Mercurial > lcfOS
annotate python/c3/visitor.py @ 251:6ed3d3a82a63
Added another c3 example. First import attempt
| author | Windel Bouwman |
|---|---|
| date | Mon, 29 Jul 2013 20:23:13 +0200 |
| parents | 88a1e0baef65 |
| children | e64bae57cda8 |
| rev | line source |
|---|---|
| 163 | 1 from .astnodes import * |
| 2 | |
| 3 class Visitor: | |
| 228 | 4 """ |
| 215 | 5 Visitor that can visit all nodes in the AST |
| 6 and run pre and post functions. | |
| 7 """ | |
| 8 def visit(self, node, f_pre=None, f_post=None): | |
| 9 self.f_pre = f_pre | |
| 10 self.f_post = f_post | |
| 11 self.do(node) | |
| 12 | |
| 13 def do(self, node): | |
| 228 | 14 # Run visitor: |
| 15 if self.f_pre: | |
| 215 | 16 self.f_pre(node) |
| 17 | |
| 228 | 18 # Descent into subnodes: |
| 19 if type(node) is Package: | |
| 215 | 20 for decl in node.declarations: |
| 21 self.do(decl) | |
| 228 | 22 elif type(node) is Function: |
| 215 | 23 for s in node.declarations: |
| 24 self.do(s) | |
| 25 self.do(node.body) | |
| 228 | 26 elif type(node) is CompoundStatement: |
| 230 | 27 for s in node.statements: |
| 28 self.do(s) | |
| 228 | 29 elif type(node) is IfStatement: |
| 30 self.do(node.condition) | |
| 31 self.do(node.truestatement) | |
| 32 if node.falsestatement: | |
| 33 self.do(node.falsestatement) | |
| 34 elif type(node) is FunctionCall: | |
| 35 for arg in node.args: | |
| 36 self.do(arg) | |
| 37 elif type(node) is Assignment: | |
| 38 self.do(node.lval) | |
| 39 self.do(node.rval) | |
| 40 elif type(node) is ReturnStatement: | |
| 41 self.do(node.expr) | |
| 42 elif type(node) is Binop: | |
|
220
3f6c30a5d234
Major change in expression parsing to enable pointers and structs
Windel Bouwman
parents:
215
diff
changeset
|
43 self.do(node.a) |
| 228 | 44 self.do(node.b) |
| 45 elif type(node) is Unop: | |
| 46 self.do(node.a) | |
| 47 elif type(node) is ExpressionStatement: | |
| 222 | 48 self.do(node.ex) |
| 228 | 49 elif type(node) is TypeCast: |
| 222 | 50 self.do(node.a) |
| 228 | 51 elif type(node) is FieldRef: |
| 225 | 52 self.do(node.base) |
| 228 | 53 elif type(node) is Deref: |
| 225 | 54 self.do(node.ptr) |
| 228 | 55 elif type(node) is Constant: |
| 230 | 56 self.do(node.value) |
| 228 | 57 elif type(node) in [VariableUse, Variable, Literal, FunctionType, DefinedType]: |
| 230 | 58 # Those nodes do not have child nodes. |
| 59 pass | |
| 228 | 60 elif type(node) is WhileStatement: |
| 230 | 61 self.do(node.condition) |
| 62 self.do(node.statement) | |
| 228 | 63 else: |
| 230 | 64 raise Exception('Could not visit "{0}"'.format(node)) |
| 163 | 65 |
| 228 | 66 # run post function |
| 67 if self.f_post: | |
| 215 | 68 self.f_post(node) |
| 69 |