/* ------------------------------------------------------------------------

   unicodedata -- Provides access to the Unicode database.

   Data was extracted from the UnicodeData.txt file.
   The current version number is reported in the unidata_version constant.

   Written by Marc-Andre Lemburg (mal@lemburg.com).
   Modified for Python 2.0 by Fredrik Lundh (fredrik@pythonware.com)
   Modified by Martin v. Löwis (martin@v.loewis.de)

   Copyright (c) Corporation for National Research Initiatives.

   ------------------------------------------------------------------------ */

#include "Python.h"
#include "ucnhash.h"
#include "structmember.h"

/* character properties */

typedef struct {
    const unsigned char category;       /* index into
                                           _PyUnicode_CategoryNames */
    const unsigned char combining;      /* combining class value 0 - 255 */
    const unsigned char bidirectional;  /* index into
                                           _PyUnicode_BidirectionalNames */
    const unsigned char mirrored;       /* true if mirrored in bidir mode */
    const unsigned char east_asian_width;       /* index into
                                                   _PyUnicode_EastAsianWidth */
    const unsigned char normalization_quick_check; /* see is_normalized() */
} _PyUnicode_DatabaseRecord;

typedef struct change_record {
    /* sequence of fields should be the same as in merge_old_version */
    const unsigned char bidir_changed;
    const unsigned char category_changed;
    const unsigned char decimal_changed;
    const unsigned char mirrored_changed;
    const double numeric_changed;
} change_record;

/* data file generated by Tools/unicode/makeunicodedata.py */
#include "unicodedata_db.h"

static const _PyUnicode_DatabaseRecord*
_getrecord_ex(Py_UCS4 code)
{
    int index;
    if (code >= 0x110000)
        index = 0;
    else {
        index = index1[(code>>SHIFT)];
        index = index2[(index<<SHIFT)+(code&((1<<SHIFT)-1))];
    }

    return &_PyUnicode_Database_Records[index];
}

/* ------------- Previous-version API ------------------------------------- */
typedef struct previous_version {
    PyObject_HEAD
    const char *name;
    const change_record* (*getrecord)(Py_UCS4);
    Py_UCS4 (*normalization)(Py_UCS4);
} PreviousDBVersion;

#define get_old_record(self, v)    ((((PreviousDBVersion*)self)->getrecord)(v))

static PyMemberDef DB_members[] = {
        {"unidata_version", T_STRING, offsetof(PreviousDBVersion, name), READONLY},
        {NULL}
};

/* forward declaration */
static PyTypeObject UCD_Type;
#define UCD_Check(o) (Py_TYPE(o)==&UCD_Type)

static PyObject*
new_previous_version(const char*name, const change_record* (*getrecord)(Py_UCS4),
                     Py_UCS4 (*normalization)(Py_UCS4))
{
        PreviousDBVersion *self;
        self = PyObject_New(PreviousDBVersion, &UCD_Type);
        if (self == NULL)
                return NULL;
        self->name = name;
        self->getrecord = getrecord;
        self->normalization = normalization;
        return (PyObject*)self;
}


static Py_UCS4 getuchar(PyUnicodeObject *obj)
{
    if (PyUnicode_READY(obj))
        return (Py_UCS4)-1;
    if (PyUnicode_GET_LENGTH(obj) == 1) {
        if (PyUnicode_READY(obj))
            return (Py_UCS4)-1;
        return PyUnicode_READ_CHAR(obj, 0);
    }
    PyErr_SetString(PyExc_TypeError,
                    "need a single Unicode character as parameter");
    return (Py_UCS4)-1;
}

/* --- Module API --------------------------------------------------------- */

PyDoc_STRVAR(unicodedata_decimal__doc__,
"decimal(unichr[, default])\n\
\n\
Returns the decimal value assigned to the Unicode character unichr\n\
as integer. If no such value is defined, default is returned, or, if\n\
not given, ValueError is raised.");

static PyObject *
unicodedata_decimal(PyObject *self, PyObject *args)
{
    PyUnicodeObject *v;
    PyObject *defobj = NULL;
    int have_old = 0;
    long rc;
    Py_UCS4 c;

    if (!PyArg_ParseTuple(args, "O!|O:decimal", &PyUnicode_Type, &v, &defobj))
        return NULL;
    c = getuchar(v);
    if (c == (Py_UCS4)-1)
        return NULL;

    if (self && UCD_Check(self)) {
        const change_record *old = get_old_record(self, c);
        if (old->category_changed == 0) {
            /* unassigned */
            have_old = 1;
            rc = -1;
        }
        else if (old->decimal_changed != 0xFF) {
            have_old = 1;
            rc = old->decimal_changed;
        }
    }

    if (!have_old)
        rc = Py_UNICODE_TODECIMAL(c);
    if (rc < 0) {
        if (defobj == NULL) {
            PyErr_SetString(PyExc_ValueError,
                            "not a decimal");
            return NULL;
        }
        else {
            Py_INCREF(defobj);
            return defobj;
        }
    }
    return PyLong_FromLong(rc);
}

PyDoc_STRVAR(unicodedata_digit__doc__,
"digit(unichr[, default])\n\
\n\
Returns the digit value assigned to the Unicode character unichr as\n\
integer. If no such value is defined, default is returned, or, if\n\
not given, ValueError is raised.");

static PyObject *
unicodedata_digit(PyObject *self, PyObject *args)
{
    PyUnicodeObject *v;
    PyObject *defobj = NULL;
    long rc;
    Py_UCS4 c;

    if (!PyArg_ParseTuple(args, "O!|O:digit", &PyUnicode_Type, &v, &defobj))
        return NULL;
    c = getuchar(v);
    if (c == (Py_UCS4)-1)
        return NULL;
    rc = Py_UNICODE_TODIGIT(c);
    if (rc < 0) {
        if (defobj == NULL) {
            PyErr_SetString(PyExc_ValueError, "not a digit");
            return NULL;
        }
        else {
            Py_INCREF(defobj);
            return defobj;
        }
    }
    return PyLong_FromLong(rc);
}

