local ord = require('Module:Ordinal')
local utils = require('Module:Utils')
local rat = require('Module:Rational')
local p = {}
-- TODO: Add support for the following
-- - edc - equal divisions of a non-integer constant or cent value
-- Notes:
-- - Edo and edt are technically edh's, and edf an edr; these are their own
-- types because their intros have specific wording.
-- - Edh is a special case of edr, where the ratio is h/1.
-- - Under harmonotonic tuning, edc and edr are also called ASp and APSp
-- (ambitonal sequence and arithmetic pitch sequence, respectively). These
-- were formerly called equal-step tunings but were reclassified as 1ed.
-- - Equal divisions of irrational constants (such as pi and e) are not very
-- common, but count as equal divisions of arbitrary cent values.
-- Separate function for edo intro
function p.edo_intro(ed)
local ed = ed or 12
-- Exactly or about? Round to 3 DPs
local edstep_size = 1200 / ed
local edstep_size_rounded = utils._round(edstep_size, 3)
local is_exact = edstep_size - edstep_size_rounded == 0
local ordinal = ord._ordinal(ed)
local intro_text = ""
if ed == 1 then
intro_text = "'''1 equal division of the octave''' (abbreviated '''1edo''' or '''1ed2'''), also called '''1-tone equal temperament''' ('''1tet''') or '''1 equal temperament''' ('''1et''') when viewed under a [[regular temperament]] perspective, is the [[tuning system]] that uses [[equal]] steps of 2/1 (one [[octave]]), or exactly/about ''s'' [[¢]]."
else
intro_text = "'''''k'' equal divisions of the octave''' (abbreviated '''''k''edo''' or '''''k''ed2'''), also called '''''k''-tone equal temperament''' ('''''k''tet''') or '''''k'' equal temperament''' ('''''k''et''') when viewed under a [[regular temperament]] perspective, is the [[tuning system]] that divides the [[octave]] into ''k'' [[equal]] parts of exactly/about ''s'' [[¢]] each. Each step represents a [[frequency ratio]] of 2<sup>1/''k''</sup>, or the ''kth'' root of 2."
end
-- Replace certain strings with the intended final versions
intro_text = string.gsub(intro_text, "''k''", ed)
intro_text = string.gsub(intro_text, "exactly/about", (is_exact and "exactly" or "about"))
intro_text = string.gsub(intro_text, "''s''", string.format("%.3f", edstep_size))
intro_text = string.gsub(intro_text, "''kth''", ord._ordinal(ed))
return intro_text
end
-- Separate function for edt intro
function p.edt_intro(ed)
local ed = ed or 13
-- Exactly or about? Round to 3 DPs
local equave_in_cents = math.log(3) * 1200
local edstep_size = equave_in_cents / math.log(2) / ed
local edstep_size_rounded = utils._round(edstep_size, 3)
local is_exact = edstep_size - edstep_size_rounded == 0
local ordinal = ord._ordinal(ed)
local intro_text = ""
if ed == 1 then
intro_text = "'''1 equal division of the tritave''', '''perfect twelfth''', or '''3rd harmonic''' (abbreviated '''1edt''' or '''1ed3'''), is a [[nonoctave]] [[tuning system]] that uses [[equal]] steps of [[3/1]] (one tritave), or exactly/about ''s'' [[¢]]."
else
intro_text = "'''''k'' equal divisions of the tritave''', '''perfect twelfth''', or '''3rd harmonic''' (abbreviated '''''k''edt''' or '''''k''ed3'''), is a [[nonoctave]] [[tuning system]] that divides the interval of [[3/1]] into ''k'' [[equal]] parts of exactly/about ''s'' [[¢]] each. Each step represents a [[frequency ratio]] of 3<sup>1/''k''</sup>, or the ''kth'' root of 3."
end
-- Replace certain strings with the intended final versions
intro_text = string.gsub(intro_text, "''k''", ed)
intro_text = string.gsub(intro_text, "exactly/about", (is_exact and "exactly" or "about"))
intro_text = string.gsub(intro_text, "''s''", string.format("%.3f", edstep_size))
intro_text = string.gsub(intro_text, "''kth''", ord._ordinal(ed))
return intro_text
end
-- Separate function for edf intro
function p.edf_intro(ed)
local ed = ed or 7
-- Exactly or about? Round to 3 DPs
local equave_in_cents = math.log(3/2) * 1200
local edstep_size = equave_in_cents / math.log(2) / ed
local edstep_size_rounded = utils._round(edstep_size, 3)
local is_exact = edstep_size - edstep_size_rounded == 0
local ordinal = ord._ordinal(ed)
local intro_text = ""
if ed == 1 then
intro_text = "'''1 equal division of the perfect fifth''' (abbreviated '''1edf''' or '''1ed3/2''') is a [[nonoctave]] [[tuning system]] that uses [[equal]] steps of [[3/2]] (one perfect fifth), or exactly/about ''s'' [[¢]]."
