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|---|---|---|---|
| 1 | #include "ast/nodes.h" | ||
| 2 | #include "ast/ops.h" | ||
| 3 | |||
| 4 | namespace lython { | ||
| 5 | |||
| 6 | struct IsAttr { | ||
| 7 | using Return = StmtNode*; | ||
| 8 | |||
| 9 | IsAttr(String const& n): name(n) {} | ||
| 10 | |||
| 11 | String const& name; | ||
| 12 | |||
| 13 | static Return isattr(StmtNode* stmt, String const& name) { return IsAttr(name).lookup(stmt); } | ||
| 14 | |||
| 15 | bool match(ExprNode* n) { | ||
| 16 |
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20 | if (n->kind == NodeKind::Name) { |
| 17 | 20 | auto nn = cast<Name>(n); | |
| 18 |
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20 | if (nn->id == name) { |
| 19 | 4 | return true; | |
| 20 | } | ||
| 21 | } | ||
| 22 | 16 | return false; | |
| 23 | } | ||
| 24 | |||
| 25 | Return assign(Assign* n) { | ||
| 26 |
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16 | for (auto& target: n->targets) { |
| 27 |
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9 | if (match(target)) { |
| 28 | 2 | return n; | |
| 29 | } | ||
| 30 | } | ||
| 31 | 7 | return nullptr; | |
| 32 | } | ||
| 33 | Return annassign(AnnAssign* n) { | ||
| 34 |
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11 | if (match(n->target)) |
| 35 | 2 | return n; | |
| 36 | 9 | return nullptr; | |
| 37 | } | ||
| 38 | |||
| 39 | Return functiondef(FunctionDef* n) { | ||
| 40 |
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12 | if (n->name == name) { |
| 41 | 4 | return n; | |
| 42 | } | ||
| 43 | 8 | return nullptr; | |
| 44 | } | ||
| 45 | |||
| 46 | Return classdef(ClassDef* n) { | ||
| 47 |
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3 | if (n->name == name) { |
| 48 | 2 | return n; | |
| 49 | } | ||
| 50 | 1 | return nullptr; | |
| 51 | } | ||
| 52 | |||
| 53 | Return lookup(StmtNode* obj) { | ||
| 54 |
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35 | switch (obj->kind) { |
| 55 | 12 | case NodeKind::FunctionDef: { | |
| 56 | 12 | auto n = cast<FunctionDef>(obj); | |
| 57 | 12 | return functiondef(n); | |
| 58 | } | ||
| 59 | 9 | case NodeKind::Assign: { | |
| 60 | 9 | auto n = cast<Assign>(obj); | |
| 61 | 9 | return assign(n); | |
| 62 | } | ||
| 63 | 11 | case NodeKind::AnnAssign: { | |
| 64 | 11 | auto n = cast<AnnAssign>(obj); | |
| 65 | 11 | return annassign(n); | |
| 66 | } | ||
| 67 | 3 | case NodeKind::ClassDef: { | |
| 68 | 3 | auto n = cast<ClassDef>(obj); | |
| 69 | 3 | return classdef(n); | |
| 70 | } | ||
| 71 | |||
| 72 | ✗ | default: break; | |
| 73 | } | ||
| 74 | ✗ | return nullptr; | |
| 75 | } | ||
| 76 | }; | ||
| 77 | |||
| 78 | StmtNode* getattr(StmtNode* obj, String const& attr, ExprNode*& type) { | ||
| 79 |
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12 | if (obj->kind != NodeKind::ClassDef) { |
| 80 | 1 | return nullptr; | |
| 81 | } | ||
| 82 | |||
| 83 | 11 | ClassDef* def = cast<ClassDef>(obj); | |
| 84 |
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11 | int attrid = def->get_attribute(attr); |
| 85 | |||
| 86 |
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11 | if (attrid > -1) { |
| 87 | ✗ | ClassDef::Attr& at = def->attributes[attrid]; | |
| 88 | ✗ | return at.stmt; | |
| 89 | } | ||
| 90 | |||
| 91 | // Static Lookup | ||
| 92 |
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36 | for (auto& stmt: def->body) { |
| 93 |
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35 | auto value = IsAttr::isattr(stmt, attr); |
| 94 | |||
| 95 |
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35 | if (value != nullptr) { |
| 96 | 10 | return value; | |
| 97 | } | ||
| 98 | } | ||
| 99 | |||
| 100 | 1 | return nullptr; | |
| 101 | }; | ||
| 102 | |||
| 103 | bool hasattr(StmtNode* obj, String const& attr) { | ||
| 104 | ExprNode* dummy; | ||
| 105 |
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7 | return getattr(obj, attr, dummy) != nullptr; |
| 106 | } | ||
| 107 | |||
| 108 | } // namespace lython | ||
| 109 |