parser_dev.html (1312198) - rtensor

parser_dev.html

<!doctype html>
<html>
    <head>
        <title>Parser</title>
        <style>
            input[type=text] {
                width: 50vw;
            }
        </style>
    </head>
    <body>
        <p>
            <input id="ttp" type="text" />
            <button id="bpb">parse</button>
            <button id="eeb">eval</button>
            <button id="pfn">postfix</button>
        </p>
        <p><label><input id="doo" type="checkbox" checked /> enable debug output (much faster when off)</label></p>
        <p id="mop">parse first</p>
        <details open><summary>debugging log</summary><p id="log"></p></details>
        <script src="maths_parser.js"></script>
        <script>
            function dl(t) {
                // when i was first testing the parser, i was getting parse times in the tens or hundreds of milliseconds
                // so i was wondering, is it really that slow?
                // no -- it's mostly because of all the debug output
                // if we stub this out, it goes down to 0-5 ms
                if (doe) {
                    document.getElementById("log").innerHTML += t + "<br />";
                }
                return null;
            }
            function udd(ev) {
                doe = ev.target.checked;
            }
            window.onerror = function(ev) {
                dl("ERROR: " + JSON.stringify(ev));
            }
            const oldlog = console.log;
            console.error = console.debug = console.info = console.log = function(v) {
                oldlog(v);
                dl(v);
            };
            let ast;
            let doe;
            udd({ "target": document.getElementById("doo") });
            document.getElementById("bpb").onclick = function() {
                document.getElementById("log").innerText = "";
                const lexer = new TokenStream(document.getElementById("ttp").value);
                dl("about to parse!");
                const start = Date.now();
                ast = NewParser.statement(lexer);
                dl(`received statement ${ast.toString()}`);
                const end = Date.now();
                dl("parsed " + ast);
                document.getElementById("mop").innerText = `parsed in ${end - start} ms (token index ${lexer.tind})\n${ast.toString()}`;
            };
            document.getElementById("eeb").onclick = function() {
                if (ast) {
                    const er = ast.evaluate({}, true);
                    dl(`evaluation result: ${er}`);
                    document.getElementById("mop").innerText = er || "evaluation error";
                } else {
                    document.getElementById("mop").innerText += "!";
                }
            };
            document.getElementById("pfn").onclick = function() {
                if (ast) {
                    document.getElementById("mop").innerText = ast.toPostfix();
                } else {
                    document.getElementById("mop").innerText += "!";
                }
            };
            document.getElementById("doo").onchange = udd;
        </script>
    </body>
</html>

rtensor

Import v2.3-dev from a demonic ritual