/* $Id: man_macro.c,v 1.14 2010/04/02 11:37:07 schwarze Exp $ */ /* * Copyright (c) 2008, 2009 Kristaps Dzonsons * * 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 #include #include #include #include "libman.h" enum rew { REW_REWIND, REW_NOHALT, REW_HALT }; static int blk_close(MACRO_PROT_ARGS); static int blk_dotted(MACRO_PROT_ARGS); static int blk_exp(MACRO_PROT_ARGS); static int blk_imp(MACRO_PROT_ARGS); static int in_line_eoln(MACRO_PROT_ARGS); static int rew_scope(enum man_type, struct man *, enum mant); static enum rew rew_dohalt(enum mant, enum man_type, const struct man_node *); static enum rew rew_block(enum mant, enum man_type, const struct man_node *); static int rew_warn(struct man *, struct man_node *, enum merr); const struct man_macro __man_macros[MAN_MAX] = { { in_line_eoln, MAN_NSCOPED }, /* br */ { in_line_eoln, 0 }, /* TH */ { blk_imp, MAN_SCOPED }, /* SH */ { blk_imp, MAN_SCOPED }, /* SS */ { blk_imp, MAN_SCOPED | MAN_FSCOPED }, /* TP */ { blk_imp, 0 }, /* LP */ { blk_imp, 0 }, /* PP */ { blk_imp, 0 }, /* P */ { blk_imp, 0 }, /* IP */ { blk_imp, 0 }, /* HP */ { in_line_eoln, MAN_SCOPED }, /* SM */ { in_line_eoln, MAN_SCOPED }, /* SB */ { in_line_eoln, 0 }, /* BI */ { in_line_eoln, 0 }, /* IB */ { in_line_eoln, 0 }, /* BR */ { in_line_eoln, 0 }, /* RB */ { in_line_eoln, MAN_SCOPED }, /* R */ { in_line_eoln, MAN_SCOPED }, /* B */ { in_line_eoln, MAN_SCOPED }, /* I */ { in_line_eoln, 0 }, /* IR */ { in_line_eoln, 0 }, /* RI */ { in_line_eoln, MAN_NSCOPED }, /* na */ { in_line_eoln, 0 }, /* i */ { in_line_eoln, MAN_NSCOPED }, /* sp */ { in_line_eoln, 0 }, /* nf */ { in_line_eoln, 0 }, /* fi */ { in_line_eoln, 0 }, /* r */ { blk_close, 0 }, /* RE */ { blk_exp, MAN_EXPLICIT }, /* RS */ { in_line_eoln, 0 }, /* DT */ { in_line_eoln, 0 }, /* UC */ { in_line_eoln, 0 }, /* PD */ { in_line_eoln, MAN_NSCOPED }, /* Sp */ { in_line_eoln, 0 }, /* Vb */ { in_line_eoln, 0 }, /* Ve */ { blk_exp, MAN_EXPLICIT | MAN_NOCLOSE}, /* de */ { blk_exp, MAN_EXPLICIT | MAN_NOCLOSE}, /* dei */ { blk_exp, MAN_EXPLICIT | MAN_NOCLOSE}, /* am */ { blk_exp, MAN_EXPLICIT | MAN_NOCLOSE}, /* ami */ { blk_exp, MAN_EXPLICIT | MAN_NOCLOSE}, /* ig */ { blk_dotted, 0 }, /* . */ }; const struct man_macro * const man_macros = __man_macros; /* * Warn when "n" is an explicit non-roff macro. */ static int rew_warn(struct man *m, struct man_node *n, enum merr er) { if (er == WERRMAX || MAN_BLOCK != n->type) return(1); if (MAN_VALID & n->flags) return(1); if ( ! (MAN_EXPLICIT & man_macros[n->tok].flags)) return(1); if (MAN_NOCLOSE & man_macros[n->tok].flags) return(1); return(man_nwarn(m, n, er)); } /* * Rewind scope. If a code "er" != WERRMAX has been provided, it will * be used if an explicit block scope is being closed out. */ int man_unscope(struct man *m, const struct man_node *n, enum merr er) { assert(n); /* LINTED */ while (m->last != n) { if ( ! rew_warn(m, m->last, er)) return(0); if ( ! man_valid_post(m)) return(0); if ( ! man_action_post(m)) return(0); m->last = m->last->parent; assert(m->last); } if ( ! rew_warn(m, m->last, er)) return(0); if ( ! man_valid_post(m)) return(0); if ( ! man_action_post(m)) return(0); m->next = MAN_ROOT == m->last->type ? MAN_NEXT_CHILD : MAN_NEXT_SIBLING; return(1); } static enum rew rew_block(enum mant ntok, enum man_type type, const struct man_node *n) { if (MAN_BLOCK == type && ntok == n->parent->tok && MAN_BODY == n->parent->type) return(REW_REWIND); return(ntok == n->tok ? REW_HALT : REW_NOHALT); } /* * There are three scope levels: scoped to the root (all), scoped to the * section (all less sections), and scoped to subsections (all less * sections and subsections). */ static enum rew rew_dohalt(enum mant tok, enum man_type type, const struct man_node *n) { enum rew c; /* We cannot progress beyond