/* $Id: eqn.c,v 1.64 2017/06/21 18:04:34 schwarze Exp $ */ /* * Copyright (c) 2011, 2014 Kristaps Dzonsons * Copyright (c) 2014, 2015, 2017 Ingo Schwarze * * 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. */ #include "config.h" #include #include #include #include #include #include #include #include "mandoc.h" #include "mandoc_aux.h" #include "libmandoc.h" #include "libroff.h" #define EQN_NEST_MAX 128 /* maximum nesting of defines */ #define STRNEQ(p1, sz1, p2, sz2) \ ((sz1) == (sz2) && 0 == strncmp((p1), (p2), (sz1))) enum eqn_tok { EQN_TOK_DYAD = 0, EQN_TOK_VEC, EQN_TOK_UNDER, EQN_TOK_BAR, EQN_TOK_TILDE, EQN_TOK_HAT, EQN_TOK_DOT, EQN_TOK_DOTDOT, EQN_TOK_FWD, EQN_TOK_BACK, EQN_TOK_DOWN, EQN_TOK_UP, EQN_TOK_FAT, EQN_TOK_ROMAN, EQN_TOK_ITALIC, EQN_TOK_BOLD, EQN_TOK_SIZE, EQN_TOK_SUB, EQN_TOK_SUP, EQN_TOK_SQRT, EQN_TOK_OVER, EQN_TOK_FROM, EQN_TOK_TO, EQN_TOK_BRACE_OPEN, EQN_TOK_BRACE_CLOSE, EQN_TOK_GSIZE, EQN_TOK_GFONT, EQN_TOK_MARK, EQN_TOK_LINEUP, EQN_TOK_LEFT, EQN_TOK_RIGHT, EQN_TOK_PILE, EQN_TOK_LPILE, EQN_TOK_RPILE, EQN_TOK_CPILE, EQN_TOK_MATRIX, EQN_TOK_CCOL, EQN_TOK_LCOL, EQN_TOK_RCOL, EQN_TOK_DELIM, EQN_TOK_DEFINE, EQN_TOK_TDEFINE, EQN_TOK_NDEFINE, EQN_TOK_UNDEF, EQN_TOK_ABOVE, EQN_TOK__MAX, EQN_TOK_FUNC, EQN_TOK_EOF }; static const char *eqn_toks[EQN_TOK__MAX] = { "dyad", /* EQN_TOK_DYAD */ "vec", /* EQN_TOK_VEC */ "under", /* EQN_TOK_UNDER */ "bar", /* EQN_TOK_BAR */ "tilde", /* EQN_TOK_TILDE */ "hat", /* EQN_TOK_HAT */ "dot", /* EQN_TOK_DOT */ "dotdot", /* EQN_TOK_DOTDOT */ "fwd", /* EQN_TOK_FWD * */ "back", /* EQN_TOK_BACK */ "down", /* EQN_TOK_DOWN */ "up", /* EQN_TOK_UP */ "fat", /* EQN_TOK_FAT */ "roman", /* EQN_TOK_ROMAN */ "italic", /* EQN_TOK_ITALIC */ "bold", /* EQN_TOK_BOLD */ "size", /* EQN_TOK_SIZE */ "sub", /* EQN_TOK_SUB */ "sup", /* EQN_TOK_SUP */ "sqrt", /* EQN_TOK_SQRT */ "over", /* EQN_TOK_OVER */ "from", /* EQN_TOK_FROM */ "to", /* EQN_TOK_TO */ "{", /* EQN_TOK_BRACE_OPEN */ "}", /* EQN_TOK_BRACE_CLOSE */ "gsize", /* EQN_TOK_GSIZE */ "gfont", /* EQN_TOK_GFONT */ "mark", /* EQN_TOK_MARK */ "lineup", /* EQN_TOK_LINEUP */ "left", /* EQN_TOK_LEFT */ "right", /* EQN_TOK_RIGHT */ "pile", /* EQN_TOK_PILE */ "lpile", /* EQN_TOK_LPILE */ "rpile", /* EQN_TOK_RPILE */ "cpile", /* EQN_TOK_CPILE */ "matrix", /* EQN_TOK_MATRIX */ "ccol", /* EQN_TOK_CCOL */ "lcol", /* EQN_TOK_LCOL */ "rcol", /* EQN_TOK_RCOL */ "delim", /* EQN_TOK_DELIM */ "define", /* EQN_TOK_DEFINE */ "tdefine", /* EQN_TOK_TDEFINE */ "ndefine", /* EQN_TOK_NDEFINE */ "undef", /* EQN_TOK_UNDEF */ "above", /* EQN_TOK_ABOVE */ }; static const char *const eqn_func[] = { "acos", "acsc", "and", "arc", "asec", "asin", "atan", "cos", "cosh", "coth", "csc", "det", "exp", "for", "if", "lim", "ln", "log", "max", "min", "sec", "sin", "sinh", "tan", "tanh", "Im", "Re", }; 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_minus, EQNSYM__MAX }; struct eqnsym { const char *str; const char *sym; }; static const struct eqnsym eqnsyms[EQNSYM__MAX] = { { "alpha", "*a" }, /* EQNSYM_alpha */ { "beta", "*b" }, /* EQNSYM_beta */ { "chi", "*x" }, /* EQNSYM_chi */ { "delta", "*d" }, /* EQNSYM_delta */ { "epsilon", "*e" }, /* EQNSYM_epsilon */ { "eta", "*y" }, /* EQNSYM_eta */ { "gamma", "*g" }, /* EQNSYM_gamma */ { "iota", "*i" }, /* EQNSYM_iota */ { "kappa", "*k" }, /* EQNSYM_kappa */ { "lambda", "*l" }, /* EQNSYM_lambda */ { "mu", "*m" }, /* EQNSYM_mu */ { "nu", "*n" }, /* EQNSYM_nu */ { "omega", "*w" }, /* EQNSYM_omega */ { "omicron", "*o" }, /* EQNSYM_omicron */ { "phi", "*f" }, /* EQNSYM_phi */ { "pi", "*p" }, /* EQNSYM_pi */ { "psi", "*q" }, /* EQNSYM_psi */ { "rho", "*r" }, /* EQNSYM_rho */ { "sigma", "*s" }, /* EQNSYM_sigma */ { "tau", "*t" }, /* EQNSYM_tau */ { "theta", "*h" }, /* EQNSYM_theta */ { "upsilon", "*u" }, /* EQNSYM_upsilon */ { "xi", "*c" }, /* EQNSYM_xi */ { "zeta", "*z" }, /* EQNSYM_zeta */ { "DELTA", "*D" }, /* EQNSYM_DELTA */ { "GAMMA", "*G" }, /* EQNSYM_GAMMA */ { "LAMBDA", "*L" }, /* EQNSYM_LAMBDA */ { "OMEGA", "*W" }, /* EQNSYM_OMEGA */ { "PHI", "*F" }, /* EQNSYM_PHI */ { "PI", "*P" }, /* EQNSYM_PI */ { "PSI", "*Q" }, /* EQNSYM_PSI */ { "SIGMA", "*S" }, /* EQNSYM_SIGMA */ { "THETA", "*H" }, /* EQNSYM_THETA */ { "UPSILON", "*U" }, /* EQNSYM_UPSILON */ { "XI", "*C" }, /* EQNSYM_XI */ { "inter", "ca" }, /* EQNSYM_inter */ { "union", "cu" }, /* EQNSYM_union */ { "prod", "product" }, /* EQNSYM_prod */ { "int", "integral" }, /* EQNSYM_int */ { "sum", "sum" }, /* EQNSYM_sum */ { "grad", "gr" }, /* EQNSYM_grad */ { "del", "gr" }, /* EQNSYM_del */ { "times", "mu" }, /* EQNSYM_times */ { "cdot", "pc" }, /* EQNSYM_cdot */ { "nothing", "&" }, /* EQNSYM_nothing */ { "approx", "~~" }, /* EQNSYM_approx */ { "prime", "fm" }, /* EQNSYM_prime */ { "half", "12" }, /* EQNSYM_half */ { "partial", "pd" }, /* EQNSYM_partial */ { "inf", "if" }, /* EQNSYM_inf */ { ">>", ">>" }, /* EQNSYM_muchgreat */ { "<<", "<<" }, /* EQNSYM_muchless */ { "<-", "<-" }, /* EQNSYM_larrow */ { "->", "->" }, /* EQNSYM_rarrow */ { "+-", "+-" }, /* EQNSYM_pm */ { "!=", "!=" }, /* EQNSYM_nequal */ { "==", "==" }, /* EQNSYM_equiv */ { "<=", "<=" }, /* EQNSYM_lessequal */ { ">=", ">=" }, /* EQNSYM_moreequal */ { "-", "mi" }, /* EQNSYM_minus */ }; static struct eqn_box *eqn_box_alloc(struct eqn_node *, struct eqn_box *); static void eqn_box_free(struct eqn_box *); static struct eqn_box *eqn_box_makebinary(struct eqn_node *, enum eqn_post, struct eqn_box *); static void eqn_def(struct eqn_node *); static struct eqn_def *eqn_def_find(struct eqn_node *, const char *, size_t); static void eqn_delim(struct eqn_node *); static const char *eqn_next(struct eqn_node *, char, size_t *, int); static const char *eqn_nextrawtok(struct eqn_node *, size_t *); static const char *eqn_nexttok(struct eqn_node *, size_t *); static enum rofferr eqn_parse(struct eqn_node *, struct eqn_box *); static enum eqn_tok eqn_tok_parse(struct eqn_node *, char **); static void eqn_undef(struct eqn_node *); 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_vmsg(MANDOCERR_ARG_SKIP, ep->parse, ln, pos, "EN %s", p); 