Add initial EQN support to mandoc. This parses, then throws away, data

[mandoc.git] / roff.c

diff --git a/roff.c b/roff.c
index ad7a08aeca39239126f7169ed730a245b75e5a32..7d76fb563d517bf25bbe7f2d45cd1fd69f30d907 100644 (file)
--- a/roff.c
+++ b/roff.c
@@ -1,4 +1,4 @@
-/*     $Id: roff.c,v 1.123 2011/01/22 13:16:02 schwarze Exp $ */
+/*     $Id: roff.c,v 1.125 2011/02/06 20:36:36 kristaps Exp $ */
 /*
  * Copyright (c) 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2010, 2011 Ingo Schwarze <schwarze@openbsd.org>
@@ -55,12 +55,17 @@ enum        rofft {
        ROFF_ne,
        ROFF_nh,
        ROFF_nr,
+       ROFF_ns,
+       ROFF_ps,
        ROFF_rm,
        ROFF_so,
+       ROFF_ta,
        ROFF_tr,
        ROFF_TS,
        ROFF_TE,
        ROFF_T_,
+       ROFF_EQ,
+       ROFF_EN,
        ROFF_cblock,
        ROFF_ccond, /* FIXME: remove this. */
        ROFF_USERDEF,
@@ -90,6 +95,9 @@ struct        roff {
        struct tbl_node *first_tbl; /* first table parsed */
        struct tbl_node *last_tbl; /* last table parsed */
        struct tbl_node *tbl; /* current table being parsed */
+       struct eqn_node *last_eqn; /* last equation parsed */
+       struct eqn_node *first_eqn; /* first equation parsed */
+       struct eqn_node *eqn; /* current equation being parsed */
 };
 
 struct roffnode {
@@ -148,6 +156,8 @@ static      void             roff_setstr(struct roff *,
 static enum rofferr     roff_so(ROFF_ARGS);
 static enum rofferr     roff_TE(ROFF_ARGS);
 static enum rofferr     roff_TS(ROFF_ARGS);
+static enum rofferr     roff_EQ(ROFF_ARGS);
+static enum rofferr     roff_EN(ROFF_ARGS);
 static enum rofferr     roff_T_(ROFF_ARGS);
 static enum rofferr     roff_userdef(ROFF_ARGS);
 
@@ -177,12 +187,17 @@ static    struct roffmac   roffs[ROFF_MAX] = {
        { "ne", roff_line_ignore, NULL, NULL, 0, NULL },
        { "nh", roff_line_ignore, NULL, NULL, 0, NULL },
        { "nr", roff_nr, NULL, NULL, 0, NULL },
+       { "ns", roff_line_ignore, NULL, NULL, 0, NULL },
+       { "ps", roff_line_ignore, NULL, NULL, 0, NULL },
        { "rm", roff_rm, NULL, NULL, 0, NULL },
        { "so", roff_so, NULL, NULL, 0, NULL },
+       { "ta", roff_line_ignore, NULL, NULL, 0, NULL },
        { "tr", roff_line_ignore, NULL, NULL, 0, NULL },
        { "TS", roff_TS, NULL, NULL, 0, NULL },
        { "TE", roff_TE, NULL, NULL, 0, NULL },
        { "T&", roff_T_, NULL, NULL, 0, NULL },
+       { "EQ", roff_EQ, NULL, NULL, 0, NULL },
+       { "EN", roff_EN, NULL, NULL, 0, NULL },
        { ".", roff_cblock, NULL, NULL, 0, NULL },
        { "\\}", roff_ccond, NULL, NULL, 0, NULL },
        { NULL, roff_userdef, NULL, NULL, 0, NULL },
@@ -305,15 +320,22 @@ static void
 roff_free1(struct roff *r)
 {
        struct tbl_node *t;
+       struct eqn_node *e;
 
-       while (r->first_tbl) {
-               t = r->first_tbl;
+       while (NULL != (t = r->first_tbl)) {
                r->first_tbl = t->next;
                tbl_free(t);
        }
 
        r->first_tbl = r->last_tbl = r->tbl = NULL;
 
+       while (NULL != (e = r->first_eqn)) {
+               r->first_eqn = e->next;
+               eqn_free(e);
+       }
+
+       r->first_eqn = r->last_eqn = r->eqn = NULL;
+
        while (r->last)
                roffnode_pop(r);
 
