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1 """ Error handling routines """
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2
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3 class CompilerException(Exception):
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4 def __init__(self, msg, row=0, col=0):
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5 self.msg = msg
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6 self.row = row
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7 self.col = col
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8 def __repr__(self):
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9 return self.msg
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10 def __str__(self):
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11 return self.msg
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12
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13 def Error(msg, node=None):
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14 if node is None:
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15 raise CompilerException(msg)
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16 else:
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17 raise CompilerException(msg, node.row, node.col)
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18
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19 def printError(source, e):
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20 def printLine(row, txt):
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21 print(str(row)+':'+txt)
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22 if e.row == 0:
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23 print('Error: {0}'.format(e.msg))
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24 else:
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25 lines = source.split('\n')
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26 prerow = e.row - 3
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27 if prerow < 1:
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28 prerow = 1
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29 afterrow = e.row + 3
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30 if afterrow > len(lines):
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31 afterrow = len(lines)
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32
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33 # print preceding source lines:
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34 for r in range(prerow, e.row):
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35 printLine(r, lines[r-1])
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36 # print source line containing error:
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37 printLine(e.row, lines[e.row-1])
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38 print(' '*(len(str(e.row)+':')+e.col-1) + '^ Error: {0}'.format(e.msg))
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39 # print trailing source line:
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40 for r in range(e.row+1, afterrow+1):
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41 printLine(r, lines[r-1])
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