[PATCH] D56090: Add a matcher for members of an initializer list expression

[Hyrum Wright via Phabricator via cfe-commits]

hwright created this revision.
hwright added a reviewer: aaron.ballman.
hwright added a project: clang.
Herald added a subscriber: cfe-commits.

Much like `hasArg` for various call expressions, this allows `LibTooling` users 
to match against a member of an initializer list.

This is currently being used as part of the `abseil-duration-scale` clang-tidy 
check.


Repository:
  rC Clang

https://reviews.llvm.org/D56090

Files:
  include/clang/ASTMatchers/ASTMatchers.h


Index: include/clang/ASTMatchers/ASTMatchers.h
===================================================================
--- include/clang/ASTMatchers/ASTMatchers.h
+++ include/clang/ASTMatchers/ASTMatchers.h
@@ -3514,6 +3514,20 @@
               *Node.getArg(N)->IgnoreParenImpCasts(), Finder, Builder));
 }
 
+/// Matches the n'th item of an initializer list expression.
+///
+/// Example matches y.
+///     (matcher = initListExpr(hasInit(0, expr())))
+/// \code
+///   int x{y}.
+/// \endcode
+AST_MATCHER_P2(InitListExpr, hasInit, unsigned, N,
+               ast_matchers::internal::Matcher<Expr>, InnerMatcher) {
+  return N < Node.getNumInits() &&
+          InnerMatcher.matches(*Node.getInit(N)->IgnoreParenImpCasts(), Finder,
+                               Builder);
+}
+
 /// Matches declaration statements that contain a specific number of
 /// declarations.
 ///



Index: include/clang/ASTMatchers/ASTMatchers.h
===================================================================
--- include/clang/ASTMatchers/ASTMatchers.h
+++ include/clang/ASTMatchers/ASTMatchers.h
@@ -3514,6 +3514,20 @@
               *Node.getArg(N)->IgnoreParenImpCasts(), Finder, Builder));
 }
 
+/// Matches the n'th item of an initializer list expression.
+///
+/// Example matches y.
+///     (matcher = initListExpr(hasInit(0, expr())))
+/// \code
+///   int x{y}.
+/// \endcode
+AST_MATCHER_P2(InitListExpr, hasInit, unsigned, N,
+               ast_matchers::internal::Matcher<Expr>, InnerMatcher) {
+  return N < Node.getNumInits() &&
+          InnerMatcher.matches(*Node.getInit(N)->IgnoreParenImpCasts(), Finder,
+                               Builder);
+}
+
 /// Matches declaration statements that contain a specific number of
 /// declarations.
 ///

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