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calculate temp in one step #48

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Merged
merged 2 commits into from
Mar 24, 2024
Merged

calculate temp in one step #48

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fc9780e
calculate temp in one step
lawson89 Mar 24, 2024
02e6201
Merge branch 'gcarreno:main' into main
lawson89 Mar 24, 2024
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19 changes: 11 additions & 8 deletions entries/rlawson/src/parser.pas
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Original file line number Diff line number Diff line change
Expand Up @@ -29,7 +29,6 @@ implementation
BUFFER_SIZE = READ_SIZE + 1024;
REC_SEP: char = ';';
LF: char = chr(10);
ANSI_ZERO: integer = 48;
DECIMAL_POINT: char = '.';
NEGATIVE_SIGN: char = '-';

Expand All @@ -47,6 +46,7 @@ procedure ProcessMeasurements(var buffer: array of char; bufferLength: integer;
// read the city by looking for semicolon
city := '';
cityStart := idx;
Inc(idx); // city has to be at least one character
while buffer[idx] <> REC_SEP do Inc(idx);
SetString(city, @buffer[cityStart], (idx - cityStart));
// parse the temp reading
Expand All @@ -58,17 +58,20 @@ procedure ProcessMeasurements(var buffer: array of char; bufferLength: integer;
currentTempSign := -1;
Inc(idx);
end;
// look ahead - is decimal point 2 spaces away then we have two digits
// look ahead - is decimal point 2 spaces away then we have temp = dd.d
// other wise d.d
temp := 0;
if buffer[idx + 2] = DECIMAL_POINT then
begin
temp := 100 * (byte(buffer[idx]) - ANSI_ZERO);
Inc(idx);
temp := currentTempSign * (100 * Integer(buffer[idx]) + 10 *
Integer(buffer[idx + 1]) + Integer(buffer[idx + 3]) - 5328);
idx := idx + 6;
end
else
begin
temp := currentTempSign * (10 * Integer(buffer[idx]) + Integer(buffer[idx + 2]) - 528);
idx := idx + 5;
end;
temp := temp + 10 * (byte(buffer[idx]) - ANSI_ZERO);
idx := idx + 2;
temp := currentTempSign * (temp + (byte(buffer[idx]) - ANSI_ZERO));
idx := idx + 3;
reading := results.Find(city);
if reading = nil then
begin
Expand Down