split counter style handling out of the box code
This commit is contained in:
parent
13c1b11317
commit
83ebc3bb8e
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@ -16,6 +16,7 @@ S_HTML := box_construct.c \
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imagemap.c \
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interaction.c \
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layout.c \
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list_counter_style.c \
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object.c \
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redraw.c \
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redraw_border.c \
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@ -47,6 +47,7 @@
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#include "html/box_special.h"
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#include "html/box_normalise.h"
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#include "html/form_internal.h"
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#include "html/list_counter_style.h"
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/**
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* Context for box tree construction
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@ -396,284 +397,13 @@ static unsigned int compute_list_marker_index(struct box *last)
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return last->list_marker->rows + 1;
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}
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/**
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* Roman numeral conversion
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* maximum length of a list marker
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*
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* \return The number of characters that are nesesary for full output
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* enough for 9,999,999,999,999,999,999 in decimal
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* or six characters for 3byte utf8
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*/
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static int
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ntoromannumeral(char *buf, const size_t maxlen, int value, const char *C)
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{
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const int S[] = { 0, 2, 4, 2, 4, 2, 4 };
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const int D[] = { 1000, 500, 100, 50, 10, 5, 1 };
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const size_t L = sizeof(D) / sizeof(int) - 1;
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size_t k = 0; /* index into output buffer */
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unsigned int i = 0; /* index into maps */
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int r, r2;
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while (value > 0) {
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if (D[i] <= value) {
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r = value / D[i];
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value = value - (r * D[i]);
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if (i < L) {
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/* lookahead */
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r2 = value / D[i+1];
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}
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if (i < L && r2 >= S[i+1]) {
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/* will violate repeat boundary on next pass */
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value = value - (r2 * D[i+1]);
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if (k < maxlen) buf[k++] = C[i+1];
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if (k < maxlen) buf[k++] = C[i-1];
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} else if (S[i] && r >= S[i]) {
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/* violated repeat boundary on this pass */
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if (k < maxlen) buf[k++] = C[i];
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if (k < maxlen) buf[k++] = C[i-1];
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} else {
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while (r-- > 0 && k < maxlen) {
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buf[k++] = C[i];
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}
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}
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}
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i++;
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}
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if (k < maxlen) {
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buf[k] = '\0';
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}
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return k;
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}
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/**
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* lower case roman numeral
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*/
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static int ntolcromannumeral(char *buf, const size_t maxlen, int value)
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{
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const char C[] = { 'm', 'd', 'c', 'l', 'x', 'v', 'i' };
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return ntoromannumeral(buf, maxlen, value, C);
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}
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/**
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* upper case roman numeral
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*/
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static int ntoucromannumeral(char *buf, const size_t maxlen, int value)
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{
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const char C[] = { 'M', 'D', 'C', 'L', 'X', 'V', 'I' };
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return ntoromannumeral(buf, maxlen, value, C);
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}
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/**
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* generate alphabet symbol values for latin and greek labelling
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*
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* fills array with alphabet values suitable for the input value
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*
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* \param ares Buffer to recive the converted values
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* \param alen the length of \a ares buffer
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* \param value The value to convert
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* \param slen The number of symbols in the alphabet
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* \return The length a complete conversion which may be larger than \a alen
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*/
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static size_t
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calc_alphabet_values(uint8_t *ares,
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const size_t alen,
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int value,
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unsigned char slen)
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{
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size_t idx = 0;
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uint8_t *first;
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uint8_t *last;
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/* generate alphabet values in ascending order */
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while (value > 0) {
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--value;
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if (idx < alen) ares[idx] = value % slen;
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idx++;
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value = value / slen;
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}
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/* put the values in decending order */
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first = ares;
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if (idx < alen) {
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last = first + (idx - 1);
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} else {
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last = first + (alen - 1);
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}
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while (first < last) {
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*first ^= *last;
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*last ^= *first;
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*first ^= *last;
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first++;
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last--;
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}
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return idx;
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}
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/**
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* maps alphabet values to output values with a symbol table
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*
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* Takes a list of alphabet values and for each one outputs the
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* compete symbol (in utf8) to an output buffer.