else
intro_text = "'''''k'' equal divisions of the perfect fifth''' (abbreviated '''''k''edf''' or '''''k''ed3/2''') is a [[nonoctave]] [[tuning system]] that divides the interval of [[3/2]] into ''k'' [[equal]] parts of exactly/about ''s'' [[¢]] each. Each step represents a [[frequency ratio]] of (3/2)<sup>1/''k''</sup>, or the ''kth'' root of 3/2."
end
-- Replace certain strings with the intended final versions
intro_text = string.gsub(intro_text, "''k''", ed)
intro_text = string.gsub(intro_text, "exactly/about", (is_exact and "exactly" or "about"))
intro_text = string.gsub(intro_text, "''s''", string.format("%.3f", edstep_size))
intro_text = string.gsub(intro_text, "''kth''", ord._ordinal(ed))
return intro_text
end
-- Separate function for edh intro (arbitrary harmonic)
function p.edh_intro(ed, harmonic)
local ed = ed or 12
local harmonic = harmonic or 4
-- Exactly or about? Round to 3 DPs
local equave_in_cents = math.log(harmonic) * 1200
local edstep_size = equave_in_cents / math.log(2) / ed
local edstep_size_rounded = utils._round(edstep_size, 3)
local is_exact = edstep_size - edstep_size_rounded == 0
local ordinal = ord._ordinal(ed)
local intro_text = ""
if ed == 1 then
intro_text = "'''1 equal division of the hth harmonic''' (abbreviated '''1ed''h''''') is a [[nonoctave]] [[tuning system]] that uses [[equal]] steps of [[''h''/1]], or exactly/about ''s'' [[¢]]."
else
intro_text = "'''''k'' equal divisions of the hth harmonic''' (abbreviated '''''k''ed''h''''') is a [[nonoctave]] [[tuning system]] that divides the interval of [[''h''/1]] into ''k'' [[equal]] parts of exactly/about ''s'' [[¢]] each. Each step represents a [[frequency ratio]] of ''h''<sup>1/''k''</sup>, or the ''kth'' root of ''h''."
end
-- Replace certain strings with the intended final versions
intro_text = string.gsub(intro_text, "''k''", ed)
intro_text = string.gsub(intro_text, "exactly/about", (is_exact and "exactly" or "about"))
intro_text = string.gsub(intro_text, "''s''", string.format("%.3f", edstep_size))
intro_text = string.gsub(intro_text, "''kth''", ord._ordinal(ed))
intro_text = string.gsub(intro_text, "hth", ord._ordinal(harmonic))
intro_text = string.gsub(intro_text, "''h''", harmonic)
return intro_text
end
-- Separate function for edr intro (arbitrary ratio)
function p.edr_intro(ed, ratio)
local ed = ed or 12
local ratio = ratio or rat.new(9,4)
-- Exactly or about? Round to 3 DPs
local equave_in_cents = rat.cents(ratio)
local edstep_size = equave_in_cents / ed
local edstep_size_rounded = utils._round(edstep_size, 3)
local is_exact = edstep_size - edstep_size_rounded == 0
local ordinal = ord._ordinal(ed)
local intro_text = ""
if ed == 1 then
intro_text = "'''1 equal division of ''p/q''''' (abbreviated '''1ed''p/q''''') is a [[nonoctave]] [[tuning system]] that uses [[equal]] steps of [[''p/q'']], or exactly/about ''s'' [[¢]]."
else
intro_text = "'''''k'' equal divisions of ''p/q''''' (abbreviated '''''k''ed''p/q''''') is a [[nonoctave]] [[tuning system]] that divides the interval of [[''p/q'']] into ''k'' [[equal]] parts of exactly/about ''s'' [[¢]] each. Each step represents a [[frequency ratio]] of (''p/q'')<sup>1/''k''</sup>, or the ''kth'' root of ''p/q''."
