391 lines
8.7 KiB
C#
391 lines
8.7 KiB
C#
//
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// System.Web.UI.WebControls.Unit.cs
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//
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// Authors:
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// Miguel de Icaza (miguel@novell.com)
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// Ben Maurer (bmaurer@ximian.com).
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//
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// Copyright (C) 2005 Novell, Inc (http://www.novell.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System.Globalization;
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using System.ComponentModel;
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using System.Security.Permissions;
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using System.Web.Util;
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namespace System.Web.UI.WebControls {
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[TypeConverter(typeof (UnitConverter))]
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[Serializable]
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public struct Unit {
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enum ParsingStage
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{
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Trim,
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SignOrSep,
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DigitOrSep,
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DigitOrUnit,
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Unit
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}
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UnitType type;
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double value;
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bool valueSet;
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public static readonly Unit Empty;
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public Unit (double value, UnitType type)
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{
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if (value < -32768 || value > 32767)
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throw new ArgumentOutOfRangeException ("value");
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this.type = type;
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if (type == UnitType.Pixel)
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this.value = (int) value;
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else
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this.value = value;
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valueSet = true;
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}
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public Unit (double value) : this (value, UnitType.Pixel)
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{
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}
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public Unit (int value) : this ((double) value, UnitType.Pixel)
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{
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}
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internal Unit (string input, char sep)
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{
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if (input == null || input == String.Empty){
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type = (UnitType) 0;
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value = 0.0;
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valueSet = false;
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return;
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}
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value = 0.0;
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double dv = 0, factor = .1;
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int i = 0;
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int count = input.Length;
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int sign = 1, unitStart = -1, unitLen = 0, wsCount = 0;
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char c;
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ParsingStage ps = ParsingStage.Trim;
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bool done = false, haveSep = false, haveDigits = false, isWhiteSpace;
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while (!done && i < count) {
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c = input [i];
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switch (ps) {
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case ParsingStage.Trim:
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if (Char.IsWhiteSpace (c)) {
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i++;
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continue;
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}
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ps = ParsingStage.SignOrSep;
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continue;
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case ParsingStage.SignOrSep:
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wsCount = 0;
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if (c == '-') {
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sign = -1;
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i++;
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ps = ParsingStage.DigitOrSep;
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continue;
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}
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if (c == sep) {
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i++;
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haveSep = true;
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ps = ParsingStage.DigitOrUnit;
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dv = 0;
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continue;
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}
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if (Char.IsDigit (c)) {
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ps = ParsingStage.DigitOrSep;
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continue;
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}
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throw new FormatException ();
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case ParsingStage.DigitOrSep:
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if (Char.IsDigit (c)) {
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dv = dv * 10 + ((int) c) - ((int)'0');
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i++;
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haveDigits = true;
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continue;
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}
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if (c == sep) {
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if (wsCount > 0)
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throw new ArgumentOutOfRangeException ("input");
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i++;
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haveSep = true;
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value = dv * sign;
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dv = 0;
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ps = ParsingStage.DigitOrUnit;
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continue;
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}
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isWhiteSpace = Char.IsWhiteSpace (c);
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if (isWhiteSpace || c == '%' || Char.IsLetter (c)) {
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if (isWhiteSpace) {
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if (!haveDigits)
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throw new ArgumentOutOfRangeException ("input");
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wsCount++;
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i++;
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continue;
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}
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value = dv * sign;
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dv = 0;
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unitStart = i;
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if (haveSep) {
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haveDigits = false;
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ps = ParsingStage.DigitOrUnit;
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} else
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ps = ParsingStage.Unit;
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wsCount = 0;
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continue;
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}
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throw new FormatException ();
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case ParsingStage.DigitOrUnit:
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if (c == '%') {
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unitStart = i;
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unitLen = 1;
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done = true;
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continue;
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}
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isWhiteSpace = Char.IsWhiteSpace (c);
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if (isWhiteSpace || Char.IsLetter (c)) {
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if (isWhiteSpace) {
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wsCount++;
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i++;
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continue;
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}
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ps = ParsingStage.Unit;
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unitStart = i;
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continue;
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}
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if (Char.IsDigit (c)) {
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if (wsCount > 0)
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throw new ArgumentOutOfRangeException ();
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dv = dv + (((int) c) - ((int) '0')) * factor;
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factor = factor *.1;
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i++;
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continue;
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}
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throw new FormatException ();
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case ParsingStage.Unit:
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if (c == '%' || Char.IsLetter (c)) {
