Single `<text>` node fails to be parsed

[Daaiid]

Bug found during PR #967. See PR for additional details.

The following SVG document with a single text node doesn't get parsed as expected:

<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'>
   <text x='20' y='35'>Some Text</text>
 </svg>

The resulting Tree has no children. Debugging the parsing sequence revealed that the core XML is parsed correctly but parsing it to SVG seems to be erroneous.

A failing test to reproduce the issue:

#[test]
fn has_text_nodes() {
    let svg = "
    <svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'>
        <text x='20' y='35'>Some Text</text>
    </svg>
    ";

    let tree = usvg::Tree::from_str(&svg, &usvg::Options::default()).unwrap();
    assert!(tree.root().has_children());
    assert!(tree.has_text_nodes());
}

[RazrFalcon]

Works fine to me. My guess would be that you run Linux and do not have Times New Roman installed.

Or maybe you have disabled the text build feature.

[santhoshtr]

I can reproduce the issue. Also fails when text is inside group node:

  <g transform="translate(272.352371 -67.908951)" style="fill: rgb(0.000000%,0.000000%,0.000000%);">
    <text font-size="9.962646">top</text>
  </g>

Group node reports children as []

[LaurenzV]

I can't reproduce it either, so the issue probably must be something as @RazrFalcon suggested.

[LaurenzV]

Actually, it can't work, because you are not loading any fonts. You would have to do something like this:

#[test]
fn has_text_nodes() {
    let svg = "
    <svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'>
        <text x='20' y='35'>Some Text</text>
    </svg>
    ";

    let mut options = usvg::Options::default();
    options.fontdb_mut().load_system_fonts();
    let tree = usvg::Tree::from_str(&svg, &options).unwrap();
    assert!(tree.root().has_children());
    assert!(tree.has_text_nodes());
}

I guess this should be better documented.

[santhoshtr]

Thanks that worked for me. Adding options.fontdb_mut().load_system_fonts(); helped. However, as I am using usvg just for the purpose of data extraction from an svg, load_system_fonts call is strange to read in the code.

[LaurenzV]

Well, you can also load your custom fonts (see the various methods available). But you need to use some font, otherwise the text nodes can't be resolved.