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148
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1 """
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2 Error handling routines
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3 Diagnostic utils
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4 """
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5
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152
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6 class CompilerError(Exception):
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148
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7 def __init__(self, msg, loc):
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1
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8 self.msg = msg
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148
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9 self.loc = loc
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1
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10 def __repr__(self):
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152
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11 return 'Compilererror {0} at {1}'.format(self.msg, self.loc)
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1
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12
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13 def printError(source, e):
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14 def printLine(row, txt):
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15 print(str(row)+':'+txt)
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148
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16 if e.loc.row == 0:
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1
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17 print('Error: {0}'.format(e.msg))
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18 else:
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19 lines = source.split('\n')
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148
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20 ro, co = e.loc.row, e.loc.col
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21 prerow = ro - 2
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1
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22 if prerow < 1:
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23 prerow = 1
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148
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24 afterrow = ro + 3
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1
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25 if afterrow > len(lines):
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26 afterrow = len(lines)
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27
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28 # print preceding source lines:
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148
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29 for r in range(prerow, ro):
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1
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30 printLine(r, lines[r-1])
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31 # print source line containing error:
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148
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32 printLine(ro, lines[ro-1])
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33 print(' '*(len(str(ro)+':')+co-1) + '^ Error: {0}'.format(e.msg))
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1
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34 # print trailing source line:
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148
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35 for r in range(ro+1, afterrow+1):
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1
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36 printLine(r, lines[r-1])
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148
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37
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152
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38 class DiagnosticsManager:
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148
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39 def __init__(self):
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40 self.diags = []
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152
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41 def addDiag(self, d):
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148
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42 self.diags.append(d)
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152
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43 def error(self, msg, loc):
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44 self.addDiag(CompilerError(msg, loc))
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148
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45
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