PyDoc_STRVAR(unicodedata_numeric__doc__,
"numeric(unichr[, default])\n\
\n\
Returns the numeric value assigned to the Unicode character unichr\n\
as float. If no such value is defined, default is returned, or, if\n\
not given, ValueError is raised.");

static PyObject *
unicodedata_numeric(PyObject *self, PyObject *args)
{
    PyUnicodeObject *v;
    PyObject *defobj = NULL;
    int have_old = 0;
    double rc;
    Py_UCS4 c;

    if (!PyArg_ParseTuple(args, "O!|O:numeric", &PyUnicode_Type, &v, &defobj))
        return NULL;
    c = getuchar(v);
    if (c == (Py_UCS4)-1)
        return NULL;

    if (self && UCD_Check(self)) {
        const change_record *old = get_old_record(self, c);
        if (old->category_changed == 0) {
            /* unassigned */
            have_old = 1;
            rc = -1.0;
        }
        else if (old->decimal_changed != 0xFF) {
            have_old = 1;
            rc = old->decimal_changed;
        }
    }

    if (!have_old)
        rc = Py_UNICODE_TONUMERIC(c);
    if (rc == -1.0) {
        if (defobj == NULL) {
            PyErr_SetString(PyExc_ValueError, "not a numeric character");
            return NULL;
        }
        else {
            Py_INCREF(defobj);
            return defobj;
        }
    }
    return PyFloat_FromDouble(rc);
}

PyDoc_STRVAR(unicodedata_category__doc__,
"category(unichr)\n\
\n\
Returns the general category assigned to the Unicode character\n\
unichr as string.");

static PyObject *
unicodedata_category(PyObject *self, PyObject *args)
{
    PyUnicodeObject *v;
    int index;
    Py_UCS4 c;

    if (!PyArg_ParseTuple(args, "O!:category",
                          &PyUnicode_Type, &v))
        return NULL;
    c = getuchar(v);
    if (c == (Py_UCS4)-1)
        return NULL;
    index = (int) _getrecord_ex(c)->category;
    if (self && UCD_Check(self)) {
        const change_record *old = get_old_record(self, c);
        if (old->category_changed != 0xFF)
            index = old->category_changed;
    }
    return PyUnicode_FromString(_PyUnicode_CategoryNames[index]);
}

PyDoc_STRVAR(unicodedata_bidirectional__doc__,
"bidirectional(unichr)\n\
\n\
Returns the bidirectional class assigned to the Unicode character\n\
unichr as string. If no such value is defined, an empty string is\n\
returned.");

static PyObject *
unicodedata_bidirectional(PyObject *self, PyObject *args)
{
    PyUnicodeObject *v;
    int index;
    Py_UCS4 c;

    if (!PyArg_ParseTuple(args, "O!:bidirectional",
                          &PyUnicode_Type, &v))
        return NULL;
    c = getuchar(v);
    if (c == (Py_UCS4)-1)
        return NULL;
    index = (int) _getrecord_ex(c)->bidirectional;
    if (self && UCD_Check(self)) {
        const change_record *old = get_old_record(self, c);
        if (old->category_changed == 0)
            index = 0; /* unassigned */
        else if (old->bidir_changed != 0xFF)
            index = old->bidir_changed;
    }
    return PyUnicode_FromString(_PyUnicode_BidirectionalNames[index]);
}

PyDoc_STRVAR(unicodedata_combining__doc__,
"combining(unichr)\n\
\n\
Returns the canonical combining class assigned to the Unicode\n\
character unichr as integer. Returns 0 if no combining class is\n\
defined.");

static PyObject *
unicodedata_combining(PyObject *self, PyObject *args)
{
    PyUnicodeObject *v;
    int index;
    Py_UCS4 c;

    if (!PyArg_ParseTuple(args, "O!:combining",
                          &PyUnicode_Type, &v))
        return NULL;
    c = getuchar(v);
    if (c == (Py_UCS4)-1)
        return NULL;
    index = (int) _getrecord_ex(c)->combining;
    if (self && UCD_Check(self)) {
        const change_record *old = get_old_record(self, c);
        if (old->category_changed == 0)
            index = 0; /* unassigned */
    }
    return PyLong_FromLong(index);
}

PyDoc_STRVAR(unicodedata_mirrored__doc__,
"mirrored(unichr)\n\
\n\
Returns the mirrored property assigned to the Unicode character\n\
unichr as integer. Returns 1 if the character has been identified as\n\
a \"mirrored\" character in bidirectional text, 0 otherwise.");

static PyObject *
unicodedata_mirrored(PyObject *self, PyObject *args)
{
    PyUnicodeObject *v;
    int index;
    Py_UCS4 c;

    if (!PyArg_ParseTuple(args, "O!:mirrored",
                          &PyUnicode_Type, &v))
        return NULL;
    c = getuchar(v);
    if (c == (Py_UCS4)-1)
        return NULL;
    index = (int) _getrecord_ex(c)->mirrored;
    if (self && UCD_Check(self)) {
        const change_record *old = get_old_record(self, c);
        if (old->category_changed == 0)
            index = 0; /* unassigned */
        else if (old->mirrored_changed != 0xFF)
            index = old->mirrored_changed;
    }
    return PyLong_FromLong(index);
}

