From 7dba4f424d41290131c229efbdd34930b27354bc Mon Sep 17 00:00:00 2001
From: Kevin Newton <kddnewton@gmail.com>
Date: Sun, 12 Nov 2023 00:15:24 -0500
Subject: [PATCH] [ruby/prism] IBM861 encoding

https://github.com/ruby/prism/commit/6d2b59384a
---
 prism/enc/pm_encoding.h     |  1 +
 prism/enc/pm_tables.c       | 35 +++++++++++++++++++++++++++++++++++
 prism/prism.c               |  2 ++
 test/prism/encoding_test.rb |  1 +
 4 files changed, 39 insertions(+)

diff --git a/prism/enc/pm_encoding.h b/prism/enc/pm_encoding.h
index 7f252be78e..31d196eddb 100644
--- a/prism/enc/pm_encoding.h
+++ b/prism/enc/pm_encoding.h
@@ -172,6 +172,7 @@ extern pm_encoding_t pm_encoding_ibm852;
 extern pm_encoding_t pm_encoding_ibm855;
 extern pm_encoding_t pm_encoding_ibm857;
 extern pm_encoding_t pm_encoding_ibm860;
+extern pm_encoding_t pm_encoding_ibm861;
 extern pm_encoding_t pm_encoding_iso_8859_1;
 extern pm_encoding_t pm_encoding_iso_8859_2;
 extern pm_encoding_t pm_encoding_iso_8859_3;
diff --git a/prism/enc/pm_tables.c b/prism/enc/pm_tables.c
index 68a10afcd6..e85f94f796 100644
--- a/prism/enc/pm_tables.c
+++ b/prism/enc/pm_tables.c
@@ -288,6 +288,30 @@ static uint8_t pm_encoding_ibm860_table[256] = {
     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Fx
 };
 
+/**
+ * Each element of the following table contains a bitfield that indicates a
+ * piece of information about the corresponding IBM861 character.
+ */
+static uint8_t pm_encoding_ibm861_table[256] = {
+//  0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 1x
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 2x
+    2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 0, 0, 0, 0, 0, 0, // 3x
+    0, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, // 4x
+    7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 0, 0, 0, 0, 0, // 5x
+    0, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, // 6x
+    3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 0, 0, 0, 0, 0, // 7x
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 8x
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 9x
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Ax
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Bx
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Cx
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Dx
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Ex
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Fx
+};
+
 /**
  * Each element of the following table contains a bitfield that indicates a
  * piece of information about the corresponding ISO-8859-1 character.
@@ -964,6 +988,7 @@ PRISM_ENCODING_TABLE(ibm852)
 PRISM_ENCODING_TABLE(ibm855)
 PRISM_ENCODING_TABLE(ibm857)
 PRISM_ENCODING_TABLE(ibm860)
+PRISM_ENCODING_TABLE(ibm861)
 PRISM_ENCODING_TABLE(iso_8859_1)
 PRISM_ENCODING_TABLE(iso_8859_2)
 PRISM_ENCODING_TABLE(iso_8859_3)
@@ -1122,6 +1147,16 @@ pm_encoding_t pm_encoding_ibm860 = {
     .multibyte = false
 };
 
+/** IBM861 */
+pm_encoding_t pm_encoding_ibm861 = {
+    .name = "IBM861",
+    .char_width = pm_encoding_single_char_width,
+    .alnum_char = pm_encoding_ibm861_alnum_char,
+    .alpha_char = pm_encoding_ibm861_alpha_char,
+    .isupper_char = pm_encoding_ibm861_isupper_char,
+    .multibyte = false
+};
+
 /** ISO-8859-1 */
 pm_encoding_t pm_encoding_iso_8859_1 = {
     .name = "ISO-8859-1",
diff --git a/prism/prism.c b/prism/prism.c
index bb33d4da17..1ec789003b 100644
--- a/prism/prism.c
+++ b/prism/prism.c
@@ -6073,6 +6073,7 @@ parser_lex_magic_comment_encoding_value(pm_parser_t *parser, const uint8_t *star
                 ENCODING1("CP855", pm_encoding_cp855);
                 ENCODING1("CP857", pm_encoding_ibm857);
                 ENCODING1("CP860", pm_encoding_ibm860);
+                ENCODING1("CP861", pm_encoding_ibm861);
                 ENCODING1("CP878", pm_encoding_koi8_r);
                 ENCODING2("CP932", "csWindows31J", pm_encoding_windows_31j);
                 ENCODING1("CP936", pm_encoding_gbk);
@@ -6108,6 +6109,7 @@ parser_lex_magic_comment_encoding_value(pm_parser_t *parser, const uint8_t *star
                 ENCODING1("IBM855", pm_encoding_ibm855);
                 ENCODING1("IBM857", pm_encoding_ibm857);
                 ENCODING1("IBM860", pm_encoding_ibm860);
+                ENCODING1("IBM861", pm_encoding_ibm861);
                 ENCODING2("ISO-8859-1", "ISO8859-1", pm_encoding_iso_8859_1);
                 ENCODING2("ISO-8859-2", "ISO8859-2", pm_encoding_iso_8859_2);
                 ENCODING2("ISO-8859-3", "ISO8859-3", pm_encoding_iso_8859_3);
diff --git a/test/prism/encoding_test.rb b/test/prism/encoding_test.rb
index 3b849e7ced..45c6e83269 100644
--- a/test/prism/encoding_test.rb
+++ b/test/prism/encoding_test.rb
@@ -22,6 +22,7 @@ module Prism
       Encoding::IBM855,
       Encoding::IBM857,
       Encoding::IBM860,
+      Encoding::IBM861,
       Encoding::ISO_8859_1,
       Encoding::ISO_8859_2,
       Encoding::ISO_8859_3,