Fix lexing of octal literals.

src/lexer/numbers.js

@@ -35,7 +35,13 @@ module.exports = {
         } else {
           this.unput(ch ? 2 : 1);
         }
-        // @fixme check octal notation ? not usefull
+      } else if (ch === "o" || ch === "O") {
+        ch = this.input();
+        if (ch !== "_" && this.is_OCTAL()) {
+          return this.consume_ONUM();
+        } else {
+          this.unput(ch ? 2 : 1);
+        }
       } else if (!this.is_NUM()) {
         if (ch) this.unput(1);
       }
@@ -151,4 +157,15 @@ module.exports = {
     }
     return this.tok.T_LNUMBER;
   },
+  // read an octal number
+  consume_ONUM: function () {
+    while (this.offset < this.size) {
+      const ch = this.input();
+      if (!this.is_OCTAL()) {
+        if (ch) this.unput(1);
+        break;
+      }
+    }
+    return this.tok.T_LNUMBER;
+  },
 };

src/lexer/utils.js

@@ -99,4 +99,14 @@ module.exports = {
     // else
     return false;
   },
+  // check if current char can be an octal number
+  is_OCTAL: function () {
+    const ch = this._input.charCodeAt(this.offset - 1);
+    // 0 - 7
+    if (ch > 47 && ch < 56) return true;
+    // _ (code 95)
+    if (ch === 95) return true;
+    // else
+    return false;
+  },
 };