?P<num>\d+)/n', $s, $matches)) {
-		assertType('array<string>', $matches); // could be 'array{0: string, num: string, 1: string}'
+		assertType('array{0: string, 1: string, num: string, 2: string}', $matches);
 	}
-	assertType('array<string>', $matches);
+	assertType('array{}|array{0: string, 1: string, num: string, 2: string}', $matches);
 }