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-- 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 = 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))
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