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/* _PyUnicode_InsertThousandsGrouping() helper functions */

typedef struct {

const char *grouping;

char previous;

Py_ssize_t i; /* Where we're currently pointing in grouping. */

} GroupGenerator;

static void

GroupGenerator_init(GroupGenerator *self, const char *grouping)

{

self->grouping = grouping;

self->i = 0;

self->previous = 0;

}

/* Returns the next grouping, or 0 to signify end. */

static Py_ssize_t

GroupGenerator_next(GroupGenerator *self)

{

/* Note that we don't really do much error checking here. If a

grouping string contains just CHAR_MAX, for example, then just

terminate the generator. That shouldn't happen, but at least we

fail gracefully. */

switch (self->grouping[self->i]) {

case 0:

return self->previous;

case CHAR_MAX:

/* Stop the generator. */

return 0;

default: {

char ch = self->grouping[self->i];

self->previous = ch;

self->i++;

return (Py_ssize_t)ch;

}

/* Fill in some digits, leading zeros, and thousands separator. All

are optional, depending on when we're called. */

static void

InsertThousandsGrouping_fill(_PyUnicodeWriter *writer, Py_ssize_t *buffer_pos,

PyObject *digits, Py_ssize_t *digits_pos,

Py_ssize_t n_chars, Py_ssize_t n_zeros,

PyObject *thousands_sep, Py_ssize_t thousands_sep_len,

Py_UCS4 *maxchar)

{

if (!writer) {

/* if maxchar > 127, maxchar is already set */

if (*maxchar == 127 && thousands_sep) {

Py_UCS4 maxchar2 = PyUnicode_MAX_CHAR_VALUE(thousands_sep);

*maxchar = Py_MAX(*maxchar, maxchar2);

}

return;

}

if (thousands_sep) {

*buffer_pos -= thousands_sep_len;

/* Copy the thousands_sep chars into the buffer. */

_PyUnicode_FastCopyCharacters(writer->buffer, *buffer_pos,

thousands_sep, 0,

thousands_sep_len);

}

*buffer_pos -= n_chars;

*digits_pos -= n_chars;

_PyUnicode_FastCopyCharacters(writer->buffer, *buffer_pos,

digits, *digits_pos,

n_chars);

if (n_zeros) {

*buffer_pos -= n_zeros;

int kind = PyUnicode_KIND(writer->buffer);

void *data = PyUnicode_DATA(writer->buffer);

unicode_fill(kind, data, '0', *buffer_pos, n_zeros);

}

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