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<td class='lines'><pre><code><span class="hl slc">-- serialize.lua</span>
<span class="hl slc">-- Lua-conformant library file that has no minetest dependencies</span>
<span class="hl slc">-- Contains the serialization and deserialization routines</span>
<span class="hl com">--[[</span>
<span class="hl com">Version history:</span>
<span class="hl com">1 - initial</span>
<span class="hl com">2 - also escaping CR character as &r</span>
<span class="hl com"></span>
<span class="hl com">Structure of entry:</span>
<span class="hl com">[keytype][key]:[valuetype][val]</span>
<span class="hl com">Types:</span>
<span class="hl com"> B - bool</span>
<span class="hl com"> -> 0=false, 1=true</span>
<span class="hl com"> S - string</span>
<span class="hl com"> -> see below</span>
<span class="hl com"> N - number</span>
<span class="hl com"> -> thing compatible with tonumber()</span>
<span class="hl com">Table:</span>
<span class="hl com">[keytype][key]:T</span>
<span class="hl com">... content is nested in table until the matching</span>
<span class="hl com">E</span>
<span class="hl com"></span>
<span class="hl com">example:</span>
<span class="hl com">LUA_SER v=2 {</span>
<span class="hl com">Skey:Svalue key = "value",</span>
<span class="hl com">N1:Seins [1] = "eins",</span>
<span class="hl com">B1:T [true] = {</span>
<span class="hl com">Sa:Sb a = "b",</span>
<span class="hl com">Sc:B0 c = false,</span>
<span class="hl com">E }</span>
<span class="hl com">E }</span>
<span class="hl com"></span>
<span class="hl com">String representations:</span>
<span class="hl com">In strings the following characters are escaped by &</span>
<span class="hl com">'&' -> '&&'</span>
<span class="hl com">(line break) -> '&n'</span>
<span class="hl com">(CR) -> '&r'</span>
<span class="hl com">':' -> '&:'</span>
<span class="hl com">All other characters are unchanged as they bear no special meaning.</span>
<span class="hl com">]]</span>
<span class="hl kwa">local</span> write_table<span class="hl opt">,</span> literal_to_string<span class="hl opt">,</span> escape_chars<span class="hl opt">,</span> table_is_empty
<span class="hl kwa">function</span> <span class="hl kwd">table_is_empty</span><span class="hl opt">(</span>t<span class="hl opt">)</span>
<span class="hl kwa">for</span> _<span class="hl opt">,</span>_ <span class="hl kwa">in</span> <span class="hl kwd">pairs</span><span class="hl opt">(</span>t<span class="hl opt">)</span> <span class="hl kwa">do</span>
<span class="hl kwa">return false</span>
<span class="hl kwa">end</span>
<span class="hl kwa">return true</span>
<span class="hl kwa">end</span>
<span class="hl kwa">function</span> <span class="hl kwd">write_table</span><span class="hl opt">(</span>t<span class="hl opt">,</span> file<span class="hl opt">,</span> config<span class="hl opt">)</span>
<span class="hl kwa">local</span> ks<span class="hl opt">,</span> vs<span class="hl opt">,</span> writeit<span class="hl opt">,</span> istable
<span class="hl kwa">for</span> key<span class="hl opt">,</span> value <span class="hl kwa">in</span> <span class="hl kwd">pairs</span><span class="hl opt">(</span>t<span class="hl opt">)</span> <span class="hl kwa">do</span>
ks <span class="hl opt">=</span> <span class="hl kwd">value_to_string</span><span class="hl opt">(</span>key<span class="hl opt">,</span> <span class="hl kwa">false</span><span class="hl opt">)</span>
writeit <span class="hl opt">=</span> <span class="hl kwa">true</span>
istable <span class="hl opt">=</span> <span class="hl kwb">type</span><span class="hl opt">(</span>value<span class="hl opt">)==</span><span class="hl str">"table"</span>
