LibJS: Add numeric literal parsing for different bases and exponents

Author: https://github.com/sunverwerth
Commit: 500f6d9e3a
Pull-request: https://github.com/SerenityOS/serenity/pull/1646
Reviewed-by: https://github.com/linusg

Libraries/LibJS/Tests/numeric-literals-basic.js

@@ -0,0 +1,20 @@
+try {
+    assert(0xff === 255);
+    assert(0XFF === 255);
+    assert(0o10 === 8);
+    assert(0O10 === 8);
+    assert(0b10 === 2);
+    assert(0B10 === 2);
+    assert(1e3 === 1000);
+    assert(1e+3 === 1000);
+    assert(1e-3 === 0.001);
+    assert(.1 === 0.1);
+    assert(.1e1 === 1);
+    assert(0.1e1 === 1);
+    assert(.1e+1 === 1);
+    assert(0.1e+1 === 1);
+
+    console.log("PASS");
+} catch (e) {
+    console.log("FAIL: " + e);
+}