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Implement error handling for EPSG code parsing #123

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Implement error handling for EPSG code parsing #123

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b1bbc94
Implement error handling for EPSG code parsing
asinghvi17 Oct 20, 2025
2bab1f7
Add test for EPSG error handling
asinghvi17 Oct 20, 2025
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3 changes: 3 additions & 0 deletions src/crs.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -133,6 +133,9 @@ end

function GFT.EPSG(crs::CRS)
str = proj_get_id_code(crs)
if isnothing(str)
error("Could not parse $crs to EPSG code; it probably does not correspond to one.")
end
code = parse(Int, str)
return GFT.EPSG(code)
end
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4 changes: 4 additions & 0 deletions test/libproj.jl
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Expand Up @@ -489,6 +489,10 @@ end
@test GFT.EPSG(crs) == GFT.EPSG("EPSG:4326")

@test convert(GFT.EPSG, crs) == GFT.EPSG("EPSG:4326")

# Test error handling when CRS doesn't have an EPSG code
crs_without_epsg = Proj.CRS("+proj=merc +lat_ts=56.5 +ellps=GRS80 +type=crs")
@test_throws r"Could not parse.*EPSG code"is GFT.EPSG(crs_without_epsg)
@test convert(GFT.WellKnownText2, crs) == GFT.WellKnownText2(crs)
@test Proj.proj_get_id_code(convert(Proj.CRS, GFT.EPSG("EPSG:4326"))) ==
Proj.proj_get_id_code(crs)
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