perspective 2.0.0

A data visualization and analytics component, especially well-suited for large and/or streaming datasets.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54

////////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2018, the Perspective Authors.
//
// This file is part of the Perspective library, distributed under the terms
// of the Apache License 2.0.  The full license can be found in the LICENSE
// file.

use itertools::Itertools;

static VERSION: &str = env!("PKG_VERSION");

fn render_plugin(tag_name: impl AsRef<str>) -> String {
    format!(
        "import \"https://cdn.jsdelivr.net/npm/@finos/{0}@{1}/dist/cdn/{0}.js\";\n",
        tag_name.as_ref(),
        VERSION
    )
}

pub fn render(data: &str, layout: &str, plugins: &[String]) -> String {
    let stmts = plugins.iter().map(render_plugin);
    let imports = Itertools::intersperse(stmts, " ".to_owned()).collect::<String>();

    format!("
<!DOCTYPE html lang=\"en\">
<html>
<head>
<meta name=\"viewport\" content=\"width=device-width,initial-scale=1,maximum-scale=1,minimum-scale=1,user-scalable=no\"/>
<link rel=\"stylesheet\" crossorigin=\"anonymous\" href=\"https://cdn.jsdelivr.net/npm/@finos/perspective-viewer@{0}/dist/css/themes.css\"/>
<script type=\"module\">
import perspective from \"https://cdn.jsdelivr.net/npm/@finos/perspective@{0}/dist/cdn/perspective.js\";
import \"https://cdn.jsdelivr.net/npm/@finos/perspective-viewer@{0}/dist/cdn/perspective-viewer.js\";
{3}
const worker = perspective.worker();
const binary_string = window.atob(window.data.textContent);
const len = binary_string.length;
const bytes = new Uint8Array(len);
for (let i = 0; i < len; i++) {{
bytes[i] = binary_string.charCodeAt(i);
}}
window.viewer.load(worker.table(bytes.buffer));
window.viewer.restore(JSON.parse(window.layout.textContent));
</script>
<style>perspective-viewer{{position:absolute;top:0;left:0;right:0;bottom:0}}</style>
</head>
<body>
<script id='data' type=\"application/octet-stream\">{1}</script>
<script id='layout' type=\"application/json\">{2}</script>
<perspective-viewer id='viewer'></perspective-viewer>
</body>
</html>
", VERSION, data, layout, imports)
}