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