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i++;
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unitLen++;
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continue;
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}
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if (unitLen == 0 && Char.IsWhiteSpace (c)) {
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i++;
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unitStart++;
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continue;
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}
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done = true;
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break;
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}
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}
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value += dv * sign;
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if (unitStart >= 0) {
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int unitTail = unitStart + unitLen;
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if (unitTail < count) {
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for (int j = unitTail; j < count; j++) {
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if (!Char.IsWhiteSpace (input [j]))
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throw new ArgumentOutOfRangeException ("input");
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}
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}
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if (unitLen == 1 && input [unitStart] == '%')
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type = UnitType.Percentage;
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else {
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switch (input.Substring (unitStart, unitLen).ToLower (Helpers.InvariantCulture)) {
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case "in": type = UnitType.Inch; break;
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case "cm": type = UnitType.Cm; break;
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case "mm": type = UnitType.Mm; break;
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case "pt": type = UnitType.Point; break;
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case "pc": type = UnitType.Pica; break;
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case "em": type = UnitType.Em; break;
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case "ex": type = UnitType.Ex; break;
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case "px":
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type = UnitType.Pixel;
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break;
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default:
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throw new ArgumentOutOfRangeException ("value");
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}
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}
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} else
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type = UnitType.Pixel;
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if (haveSep && type == UnitType.Pixel)
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throw new FormatException ("Pixel units do not allow floating point values");
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valueSet = true;
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}
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public Unit (string value) : this (value, '.')
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{
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}
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public Unit (string value, CultureInfo culture) : this (value, culture.NumberFormat.NumberDecimalSeparator [0])
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{
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}
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internal Unit (string value, CultureInfo culture, UnitType t) : this (value, '.')
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{
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}
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public bool IsEmpty {
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get {
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return type == 0;
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}
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}
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public UnitType Type {
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get {
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if (type == 0)
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return UnitType.Pixel;
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return type;
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}
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}
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public double Value {
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get {
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return value;
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}
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}
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public static Unit Parse (string s)
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{
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return new Unit (s);
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}
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public static System.Web.UI.WebControls.Unit Parse (string s, System.Globalization.CultureInfo culture)
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{
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return new Unit (s, culture);
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}
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public static Unit Percentage (double n)
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{
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return new Unit (n, UnitType.Percentage);
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}
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public static Unit Pixel (int n)
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{
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return new Unit (n);
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}
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public static Unit Point (int n)
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{
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return new Unit (n, UnitType.Point);
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}
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public override bool Equals (object obj)
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{
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if (obj is Unit){
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Unit other = (Unit) obj;
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return (other.type == type && other.value == value && valueSet == other.valueSet);
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}
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return false;
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}
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public override int GetHashCode ()
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{
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return Type.GetHashCode () ^ Value.GetHashCode ();
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}
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public static bool operator == (Unit left, Unit right)
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{
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return left.Type == right.Type && left.Value == right.Value && left.valueSet == right.valueSet;
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}
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public static bool operator != (Unit left, Unit right)
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{
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return left.Type != right.Type || left.Value != right.Value || left.valueSet != right.valueSet;
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}
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public static implicit operator Unit (int n)
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{
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return new Unit (n);
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}
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internal static string GetExtension (UnitType type)
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{
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switch (type){
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case UnitType.Pixel: return "px";
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case UnitType.Point: return "pt";
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case UnitType.Pica: return "pc";
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case UnitType.Inch: return "in";
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case UnitType.Mm: return "mm";
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case UnitType.Cm: return "cm";
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case UnitType.Percentage: return "%";
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case UnitType.Em: return "em";
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case UnitType.Ex: return "ex";
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default: return String.Empty;
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}
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}
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public string ToString (CultureInfo culture)
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{
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if (type == 0)
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return String.Empty;
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string ex = GetExtension (type);
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return value.ToString (culture) + ex;
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}
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public override string ToString ()
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{
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return ToString (Helpers.InvariantCulture);
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}
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public string ToString (IFormatProvider formatProvider)
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{
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if (type == 0)
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return String.Empty;
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string ex = GetExtension (type);
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return value.ToString (formatProvider) + ex;
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}
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}
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}
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