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(int pos, int line, struct mparse *parse) { struct eqn_node *p; p = mandoc_calloc(1, sizeof(struct eqn_node)); p->parse = parse; p->eqn.ln = line; p->eqn.pos = pos; p->gsize = EQN_DEFSIZE; return p; } /* * Find the key "key" of the give size within our eqn-defined values. */ 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; } /* * Get the next token from the input stream using the given quote * character. * Optionally make any replacements. */ static const char * eqn_next(struct eqn_node *ep, char quote, size_t *sz, int repl) { static size_t last_len; static int lim; char *start, *next; int q, diff; size_t ssz, dummy; struct eqn_def *def; if (NULL == sz) sz = &dummy; if (ep->cur >= last_len) lim = 0; ep->rew = ep->cur; again: /* Prevent self-definitions. */ if (lim >= EQN_NEST_MAX) { mandoc_msg(MANDOCERR_ROFFLOOP, ep->parse, ep->eqn.ln, ep->eqn.pos, NULL); 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) mandoc_msg(MANDOCERR_ARG_QUOTE, ep->parse, ep->eqn.ln, ep->eqn.pos, NULL); 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); last_len = start - ep->data + def->valsz; lim++; goto again; } return start; } /* * Get the next delimited token using the default current quote * character. */ static const char * eqn_nexttok(struct eqn_node *ep, size_t *sz) { return eqn_next(ep, '"', sz, 1); } /* * Get next token without replacement. */ static const char * eqn_nextrawtok(struct eqn_node *ep, size_t *sz) { return eqn_next(ep, '"', sz, 0); } /* * Parse a token from the stream of text. * A token consists of one of the recognised eqn(7) strings. * Strings are separated by delimiting marks. * This returns EQN_TOK_EOF when there are no more tokens. * If the token is an unrecognised string literal, then it returns * EQN_TOK__MAX and sets the "p" pointer to an allocated, nil-terminated * string. * This must be later freed with free(3). */ static enum eqn_tok eqn_tok_parse(struct eqn_node *ep, char **p) { const char *start; size_t i, sz; int quoted; if (p != NULL) *p = NULL; quoted = ep->data[ep->cur] == '"'; if ((start = eqn_nexttok(ep, &sz)) == NULL) return EQN_TOK_EOF; if (quoted) { if (p != NULL) *p = mandoc_strndup(start, sz); return EQN_TOK__MAX; } for (i = 0; i < EQN_TOK__MAX; i++) if (STRNEQ(start, sz, eqn_toks[i], strlen(eqn_toks[i]))) return i; if (p != NULL) *p = mandoc_strndup(start, sz); for (i = 0; i < sizeof(eqn_func)/sizeof(*eqn_func); i++) if (STRNEQ(start, sz, eqn_func[i], strlen(eqn_func[i]))) return EQN_TOK_FUNC; return EQN_TOK__MAX; } 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->top); free(bp->bottom); free(bp); } /* * Allocate a box as the last child of the parent node. */ 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->parent->args++; bp->expectargs = UINT_MAX; bp->size = ep->gsize; if (NULL != parent->first) { parent->last->next = bp; bp->prev = parent->last; } else parent->first = bp; parent->last = bp; return bp; } /* * Reparent the current last node (of the current parent) under