87 lines
3.0 KiB
Lua
87 lines
3.0 KiB
Lua
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handle_schematics = {}
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-- taken from https://github.com/MirceaKitsune/minetest_mods_structures/blob/master/structures_io.lua (Taokis Sructures I/O mod)
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-- gets the size of a structure file
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-- nodenames: contains all the node names that are used in the schematic
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-- on_constr: lists all the node names for which on_construct has to be called after placement of the schematic
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handle_schematics.analyze_mts_file = function( path )
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local size = { x = 0, y = 0, z = 0, version = 0 }
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local version = 0;
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local file = io.open(path..'.mts', "r")
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if (file == nil) then
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return nil
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end
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-- thanks to sfan5 for this advanced code that reads the size from schematic files
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local read_s16 = function(fi)
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return string.byte(fi:read(1)) * 256 + string.byte(fi:read(1))
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end
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local function get_schematic_size(f)
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-- make sure those are the first 4 characters, otherwise this might be a corrupt file
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if f:read(4) ~= "MTSM" then
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return nil
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end
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-- advance 2 more characters
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local version = read_s16(f); --f:read(2)
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-- the next characters here are our size, read them
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return read_s16(f), read_s16(f), read_s16(f), version
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end
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size.x, size.y, size.z, size.version = get_schematic_size(file)
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-- read the slice probability for each y value that was introduced in version 3
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if( size.version >= 3 ) then
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-- the probability is not very intresting for buildings so we just skip it
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file:read( size.y );
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end
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-- this list is not yet used for anything
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local nodenames = {};
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-- this list is needed for calling on_construct after place_schematic
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local on_constr = {};
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-- nodes that require after_place_node to be called
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local after_place_node = {};
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-- after that: read_s16 (2 bytes) to find out how many diffrent nodenames (node_name_count) are present in the file
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local node_name_count = read_s16( file );
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for i = 1, node_name_count do
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-- the length of the next name
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local name_length = read_s16( file );
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-- the text of the next name
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local name_text = file:read( name_length );
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table.insert( nodenames, name_text );
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-- in order to get this information, the node has to be defined and loaded
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if( minetest.registered_nodes[ name_text ] and minetest.registered_nodes[ name_text ].on_construct) then
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table.insert( on_constr, name_text );
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end
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-- some nodes need after_place_node to be called for initialization
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if( minetest.registered_nodes[ name_text ] and minetest.registered_nodes[ name_text ].after_place_node) then
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table.insert( after_place_node, name_text );
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end
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end
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file.close(file)
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local rotated = 0;
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local burried = 0;
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local parts = path:split('_');
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if( parts and #parts > 2 ) then
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if( parts[#parts]=="0" or parts[#parts]=="90" or parts[#parts]=="180" or parts[#parts]=="270" ) then
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rotated = tonumber( parts[#parts] );
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burried = tonumber( parts[ #parts-1 ] );
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if( not( burried ) or burried>20 or burried<0) then
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burried = 0;
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end
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end
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end
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return { size = { x=size.x, y=size.y, z=size.z}, nodenames = nodenames, on_constr = on_constr, after_place_node = after_place_node, rotated=rotated, burried=burried };
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end
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