end
-- Replace certain strings with the intended final versions
intro_text = string.gsub(intro_text, "''k''", ed)
intro_text = string.gsub(intro_text, "exactly/about", (is_exact and "exactly" or "about"))
intro_text = string.gsub(intro_text, "''s''", string.format("%.3f", edstep_size))
intro_text = string.gsub(intro_text, "''kth''", ord._ordinal(ed))
intro_text = string.gsub(intro_text, "''p/q''", rat.as_ratio(ratio))
return intro_text
end
-- Separate function for edc (arbitrary cent value)
function p.edcent_intro(ed, cents)
local ed = ed or 1
local cents = cents or 97.5
-- Exactly or about? Round to 3 DPs
local edstep_size = cents / ed
local edstep_size_rounded = utils._round(edstep_size, 3)
local is_exact = edstep_size - edstep_size_rounded == 0
local ordinal = ord._ordinal(ed)
local intro_text = ""
if ed == 1 then
intro_text = "'''1 equal division of ''c''¢''' (abbreviated '''1ed''c''¢''') is a [[nonoctave]] [[tuning system]] that uses [[equal]] steps of ''c'' [[¢]]."
else
intro_text = "'''''k'' equal divisions of ''c''¢''' (abbreviated '''''k''ed''c''¢''') is a [[nonoctave]] [[tuning system]] that divides the interval of ''c''¢ into ''k'' [[equal]] parts of exactly/about ''s'' [[¢]] each."
end
-- Replace certain strings with the intended final versions
intro_text = string.gsub(intro_text, "''k''", ed)
intro_text = string.gsub(intro_text, "exactly/about", (is_exact and "exactly" or "about"))
intro_text = string.gsub(intro_text, "''s''", string.format("%.3f", edstep_size))
intro_text = string.gsub(intro_text, "''c''", cents)
return intro_text
end
-- Parse function
function p.parse(unparsed)
local unparsed = unparsed or "12"
-- If the unparsed ed is only a numeric value, default to edo
if tonumber(unparsed) ~= nil then
unparsed = unparsed .. "edo"
end
-- Parse the step count, the suffix, and the equave
local steps, equave = unparsed:match('^(%d+)[Ee][Dd](.+)$')
-- Determine if the ed is for a cent value
local is_cents = string.match(equave, '%d*%.?%d+[Cc¢]$') ~= nil
-- Parse equave
local parsed_equave
if equave == "o" or equave == "O" or equave == "2" or equave == "2/1" then
-- Equave is octave
parsed_equave = 2
elseif equave == "t" or equave == "T" or equave == "3" or equave == "3/1" then
-- Equave is tritave/twelfth
parsed_equave = 3
elseif equave == "f" or equave == "F" or equave == "3/2" then
-- Equave is fifth
parsed_equave = rat.new(3,2)
elseif string.match(equave, '^%d+$') ~= nil then
-- Equave is arbitrary harmonic (not 2/1 or 3/1)
parsed_equave = tonumber(equave)
elseif string.match(equave, '^%d+/%d+$') ~= nil then
-- Equave is arbitrary ratio (not 3/2)
local num, den = equave:match('^(%d+)/(%d+)$')
parsed_equave = rat.new(tonumber(num), tonumber(den))
elseif is_cents then
-- Equave is arbitrary cent value
parsed_equave = tonumber(equave:match('^(%d*%.?%d+)[Cc¢]$'))
else
-- Equave is unsupported
parsed_equave = 0
end
return tonumber(steps), parsed_equave, is_cents
end
-- Primary function
function p._ed_intro(ed)
local ed = ed or "12"
local parsed_ed, parsed_equave, is_cent_value = p.parse(ed)
if rat.eq(0, parsed_equave) then
return "Equave not supported."
elseif rat.eq(2, parsed_equave) then
return p.edo_intro(parsed_ed)
elseif rat.eq(3, parsed_equave) then
return p.edt_intro(parsed_ed)
elseif rat.eq(rat.new(3,2), parsed_equave) then
return p.edf_intro(parsed_ed)
elseif rat.is_harmonic(parsed_equave) and not is_cent_value then
return p.edh_intro(parsed_ed, parsed_equave)
elseif not rat.is_harmonic(parsed_equave) then
return p.edr_intro(parsed_ed, parsed_equave)
elseif is_cent_value then
return p.edcent_intro(parsed_ed, parsed_equave)
else
return "Invalid input."
end
end
-- Wrapper function; for use with a template
function p.ed_intro(frame)
local ed = frame.args['ED']
local edo = frame.args['EDO'] -- For backwards compatibility with edo intro
if edo ~= nil then
return p._ed_intro(edo)
else
return p._ed_intro(ed)
end
end
return p
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