Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/pip/_vendor/resolvelib/providers.py @ 0:4f3585e2f14b draft default tip
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author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 class AbstractProvider(object): |
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2 """Delegate class to provide requirement interface for the resolver.""" |
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3 |
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4 def identify(self, requirement_or_candidate): |
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5 """Given a requirement or candidate, return an identifier for it. |
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6 |
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7 This is used in many places to identify a requirement or candidate, |
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8 e.g. whether two requirements should have their specifier parts merged, |
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9 whether two candidates would conflict with each other (because they |
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10 have same name but different versions). |
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11 """ |
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12 raise NotImplementedError |
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13 |
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14 def get_preference(self, resolution, candidates, information): |
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15 """Produce a sort key for given requirement based on preference. |
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16 |
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17 The preference is defined as "I think this requirement should be |
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18 resolved first". The lower the return value is, the more preferred |
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19 this group of arguments is. |
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20 |
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21 :param resolution: Currently pinned candidate, or `None`. |
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22 :param candidates: An iterable of possible candidates. |
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23 :param information: A list of requirement information. |
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24 |
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25 The `candidates` iterable's exact type depends on the return type of |
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26 `find_matches()`. A sequence is passed-in as-is if possible. If it |
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27 returns a callble, the iterator returned by that callable is passed |
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28 in here. |
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29 |
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30 Each element in `information` is a named tuple with two entries: |
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31 |
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32 * `requirement` specifies a requirement contributing to the current |
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33 candidate list. |
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34 * `parent` specifies the candidate that provides (dependend on) the |
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35 requirement, or `None` to indicate a root requirement. |
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36 |
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37 The preference could depend on a various of issues, including (not |
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38 necessarily in this order): |
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39 |
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40 * Is this package pinned in the current resolution result? |
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41 * How relaxed is the requirement? Stricter ones should probably be |
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42 worked on first? (I don't know, actually.) |
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43 * How many possibilities are there to satisfy this requirement? Those |
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44 with few left should likely be worked on first, I guess? |
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45 * Are there any known conflicts for this requirement? We should |
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46 probably work on those with the most known conflicts. |
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47 |
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48 A sortable value should be returned (this will be used as the `key` |
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49 parameter of the built-in sorting function). The smaller the value is, |
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50 the more preferred this requirement is (i.e. the sorting function |
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51 is called with `reverse=False`). |
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52 """ |
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53 raise NotImplementedError |
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54 |
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55 def find_matches(self, requirements): |
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56 """Find all possible candidates that satisfy the given requirements. |
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57 |
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58 This should try to get candidates based on the requirements' types. |
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59 For VCS, local, and archive requirements, the one-and-only match is |
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60 returned, and for a "named" requirement, the index(es) should be |
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61 consulted to find concrete candidates for this requirement. |
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62 |
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63 The return value should produce candidates ordered by preference; the |
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64 most preferred candidate should come first. The return type may be one |
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65 of the following: |
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66 |
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67 * A callable that returns an iterator that yields candidates. |
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68 * An collection of candidates. |
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69 * An iterable of candidates. This will be consumed immediately into a |
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70 list of candidates. |
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71 |
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72 :param requirements: A collection of requirements which all of the |
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73 returned candidates must match. All requirements are guaranteed to |
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74 have the same identifier. The collection is never empty. |
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75 """ |
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76 raise NotImplementedError |
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77 |
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78 def is_satisfied_by(self, requirement, candidate): |
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79 """Whether the given requirement can be satisfied by a candidate. |
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80 |
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81 The candidate is guarenteed to have been generated from the |
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82 requirement. |
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83 |
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84 A boolean should be returned to indicate whether `candidate` is a |
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85 viable solution to the requirement. |
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86 """ |
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87 raise NotImplementedError |
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88 |
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89 def get_dependencies(self, candidate): |
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90 """Get dependencies of a candidate. |
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91 |
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92 This should return a collection of requirements that `candidate` |
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93 specifies as its dependencies. |
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94 """ |
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95 raise NotImplementedError |
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96 |
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97 |
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98 class AbstractResolver(object): |
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99 """The thing that performs the actual resolution work.""" |
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100 |
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101 base_exception = Exception |
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102 |
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103 def __init__(self, provider, reporter): |
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104 self.provider = provider |
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105 self.reporter = reporter |
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106 |
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107 def resolve(self, requirements, **kwargs): |
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108 """Take a collection of constraints, spit out the resolution result. |
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109 |
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110 This returns a representation of the final resolution state, with one |
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111 guarenteed attribute ``mapping`` that contains resolved candidates as |
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112 values. The keys are their respective identifiers. |
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113 |
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114 :param requirements: A collection of constraints. |
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115 :param kwargs: Additional keyword arguments that subclasses may accept. |
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116 |
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117 :raises: ``self.base_exception`` or its subclass. |
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118 """ |
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119 raise NotImplementedError |