From b27da2a93cc42afcf16ab539dc7aa1a84d12ee8c Mon Sep 17 00:00:00 2001
From: Patrick Spek <p.spek@tyil.nl>
Date: Sun, 15 Nov 2020 08:47:32 +0100
Subject: Rename Perl 6 to Raku

---
 lib/Hash/Merge.rakumod | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 lib/Hash/Merge.rakumod

(limited to 'lib/Hash/Merge.rakumod')

diff --git a/lib/Hash/Merge.rakumod b/lib/Hash/Merge.rakumod
new file mode 100644
index 0000000..5d496a4
--- /dev/null
+++ b/lib/Hash/Merge.rakumod
@@ -0,0 +1,78 @@
+#! /usr/bin/env false
+
+use v6.d;
+
+unit module Hash::Merge;
+
+#| Merge any number of Hashes together.
+sub merge-hashes (
+	#| Any number of Hashes to merge together.
+	*@hashes,
+
+	--> Hash
+) is export {
+	my %result = @hashes.shift;
+
+	# Nothing to do if we only got 1 argument
+	return %result unless @hashes.elems;
+
+	for ^@hashes.elems {
+		%result = merge-hash(%result, @hashes.shift);
+	}
+
+	%result;
+}
+
+#| Merge two hashes together.
+sub merge-hash (
+	#| The original Hash to merge the second Hash into.
+	%first,
+
+	#| The second hash, which will be merged into the first Hash.
+	%second,
+
+	#| Boolean to set whether Associative objects should be merged on their
+	#| own. When set to False, Associative objects in %second will
+	#| overwrite those from %first.
+	Bool:D :$deep = True,
+
+	#| Boolean to set whether Positional objects should be appended. When
+	#| set to False, Positional objects in %second will overwrite those
+	#| from %first.
+	Bool:D :$positional-append = True,
+
+	--> Hash
+) is export {
+	my %result = %first;
+
+	for %second.keys -> $key {
+		# If the key doesn't exist yet in %first, it can be inserted without worry.
+		if (%first{$key}:!exists) {
+			%result{$key} = %second{$key};
+			next;
+		}
+
+		given (%first{$key}) {
+			# Associative objects need to be merged deeply.
+			when Associative {
+				%result{$key} = $deep
+					?? merge-hash(%first{$key}, %second{$key}, :$deep, :$positional-append)
+					!! %second{$key}
+			}
+			# Positional objects can be merged or overwritten depending on $append-array.
+			when Positional {
+				%result{$key} = $positional-append
+					?? (|%first{$key}, |%second{$key})
+					!! %second{$key}
+			}
+			# Anything else will just overwrite.
+			default {
+				%result{$key} = %second{$key};
+			}
+		}
+	}
+
+	%result;
+}
+
+# vim: ft=raku ts=4 sw=4 et
-- 
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