lunarmodules / Penlight / 478

Committed 12 Feb 2024 09:01AM UTC coverage: 89.675% (+0.7%) from 88.938%

Build # 478

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appveyor

Committed by

Tieske

Commit Message

fix(docs): proper escape back-slash

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97.06

/lua/pl/config.lua

--- Reads configuration files into a Lua table.
--  Understands INI files, classic Unix config files, and simple
-- delimited columns of values. See @{06-data.md.Reading_Configuration_Files|the Guide}
--
--    # test.config
--    # Read timeout in seconds
--    read.timeout=10
--    # Write timeout in seconds
--    write.timeout=5
--    #acceptable ports
--    ports = 1002,1003,1004
--
--    -- readconfig.lua
--    local config = require 'config'
--    local t = config.read 'test.config'
--    print(pretty.write(t))
--
--    ### output #####
--    {
--      ports = {
--        1002,
--        1003,
--        1004
--      },
--      write_timeout = 5,
--      read_timeout = 10
--    }
--
-- @module pl.config

local type,tonumber,ipairs,io, table = _G.type,_G.tonumber,_G.ipairs,_G.io,_G.table

local function split(s,re)
    local res = {}
    local t_insert = table.insert
    re = '[^'..re..']+'
    for k in s:gmatch(re) do t_insert(res,k) end
    return res
end

local function strip(s)
    return s:gsub('^%s+',''):gsub('%s+$','')
end

local function strip_quotes (s)
    return s:gsub("['\"](.*)['\"]",'%1')
end

local config = {}

--- like `io.lines`, but allows for lines to be continued with '`\\`'.
-- @param file a file-like object (anything where read() returns the next line) or a filename.
-- Defaults to standard input.
-- @return an iterator over the lines, or nil
-- @return error 'not a file-like object' or 'file is nil'
function config.lines(file)
    local f,openf,err
    local line = ''
    if type(file) == 'string' then
        f,err = io.open(file,'r')
        if not f then return nil,err end
        openf = true
    else
        f = file or io.stdin
        if not file.read then return nil, 'not a file-like object' end
    end
    if not f then return nil, 'file is nil' end
    return function()
        local l = f:read()
        while l do
            -- only for non-blank lines that don't begin with either ';' or '#'
            if l:match '%S' and not l:match '^%s*[;#]' then
                -- does the line end with '\'?
                local i = l:find '\\%s*$'
                if i then -- if so,
                    line = line..l:sub(1,i-1)
                elseif line == '' then
                    return l
                else
                    l = line..l
                    line = ''
                    return l
                end
            end
            l = f:read()
        end
        if openf then f:close() end
    end
end

--- read a configuration file into a table
-- @param file either a file-like object or a string, which must be a filename
-- @tab[opt] cnfg a configuration table that may contain these fields:
--
--  * `smart`  try to deduce what kind of config file we have (default false)
--  * `variabilize` make names into valid Lua identifiers (default true)
--  * `convert_numbers` try to convert values into numbers (default true)
--  * `trim_space` ensure that there is no starting or trailing whitespace with values (default true)
--  * `trim_quotes` remove quotes from strings (default false)
--  * `list_delim` delimiter to use when separating columns (default ',')
--  * `keysep` separator between key and value pairs (default '=')
--
-- @return a table containing items, or `nil`
-- @return error message (same as @{config.lines}
function config.read(file,cnfg)
    local auto

    local iter,err = config.lines(file)
    if not iter then return nil,err end
    local line = iter()
    cnfg = cnfg or {}
    if cnfg.smart then
        auto = true
        if line:match '^[^=]+=' then
            cnfg.keysep = '='
        elseif line:match '^[^:]+:' then
            cnfg.keysep = ':'
            cnfg.list_delim = ':'
        elseif line:match '^%S+%s+' then
            cnfg.keysep = ' '
            -- more than two columns assume that it's a space-delimited list
            -- cf /etc/fstab with /etc/ssh/ssh_config
            if line:match '^%S+%s+%S+%s+%S+' then
                cnfg.list_delim = ' '
            end
            cnfg.variabilize = false
        end
    end


    local function check_cnfg (var,def)
        local val = cnfg[var]
        if val == nil then return def else return val end
    end

    local initial_digits = '^[%d%+%-]'
    local t = {}
    local top_t = t
    local variabilize = check_cnfg ('variabilize',true)
    local list_delim = check_cnfg('list_delim',',')
    local convert_numbers = check_cnfg('convert_numbers',true)
    local convert_boolean = check_cnfg('convert_boolean',false)
    local trim_space = check_cnfg('trim_space',true)
    local trim_quotes = check_cnfg('trim_quotes',false)
    local ignore_assign = check_cnfg('ignore_assign',false)
    local keysep = check_cnfg('keysep','=')
    local keypat = keysep == ' ' and '%s+' or '%s*'..keysep..'%s*'
    if list_delim == ' ' then list_delim = '%s+' end

