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mirror of https://git.FreeBSD.org/src.git synced 2024-12-24 11:29:10 +00:00
freebsd/contrib/mdocml/eqn.c
2012-10-19 22:21:01 +00:00

950 lines
21 KiB
C

/* $Id: eqn.c,v 1.38 2011/07/25 15:37:00 kristaps Exp $ */
/*
* Copyright (c) 2011 Kristaps Dzonsons <kristaps@bsd.lv>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <assert.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "mandoc.h"
#include "libmandoc.h"
#include "libroff.h"
#define EQN_NEST_MAX 128 /* maximum nesting of defines */
#define EQN_MSG(t, x) mandoc_msg((t), (x)->parse, (x)->eqn.ln, (x)->eqn.pos, NULL)
enum eqn_rest {
EQN_DESCOPE,
EQN_ERR,
EQN_OK,
EQN_EOF
};
enum eqn_symt {
EQNSYM_alpha,
EQNSYM_beta,
EQNSYM_chi,
EQNSYM_delta,
EQNSYM_epsilon,
EQNSYM_eta,
EQNSYM_gamma,
EQNSYM_iota,
EQNSYM_kappa,
EQNSYM_lambda,
EQNSYM_mu,
EQNSYM_nu,
EQNSYM_omega,
EQNSYM_omicron,
EQNSYM_phi,
EQNSYM_pi,
EQNSYM_ps,
EQNSYM_rho,
EQNSYM_sigma,
EQNSYM_tau,
EQNSYM_theta,
EQNSYM_upsilon,
EQNSYM_xi,
EQNSYM_zeta,
EQNSYM_DELTA,
EQNSYM_GAMMA,
EQNSYM_LAMBDA,
EQNSYM_OMEGA,
EQNSYM_PHI,
EQNSYM_PI,
EQNSYM_PSI,
EQNSYM_SIGMA,
EQNSYM_THETA,
EQNSYM_UPSILON,
EQNSYM_XI,
EQNSYM_inter,
EQNSYM_union,
EQNSYM_prod,
EQNSYM_int,
EQNSYM_sum,
EQNSYM_grad,
EQNSYM_del,
EQNSYM_times,
EQNSYM_cdot,
EQNSYM_nothing,
EQNSYM_approx,
EQNSYM_prime,
EQNSYM_half,
EQNSYM_partial,
EQNSYM_inf,
EQNSYM_muchgreat,
EQNSYM_muchless,
EQNSYM_larrow,
EQNSYM_rarrow,
EQNSYM_pm,
EQNSYM_nequal,
EQNSYM_equiv,
EQNSYM_lessequal,
EQNSYM_moreequal,
EQNSYM__MAX
};
enum eqnpartt {
EQN_DEFINE = 0,
EQN_NDEFINE,
EQN_TDEFINE,
EQN_SET,
EQN_UNDEF,
EQN_GFONT,
EQN_GSIZE,
EQN_BACK,
EQN_FWD,
EQN_UP,
EQN_DOWN,
EQN__MAX
};
struct eqnstr {
const char *name;
size_t sz;
};
#define STRNEQ(p1, sz1, p2, sz2) \
((sz1) == (sz2) && 0 == strncmp((p1), (p2), (sz1)))
#define EQNSTREQ(x, p, sz) \
STRNEQ((x)->name, (x)->sz, (p), (sz))
struct eqnpart {
struct eqnstr str;
int (*fp)(struct eqn_node *);
};
struct eqnsym {
struct eqnstr str;
const char *sym;
};
static enum eqn_rest eqn_box(struct eqn_node *, struct eqn_box *);
static struct eqn_box *eqn_box_alloc(struct eqn_node *,
struct eqn_box *);
static void eqn_box_free(struct eqn_box *);
static struct eqn_def *eqn_def_find(struct eqn_node *,
const char *, size_t);
static int eqn_do_gfont(struct eqn_node *);
static int eqn_do_gsize(struct eqn_node *);
