[ruby/prism] feat: add encoding for IBM865

(https://github.com/ruby/prism/pull/1884)

* feat: add encoding for IBM865

* style: fix incorrect autoformat

https://github.com/ruby/prism/commit/14c6ae0182

4 files changed, 39 insertions, 0 deletions

diff --git a/prism/enc/pm_encoding.h b/prism/enc/pm_encoding.h
index bd7d7ba1f2..a062bbe591 100644
--- a/prism/enc/pm_encoding.h
+++ b/prism/enc/pm_encoding.h
@@ -177,6 +177,7 @@ extern pm_encoding_t pm_encoding_ibm860;
 extern pm_encoding_t pm_encoding_ibm861;
 extern pm_encoding_t pm_encoding_ibm862;
 extern pm_encoding_t pm_encoding_ibm864;
+extern pm_encoding_t pm_encoding_ibm865;
 extern pm_encoding_t pm_encoding_ibm866;
 extern pm_encoding_t pm_encoding_iso_8859_1;
 extern pm_encoding_t pm_encoding_iso_8859_2;
diff --git a/prism/enc/pm_tables.c b/prism/enc/pm_tables.c
index a4d479998a..87c7bfb495 100644
--- a/prism/enc/pm_tables.c
+++ b/prism/enc/pm_tables.c
@@ -386,6 +386,30 @@ static uint8_t pm_encoding_ibm864_table[256] = {
 
 /**
  * Each element of the following table contains a bitfield that indicates a
+ * piece of information about the corresponding IBM865 character.
+ */
+static uint8_t pm_encoding_ibm865_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 IBM866 character.
  */
 static uint8_t pm_encoding_ibm866_table[256] = {
@@ -1328,6 +1352,7 @@ PRISM_ENCODING_TABLE(ibm860)
 PRISM_ENCODING_TABLE(ibm861)
 PRISM_ENCODING_TABLE(ibm862)
 PRISM_ENCODING_TABLE(ibm864)
+PRISM_ENCODING_TABLE(ibm865)
 PRISM_ENCODING_TABLE(ibm866)
 PRISM_ENCODING_TABLE(iso_8859_1)
 PRISM_ENCODING_TABLE(iso_8859_2)
@@ -1538,6 +1563,16 @@ pm_encoding_t pm_encoding_ibm864 = {
 };
 
 /** IBM866 */
+pm_encoding_t pm_encoding_ibm865 = {
+    .name = "IBM865",
+    .char_width = pm_encoding_single_char_width,
+    .alnum_char = pm_encoding_ibm865_alnum_char,
+    .alpha_char = pm_encoding_ibm865_alpha_char,
+    .isupper_char = pm_encoding_ibm865_isupper_char,
+    .multibyte = false
+};
+
+/** IBM866 */
 pm_encoding_t pm_encoding_ibm866 = {
     .name = "IBM866",
     .char_width = pm_encoding_single_char_width,
diff --git a/prism/prism.c b/prism/prism.c
index 850b35c3c7..86d9fce00f 100644
--- a/prism/prism.c
+++ b/prism/prism.c
@@ -6077,6 +6077,7 @@ parser_lex_magic_comment_encoding_value(pm_parser_t *parser, const uint8_t *star
                 ENCODING1("CP861", pm_encoding_ibm861);
                 ENCODING1("CP862", pm_encoding_ibm862);
                 ENCODING1("CP864", pm_encoding_ibm864);
+                ENCODING1("CP865", pm_encoding_ibm865);
                 ENCODING1("CP866", pm_encoding_ibm866);
                 ENCODING1("CP874", pm_encoding_windows_874);
                 ENCODING1("CP878", pm_encoding_koi8_r);
@@ -6118,6 +6119,7 @@ parser_lex_magic_comment_encoding_value(pm_parser_t *parser, const uint8_t *star
                 ENCODING1("IBM861", pm_encoding_ibm861);
                 ENCODING1("IBM862", pm_encoding_ibm862);
                 ENCODING1("IBM864", pm_encoding_ibm864);
+                ENCODING1("IBM865", pm_encoding_ibm865);
                 ENCODING1("IBM866", pm_encoding_ibm866);
                 ENCODING2("ISO-8859-1", "ISO8859-1", pm_encoding_iso_8859_1);
                 ENCODING2("ISO-8859-2", "ISO8859-2", pm_encoding_iso_8859_2);
diff --git a/test/prism/encoding_test.rb b/test/prism/encoding_test.rb
index ce9a2fc998..bc9aae8e8a 100644
--- a/test/prism/encoding_test.rb
+++ b/test/prism/encoding_test.rb
@@ -24,6 +24,7 @@ module Prism
       Encoding::IBM861 =>       0x00...0x100,
       Encoding::IBM862 =>       0x00...0x100,
       Encoding::IBM864 =>       0x00...0x100,
+      Encoding::IBM865 =>       0x00...0x100,
       Encoding::IBM866 =>       0x00...0x100,
       Encoding::ISO_8859_1 =>   0x00...0x100,
       Encoding::ISO_8859_2 =>   0x00...0x100,