 local function removecommonprefix(str1, str2)
  -- Retourne str1 moins ses premiers mots qui correspondent aux premiers mots de str2
  -- Exemple : removecommonprefix('droit rural', 'droit privé') retourne 'rural'
  -- removecommonprefix('droit privé', 'droit') retourne 'privé'
  -- Il doit exister des césures dans au moins une des deux chaînes
  if (string.find(str1, ' ', 1, true) == nil) and (string.find(str2, ' ', 1, true) == nil) then
    return str1
  end
  -- Faire en sorte que la chaîne retournée ne commence pas par une espace
  sought = str2..' '
  lensought = string.len(sought)
  while (lensought > 0) and (string.find(str1, string.sub(sought, 1, lensought), 1, true) == nil) do
  	lensought = lensought - 1
  end
  -- print('>'..string.sub(str1, lensought+1, lensought+1)..'<')
  print(string.sub(str2, lensought+1, lensought+2) ~= '')
  -- (lensought == 0) si les chaînes n’ont rien en commun
  -- (string.sub(str1, lensought+1, lensought+1) ~= ' ') si la partie commune de str1 n’est pas un mot entier
  -- (string.sub(str2, lensought+1, lensought+2) ~= 's ') laisse passer le cas où str2 commence par le pluriel de str1
  -- (string.sub(str2, lensought+1, lensought+2) ~= '') laisse passer les cas où str1 inclut str2 au complet
  if (lensought == 0) or ((string.sub(str1, lensought+1, lensought+1) ~= ' ') and (string.sub(str2, lensought+1, lensought+2) ~= 's ') and (string.sub(str2, lensought+1, lensought+2) ~= '')) then
    print('sortie 1')
  	return str1
  end
  startindex, endindex = string.find(str1, string.sub(sought, 1, lensought), 1, true)
  -- Rejeter le cas où str2 est préfixé dans str1
  if (startindex > 1) then
    print('sortie 2')
  	return str1
  else
  	result = string.sub(str1, endindex+1)
    -- Cas spécial 'arts *' sous 'art' et 'sports *' sous 'sport'
    print('str2 >'..str2..'< result >'..result..'<')
    if ((str2 == 'art') or (str2 == 'sport')) and (string.find(result, 's ', 1, true) == 1) then
      result = string.sub(result, 3)
    end
    -- Cas inverse (par ex. 'art urbain' sous 'arts visuels', qui donne result ' urbain' ici)
    if string.sub(result, 1, 1) == ' ' then
      result = result.sub(result, 2)
    end
    -- On enlève enfin un éventuel préfixe en de/du/de la/des/d’/de l’/avec
  	if string.find(result, 'de la ', 1, true) == 1 then
  	  result = string.sub(result, 7)
  	-- Unicode rallonge '’' de 2 octets
  	elseif string.find(result, 'de l’', 1, true) == 1 then
  	  result = string.sub(result, 8)
  	elseif string.find(result, 'des ', 1, true) == 1 then
  	  result = string.sub(result, 5)
  	elseif string.find(result, 'avec ', 1, true) == 1 then
  	  result = string.sub(result, 6)
  	elseif string.find(result, 'de ', 1, true) == 1 then
  	  result = string.sub(result, 4)
  	elseif string.find(result, 'du ', 1, true) == 1 then
  	  result = string.sub(result, 4)
  	elseif string.find(result, 'd’', 1, true) == 1 then
  	  result = string.sub(result, 5)
  	end
  	return result
  end
end
print('>'..removecommonprefix('jeux de sport', 'jeux de simulation')..'<')

created 1 year ago

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About Lua

Lua is a light weight embeddable scripting language which is built on top of C. It is used in almost all kind of applications like games, web applications, mobile applications, image processing etc. It's a very powerful, fast, easy to learn, open-source scripting language.

Syntax help

Variables

By default all the variables declared are global variables
If the variables are explicitly mentioned as local then they are local variables.
Lua is a dynamically typed language and hence only the values will have types not the variables.

Examples

-- global variables
a = 10

-- local variables

local x = 30

Value Type	Description
number	Represents numbers
string	Represents text
nil	Differentiates values whether it has data or not
boolean	Value can be either true or false
function	Represents a sub-routine
userdata	Represents arbitary C data
thread	Represents independent threads of execution.
table	Can hold any value except nil

Loops

1. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while(condition)
do
--code
end

2. Repeat-Until:

Repeat-Until is also used to iterate a set of statements based on a condition. It is very similar to Do-While, it is mostly used when you need to execute the statements atleast once.

repeat
   --code
until( condition )

3. For:

For loop is used to iterate a set of statements based on a condition.

for init,max/min value, increment
do
   --code
end

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increase re-usuability and modularity.

optional_function_scope function function_name( argument1, argument2, argument3........, argumentn)
--code
return params with comma seperated
end