ADD: Error handling for UnicodeError (#347)

Adds Unicode Error message that informs user only UTF-8 and ASCII files
are supported, and to re-encode file into a supported format.

Adds unit test

Closes #328

src/io/common.jl

@@ -6,16 +6,22 @@ PowerModels data structure. All fields from PTI files will be imported if
 `import_all` is true (Default: false).
 """
 function parse_file(file::String; import_all=false)
-    if endswith(file, ".m")
-        pm_data = PowerModels.parse_matpower(file)
-    elseif endswith(lowercase(file), ".raw")
-        info(LOGGER, "The PSS(R)E parser currently supports buses, loads, shunts, generators, branches, transformers, and dc lines")
-        pm_data = PowerModels.parse_psse(file; import_all=import_all)
-    else
-        pm_data = parse_json(file)
-    end
+    try
+        if endswith(file, ".m")
+            pm_data = PowerModels.parse_matpower(file)
+        elseif endswith(lowercase(file), ".raw")
+            info(LOGGER, "The PSS(R)E parser currently supports buses, loads, shunts, generators, branches, transformers, and dc lines")
+            pm_data = PowerModels.parse_psse(file; import_all=import_all)
+        else
+            pm_data = parse_json(file)
+        end
 
-    return pm_data
+        return pm_data
+    catch e
+        if isa(e, UnicodeError)
+            error(LOGGER, "UnicodeError: PowerModels can only load UTF-8 or ASCII encoded files, re-encode \"$file\" to supported encoding")
+        end
+    end
 end
 
 

test/data/pti/parser_test_j.raw

@@ -0,0 +1,6 @@
+0,    100.00, 33, 0, 1, 60.00
+
+
+1002,,  345.0000, 2, 101, 201, 301,1.00000000,   0.000000, 1.10000, 0.90000, 1.10000, 0.90000
+1005,'         �  ',  87.0000, 2, 101, 201, 301,1.00000000,   3.000000, 1.10000, 0.90000, 1.10000, 0.90000
+Q

test/pti.jl

@@ -12,6 +12,7 @@ TESTLOG = getlogger(PowerModels)
                    PowerModels.parse_pti("../test/data/pti/parser_test_c.raw"))
         @test_throws(TESTLOG, ErrorException, PowerModels.parse_pti("../test/data/pti/parser_test_d.raw"))
         @test_warn(TESTLOG, "GNE DEVICE parsing is not supported.", PowerModels.parse_pti("../test/data/pti/parser_test_h.raw"))
+        @test_throws(TESTLOG, ErrorException, PowerModels.parse_file("../test/data/pti/parser_test_j.raw"))
 
         setlevel!(TESTLOG, "error")
     end