static int eqn_do_define(struct eqn_node *);
static int eqn_do_ign1(struct eqn_node *);
static int eqn_do_ign2(struct eqn_node *);
static int eqn_do_tdefine(struct eqn_node *);
static int eqn_do_undef(struct eqn_node *);
static enum eqn_rest eqn_eqn(struct eqn_node *, struct eqn_box *);
static enum eqn_rest eqn_list(struct eqn_node *, struct eqn_box *);
static enum eqn_rest eqn_matrix(struct eqn_node *, struct eqn_box *);
static const char *eqn_nexttok(struct eqn_node *, size_t *);
static const char *eqn_nextrawtok(struct eqn_node *, size_t *);
static const char *eqn_next(struct eqn_node *,
char, size_t *, int);
static void eqn_rewind(struct eqn_node *);
static const struct eqnpart eqnparts[EQN__MAX] = {
{ { "define", 6 }, eqn_do_define }, /* EQN_DEFINE */
{ { "ndefine", 7 }, eqn_do_define }, /* EQN_NDEFINE */
{ { "tdefine", 7 }, eqn_do_tdefine }, /* EQN_TDEFINE */
{ { "set", 3 }, eqn_do_ign2 }, /* EQN_SET */
{ { "undef", 5 }, eqn_do_undef }, /* EQN_UNDEF */
{ { "gfont", 5 }, eqn_do_gfont }, /* EQN_GFONT */
{ { "gsize", 5 }, eqn_do_gsize }, /* EQN_GSIZE */
{ { "back", 4 }, eqn_do_ign1 }, /* EQN_BACK */
{ { "fwd", 3 }, eqn_do_ign1 }, /* EQN_FWD */
{ { "up", 2 }, eqn_do_ign1 }, /* EQN_UP */
{ { "down", 4 }, eqn_do_ign1 }, /* EQN_DOWN */
};
static const struct eqnstr eqnmarks[EQNMARK__MAX] = {
{ "", 0 }, /* EQNMARK_NONE */
{ "dot", 3 }, /* EQNMARK_DOT */
{ "dotdot", 6 }, /* EQNMARK_DOTDOT */
{ "hat", 3 }, /* EQNMARK_HAT */
{ "tilde", 5 }, /* EQNMARK_TILDE */
{ "vec", 3 }, /* EQNMARK_VEC */
{ "dyad", 4 }, /* EQNMARK_DYAD */
{ "bar", 3 }, /* EQNMARK_BAR */
{ "under", 5 }, /* EQNMARK_UNDER */
};
static const struct eqnstr eqnfonts[EQNFONT__MAX] = {
{ "", 0 }, /* EQNFONT_NONE */
{ "roman", 5 }, /* EQNFONT_ROMAN */
{ "bold", 4 }, /* EQNFONT_BOLD */
{ "fat", 3 }, /* EQNFONT_FAT */
{ "italic", 6 }, /* EQNFONT_ITALIC */
};
static const struct eqnstr eqnposs[EQNPOS__MAX] = {
{ "", 0 }, /* EQNPOS_NONE */
{ "over", 4 }, /* EQNPOS_OVER */
{ "sup", 3 }, /* EQNPOS_SUP */
{ "sub", 3 }, /* EQNPOS_SUB */
{ "to", 2 }, /* EQNPOS_TO */
{ "from", 4 }, /* EQNPOS_FROM */
};
static const struct eqnstr eqnpiles[EQNPILE__MAX] = {
{ "", 0 }, /* EQNPILE_NONE */
{ "pile", 4 }, /* EQNPILE_PILE */
{ "cpile", 5 }, /* EQNPILE_CPILE */
{ "rpile", 5 }, /* EQNPILE_RPILE */
{ "lpile", 5 }, /* EQNPILE_LPILE */
