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Finds the length of an array or of a quasi-array with keys with an optional prefix such as "data1", "data2", etc. It uses an exponential search algorithm to find the length, so as to use as few table lookups as possible. This algorithm is useful for arrays that use metatables (e.g. frame.args) and for quasi-arrays.
The module itself must return a Lua table of values. A Lua table is expressed as a list of values separated by commas, within curly braces. When the module is called by #invoke, the function it names (the first argument after |) is looked for in that table. That function, in turn, is expected to return something that can be represented as a string.
Lua can process text strings in excess of 230,000 characters, which allows the formatted contents of article pages to be used as input to string searches. However, there have been some limitations in string contents, such as hidden strings enclosed in nowiki-tag or pre-tag elements.
and trying to use a plus-sign "+" might pass during the pre-compile of edit-save but hit "Script error" when that portion of the Lua script is executed. Invalid function name: len = string.long(my_str) - The string-length operator is hash mark '#' (as in: #my_str), or use function 'string.len(my_str)' but trying to use unknown function 'string ...
2 Lua text problems of wikitables and nowiki tags. 2 comments. Toggle the table of contents. Wikipedia talk: Lua string functions. Add languages. Page contents not ...
To call a Lua function, arguments are pushed onto the stack, and then the lua_call is used to call the actual function. When writing a C function to be directly called from Lua, the arguments are read from the stack. Here is an example of calling a Lua function from C:
A free open source tool to convert from CSV and Excel files to wiki table format: csv2other; Spreadsheet-to-MediaWiki-table-Converter This class constructs a MediaWiki-format table from an Excel/GoogleDoc copy & paste. It provides a variety of methods to modify the style.
The use of metatables also has its downsides. Most of the normal Lua table tools won't work properly on the args table, including the # operator, the next() function, and the functions in the table library. If using these is important for your module, you should use your own argument processing function instead of this module.