<span class="hl kwa">if</span> istable <span class="hl kwa">then</span>
vs <span class="hl opt">=</span> <span class="hl str">"T"</span>
<span class="hl kwa">if</span> config <span class="hl kwa">and</span> config<span class="hl opt">.</span>skip_empty_tables <span class="hl kwa">then</span>
writeit <span class="hl opt">=</span> <span class="hl kwa">not</span> <span class="hl kwd">table_is_empty</span><span class="hl opt">(</span>value<span class="hl opt">)</span>
<span class="hl kwa">end</span>
<span class="hl kwa">else</span>
vs <span class="hl opt">=</span> <span class="hl kwd">value_to_string</span><span class="hl opt">(</span>value<span class="hl opt">,</span> <span class="hl kwa">true</span><span class="hl opt">)</span>
<span class="hl kwa">end</span>
<span class="hl kwa">if</span> writeit <span class="hl kwa">then</span>
file<span class="hl opt">:</span><span class="hl kwb">write</span><span class="hl opt">(</span>ks<span class="hl opt">..</span><span class="hl str">":"</span><span class="hl opt">..</span>vs<span class="hl opt">..</span><span class="hl str">"</span><span class="hl esc">\n</span><span class="hl str">"</span><span class="hl opt">)</span>
<span class="hl kwa">if</span> istable <span class="hl kwa">then</span>
<span class="hl kwd">write_table</span><span class="hl opt">(</span>value<span class="hl opt">,</span> file<span class="hl opt">,</span> config<span class="hl opt">)</span>
file<span class="hl opt">:</span><span class="hl kwb">write</span><span class="hl opt">(</span><span class="hl str">"E</span><span class="hl esc">\n</span><span class="hl str">"</span><span class="hl opt">)</span>
<span class="hl kwa">end</span>
<span class="hl kwa">end</span>
<span class="hl kwa">end</span>
<span class="hl kwa">end</span>
<span class="hl kwa">function</span> <span class="hl kwd">value_to_string</span><span class="hl opt">(</span>t<span class="hl opt">)</span>
<span class="hl kwa">if</span> <span class="hl kwb">type</span><span class="hl opt">(</span>t<span class="hl opt">)==</span><span class="hl str">"table"</span> <span class="hl kwa">then</span>
file<span class="hl opt">:</span><span class="hl kwd">close</span><span class="hl opt">()</span>
<span class="hl kwb">error</span><span class="hl opt">(</span><span class="hl str">"Can not serialize a table in the key position!"</span><span class="hl opt">)</span>
<span class="hl kwa">elseif</span> <span class="hl kwb">type</span><span class="hl opt">(</span>t<span class="hl opt">)==</span><span class="hl str">"boolean"</span> <span class="hl kwa">then</span>
<span class="hl kwa">if</span> t <span class="hl kwa">then</span>
<span class="hl kwa">return</span> <span class="hl str">"B1"</span>
<span class="hl kwa">else</span>
<span class="hl kwa">return</span> <span class="hl str">"B0"</span>
<span class="hl kwa">end</span>
<span class="hl kwa">elseif</span> <span class="hl kwb">type</span><span class="hl opt">(</span>t<span class="hl opt">)==</span><span class="hl str">"number"</span> <span class="hl kwa">then</span>
<span class="hl kwa">return</span> <span class="hl str">"N"</span><span class="hl opt">..</span>t
<span class="hl kwa">elseif</span> <span class="hl kwb">type</span><span class="hl opt">(</span>t<span class="hl opt">)==</span><span class="hl str">"string"</span> <span class="hl kwa">then</span>
<span class="hl kwa">return</span> <span class="hl str">"S"</span><span class="hl opt">..</span><span class="hl kwd">escape_chars</span><span class="hl opt">(</span>t<span class="hl opt">)</span>
<span class="hl kwa">else</span>
<span class="hl slc">--error("Can not serialize '"..type(t).."' type!")</span>
<span class="hl kwa">return</span> <span class="hl str">"S<function>"</span>
