Reorganize char_utils.h and basechars.h
* make BASE_CHARS[] const
* add several inline menthods for ASCII character handling
Change-Id: I49664f219af88faf0aef43ac350cfc216570b185
diff --git a/native/src/char_utils.h b/native/src/char_utils.h
index a69a35e..607dc51 100644
--- a/native/src/char_utils.h
+++ b/native/src/char_utils.h
@@ -19,8 +19,47 @@
namespace latinime {
+inline static int isAsciiUpper(unsigned short c) {
+ return c >= 'A' && c <= 'Z';
+}
+
+inline static unsigned short toAsciiLower(unsigned short c) {
+ return c - 'A' + 'a';
+}
+
+inline static int isAscii(unsigned short c) {
+ return c <= 127;
+}
+
unsigned short latin_tolower(unsigned short c);
+/**
+ * Table mapping most combined Latin, Greek, and Cyrillic characters
+ * to their base characters. If c is in range, BASE_CHARS[c] == c
+ * if c is not a combined character, or the base character if it
+ * is combined.
+ */
+
+static const int BASE_CHARS_SIZE = 0x0500;
+extern const unsigned short BASE_CHARS[BASE_CHARS_SIZE];
+
+inline static unsigned short toBaseChar(unsigned short c) {
+ if (c < BASE_CHARS_SIZE) {
+ return BASE_CHARS[c];
+ }
+ return c;
+}
+
+inline static unsigned short toBaseLowerCase(unsigned short c) {
+ c = toBaseChar(c);
+ if (isAsciiUpper(c)) {
+ return toAsciiLower(c);
+ } else if (isAscii(c)) {
+ return c;
+ }
+ return latin_tolower(c);
+}
+
} // namespace latinime
#endif // LATINIME_CHAR_UTILS_H