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1 | # Copyright 2013 Chris Johns (chrisj@rtems.org) |
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2 | # |
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3 | # This file's license is 2-clause BSD as in this distribution's LICENSE.2 file. |
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4 | # |
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5 | |
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6 | # |
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7 | # Pkg-config in python. Pkg-config as a tool is a good idea how-ever the |
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8 | # implementation is really Linux (or Unix) based and requires a couple of |
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9 | # packages that it should not. If it was implemented with all parts included it |
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10 | # would be portable and I suspect useful to others on platforms other than |
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11 | # Linux or Unix equivs that contain the required packages. |
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12 | # |
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13 | import re |
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14 | |
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15 | class error(Exception): |
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16 | def __init__(self, msg): |
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17 | self.msg = msg |
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18 | |
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19 | def __str__(self): |
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20 | return self.msg |
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21 | |
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22 | class package: |
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23 | def __init__(self, file = None): |
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24 | self.defines = {} |
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25 | self.fields = {} |
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26 | if file: |
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27 | self.load(file) |
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28 | |
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29 | def load(self, file): |
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30 | f = open(file) |
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31 | tm = False |
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32 | for l in f.readlines(): |
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33 | l = l[:-1] |
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34 | hash = l.find('#') |
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35 | if hash >= 0: |
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36 | l = l[:hash] |
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37 | if len(l): |
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38 | d = 0 |
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39 | define = False |
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40 | eq = l.find('=') |
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41 | dd = l.find(':') |
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42 | if eq > 0 and dd > 0: |
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43 | if eq < dd: |
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44 | define = True |
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45 | d = eq |
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46 | else: |
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47 | define = False |
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48 | d = dd |
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49 | elif eq >= 0: |
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50 | define = True |
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51 | d = eq |
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52 | elif dd >= 0: |
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53 | define = False |
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54 | d = dd |
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55 | if d > 0: |
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56 | lhs = l[:d].lower() |
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57 | rhs = l[d + 1:] |
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58 | |
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59 | if tm: |
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60 | print('define: ' + str(define) + ', lhs: ' + lhs + ', ' + rhs) |
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61 | |
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62 | if define: |
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63 | self.defines[lhs] = rhs |
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64 | else: |
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65 | self.fields[lhs] = rhs |
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66 | |
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67 | def get(self, label): |
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68 | if label.lower() not in self.fields: |
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69 | raise error('Label not found: ' + label) |
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70 | mre = re.compile('\$\{[^\}]+\}') |
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71 | s = self.fields[label.lower()] |
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72 | expanded = True |
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73 | tm = False |
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74 | while expanded: |
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75 | expanded = False |
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76 | if tm: |
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77 | print 'pc:get: "' + s + '"' |
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78 | ms = mre.findall(s) |
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79 | for m in ms: |
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80 | mn = m[2:-1] |
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81 | if mn.lower() in self.defines: |
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82 | s = s.replace(m, self.defines[mn.lower()]) |
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83 | expanded = True |
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84 | return s |
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