<span class="hl kwa">end</span>
<span class="hl kwa">return</span> str
<span class="hl kwa">end</span>
<span class="hl kwa">function</span> <span class="hl kwd">escape_chars</span><span class="hl opt">(</span>str<span class="hl opt">)</span>
<span class="hl kwa">local</span> rstr <span class="hl opt">=</span> <span class="hl kwb">string</span><span class="hl opt">.</span><span class="hl kwb">gsub</span><span class="hl opt">(</span>str<span class="hl opt">,</span> <span class="hl str">"&"</span><span class="hl opt">,</span> <span class="hl str">"&&"</span><span class="hl opt">)</span>
rstr <span class="hl opt">=</span> <span class="hl kwb">string</span><span class="hl opt">.</span><span class="hl kwb">gsub</span><span class="hl opt">(</span>rstr<span class="hl opt">,</span> <span class="hl str">":"</span><span class="hl opt">,</span> <span class="hl str">"&:"</span><span class="hl opt">)</span>
rstr <span class="hl opt">=</span> <span class="hl kwb">string</span><span class="hl opt">.</span><span class="hl kwb">gsub</span><span class="hl opt">(</span>rstr<span class="hl opt">,</span> <span class="hl str">"</span><span class="hl esc">\r</span><span class="hl str">"</span><span class="hl opt">,</span> <span class="hl str">"&r"</span><span class="hl opt">)</span>
rstr <span class="hl opt">=</span> <span class="hl kwb">string</span><span class="hl opt">.</span><span class="hl kwb">gsub</span><span class="hl opt">(</span>rstr<span class="hl opt">,</span> <span class="hl str">"</span><span class="hl esc">\n</span><span class="hl str">"</span><span class="hl opt">,</span> <span class="hl str">"&n"</span><span class="hl opt">)</span>
<span class="hl kwa">return</span> rstr
<span class="hl kwa">end</span>
<span class="hl slc">------</span>
<span class="hl kwa">local</span> read_table<span class="hl opt">,</span> string_to_value<span class="hl opt">,</span> unescape_chars
<span class="hl kwa">function</span> <span class="hl kwd">read_table</span><span class="hl opt">(</span>t<span class="hl opt">,</span> file<span class="hl opt">)</span>
<span class="hl kwa">local</span> line<span class="hl opt">,</span> ks<span class="hl opt">,</span> vs<span class="hl opt">,</span> kv<span class="hl opt">,</span> vv<span class="hl opt">,</span> vt
<span class="hl kwa">while true do</span>
line <span class="hl opt">=</span> file<span class="hl opt">:</span><span class="hl kwb">read</span><span class="hl opt">(</span><span class="hl str">"*l"</span><span class="hl opt">)</span>
<span class="hl kwa">if not</span> line <span class="hl kwa">then</span>
file<span class="hl opt">:</span><span class="hl kwd">close</span><span class="hl opt">()</span>
<span class="hl kwb">error</span><span class="hl opt">(</span><span class="hl str">"Unexpected EOF or read error!"</span><span class="hl opt">)</span>
<span class="hl kwa">end</span>
<span class="hl kwa">if</span> line<span class="hl opt">==</span><span class="hl str">"E"</span> <span class="hl kwa">then</span>
<span class="hl slc">-- done with this table</span>
<span class="hl kwa">return</span>
<span class="hl kwa">end</span>
ks<span class="hl opt">,</span> vs <span class="hl opt">=</span> <span class="hl kwb">string</span><span class="hl opt">.</span><span class="hl kwd">match</span><span class="hl opt">(</span>line<span class="hl opt">,</span> <span class="hl str">"^(.*[^&]):(.+)$"</span><span class="hl opt">)</span>
<span class="hl kwa">if not</span> ks <span class="hl kwa">or not</span> vs <span class="hl kwa">then</span>
file<span class="hl opt">:</span><span class="hl kwd">close</span><span class="hl opt">()</span>
