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view framework/env/param/iterate.lua @ 567:5e3ebe9fd0ce

Added tag v2.2.1 for changeset 3b71fdb3a00d
author jbe
date Wed Apr 28 13:07:52 2021 +0200 (2 months ago)
parents 9fdfb27f8e67
children
line source
1 --[[--
2 for
3 index, -- index variable counting up from 1
4 prefix -- prefix string with index in square brackets to be used as a prefix for a key passed to param.get or param.get_list
5 in
6 param.iterate(
7 prefix -- prefix to be followed by an index in square brackets and another key
8 )
9 do
10 ...
11 end
13 This function returns an interator function to be used in a for loop. The CGI GET/POST parameter (or internal parameter) with the name "prefix[len]" is read, where 'prefix' is the prefix passed as the argument and 'len' ist just the literal string "len". For each index from 1 to the read length the returned iterator function returns the index and a string consisting of the given prefix followed by the index in square brackets to be used as a prefix for keys passed to param.get(...) or param.get_list(...).
15 --]]--
17 function param.iterate(prefix)
18 local length = param.get(prefix .. "[len]", atom.integer) or 0
19 if not atom.is_integer(length) then
20 error("List length is not a valid integer or nil.")
21 end
22 local index = 0
23 return function()
24 index = index + 1
25 if index <= length then
26 return index, prefix .. "[" .. index .. "]"
27 end
28 end
29 end

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