Initial file commit

Asm65/Number.cs

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+/*
+ * Copyright 2018 faddenSoft
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+using System;
+using System.Diagnostics;
+
+namespace Asm65 {
+    public class Number {
+        /// <summary>
+        /// Parses an integer in a variety of formats (hex, decimal, binary).
+        /// 
+        /// Trim whitespace before calling here.
+        /// </summary>
+        /// <param name="str">String to parse.</param>
+        /// <param name="val">Integer value of string.</param>
+        /// <param name="intBase">What base the string was in (2, 10, or 16).</param>
+        /// <returns>True if the parsing was successful.</returns>
+        public static bool TryParseInt(string str, out int val, out int intBase) {
+            if (string.IsNullOrEmpty(str)) {
+                val = intBase = 0;
+                return false;
+            }
+
+            if (str[0] == '$') {
+                intBase = 16;
+                str = str.Substring(1);     // Convert functions don't like '$'
+            } else if (str.Length > 2 && str[0] == '0' && (str[1] == 'x' || str[1] == 'X')) {
+                intBase = 16;
+            } else if (str[0] == '%') {
+                intBase = 2;
+                str = str.Substring(1);     // Convert functions don't like '%'
+            } else {
+                intBase = 10;               // try it as decimal
+            }
+
+            try {
+                val = Convert.ToInt32(str, intBase);
+                //Debug.WriteLine("GOT " + val + " - " + intBase);
+            } catch (Exception) {
+                //Debug.WriteLine("TryParseInt failed on '" + str + "': " + ex.Message);
+                val = 0;
+                return false;
+            }
+
+            return true;
+        }
+    }
+}