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Þ'¯°ÌME[YéïĵÂCå½ Ué©Áû'Ê9%eÔðNU”ë‘ÌsD3/®+UI˜9h.WC”빓$#:pz:YÓ ¿xž* ³$Í +$kñAŠ‹†¢ Uê>¸)_š¬÷©ßAÂÔb9ÇU ¯¾á•9¯ÏÏ÷O÷¼¼Fähal1‰3Ì[Ïr•´UCksNÐ] R‘¸¥H+§Šé†c©vÖÞ0iÓ76s†î!§=ß ¼~Ô'°Ãmäoäš³ªøi1úÉ)³yV8 CLÄØÁ‘WYïi€H6ÖÑiámø^ÈY´°Ñ7¥Û*—Ñ©L«Qƒï—Ùrÿ ›£Ð*š¸ˆL©ˆ$ˆ ÷¾D§9È®«qbqC)–ˆïv´çñsÑVT­Ø, <àïºÀO«Jý·õ àfPìð .wFšir´þ’2_Y *Æ€x\« ì€9š@ Ž|F⇥ˆkZ@hÖÄ0t¿-<“‹qµ¾*ZL¤Ú)&BJpÓF5=$„at*Zš$’ÑtdûÝRI1 2Ž‰$€$I$#‰SÞ’Hë¬ï;Á$¡t$’`<(ñÇt)$‡Ð.Êf¢X’Kt=Éé$‚ˆªè¢oÝëòI%Rgcª÷ŠyI%¡‰ÿ !ñ)´õ $¤ Ô’IIGÿÙ# ----------------------------------------------------------------- # _ast_gen.py # # Generates the AST Node classes from a specification given in # a configuration file. This module can also be run as a script to # regenerate c_ast.py from _c_ast.cfg (from the repo root or the # pycparser/ directory). Use 'make check' to reformat the generated # file after running this script. # # The design of this module was inspired by astgen.py from the # Python 2.5 code-base. # # Eli Bendersky [https://eli.thegreenplace.net/] # License: BSD # ----------------------------------------------------------------- from string import Template import os from typing import IO class ASTCodeGenerator: def __init__(self, cfg_filename="_c_ast.cfg"): """Initialize the code generator from a configuration file. """ self.cfg_filename = cfg_filename self.node_cfg = [ NodeCfg(name, contents) for (name, contents) in self.parse_cfgfile(cfg_filename) ] def generate(self, file: IO[str]) -> None: """Generates the code into file, an open file buffer.""" src = Template(_PROLOGUE_COMMENT).substitute(cfg_filename=self.cfg_filename) src += _PROLOGUE_CODE for node_cfg in self.node_cfg: src += node_cfg.generate_source() + "\n\n" file.write(src) def parse_cfgfile(self, filename): """Parse the configuration file and yield pairs of (name, contents) for each node. """ with open(filename, "r") as f: for line in f: line = line.strip() if not line or line.startswith("#"): continue colon_i = line.find(":") lbracket_i = line.find("[") rbracket_i = line.find("]") if colon_i < 1 or lbracket_i <= colon_i or rbracket_i <= lbracket_i: raise RuntimeError(f"Invalid line in {filename}:\n{line}\n") name = line[:colon_i] val = line[lbracket_i + 1 : rbracket_i] vallist = [v.strip() for v in val.split(",")] if val else [] yield name, vallist class NodeCfg: """Node configuration. name: node name contents: a list of contents - attributes and child nodes See comment at the top of the configuration file for details. """ def __init__(self, name, contents): self.name = name self.all_entries = [] self.attr = [] self.child = [] self.seq_child = [] for entry in contents: clean_entry = entry.rstrip("*") self.all_entries.append(clean_entry) if entry.endswith("**"): self.seq_child.append(clean_entry) elif entry.endswith("*"): self.child.append(clean_entry) else: self.attr.append(entry) def generate_source(self): src = self._gen_init() src += "\n" + self._gen_children() src += "\n" + self._gen_iter() src += "\n" + self._gen_attr_names() return src def _gen_init(self): src = f"class {self.name}(Node):\n" if self.all_entries: args = ", ".join(self.all_entries) slots = ", ".join(f"'{e}'" for e in self.all_entries) slots += ", 'coord', '__weakref__'" arglist = f"(self, {args}, coord=None)" else: slots = "'coord', '__weakref__'" arglist = "(self, coord=None)" src += f" __slots__ = ({slots})\n" src += f" def __init__{arglist}:\n" for name in self.all_entries + ["coord"]: src += f" self.{name} = {name}\n" return src def _gen_children(self): src = " def children(self):\n" if self.all_entries: src += " nodelist = []\n" for child in self.child: src += f" if self.{child} is not None:\n" src += f' nodelist.append(("{child}", self.{child}))\n' for seq_child in self.seq_child: src += f" for i, child in enumerate(self.{seq_child} or []):\n" src += f' nodelist.append((f"{seq_child}[{{i}}]", child))\n' src += " return tuple(nodelist)\n" else: src += " return ()\n" return src def _gen_iter(self): src = " def __iter__(self):\n" if self.all_entries: for child in self.child: src += f" if self.{child} is not None:\n" src += f" yield self.{child}\n" for seq_child in self.seq_child: src += f" for child in (self.