+ Penlight

1 files changed, 83 insertions, 0 deletions

diff --git a/Data/Libraries/Penlight/examples/testxml.lua b/Data/Libraries/Penlight/examples/testxml.lua
new file mode 100644
index 0000000..2528020
--- /dev/null
+++ b/Data/Libraries/Penlight/examples/testxml.lua
@@ -0,0 +1,83 @@
+-- an example showing 'pl.lexer' doing some serious work.
+-- The resulting Lua table is in the same LOM format used by luaexpat.
+-- This is (clearly) not a professional XML parser, so don't use it
+-- on your homework!
+
+local lexer = require 'pl.lexer'
+local pretty = require 'pl.pretty'
+
+local append = table.insert
+local skipws,expecting = lexer.skipws,lexer.expecting
+
+local function parse_element (tok,tag)
+	local tbl,t,v,attrib
+	tbl = {}
+	tbl.tag = tag  -- LOM 'tag' is the element tag
+	t,v = skipws(tok)
+	while v ~= '/' and v ~= '>' do
+		if t ~= 'iden' then error('expecting attribute identifier') end
+		attrib = v
+		expecting(tok,'=')
+		v = expecting(tok,'string')
+		-- LOM: 'attr' subtable contains attrib/value pairs and an ordered list of attribs
+		if not tbl.attr then tbl.attr = {} end
+		tbl.attr[attrib] = v
+		append(tbl.attr,attrib)
+		t,v = skipws(tok)
+	end
+	if v == '/' then
+		expecting(tok,'>')
+		return tbl
+	end
+	-- pick up element data
+	t,v = tok()
+	while true do
+		if t == '<' then
+			t,v = skipws(tok)
+			if t == '/' then -- element end tag
+				t,v = tok()
+				if t == '>' then return tbl end
+				if t == 'iden' and v == tag then
+					if tok() == '>' then return tbl end
+				end
+				error('expecting end tag '..tag)
+			else
+				append(tbl,parse_element(tok,v)) -- LOM: child elements added to table
+				t,v = skipws(tok)
+			end
+		else
+			append(tbl,v) -- LOM: text added to table
+			t,v = skipws(tok)
+		end
+	end
+end
+
+local function parse_xml (tok)
+	local t = skipws(tok)
+	local v
+	while t == '<' do
+		t,v = tok()
+		if t == '?' or t == '!' then
+			-- skip meta stuff and commentary
+			repeat t = tok() until t == '>'
+			t = expecting(tok,'<')
+		else
+			return parse_element(tok,v)
+		end
+	end
+end
+
+local s = [[
+<?xml version="1.0" encoding="UTF-8"?>
+<sensor name="closure-meter-2" id="7D7D0600006F0D00" loc="100,100,0" device="closure-meter" init="true">
+<detector name="closure-meter" phenomenon="closure" units="mm" id="1"
+    vmin="0" vmax="5000" device="closure-meter" calib="0,0;5000,5000"
+    sampling_interval="25000" measurement_interval="600000"
+/>
+</sensor>
+]]
+
+local tok = lexer.scan(s,nil,{space=false},{string=true})
+local res = parse_xml(tok)
+print(pretty.write(res))
+