Penlight

• Index

Examples

• seesubst.lua
• sipscan.lua
• symbols.lua
• test-cmp.lua
• test-data.lua
• test-listcallbacks.lua
• test-pretty.lua
• test-symbols.lua
• testapp.lua
• testclone.lua
• testconfig.lua
• testglobal.lua
• testinputfields.lua
• testinputfields2.lua
• testxml.lua
• which.lua

Libraries

• pl
• pl.Set
• pl.app
• pl.array2d
• pl.class
• pl.compat
• pl.comprehension
• pl.config
• pl.data
• pl.dir
• pl.file
• pl.func
• pl.import_into
• pl.input
• pl.lapp
• pl.lexer
• pl.luabalanced
• pl.operator
• pl.path
• pl.permute
• pl.pretty
• pl.seq
• pl.sip
• pl.strict
• pl.stringio
• pl.stringx
• pl.tablex
• pl.template
• pl.test
• pl.text
• pl.types
• pl.url
• pl.utils
• pl.xml

Classes

• pl.Date
• pl.List
• pl.Map
• pl.MultiMap
• pl.OrderedMap

Manual

• Introduction
• Tables and Arrays
• Strings. Higher-level operations on strings.
• Paths and Directories
• Date and Time
• Data
• Functional Programming
• Additional Libraries
• Technical Choices

testglobal.lua

-- very simple lexer program which looks at all identifiers in a Lua
-- file and checks whether they're in the global namespace.
-- At the end, we dump out the result of count_map, which will give us
-- unique identifiers with their usage count.
-- (an example of a program which itself needs to be careful about what
-- goes into the global namespace)

local utils = require 'pl.utils'
local file = require 'pl.file'
local lexer = require 'pl.lexer'
local List = require 'pl.List'
local pretty = require 'pl.pretty'
local seq = require 'pl.seq'
local path = require 'pl.path'

utils.on_error 'quit'

local txt,err = file.read(arg[1] or path.normpath('examples/testglobal.lua'))
local globals = List()
for t,v in lexer.lua(txt) do
	if t == 'iden' and rawget(_G,v) then
		globals:append(v)
	end
end

pretty.dump(seq.count_map(globals))