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-- Module for searching and manipulating wikitables.
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-- Table constructor
   
 
local p = {}
 
local p = {}
   
local function delimiterPositions(wikitable, delimiter, ender)
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local function rowPositions(wikitable)
-- 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 positions = {}
 
local index = 1
 
local index = 1
local pos = 1
 
   
 
for pos = 1, string.len(wikitable) - 1 do
 
for pos = 1, string.len(wikitable) - 1 do
if string.find(wikitable, delimiter, pos) then
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if string.sub(wikitable, pos, pos + 1) == "|-" then
positions[index], pos = string.find(wikitable, delimiter, pos)
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positions[index] = pos
 
index = index + 1
 
index = index + 1
elseif string.find(wikitable, ender, pos) then
 
positions[index], _ = string.find(wikitable, ender, pos)
 
break
 
 
end
 
end
 
end
 
end
  +
  +
positions[index] = string.len(wikitable) - 1
   
 
return {positions, index - 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
 
end
   
 
local function fetchRows(wikitable, firstRow, lastRow)
 
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.
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local rowP = rowPositions(wikitable)[1]
local rowP = rowPositions(wikitable)
 
 
return string.sub(wikitable, rowP[firstRow], rowP[lastRow + 1])
 
return string.sub(wikitable, rowP[firstRow], rowP[lastRow + 1])
 
end
 
end
   
 
local function fetchOneRow(wikitable, row)
 
local function fetchOneRow(wikitable, row)
-- Gets the contents of a single row.
 
 
return fetchRows(wikitable, row, 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
 
end
   
 
function p.partialTable(frame)
 
function p.partialTable(frame)
-- Constructs a subtable of the given table containing the specified rows. For example, {{#invoke:table|partialTable|(table)|3|7}} produces a table using rows 3-7 of the original table.
 
 
local wikitable = frame.args[1]
 
local wikitable = frame.args[1]
local rowP = rowPositions(wikitable)
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local rowP = rowPositions(wikitable)[1]
local length = rows(wikitable)
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local length = rowPositions(wikitable)[2]
 
local firstRow = math.max(frame.args[2], 1) or 1
 
local firstRow = math.max(frame.args[2], 1) or 1
 
local lastRow = math.min(frame.args[3], length) or length
 
local lastRow = math.min(frame.args[3], length) or length

Revision as of 04:54, February 13, 2020

-- Table constructor
 
local p = {}
 
local function rowPositions(wikitable)
    local positions = {}
    local index = 1
 
    for pos = 1, string.len(wikitable) - 1 do
        if string.sub(wikitable, pos, pos + 1) == "|-" then
            positions[index] = pos
            index = index + 1
        end
    end
 
    positions[index] = string.len(wikitable) - 1
 
    return {positions, index - 1}
end
 
local function fetchRows(wikitable, firstRow, lastRow)
    local rowP = rowPositions(wikitable)[1]
    return string.sub(wikitable, rowP[firstRow], rowP[lastRow + 1])
end
 
local function fetchOneRow(wikitable, row)
    return fetchRows(wikitable, row, row)
end
 
function p.partialTable(frame)
    local wikitable = frame.args[1]
    local rowP = rowPositions(wikitable)[1]
    local length = rowPositions(wikitable)[2]
    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]]
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