HOW-TO: Convert 5.02 to 5.1


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HOW-TO: Convert 5.02 to 5.1

Started by TTB, 27 July, 2006, 12:04:22

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There are a lot of requests to convert scripts from 5.02 to 5.1. Here is a little help (source = ). Maybe ppl can try this first on their own instead of requesting before they have even tried.

Here we list the incompatibilities that may be found when moving a program from Lua 5.0 to Lua 5.1. You can avoid most of the incompatibilities compiling Lua with appropriate options (see file luaconf.h). However, all these compatibility options will be removed in the next version of Lua.

7.1 - Changes in the Language

    * The vararg system changed from the pseudo-argument arg with a table with the extra arguments to the vararg expression. (Option LUA_COMPAT_VARARG in luaconf.h.)
    * There was a subtle change in the scope of the implicit variables of the for statement and for the repeat statement.
    * The long string/long comment syntax ([[string]]) does not allow nesting. You can use the new syntax ([=[string]=]) in these cases. (Option LUA_COMPAT_LSTR in luaconf.h.)

7.2 - Changes in the Libraries

    * Function string.gfind was renamed string.gmatch. (Option LUA_COMPAT_GFIND)
    * When string.gsub is called with a function as its third argument, whenever this function returns nil or false the replacement string is the whole match, instead of the empty string.
    * Function table.setn was deprecated. Function table.getn corresponds to the new length operator (#); use the operator instead of the function. (Option LUA_COMPAT_GETN)
    * Function loadlib was renamed package.loadlib. (Option LUA_COMPAT_LOADLIB)
    * Function math.mod was renamed math.fmod. (Option LUA_COMPAT_MOD)
    * Functions table.foreach and table.foreachi are deprecated. You can use a for loop with pairs or ipairs instead.
    * There were substantial changes in function require due to the new module system. However, the new behavior is mostly compatible with the old, but require gets the path from package.path instead of from LUA_PATH.
    * Function collectgarbage has different arguments. Function gcinfo is deprecated; use collectgarbage("count") instead.

Gr, TTB.


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...tutorial TTB!
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