{ "col", 3 }, /* EQNPILE_COL */
{ "ccol", 4 }, /* EQNPILE_CCOL */
{ "rcol", 4 }, /* EQNPILE_RCOL */
{ "lcol", 4 }, /* EQNPILE_LCOL */
};
static const struct eqnsym eqnsyms[EQNSYM__MAX] = {
{ { "alpha", 5 }, "*a" }, /* EQNSYM_alpha */
{ { "beta", 4 }, "*b" }, /* EQNSYM_beta */
{ { "chi", 3 }, "*x" }, /* EQNSYM_chi */
{ { "delta", 5 }, "*d" }, /* EQNSYM_delta */
{ { "epsilon", 7 }, "*e" }, /* EQNSYM_epsilon */
{ { "eta", 3 }, "*y" }, /* EQNSYM_eta */
{ { "gamma", 5 }, "*g" }, /* EQNSYM_gamma */
{ { "iota", 4 }, "*i" }, /* EQNSYM_iota */
{ { "kappa", 5 }, "*k" }, /* EQNSYM_kappa */
{ { "lambda", 6 }, "*l" }, /* EQNSYM_lambda */
{ { "mu", 2 }, "*m" }, /* EQNSYM_mu */
{ { "nu", 2 }, "*n" }, /* EQNSYM_nu */
{ { "omega", 5 }, "*w" }, /* EQNSYM_omega */
{ { "omicron", 7 }, "*o" }, /* EQNSYM_omicron */
{ { "phi", 3 }, "*f" }, /* EQNSYM_phi */
{ { "pi", 2 }, "*p" }, /* EQNSYM_pi */
{ { "psi", 2 }, "*q" }, /* EQNSYM_psi */
{ { "rho", 3 }, "*r" }, /* EQNSYM_rho */
{ { "sigma", 5 }, "*s" }, /* EQNSYM_sigma */
{ { "tau", 3 }, "*t" }, /* EQNSYM_tau */
{ { "theta", 5 }, "*h" }, /* EQNSYM_theta */
{ { "upsilon", 7 }, "*u" }, /* EQNSYM_upsilon */
{ { "xi", 2 }, "*c" }, /* EQNSYM_xi */
{ { "zeta", 4 }, "*z" }, /* EQNSYM_zeta */
{ { "DELTA", 5 }, "*D" }, /* EQNSYM_DELTA */
{ { "GAMMA", 5 }, "*G" }, /* EQNSYM_GAMMA */
{ { "LAMBDA", 6 }, "*L" }, /* EQNSYM_LAMBDA */
{ { "OMEGA", 5 }, "*W" }, /* EQNSYM_OMEGA */
{ { "PHI", 3 }, "*F" }, /* EQNSYM_PHI */
{ { "PI", 2 }, "*P" }, /* EQNSYM_PI */
{ { "PSI", 3 }, "*Q" }, /* EQNSYM_PSI */
{ { "SIGMA", 5 }, "*S" }, /* EQNSYM_SIGMA */
{ { "THETA", 5 }, "*H" }, /* EQNSYM_THETA */
{ { "UPSILON", 7 }, "*U" }, /* EQNSYM_UPSILON */
{ { "XI", 2 }, "*C" }, /* EQNSYM_XI */
{ { "inter", 5 }, "ca" }, /* EQNSYM_inter */
{ { "union", 5 }, "cu" }, /* EQNSYM_union */
{ { "prod", 4 }, "product" }, /* EQNSYM_prod */
{ { "int", 3 }, "integral" }, /* EQNSYM_int */
{ { "sum", 3 }, "sum" }, /* EQNSYM_sum */
{ { "grad", 4 }, "gr" }, /* EQNSYM_grad */
{ { "del", 3 }, "gr" }, /* EQNSYM_del */
{ { "times", 5 }, "mu" }, /* EQNSYM_times */
{ { "cdot", 4 }, "pc" }, /* EQNSYM_cdot */
{ { "nothing", 7 }, "&" }, /* EQNSYM_nothing */
{ { "approx", 6 }, "~~" }, /* EQNSYM_approx */
{ { "prime", 5 }, "aq" }, /* EQNSYM_prime */
{ { "half", 4 }, "12" }, /* EQNSYM_half */
{ { "partial", 7 }, "pd" }, /* EQNSYM_partial */
