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Task/Text-processing-2/Nim/text-processing-2.nim

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+import strutils, tables
+
+const NumFields = 49
+const DateField = 0
+const FlagGoodValue = 1
+
+var badRecords: int # the number of records that have invalid formatted values
+var totalRecords: int # the total number of records in the file
+var badInstruments: int   # the total number of records that have at least one instrument showing error
+var seenDates = newTable[string,bool]() # table that keeps track of what dates we have seen
+
+# ensure we can parse all records as floats (except the date stamp)
+proc checkFloats(floats:seq[string]): bool =
+  for index in 1..NumFields-1:
+    try:
+      # we're assuming all instrument flags are floats not integers
+      discard parseFloat(floats[index])
+    except ValueError:
+      return false
+  true
+
+# ensure that all sensor flags are ok
+proc areAllFlagsOk(instruments: seq[string]): bool =
+  #flags start at index 2, and occur every 2 fields
+  for index in countup(2,NumFields,2):
+    # we're assuming all instrument flags are floats not integers
+    var flag = parseFloat(instruments[index])
+    if flag < FlagGoodValue: return false
+  true
+
+
+# Note: we're not checking the format of the date stamp
+
+# main
+var lines = readFile("readings.txt")
+var currentLine: int
+
+for line in lines.splitLines:
+  currentLine.inc
+  #empty lines don't count as records
+  if line.len == 0: continue
+
+  var tokens = line.split({' ','\t'})
+
+  totalRecords.inc
+
+  if tokens.len != NumFields:
+    badRecords.inc
+    continue
+
+  if not checkFloats(tokens):
+    badRecords.inc
+    continue
+
+  if not areAllFlagsOk(tokens):
+    badInstruments.inc
+
+  if seenDates.hasKeyOrPut(tokens[DateField], true):
+    echo tokens[DateField], " duplicated on line ", currentLine
+
+var goodRecords = totalRecords - badRecords
+var goodInstruments = goodRecords - badInstruments
+
+echo "Total Records:", totalRecords
+echo "Good Records:", goodRecords
+echo "Records where all instuments were OK:", goodInstruments