fix msvc

vendor/mruby-compiler2/lib/prism/src/util/pm_strpbrk.c

@@ -0,0 +1,206 @@
+#include "prism/util/pm_strpbrk.h"
+
+/**
+ * Add an invalid multibyte character error to the parser.
+ */
+static inline void
+pm_strpbrk_invalid_multibyte_character(pm_parser_t *parser, const uint8_t *start, const uint8_t *end) {
+    pm_diagnostic_list_append_format(&parser->error_list, start, end, PM_ERR_INVALID_MULTIBYTE_CHARACTER, *start);
+}
+
+/**
+ * Set the explicit encoding for the parser to the current encoding.
+ */
+static inline void
+pm_strpbrk_explicit_encoding_set(pm_parser_t *parser, const uint8_t *source, size_t width) {
+    if (parser->explicit_encoding != NULL) {
+        if (parser->explicit_encoding == parser->encoding) {
+            // Okay, we already locked to this encoding.
+        } else if (parser->explicit_encoding == PM_ENCODING_UTF_8_ENTRY) {
+            // Not okay, we already found a Unicode escape sequence and this
+            // conflicts.
+            pm_diagnostic_list_append_format(&parser->error_list, source, source + width, PM_ERR_MIXED_ENCODING, parser->encoding->name);
+        } else {
+            // Should not be anything else.
+            assert(false && "unreachable");
+        }
+    }
+
+    parser->explicit_encoding = parser->encoding;
+}
+
+/**
+ * This is the default path.
+ */
+static inline const uint8_t *
+pm_strpbrk_utf8(pm_parser_t *parser, const uint8_t *source, const uint8_t *charset, size_t maximum, bool validate) {
+    size_t index = 0;
+
+    while (index < maximum) {
+        if (strchr((const char *) charset, source[index]) != NULL) {
+            return source + index;
+        }
+
+        if (source[index] < 0x80) {
+            index++;
+        } else {
+            size_t width = pm_encoding_utf_8_char_width(source + index, (ptrdiff_t) (maximum - index));
+
+            if (width > 0) {
+                index += width;
+            } else if (!validate) {
+                index++;
+            } else {
+                // At this point we know we have an invalid multibyte character.
+                // We'll walk forward as far as we can until we find the next
+                // valid character so that we don't spam the user with a ton of
+                // the same kind of error.
+                const size_t start = index;
+
+                do {
+                    index++;
+                } while (index < maximum && pm_encoding_utf_8_char_width(source + index, (ptrdiff_t) (maximum - index)) == 0);
+
+                pm_strpbrk_invalid_multibyte_character(parser, source + start, source + index);
+            }
+        }
+    }
+
+    return NULL;
+}
+
+/**
+ * This is the path when the encoding is ASCII-8BIT.
+ */
+static inline const uint8_t *
+pm_strpbrk_ascii_8bit(pm_parser_t *parser, const uint8_t *source, const uint8_t *charset, size_t maximum, bool validate) {
+    size_t index = 0;
+
+    while (index < maximum) {
+        if (strchr((const char *) charset, source[index]) != NULL) {
+            return source + index;
+        }
+
+        if (validate && source[index] >= 0x80) pm_strpbrk_explicit_encoding_set(parser, source, 1);
+        index++;
+    }
+
+    return NULL;
+}
+
+/**
+ * This is the slow path that does care about the encoding.
+ */
+static inline const uint8_t *
+pm_strpbrk_multi_byte(pm_parser_t *parser, const uint8_t *source, const uint8_t *charset, size_t maximum, bool validate) {
+    size_t index = 0;
+    const pm_encoding_t *encoding = parser->encoding;
+
+    while (index < maximum) {
+        if (strchr((const char *) charset, source[index]) != NULL) {
+            return source + index;
+        }
+
+        if (source[index] < 0x80) {
+            index++;
+        } else {
+            size_t width = encoding->char_width(source + index, (ptrdiff_t) (maximum - index));
+            if (validate) pm_strpbrk_explicit_encoding_set(parser, source, width);
+
+            if (width > 0) {
+                index += width;
+            } else if (!validate) {
+                index++;
+            } else {
+                // At this point we know we have an invalid multibyte character.