{ { "inf", 3 }, "if" }, /* EQNSYM_inf */
{ { ">>", 2 }, ">>" }, /* EQNSYM_muchgreat */
{ { "<<", 2 }, "<<" }, /* EQNSYM_muchless */
{ { "<-", 2 }, "<-" }, /* EQNSYM_larrow */
{ { "->", 2 }, "->" }, /* EQNSYM_rarrow */
{ { "+-", 2 }, "+-" }, /* EQNSYM_pm */
{ { "!=", 2 }, "!=" }, /* EQNSYM_nequal */
{ { "==", 2 }, "==" }, /* EQNSYM_equiv */
{ { "<=", 2 }, "<=" }, /* EQNSYM_lessequal */
{ { ">=", 2 }, ">=" }, /* EQNSYM_moreequal */
};
/* ARGSUSED */
enum rofferr
eqn_read(struct eqn_node **epp, int ln,
const char *p, int pos, int *offs)
{
size_t sz;
struct eqn_node *ep;
enum rofferr er;
ep = *epp;
/*
* If we're the terminating mark, unset our equation status and
* validate the full equation.
*/
if (0 == strncmp(p, ".EN", 3)) {
er = eqn_end(epp);
p += 3;
while (' ' == *p || '\t' == *p)
p++;
if ('\0' == *p)
return(er);
mandoc_msg(MANDOCERR_ARGSLOST, ep->parse, ln, pos, NULL);
return(er);
}
/*
* Build up the full string, replacing all newlines with regular
* whitespace.
*/
sz = strlen(p + pos) + 1;
ep->data = mandoc_realloc(ep->data, ep->sz + sz + 1);
/* First invocation: nil terminate the string. */
if (0 == ep->sz)
*ep->data = '\0';
ep->sz += sz;
strlcat(ep->data, p + pos, ep->sz + 1);
strlcat(ep->data, " ", ep->sz + 1);
return(ROFF_IGN);
}
struct eqn_node *
eqn_alloc(const char *name, int pos, int line, struct mparse *parse)
{
struct eqn_node *p;
size_t sz;
const char *end;
p = mandoc_calloc(1, sizeof(struct eqn_node));
if (name && '\0' != *name) {
sz = strlen(name);
assert(sz);
do {
sz--;
end = name + (int)sz;
} while (' ' == *end || '\t' == *end);
p->eqn.name = mandoc_strndup(name, sz + 1);
}
p->parse = parse;
p->eqn.ln = line;
p->eqn.pos = pos;
p->gsize = EQN_DEFSIZE;
return(p);
}
enum rofferr
eqn_end(struct eqn_node **epp)
{
struct eqn_node *ep;
struct eqn_box *root;
enum eqn_rest c;
ep = *epp;
*epp = NULL;
ep->eqn.root = mandoc_calloc(1, sizeof(struct eqn_box));
root = ep->eqn.root;
root->type = EQN_ROOT;
if (0 == ep->sz)
return(ROFF_IGN);
if (EQN_DESCOPE == (c = eqn_eqn(ep, root))) {
EQN_MSG(MANDOCERR_EQNNSCOPE, ep);
c = EQN_ERR;
}
return(EQN_EOF == c ? ROFF_EQN : ROFF_IGN);
}
static enum eqn_rest
eqn_eqn(struct eqn_node *ep, struct eqn_box *last)
{
struct eqn_box *bp;
enum eqn_rest c;
bp = eqn_box_alloc(ep, last);
bp->type = EQN_SUBEXPR;
while (EQN_OK == (c = eqn_box(ep, bp)))
