From 0142fe59202ab4c0c19939511cd71de7c17d3994 Mon Sep 17 00:00:00 2001
From: Zac Medico <zmedico@gentoo.org>
Date: Wed, 5 Mar 2008 19:51:12 +0000
Subject: Handle multi-line quoted variable assignments.

svn path=/main/trunk/; revision=9440
---
 bin/filter-bash-environment.py | 45 ++++++++++++++++++++++++++++++++++--------
 1 file changed, 37 insertions(+), 8 deletions(-)

(limited to 'bin')

diff --git a/bin/filter-bash-environment.py b/bin/filter-bash-environment.py
index 39aa4059f..0db77ba5f 100755
--- a/bin/filter-bash-environment.py
+++ b/bin/filter-bash-environment.py
@@ -15,17 +15,50 @@ here_doc_re = re.compile(r'.*\s<<[-]?(\w+)$')
 func_start_re = re.compile(r'^[-\w]+\s*\(\)\s*$')
 func_end_re = re.compile(r'^\}$')
 
-var_assign_re = re.compile(r'(^|^declare\s+-\S+\s+|^export\s+)([^=\s]+)=.*$')
+var_assign_re = re.compile(r'(^|^declare\s+-\S+\s+|^export\s+)([^=\s]+)=("|\')?.*$')
+close_quote_re = re.compile(r'(\\"|"|\')\s*$')
 
 def compile_egrep_pattern(s):
 	for k, v in egrep_compat_map.iteritems():
 		s = s.replace(k, v)
 	return re.compile(s)
 
+def have_end_quote(quote, line):
+	"""
+	Check if the line has an end quote (useful for handling multi-line
+	quotes). This handles escaped double quotes that may occur at the
+	end of a line. The posix spec does not allow escaping of single
+	quotes inside of single quotes, so that case is not handled.
+	"""
+	close_quote_match = close_quote_re.search(line)
+	return close_quote_match is not None and \
+		close_quote_match.group(0) == quote
+
 def filter_bash_environment(pattern, file_in, file_out):
 	here_doc_delim = None
 	in_func = None
+	multi_line_quote = None
+	multi_line_quote_filter = None
 	for line in file_in:
+		if multi_line_quote is not None:
+			if not multi_line_quote_filter:
+				file_out.write(line)
+			if have_end_quote(multi_line_quote, line):
+				multi_line_quote = None
+				multi_line_quote_filter = None
+			continue
+		if here_doc_delim is None and in_func is None:
+			var_assign_match = var_assign_re.match(line)
+			if var_assign_match is not None:
+				quote = var_assign_match.group(3)
+				filter_this = pattern.match(var_assign_match.group(2)) \
+					is not None
+				if quote is not None and not have_end_quote(quote, line):
+					multi_line_quote = quote
+					multi_line_quote_filter = filter_this
+				if not filter_this:
+					file_out.write(line)
+				continue
 		if here_doc_delim is not None:
 			if here_doc_delim.match(line):
 				here_doc_delim = None
@@ -48,13 +81,9 @@ def filter_bash_environment(pattern, file_in, file_out):
 		if in_func is not None:
 			file_out.write(line)
 			continue
-		var_assign_match = var_assign_re.match(line)
-		if var_assign_match is not None:
-			if pattern.match(var_assign_match.group(2)) is None:
-				file_out.write(line)
-			continue
-		# TODO: properly handle multi-line variable assignments
-		# like those which the 'export' builtin can produce.
+		# This line is not recognized as part of a variable assignment,
+		# function definition, or here document, so just allow it to
+		# pass through.
 		file_out.write(line)
 
 if __name__ == "__main__":
-- 
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