+                // We'll walk forward as far as we can until we find the next
+                // valid character so that we don't spam the user with a ton of
+                // the same kind of error.
+                const size_t start = index;
+
+                do {
+                    index++;
+                } while (index < maximum && encoding->char_width(source + index, (ptrdiff_t) (maximum - index)) == 0);
+
+                pm_strpbrk_invalid_multibyte_character(parser, source + start, source + index);
+            }
+        }
+    }
+
+    return NULL;
+}
+
+/**
+ * This is the fast path that does not care about the encoding because we know
+ * the encoding only supports single-byte characters.
+ */
+static inline const uint8_t *
+pm_strpbrk_single_byte(pm_parser_t *parser, const uint8_t *source, const uint8_t *charset, size_t maximum, bool validate) {
+    size_t index = 0;
+    const pm_encoding_t *encoding = parser->encoding;
+
+    while (index < maximum) {
+        if (strchr((const char *) charset, source[index]) != NULL) {
+            return source + index;
+        }
+
+        if (source[index] < 0x80 || !validate) {
+            index++;
+        } else {
+            size_t width = encoding->char_width(source + index, (ptrdiff_t) (maximum - index));
+            pm_strpbrk_explicit_encoding_set(parser, source, width);
+
+            if (width > 0) {
+                index += width;
+            } else {
+                // At this point we know we have an invalid multibyte character.
+                // We'll walk forward as far as we can until we find the next
+                // valid character so that we don't spam the user with a ton of
+                // the same kind of error.
+                const size_t start = index;
+
+                do {
+                    index++;
+                } while (index < maximum && encoding->char_width(source + index, (ptrdiff_t) (maximum - index)) == 0);
+
+                pm_strpbrk_invalid_multibyte_character(parser, source + start, source + index);
+            }
+        }
+    }
+
+    return NULL;
+}
+
+/**
+ * Here we have rolled our own version of strpbrk. The standard library strpbrk
+ * has undefined behavior when the source string is not null-terminated. We want
+ * to support strings that are not null-terminated because pm_parse does not
+ * have the contract that the string is null-terminated. (This is desirable
+ * because it means the extension can call pm_parse with the result of a call to
+ * mmap).
+ *
+ * The standard library strpbrk also does not support passing a maximum length
+ * to search. We want to support this for the reason mentioned above, but we
+ * also don't want it to stop on null bytes. Ruby actually allows null bytes
+ * within strings, comments, regular expressions, etc. So we need to be able to
+ * skip past them.
+ *
+ * Finally, we want to support encodings wherein the charset could contain
+ * characters that are trailing bytes of multi-byte characters. For example, in
+ * Shift_JIS, the backslash character can be a trailing byte. In that case we
+ * need to take a slower path and iterate one multi-byte character at a time.
+ */
+const uint8_t *
+pm_strpbrk(pm_parser_t *parser, const uint8_t *source, const uint8_t *charset, ptrdiff_t length, bool validate) {
+    if (length <= 0) {
+        return NULL;
+    } else if (!parser->encoding_changed) {
+        return pm_strpbrk_utf8(parser, source, charset, (size_t) length, validate);
+    } else if (parser->encoding == PM_ENCODING_ASCII_8BIT_ENTRY) {
+        return pm_strpbrk_ascii_8bit(parser, source, charset, (size_t) length, validate);
+    } else if (parser->encoding->multibyte) {
+        return pm_strpbrk_multi_byte(parser, source, charset, (size_t) length, validate);
+    } else {
+        return pm_strpbrk_single_byte(parser, source, charset, (size_t) length, validate);
+    }
+}