Binary/Octal/Hexadecimal numbers

Author: bigbug

docs/numeric-functions.md

@@ -10,13 +10,15 @@ __Signature:__ `$number(arg)`
 Casts the `arg` parameter to a number using the following casting rules
    - Numbers are unchanged
    - Strings that contain a sequence of characters that represent a legal JSON number are converted to that number
+   - Hexadecimal numbers start with `0x`, Octal numbers with `0o`, binary numbers with `0b`
    - Boolean `true` casts to `1`, Boolean `false` casts to `0`
    - All other values cause an error to be thrown.
 
 If `arg` is not specified (i.e. this function is invoked with no arguments), then the context value is used as the value of `arg`. 
 
 __Examples__  
 - `$number("5")` => `5`  
+- `$number("0x12")` => `0x18`  
 - `["1", "2", "3", "4", "5"].$number()` => `[1, 2, 3, 4, 5]`
 
 

src/functions.js

@@ -1202,6 +1202,8 @@ const functions = (() => {
             result = arg;
         } else if (typeof arg === 'string' && /^-?[0-9]+(\.[0-9]+)?([Ee][-+]?[0-9]+)?$/.test(arg) && !isNaN(parseFloat(arg)) && isFinite(arg)) {
             result = parseFloat(arg);
+        } else if (typeof arg === 'string' && /^(0[xX][0-9A-Fa-f]+)|(0[oO][0-7]+)|(0[bB][0-1]+)$/.test(arg)) {
+            result = Number(arg);
         } else if (arg === true) {
             // boolean true casts to 1
             result = 1;

test/test-suite/groups/function-number/case031.json

@@ -0,0 +1,6 @@
+{
+    "expr": "$number('0x12')",
+    "dataset": null,
+    "bindings": {},
+    "result": 18
+}

test/test-suite/groups/function-number/case032.json

@@ -0,0 +1,6 @@
+{
+    "expr": "$number('0B101')",
+    "dataset": null,
+    "bindings": {},
+    "result": 5
+}

test/test-suite/groups/function-number/case033.json

@@ -0,0 +1,6 @@
+{
+    "expr": "$number('0O12')",
+    "dataset": null,
+    "bindings": {},
+    "result": 10
+}