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*
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* \param buf The oputput buffer
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* \param buflen the length of \a buf
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* \param aval array of alphabet values
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* \param alen The number of values in \a alen
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* \param symtab The symbol table
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* \param symtablen The number of symbols in \a symtab
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* \return The number of bytes needed in the output buffer whichmay be
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* larger than \a buflen but the buffer will not be overrun
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*/
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static int
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map_aval_to_symbols(char *buf, const size_t buflen,
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const uint8_t *aval, const size_t alen,
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const char symtab[][4], const size_t symtablen)
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{
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size_t oidx;
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size_t aidx;
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int sidx;
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oidx = 0;
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for (aidx=0; aidx < alen; aidx++) {
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sidx=0;
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while ((sidx < 4) &&
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(symtab[aval[aidx]][sidx] != 0)) {
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if (oidx < buflen) {
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buf[oidx] = symtab[aval[aidx]][sidx];
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}
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oidx++;
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sidx++;
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}
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}
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return oidx;
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}
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static int ntolcalpha(char *buf, const size_t buflen, int value)
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{
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size_t alen;
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uint8_t aval[20];
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const char symtab[][4] = {
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"a", "b", "c", "d", "e", "f", "g", "h", "i", "j",
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"k", "l", "m", "n", "o", "p", "q", "r", "s", "t",
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"u", "v", "w", "x", "y", "z"
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};
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const size_t symtablen = sizeof(symtab) / 4;
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alen = calc_alphabet_values(aval, sizeof(aval), value, symtablen);
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if (alen >= sizeof(aval)) {
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*buf = '?';
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return 1;
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}
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return map_aval_to_symbols(buf, buflen, aval, alen, symtab, symtablen);
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}
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static int ntoucalpha(char *buf, const size_t buflen, int value)
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{
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size_t alen;
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uint8_t aval[20];
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const char symtab[][4] = {
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"A", "B", "C", "D", "E", "F", "G", "H", "I", "J",
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"K", "L", "M", "N", "O", "P", "Q", "R", "S", "T",
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"U", "V", "W", "X", "Y", "Z"
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};
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const size_t symtablen = sizeof(symtab) / 4;
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alen = calc_alphabet_values(aval, sizeof(aval), value, symtablen);
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if (alen >= sizeof(aval)) {
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*buf = '?';
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return 1;
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}
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return map_aval_to_symbols(buf, buflen, aval, alen, symtab, symtablen);
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}
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static int ntolcgreek(char *buf, const size_t buflen, int value)
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{
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size_t alen;
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uint8_t aval[20];
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const char symtab[][4] = {
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"α", "β", "γ", "δ", "ε", "ζ", "η", "θ", "ι", "κ",
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"λ", "μ", "ν", "ξ", "ο", "π", "ρ", "σ", "τ", "υ",
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"φ", "χ", "ψ", "ω"
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};
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const size_t symtablen = sizeof(symtab) / 4;
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alen = calc_alphabet_values(aval, sizeof(aval), value, symtablen);
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if (alen >= sizeof(aval)) {
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*buf = '?';
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return 1;
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}
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return map_aval_to_symbols(buf, buflen, aval, alen, symtab, symtablen);
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}
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/**
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* format value into a list marker with a style
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*
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* The value is a one based index into the list. This means for
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* numeric printing the value must be incremented by one.