/* Spin! */ ;
return(c);
}
static enum eqn_rest
eqn_matrix(struct eqn_node *ep, struct eqn_box *last)
{
struct eqn_box *bp;
const char *start;
size_t sz;
enum eqn_rest c;
bp = eqn_box_alloc(ep, last);
bp->type = EQN_MATRIX;
if (NULL == (start = eqn_nexttok(ep, &sz))) {
EQN_MSG(MANDOCERR_EQNEOF, ep);
return(EQN_ERR);
}
if ( ! STRNEQ(start, sz, "{", 1)) {
EQN_MSG(MANDOCERR_EQNSYNT, ep);
return(EQN_ERR);
}
while (EQN_OK == (c = eqn_box(ep, bp)))
switch (bp->last->pile) {
case (EQNPILE_LCOL):
/* FALLTHROUGH */
case (EQNPILE_CCOL):
/* FALLTHROUGH */
case (EQNPILE_RCOL):
continue;
default:
EQN_MSG(MANDOCERR_EQNSYNT, ep);
return(EQN_ERR);
};
if (EQN_DESCOPE != c) {
if (EQN_EOF == c)
EQN_MSG(MANDOCERR_EQNEOF, ep);
return(EQN_ERR);
}
eqn_rewind(ep);
start = eqn_nexttok(ep, &sz);
assert(start);
if (STRNEQ(start, sz, "}", 1))
return(EQN_OK);
EQN_MSG(MANDOCERR_EQNBADSCOPE, ep);
return(EQN_ERR);
}
static enum eqn_rest
eqn_list(struct eqn_node *ep, struct eqn_box *last)
{
struct eqn_box *bp;
const char *start;
size_t sz;
enum eqn_rest c;
bp = eqn_box_alloc(ep, last);
bp->type = EQN_LIST;
if (NULL == (start = eqn_nexttok(ep, &sz))) {
EQN_MSG(MANDOCERR_EQNEOF, ep);
return(EQN_ERR);
}
if ( ! STRNEQ(start, sz, "{", 1)) {
EQN_MSG(MANDOCERR_EQNSYNT, ep);
return(EQN_ERR);
}
while (EQN_DESCOPE == (c = eqn_eqn(ep, bp))) {
eqn_rewind(ep);
start = eqn_nexttok(ep, &sz);
assert(start);
if ( ! STRNEQ(start, sz, "above", 5))
break;
}
if (EQN_DESCOPE != c) {
if (EQN_ERR != c)
EQN_MSG(MANDOCERR_EQNSCOPE, ep);
return(EQN_ERR);
}
eqn_rewind(ep);
start = eqn_nexttok(ep, &sz);
assert(start);
if (STRNEQ(start, sz, "}", 1))
return(EQN_OK);
EQN_MSG(MANDOCERR_EQNBADSCOPE, ep);
return(EQN_ERR);
}
static enum eqn_rest
eqn_box(struct eqn_node *ep, struct eqn_box *last)
{
size_t sz;
const char *start;
char *left;
char sym[64];
enum eqn_rest c;
int i, size;
struct eqn_box *bp;
if (NULL == (start = eqn_nexttok(ep, &sz)))
return(EQN_EOF);
if (STRNEQ(start, sz, "}", 1))
return(EQN_DESCOPE);
else if (STRNEQ(start, sz, "right", 5))
return(EQN_DESCOPE);
else if (STRNEQ(start, sz, "above", 5))
return(EQN_DESCOPE);
else if (STRNEQ(start, sz, "mark", 4))
return(EQN_OK);
else if (STRNEQ(start, sz, "lineup", 6))
return(EQN_OK);
for (i = 0; i < (int)EQN__MAX; i++) {
if ( ! EQNSTREQ(&eqnparts[i].str, start, sz))
continue;
return((*eqnparts[i].fp)(ep) ?