a new * EQN_SUBEXPR as the first element. * Then return the new parent. * The new EQN_SUBEXPR will have a two-child limit. */ static struct eqn_box * eqn_box_makebinary(struct eqn_node *ep, enum eqn_post pos, struct eqn_box *parent) { struct eqn_box *b, *newb; assert(NULL != parent->last); b = parent->last; if (parent->last == parent->first) parent->first = NULL; parent->args--; parent->last = b->prev; b->prev = NULL; newb = eqn_box_alloc(ep, parent); newb->pos = pos; newb->type = EQN_SUBEXPR; newb->expectargs = 2; newb->args = 1; newb->first = newb->last = b; newb->first->next = NULL; b->parent = newb; return newb; } /* * Parse the "delim" control statement. */ static void eqn_delim(struct eqn_node *ep) { const char *start; size_t sz; if ((start = eqn_nextrawtok(ep, &sz)) == NULL) mandoc_msg(MANDOCERR_REQ_EMPTY, ep->parse, ep->eqn.ln, ep->eqn.pos, "delim"); else if (strncmp(start, "off", 3) == 0) ep->delim = 0; else if (strncmp(start, "on", 2) == 0) { if (ep->odelim && ep->cdelim) ep->delim = 1; } else if (start[1] != '\0') { ep->odelim = start[0]; ep->cdelim = start[1]; ep->delim = 1; } } /* * Undefine a previously-defined string. */ static void eqn_undef(struct eqn_node *ep) { const char *start; struct eqn_def *def; size_t sz; if ((start = eqn_nextrawtok(ep, &sz)) == NULL) { mandoc_msg(MANDOCERR_REQ_EMPTY, ep->parse, ep->eqn.ln, ep->eqn.pos, "undef"); return; } if ((def = eqn_def_find(ep, start, sz)) == NULL) return; free(def->key); free(def->val); def->key = def->val = NULL; def->keysz = def->valsz = 0; } static void eqn_def(struct eqn_node *ep) { const char *start; size_t sz; struct eqn_def *def; int i; if ((start = eqn_nextrawtok(ep, &sz)) == NULL) { mandoc_msg(MANDOCERR_REQ_EMPTY, ep->parse, ep->eqn.ln, ep->eqn.pos, "define"); return; } /* * 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_reallocarray(ep->defs, ep->defsz, sizeof(struct eqn_def)); ep->defs[i].key = ep->defs[i].val = NULL; } def = ep->defs + i; free(def->key); def->key = mandoc_strndup(start, sz); def->keysz = sz; } start = eqn_next(ep, ep->data[(int)ep->cur], &sz, 0); if (start == NULL) { mandoc_vmsg(MANDOCERR_REQ_EMPTY, ep->parse, ep->eqn.ln, ep->eqn.pos, "define %s", def->key); free(def->key); free(def->val); def->key = def->val = NULL; def->keysz = def->valsz = 0; return; } free(def->val); def->val = mandoc_strndup(start, sz); def->valsz = sz; } /* * Recursively parse an eqn(7) expression. */ static enum rofferr eqn_parse(struct eqn_node *ep, struct eqn_box *parent) { char sym[64]; struct eqn_box *cur; const char *start; char *p; size_t i, sz; enum eqn_tok tok, subtok; enum eqn_post pos; int size; assert(parent != NULL); /* * Empty equation. * Do not add it to the high-level syntax tree. */ if (ep->data == NULL) return ROFF_IGN; next_tok: tok = eqn_tok_parse(ep, &p); this_tok: switch (tok) { case EQN_TOK_UNDEF: eqn_undef(ep); break; case EQN_TOK_NDEFINE: case EQN_TOK_DEFINE: eqn_def(ep); break; case EQN_TOK_TDEFINE: if (eqn_nextrawtok(ep, NULL) == NULL || eqn_next(ep, ep->data[(int)ep->cur], NULL, 