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104 lines
2.3 KiB
Lua
104 lines
2.3 KiB
Lua
-- See nmaps COPYING for license
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module(... or "tab" ,package.seeall)
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--[[ Provide NSE scripts with a way to output structured tables similar to
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NmapOutputTable.cc. See end for an example on how to use it. --]]
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require('strbuf')
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--[[ Create and return a new table with a number of columns equal to col and
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the row counter set to 1 --]]
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function new(cols)
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assert(cols > 0)
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local table ={}
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table['cols'] = cols
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table['rows'] = 1
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setmetatable(table, {__tostring=dump})
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return table
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end
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--[[ Add a new string item (v) in a previously initialised table (t)
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at column position 'c'. The data will be added to the current
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row, if nextrow() hasn't been called yet that will be row 1 --]]
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function add(t, c, v)
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assert(t)
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assert(v)
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assert(t['rows'])
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assert(t['cols'])
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assert(type(v) == "string")
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if c < 1 or c > t['cols'] then
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return false
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end
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-- add a new row if one doesn't exist
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if t[t['rows']] == nil then
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t[t['rows']] = {}
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end
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t[t['rows']][c] = v
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return true
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end
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--[[ Move on to the next row in the table. If this is not called
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then previous column values will be over-written by subsequent
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values. --]]
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function nextrow(t)
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assert(t)
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assert(t['rows'])
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t['rows'] = t['rows'] + 1
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end
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--[[ Once items have been added to a table, call this to return a
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string which contains an equally spaced table. Number of spaces
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is based on the largest element of a column with an additional
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two spaces for padding --]]
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function dump(t)
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assert(t)
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assert(t['rows'])
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assert(t['cols'])
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local col_len = {}
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local table = strbuf.new()
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local len
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-- find largest string in column
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for i=1, t['cols'] do
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local max = 0
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for x=1, t['rows'] do
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if t[x] == nil then t[x] = {} end
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if t[x][i] ~= nil and string.len(t[x][i]) > max then
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max = string.len(t[x][i])
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end
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end
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col_len[i] = max+2
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end
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-- build table with padding so all column elements line up
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for i=1,t['rows'] do
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for x=1, t['cols'] do
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if t[i][x] ~= nil then
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length = string.len(t[i][x])
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table = table .. t[i][x]
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table = table .. string.rep(' ', col_len[x]-length)
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end
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end
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table = table .. "\n"
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end
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return strbuf.dump(table)
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end
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--[[ Example Usage
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local t = tab.new(2)
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tab.add(t, 1, 'A1')
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tab.add(t, 2, 'A2')
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tab.nextrow(t)
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tab.add(t, 1, 'BBBBBBBBB1')
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tab.add(t, 2, 'BBB2')
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tab.dump(t)
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--]]
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