EQN_OK : EQN_ERR);
}
if (STRNEQ(start, sz, "{", 1)) {
if (EQN_DESCOPE != (c = eqn_eqn(ep, last))) {
if (EQN_ERR != c)
EQN_MSG(MANDOCERR_EQNSCOPE, ep);
return(EQN_ERR);
}
eqn_rewind(ep);
start = eqn_nexttok(ep, &sz);
assert(start);
if (STRNEQ(start, sz, "}", 1))
return(EQN_OK);
EQN_MSG(MANDOCERR_EQNBADSCOPE, ep);
return(EQN_ERR);
}
for (i = 0; i < (int)EQNPILE__MAX; i++) {
if ( ! EQNSTREQ(&eqnpiles[i], start, sz))
continue;
if (EQN_OK == (c = eqn_list(ep, last)))
last->last->pile = (enum eqn_pilet)i;
return(c);
}
if (STRNEQ(start, sz, "matrix", 6))
return(eqn_matrix(ep, last));
if (STRNEQ(start, sz, "left", 4)) {
if (NULL == (start = eqn_nexttok(ep, &sz))) {
EQN_MSG(MANDOCERR_EQNEOF, ep);
return(EQN_ERR);
}
left = mandoc_strndup(start, sz);
c = eqn_eqn(ep, last);
if (last->last)
last->last->left = left;
else
free(left);
if (EQN_DESCOPE != c)
return(c);
assert(last->last);
eqn_rewind(ep);
start = eqn_nexttok(ep, &sz);
assert(start);
if ( ! STRNEQ(start, sz, "right", 5))
return(EQN_DESCOPE);
if (NULL == (start = eqn_nexttok(ep, &sz))) {
EQN_MSG(MANDOCERR_EQNEOF, ep);
return(EQN_ERR);
}
last->last->right = mandoc_strndup(start, sz);
return(EQN_OK);
}
for (i = 0; i < (int)EQNPOS__MAX; i++) {
if ( ! EQNSTREQ(&eqnposs[i], start, sz))
continue;
if (NULL == last->last) {
EQN_MSG(MANDOCERR_EQNSYNT, ep);
return(EQN_ERR);
}
last->last->pos = (enum eqn_post)i;
if (EQN_EOF == (c = eqn_box(ep, last))) {
EQN_MSG(MANDOCERR_EQNEOF, ep);
return(EQN_ERR);
}
return(c);
}
for (i = 0; i < (int)EQNMARK__MAX; i++) {
if ( ! EQNSTREQ(&eqnmarks[i], start, sz))
continue;
if (NULL == last->last) {
EQN_MSG(MANDOCERR_EQNSYNT, ep);
return(EQN_ERR);
}
last->last->mark = (enum eqn_markt)i;
if (EQN_EOF == (c = eqn_box(ep, last))) {
EQN_MSG(MANDOCERR_EQNEOF, ep);
return(EQN_ERR);
}
return(c);
}
for (i = 0; i < (int)EQNFONT__MAX; i++) {
if ( ! EQNSTREQ(&eqnfonts[i], start, sz))
continue;
if (EQN_EOF == (c = eqn_box(ep, last))) {
EQN_MSG(MANDOCERR_EQNEOF, ep);
return(EQN_ERR);
} else if (EQN_OK == c)
last->last->font = (enum eqn_fontt)i;
return(c);
}
if (STRNEQ(start, sz, "size", 4)) {
if (NULL == (start = eqn_nexttok(ep, &sz))) {
EQN_MSG(MANDOCERR_EQNEOF, ep);
return(EQN_ERR);
}
size = mandoc_strntoi(start, sz, 10);
if (EQN_EOF == (c = eqn_box(ep, last))) {
EQN_MSG(MANDOCERR_EQNEOF, ep);
return(EQN_ERR);
} else if (EQN_OK != c)
return(c);
last->last->size = size;
}
bp = eqn_box_alloc(ep, last);
bp->type = EQN_TEXT;
for (i = 0; i < (int)EQNSYM__MAX; i++)
if (EQNSTREQ(&eqnsyms[i].str, start, sz)) {
sym[63] = '\0';
snprintf(sym, 62, "\\[%s]", eqnsyms[i].sym);