0) == NULL) mandoc_msg(MANDOCERR_REQ_EMPTY, ep->parse, ep->eqn.ln, ep->eqn.pos, "tdefine"); break; case EQN_TOK_DELIM: eqn_delim(ep); break; case EQN_TOK_GFONT: if (eqn_nextrawtok(ep, NULL) == NULL) mandoc_msg(MANDOCERR_REQ_EMPTY, ep->parse, ep->eqn.ln, ep->eqn.pos, eqn_toks[tok]); break; case EQN_TOK_MARK: case EQN_TOK_LINEUP: /* Ignore these. */ break; case EQN_TOK_DYAD: case EQN_TOK_VEC: case EQN_TOK_UNDER: case EQN_TOK_BAR: case EQN_TOK_TILDE: case EQN_TOK_HAT: case EQN_TOK_DOT: case EQN_TOK_DOTDOT: if (parent->last == NULL) { mandoc_msg(MANDOCERR_EQN_NOBOX, ep->parse, ep->eqn.ln, ep->eqn.pos, eqn_toks[tok]); cur = eqn_box_alloc(ep, parent); cur->type = EQN_TEXT; cur->text = mandoc_strdup(""); } parent = eqn_box_makebinary(ep, EQNPOS_NONE, parent); parent->type = EQN_LISTONE; parent->expectargs = 1; switch (tok) { case EQN_TOK_DOTDOT: strlcpy(sym, "\\[ad]", sizeof(sym)); break; case EQN_TOK_VEC: strlcpy(sym, "\\[->]", sizeof(sym)); break; case EQN_TOK_DYAD: strlcpy(sym, "\\[<>]", sizeof(sym)); break; case EQN_TOK_TILDE: strlcpy(sym, "\\[a~]", sizeof(sym)); break; case EQN_TOK_UNDER: strlcpy(sym, "\\[ul]", sizeof(sym)); break; case EQN_TOK_BAR: strlcpy(sym, "\\[rl]", sizeof(sym)); break; case EQN_TOK_DOT: strlcpy(sym, "\\[a.]", sizeof(sym)); break; case EQN_TOK_HAT: strlcpy(sym, "\\[ha]", sizeof(sym)); break; default: abort(); } switch (tok) { case EQN_TOK_DOTDOT: case EQN_TOK_VEC: case EQN_TOK_DYAD: case EQN_TOK_TILDE: case EQN_TOK_BAR: case EQN_TOK_DOT: case EQN_TOK_HAT: parent->top = mandoc_strdup(sym); break; case EQN_TOK_UNDER: parent->bottom = mandoc_strdup(sym); break; default: abort(); } parent = parent->parent; break; case EQN_TOK_FWD: case EQN_TOK_BACK: case EQN_TOK_DOWN: case EQN_TOK_UP: subtok = eqn_tok_parse(ep, NULL); if (subtok != EQN_TOK__MAX) { mandoc_msg(MANDOCERR_REQ_EMPTY, ep->parse, ep->eqn.ln, ep->eqn.pos, eqn_toks[tok]); tok = subtok; goto this_tok; } break; case EQN_TOK_FAT: case EQN_TOK_ROMAN: case EQN_TOK_ITALIC: case EQN_TOK_BOLD: while (parent->args == parent->expectargs) parent = parent->parent; /* * These values apply to the next word or sequence of * words; thus, we mark that we'll have a child with * exactly one of those. */ parent = eqn_box_alloc(ep, parent); parent->type = EQN_LISTONE; parent->expectargs = 1; switch (tok) { case EQN_TOK_FAT: parent->font = EQNFONT_FAT; break; case EQN_TOK_ROMAN: parent->font = EQNFONT_ROMAN; break; case EQN_TOK_ITALIC: parent->font = EQNFONT_ITALIC; break; case EQN_TOK_BOLD: parent->font = EQNFONT_BOLD; break; default: abort(); } break; case EQN_TOK_SIZE: case EQN_TOK_GSIZE: /* Accept two values: integral size and a single. */ if (NULL == (start = eqn_nexttok(ep, &sz))) { mandoc_msg(MANDOCERR_REQ_EMPTY, ep->parse, ep->eqn.ln, ep->eqn.pos, eqn_toks[tok]); break; } size = mandoc_strntoi(start, sz, 10); if (-1 == size) { mandoc_msg(MANDOCERR_IT_NONUM, ep->parse, ep->eqn.ln, ep->eqn.pos, eqn_toks[tok]); break; } if (EQN_TOK_GSIZE == tok) { ep->gsize = size; break; } parent = eqn_box_alloc(ep, parent); parent->type = EQN_LISTONE; parent->expectargs = 1; parent->size = size; break; case EQN_TOK_FROM: case EQN_TOK_TO: case EQN_TOK_SUB: case EQN_TOK_SUP: /* * We have a left-right-associative expression. * Repivot under a positional node, open a child scope * and keep on reading. */ if (parent->last == NULL) { mandoc_msg(MANDOCERR_EQN_NOBOX, ep->parse, ep->eqn.ln, ep->eqn.pos, eqn_toks[tok]); cur = eqn_box_alloc(ep, parent); cur->type = EQN_TEXT; cur->text = mandoc_strdup(""); } /* Handle the "subsup" and "fromto" positions. */ if (EQN_TOK_SUP == tok && parent->pos == EQNPOS_SUB) { parent->expectargs = 3; parent->pos = EQNPOS_SUBSUP; break; } if (EQN_TOK_TO == tok && parent->pos == EQNPOS_FROM) { parent->expectargs = 3; parent->pos = EQNPOS_FROMTO; break; } switch (tok) { case EQN_TOK_FROM: pos = EQNPOS_FROM; break; case EQN_TOK_TO: pos = EQNPOS_TO; break; case EQN_TOK_SUP: pos = EQNPOS_SUP; break; case EQN_TOK_SUB: pos = EQNPOS_SUB; break; default: abort(); } parent = eqn_box_makebinary(ep, pos, parent); break; case EQN_TOK_SQRT: while (parent->args == parent->expectargs) parent = parent->parent; /* * Accept a left-right-associative set of arguments just * like sub and sup and friends but without rebalancing * under a pivot. */ parent = eqn_box_alloc(ep, parent); parent->type = EQN_SUBEXPR; parent->pos = EQNPOS_SQRT; parent->expectargs = 1; break; case EQN_TOK_OVER: /* * We have a right-left-associative fraction. * Close out anything that's currently open, then * rebalance and continue reading. */ if (parent->last == NULL) { mandoc_msg(MANDOCERR_EQN_NOBOX, ep->parse, ep->eqn.ln, ep->eqn.pos, eqn_toks[tok]); cur = eqn_box_alloc(ep, parent); cur->type = EQN_TEXT; cur->text = mandoc_strdup(""); } while (EQN_SUBEXPR == parent->type) parent = parent->parent; parent = eqn_box_makebinary(ep, EQNPOS_OVER, parent); break; case EQN_TOK_RIGHT: case EQN_TOK_BRACE_CLOSE: /* * Close out the existing brace. * FIXME: this is a shitty sentinel: we should really * have a native EQN_BRACE type or whatnot. */ for (cur = parent; cur != NULL; cur = cur->parent) if (cur->type == EQN_LIST && (tok == EQN_TOK_BRACE_CLOSE || cur->left != NULL)) break; if (cur == NULL) { mandoc_msg(MANDOCERR_BLK_NOTOPEN, ep->parse, ep->eqn.ln, ep->eqn.pos, eqn_toks[tok]); break; } parent = cur; if (EQN_TOK_RIGHT == tok) { if (NULL == (start = eqn_nexttok(ep, &sz))) { mandoc_msg(MANDOCERR_REQ_EMPTY, ep->parse, ep->eqn.ln, ep->eqn.pos, eqn_toks[tok]); break; } /* Handling depends on right/left. */ if (STRNEQ(start, sz, "ceiling", 7)) { strlcpy(sym, "\\[rc]", sizeof(sym)); parent->right = mandoc_strdup(sym); } else if (STRNEQ(start, sz, "floor", 5)) { strlcpy(sym, "\\[rf]", sizeof(sym)); parent->right = mandoc_strdup(sym); } else parent->right = mandoc_strndup(start, sz); } parent = parent->parent; if (tok == EQN_TOK_BRACE_CLOSE && (parent->type == EQN_PILE || parent->type == EQN_MATRIX)) parent = parent->parent; /* Close out any "singleton" lists. */ while (parent->type == EQN_LISTONE && parent->args == parent->expectargs) parent = parent->parent; break; case EQN_TOK_BRACE_OPEN: case EQN_TOK_LEFT: /* * If we already have something in the stack and we're * in an expression, then rewind til we're not any more * (just like with the text node). */ while (parent->args == parent->expectargs) parent = parent->parent; if (EQN_TOK_LEFT == tok && (start = eqn_nexttok(ep, &sz)) == NULL) { mandoc_msg(MANDOCERR_REQ_EMPTY, ep->parse, ep->eqn.ln, ep->eqn.pos, eqn_toks[tok]); break; } parent = eqn_box_alloc(ep, parent); parent->type = EQN_LIST; if (EQN_TOK_LEFT == tok) { if (STRNEQ(start, sz, "ceiling", 7)) { strlcpy(sym, "\\[lc]", sizeof(sym)); parent->left = mandoc_strdup(sym); } else if (STRNEQ(start, sz, "floor", 5)) { strlcpy(sym, "\\[lf]", sizeof(sym)); parent->left = mandoc_strdup(sym); } else parent->left = mandoc_strndup(start, sz); } break; case EQN_TOK_PILE: case EQN_TOK_LPILE: case EQN_TOK_RPILE: case EQN_TOK_CPILE: case EQN_TOK_CCOL: case EQN_TOK_LCOL: case EQN_TOK_RCOL: while (parent->args == parent->expectargs) parent = parent->parent; parent = eqn_box_alloc(ep, parent); parent->type = EQN_PILE; parent->expectargs = 1; break; case EQN_TOK_ABOVE: for (cur = parent; cur != NULL; cur = cur->parent) if (cur->type == EQN_PILE) break; if (cur == NULL) { mandoc_msg(MANDOCERR_IT_STRAY, ep->parse, ep->eqn.ln, ep->eqn.pos, eqn_toks[tok]); break; } parent = eqn_box_alloc(ep, cur); parent->type = EQN_LIST; break; case EQN_TOK_MATRIX: while (parent->args == parent->expectargs) parent = parent->parent; parent = eqn_box_alloc(ep, parent); parent->type = EQN_MATRIX; parent->expectargs = 1; break; case EQN_TOK_EOF: /* * End of file! * TODO: make sure we're not in an open subexpression. */ return ROFF_EQN; case EQN_TOK_FUNC: case EQN_TOK__MAX: assert(p != NULL); /* * If we already have something in the stack and we're * in an expression, then rewind til we're not any more. */ while (parent->args == parent->expectargs) parent = parent->parent; if (tok == EQN_TOK_FUNC) { for (cur = parent; cur != NULL; cur = cur->parent) if (cur->font != EQNFONT_NONE) break; if (cur == NULL || cur->font != EQNFONT_ROMAN) { parent = eqn_box_alloc(ep, parent); parent->type = EQN_LISTONE; parent->font = EQNFONT_ROMAN; parent->expectargs = 1; } } cur = eqn_box_alloc(ep, parent); cur->type = EQN_TEXT; for (i = 0; i < EQNSYM__MAX; i++) if (0 == strcmp(eqnsyms[i].str, p)) { (void)snprintf(sym, sizeof(sym), "\\[%s]", eqnsyms[i].sym); cur->text = mandoc_strdup(sym); free(p); break; } if (i == EQNSYM__MAX) cur->text = p; /* * Post-process list status. */ while (parent->type == EQN_LISTONE && parent->args == parent->expectargs) parent = parent->parent; break; default: abort(); } goto next_tok; } enum rofferr eqn_end(struct eqn_node **epp) { struct eqn_node *ep; ep = *epp; *epp = NULL; ep->eqn.root = mandoc_calloc(1, sizeof(struct eqn_box)); ep->eqn.root->expectargs = UINT_MAX; return eqn_parse(ep, ep->eqn.root); } 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->data); free(p->defs); free(p); }