@@ -471,6 +493,8 @@ roff_parseln(struct roff *r, int ln, char **bufp,
         * First, if a scope is open and we're not a macro, pass the
         * text through the macro's filter.  If a scope isn't open and
         * we're not a macro, just let it through.
+        * Finally, if there's an equation scope open, divert it into it
+        * no matter our state.
         */
 
        if (r->last && ! ROFF_CTL((*bufp)[pos])) {
@@ -479,18 +503,26 @@ roff_parseln(struct roff *r, int ln, char **bufp,
                e = (*roffs[t].text)
                        (r, t, bufp, szp, ln, pos, pos, offs);
                assert(ROFF_IGN == e || ROFF_CONT == e);
-               if (ROFF_CONT == e && r->tbl)
+               if (ROFF_CONT != e)
+                       return(e);
+               if (r->eqn)
+                       return(eqn_read(&r->eqn, ln, *bufp, *offs));
+               if (r->tbl)
                        return(tbl_read(r->tbl, ln, *bufp, *offs));
-               return(e);
+               return(ROFF_CONT);
        } else if ( ! ROFF_CTL((*bufp)[pos])) {
+               if (r->eqn)
+                       return(eqn_read(&r->eqn, ln, *bufp, *offs));
                if (r->tbl)
                        return(tbl_read(r->tbl, ln, *bufp, *offs));
                return(ROFF_CONT);
-       }
+       } else if (r->eqn)
+               return(eqn_read(&r->eqn, ln, *bufp, *offs));
 
        /*
         * If a scope is open, go to the child handler for that macro,
         * as it may want to preprocess before doing anything with it.
+        * Don't do so if an equation is open.
         */
 
        if (r->last) {
@@ -526,6 +558,13 @@ roff_endparse(struct roff *r)
                (*r->msg)(MANDOCERR_SCOPEEXIT, r->data,
                                r->last->line, r->last->col, NULL);
 
+       if (r->eqn) {
+               (*r->msg)(MANDOCERR_SCOPEEXIT, r->data, 
+                               r->eqn->line, r->eqn->pos, NULL);
+               eqn_end(r->eqn);
+               r->eqn = NULL;
+       }
+
        if (r->tbl) {
                (*r->msg)(MANDOCERR_SCOPEEXIT, r->data, 
                                r->tbl->line, r->tbl->pos, NULL);
@@ -1132,6 +1171,33 @@ roff_T_(ROFF_ARGS)
        return(ROFF_IGN);
 }
 
+/* ARGSUSED */
+static enum rofferr
+roff_EQ(ROFF_ARGS)
+{
+       struct eqn_node *e;
+
+       assert(NULL == r->eqn);
+       e = eqn_alloc(ppos, ln);
+
+       if (r->last_eqn)
+               r->last_eqn->next = e;
+       else
+               r->first_eqn = r->last_eqn = e;
+
+       r->eqn = r->last_eqn = e;
+       return(ROFF_IGN);
+}
+
+/* ARGSUSED */
+static enum rofferr
+roff_EN(ROFF_ARGS)
+{
+
+       (*r->msg)(MANDOCERR_NOSCOPE, r->data, ln, ppos, NULL);
+       return(ROFF_IGN);
+}
+
 /* ARGSUSED */
 static enum rofferr
 roff_TS(ROFF_ARGS)
@@ -1234,7 +1300,6 @@ roff_userdef(ROFF_ARGS)
           ROFF_REPARSE : ROFF_APPEND);
 }
 
-
 static char *
 roff_getname(struct roff *r, char **cpp, int ln, int pos)
 {
@@ -1268,7 +1333,6 @@ roff_getname(struct roff *r, char **cpp, int ln, int pos)
        return(name);
 }
 
-
 /*
  * Store *string into the user-defined string called *name.
  * In multiline mode, append to an existing entry and append '\n';
@@ -1338,7 +1402,6 @@ roff_setstr(struct roff *r, const char *name, const char *string,
        *c = '\0';
 }
 
-
 static const char *
 roff_getstrn(const struct roff *r, const char *name, size_t len)
 {
@@ -1351,7 +1414,6 @@ roff_getstrn(const struct roff *r, const char *name, size_t len)
        return(n ? n->string : NULL);
 }
 
-
 static void
 roff_freestr(struct roff *r)
 {
@@ -1373,3 +1435,10 @@ roff_span(const struct roff *r)
        
        return(r->tbl ? tbl_span(r->tbl) : NULL);
 }
+
+const struct eqn *
+roff_eqn(const struct roff *r)
+{
+       
+       return(r->last_eqn ? &r->last_eqn->eqn : NULL);
+}