<span class="hl kwb">error</span><span class="hl opt">(</span><span class="hl str">"Unable to parse line: '"</span><span class="hl opt">..</span>line<span class="hl opt">..</span><span class="hl str">"'!"</span><span class="hl opt">)</span>
<span class="hl kwa">end</span>
kv <span class="hl opt">=</span> <span class="hl kwd">string_to_value</span><span class="hl opt">(</span>ks<span class="hl opt">)</span>
vv<span class="hl opt">,</span> vt <span class="hl opt">=</span> <span class="hl kwd">string_to_value</span><span class="hl opt">(</span>vs<span class="hl opt">,</span> <span class="hl kwa">true</span><span class="hl opt">)</span>
<span class="hl kwa">if</span> vt <span class="hl kwa">then</span>
<span class="hl kwd">read_table</span><span class="hl opt">(</span>vv<span class="hl opt">,</span> file<span class="hl opt">)</span>
<span class="hl kwa">end</span>
<span class="hl slc">-- put read value in table</span>
t<span class="hl opt">[</span>kv<span class="hl opt">] =</span> vv
<span class="hl kwa">end</span>
<span class="hl kwa">end</span>
<span class="hl slc">-- returns: value, is_table</span>
<span class="hl kwa">function</span> <span class="hl kwd">string_to_value</span><span class="hl opt">(</span>str<span class="hl opt">,</span> table_allow<span class="hl opt">)</span>
<span class="hl kwa">local</span> first <span class="hl opt">=</span> <span class="hl kwb">string</span><span class="hl opt">.</span><span class="hl kwd">sub</span><span class="hl opt">(</span>str<span class="hl opt">,</span> <span class="hl num">1</span><span class="hl opt">,</span><span class="hl num">1</span><span class="hl opt">)</span>
<span class="hl kwa">local</span> rest <span class="hl opt">=</span> <span class="hl kwb">string</span><span class="hl opt">.</span><span class="hl kwd">sub</span><span class="hl opt">(</span>str<span class="hl opt">,</span> <span class="hl num">2</span><span class="hl opt">)</span>
<span class="hl kwa">if</span> first<span class="hl opt">==</span><span class="hl str">"T"</span> <span class="hl kwa">then</span>
<span class="hl kwa">if</span> table_allow <span class="hl kwa">then</span>
<span class="hl kwa">return</span> <span class="hl opt">{},</span> <span class="hl kwa">true</span>
<span class="hl kwa">else</span>
file<span class="hl opt">:</span><span class="hl kwd">close</span><span class="hl opt">()</span>
<span class="hl kwb">error</span><span class="hl opt">(</span><span class="hl str">"Table not allowed in key component!"</span><span class="hl opt">)</span>
<span class="hl kwa">end</span>
<span class="hl kwa">elseif</span> first<span class="hl opt">==</span><span class="hl str">"N"</span> <span class="hl kwa">then</span>
<span class="hl kwa">local</span> num <span class="hl opt">=</span> <span class="hl kwb">tonumber</span><span class="hl opt">(</span>rest<span class="hl opt">)</span>
<span class="hl kwa">if</span> num <span class="hl kwa">then</span>
<span class="hl kwa">return</span> num
<span class="hl kwa">else</span>
file<span class="hl opt">:</span><span class="hl kwd">close</span><span class="hl opt">()</span>
<span class="hl kwb">error</span><span class="hl opt">(</span><span class="hl str">"Unable to parse number: '"</span><span class="hl opt">..</span>rest<span class="hl opt">..</span><span class="hl str">"'!"</span><span class="hl opt">)</span>
<span class="hl kwa">end</span>
<span class="hl kwa">elseif</span> first<span class="hl opt">==</span><span class="hl str">"B"</span> <span class="hl kwa">then</span>
<span class="hl kwa">if</span> rest<span class="hl opt">==</span><span class="hl str">"0"</span> <span class="hl kwa">then</span>
<span class="hl kwa">return false</span>