PyDoc_STRVAR(unicodedata_east_asian_width__doc__,
"east_asian_width(unichr)\n\
\n\
Returns the east asian width assigned to the Unicode character\n\
unichr as string.");

static PyObject *
unicodedata_east_asian_width(PyObject *self, PyObject *args)
{
    PyUnicodeObject *v;
    int index;
    Py_UCS4 c;

    if (!PyArg_ParseTuple(args, "O!:east_asian_width",
                          &PyUnicode_Type, &v))
        return NULL;
    c = getuchar(v);
    if (c == (Py_UCS4)-1)
        return NULL;
    index = (int) _getrecord_ex(c)->east_asian_width;
    if (self && UCD_Check(self)) {
        const change_record *old = get_old_record(self, c);
        if (old->category_changed == 0)
            index = 0; /* unassigned */
    }
    return PyUnicode_FromString(_PyUnicode_EastAsianWidthNames[index]);
}

PyDoc_STRVAR(unicodedata_decomposition__doc__,
"decomposition(unichr)\n\
\n\
Returns the character decomposition mapping assigned to the Unicode\n\
character unichr as string. An empty string is returned in case no\n\
such mapping is defined.");

static PyObject *
unicodedata_decomposition(PyObject *self, PyObject *args)
{
    PyUnicodeObject *v;
    char decomp[256];
    int code, index, count;
    size_t i;
    unsigned int prefix_index;
    Py_UCS4 c;

    if (!PyArg_ParseTuple(args, "O!:decomposition",
                          &PyUnicode_Type, &v))
        return NULL;
    c = getuchar(v);
    if (c == (Py_UCS4)-1)
        return NULL;

    code = (int)c;

    if (self && UCD_Check(self)) {
        const change_record *old = get_old_record(self, c);
        if (old->category_changed == 0)
            return PyUnicode_FromString(""); /* unassigned */
    }

    if (code < 0 || code >= 0x110000)
        index = 0;
    else {
        index = decomp_index1[(code>>DECOMP_SHIFT)];
        index = decomp_index2[(index<<DECOMP_SHIFT)+
                             (code&((1<<DECOMP_SHIFT)-1))];
    }

    /* high byte is number of hex bytes (usually one or two), low byte
       is prefix code (from*/
    count = decomp_data[index] >> 8;

    /* XXX: could allocate the PyString up front instead
       (strlen(prefix) + 5 * count + 1 bytes) */

    /* Based on how index is calculated above and decomp_data is generated
       from Tools/unicode/makeunicodedata.py, it should not be possible
       to overflow decomp_prefix. */
    prefix_index = decomp_data[index] & 255;
    assert(prefix_index < Py_ARRAY_LENGTH(decomp_prefix));

    /* copy prefix */
    i = strlen(decomp_prefix[prefix_index]);
    memcpy(decomp, decomp_prefix[prefix_index], i);

    while (count-- > 0) {
        if (i)
            decomp[i++] = ' ';
        assert(i < sizeof(decomp));
        PyOS_snprintf(decomp + i, sizeof(decomp) - i, "%04X",
                      decomp_data[++index]);
        i += strlen(decomp + i);
    }
    return PyUnicode_FromStringAndSize(decomp, i);
}

static void
get_decomp_record(PyObject *self, Py_UCS4 code, int *index, int *prefix, int *count)
{
    if (code >= 0x110000) {
        *index = 0;
    } else if (self && UCD_Check(self) &&
               get_old_record(self, code)->category_changed==0) {
        /* unassigned in old version */
        *index = 0;
    }
    else {
        *index = decomp_index1[(code>>DECOMP_SHIFT)];
        *index = decomp_index2[(*index<<DECOMP_SHIFT)+
                               (code&((1<<DECOMP_SHIFT)-1))];
    }

    /* high byte is number of hex bytes (usually one or two), low byte
       is prefix code (from*/
    *count = decomp_data[*index] >> 8;
    *prefix = decomp_data[*index] & 255;

    (*index)++;
}

#define SBase   0xAC00
#define LBase   0x1100
#define VBase   0x1161
#define TBase   0x11A7
#define LCount  19
#define VCount  21
#define TCount  28
#define NCount  (VCount*TCount)
#define SCount  (LCount*NCount)

static PyObject*
nfd_nfkd(PyObject *self, PyObject *input, int k)
{
    PyObject *result;
    Py_UCS4 *output;
    Py_ssize_t i, o, osize;
    int kind;
    void *data;
    /* Longest decomposition in Unicode 3.2: U+FDFA */
    Py_UCS4 stack[20];
    Py_ssize_t space, isize;
    int index, prefix, count, stackptr;
    unsigned char prev, cur;

    stackptr = 0;
    isize = PyUnicode_GET_LENGTH(input);
    space = isize;
    /* Overallocate at most 10 characters. */
    if (space > 10) {
        if (space <= PY_SSIZE_T_MAX - 10)
            space += 10;
    }
    else {
        space *= 2;
    }
    osize = space;
    output = PyMem_NEW(Py_UCS4, space);
    if (!output) {
        PyErr_NoMemory();
        return NULL;
    }
    i = o = 0;
    kind = PyUnicode_KIND(input);
    data = PyUnicode_DATA(input);

