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@@ -0,0 +1,50 @@
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+"use strict";
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+
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+// Type letters to see matches narrow; backspace to undo; Ctrl+C to quit.
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+// Usage: node demo.js
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+
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+const fs = require("fs");
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+const path = require("path");
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+const { Predictor } = require("./predictor");
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+
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+const { words } = JSON.parse(
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+ fs.readFileSync(path.join(__dirname, "wordlist.json"), "utf8")
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+);
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+const predictor = new Predictor(words);
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+
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+let prefix = "";
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+
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+function render() {
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+ const { matches, isWord, completion } = predictor.predict(prefix);
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+ console.clear();
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+ console.log(`typed: ${prefix || "(nothing yet)"}`);
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+ if (completion) {
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+ console.log(`-> unique match: ${completion}`);
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+ } else if (matches.length === 0) {
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+ console.log("-> no matches");
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+ } else {
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+ const shown = matches.slice(0, 15);
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+ console.log(
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+ `-> ${matches.length} matches: ${shown.join(", ")}` +
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+ (matches.length > shown.length ? ", ..." : "")
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+ );
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+ }
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+ if (isWord && matches.length > 1) {
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+ console.log(` (note: "${prefix}" is itself a word, but is also a prefix of others)`);
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+ }
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+}
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+
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+process.stdin.setRawMode(true);
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+process.stdin.resume();
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+process.stdin.setEncoding("utf8");
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+render();
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+
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+process.stdin.on("data", (key) => {
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+ if (key === "\u0003") process.exit(0); // Ctrl+C
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+ if (key === "\u007f" || key === "\b") {
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+ prefix = prefix.slice(0, -1);
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+ } else if (/^[a-z]$/i.test(key)) {
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+ prefix += key.toLowerCase();
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+ }
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+ render();
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+});
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