bp->text = mandoc_strdup(sym);
return(EQN_OK);
}
bp->text = mandoc_strndup(start, sz);
return(EQN_OK);
}
void
eqn_free(struct eqn_node *p)
{
int i;
eqn_box_free(p->eqn.root);
for (i = 0; i < (int)p->defsz; i++) {
free(p->defs[i].key);
free(p->defs[i].val);
}
free(p->eqn.name);
free(p->data);
free(p->defs);
free(p);
}
static struct eqn_box *
eqn_box_alloc(struct eqn_node *ep, struct eqn_box *parent)
{
struct eqn_box *bp;
bp = mandoc_calloc(1, sizeof(struct eqn_box));
bp->parent = parent;
bp->size = ep->gsize;
if (NULL == parent->first)
parent->first = bp;
else
parent->last->next = bp;
parent->last = bp;
return(bp);
}
static void
eqn_box_free(struct eqn_box *bp)
{
if (bp->first)
eqn_box_free(bp->first);
if (bp->next)
eqn_box_free(bp->next);
free(bp->text);
free(bp->left);
free(bp->right);
free(bp);
}
static const char *
eqn_nextrawtok(struct eqn_node *ep, size_t *sz)
{
return(eqn_next(ep, '"', sz, 0));
}
static const char *
eqn_nexttok(struct eqn_node *ep, size_t *sz)
{
return(eqn_next(ep, '"', sz, 1));
}
static void
eqn_rewind(struct eqn_node *ep)
{
ep->cur = ep->rew;
}
static const char *
eqn_next(struct eqn_node *ep, char quote, size_t *sz, int repl)
{
char *start, *next;
int q, diff, lim;
size_t ssz, dummy;
struct eqn_def *def;
if (NULL == sz)
sz = &dummy;
lim = 0;
ep->rew = ep->cur;
again:
/* Prevent self-definitions. */
if (lim >= EQN_NEST_MAX) {
EQN_MSG(MANDOCERR_ROFFLOOP, ep);
return(NULL);
}
ep->cur = ep->rew;
start = &ep->data[(int)ep->cur];
q = 0;
if ('\0' == *start)
return(NULL);
if (quote == *start) {
ep->cur++;
q = 1;
}
start = &ep->data[(int)ep->cur];
if ( ! q) {
if ('{' == *start || '}' == *start)
ssz = 1;
else
ssz = strcspn(start + 1, " ^~\"{}\t") + 1;
next = start + (int)ssz;
if ('\0' == *next)
next = NULL;
} else
next = strchr(start, quote);
if (NULL != next) {
*sz = (size_t)(next - start);
ep->cur += *sz;
if (q)
ep->cur++;
while (' ' == ep->data[(int)ep->cur] ||
'\t' == ep->data[(int)ep->cur] ||
'^' == ep->data[(int)ep->cur] ||
'~' == ep->data[(int)ep->cur])
ep->cur++;
} else {
if (q)
EQN_MSG(MANDOCERR_BADQUOTE, ep);
next = strchr(start, '\0');
*sz = (size_t)(next - start);
ep->cur += *sz;
}
/* Quotes aren't expanded for values. */
if (q || ! repl)
return(start);
if (NULL != (def = eqn_def_find(ep, start, *sz))) {
diff = def->valsz - *sz;
if (def->valsz > *sz) {
ep->sz += diff;
ep->data = mandoc_realloc(ep->data, ep->sz + 1);
ep->data[ep->sz] = '\0';
start = &ep->data[(int)ep->rew];
}
diff = def->valsz - *sz;
memmove(start + *sz + diff, start + *sz,
(strlen(start) - *sz) + 1);
memcpy(start, def->val, def->valsz);