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*/
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static size_t
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format_list_marker_value(char *text,
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size_t text_len,
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enum css_list_style_type_e list_style_type,
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unsigned int value)
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{
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int res = -1;
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switch (list_style_type) {
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case CSS_LIST_STYLE_TYPE_DECIMAL_LEADING_ZERO:
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res = snprintf(text, text_len, "%02u", value);
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break;
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case CSS_LIST_STYLE_TYPE_LOWER_ROMAN:
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res = ntolcromannumeral(text, text_len, value);
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break;
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case CSS_LIST_STYLE_TYPE_UPPER_ROMAN:
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res = ntoucromannumeral(text, text_len, value);
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break;
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case CSS_LIST_STYLE_TYPE_LOWER_ALPHA:
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case CSS_LIST_STYLE_TYPE_LOWER_LATIN:
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res = ntolcalpha(text, text_len, value);
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break;
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case CSS_LIST_STYLE_TYPE_UPPER_ALPHA:
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case CSS_LIST_STYLE_TYPE_UPPER_LATIN:
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res = ntoucalpha(text, text_len, value);
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break;
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case CSS_LIST_STYLE_TYPE_LOWER_GREEK:
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res = ntolcgreek(text, text_len, value);
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break;
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case CSS_LIST_STYLE_TYPE_ARMENIAN:
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case CSS_LIST_STYLE_TYPE_GEORGIAN:
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case CSS_LIST_STYLE_TYPE_DECIMAL:
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default:
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res = snprintf(text, text_len, "%u", value);
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break;
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}
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/* deal with error */
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if (res < 0) {
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text[0] = 0;
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return 0;
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}
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/* deal with overflow */
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if ((size_t)res >= (text_len-2)) {
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res = text_len-2;
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}
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text[res++] = '.';
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text[res++] = 0;
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return res;
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}
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#define LIST_MARKER_SIZE 20
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/**
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* Construct a list marker box
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@ -731,12 +461,12 @@ box_construct_marker(struct box *box,
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default:
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marker->rows = compute_list_marker_index(parent->last);
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marker->text = talloc_array(ctx->bctx, char, 20);
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marker->text = talloc_array(ctx->bctx, char, LIST_MARKER_SIZE);
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if (marker->text == NULL)
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return false;
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marker->length = format_list_marker_value(marker->text,
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20,
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marker->length = list_counter_style_value(marker->text,
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LIST_MARKER_SIZE,
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list_style_type,
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marker->rows);
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break;
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@ -0,0 +1,312 @@
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/*
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* Copyright 2021 Vincent Sanders <vince@netsurf-browser.org>
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*
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* This file is part of NetSurf, http://www.netsurf-browser.org/
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*
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* NetSurf is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* NetSurf is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* \file
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* Implementation of css list counter styling
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*/
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#include <stddef.h>
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#include <stdio.h>
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#include "css/select.h"
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#include "html/list_counter_style.h"
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/**
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* maps alphabet values to output values with a symbol table
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*
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* Takes a list of alphabet values and for each one outputs the
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* compete symbol (in utf8) to an output buffer.
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*
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* \param buf The oputput buffer
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* \param buflen the length of \a buf
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* \param aval array of alphabet values
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* \param alen The number of values in \a alen
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* \param symtab The symbol table
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* \param symtablen The number of symbols in \a symtab
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* \return The number of bytes needed in the output buffer whichmay be
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* larger than \a buflen but the buffer will not be overrun
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*/
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static int
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map_aval_to_symbols(char *buf, const size_t buflen,
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const uint8_t *aval, const size_t alen,
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const char symtab[][4], const size_t symtablen)
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{
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size_t oidx;
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size_t aidx;
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int sidx;
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oidx = 0;
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for (aidx=0; aidx < alen; aidx++) {
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sidx=0;
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while ((sidx < 4) &&
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(symtab[aval[aidx]][sidx] != 0)) {
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if (oidx < buflen) {
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buf[oidx] = symtab[aval[aidx]][sidx];
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}
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oidx++;
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sidx++;
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}
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}
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return oidx;
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}
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/**
