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-- Gemeinschaft 5 module: array functions
-- (c) AMOOMA GmbH 2013
--
module(...,package.seeall)
MAX_JSON_DEPTH = 100;
function try(array, arguments)
if type(arguments) ~= 'string' or type(array) ~= 'table' then
return nil;
end
local result = array;
arguments:gsub('([^%.]+)', function(entry)
local success, result = pcall(function() result = (result[tonumber(entry) or entry]); end);
end);
return result;
end
function set(array, arguments, value)
local nop, arguments_count = arguments:gsub('%.', '');
local structure = array;
arguments:gsub('([^%.]+)', function(entry)
if arguments_count <= 0 then
structure[entry] = value;
elseif type(structure[entry]) == 'table' then
structure = structure[entry];
else
structure[entry] = {};
structure = structure[entry];
end
arguments_count = arguments_count - 1;
end);
end
function expand_variable(variable_path, variable_sets)
for index=1, #variable_sets do
local result = try(variable_sets[index], variable_path);
if result then
return result;
end
end
end
-- replace variables in a string by array values
function expand_variables(line, ...)
local variable_sets = {...};
return (line:gsub('{([%a%d%._]+)}', function(captured)
return expand_variable(captured, variable_sets);
end))
end
-- concatenate array values
function to_s(array, separator, prefix, suffix)
require 'common.str';
local buffer = '';
for key, value in pairs(array) do
buffer = common.str.append(buffer, value, separator, prefix, suffix);
end
return buffer;
end
-- concatenate array keys
function keys_to_s(array, separator, prefix, suffix)
require 'common.str';
local buffer = '';
for key, value in pairs(array) do
buffer = common.str.append(buffer, key, separator, prefix, suffix);
end
return buffer;
end
-- convert to JSON
function to_json(array, max_depth)
max_depth = tonumber(max_depth) or MAX_JSON_DEPTH;
max_depth = max_depth - 1;
if max_depth <= 0 then
return 'null';
end
require 'common.str';
local buffer = '{';
for key, value in pairs(array) do
if type(value) == 'table' then
buffer = buffer .. '"' .. key .. '":' .. to_json(value, max_depth) .. ',';
else
buffer = buffer .. '"' .. key .. '":' .. common.str.to_json(value) .. ',';
end
end
if buffer:sub(-1) == ',' then
buffer = buffer:sub(1, -2);
end
buffer = buffer .. '}';
return buffer;
end
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