    while (i < isize) {
        stack[stackptr++] = PyUnicode_READ(kind, data, i++);
        while(stackptr) {
            Py_UCS4 code = stack[--stackptr];
            /* Hangul Decomposition adds three characters in
               a single step, so we need at least that much room. */
            if (space < 3) {
                Py_UCS4 *new_output;
                osize += 10;
                space += 10;
                new_output = PyMem_Realloc(output, osize*sizeof(Py_UCS4));
                if (new_output == NULL) {
                    PyMem_Free(output);
                    PyErr_NoMemory();
                    return NULL;
                }
                output = new_output;
            }
            /* Hangul Decomposition. */
            if (SBase <= code && code < (SBase+SCount)) {
                int SIndex = code - SBase;
                int L = LBase + SIndex / NCount;
                int V = VBase + (SIndex % NCount) / TCount;
                int T = TBase + SIndex % TCount;
                output[o++] = L;
                output[o++] = V;
                space -= 2;
                if (T != TBase) {
                    output[o++] = T;
                    space --;
                }
                continue;
            }
            /* normalization changes */
            if (self && UCD_Check(self)) {
                Py_UCS4 value = ((PreviousDBVersion*)self)->normalization(code);
                if (value != 0) {
                    stack[stackptr++] = value;
                    continue;
                }
            }

            /* Other decompositions. */
            get_decomp_record(self, code, &index, &prefix, &count);

            /* Copy character if it is not decomposable, or has a
               compatibility decomposition, but we do NFD. */
            if (!count || (prefix && !k)) {
                output[o++] = code;
                space--;
                continue;
            }
            /* Copy decomposition onto the stack, in reverse
               order.  */
            while(count) {
                code = decomp_data[index + (--count)];
                stack[stackptr++] = code;
            }
        }
    }

    result = PyUnicode_FromKindAndData(PyUnicode_4BYTE_KIND,
                                       output, o);
    PyMem_Free(output);
    if (!result)
        return NULL;
    /* result is guaranteed to be ready, as it is compact. */
    kind = PyUnicode_KIND(result);
    data = PyUnicode_DATA(result);

    /* Sort canonically. */
    i = 0;
    prev = _getrecord_ex(PyUnicode_READ(kind, data, i))->combining;
    for (i++; i < PyUnicode_GET_LENGTH(result); i++) {
        cur = _getrecord_ex(PyUnicode_READ(kind, data, i))->combining;
        if (prev == 0 || cur == 0 || prev <= cur) {
            prev = cur;
            continue;
        }
        /* Non-canonical order. Need to switch *i with previous. */
        o = i - 1;
        while (1) {
            Py_UCS4 tmp = PyUnicode_READ(kind, data, o+1);
            PyUnicode_WRITE(kind, data, o+1,
                            PyUnicode_READ(kind, data, o));
            PyUnicode_WRITE(kind, data, o, tmp);
            o--;
            if (o < 0)
                break;
            prev = _getrecord_ex(PyUnicode_READ(kind, data, o))->combining;
            if (prev == 0 || prev <= cur)
                break;
        }
        prev = _getrecord_ex(PyUnicode_READ(kind, data, i))->combining;
    }
    return result;
}

static int
find_nfc_index(PyObject *self, struct reindex* nfc, Py_UCS4 code)
{
    unsigned int index;
    for (index = 0; nfc[index].start; index++) {
        unsigned int start = nfc[index].start;
        if (code < start)
            return -1;
        if (code <= start + nfc[index].count) {
            unsigned int delta = code - start;
            return nfc[index].index + delta;
        }
    }
    return -1;
}

static PyObject*
nfc_nfkc(PyObject *self, PyObject *input, int k)
{
    PyObject *result;
    int kind;
    void *data;
    Py_UCS4 *output;
    Py_ssize_t i, i1, o, len;
    int f,l,index,index1,comb;
    Py_UCS4 code;
    Py_ssize_t skipped[20];
    int cskipped = 0;

    result = nfd_nfkd(self, input, k);
    if (!result)
        return NULL;
    /* result will be "ready". */
    kind = PyUnicode_KIND(result);
    data = PyUnicode_DATA(result);
    len = PyUnicode_GET_LENGTH(result);

    /* We allocate a buffer for the output.
       If we find that we made no changes, we still return
       the NFD result. */
    output = PyMem_NEW(Py_UCS4, len);
    if (!output) {
        PyErr_NoMemory();
        Py_DECREF(result);
        return 0;
    }
    i = o = 0;

  again:
    while (i < len) {
      for (index = 0; index < cskipped; index++) {
          if (skipped[index] == i) {
              /* *i character is skipped.
                 Remove from list. */
              skipped[index] = skipped[cskipped-1];
              cskipped--;
              i++;
              goto again; /* continue while */
          }
      }
      /* Hangul Composition. We don't need to check for <LV,T>
         pairs, since we always have decomposed data. */
      code = PyUnicode_READ(kind, data, i);
      if (LBase <= code && code < (LBase+LCount) &&
          i + 1 < len &&
          VBase <= PyUnicode_READ(kind, data, i+1) &&
          PyUnicode_READ(kind, data, i+1) <= (VBase+VCount)) {
          int LIndex, VIndex;
          LIndex = code - LBase;
          VIndex = PyUnicode_READ(kind, data, i+1) - VBase;
          code = SBase + (LIndex*VCount+VIndex)*TCount;
          i+=2;
          if (i < len &&
              TBase <= PyUnicode_READ(kind, data, i) &&
              PyUnicode_READ(kind, data, i) <= (TBase+TCount)) {
              code += PyUnicode_READ(kind, data, i)-TBase;
              i++;
          }
          output[o++] = code;
          continue;
      }

