[ruby/prism] Support for the macIceland encoding

https://github.com/ruby/prism/commit/f433d1b51b

prism/enc/pm_encoding.h

@@ -190,6 +190,7 @@ extern pm_encoding_t pm_encoding_iso_8859_14;
 extern pm_encoding_t pm_encoding_iso_8859_15;
 extern pm_encoding_t pm_encoding_iso_8859_16;
 extern pm_encoding_t pm_encoding_koi8_r;
+extern pm_encoding_t pm_encoding_mac_iceland;
 extern pm_encoding_t pm_encoding_shift_jis;
 extern pm_encoding_t pm_encoding_utf_8;
 extern pm_encoding_t pm_encoding_utf8_mac;

prism/enc/pm_tables.c

@@ -720,6 +720,30 @@ static uint8_t pm_encoding_koi8_r_table[256] = {
     7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, // Fx
 };
 
+/**
+ * Each element of the following table contains a bitfield that indicates a
+ * piece of information about the corresponding macIceland character.
+ */
+static uint8_t pm_encoding_mac_iceland_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 windows-1250 character.
@@ -1030,6 +1054,7 @@ PRISM_ENCODING_TABLE(iso_8859_14)
 PRISM_ENCODING_TABLE(iso_8859_15)
 PRISM_ENCODING_TABLE(iso_8859_16)
 PRISM_ENCODING_TABLE(koi8_r)
+PRISM_ENCODING_TABLE(mac_iceland)
 PRISM_ENCODING_TABLE(windows_1250)
 PRISM_ENCODING_TABLE(windows_1251)
 PRISM_ENCODING_TABLE(windows_1252)
@@ -1352,6 +1377,16 @@ pm_encoding_t pm_encoding_koi8_r = {
     .multibyte = false
 };
 
+/** macIceland */
+pm_encoding_t pm_encoding_mac_iceland = {
+    .name = "macIceland",
+    .char_width = pm_encoding_single_char_width,
+    .alnum_char = pm_encoding_mac_iceland_alnum_char,
+    .alpha_char = pm_encoding_mac_iceland_alpha_char,
+    .isupper_char = pm_encoding_mac_iceland_isupper_char,
+    .multibyte = false
+};
+
 /** Windows-1250 */
 pm_encoding_t pm_encoding_windows_1250 = {
     .name = "Windows-1250",

prism/prism.c

@@ -6134,6 +6134,9 @@ parser_lex_magic_comment_encoding_value(pm_parser_t *parser, const uint8_t *star
             case 'L': case 'l':
                 ENCODING1("locale", pm_encoding_utf_8);
                 break;
+            case 'M': case 'm':
+                ENCODING1("macIceland", pm_encoding_mac_iceland);
+                break;
             case 'P': case 'p':
                 ENCODING1("PCK", pm_encoding_windows_31j);
                 break;
@@ -6269,6 +6272,8 @@ parser_lex_magic_comment_emacs_marker(pm_parser_t *parser, const uint8_t *cursor
  */
 static inline bool
 parser_lex_magic_comment(pm_parser_t *parser, bool semantic_token_seen) {
+    bool result = true;
+
     const uint8_t *start = parser->current.start + 1;
     const uint8_t *end = parser->current.end;
     if (end - start <= 7) return false;
@@ -6366,7 +6371,7 @@ parser_lex_magic_comment(pm_parser_t *parser, bool semantic_token_seen) {
                 (key_length == 8 && pm_strncasecmp(key_source, (const uint8_t *) "encoding", 8) == 0) ||
                 (key_length == 6 && pm_strncasecmp(key_source, (const uint8_t *) "coding", 6) == 0)
             ) {
-                parser_lex_magic_comment_encoding_value(parser, value_start, value_end);
+                result = parser_lex_magic_comment_encoding_value(parser, value_start, value_end);
             }
         }
 
@@ -6393,7 +6398,7 @@ parser_lex_magic_comment(pm_parser_t *parser, bool semantic_token_seen) {
         }
     }
 
-    return true;
+    return result;
 }
 
 /******************************************************************************/