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funnbot/zig_gen_typings.js

Created June 15, 2020 03:16
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  1. funnbot renamed this gist Jun 15, 2020. 1 changed file with 0 additions and 0 deletions.
    0 gen_typings.js → zig_gen_typings.js
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    File renamed without changes.
  2. funnbot created this gist Jun 15, 2020.
    83 changes: 83 additions & 0 deletions gen_typings.js
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    Original file line number Diff line number Diff line change
    @@ -0,0 +1,83 @@
    #!/usr/bin/env node

    const fs = require('fs');

    // mmm tasty regex
    const definRegex = /export\s+fn\s+([A-Za-z_][A-Za-z0-9_]*)\s*\(((\s*([A-Za-z_][A-Za-z0-9_]*)\s*:\s*(.+?),?)*)\)\s*(.+?)[ \n\r{]+?/g;
    const paramRegex = /\s*([A-Za-z_][A-Za-z0-9_]*)\s*:\s*([^,]+),?/g;

    run(process.argv);

    function usage(err) {
    if (err !== undefined && err !== "")
    console.log("Error: " + err + "\n");

    console.log("Usage: ./gen_typings.js [file.zig]\n\n\t-o, --output [file.d.ts]\n\t-m, --module [name]\n\t-h, --help\n\t")
    }

    function run(args) {
    if (args.length < 3) return usage("Not enough arguments.");

    let output = "";
    let mod = "typings";
    let input = "";

    let i = 2;
    while (i < args.length) {
    if (args[i] === "-o" || args[i] === "--output") {
    if (++i >= args.length)
    return usage("Expected output file.");
    output = args[i];
    } else if (args[i] === "-m" || args[i] === "--module") {
    if (++i >= args.length)
    return usage("Expected module name.");
    mod = args[i];
    } else if (args[i] === "-h" || args[i] === "--help") {
    return usage();
    } else {
    if (input === "")
    input = args[i];
    else
    return usage("Expected one input file.")
    }
    i++;
    }

    if (input === "")
    return usage("Expected an input file.");

    const dtsFile = parse(input, mod, output);

    if (output === "")
    console.log(dtsFile);
    else
    fs.writeFileSync(output, dtsFile);
    }

    function parse(inputFile, mod) {
    const contents = fs.readFileSync(inputFile).toString();
    const res = [...contents.matchAll(definRegex)];

    let o = `declare module '${mod}' {\n`;

    for (let i = 0; i < res.length; i++) {
    const funcName = res[i][1];
    const params = res[i][2];
    const retType = res[i][6];

    o += ` export function ${funcName}(`;

    const parRes = [...params.matchAll(paramRegex)];
    for (let j = 0; j < parRes.length; j++) {
    o += `${parRes[j][1]}: number`;
    if (j < parRes.length - 1)
    o += ', ';
    }

    o += `): ${retType === "void" ? "void" : "number"};\n`;
    }

    o += `}`;

    return o;
    }