      /* code is still input[i] here */
      f = find_nfc_index(self, nfc_first, code);
      if (f == -1) {
          output[o++] = code;
          i++;
          continue;
      }
      /* Find next unblocked character. */
      i1 = i+1;
      comb = 0;
      /* output base character for now; might be updated later. */
      output[o] = PyUnicode_READ(kind, data, i);
      while (i1 < len) {
          Py_UCS4 code1 = PyUnicode_READ(kind, data, i1);
          int comb1 = _getrecord_ex(code1)->combining;
          if (comb) {
              if (comb1 == 0)
                  break;
              if (comb >= comb1) {
                  /* Character is blocked. */
                  i1++;
                  continue;
              }
          }
          l = find_nfc_index(self, nfc_last, code1);
          /* i1 cannot be combined with i. If i1
             is a starter, we don't need to look further.
             Otherwise, record the combining class. */
          if (l == -1) {
            not_combinable:
              if (comb1 == 0)
                  break;
              comb = comb1;
              i1++;
              continue;
          }
          index = f*TOTAL_LAST + l;
          index1 = comp_index[index >> COMP_SHIFT];
          code = comp_data[(index1<<COMP_SHIFT)+
                           (index&((1<<COMP_SHIFT)-1))];
          if (code == 0)
              goto not_combinable;

          /* Replace the original character. */
          output[o] = code;
          /* Mark the second character unused. */
          assert(cskipped < 20);
          skipped[cskipped++] = i1;
          i1++;
          f = find_nfc_index(self, nfc_first, output[o]);
          if (f == -1)
              break;
      }
      /* Output character was already written.
         Just advance the indices. */
      o++; i++;
    }
    if (o == len) {
        /* No changes. Return original string. */
        PyMem_Free(output);
        return result;
    }
    Py_DECREF(result);
    result = PyUnicode_FromKindAndData(PyUnicode_4BYTE_KIND,
                                       output, o);
    PyMem_Free(output);
    return result;
}

/* Return 1 if the input is certainly normalized, 0 if it might not be. */
static int
is_normalized(PyObject *self, PyObject *input, int nfc, int k)
{
    Py_ssize_t i, len;
    int kind;
    void *data;
    unsigned char prev_combining = 0, quickcheck_mask;

    /* An older version of the database is requested, quickchecks must be
       disabled. */
    if (self && UCD_Check(self))
        return 0;

    /* The two quickcheck bits at this shift mean 0=Yes, 1=Maybe, 2=No,
       as described in http://unicode.org/reports/tr15/#Annex8. */
    quickcheck_mask = 3 << ((nfc ? 4 : 0) + (k ? 2 : 0));

    i = 0;
    kind = PyUnicode_KIND(input);
    data = PyUnicode_DATA(input);
    len = PyUnicode_GET_LENGTH(input);
    while (i < len) {
        Py_UCS4 ch = PyUnicode_READ(kind, data, i++);
        const _PyUnicode_DatabaseRecord *record = _getrecord_ex(ch);
        unsigned char combining = record->combining;
        unsigned char quickcheck = record->normalization_quick_check;

        if (quickcheck & quickcheck_mask)
            return 0; /* this string might need normalization */
        if (combining && prev_combining > combining)
            return 0; /* non-canonical sort order, not normalized */
        prev_combining = combining;
    }
    return 1; /* certainly normalized */
}

PyDoc_STRVAR(unicodedata_normalize__doc__,
"normalize(form, unistr)\n\
\n\
Return the normal form 'form' for the Unicode string unistr.  Valid\n\
values for form are 'NFC', 'NFKC', 'NFD', and 'NFKD'.");

static PyObject*
unicodedata_normalize(PyObject *self, PyObject *args)
{
    char *form;
    PyObject *input;

    if(!PyArg_ParseTuple(args, "sO!:normalize",
                         &form, &PyUnicode_Type, &input))
        return NULL;

    if (PyUnicode_READY(input) == -1)
        return NULL;

    if (PyUnicode_GET_LENGTH(input) == 0) {
        /* Special case empty input strings, since resizing
           them  later would cause internal errors. */
        Py_INCREF(input);
        return input;
    }

    if (strcmp(form, "NFC") == 0) {
        if (is_normalized(self, input, 1, 0)) {
            Py_INCREF(input);
            return input;
        }
        return nfc_nfkc(self, input, 0);
    }
    if (strcmp(form, "NFKC") == 0) {
        if (is_normalized(self, input, 1, 1)) {
            Py_INCREF(input);
            return input;
        }
        return nfc_nfkc(self, input, 1);
    }
    if (strcmp(form, "NFD") == 0) {
        if (is_normalized(self, input, 0, 0)) {
            Py_INCREF(input);
            return input;
        }
        return nfd_nfkd(self, input, 0);
    }
    if (strcmp(form, "NFKD") == 0) {
        if (is_normalized(self, input, 0, 1)) {
            Py_INCREF(input);
            return input;
        }
        return nfd_nfkd(self, input, 1);
    }
    PyErr_SetString(PyExc_ValueError, "invalid normalization form");
    return NULL;
}

/* -------------------------------------------------------------------- */
/* unicode character name tables */

/* data file generated by Tools/unicode/makeunicodedata.py */
#include "unicodename_db.h"

