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-rw-r--r--lib/webcolor.php191
1 files changed, 191 insertions, 0 deletions
diff --git a/lib/webcolor.php b/lib/webcolor.php
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+++ b/lib/webcolor.php
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+<?php
+/**
+ * Laconica, the distributed open-source microblogging tool
+ *
+ * Base class for deleting things
+ *
+ * PHP version 5
+ *
+ * LICENCE: This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @category Personal
+ * @package Laconica
+ * @author Zach Copley <zach@controlyourself.ca>
+ * @copyright 2009 Control Yourself, Inc.
+ * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
+ * @link http://laconi.ca/
+ */
+
+if (!defined('LACONICA')) {
+ exit(1);
+}
+
+class WebColor {
+
+ // XXX: Maybe make getters and setters for r,g,b values and tuples,
+ // e.g.: to support this kinda CSS representation: rgb(255,0,0)
+ // http://www.w3.org/TR/CSS21/syndata.html#color-units
+
+ var $red = 0;
+ var $green = 0;
+ var $blue = 0;
+
+ /**
+ * Constructor
+ *
+ * @return nothing
+ */
+
+ function __construct($color = null)
+ {
+ if (isset($color)) {
+ $this->parseColor($color);
+ }
+ }
+
+ /**
+ * Parses input to and tries to determine whether the color
+ * is being specified via an integer or hex tuple and sets
+ * the RGB instance variables accordingly.
+ *
+ * XXX: Maybe support (r,g,b) style, and array?
+ *
+ * @param mixed $color
+ *
+ * @return nothing
+ */
+
+ function parseColor($color) {
+
+ if (is_numeric($color)) {
+ $this->setIntColor($color);
+ } else {
+
+ // XXX named colors
+
+ // XXX: probably should do even more validation
+
+ if (preg_match('/(#([0-9A-Fa-f]{3,6})\b)/u', $color) > 0) {
+ $this->setHexColor($color);
+ } else {
+ $errmsg = _('%s is not a valid color!');
+ throw new WebColorException(sprintf($errmsg, $color));
+ }
+ }
+ }
+
+ /**
+ * @param string $name
+ *
+ * @return nothing
+ */
+
+ function setNamedColor($name)
+ {
+ // XXX Implement this
+ }
+
+
+ /**
+ * Sets the RGB color values from a a hex tuple
+ *
+ * @param string $hexcolor
+ *
+ * @return nothing
+ */
+
+ function setHexColor($hexcolor) {
+
+ if ($hexcolor[0] == '#') {
+ $hexcolor = substr($hexcolor, 1);
+ }
+
+ if (strlen($hexcolor) == 6) {
+ list($r, $g, $b) = array($hexcolor[0].$hexcolor[1],
+ $hexcolor[2].$hexcolor[3],
+ $hexcolor[4].$hexcolor[5]);
+ } elseif (strlen($hexcolor) == 3) {
+ list($r, $g, $b) = array($hexcolor[0].$hexcolor[0],
+ $hexcolor[1].$hexcolor[1],
+ $hexcolor[2].$hexcolor[2]);
+ } else {
+ return false;
+ }
+
+ $this->red = hexdec($r);
+ $this->green = hexdec($g);
+ $this->blue = hexdec($b);
+
+ }
+
+ /**
+ * Sets the RGB color values from a 24-bit integer
+ *
+ * @param int $intcolor
+ *
+ * @return nothing
+ */
+
+ function setIntColor($intcolor)
+ {
+ // We could do 32 bit and have an alpha channel because
+ // Sarven wants one real bad, but nah.
+
+ $this->red = $intcolor >> 16;
+ $this->green = $intcolor >> 8 & 0xFF;
+ $this->blue = $intcolor & 0xFF;
+
+ }
+
+ /**
+ * Returns a hex tuple of the RGB color useful for output in HTML
+ *
+ * @return string
+ */
+
+ function hexValue() {
+
+ $hexcolor = (strlen(dechex($this->red)) < 2 ? '0' : '' ) .
+ dechex($this->red);
+ $hexcolor .= (strlen(dechex($this->green)) < 2 ? '0' : '') .
+ dechex($this->green);
+ $hexcolor .= (strlen(dechex($this->blue)) < 2 ? '0' : '') .
+ dechex($this->blue);
+
+ return $hexcolor;
+
+ }
+
+ /**
+ * Returns a 24-bit packed integer representation of the RGB color
+ * for convenient storage in the DB
+ *
+ * XXX: probably could just use hexdec() instead
+ *
+ * @return int
+ */
+
+ function intValue()
+ {
+ $intcolor = 256 * 256 * $this->red + 256 * $this->green + $this->blue;
+ return $intcolor;
+ }
+
+}
+
+class WebColorException extends Exception
+{
+}
+
+?> \ No newline at end of file