84 lines
1.8 KiB
C
84 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#include <stdlib.h>
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#include <string.h>
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#include "transliteration.h"
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#include "syllable.h"
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#include "utf8.h"
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static const struct transliteration_letter *find_letter_by_code(unsigned int c,
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const struct transliteration_letter *table)
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{
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const struct transliteration_letter *walk = table;
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if (c == 0)
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return NULL;
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while (walk->code != 0) {
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if (c == walk->code)
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return walk;
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walk++;
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}
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return NULL;
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}
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static void syllable_modify(struct syllable *syllable, const char *data)
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{
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char buffer[10];
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if (syllable == NULL)
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return;
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strcpy(buffer, syllable->data);
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buffer[strlen(buffer) - 1] = 0;
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strcat(buffer, data);
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free(syllable->data);
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syllable->data = strdup(buffer);
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}
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static void apply_transliteration_filters(struct syllable *head,
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const transliteration_filter_t *filters)
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{
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const transliteration_filter_t *filter = filters;
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while (*filter) {
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(*filter)(head);
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filter++;
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}
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}
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char *transliterate_devanagari_to_latin(const char *devanagari,
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const struct transliteration_context *context)
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{
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struct syllable *head = NULL, *tail = NULL, **indirect = &head;
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const struct transliteration_letter *letter;
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const char *ptr = devanagari;
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const char *end = ptr + strlen(devanagari);
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unsigned int code;
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char *retval;
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while (ptr < end) {
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code = utf8_unpack_char(ptr);
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ptr += utf8_char_length(code);
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letter = find_letter_by_code(code, context->table);
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if (letter && letter->flags & FLAG_MODIFIER) {
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syllable_modify(tail, letter->data);
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continue;
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}
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*indirect = syllable_alloc(letter ? letter->data : NULL, code);
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tail = *indirect;
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indirect = &(*indirect)->next;
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}
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apply_transliteration_filters(head, context->filters);
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retval = syllable_chain_to_string(head);
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syllable_chain_drop(head);
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return retval;
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}
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