diff options
| -rw-r--r-- | eqn.c | 28 | ||||
| -rw-r--r-- | mandoc.h | 2 |
2 files changed, 25 insertions, 5 deletions
@@ -198,6 +198,7 @@ static const struct eqnstr eqnposs[EQNPOS__MAX] = { { "", 0 }, /* EQNPOS_NONE */ { "over", 4 }, /* EQNPOS_OVER */ { "sup", 3 }, /* EQNPOS_SUP */ + { NULL, 0 }, /* EQNPOS_SUPSUB */ { "sub", 3 }, /* EQNPOS_SUB */ { "to", 2 }, /* EQNPOS_TO */ { "from", 4 }, /* EQNPOS_FROM */ @@ -569,14 +570,30 @@ eqn_box(struct eqn_node *ep, struct eqn_box *last) return(EQN_OK); } + /* + * Positional elements (e.g., over, sub, sup, ...). + */ for (i = 0; i < (int)EQNPOS__MAX; i++) { - if ( ! EQNSTREQ(&eqnposs[i], start, sz)) + /* Some elements don't have names (are virtual). */ + if (NULL == eqnposs[i].name) + continue; + else 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 we encounter x sub y sup z, then according to the + * eqn manual, we regard this as x subsup y z. + */ + if (EQNPOS_SUP == i && + NULL != last->last->prev && + EQNPOS_SUB == last->last->prev->pos) + last->last->prev->pos = EQNPOS_SUBSUP; + else + last->last->pos = (enum eqn_post)i; + if (EQN_EOF == (c = eqn_box(ep, last))) { EQN_MSG(MANDOCERR_EQNEOF, ep); return(EQN_ERR); @@ -665,10 +682,11 @@ eqn_box_alloc(struct eqn_node *ep, struct eqn_box *parent) bp->parent = parent; bp->size = ep->gsize; - if (NULL == parent->first) - parent->first = bp; - else + if (NULL != parent->first) { parent->last->next = bp; + bp->prev = parent->last; + } else + parent->first = bp; parent->last = bp; return(bp); @@ -336,6 +336,7 @@ enum eqn_post { EQNPOS_NONE = 0, EQNPOS_OVER, EQNPOS_SUP, + EQNPOS_SUBSUP, EQNPOS_SUB, EQNPOS_TO, EQNPOS_FROM, @@ -366,6 +367,7 @@ struct eqn_box { struct eqn_box *first; /* first child node */ struct eqn_box *last; /* last child node */ struct eqn_box *next; /* node sibling */ + struct eqn_box *prev; /* node sibling */ struct eqn_box *parent; /* node sibling */ char *text; /* text (or NULL) */ char *left; |