From 2497fd9e7a0fae5ee4887890d7a312e0e08a93b8 Mon Sep 17 00:00:00 2001
From: Determinant <ted.sybil@gmail.com>
Date: Mon, 22 Jun 2015 19:01:29 +0800
Subject: major change: use luarocks to manage project

---
 pl/utils.lua | 476 -----------------------------------------------------------
 1 file changed, 476 deletions(-)
 delete mode 100644 pl/utils.lua

(limited to 'pl/utils.lua')

diff --git a/pl/utils.lua b/pl/utils.lua
deleted file mode 100644
index f933afb..0000000
--- a/pl/utils.lua
+++ /dev/null
@@ -1,476 +0,0 @@
---- Generally useful routines.
--- See  @{01-introduction.md.Generally_useful_functions|the Guide}.
--- @module pl.utils
-local format,gsub,byte = string.format,string.gsub,string.byte
-local compat = require 'pl.compat'
-local clock = os.clock
-local stdout = io.stdout
-local append = table.insert
-local unpack = rawget(_G,'unpack') or rawget(table,'unpack')
-
-local collisions = {}
-
-local utils = {
-    _VERSION = "1.3.2",
-    lua51 = compat.lua51,
-    setfenv = compat.setfenv,
-    getfenv = compat.getfenv,
-    load = compat.load,
-    execute = compat.execute,
-    dir_separator = _G.package.config:sub(1,1),
-    unpack = unpack
-}
-
---- end this program gracefully.
--- @param code The exit code or a message to be printed
--- @param ... extra arguments for message's format'
--- @see utils.fprintf
-function utils.quit(code,...)
-    if type(code) == 'string' then
-        utils.fprintf(io.stderr,code,...)
-        code = -1
-    else
-        utils.fprintf(io.stderr,...)
-    end
-    io.stderr:write('\n')
-    os.exit(code)
-end
-
---- print an arbitrary number of arguments using a format.
--- @param fmt The format (see string.format)
--- @param ... Extra arguments for format
-function utils.printf(fmt,...)
-    utils.assert_string(1,fmt)
-    utils.fprintf(stdout,fmt,...)
-end
-
---- write an arbitrary number of arguments to a file using a format.
--- @param f File handle to write to.
--- @param fmt The format (see string.format).
--- @param ... Extra arguments for format
-function utils.fprintf(f,fmt,...)
-    utils.assert_string(2,fmt)
-    f:write(format(fmt,...))
-end
-
-local function import_symbol(T,k,v,libname)
-    local key = rawget(T,k)
-    -- warn about collisions!
-    if key and k ~= '_M' and k ~= '_NAME' and k ~= '_PACKAGE' and k ~= '_VERSION' then
-        utils.printf("warning: '%s.%s' will not override existing symbol\n",libname,k)
-        return
-    end
-    rawset(T,k,v)
-end
-
-local function lookup_lib(T,t)
-    for k,v in pairs(T) do
-        if v == t then return k end
-    end
-    return '?'
-end
-
-local already_imported = {}
-
---- take a table and 'inject' it into the local namespace.
--- @param t The Table
--- @param T An optional destination table (defaults to callers environment)
-function utils.import(t,T)
-    T = T or _G
-    t = t or utils
-    if type(t) == 'string' then
-        t = require (t)
-    end
-    local libname = lookup_lib(T,t)
-    if already_imported[t] then return end
-    already_imported[t] = libname
-    for k,v in pairs(t) do
-        import_symbol(T,k,v,libname)
-    end
-end
-
-utils.patterns = {
-    FLOAT = '[%+%-%d]%d*%.?%d*[eE]?[%+%-]?%d*',
-    INTEGER = '[+%-%d]%d*',
-    IDEN = '[%a_][%w_]*',
-    FILE = '[%a%.\\][:%][%w%._%-\\]*'
-}
-
---- escape any 'magic' characters in a string
--- @param s The input string
-function utils.escape(s)
-    utils.assert_string(1,s)
-    return (s:gsub('[%-%.%+%[%]%(%)%$%^%%%?%*]','%%%1'))
-end
-
---- return either of two values, depending on a condition.