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* generate alphabet symbol values for latin and greek labelling
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*
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* fills array with alphabet values suitable for the input value
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*
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* \param ares Buffer to recive the converted values
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* \param alen the length of \a ares buffer
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* \param value The value to convert
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* \param slen The number of symbols in the alphabet
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* \return The length a complete conversion which may be larger than \a alen
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*/
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static size_t
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calc_alphabet_values(uint8_t *ares,
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const size_t alen,
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int value,
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unsigned char slen)
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{
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size_t idx = 0;
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uint8_t *first;
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uint8_t *last;
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/* generate alphabet values in ascending order */
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while (value > 0) {
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--value;
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if (idx < alen) ares[idx] = value % slen;
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idx++;
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value = value / slen;
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}
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/* put the values in decending order */
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first = ares;
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if (idx < alen) {
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last = first + (idx - 1);
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} else {
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last = first + (alen - 1);
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}
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while (first < last) {
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*first ^= *last;
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*last ^= *first;
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*first ^= *last;
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first++;
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last--;
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}
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return idx;
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}
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/**
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* Roman numeral conversion
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*
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* \return The number of characters that are nesesary for full output
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*/
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static int
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ntoromannumeral(char *buf, const size_t maxlen, int value, const char *C)
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{
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const int S[] = { 0, 2, 4, 2, 4, 2, 4 };
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const int D[] = { 1000, 500, 100, 50, 10, 5, 1 };
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const size_t L = sizeof(D) / sizeof(int) - 1;
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size_t k = 0; /* index into output buffer */
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unsigned int i = 0; /* index into maps */
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int r, r2;
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while (value > 0) {
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if (D[i] <= value) {
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r = value / D[i];
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value = value - (r * D[i]);
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if (i < L) {
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/* lookahead */
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r2 = value / D[i+1];
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}
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if (i < L && r2 >= S[i+1]) {
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/* will violate repeat boundary on next pass */
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value = value - (r2 * D[i+1]);
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if (k < maxlen) buf[k++] = C[i+1];
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if (k < maxlen) buf[k++] = C[i-1];
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} else if (S[i] && r >= S[i]) {
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/* violated repeat boundary on this pass */
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if (k < maxlen) buf[k++] = C[i];
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if (k < maxlen) buf[k++] = C[i-1];
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} else {
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while (r-- > 0 && k < maxlen) {
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buf[k++] = C[i];
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}
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}
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}
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i++;
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}
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if (k < maxlen) {
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buf[k] = '\0';
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}
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return k;
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}
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/**
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* lower case roman numeral
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*/
|
||||
static int ntolcromannumeral(char *buf, const size_t maxlen, int value)
|
||||
{
|
||||
const char C[] = { 'm', 'd', 'c', 'l', 'x', 'v', 'i' };
|
||||
return ntoromannumeral(buf, maxlen, value, C);
|
||||
}
|
||||
|
||||
/**
|
||||
* upper case roman numeral
|
||||
*/
|
||||
static int ntoucromannumeral(char *buf, const size_t maxlen, int value)
|
||||
{
|
||||
const char C[] = { 'M', 'D', 'C', 'L', 'X', 'V', 'I' };
|
||||
return ntoromannumeral(buf, maxlen, value, C);
|
||||
}
|
||||
|
||||
|
||||
|
||||
|
||||
static int ntolcalpha(char *buf, const size_t buflen, int value)
|
||||
{
|
||||
size_t alen;
|
||||
uint8_t aval[20];
|
||||
const char symtab[][4] = {
|
||||
"a", "b", "c", "d", "e", "f", "g", "h", "i", "j",
|
||||
"k", "l", "m", "n", "o", "p", "q", "r", "s", "t",
|
||||
"u", "v", "w", "x", "y", "z"
|
||||
};
|
||||
const size_t symtablen = sizeof(symtab) / 4;
|
||||
|
||||
alen = calc_alphabet_values(aval, sizeof(aval), value, symtablen);
|
||||
if (alen >= sizeof(aval)) {
|
||||
*buf = '?';
|
||||
return 1;
|
||||
}
|
||||
|
||||
return map_aval_to_symbols(buf, buflen, aval, alen, symtab, symtablen);
|
||||
}
|
||||
|
||||
static int ntoucalpha(char *buf, const size_t buflen, int value)
|
||||
{
|
||||
size_t alen;
|
||||
uint8_t aval[20];
|
||||
const char symtab[][4] = {
|
||||
"A", "B", "C", "D", "E", "F", "G", "H", "I", "J",
|
||||
"K", "L", "M", "N", "O", "P", "Q", "R", "S", "T",
|
||||
"U", "V", "W", "X", "Y", "Z"
|
||||
};
|
||||
const size_t symtablen = sizeof(symtab) / 4;
|
||||
|
||||
alen = calc_alphabet_values(aval, sizeof(aval), value, symtablen);
|
||||
if (alen >= sizeof(aval)) {
|
||||
*buf = '?';
|
||||
return 1;
|
||||
}
|
||||
|
||||
return map_aval_to_symbols(buf, buflen, aval, alen, symtab, symtablen);
|
||||
}
|
||||
|
||||
static int ntolcgreek(char *buf, const size_t buflen, int value)
|
||||
{
|
||||
size_t alen;
|
||||
uint8_t aval[20];
|
||||
const char symtab[][4] = {
|
||||
"α", "β", "γ", "δ", "ε", "ζ", "η", "θ", "ι", "κ",
|
||||
"λ", "μ", "ν", "ξ", "ο", "π", "ρ", "σ", "τ", "υ",
|
||||
"φ", "χ", "ψ", "ω"
|
||||
};
|
||||
const size_t symtablen = sizeof(symtab) / 4;
|
||||
|
||||
alen = calc_alphabet_values(aval, sizeof(aval), value, symtablen);
|
||||
if (alen >= sizeof(aval)) {
|
||||
*buf = '?';
|
||||
return 1;
|
||||
}
|
||||
|
||||
return map_aval_to_symbols(buf, buflen, aval, alen, symtab, symtablen);
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* format value into a list marker with a style
|
||||
*
|
||||
* The value is a one based index into the list. This means for
|
||||
* numeric printing the value must be incremented by one.