<span class="hl kwa">elseif</span> rest<span class="hl opt">==</span><span class="hl str">"1"</span> <span class="hl kwa">then</span>
<span class="hl kwa">return true</span>
<span class="hl kwa">else</span>
file<span class="hl opt">:</span><span class="hl kwd">close</span><span class="hl opt">()</span>
<span class="hl kwb">error</span><span class="hl opt">(</span><span class="hl str">"Unable to parse boolean: '"</span><span class="hl opt">..</span>rest<span class="hl opt">..</span><span class="hl str">"'!"</span><span class="hl opt">)</span>
<span class="hl kwa">end</span>
<span class="hl kwa">elseif</span> first<span class="hl opt">==</span><span class="hl str">"S"</span> <span class="hl kwa">then</span>
<span class="hl kwa">return</span> <span class="hl kwd">unescape_chars</span><span class="hl opt">(</span>rest<span class="hl opt">)</span>
<span class="hl kwa">else</span>
file<span class="hl opt">:</span><span class="hl kwd">close</span><span class="hl opt">()</span>
<span class="hl kwb">error</span><span class="hl opt">(</span><span class="hl str">"Unknown literal type '"</span><span class="hl opt">..</span>first<span class="hl opt">..</span><span class="hl str">"' for literal '"</span><span class="hl opt">..</span>str<span class="hl opt">..</span><span class="hl str">"'!"</span><span class="hl opt">)</span>
<span class="hl kwa">end</span>
<span class="hl kwa">end</span>
<span class="hl kwa">function</span> <span class="hl kwd">unescape_chars</span><span class="hl opt">(</span>str<span class="hl opt">)</span> <span class="hl slc">--TODO</span>
<span class="hl kwa">local</span> rstr <span class="hl opt">=</span> <span class="hl kwb">string</span><span class="hl opt">.</span><span class="hl kwb">gsub</span><span class="hl opt">(</span>str<span class="hl opt">,</span> <span class="hl str">"&:"</span><span class="hl opt">,</span> <span class="hl str">":"</span><span class="hl opt">)</span>
rstr <span class="hl opt">=</span> <span class="hl kwb">string</span><span class="hl opt">.</span><span class="hl kwb">gsub</span><span class="hl opt">(</span>rstr<span class="hl opt">,</span> <span class="hl str">"&n"</span><span class="hl opt">,</span> <span class="hl str">"</span><span class="hl esc">\n</span><span class="hl str">"</span><span class="hl opt">)</span>
rstr <span class="hl opt">=</span> <span class="hl kwb">string</span><span class="hl opt">.</span><span class="hl kwb">gsub</span><span class="hl opt">(</span>rstr<span class="hl opt">,</span> <span class="hl str">"&r"</span><span class="hl opt">,</span> <span class="hl str">"</span><span class="hl esc">\r</span><span class="hl str">"</span><span class="hl opt">)</span>
rstr <span class="hl opt">=</span> <span class="hl kwb">string</span><span class="hl opt">.</span><span class="hl kwb">gsub</span><span class="hl opt">(</span>rstr<span class="hl opt">,</span> <span class="hl str">"&&"</span><span class="hl opt">,</span> <span class="hl str">"&"</span><span class="hl opt">)</span>
<span class="hl kwa">return</span> rstr
<span class="hl kwa">end</span>
<span class="hl slc">------</span>
<span class="hl com">--[[</span>
<span class="hl com">config = {</span>
<span class="hl com"> skip_empty_tables = false -- if true, does not store empty tables</span>
<span class="hl com"> -- On next read, keys that mapped to empty tables resolve to nil</span>
<span class="hl com">}</span>
<span class="hl com">]]</span>
<span class="hl slc">-- Writes the passed table into the passed file descriptor, and closes the file</span>
<span class="hl kwa">local function</span> <span class="hl kwd">write_to_fd</span><span class="hl opt">(</span>root_table<span class="hl opt">,</span> file<span class="hl opt">,</span> config<span class="hl opt">)</span>