--- @param cond A condition
--- @param value1 Value returned if cond is true
--- @param value2 Value returned if cond is false (can be optional)
-function utils.choose(cond,value1,value2)
-    if cond then return value1
-    else return value2
-    end
-end
-
-local raise
-
---- return the contents of a file as a string
--- @param filename The file path
--- @param is_bin open in binary mode
--- @return file contents
-function utils.readfile(filename,is_bin)
-    local mode = is_bin and 'b' or ''
-    utils.assert_string(1,filename)
-    local f,err = io.open(filename,'r'..mode)
-    if not f then return utils.raise (err) end
-    local res,err = f:read('*a')
-    f:close()
-    if not res then return raise (err) end
-    return res
-end
-
---- write a string to a file
--- @param filename The file path
--- @param str The string
--- @return true or nil
--- @return error message
--- @raise error if filename or str aren't strings
-function utils.writefile(filename,str)
-    utils.assert_string(1,filename)
-    utils.assert_string(2,str)
-    local f,err = io.open(filename,'w')
-    if not f then return raise(err) end
-    f:write(str)
-    f:close()
-    return true
-end
-
---- return the contents of a file as a list of lines
--- @param filename The file path
--- @return file contents as a table
--- @raise errror if filename is not a string
-function utils.readlines(filename)
-    utils.assert_string(1,filename)
-    local f,err = io.open(filename,'r')
-    if not f then return raise(err) end
-    local res = {}
-    for line in f:lines() do
-        append(res,line)
-    end
-    f:close()
-    return res
-end
-
---- split a string into a list of strings separated by a delimiter.
--- @param s The input string
--- @param re A Lua string pattern; defaults to '%s+'
--- @param plain don't use Lua patterns
--- @param n optional maximum number of splits
--- @return a list-like table
--- @raise error if s is not a string
-function utils.split(s,re,plain,n)
-    utils.assert_string(1,s)
-    local find,sub,append = string.find, string.sub, table.insert
-    local i1,ls = 1,{}
-    if not re then re = '%s+' end
-    if re == '' then return {s} end
-    while true do
-        local i2,i3 = find(s,re,i1,plain)
-        if not i2 then
-            local last = sub(s,i1)
-            if last ~= '' then append(ls,last) end
-            if #ls == 1 and ls[1] == '' then
-                return {}
-            else
-                return ls
-            end
-        end
-        append(ls,sub(s,i1,i2-1))
-        if n and #ls == n then
-            ls[#ls] = sub(s,i1)
-            return ls
-        end
-        i1 = i3+1
-    end
-end
-
---- split a string into a number of values.
--- @param s the string
--- @param re the delimiter, default space
--- @return n values
--- @usage first,next = splitv('jane:doe',':')
--- @see split
-function utils.splitv (s,re)
-    return unpack(utils.split(s,re))
-end
-
---- convert an array of values to strings.
--- @param t a list-like table
--- @param temp buffer to use, otherwise allocate
--- @param tostr custom tostring function, called with (value,index).
--- Otherwise use `tostring`
--- @return the converted buffer
-function utils.array_tostring (t,temp,tostr)
-    temp, tostr = temp or {}, tostr or tostring
-    for i = 1,#t do
-        temp[i] = tostr(t[i],i)
-    end
-    return temp
-end
-
---- execute a shell command and return the output.
--- This function redirects the output to tempfiles and returns the content of those files.
--- @param cmd a shell command
--- @param bin boolean, if true, read output as binary file
--- @return true if successful
--- @return actual return code
--- @return stdout output (string)
--- @return errout output (string)
-function utils.executeex(cmd, bin)
-    local mode
-    local outfile = os.tmpname()
-    local errfile = os.tmpname()
-
-    if utils.dir_separator == '\\' then
-        outfile = os.getenv('TEMP')..outfile
-        errfile = os.getenv('TEMP')..errfile
-    end
-    cmd = cmd .. [[ >"]]..outfile..[[" 2>"]]..errfile..[["]]
-
-    local success, retcode = utils.execute(cmd)
-    local outcontent = utils.readfile(outfile, bin)
-    local errcontent = utils.readfile(errfile, bin)
-    os.remove(outfile)
-    os.remove(errfile)
-    return success, retcode, (outcontent or ""), (errcontent or "")
-end
-
---- 'memoize' a function (cache returned value for next call).