the root ever. */ if (MAN_ROOT == n->type) return(REW_HALT); assert(n->parent); /* Normal nodes shouldn't go to the level of the root. */ if (MAN_ROOT == n->parent->type) return(REW_REWIND); /* Already-validated nodes should be closed out. */ if (MAN_VALID & n->flags) return(REW_NOHALT); /* First: rewind to ourselves. */ if (type == n->type && tok == n->tok) return(REW_REWIND); /* * If we're a roff macro, then we can close out anything that * stands between us and our parent context. */ if (MAN_NOCLOSE & man_macros[tok].flags) return(REW_NOHALT); /* * Don't clobber roff macros: this is a bit complicated. If the * current macro is a roff macro, halt immediately and don't * rewind. If it's not, and the parent is, then close out the * current scope and halt at the parent. */ if (MAN_NOCLOSE & man_macros[n->tok].flags) return(REW_HALT); if (MAN_NOCLOSE & man_macros[n->parent->tok].flags) return(REW_REWIND); /* * Next follow the implicit scope-smashings as defined by man.7: * section, sub-section, etc. */ switch (tok) { case (MAN_SH): break; case (MAN_SS): /* Rewind to a section, if a block. */ if (REW_NOHALT != (c = rew_block(MAN_SH, type, n))) return(c); break; case (MAN_RS): /* Rewind to a subsection, if a block. */ if (REW_NOHALT != (c = rew_block(MAN_SS, type, n))) return(c); /* Rewind to a section, if a block. */ if (REW_NOHALT != (c = rew_block(MAN_SH, type, n))) return(c); break; default: /* Rewind to an offsetter, if a block. */ if (REW_NOHALT != (c = rew_block(MAN_RS, type, n))) return(c); /* Rewind to a subsection, if a block. */ if (REW_NOHALT != (c = rew_block(MAN_SS, type, n))) return(c); /* Rewind to a section, if a block. */ if (REW_NOHALT != (c = rew_block(MAN_SH, type, n))) return(c); break; } return(REW_NOHALT); } /* * Rewinding entails ascending the parse tree until a coherent point, * for example, the `SH' macro will close out any intervening `SS' * scopes. When a scope is closed, it must be validated and actioned. */ static int rew_scope(enum man_type type, struct man *m, enum mant tok) { struct man_node *n; enum rew c; /* LINTED */ for (n = m->last; n; n = n->parent) { /* * Whether we should stop immediately (REW_HALT), stop * and rewind until this point (REW_REWIND), or keep * rewinding (REW_NOHALT). */ c = rew_dohalt(tok, type, n); if (REW_HALT == c) return(1); if (REW_REWIND == c) break; } /* * Rewind until the current point. Warn if we're a roff * instruction that's mowing over explicit scopes. */ assert(n); if (MAN_NOCLOSE & man_macros[tok].flags) return(man_unscope(m, n, WROFFSCOPE)); return(man_unscope(m, n, WERRMAX)); } /* * Closure for dotted macros (de, dei, am, ami, ign). This must handle * any of these as the parent node, so it needs special handling. * Beyond this, it's the same as blk_close(). */ /* ARGSUSED */ int blk_dotted(MACRO_PROT_ARGS) { enum mant ntok; struct man_node *nn; /* Check for any of the following parents... */ for (nn = m->last->parent; nn; nn = nn->parent) if (nn->tok == MAN_de || nn->tok == MAN_dei || nn->tok == MAN_am || nn->tok == MAN_ami || nn->tok == MAN_ig) { ntok = nn->tok; break; } if (NULL == nn) { if ( ! man_pwarn(m, line, ppos, WNOSCOPE)) return(0); return(1); } if ( ! rew_scope(MAN_BODY, m, ntok)) return(0); if ( ! rew_scope(MAN_BLOCK, m, ntok)) return(0); /* * Restore flags set when we got here and also stipulate that we * don't post-process the line when exiting the macro op * function in man_pmacro(). See blk_exp(). */ m->flags = m->svflags | MAN_ILINE; m->next = m->svnext; return(1); } /* * Close out a generic explicit macro. */ /* ARGSUSED */ int blk_close(MACRO_PROT_ARGS) { enum mant ntok; const struct man_node *nn; switch (tok) { case (MAN_RE): ntok = MAN_RS; break; default: abort(); /* NOTREACHED */ } for (nn = m->last->parent; nn; nn = nn->parent) if (ntok == nn->tok) break; if (NULL == nn) if ( ! man_pwarn(m, line, ppos, WNOSCOPE)) return(0); if ( ! rew_scope(MAN_BODY, m, ntok)) return(0); if ( ! rew_scope(MAN_BLOCK, m, ntok)) return(0); return(1); } int blk_exp(MACRO_PROT_ARGS) { int w, la; char *p; /* * Close out prior scopes. "Regular" explicit macros cannot be * nested, but we allow roff macros to be placed just about * anywhere. */ if ( ! (MAN_NOCLOSE & man_macros[tok].flags)) { if ( ! rew_scope(MAN_BODY, m, tok)) return(0); if ( ! rew_scope(MAN_BLOCK, m, tok)) return(0); } else { /* * Save our state and next-scope indicator; we restore * it when exiting from the roff instruction block. See * blk_dotted(). */ m->svflags = m->flags; m->svnext = m->next; /* Make sure we drop any line modes. */ m->flags = 0; } if ( ! man_block_alloc(m, line, ppos, tok)) return(0); if ( ! man_head_alloc(m, line, ppos, tok)) return(0); for (;;) { la = *pos; w = man_args(m, line, pos, buf, &p); if (-1 == w) return(0); if (0 == w) break; if ( ! man_word_alloc(m, line, la, p)) return(0); } assert(m); assert(tok != MAN_MAX); if ( ! rew_scope(MAN_HEAD, m, tok)) return(0); return(man_body_alloc(m, line, ppos, tok)); } /* * Parse an implicit-block macro. These contain a MAN_HEAD and a * MAN_BODY contained within a MAN_BLOCK. Rules for closing out other * scopes, such as `SH' closing out an `SS', are defined in the rew * routines. */ int blk_imp(MACRO_PROT_ARGS) { int w, la; char *p; struct man_node *n; /* Close out prior scopes. */ if ( ! rew_scope(MAN_BODY, m, tok)) return(0); if ( ! rew_scope(MAN_BLOCK, m, tok)) return(0); /* Allocate new block & head scope. */ if ( ! man_block_alloc(m, line, ppos, tok)) return(0); if ( ! man_head_alloc(m, line, ppos, tok)) return(0); n = m->last; /* Add line arguments. */ for (;;) { la = *pos; w = man_args(m, line, pos, buf, &p); if (-1 == w) return(0); if (0 == w) break; if ( ! man_word_alloc(m, line, la, p)) return(0); } /* Close out head and open body (unless MAN_SCOPE). */ if (MAN_SCOPED & man_macros[tok].flags) { /* If we're forcing scope (`TP'), keep it open. */ if (MAN_FSCOPED & man_macros[tok].flags) { m->flags |= MAN_BLINE; return(1); } else if (n == m->last) { m->flags |= MAN_BLINE; return(1); } } if ( ! rew_scope(MAN_HEAD, m, tok)) return(0); return(man_body_alloc(m, line, ppos, tok)); } int in_line_eoln(MACRO_PROT_ARGS) { int w, la; char *p; struct man_node *n; if ( ! man_elem_alloc(m, line, ppos, tok)) return(0); n = m->last; for (;;) { la = *pos; w = man_args(m, line, pos, buf, &p); if (-1 == w) return(0); if (0 == w) break; if ( ! man_word_alloc(m, line, la, p)) return(0); } /* * If no arguments are specified and this is MAN_SCOPED (i.e., * next-line scoped), then set our mode to indicate that we're * waiting for terms to load into our context. */ if (n == m->last && MAN_SCOPED & man_macros[tok].flags) { assert( ! (MAN_NSCOPED & man_macros[tok].flags)); m->flags |= MAN_ELINE; return(1); } /* Set ignorable context, if applicable. */ if (MAN_NSCOPED & man_macros[tok].flags) { assert( ! (MAN_SCOPED & man_macros[tok].flags)); m->flags |= MAN_ILINE; } /* * Rewind our element scope. Note that when TH is pruned, we'll * be back at the root, so make sure that we don't clobber as * its sibling. */ for ( ; m->last; m->last = m->last->parent) { if (m->last == n) break; if (m->last->type == MAN_ROOT) break; if ( ! man_valid_post(m)) return(0); if ( ! man_action_post(m)) return(0); } assert(m->last); /* * Same here regarding whether we're back at the root. */ if (m->last->type != MAN_ROOT && ! man_valid_post(m)) return(0); if (m->last->type != MAN_ROOT && ! man_action_post(m)) return(0); m->next = MAN_ROOT == m->last->type ? MAN_NEXT_CHILD : MAN_NEXT_SIBLING; return(1); } int man_macroend(struct man *m) { return(man_unscope(m, m->first, WEXITSCOPE)); }