Added parser library. Display filecontent descr in filedetails.

git-svn-id: svn://svn.alpinelinux.org/acf/core/trunk@1474 ab2d0c66-481e-0410-8bed-d214d4d58bed

2 files changed, 80 insertions, 0 deletions

diff --git a/lib/Makefile b/lib/Makefile
index 23a1a31..eb5c0fd 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -24,6 +24,7 @@ LIB_DIST=fs.lua\
 	modelfunctions.lua\
 	cfe.lua\
 	apk.lua\
+	parser.lua\
 
 EXTRA_DIST=README Makefile
 DISTFILES=$(LIB_DIST) $(EXTRA_DIST)
diff --git a/lib/parser.lua b/lib/parser.lua
new file mode 100644
index 0000000..7c6af67
--- /dev/null
+++ b/lib/parser.lua
@@ -0,0 +1,79 @@
+module(..., package.seeall)
+
+function parseconfigfile(file)
+	file = file or ""
+	local retval = {commented={}}
+	local linenum=0
+	for line in string.gmatch(file, "([^\n]*)\n?") do
+		linenum=linenum+1
+		if not string.match(line, "^[%s#]*$") then
+			local linetable = {linenum=linenum, line=line}
+			if string.match(line, "^%s*#") then
+				table.insert(retval.commented, linetable)
+				line = string.match(line, "^%s*#(.*)")
+			else
+				table.insert(retval, linetable)
+			end
+			-- Iterate through each word, being careful about quoted strings and comments
+			local offset = 1
+			while string.find(line, "%S+", offset) do
+				local word = string.match(line, "%S+", offset)
+				local endword = select(2, string.find(line, "%S+", offset))
+				if string.find(word, "^#") then
+					break
+				elseif string.find(word, "^\"") then
+					endword = select(2, string.find(line, "\"[^\"]*\"", offset))
+					word = string.sub(line, string.find(line, "\"", offset), endword)
+				end
+				table.insert(linetable, word)
+				offset = endword + 1
+			end
+		end
+	end
+	return retval
+end
+
+-- Removes the linenum line from file and replaces it with line.
+-- Do nothing if doesn't exist
+function replaceline(file, linenum, line)
+	-- Split the file to remove the line
+	local startchar, endchar = string.match(file, "^" .. string.rep("[^\n]*\n", linenum-1) .. "()[^\n]*\n?()")
+	if startchar and endchar then
+		local lines = {}
+		lines[1] = string.sub(file, 1, startchar-1)
+		lines[2] = string.sub(file, endchar, -1)
+		if line then
+			table.insert(lines, 2, line .. "\n")
+		end
+		file = table.concat(lines)
+	end
+	return file
+end
+
+-- Inserts the line into the file after the linenum (or at the end)
+function insertline(file, linenum, line)
+	-- Split the file to remove the line
+	local startchar = string.match(file, "^" .. string.rep("[^\n]*\n", linenum) .. "()")
+	local lines = {}
+	if startchar then
+		lines[1] = string.sub(file, 1, startchar-1)
+		lines[2] = string.sub(file, startchar, -1)
+	else
+		lines[1] = file
+	end
+	if line then
+		table.insert(lines, 2, line .. "\n")
+	end
+	file = table.concat(lines)
+	return file
+end
+
+function getline(file, linenum)
+	-- Split the file to remove the line
+	local startchar, endchar = string.match(file, "^" .. string.rep("[^\n]*\n", linenum-1) .. "()[^\n]*()")
+	local line
+	if startchar and endchar then
+		line = string.sub(file, startchar, endchar-1)
+	end
+	return line
+end