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Added parseUnsignedInteger.

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git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@4906 542714f4-19e9-0310-aa3c-eee0fc999fb1
This commit is contained in:
Ray Greenwell
2007-12-13 23:21:04 +00:00
parent 901cb095ae
commit 4a86621196
1 changed files with 75 additions and 38 deletions
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src/as/com/threerings/util/StringUtil.as
+75 -38
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@@ -101,45 +101,28 @@ public class StringUtil
*/
public static function parseInteger (str :String, radix :uint = 0) :int
{
if (str == null) {
throw new ArgumentError("Cannot parseInt(null)");
return int(parseInt0(str, radix, true));
}
/**
* Parse an integer more anally than the built-in parseInt() function,
* throwing an ArgumentError if there are any invalid characters.
*
* The built-in parseInt() will ignore trailing non-integer characters.
*
* @param str The string to parse.
* @param radix The radix to use, from 2 to 16. If not specified the radix will be 10,
* unless the String begins with "0x" in which case it will be 16,
* or the String begins with "0" in which case it will be 8.
*/
public static function parseUnsignedInteger (str :String, radix :uint = 0) :uint
{
var result :Number = parseInt0(str, radix, false);
if (result < 0) {
throw new ArgumentError("parseUnsignedInteger parsed negative value [value=" + str +
"].");
}
if (radix == 0) {
if (startsWith(str, "0x")) {
str = str.substring(2);
radix = 16;
} else if (startsWith(str, "0")) {
str = str.substring(1);
radix = 8;
} else {
radix = 10;
}
} else if (radix == 16 && startsWith(str, "0x")) {
str = str.substring(2);
} else if (radix < 2 || radix > 16) {
throw new ArgumentError("Radix out of range: " + radix);
}
// now verify that str only contains valid chars for the radix
for (var ii :int = 0; ii < str.length; ii++) {
var dex :int = HEX.indexOf(str.charAt(ii).toLowerCase());
if (dex == -1 || dex >= radix) {
throw new ArgumentError("Invalid characters in String parseInt='" + arguments[0] +
"', radix=" + radix);
}
}
var result :Number = parseInt(str, radix);
if (isNaN(result)) {
// this shouldn't happen..
throw new ArgumentError("Could not parseInt=" + arguments[0]);
}
return int(result);
return uint(result);
}
/**
@@ -344,6 +327,60 @@ public class StringUtil
return data;
}
/**
* Internal helper function for parseInteger and parseUnsignedInteger.
*/
protected static function parseInt0 (str :String, radix :uint, allowNegative :Boolean) :Number
{
if (str == null) {
throw new ArgumentError("Cannot parseInt(null)");
}
var negative :Boolean = (str.charAt(0) == "-");
if (negative) {
str = str.substring(1);
}
if (radix == 0) {
if (startsWith(str, "0x")) {
str = str.substring(2);
radix = 16;
} else if (startsWith(str, "0")) {
str = str.substring(1);
radix = 8;
} else {
radix = 10;
}
} else if (radix == 16 && startsWith(str, "0x")) {
str = str.substring(2);
} else if (radix < 2 || radix > 16) {
throw new ArgumentError("Radix out of range: " + radix);
}
// now verify that str only contains valid chars for the radix
for (var ii :int = 0; ii < str.length; ii++) {
var dex :int = HEX.indexOf(str.charAt(ii).toLowerCase());
if (dex == -1 || dex >= radix) {
throw new ArgumentError("Invalid characters in String parseInt='" + arguments[0] +
"', radix=" + radix);
}
}
var result :Number = parseInt(str, radix);
if (isNaN(result)) {
// this shouldn't happen..
throw new ArgumentError("Could not parseInt=" + arguments[0]);
}
if (negative) {
result *= -1;
}
return result;
}
/** Hexidecimal digits. */
protected static const HEX :Array = [ "0", "1", "2", "3", "4",
"5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" ];