file<span class="hl opt">:</span><span class="hl kwb">write</span><span class="hl opt">(</span><span class="hl str">"LUA_SER v=2</span><span class="hl esc">\n</span><span class="hl str">"</span><span class="hl opt">)</span>
<span class="hl kwd">write_table</span><span class="hl opt">(</span>root_table<span class="hl opt">,</span> file<span class="hl opt">,</span> config<span class="hl opt">)</span>
file<span class="hl opt">:</span><span class="hl kwb">write</span><span class="hl opt">(</span><span class="hl str">"E</span><span class="hl esc">\n</span><span class="hl str">END_SER</span><span class="hl esc">\n</span><span class="hl str">"</span><span class="hl opt">)</span>
file<span class="hl opt">:</span><span class="hl kwd">close</span><span class="hl opt">()</span>
<span class="hl kwa">end</span>
<span class="hl slc">-- Reads the file contents from the passed file descriptor and returns the table on success</span>
<span class="hl slc">-- Throws errors when something is wrong. Closes the file.</span>
<span class="hl slc">-- config: see above</span>
<span class="hl kwa">local function</span> <span class="hl kwd">read_from_fd</span><span class="hl opt">(</span>file<span class="hl opt">)</span>
<span class="hl kwa">local</span> first_line <span class="hl opt">=</span> file<span class="hl opt">:</span><span class="hl kwb">read</span><span class="hl opt">(</span><span class="hl str">"*line"</span><span class="hl opt">)</span>
<span class="hl kwa">if not</span> <span class="hl kwb">string</span><span class="hl opt">.</span><span class="hl kwd">match</span><span class="hl opt">(</span>first_line<span class="hl opt">,</span> <span class="hl str">"LUA_SER v=[12]"</span><span class="hl opt">)</span> <span class="hl kwa">then</span>
file<span class="hl opt">:</span><span class="hl kwd">close</span><span class="hl opt">()</span>
<span class="hl kwb">error</span><span class="hl opt">(</span><span class="hl str">"Expected header, got '"</span><span class="hl opt">..</span>first_line<span class="hl opt">..</span><span class="hl str">"' instead!"</span><span class="hl opt">)</span>
<span class="hl kwa">end</span>
<span class="hl kwa">local</span> t <span class="hl opt">= {}</span>
<span class="hl kwd">read_table</span><span class="hl opt">(</span>t<span class="hl opt">,</span> file<span class="hl opt">)</span>
<span class="hl kwa">local</span> last_line <span class="hl opt">=</span> file<span class="hl opt">:</span><span class="hl kwb">read</span><span class="hl opt">(</span><span class="hl str">"*line"</span><span class="hl opt">)</span>
file<span class="hl opt">:</span><span class="hl kwd">close</span><span class="hl opt">()</span>
<span class="hl kwa">if</span> last_line <span class="hl opt">~=</span> <span class="hl str">"END_SER"</span> <span class="hl kwa">then</span>
<span class="hl kwb">error</span><span class="hl opt">(</span><span class="hl str">"Missing END_SER, got '"</span><span class="hl opt">..</span>last_line<span class="hl opt">..</span><span class="hl str">"' instead!"</span><span class="hl opt">)</span>
<span class="hl kwa">end</span>
<span class="hl kwa">return</span> t
<span class="hl kwa">end</span>
<span class="hl slc">-- Opens the passed filename and serializes root_table into it</span>
<span class="hl slc">-- config: see above</span>
<span class="hl kwa">function</span> <span class="hl kwd">write_to_file</span><span class="hl opt">(</span>root_table<span class="hl opt">,</span> filename<span class="hl opt">,</span> config<span class="hl opt">)</span>
<span class="hl slc">-- try opening the file</span>
