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Date: Fri, 23 Jun 2017 23:24:09 +0200
From: Ingo Schwarze <schwarze@usta.de>
To: "Anthony J. Bentley" <anthony@anjbe.name>, tech@mdocml.bsd.lv
Subject: Re: MathML and <mo>, <mi>, <mn>
Message-ID: <20170623212409.GB33360@athene.usta.de>
References: <45090.1497945869@cathet.us>
 <20170623025712.GE77030@athene.usta.de>
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In-Reply-To: <20170623025712.GE77030@athene.usta.de>
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Hi Anthony,

Ingo Schwarze wrote on Fri, Jun 23, 2017 at 04:57:12AM +0200:
> Anthony J. Bentley wrote on Tue, Jun 20, 2017 at 02:04:29AM -0600:

>> Consider the quadratic formula:
>> x={-b +- sqrt{b sup 2 - 4ac}} over 2a

> After committing the patch appended below, mandoc now renders
> as follows:
> 
>   <mrow>
>     <mi>x</mi>  <!-- new identifier/operator splitting -->
>     <mo>=</mo>  <!-- new operator element -->
>     <mfrac>
>       <mrow>
[...]
>       </mrow>
>       <mn>2</mn>  <!-- XXX oops, do we need a row here? -->
>       <mi>a</mi>
>     </mfrac>
>   </mrow>

I just fixed this with the following commit, to render as:

        </mrow>
        <mrow>
          <mn>2</mn>
          <mi>a</mi>
        </mrow>
      </mfrac>

Yours,
  Ingo


Log Message:
-----------
splitting a text box sometimes requires wrapping it in a list

Modified Files:
--------------
    mandoc:
        eqn.c

Revision Data
-------------
Index: eqn.c
===================================================================
RCS file: /home/cvs/mandoc/mandoc/eqn.c,v
retrieving revision 1.68
retrieving revision 1.69
diff -Leqn.c -Leqn.c -u -p -r1.68 -r1.69
--- eqn.c
+++ eqn.c
@@ -1139,7 +1139,25 @@ this_tok:
 					break;
 				if (ccln == ccl)
 					continue;
-				/* Boundary found, add a new box. */
+				/* Boundary found, split the text. */
+				if (parent->args == parent->expectargs) {
+					/* Remove the text from the tree. */
+					if (cur->prev == NULL)
+						parent->first = cur->next;
+					else
+						cur->prev->next = NULL;
+					parent->last = cur->prev;
+					parent->args--;
+					/* Set up a list instead. */
+					nbox = eqn_box_alloc(ep, parent);
+					nbox->type = EQN_LIST;
+					/* Insert the word into the list. */
+					nbox->first = nbox->last = cur;
+					cur->parent = nbox;
+					cur->prev = NULL;
+					parent = nbox;
+				}
+				/* Append a new text box. */
 				nbox = eqn_box_alloc(ep, parent);
 				nbox->type = EQN_TEXT;
 				nbox->text = mandoc_strdup(cpn);
--
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