    local function process_name(key)
        if variabilize then
            key = key:gsub('[^%w]','_')
        end
        return key
    end

    local function process_value(value)
        if list_delim and value:find(list_delim) then
            value = split(value,list_delim)
            for i,v in ipairs(value) do
                value[i] = process_value(v)
            end
        elseif convert_numbers and value:find(initial_digits) then
            local val = tonumber(value)
            if not val and value:match ' kB$' then
                value = value:gsub(' kB','')
                val = tonumber(value)
            end
            if val then value = val end
        elseif convert_boolean and value == 'true' then
           return true
        elseif convert_boolean and value == 'false' then
           return false
        end
        if type(value) == 'string' then
           if trim_space then value = strip(value) end
           if not trim_quotes and auto and value:match '^"' then
                trim_quotes = true
            end
           if trim_quotes then value = strip_quotes(value) end
        end
        return value
    end

    while line do
        if line:find('^%[') then -- section!
            local section = process_name(line:match('%[([^%]]+)%]'))
            t = top_t
            t[section] = {}
            t = t[section]
        else
            line = line:gsub('^%s*','')
            local i1,i2 = line:find(keypat)
            if i1 and not ignore_assign then -- key,value assignment
                local key = process_name(line:sub(1,i1-1))
                local value = process_value(line:sub(i2+1))
                t[key] = value
            else -- a plain list of values...
                t[#t+1] = process_value(line)
            end
        end
        line = iter()
    end
    return top_t
end