<span class="hl kwa">local</span> file<span class="hl opt">,</span> err <span class="hl opt">=</span> io<span class="hl opt">.</span><span class="hl kwd">open</span><span class="hl opt">(</span>filename<span class="hl opt">,</span> <span class="hl str">"wb"</span><span class="hl opt">)</span>
<span class="hl kwa">if not</span> file <span class="hl kwa">then</span>
<span class="hl kwb">error</span><span class="hl opt">(</span><span class="hl str">"Failed opening file '"</span><span class="hl opt">..</span>filename<span class="hl opt">..</span><span class="hl str">"' for write:</span><span class="hl esc">\n</span><span class="hl str">"</span><span class="hl opt">..</span>err<span class="hl opt">)</span>
<span class="hl kwa">end</span>
<span class="hl kwd">write_to_fd</span><span class="hl opt">(</span>root_table<span class="hl opt">,</span> file<span class="hl opt">,</span> config<span class="hl opt">)</span>
<span class="hl kwa">return true</span>
<span class="hl kwa">end</span>
<span class="hl slc">-- Opens the passed filename, and returns its deserialized contents</span>
<span class="hl kwa">function</span> <span class="hl kwd">read_from_file</span><span class="hl opt">(</span>filename<span class="hl opt">)</span>
<span class="hl slc">-- try opening the file</span>
<span class="hl kwa">local</span> file<span class="hl opt">,</span> err <span class="hl opt">=</span> io<span class="hl opt">.</span><span class="hl kwd">open</span><span class="hl opt">(</span>filename<span class="hl opt">,</span> <span class="hl str">"rb"</span><span class="hl opt">)</span>
<span class="hl kwa">if not</span> file <span class="hl kwa">then</span>
<span class="hl kwb">error</span><span class="hl opt">(</span><span class="hl str">"Failed opening file '"</span><span class="hl opt">..</span>filename<span class="hl opt">..</span><span class="hl str">"' for read:</span><span class="hl esc">\n</span><span class="hl str">"</span><span class="hl opt">..</span>err<span class="hl opt">)</span>
<span class="hl kwa">end</span>
<span class="hl kwa">return</span> <span class="hl kwd">read_from_fd</span><span class="hl opt">(</span>file<span class="hl opt">)</span>
<span class="hl kwa">end</span>
<span class="hl com">--[[ simple unit test</span>
<span class="hl com">local testtable = {</span>
<span class="hl com"> key = "value",</span>
<span class="hl com"> [1] = "eins",</span>
<span class="hl com"> [true] = {</span>
<span class="hl com"> a = "b",</span>
<span class="hl com"> c = false,</span>
<span class="hl com"> },</span>
<span class="hl com"> ["es:cape1"] = "foo:bar",</span>
<span class="hl com"> ["es&ca\npe2"] = "baz&bam\nbim",</span>
<span class="hl com"> ["es&&ca&\npe3"] = "baz&&bam&\nbim",</span>
<span class="hl com"> ["es&:cape4"] = "foo\n:bar"</span>
<span class="hl com">}</span>
<span class="hl com">local config = {}</span>
<span class="hl com">--write_to_file(testtable, "test_out", config)</span>
<span class="hl com">local t = read_from_file("test_out")</span>
<span class="hl com">write_to_file(t, "test_out_2", config)</span>
<span class="hl com">local t2 = read_from_file("test_out_2")</span>
<span class="hl com">write_to_file(t2, "test_out_3", config)</span>
<span class="hl com"></span>
<span class="hl com">-- test_out_2 and test_out_3 should be equal</span>
<span class="hl com"></span>
<span class="hl com">--]]</span>
<span class="hl kwa">return</span> <span class="hl opt">{</span>
read_from_fd <span class="hl opt">=</span> read_from_fd<span class="hl opt">,</span>
write_to_fd <span class="hl opt">=</span> write_to_fd<span class="hl opt">,</span>
read_from_file <span class="hl opt">=</span> read_from_file<span class="hl opt">,</span>
write_to_file <span class="hl opt">=</span> write_to_file<span class="hl opt">,</span>
<span class="hl opt">}</span>