--- This is useful if you have a function which is relatively expensive,
--- but you don't know in advance what values will be required, so
--- building a table upfront is wasteful/impossible.
--- @param func a function of at least one argument
--- @return a function with at least one argument, which is used as the key.
-function utils.memoize(func)
-    return setmetatable({}, {
-        __index = function(self, k, ...)
-            local v = func(k,...)
-            self[k] = v
-            return v
-        end,
-        __call = function(self, k) return self[k] end
-    })
-end
-
-
-utils.stdmt = {
-    List = {_name='List'}, Map = {_name='Map'},
-    Set = {_name='Set'}, MultiMap = {_name='MultiMap'}
-}
-
-local _function_factories = {}
-
---- associate a function factory with a type.
--- A function factory takes an object of the given type and
--- returns a function for evaluating it
--- @tab mt metatable
--- @func fun a callable that returns a function
-function utils.add_function_factory (mt,fun)
-    _function_factories[mt] = fun
-end
-
-local function _string_lambda(f)
-    local raise = utils.raise
-    if f:find '^|' or f:find '_' then
-        local args,body = f:match '|([^|]*)|(.+)'
-        if f:find '_' then
-            args = '_'
-            body = f
-        else
-            if not args then return raise 'bad string lambda' end
-        end
-        local fstr = 'return function('..args..') return '..body..' end'
-        local fn,err = utils.load(fstr)
-        if not fn then return raise(err) end
-        fn = fn()
-        return fn
-    else return raise 'not a string lambda'
-    end
-end
-
---- an anonymous function as a string. This string is either of the form
--- '|args| expression' or is a function of one argument, '_'
--- @param lf function as a string
--- @return a function
--- @usage string_lambda '|x|x+1' (2) == 3
--- @usage string_lambda '_+1 (2) == 3
--- @function utils.string_lambda
-utils.string_lambda = utils.memoize(_string_lambda)
-
-local ops
-
---- process a function argument.
--- This is used throughout Penlight and defines what is meant by a function:
--- Something that is callable, or an operator string as defined by <code>pl.operator</code>,
--- such as '>' or '#'. If a function factory has been registered for the type, it will
--- be called to get the function.
--- @param idx argument index
--- @param f a function, operator string, or callable object
--- @param msg optional error message
--- @return a callable
--- @raise if idx is not a number or if f is not callable
-function utils.function_arg (idx,f,msg)
-    utils.assert_arg(1,idx,'number')
-    local tp = type(f)
-    if tp == 'function' then return f end  -- no worries!
-    -- ok, a string can correspond to an operator (like '==')
-    if tp == 'string' then
-        if not ops then ops = require 'pl.operator'.optable end
-        local fn = ops[f]
-        if fn then return fn end
-        local fn, err = utils.string_lambda(f)
-        if not fn then error(err..': '..f) end
-        return fn
-    elseif tp == 'table' or tp == 'userdata' then
-        local mt = getmetatable(f)
-        if not mt then error('not a callable object',2) end
-        local ff = _function_factories[mt]
-        if not ff then
-            if not mt.__call then error('not a callable object',2) end
-            return f
-        else
-            return ff(f) -- we have a function factory for this type!
-        end
-    end
-    if not msg then msg = " must be callable" end
-    if idx > 0 then
-        error("argument "..idx..": "..msg,2)
-    else
-        error(msg,2)
-    end
-end
-
---- bind the first argument of the function to a value.
--- @param fn a function of at least two values (may be an operator string)
--- @param p a value
--- @return a function such that f(x) is fn(p,x)
--- @raise same as @{function_arg}
--- @see func.bind1
-function utils.bind1 (fn,p)
-    fn = utils.function_arg(1,fn)
-    return function(...) return fn(p,...) end
-end
-
---- bind the second argument of the function to a value.
