diff options
Diffstat (limited to 'lualibs-util-str.lua')
| -rw-r--r-- | lualibs-util-str.lua | 45 |
1 files changed, 44 insertions, 1 deletions
diff --git a/lualibs-util-str.lua b/lualibs-util-str.lua index 295fc00..09fa26f 100644 --- a/lualibs-util-str.lua +++ b/lualibs-util-str.lua @@ -264,6 +264,33 @@ function number.signed(i) end end +local zero = P("0")^1 / "" +local plus = P("+") / "" +local minus = P("-") +local separator = S(".") +local digit = R("09") +local trailing = zero^1 * #S("eE") +local exponent = (S("eE") * (plus + Cs((minus * zero^0 * P(-1))/"") + minus) * zero^0 * (P(-1) * Cc("0") + P(1)^1)) +local pattern_a = Cs(minus^0 * digit^1 * (separator/"" * trailing + separator * (trailing + digit)^0) * exponent) +local pattern_b = Cs((exponent + P(1))^0) + +function number.sparseexponent(f,n) + if not n then + n = f + f = "%e" + end + local tn = type(n) + if tn == "string" then -- cast to number + local m = tonumber(n) + if m then + return lpegmatch((f == "%e" or f == "%E") and pattern_a or pattern_b,format(f,m)) + end + elseif tn == "number" then + return lpegmatch((f == "%e" or f == "%E") and pattern_a or pattern_b,format(f,n)) + end + return tostring(n) +end + local preamble = [[ local type = type local tostring = tostring @@ -282,6 +309,7 @@ local autosingle = string.autosingle local autodouble = string.autodouble local sequenced = table.sequenced local formattednumber = number.formatted +local sparseexponent = number.sparseexponent ]] local template = [[ @@ -376,6 +404,16 @@ local format_E = function(f) return format("format('%%%sE',a%s)",f,n) end +local format_j = function(f) + n = n + 1 + return format("sparseexponent('%%%se',a%s)",f,n) +end + +local format_J = function(f) + n = n + 1 + return format("sparseexponent('%%%sE',a%s)",f,n) +end + local format_x = function(f) n = n + 1 return format("format('%%%sx',a%s)",f,n) @@ -602,6 +640,8 @@ local format_extension = function(extensions,f,name) end end +-- aA b cC d eE f gG hH iI jJ lL mM N o p qQ r sS tT uU wW xX + local builder = Cs { "start", start = ( ( @@ -625,11 +665,11 @@ local builder = Cs { "start", + V("t") + V("T") + V("l") + V("L") + V("I") - + V("h") -- new + V("w") -- new + V("W") -- new + V("a") -- new + V("A") -- new + + V("j") + V("J") -- stripped e E + V("m") + V("M") -- new -- + V("*") -- ignores probably messed up % @@ -674,6 +714,9 @@ local builder = Cs { "start", ["w"] = (prefix_any * P("w")) / format_w, -- %w => n spaces (optional prefix is added) ["W"] = (prefix_any * P("W")) / format_W, -- %W => mandate prefix, no specifier -- + ["j"] = (prefix_any * P("j")) / format_j, -- %j => %e (float) stripped exponent (irrational) + ["J"] = (prefix_any * P("J")) / format_J, -- %J => %E (float) stripped exponent (irrational) + -- ["m"] = (prefix_tab * P("m")) / format_m, -- %m => xxx.xxx.xxx,xx (optional prefix instead of .) ["M"] = (prefix_tab * P("M")) / format_M, -- %M => xxx,xxx,xxx.xx (optional prefix instead of ,) -- |