Added ability to change relative paths according to path to root .less file. (#119)

README.md

@@ -94,3 +94,9 @@ output run this:
 
 For more help, run `plessc --help`
 
+### This fork ([nodge/lessphp][5])
+
+The only change in this fork is the ability to change relative paths according to path to root .less file. (Fixes [#119][6]).
+
+ [5]: https://github.com/Nodge/lessphp/
+ [6]: https://github.com/leafo/lessphp/issues/119

composer.json

@@ -1,5 +1,5 @@
 {
-    "name": "leafo/lessphp",
+    "name": "nodge/lessphp",
     "type": "library",
     "description": "lessphp is a compiler for LESS written in PHP.",
     "homepage": "http://leafo.net/lessphp/",

lessc.inc.php

@@ -54,6 +54,9 @@ class lessc {
 	public $importDisabled = false;
 	public $importDir = '';
 
+	public $allowUrlRewrite = false; // rewrite urls relative to imported files
+	public $baseUrlPath = null;
+
 	protected $numberPrecision = null;
 
 	protected $allParsedFiles = array();
@@ -118,7 +121,6 @@ protected function tryImport($importPath, $parentBlock, $out) {
 		$this->addParsedFile($realPath);
 		$parser = $this->makeParser($realPath);
 		$root = $parser->parse(file_get_contents($realPath));
-
 		// set the parents of all the block props
 		foreach ($root->props as $prop) {
 			if ($prop[0] == "block") {
@@ -807,7 +809,6 @@ protected function compileProp($prop, $block, $out) {
 		}
 	}
 
-
 	/**
 	 * Compiles a primitive value into a CSS property value.
 	 *
@@ -819,12 +820,16 @@ protected function compileProp($prop, $block, $out) {
 	 * The input is expected to be reduced. This function will not work on
 	 * things like expressions and variables.
 	 */
-	protected function compileValue($value) {
+	protected function compileValue($value, $inUrl = false) {
 		switch ($value[0]) {
 		case 'list':
 			// [1] - delimiter
 			// [2] - array of values
-			return implode($value[1], array_map(array($this, 'compileValue'), $value[2]));
+			$values = array();
+			foreach ($value[2] as $item) {
+				$values[] = $this->compileValue($item, $inUrl);
+			}
+			return implode($value[1], $values);
 		case 'raw_color':
 			if (!empty($this->formatter->compressColors)) {
 				return $this->compileValue($this->coerceColor($value));
@@ -846,10 +851,14 @@ protected function compileValue($value) {
 			list(, $delim, $content) = $value;
 			foreach ($content as &$part) {
 				if (is_array($part)) {
-					$part = $this->compileValue($part);
+					$part = $this->compileValue($part, false);
 				}
 			}
-			return $delim . implode($content) . $delim;
+			$content = implode($content);
+			if ($inUrl && $this->allowUrlRewrite) {
+				$content = $this->rewriteUrls($content);
+			}
+			return $delim . $content . $delim;
 		case 'color':
 			// [1] - red component (either number or a %)
 			// [2] - green component
@@ -877,12 +886,47 @@ protected function compileValue($value) {
 
 		case 'function':
 			list(, $name, $args) = $value;
-			return $name.'('.$this->compileValue($args).')';
+			return $name.'('.$this->compileValue($args, $name === 'url').')';
 		default: // assumed to be unit
 			$this->throwError("unknown value type: $value[0]");
 		}
 	}
 
+	/**
+	 * Change relative paths according to path to root .less file.
+	 */
+	protected function rewriteUrls($url) {
+		$baseImportDir = realpath(isset($this->baseUrlPath) ? $this->baseUrlPath : end($this->importDir));
+		$lastImportDir = realpath(reset($this->importDir));
+
+		if ($baseImportDir === $lastImportDir)
+			return $url;
+
+		$arguments = null;
+		if(strpos($url,'?') !== false)
+			list($url, $arguments) = explode('?', $url);
+
+		$urlPath = realpath($lastImportDir.DIRECTORY_SEPARATOR.$url);
+		if ($urlPath === false)
+			return $arguments ? $url.'?'.$arguments : $url;
+
+		$baseArray = explode(DIRECTORY_SEPARATOR, $baseImportDir);
+		$urlArray = explode(DIRECTORY_SEPARATOR, $urlPath);
+
+		$i = 0;
+		foreach ($baseArray as $i => $segment) {
+			if (!isset($baseArray[$i], $urlArray[$i]) || $baseArray[$i] !== $urlArray[$i])
+				break;
+			else
+				$i++; // if the above condition is not satisfied, `i` must be equal to count($baseArray)
+		}
+
+		$newUrl = str_repeat('../', count($baseArray) - $i);
+		$newUrl .= implode('/', array_slice($urlArray, $i));
+
+		return $arguments ? $newUrl.'?'.$arguments : $newUrl;
+	}
+
 	protected function lib_pow($args) {
 		list($base, $exp) = $this->assertArgs($args, 2, "pow");
 		return pow($this->assertNumber($base), $this->assertNumber($exp));
@@ -2047,6 +2091,10 @@ public function addImportDir($dir) {
 		$this->importDir[] = $dir;
 	}
 
+	public function setAllowUrlRewrite($allowUrlRewrite){
+		$this->allowUrlRewrite = (bool)$allowUrlRewrite;
+	}
+
 	public function allParsedFiles() {
 		return $this->allParsedFiles;
 	}