--- @param fn a function of at least two values (may be an operator string)
--- @param p a value
--- @return a function such that f(x) is fn(x,p)
--- @raise same as @{function_arg}
-function utils.bind2 (fn,p)
-    fn = utils.function_arg(1,fn)
-    return function(x,...) return fn(x,p,...) end
-end
-
-
---- assert that the given argument is in fact of the correct type.
--- @param n argument index
--- @param val the value
--- @param tp the type
--- @param verify an optional verfication function
--- @param msg an optional custom message
--- @param lev optional stack position for trace, default 2
--- @raise if the argument n is not the correct type
--- @usage assert_arg(1,t,'table')
--- @usage assert_arg(n,val,'string',path.isdir,'not a directory')
-function utils.assert_arg (n,val,tp,verify,msg,lev)
-    if type(val) ~= tp then
-        error(("argument %d expected a '%s', got a '%s'"):format(n,tp,type(val)),lev or 2)
-    end
-    if verify and not verify(val) then
-        error(("argument %d: '%s' %s"):format(n,val,msg),lev or 2)
-    end
-end
-
---- assert the common case that the argument is a string.
--- @param n argument index
--- @param val a value that must be a string
--- @raise val must be a string
-function utils.assert_string (n,val)
-    utils.assert_arg(n,val,'string',nil,nil,3)
-end
-
-local err_mode = 'default'
-
---- control the error strategy used by Penlight.
--- Controls how <code>utils.raise</code> works; the default is for it
--- to return nil and the error string, but if the mode is 'error' then
--- it will throw an error. If mode is 'quit' it will immediately terminate
--- the program.
--- @param mode - either 'default', 'quit'  or 'error'
--- @see utils.raise
-function utils.on_error (mode)
-    if ({['default'] = 1, ['quit'] = 2, ['error'] = 3})[mode] then
-      err_mode = mode
-    else
-      -- fail loudly
-      if err_mode == 'default' then err_mode = 'error' end
-      utils.raise("Bad argument expected string; 'default', 'quit', or 'error'. Got '"..tostring(mode).."'")
-    end
-end
-
---- used by Penlight functions to return errors.  Its global behaviour is controlled
--- by <code>utils.on_error</code>
--- @param err the error string.
--- @see utils.on_error
-function utils.raise (err)
-    if err_mode == 'default' then return nil,err
-    elseif err_mode == 'quit' then utils.quit(err)
-    else error(err,2)
-    end
-end
-
---- is the object of the specified type?.
--- If the type is a string, then use type, otherwise compare with metatable
--- @param obj An object to check
--- @param tp String of what type it should be
-function utils.is_type (obj,tp)
-    if type(tp) == 'string' then return type(obj) == tp end
-    local mt = getmetatable(obj)
-    return tp == mt
-end
-
-raise = utils.raise
-
---- load a code string or bytecode chunk.
--- @param code Lua code as a string or bytecode
--- @param name for source errors
--- @param mode kind of chunk, 't' for text, 'b' for bytecode, 'bt' for all (default)
--- @param env  the environment for the new chunk (default nil)
--- @return compiled chunk
--- @return error message (chunk is nil)
--- @function utils.load
-
----------------
--- Get environment of a function.
--- With Lua 5.2, may return nil for a function with no global references!
--- Based on code by [Sergey Rozhenko](http://lua-users.org/lists/lua-l/2010-06/msg00313.html)
--- @param f a function or a call stack reference
--- @function utils.getfenv
-
----------------
--- Set environment of a function
--- @param f a function or a call stack reference
--- @param env a table that becomes the new environment of `f`
--- @function utils.setfenv
-
---- execute a shell command.
--- This is a compatibility function that returns the same for Lua 5.1 and Lua 5.2
--- @param cmd a shell command
--- @return true if successful
--- @return actual return code
--- @function utils.execute
-
-return utils
-
-
-- 
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