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/*
* contents.c: build a table of contents
*/
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <limits.h>
#include "buttress.h"
struct numberstate_Tag {
int chapternum;
int appendixnum;
int ischapter;
int *sectionlevels;
int maxsectlevel;
int listitem;
};
numberstate *number_init(void) {
numberstate *ret = mknew(numberstate);
ret->chapternum = 0;
ret->appendixnum = -1;
ret->ischapter = 1;
ret->maxsectlevel = 32;
ret->sectionlevels = mknewa(int, ret->maxsectlevel);
ret->listitem = -1;
return ret;
}
void number_free(numberstate *state) {
sfree(state->sectionlevels);
sfree(state);
}
static void dotext(word ***wret, wchar_t *text) {
word *mnewword = mknew(word);
mnewword->text = ustrdup(text);
mnewword->type = word_Normal;
mnewword->alt = NULL;
mnewword->next = NULL;
**wret = mnewword;
*wret = &mnewword->next;
}
static void dospace(word ***wret) {
word *mnewword = mknew(word);
mnewword->text = NULL;
mnewword->type = word_WhiteSpace;
mnewword->alt = NULL;
mnewword->next = NULL;
**wret = mnewword;
*wret = &mnewword->next;
}
static void donumber(word ***wret, int num) {
wchar_t text[20];
wchar_t *p = text + sizeof(text);
*--p = L'\0';
while (num != 0) {
assert(p > text);
*--p = L"0123456789"[num % 10];
num /= 10;
}
dotext(wret, p);
}
static void doanumber(word ***wret, int num) {
wchar_t text[20];
wchar_t *p;
int nletters, aton;
nletters = 1;
aton = 25;
while (num > aton) {
nletters++;
num -= aton+1;
if (aton < INT_MAX/26)
aton = (aton+1) * 26 - 1;
else
aton = INT_MAX;
}
p = text + sizeof(text);
*--p = L'\0';
while (nletters--) {
assert(p > text);
*--p = L"ABCDEFGHIJKLMNOPQRSTUVWXYZ"[num % 26];
num /= 26;
}
dotext(wret, p);
}
word *number_mktext(numberstate *state, int para, int aux, int prev,
word **auxret) {
word *ret = NULL;
word **ret2 = &ret;
word **pret = &ret;
int i, level;
switch (para) {
case para_Chapter:
state->chapternum++;
for (i = 0; i < state->maxsectlevel; i++)
state->sectionlevels[i] = 0;
dotext(&pret, L"Chapter");
dospace(&pret);
ret2 = pret;
donumber(&pret, state->chapternum);
state->ischapter = 1;
break;
case para_Heading:
case para_Subsect:
level = (para == para_Heading ? 0 : aux);
if (state->maxsectlevel <= level) {
state->maxsectlevel = level + 32;
state->sectionlevels = resize(state->sectionlevels,
state->maxsectlevel);
}
state->sectionlevels[level]++;
for (i = level+1; i < state->maxsectlevel; i++)
state->sectionlevels[i] = 0;
dotext(&pret, L"Section");
dospace(&pret);
ret2 = pret;
if (state->ischapter)
donumber(&pret, state->chapternum);
else
doanumber(&pret, state->appendixnum);
for (i = 0; i <= level; i++) {
dotext(&pret, L".");
if (state->sectionlevels[i] == 0)
state->sectionlevels[i] = 1;
donumber(&pret, state->sectionlevels[i]);
}
break;
case para_Appendix:
state->appendixnum++;
for (i = 0; i < state->maxsectlevel; i++)
state->sectionlevels[i] = 0;
dotext(&pret, L"Appendix");
dospace(&pret);
ret2 = pret;
doanumber(&pret, state->appendixnum);
state->ischapter = 0;
break;
case para_NumberedList:
ret2 = pret;
if (prev != para_NumberedList)
state->listitem = 0;
state->listitem++;
donumber(&pret, state->listitem);
break;
}
if (auxret)
*auxret = *ret2;
return ret;
}
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