/* -------------------------------------------------------------------- */
/* database code (cut and pasted from the unidb package) */

static unsigned long
_gethash(const char *s, int len, int scale)
{
    int i;
    unsigned long h = 0;
    unsigned long ix;
    for (i = 0; i < len; i++) {
        h = (h * scale) + (unsigned char) Py_TOUPPER(Py_CHARMASK(s[i]));
        ix = h & 0xff000000;
        if (ix)
            h = (h ^ ((ix>>24) & 0xff)) & 0x00ffffff;
    }
    return h;
}

static char *hangul_syllables[][3] = {
    { "G",  "A",   ""   },
    { "GG", "AE",  "G"  },
    { "N",  "YA",  "GG" },
    { "D",  "YAE", "GS" },
    { "DD", "EO",  "N", },
    { "R",  "E",   "NJ" },
    { "M",  "YEO", "NH" },
    { "B",  "YE",  "D"  },
    { "BB", "O",   "L"  },
    { "S",  "WA",  "LG" },
    { "SS", "WAE", "LM" },
    { "",   "OE",  "LB" },
    { "J",  "YO",  "LS" },
    { "JJ", "U",   "LT" },
    { "C",  "WEO", "LP" },
    { "K",  "WE",  "LH" },
    { "T",  "WI",  "M"  },
    { "P",  "YU",  "B"  },
    { "H",  "EU",  "BS" },
    { 0,    "YI",  "S"  },
    { 0,    "I",   "SS" },
    { 0,    0,     "NG" },
    { 0,    0,     "J"  },
    { 0,    0,     "C"  },
    { 0,    0,     "K"  },
    { 0,    0,     "T"  },
    { 0,    0,     "P"  },
    { 0,    0,     "H"  }
};

/* These ranges need to match makeunicodedata.py:cjk_ranges. */
static int
is_unified_ideograph(Py_UCS4 code)
{
    return
        (0x3400 <= code && code <= 0x4DB5)   || /* CJK Ideograph Extension A */
        (0x4E00 <= code && code <= 0x9FCC)   || /* CJK Ideograph */
        (0x20000 <= code && code <= 0x2A6D6) || /* CJK Ideograph Extension B */
        (0x2A700 <= code && code <= 0x2B734) || /* CJK Ideograph Extension C */
        (0x2B740 <= code && code <= 0x2B81D);   /* CJK Ideograph Extension D */
}

/* macros used to determine if the given codepoint is in the PUA range that
 * we are using to store aliases and named sequences */
#define IS_ALIAS(cp) ((cp >= aliases_start) && (cp < aliases_end))
#define IS_NAMED_SEQ(cp) ((cp >= named_sequences_start) && \
                          (cp < named_sequences_end))

static int
_getucname(PyObject *self, Py_UCS4 code, char* buffer, int buflen,
           int with_alias_and_seq)
{
    /* Find the name associated with the given codepoint.
     * If with_alias_and_seq is 1, check for names in the Private Use Area 15
     * that we are using for aliases and named sequences. */
    int offset;
    int i;
    int word;
    unsigned char* w;

    if (code >= 0x110000)
        return 0;

    /* XXX should we just skip all the codepoints in the PUAs here? */
    if (!with_alias_and_seq && (IS_ALIAS(code) || IS_NAMED_SEQ(code)))
        return 0;

    if (self && UCD_Check(self)) {
        /* in 3.2.0 there are no aliases and named sequences */
        const change_record *old;
        if (IS_ALIAS(code) || IS_NAMED_SEQ(code))
            return 0;
        old = get_old_record(self, code);
        if (old->category_changed == 0) {
            /* unassigned */
            return 0;
        }
    }

    if (SBase <= code && code < SBase+SCount) {
        /* Hangul syllable. */
        int SIndex = code - SBase;
        int L = SIndex / NCount;
        int V = (SIndex % NCount) / TCount;
        int T = SIndex % TCount;

        if (buflen < 27)
            /* Worst case: HANGUL SYLLABLE <10chars>. */
            return 0;
        strcpy(buffer, "HANGUL SYLLABLE ");
        buffer += 16;
        strcpy(buffer, hangul_syllables[L][0]);
        buffer += strlen(hangul_syllables[L][0]);
        strcpy(buffer, hangul_syllables[V][1]);
        buffer += strlen(hangul_syllables[V][1]);
        strcpy(buffer, hangul_syllables[T][2]);
        buffer += strlen(hangul_syllables[T][2]);
        *buffer = '\0';
        return 1;
    }

    if (is_unified_ideograph(code)) {
        if (buflen < 28)
            /* Worst case: CJK UNIFIED IDEOGRAPH-20000 */
            return 0;
        sprintf(buffer, "CJK UNIFIED IDEOGRAPH-%X", code);
        return 1;
    }

    /* get offset into phrasebook */
    offset = phrasebook_offset1[(code>>phrasebook_shift)];
    offset = phrasebook_offset2[(offset<<phrasebook_shift) +
                               (code&((1<<phrasebook_shift)-1))];
    if (!offset)
        return 0;

    i = 0;

    for (;;) {
        /* get word index */
        word = phrasebook[offset] - phrasebook_short;
        if (word >= 0) {
            word = (word << 8) + phrasebook[offset+1];
            offset += 2;
        } else
            word = phrasebook[offset++];
        if (i) {
            if (i > buflen)
                return 0; /* buffer overflow */
            buffer[i++] = ' ';
        }
        /* copy word string from lexicon.  the last character in the
           word has bit 7 set.  the last word in a string ends with
           0x80 */
        w = lexicon + lexicon_offset[word];
        while (*w < 128) {
            if (i >= buflen)
                return 0; /* buffer overflow */
            buffer[i++] = *w++;
        }
        if (i >= buflen)
            return 0; /* buffer overflow */
        buffer[i++] = *w & 127;
        if (*w == 128)
            break; /* end of word */
    }

    return 1;
}

static int
_cmpname(PyObject *self, int code, const char* name, int namelen)
{
    /* check if code corresponds to the given name */
    int i;
    char buffer[NAME_MAXLEN];
    if (!_getucname(self, code, buffer, sizeof(buffer), 1))
        return 0;
    for (i = 0; i < namelen; i++) {
        if (Py_TOUPPER(Py_CHARMASK(name[i])) != buffer[i])
            return 0;
    }
    return buffer[namelen] == '\0';
}

