Factor out PKGBUILD parsing

This is legacy code. Move it to a separate source file in order to clean
up the submission code. The code will be removed altogether in an
upcoming release.

Signed-off-by: Lukas Fleischer <archlinux@cryptocrack.de>

1 files changed, 139 insertions, 0 deletions

diff --git a/web/lib/pkgbuild-parser.inc.php b/web/lib/pkgbuild-parser.inc.php
new file mode 100644
index 0000000..0bd4cfe
--- /dev/null
+++ b/web/lib/pkgbuild-parser.inc.php
@@ -0,0 +1,139 @@
+# <?php
+if (!$error) {
+	# process PKGBUILD - remove line concatenation
+	#
+	$pkgbuild = array();
+	$line_no = 0;
+	$lines = array();
+	$continuation_line = 0;
+	$current_line = "";
+	$paren_depth = 0;
+	foreach (explode("\n", $pkgbuild_raw) as $line) {
+		$line = trim($line);
+		# Remove comments
+		$line = preg_replace('/\s*#.*/', '', $line);
+
+		$char_counts = count_chars($line, 0);
+		$paren_depth += $char_counts[ord('(')] - $char_counts[ord(')')];
+		if (substr($line, strlen($line)-1) == "\\") {
+			# continue appending onto existing line_no
+			#
+			$current_line .= substr($line, 0, strlen($line)-1);
+			$continuation_line = 1;
+		} elseif ($paren_depth > 0) {
+			# assumed continuation
+			# continue appending onto existing line_no
+			#
+			$current_line .= $line . " ";
+			$continuation_line = 1;
+		} else {
+			# maybe the last line in a continuation, or a standalone line?
+			#
+			if ($continuation_line) {
+				# append onto existing line_no
+				#
+				$current_line .= $line;
+				$lines[$line_no] = $current_line;
+				$current_line = "";
+			} else {
+				# it's own line_no
+				#
+				$lines[$line_no] = $line;
+			}
+			$continuation_line = 0;
+			$line_no++;
+		}
+	}
+
+	# Now process the lines and put any var=val lines into the
+	# 'pkgbuild' array.
+	while (list($k, $line) = each($lines)) {
+		# Neutralize parameter substitution
+		$line = preg_replace('/\${(\w+)#(\w*)}?/', '$1$2', $line);
+
+		$lparts = Array();
+		# Match variable assignment only.
+		if (preg_match('/^\s*[_\w]+=[^=].*/', $line, $matches)) {
+			$lparts = explode("=", $matches[0], 2);
+		}
+
+		if (!empty($lparts)) {
+			# this is a variable/value pair, strip
+			# out array parens and any quoting,
+			# except in pkgdesc for pkgname or
+			# pkgdesc, only remove start/end pairs
+			# of " or '
+			if ($lparts[0] == "pkgname" || $lparts[0] == "pkgdesc") {
+				if ($lparts[1]{0} == '"' &&
+						$lparts[1]{strlen($lparts[1])-1} == '"') {
+					$pkgbuild[$lparts[0]] = substr($lparts[1], 1, -1);
+				}
+				elseif
+					($lparts[1]{0} == "'" &&
+					 $lparts[1]{strlen($lparts[1])-1} == "'") {
+					$pkgbuild[$lparts[0]] = substr($lparts[1], 1, -1);
+				} else {
+					$pkgbuild[$lparts[0]] = $lparts[1];
+				}
+			} else {
+				$pkgbuild[$lparts[0]] = str_replace(array("(",")","\"","'"), "",
+						$lparts[1]);
+			}
+		}
+	}
+
+	# some error checking on PKGBUILD contents - just make sure each
+	# variable has a value. This does not do any validity checking
+	# on the values, or attempts to fix line continuation/wrapping.
+	$req_vars = array("url", "pkgdesc", "license", "pkgrel", "pkgver", "arch", "pkgname");
+	foreach ($req_vars as $var) {
+		if (!array_key_exists($var, $pkgbuild)) {
+			$error = __('Missing %s variable in PKGBUILD.', $var);
+			break;
+		}
+	}
+}
+
+# Now, run through the pkgbuild array, and do "eval" and simple substituions.
+$new_pkgbuild = array();
+if (!$error) {
+	while (list($k, $v) = each($pkgbuild)) {
+		if (strpos($k,'eval ') !== false) {
+			$k = preg_replace('/^eval[\s]*/', "", $k);
+			##"eval" replacements
+			$pattern_eval = '/{\$({?)([\w]+)(}?)}/';
+			while (preg_match($pattern_eval,$v,$regs)) {
+				$pieces = explode(",",$pkgbuild["$regs[2]"]);
+				## nongreedy matching! - preserving the order of "eval"
+				$pattern = '/([\S]*?){\$'.$regs[1].$regs[2].$regs[3].'}([\S]*)/';
+				while (preg_match($pattern,$v,$regs_replace)) {
+					$replacement = "";
+					for ($i = 0; $i < sizeof($pieces); $i++) {
+						$replacement .= $regs_replace[1].$pieces[$i].$regs_replace[2]." ";
+					}
+					$v=preg_replace($pattern, $replacement, $v, 1);
+				}
+			}
+		}
+
+		# Simple variable replacement
+		$pattern_var = '/\$({?)([_\w]+)(}?)/';
+		$offset = 0;
+		while (preg_match($pattern_var, $v, $regs, PREG_OFFSET_CAPTURE, $offset)) {
+			$var = $regs[2][0];
+			$pos = $regs[0][1];
+			$len = strlen($regs[0][0]);
+
+			if (isset($new_pkgbuild[$var])) {
+				$replacement = substr($new_pkgbuild[$var], strpos($new_pkgbuild[$var], " "));
+			}
+			else {
+				$replacement = '';
+			}
+
+			$v = substr_replace($v, $replacement, $pos, $len);
+			$offset = $pos + strlen($replacement);
+		}
+		$new_pkgbuild[$k] = $v;
+	}
+}