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Implement tryparse() #123

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merged 1 commit into from
May 13, 2020
Merged

Implement tryparse() #123

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9 changes: 9 additions & 0 deletions src/DecFP.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -214,6 +214,15 @@ for w in (32,64,128)
return @xchk(x, nothing)
end

function Base.tryparse(::Type{$BID}, s::AbstractString)
x = _parse($BID, s)
if isnan(x) && !isnanstr(s)
@xchk(x, nothing)
return nothing
end
return @xchk(x, nothing)
end

$BID(x::AbstractString) = parse($BID, x)

function $BID(x::AbstractString, mode::RoundingMode)
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6 changes: 6 additions & 0 deletions test/runtests.jl
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Expand Up @@ -47,6 +47,12 @@ for T in (Dec32, Dec64, Dec128)
@test isinf(parse(T, "inf")::T) && !isfinite(parse(T, "inf")::T)
@test parse(T,"inf")::T == typemax(T)::T
@test parse(T,"-inf")::T == typemin(T)::T
@test_throws ArgumentError parse(T, "1.0.1")
@test_throws ArgumentError parse(T, "NaNny")
@test tryparse(T, "1.5")::T == 1.5
@test isnan(tryparse(T, "NaN"))
@test tryparse(T, "NaNny") === nothing
@test tryparse(T, "1.0.1") === nothing

@test parse(T, "0.1")::T == T(1//10)
@test T("0.1")::T == T(1//10)
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