static void
find_syllable(const char *str, int *len, int *pos, int count, int column)
{
    int i, len1;
    *len = -1;
    for (i = 0; i < count; i++) {
        char *s = hangul_syllables[i][column];
        len1 = Py_SAFE_DOWNCAST(strlen(s), size_t, int);
        if (len1 <= *len)
            continue;
        if (strncmp(str, s, len1) == 0) {
            *len = len1;
            *pos = i;
        }
    }
    if (*len == -1) {
        *len = 0;
    }
}

static int
_check_alias_and_seq(unsigned int cp, Py_UCS4* code, int with_named_seq)
{
    /* check if named sequences are allowed */
    if (!with_named_seq && IS_NAMED_SEQ(cp))
        return 0;
    /* if the codepoint is in the PUA range that we use for aliases,
     * convert it to obtain the right codepoint */
    if (IS_ALIAS(cp))
        *code = name_aliases[cp-aliases_start];
    else
        *code = cp;
    return 1;
}

static int
_getcode(PyObject* self, const char* name, int namelen, Py_UCS4* code,
         int with_named_seq)
{
    /* Return the codepoint associated with the given name.
     * Named aliases are resolved too (unless self != NULL (i.e. we are using
     * 3.2.0)).  If with_named_seq is 1, returns the PUA codepoint that we are
     * using for the named sequence, and the caller must then convert it. */
    unsigned int h, v;
    unsigned int mask = code_size-1;
    unsigned int i, incr;

    /* Check for hangul syllables. */
    if (strncmp(name, "HANGUL SYLLABLE ", 16) == 0) {
        int len, L = -1, V = -1, T = -1;
        const char *pos = name + 16;
        find_syllable(pos, &len, &L, LCount, 0);
        pos += len;
        find_syllable(pos, &len, &V, VCount, 1);
        pos += len;
        find_syllable(pos, &len, &T, TCount, 2);
        pos += len;
        if (L != -1 && V != -1 && T != -1 && pos-name == namelen) {
            *code = SBase + (L*VCount+V)*TCount + T;
            return 1;
        }
        /* Otherwise, it's an illegal syllable name. */
        return 0;
    }

    /* Check for unified ideographs. */
    if (strncmp(name, "CJK UNIFIED IDEOGRAPH-", 22) == 0) {
        /* Four or five hexdigits must follow. */
        v = 0;
        name += 22;
        namelen -= 22;
        if (namelen != 4 && namelen != 5)
            return 0;
        while (namelen--) {
            v *= 16;
            if (*name >= '0' && *name <= '9')
                v += *name - '0';
            else if (*name >= 'A' && *name <= 'F')
                v += *name - 'A' + 10;
            else
                return 0;
            name++;
        }
        if (!is_unified_ideograph(v))
            return 0;
        *code = v;
        return 1;
    }

    /* the following is the same as python's dictionary lookup, with
       only minor changes.  see the makeunicodedata script for more
       details */

    h = (unsigned int) _gethash(name, namelen, code_magic);
    i = (~h) & mask;
    v = code_hash[i];
    if (!v)
        return 0;
    if (_cmpname(self, v, name, namelen))
        return _check_alias_and_seq(v, code, with_named_seq);
    incr = (h ^ (h >> 3)) & mask;
    if (!incr)
        incr = mask;
    for (;;) {
        i = (i + incr) & mask;
        v = code_hash[i];
        if (!v)
            return 0;
        if (_cmpname(self, v, name, namelen))
            return _check_alias_and_seq(v, code, with_named_seq);
        incr = incr << 1;
        if (incr > mask)
            incr = incr ^ code_poly;
    }
}

static const _PyUnicode_Name_CAPI hashAPI =
{
    sizeof(_PyUnicode_Name_CAPI),
    _getucname,
    _getcode
};

/* -------------------------------------------------------------------- */
/* Python bindings */

PyDoc_STRVAR(unicodedata_name__doc__,
"name(unichr[, default])\n\
Returns the name assigned to the Unicode character unichr as a\n\
string. If no name is defined, default is returned, or, if not\n\
given, ValueError is raised.");

static PyObject *
unicodedata_name(PyObject* self, PyObject* args)
{
    char name[NAME_MAXLEN];
    Py_UCS4 c;

    PyUnicodeObject* v;
    PyObject* defobj = NULL;
    if (!PyArg_ParseTuple(args, "O!|O:name", &PyUnicode_Type, &v, &defobj))
        return NULL;

    c = getuchar(v);
    if (c == (Py_UCS4)-1)
        return NULL;

    if (!_getucname(self, c, name, sizeof(name), 0)) {
        if (defobj == NULL) {
            PyErr_SetString(PyExc_ValueError, "no such name");
            return NULL;
        }
        else {
            Py_INCREF(defobj);
            return defobj;
        }
    }

    return PyUnicode_FromString(name);
}

PyDoc_STRVAR(unicodedata_lookup__doc__,
"lookup(name)\n\
\n\
Look up character by name.  If a character with the\n\
given name is found, return the corresponding Unicode\n\
character.  If not found, KeyError is raised.");

static PyObject *
unicodedata_lookup(PyObject* self, PyObject* args)
{
    Py_UCS4 code;

    char* name;
    int namelen;
    unsigned int index;
    if (!PyArg_ParseTuple(args, "s#:lookup", &name, &namelen))
        return NULL;

    if (!_getcode(self, name, namelen, &code, 1)) {
        PyErr_Format(PyExc_KeyError, "undefined character name '%s'", name);
        return NULL;
    }
    /* check if code is in the PUA range that we use for named sequences
       and convert it */
    if (IS_NAMED_SEQ(code)) {
        index = code-named_sequences_start;
        return PyUnicode_FromKindAndData(PyUnicode_2BYTE_KIND,
                                         named_sequences[index].seq,
                                         named_sequences[index].seqlen);
    }
    return PyUnicode_FromOrdinal(code);
}

