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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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194
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6 from . import SourceLocation
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7
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152
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8 class CompilerError(Exception):
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200
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9 def __init__(self, msg, loc=None):
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191
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10 self.msg = msg
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11 self.loc = loc
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200
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12 if loc:
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13 assert type(loc) is SourceLocation, '{0} must be SourceLocation'.format(type(loc))
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215
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14 self.row = loc.row
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15 self.col = loc.col
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16 else:
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17 self.row = self.col = None
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18
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191
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19 def __repr__(self):
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215
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20 if self.row:
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21 return 'Compilererror: "{0}" at row {1}'.format(self.msg, self.row)
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200
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22 else:
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23 return 'Compilererror: "{0}"'.format(self.msg)
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1
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24
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25 def printError(source, e):
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26 def printLine(row, txt):
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27 print(str(row)+':'+txt)
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148
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28 if e.loc.row == 0:
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1
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29 print('Error: {0}'.format(e.msg))
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30 else:
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31 lines = source.split('\n')
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215
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32 ro, co = e.row, e.col
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148
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33 prerow = ro - 2
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1
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34 if prerow < 1:
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35 prerow = 1
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148
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36 afterrow = ro + 3
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1
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37 if afterrow > len(lines):
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38 afterrow = len(lines)
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39
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40 # print preceding source lines:
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148
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41 for r in range(prerow, ro):
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1
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42 printLine(r, lines[r-1])
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43 # print source line containing error:
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148
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44 printLine(ro, lines[ro-1])
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45 print(' '*(len(str(ro)+':')+co-1) + '^ Error: {0}'.format(e.msg))
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1
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46 # print trailing source line:
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148
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47 for r in range(ro+1, afterrow+1):
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1
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48 printLine(r, lines[r-1])
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148
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49
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152
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50 class DiagnosticsManager:
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225
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51 def __init__(self):
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248
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52 self.diags = []
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215
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53
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225
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54 def addDiag(self, d):
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248
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55 self.diags.append(d)
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215
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56
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225
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57 def error(self, msg, loc):
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248
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58 self.addDiag(CompilerError(msg, loc))
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215
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59
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225
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60 def clear(self):
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248
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61 del self.diags[:]
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215
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62
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225
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63 def printErrors(self, src):
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64 if len(self.diags) > 0:
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65 print('==============')
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66 print('{0} Errors'.format(len(self.diags)))
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67 for d in self.diags:
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68 print('==============')
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69 printError(src, d)
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70 print('==============')
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148
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71
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