181 lines
3.8 KiB
C
181 lines
3.8 KiB
C
/*
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*******************************************************************************
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*
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* Copyright (C) 1998-1999, International Business Machines
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* Corporation and others. All Rights Reserved.
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*
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*******************************************************************************
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*
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* File uscanset.c
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*
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* Modification History:
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*
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* Date Name Description
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* 12/03/98 stephen Creation.
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* 03/13/99 stephen Modified for new C API.
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*******************************************************************************
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*/
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#include "uscanset.h"
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static UBool
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u_scanf_scanset_add(u_scanf_scanset *scanset,
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UChar c)
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{
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if(scanset->single_count == U_SCANF_MAX_SCANSET_SIZE - 1)
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return FALSE;
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scanset->singles[ scanset->single_count ] = c;
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(scanset->single_count)++;
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return TRUE;
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}
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static UBool
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u_scanf_scanset_addrange(u_scanf_scanset *scanset,
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UChar start,
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UChar end)
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{
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if(scanset->pair_count == U_SCANF_MAX_SCANSET_SIZE - 1)
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return FALSE;
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scanset->pairs[ scanset->pair_count ].start = start;
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scanset->pairs[ scanset->pair_count ].end = end;
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(scanset->pair_count)++;
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return TRUE;
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}
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UBool
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u_scanf_scanset_init(u_scanf_scanset *scanset,
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const UChar *s,
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int32_t *len)
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{
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UChar c;
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const UChar *limit;
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int32_t count;
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UBool result = FALSE;
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/* set up parameters */
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limit = s + *len;
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count = 0;
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/* initialize to defaults */
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scanset->single_count = 0;
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scanset->pair_count = 0;
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scanset->is_inclusive = TRUE;
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/* check to see if this is an inclusive or exclusive scanset */
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if(*s == 0x005E) { /* '^' */
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scanset->is_inclusive = FALSE;
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/* increment s and count */
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++s;
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++count;
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}
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/* if ']' is the first character, add it */
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else if(*s == 0x005D) {
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result = u_scanf_scanset_add(scanset, *s++);
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/* increment count */
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++count;
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}
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/* if the first character is '^' and the second is ']', add ']' */
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if( ! scanset->is_inclusive && *s == 0x005D) {
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result = u_scanf_scanset_add(scanset, *s++);
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/* increment count */
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++count;
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}
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/* add characters until a ']' is seen, adding ranges as necessary */
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while(s < limit) {
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/* grab the current character */
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c = *s++;
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/* if it's a ']', we're done */
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if(c == 0x005D)
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break;
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/* check if this is a range */
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if(*s == 0x002D && *(s+1) != 0x005D) {
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result = u_scanf_scanset_addrange(scanset, c, *(s+1));
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/* increment count and s */
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s += 2;
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count += 2;
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}
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/* otherwise, just add the character */
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else {
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result = u_scanf_scanset_add(scanset, c);
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}
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/* increment count */
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++count;
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}
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/* update length to reflect # of characters consumed */
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*len = count;
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return result;
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}
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UBool
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u_scanf_scanset_in(u_scanf_scanset *scanset,
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UChar c)
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{
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int i;
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/* if this is an inclusive scanset, make sure c is in it */
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if(scanset->is_inclusive) {
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/* check the single chars first*/
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for(i = 0; i < scanset->single_count; ++i) {
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if(c == scanset->singles[i])
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return TRUE;
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}
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/* check the pairs */
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for(i = 0; i < scanset->pair_count; ++i) {
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if(c >= scanset->pairs[i].start && c <= scanset->pairs[i].end)
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return TRUE;
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}
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/* didn't find it, so c isn't in set */
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return FALSE;
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}
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/* otherwise, make sure c isn't in it */
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else {
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/* check the single chars first*/
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for(i = 0; i < scanset->single_count; ++i) {
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if(c == scanset->singles[i])
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return FALSE;
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}
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/* check the pairs */
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for(i = 0; i < scanset->pair_count; ++i) {
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if(c >= scanset->pairs[i].start && c <= scanset->pairs[i].end)
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return FALSE;
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}
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/* didn't find it, so c is in set */
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return TRUE;
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}
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}
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