goto again;
}
return(start);
}
static int
eqn_do_ign1(struct eqn_node *ep)
{
if (NULL == eqn_nextrawtok(ep, NULL))
EQN_MSG(MANDOCERR_EQNEOF, ep);
else
return(1);
return(0);
}
static int
eqn_do_ign2(struct eqn_node *ep)
{
if (NULL == eqn_nextrawtok(ep, NULL))
EQN_MSG(MANDOCERR_EQNEOF, ep);
else if (NULL == eqn_nextrawtok(ep, NULL))
EQN_MSG(MANDOCERR_EQNEOF, ep);
else
return(1);
return(0);
}
static int
eqn_do_tdefine(struct eqn_node *ep)
{
if (NULL == eqn_nextrawtok(ep, NULL))
EQN_MSG(MANDOCERR_EQNEOF, ep);
else if (NULL == eqn_next(ep, ep->data[(int)ep->cur], NULL, 0))
EQN_MSG(MANDOCERR_EQNEOF, ep);
else
return(1);
return(0);
}
static int
eqn_do_define(struct eqn_node *ep)
{
const char *start;
size_t sz;
struct eqn_def *def;
int i;
if (NULL == (start = eqn_nextrawtok(ep, &sz))) {
EQN_MSG(MANDOCERR_EQNEOF, ep);
return(0);
}
/*
* Search for a key that already exists.
* Create a new key if none is found.
*/
if (NULL == (def = eqn_def_find(ep, start, sz))) {
/* Find holes in string array. */
for (i = 0; i < (int)ep->defsz; i++)
if (0 == ep->defs[i].keysz)
break;
if (i == (int)ep->defsz) {
ep->defsz++;
ep->defs = mandoc_realloc
(ep->defs, ep->defsz *
sizeof(struct eqn_def));
ep->defs[i].key = ep->defs[i].val = NULL;
}
ep->defs[i].keysz = sz;
ep->defs[i].key = mandoc_realloc
(ep->defs[i].key, sz + 1);
memcpy(ep->defs[i].key, start, sz);
ep->defs[i].key[(int)sz] = '\0';
def = &ep->defs[i];
}
start = eqn_next(ep, ep->data[(int)ep->cur], &sz, 0);
if (NULL == start) {
EQN_MSG(MANDOCERR_EQNEOF, ep);
return(0);
}
def->valsz = sz;
def->val = mandoc_realloc(def->val, sz + 1);
memcpy(def->val, start, sz);
def->val[(int)sz] = '\0';
return(1);
}
static int
eqn_do_gfont(struct eqn_node *ep)
{
if (NULL == eqn_nextrawtok(ep, NULL)) {
EQN_MSG(MANDOCERR_EQNEOF, ep);
return(0);
}
return(1);
}
static int
eqn_do_gsize(struct eqn_node *ep)
{
const char *start;
size_t sz;
if (NULL == (start = eqn_nextrawtok(ep, &sz))) {
EQN_MSG(MANDOCERR_EQNEOF, ep);
return(0);
}
ep->gsize = mandoc_strntoi(start, sz, 10);
return(1);
}
static int
eqn_do_undef(struct eqn_node *ep)
{
const char *start;
struct eqn_def *def;
size_t sz;
if (NULL == (start = eqn_nextrawtok(ep, &sz))) {
EQN_MSG(MANDOCERR_EQNEOF, ep);
return(0);
} else if (NULL != (def = eqn_def_find(ep, start, sz)))
def->keysz = 0;
return(1);
}
static struct eqn_def *
eqn_def_find(struct eqn_node *ep, const char *key, size_t sz)
{
int i;
for (i = 0; i < (int)ep->defsz; i++)
if (ep->defs[i].keysz && STRNEQ(ep->defs[i].key,
ep->defs[i].keysz, key, sz))
return(&ep->defs[i]);
return(NULL);
}