Module for searching and manipulating wikitables.
-- Table constructor
local p = {}
local function delimiterPositions(wikitable, delimiter)
-- Gets the positions and number of instances of a delimiter in a table's wikitext. By "position", we mean that, for example, the letter "e" in "hello" is in position 2, and the pattern "ll" in "hello" is in position 3.
local positions = {}
local index = 1
for pos = 1, string.len(wikitable) - 1 do
if string.sub(wikitable, pos, pos + 1) == delimiter then
positions[index] = pos
index = index + 1
end
end
positions[index] = string.len(wikitable) - 1
return {positions, index - 1}
end
local function rowPositions(wikitable)
-- Gets the positions of instances of the row delimiter |- in a table's wikitext.
return delimiterPositions(wikitable, "|-")[1]
end
local function rows(wikitable)
-- Gets the number of rows in a table's wikitext.
return delimiterPositions(wikitable, "|-")[2]
end
local function fetchRows(wikitable, firstRow, lastRow)
-- Gets the contents of the rows between firstRow and lastRow inclusively. For example, fetchRows(wikitable, 3, 7) returns rows 3, 4, 5, 6, and 7 of the table.
local rowP = rowPositions(wikitable)
return string.sub(wikitable, rowP[firstRow], rowP[lastRow + 1])
end
local function fetchOneRow(wikitable, row)
-- Gets the contents of a single row.
return fetchRows(wikitable, row, row)
end
local function columns(wikitable)
-- Gets the names of the columns.
names = {}
posTable = delimiterPositions(wikitable, "!", "|-")
for n = 1, posTable[2] do
names[n] = string.sub(wikitable, posTable[1][n] + 1, posTable[1][n + 1] - 1)
end
return names
end
function p.partialTable(frame)
local wikitable = frame.args[1]
local rowP = rowPositions(wikitable)
local length = rows(wikitable)
local firstRow = math.max(frame.args[2], 1) or 1
local lastRow = math.min(frame.args[3], length) or length
local header = string.sub(wikitable, 1, rowP[1] - 1)
local body = fetchRows(wikitable, firstRow, lastRow)
return header .. body .. "}"
end
return p
--[[Category:Modules]]