|
||||
*/
|
||||
size_t
|
||||
list_counter_style_value(char *text,
|
||||
size_t text_len,
|
||||
enum css_list_style_type_e list_style_type,
|
||||
unsigned int value)
|
||||
{
|
||||
int res = -1;
|
||||
|
||||
switch (list_style_type) {
|
||||
case CSS_LIST_STYLE_TYPE_DECIMAL_LEADING_ZERO:
|
||||
res = snprintf(text, text_len, "%02u", value);
|
||||
break;
|
||||
|
||||
case CSS_LIST_STYLE_TYPE_LOWER_ROMAN:
|
||||
res = ntolcromannumeral(text, text_len, value);
|
||||
break;
|
||||
|
||||
case CSS_LIST_STYLE_TYPE_UPPER_ROMAN:
|
||||
res = ntoucromannumeral(text, text_len, value);
|
||||
break;
|
||||
|
||||
case CSS_LIST_STYLE_TYPE_LOWER_ALPHA:
|
||||
case CSS_LIST_STYLE_TYPE_LOWER_LATIN:
|
||||
res = ntolcalpha(text, text_len, value);
|
||||
break;
|
||||
|
||||
case CSS_LIST_STYLE_TYPE_UPPER_ALPHA:
|
||||
case CSS_LIST_STYLE_TYPE_UPPER_LATIN:
|
||||
res = ntoucalpha(text, text_len, value);
|
||||
break;
|
||||
|
||||
case CSS_LIST_STYLE_TYPE_LOWER_GREEK:
|
||||
res = ntolcgreek(text, text_len, value);
|
||||
break;
|
||||
|
||||
case CSS_LIST_STYLE_TYPE_ARMENIAN:
|
||||
case CSS_LIST_STYLE_TYPE_GEORGIAN:
|
||||
case CSS_LIST_STYLE_TYPE_DECIMAL:
|
||||
default:
|
||||
res = snprintf(text, text_len, "%u", value);
|
||||
break;
|
||||
}
|
||||
|
||||
/* deal with error */
|
||||
if (res < 0) {
|
||||
text[0] = 0;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* deal with overflow */
|
||||
if ((size_t)res >= (text_len-2)) {
|
||||
res = text_len-2;
|
||||
}
|
||||
text[res++] = '.';
|
||||
text[res++] = 0;
|
||||
|
||||
return res;
|
||||
}
|
|
@ -0,0 +1,45 @@
|
|||
/*
|
||||
* Copyright 2021 Vincent Sanders <vince@netsurf-browser.org>
|
||||
*
|
||||
* This file is part of NetSurf, http://www.netsurf-browser.org/
|
||||
*
|
||||
* NetSurf is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; version 2 of the License.
|
||||
*
|
||||
* NetSurf is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||||
*/
|
||||
|
||||
/**
|
||||
* \file
|
||||
* List counter style handling
|
||||
*
|
||||
* These functions provide font related services. They all work on
|
||||
* UTF-8 strings with lengths given.
|
||||
*/
|
||||
|
||||
#ifndef NETSURF_HTML_LIST_COUNTER_STYLE_H
|
||||
#define NETSURF_HTML_LIST_COUNTER_STYLE_H
|
||||
|
||||
/**
|
||||
* format value into a list marker with a style
|
||||
*
|
||||
* \param text The buffer to recive the output
|
||||
* \param text_len The length available in \a text
|
||||
* \param list_style_type The css list style type
|
||||
* \param value The value to style
|
||||
* \return The size of data placed in \a text
|
||||
*/
|
||||
size_t
|
||||
list_counter_style_value(char *text,
|
||||
size_t text_len,
|
||||
enum css_list_style_type_e list_style_type,
|
||||
unsigned int value);
|
||||
|
||||
#endif
|
Loading…
Reference in New Issue