/* XXX Add doc strings. */

static PyMethodDef unicodedata_functions[] = {
    {"decimal", unicodedata_decimal, METH_VARARGS, unicodedata_decimal__doc__},
    {"digit", unicodedata_digit, METH_VARARGS, unicodedata_digit__doc__},
    {"numeric", unicodedata_numeric, METH_VARARGS, unicodedata_numeric__doc__},
    {"category", unicodedata_category, METH_VARARGS,
                 unicodedata_category__doc__},
    {"bidirectional", unicodedata_bidirectional, METH_VARARGS,
                      unicodedata_bidirectional__doc__},
    {"combining", unicodedata_combining, METH_VARARGS,
                  unicodedata_combining__doc__},
    {"mirrored", unicodedata_mirrored, METH_VARARGS,
                 unicodedata_mirrored__doc__},
    {"east_asian_width", unicodedata_east_asian_width, METH_VARARGS,
                         unicodedata_east_asian_width__doc__},
    {"decomposition", unicodedata_decomposition, METH_VARARGS,
                      unicodedata_decomposition__doc__},
    {"name", unicodedata_name, METH_VARARGS, unicodedata_name__doc__},
    {"lookup", unicodedata_lookup, METH_VARARGS, unicodedata_lookup__doc__},
    {"normalize", unicodedata_normalize, METH_VARARGS,
                  unicodedata_normalize__doc__},
    {NULL, NULL}                /* sentinel */
};

static PyTypeObject UCD_Type = {
        /* The ob_type field must be initialized in the module init function
         * to be portable to Windows without using C++. */
        PyVarObject_HEAD_INIT(NULL, 0)
        "unicodedata.UCD",              /*tp_name*/
        sizeof(PreviousDBVersion),      /*tp_basicsize*/
        0,                      /*tp_itemsize*/
        /* methods */
        (destructor)PyObject_Del, /*tp_dealloc*/
        0,                      /*tp_print*/
        0,                      /*tp_getattr*/
        0,                      /*tp_setattr*/
        0,                      /*tp_reserved*/
        0,                      /*tp_repr*/
        0,                      /*tp_as_number*/
        0,                      /*tp_as_sequence*/
        0,                      /*tp_as_mapping*/
        0,                      /*tp_hash*/
        0,                      /*tp_call*/
        0,                      /*tp_str*/
        PyObject_GenericGetAttr,/*tp_getattro*/
        0,                      /*tp_setattro*/
        0,                      /*tp_as_buffer*/
        Py_TPFLAGS_DEFAULT,     /*tp_flags*/
        0,                      /*tp_doc*/
        0,                      /*tp_traverse*/
        0,                      /*tp_clear*/
        0,                      /*tp_richcompare*/
        0,                      /*tp_weaklistoffset*/
        0,                      /*tp_iter*/
        0,                      /*tp_iternext*/
        unicodedata_functions,  /*tp_methods*/
        DB_members,             /*tp_members*/
        0,                      /*tp_getset*/
        0,                      /*tp_base*/
        0,                      /*tp_dict*/
        0,                      /*tp_descr_get*/
        0,                      /*tp_descr_set*/
        0,                      /*tp_dictoffset*/
        0,                      /*tp_init*/
        0,                      /*tp_alloc*/
        0,                      /*tp_new*/
        0,                      /*tp_free*/
        0,                      /*tp_is_gc*/
};

PyDoc_STRVAR(unicodedata_docstring,
"This module provides access to the Unicode Character Database which\n\
defines character properties for all Unicode characters. The data in\n\
this database is based on the UnicodeData.txt file version\n\
" UNIDATA_VERSION " which is publically available from ftp://ftp.unicode.org/.\n\
\n\
The module uses the same names and symbols as defined by the\n\
UnicodeData File Format " UNIDATA_VERSION ".");


static struct PyModuleDef unicodedatamodule = {
        PyModuleDef_HEAD_INIT,
        "unicodedata",
        unicodedata_docstring,
        -1,
        unicodedata_functions,
        NULL,
        NULL,
        NULL,
        NULL
};

PyMODINIT_FUNC
PyInit_unicodedata(void)
{
    PyObject *m, *v;

    Py_TYPE(&UCD_Type) = &PyType_Type;

    m = PyModule_Create(&unicodedatamodule);
    if (!m)
        return NULL;

    PyModule_AddStringConstant(m, "unidata_version", UNIDATA_VERSION);
    Py_INCREF(&UCD_Type);
    PyModule_AddObject(m, "UCD", (PyObject*)&UCD_Type);

    /* Previous versions */
    v = new_previous_version("3.2.0", get_change_3_2_0, normalization_3_2_0);
    if (v != NULL)
        PyModule_AddObject(m, "ucd_3_2_0", v);

    /* Export C API */
    v = PyCapsule_New((void *)&hashAPI, PyUnicodeData_CAPSULE_NAME, NULL);
    if (v != NULL)
        PyModule_AddObject(m, "ucnhash_CAPI", v);
    return m;
}

/*
Local variables:
c-basic-offset: 4
indent-tabs-mode: nil
End:
*/