add circuitpython code

1 files changed, 211 insertions, 0 deletions

diff --git a/circuitpython/py/unicode.c b/circuitpython/py/unicode.c
new file mode 100644
index 0000000..4028af5
--- /dev/null
+++ b/circuitpython/py/unicode.c
@@ -0,0 +1,211 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * SPDX-FileCopyrightText: Copyright (c) 2013, 2014 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <stdint.h>
+
+#include "py/unicode.h"
+
+// attribute flags
+#define FL_PRINT (0x01)
+#define FL_SPACE (0x02)
+#define FL_DIGIT (0x04)
+#define FL_ALPHA (0x08)
+#define FL_UPPER (0x10)
+#define FL_LOWER (0x20)
+#define FL_XDIGIT (0x40)
+
+// shorthand character attributes
+#define AT_PR (FL_PRINT)
+#define AT_SP (FL_SPACE | FL_PRINT)
+#define AT_DI (FL_DIGIT | FL_PRINT | FL_XDIGIT)
+#define AT_AL (FL_ALPHA | FL_PRINT)
+#define AT_UP (FL_UPPER | FL_ALPHA | FL_PRINT)
+#define AT_LO (FL_LOWER | FL_ALPHA | FL_PRINT)
+#define AT_UX (FL_UPPER | FL_ALPHA | FL_PRINT | FL_XDIGIT)
+#define AT_LX (FL_LOWER | FL_ALPHA | FL_PRINT | FL_XDIGIT)
+
+// table of attributes for ascii characters
+STATIC const uint8_t attr[] = {
+    0, 0, 0, 0, 0, 0, 0, 0,
+    0, AT_SP, AT_SP, AT_SP, AT_SP, AT_SP, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0,
+    AT_SP, AT_PR, AT_PR, AT_PR, AT_PR, AT_PR, AT_PR, AT_PR,
+    AT_PR, AT_PR, AT_PR, AT_PR, AT_PR, AT_PR, AT_PR, AT_PR,
+    AT_DI, AT_DI, AT_DI, AT_DI, AT_DI, AT_DI, AT_DI, AT_DI,
+    AT_DI, AT_DI, AT_PR, AT_PR, AT_PR, AT_PR, AT_PR, AT_PR,
+    AT_PR, AT_UX, AT_UX, AT_UX, AT_UX, AT_UX, AT_UX, AT_UP,
+    AT_UP, AT_UP, AT_UP, AT_UP, AT_UP, AT_UP, AT_UP, AT_UP,
+    AT_UP, AT_UP, AT_UP, AT_UP, AT_UP, AT_UP, AT_UP, AT_UP,
+    AT_UP, AT_UP, AT_UP, AT_PR, AT_PR, AT_PR, AT_PR, AT_PR,
+    AT_PR, AT_LX, AT_LX, AT_LX, AT_LX, AT_LX, AT_LX, AT_LO,
+    AT_LO, AT_LO, AT_LO, AT_LO, AT_LO, AT_LO, AT_LO, AT_LO,
+    AT_LO, AT_LO, AT_LO, AT_LO, AT_LO, AT_LO, AT_LO, AT_LO,
+    AT_LO, AT_LO, AT_LO, AT_PR, AT_PR, AT_PR, AT_PR, 0
+};
+
+#if MICROPY_PY_BUILTINS_STR_UNICODE
+
+unichar utf8_get_char(const byte *s) {
+    unichar ord = *s++;
+    if (!UTF8_IS_NONASCII(ord)) {
+        return ord;
+    }
+    ord &= 0x7F;
+    for (unichar mask = 0x40; ord & mask; mask >>= 1) {
+        ord &= ~mask;
+    }
+    while (UTF8_IS_CONT(*s)) {
+        ord = (ord << 6) | (*s++ & 0x3F);
+    }
+    return ord;
+}
+
+const byte *utf8_next_char(const byte *s) {
+    ++s;
+    while (UTF8_IS_CONT(*s)) {
+        ++s;
+    }
+    return s;
+}
+
+mp_uint_t utf8_ptr_to_index(const byte *s, const byte *ptr) {
+    mp_uint_t i = 0;
+    while (ptr > s) {
+        if (!UTF8_IS_CONT(*--ptr)) {
+            i++;
+        }
+    }
+
+    return i;
+}
+
+size_t utf8_charlen(const byte *str, size_t len) {
+    size_t charlen = 0;
+    for (const byte *top = str + len; str < top; ++str) {
+        if (!UTF8_IS_CONT(*str)) {
+            ++charlen;
+        }
+    }
+    return charlen;
+}
+
+#endif
+
+// Be aware: These unichar_is* functions are actually ASCII-only!
+bool unichar_isspace(unichar c) {
+    return c < 128 && (attr[c] & FL_SPACE) != 0;
+}
+
+bool unichar_isalpha(unichar c) {
+    return c < 128 && (attr[c] & FL_ALPHA) != 0;
+}
+
+/* unused
+bool unichar_isprint(unichar c) {
+    return c < 128 && (attr[c] & FL_PRINT) != 0;
+}
+*/
+
+bool unichar_isdigit(unichar c) {
+    return c < 128 && (attr[c] & FL_DIGIT) != 0;
+}
+
+bool unichar_isxdigit(unichar c) {
+    return c < 128 && (attr[c] & FL_XDIGIT) != 0;
+}
+
+bool unichar_isident(unichar c) {
+    return c < 128 && ((attr[c] & (FL_ALPHA | FL_DIGIT)) != 0 || c == '_');
+}
+
+bool unichar_isalnum(unichar c) {
+    return c < 128 && ((attr[c] & (FL_ALPHA | FL_DIGIT)) != 0);
+}
+
+bool unichar_isupper(unichar c) {
+    return c < 128 && (attr[c] & FL_UPPER) != 0;
+}
+
+bool unichar_islower(unichar c) {
+    return c < 128 && (attr[c] & FL_LOWER) != 0;
+}
+
+unichar unichar_tolower(unichar c) {
+    if (unichar_isupper(c)) {
+        return c + 0x20;
+    }
+    return c;
+}
+
+unichar unichar_toupper(unichar c) {
+    if (unichar_islower(c)) {
+        return c - 0x20;
+    }
+    return c;
+}
+
+mp_uint_t unichar_xdigit_value(unichar c) {
+    // c is assumed to be hex digit
+    mp_uint_t n = c - '0';
+    if (n > 9) {
+        n &= ~('a' - 'A');
+        n -= ('A' - ('9' + 1));
+    }
+    return n;
+}
+
+#if MICROPY_PY_BUILTINS_STR_UNICODE
+
+bool utf8_check(const byte *p, size_t len) {
+    uint8_t need = 0;
+    const byte *end = p + len;
+    for (; p < end; p++) {
+        byte c = *p;
+        if (need) {
+            if (UTF8_IS_CONT(c)) {
+                need--;
+            } else {
+                // mismatch
+                return 0;
+            }
+        } else {
+            if (c >= 0xc0) {
+                if (c >= 0xf8) {
+                    // mismatch
+                    return 0;
+                }
+                need = (0xe5 >> ((c >> 3) & 0x6)) & 3;
+            } else if (c >= 0x80) {
+                // mismatch
+                return 0;
+            }
+        }
+    }
+    return need == 0; // no pending fragments allowed
+}
+
+#endif