return config

1	--- Reads configuration files into a Lua table.
2	-- Understands INI files, classic Unix config files, and simple
3	-- delimited columns of values. See @{06-data.md.Reading_Configuration_Files\|the Guide}
4	--
5	-- # test.config
6	-- # Read timeout in seconds
7	-- read.timeout=10
8	-- # Write timeout in seconds
9	-- write.timeout=5
10	-- #acceptable ports
11	-- ports = 1002,1003,1004
12	--
13	-- -- readconfig.lua
14	-- local config = require 'config'
15	-- local t = config.read 'test.config'
16	-- print(pretty.write(t))
17	--
18	-- ### output #####
19	-- {
20	-- ports = {
21	-- 1002,
22	-- 1003,
23	-- 1004
24	-- },
25	-- write_timeout = 5,
26	-- read_timeout = 10
27	-- }
28	--
29	-- @module pl.config
30
31	local type,tonumber,ipairs,io, table = _G.type,_G.tonumber,_G.ipairs,_G.io,_G.table	8✔
32
33	local function split(s,re)
34	local res = {}	96✔
35	local t_insert = table.insert	96✔
36	re = '[^'..re..']+'	96✔
37	for k in s:gmatch(re) do t_insert(res,k) end	600✔
38	return res	96✔
39	end
40
41	local function strip(s)
42	return s:gsub('^%s+',''):gsub('%s+$','')	472✔
43	end
44
45	local function strip_quotes (s)
46	return s:gsub("['\"](.*)['\"]",'%1')	40✔
47	end
48
49	local config = {}	8✔
50
51	--- like `io.lines`, but allows for lines to be continued with '`\\`'.
52	-- @param file a file-like object (anything where read() returns the next line) or a filename.
53	-- Defaults to standard input.
54	-- @return an iterator over the lines, or nil
55	-- @return error 'not a file-like object' or 'file is nil'
56	function config.lines(file)	8✔
57	local f,openf,err
58	local line = ''	128✔
59	if type(file) == 'string' then	128✔
60	f,err = io.open(file,'r')	×
61	if not f then return nil,err end	×
62	openf = true	×
63	else
64	f = file or io.stdin	128✔
65	if not file.read then return nil, 'not a file-like object' end	128✔
66	end
67	if not f then return nil, 'file is nil' end	128✔
68	return function()
69	local l = f:read()	520✔
70	while l do	704✔
71	-- only for non-blank lines that don't begin with either ';' or '#'
72	if l:match '%S' and not l:match '^%s*[;#]' then	576✔
73	-- does the line end with '\'?
74	local i = l:find '\\%s*$'	400✔
75	if i then -- if so,	400✔
76	line = line..l:sub(1,i-1)	12✔
77	elseif line == '' then	392✔
78	return l	384✔
79	else
80	l = line..l	8✔
81	line = ''	8✔
82	return l	8✔
83	end
84	end
85	l = f:read()	276✔
86	end
87	if openf then f:close() end	128✔
88	end
89	end
90
91	--- read a configuration file into a table
92	-- @param file either a file-like object or a string, which must be a filename
93	-- @tab[opt] cnfg a configuration table that may contain these fields:
94	--
95	-- * `smart` try to deduce what kind of config file we have (default false)
96	-- * `variabilize` make names into valid Lua identifiers (default true)
97	-- * `convert_numbers` try to convert values into numbers (default true)
98	-- * `trim_space` ensure that there is no starting or trailing whitespace with values (default true)
99	-- * `trim_quotes` remove quotes from strings (default false)
100	-- * `list_delim` delimiter to use when separating columns (default ',')
101	-- * `keysep` separator between key and value pairs (default '=')
102	--
103	-- @return a table containing items, or `nil`
104	-- @return error message (same as @{config.lines}
105	function config.read(file,cnfg)	8✔
106	local auto
107
108	local iter,err = config.lines(file)	128✔
109	if not iter then return nil,err end	128✔
110	local line = iter()	128✔
111	cnfg = cnfg or {}	128✔
112	if cnfg.smart then	128✔
113	auto = true	32✔
114	if line:match '^[^=]+=' then	32✔
115	cnfg.keysep = '='	8✔
116	elseif line:match '^[^:]+:' then	24✔
117	cnfg.keysep = ':'	8✔
118	cnfg.list_delim = ':'	8✔
119	elseif line:match '^%S+%s+' then	16✔
120	cnfg.keysep = ' '	16✔
121	-- more than two columns assume that it's a space-delimited list
122	-- cf /etc/fstab with /etc/ssh/ssh_config
123	if line:match '^%S+%s+%S+%s+%S+' then	16✔
124	cnfg.list_delim = ' '	8✔
125	end
126	cnfg.variabilize = false	16✔
127	end
128	end
129
130
131	local function check_cnfg (var,def)
132	local val = cnfg[var]	1,024✔
133	if val == nil then return def else return val end	1,024✔
134	end
135
136	local initial_digits = '^[%d%+%-]'	128✔
137	local t = {}	128✔
138	local top_t = t	128✔
139	local variabilize = check_cnfg ('variabilize',true)	128✔
140	local list_delim = check_cnfg('list_delim',',')	128✔
141	local convert_numbers = check_cnfg('convert_numbers',true)	128✔
142	local convert_boolean = check_cnfg('convert_boolean',false)	128✔
143	local trim_space = check_cnfg('trim_space',true)	128✔
144	local trim_quotes = check_cnfg('trim_quotes',false)	128✔
145	local ignore_assign = check_cnfg('ignore_assign',false)	128✔
146	local keysep = check_cnfg('keysep','=')	128✔
147	local keypat = keysep == ' ' and '%s+' or '%s'..keysep..'%s'	128✔
148	if list_delim == ' ' then list_delim = '%s+' end	128✔
149
150	local function process_name(key)
151	if variabilize then	328✔
152	key = key:gsub('[^%w]','_')	256✔
153	end
154	return key	328✔
155	end
156
157	local function process_value(value)
158	if list_delim and value:find(list_delim) then	880✔
159	value = split(value,list_delim)	144✔
160	for i,v in ipairs(value) do	600✔
161	value[i] = process_value(v)	756✔
162	end
163	elseif convert_numbers and value:find(initial_digits) then	784✔
164	local val = tonumber(value)	328✔
165	if not val and value:match ' kB$' then	328✔
166	value = value:gsub(' kB','')	32✔
167	val = tonumber(value)	32✔
168	end
169	if val then value = val end	328✔
170	elseif convert_boolean and value == 'true' then	456✔
171	return true	8✔
172	elseif convert_boolean and value == 'false' then	448✔
173	return false	8✔
174	end
175	if type(value) == 'string' then	864✔
176	if trim_space then value = strip(value) end	708✔
177	if not trim_quotes and auto and value:match '^"' then	472✔
178	trim_quotes = true	8✔
179	end
180	if trim_quotes then value = strip_quotes(value) end	492✔
181	end
182	return value	864✔
183	end
184
185	while line do	520✔
186	if line:find('^%[') then -- section!	392✔
187	local section = process_name(line:match('%[([^%]]+)%]'))	16✔
188	t = top_t	16✔
189	t[section] = {}	16✔
190	t = t[section]	16✔
191	else
192	line = line:gsub('^%s*','')	376✔
193	local i1,i2 = line:find(keypat)	376✔
194	if i1 and not ignore_assign then -- key,value assignment	376✔
195	local key = process_name(line:sub(1,i1-1))	468✔
196	local value = process_value(line:sub(i2+1))	468✔
197	t[key] = value	312✔
198	else -- a plain list of values...
199	t[#t+1] = process_value(line)	96✔
200	end
201	end
202	line = iter()	588✔
203	end
204	return top_t	128✔
205	end
206
207	return config	8✔

lunarmodules / Penlight / 478

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