On Tue, Sep 17, 2019 at 2:52 PM Marcel Fabian Krüger <t...@2krueger.de>
wrote:
> Hi,
>
> the node(.direct).uses_font helpers currently always return false for
> glyph nodes:
> In the implementation
>
> static int lua_nodelib_direct_uses_font(lua_State * L)
> {
> halfword n = lua_tointeger(L,1);
> halfword f = lua_tointeger(L,2);
> halfword p;
> if (type(n) == glyph_node) {
> lua_pushboolean(L,font(n) == f);
> } else if (type(n) == disc_node) {
> uses_font_disc(pre_break,p,n);
> uses_font_disc(post_break,p,n);
> uses_font_disc(no_break,p,n);
> }
> /* todo: other node types */
> lua_pushboolean(L,0);
> return 1;
> }
>
> the actual result is first calculated, but then the last pushboolean
> pushes a `false` on top of the stack and return this false.
> It could e.g. be fixed by adding a `return 1;` at the end of the first
> if block. `disc` nodes are not affected because uses_font_disc is a
> macro containing `return`.
>
> A minimal example in plain LuaTeX:
>
> \directlua{
> local g = node.new'glyph'
> g.font = font.current()
> if not node.uses_font(g, font.current()) then
> error'This should not happen'
> end
> node.free(g)
> }
> \bye
>
>
hm, probably a missed else, ie
} else {
/* todo: other node types */
lua_pushboolean(L,0);
}
--
luigi
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