{seq_child} or []):\n" src += " yield child\n" if not (self.child or self.seq_child): # Empty generator src += " return\n" + " yield\n" else: # Empty generator src += " return\n" + " yield\n" return src def _gen_attr_names(self): src = " attr_names = (" + "".join(f"{nm!r}, " for nm in self.attr) + ")" return src _PROLOGUE_COMMENT = r"""#----------------------------------------------------------------- # ** ATTENTION ** # This code was automatically generated from _c_ast.cfg # # Do not modify it directly. Modify the configuration file and # run the generator again. # ** ** *** ** ** # # pycparser: c_ast.py # # AST Node classes. # # Eli Bendersky [https://eli.thegreenplace.net/] # License: BSD #----------------------------------------------------------------- """ _PROLOGUE_CODE = r''' import sys from typing import Any, ClassVar, IO, Optional def _repr(obj): """ Get the representation of an object, with dedicated pprint-like format for lists. """ if isinstance(obj, list): return '[' + (',\n '.join((_repr(e).replace('\n', '\n ') for e in obj))) + '\n]' else: return repr(obj) class Node: __slots__ = () """ Abstract base class for AST nodes. """ attr_names: ClassVar[tuple[str, ...]] = () coord: Optional[Any] def __repr__(self): """ Generates a python representation of the current node """ result = self.__class__.__name__ + '(' indent = '' separator = '' for name in self.__slots__[:-2]: result += separator result += indent result += name + '=' + (_repr(getattr(self, name)).replace('\n', '\n ' + (' ' * (len(name) + len(self.__class__.__name__))))) separator = ',' indent = '\n ' + (' ' * len(self.__class__.__name__)) result += indent + ')' return result def children(self): """ A sequence of all children that are Nodes """ pass def show( self, buf: IO[str] = sys.stdout, offset: int = 0, attrnames: bool = False, showemptyattrs: bool = True, nodenames: bool = False, showcoord: bool = False, _my_node_name: Optional[str] = None, ): """ Pretty print the Node and all its attributes and children (recursively) to a buffer. buf: Open IO buffer into which the Node is printed. offset: Initial offset (amount of leading spaces) attrnames: True if you want to see the attribute names in name=value pairs. False to only see the values. showemptyattrs: False if you want to suppress printing empty attributes. nodenames: True if you want to see the actual node names within their parents. showcoord: Do you want the coordinates of each Node to be displayed. """ lead = ' ' * offset if nodenames and _my_node_name is not None: buf.write(lead + self.__class__.__name__+ ' <' + _my_node_name + '>: ') else: buf.write(lead + self.__class__.__name__+ ': ') if self.attr_names: def is_empty(v): v is None or (hasattr(v, '__len__') and len(v) == 0) nvlist = [(n, getattr(self,n)) for n in self.attr_names \ if showemptyattrs or not is_empty(getattr(self,n))] if attrnames: attrstr = ', '.join(f'{name}={value}' for name, value in nvlist) else: attrstr = ', '.join(f'{value}' for _, value in nvlist) buf.write(attrstr) if showcoord: buf.write(f' (at {self.coord})') buf.write('\n') for (child_name, child) in self.children(): child.show( buf, offset=offset + 2, attrnames=attrnames, showemptyattrs=showemptyattrs, nodenames=nodenames, showcoord=showcoord, _my_node_name=child_name) class NodeVisitor: """ A base NodeVisitor class for visiting c_ast nodes. Subclass it and define your own visit_XXX methods, where XXX is the class name you want to visit with these methods. For example: class ConstantVisitor(NodeVisitor): def __init__(self): self.values = [] def visit_Constant(self, node): self.values.append(node.value) Creates a list of values of all the constant nodes encountered below the given node. To use it: cv = ConstantVisitor() cv.visit(node) Notes: * generic_visit() will be called for AST nodes for which no visit_XXX method was defined. * The children of nodes for which a visit_XXX was defined will not be visited - if you need this, call generic_visit() on the node. You can use: NodeVisitor.generic_visit(self, node) * Modeled after Python's own AST visiting facilities (the ast module of Python 3.0) """ _method_cache = None def visit(self, node: Node): """ Visit a node. """ if self._method_cache is None: self._method_cache = {} visitor = self._method_cache.get(node.__class__.__name__, None) if visitor is None: method = 'visit_' + node.__class__.__name__ visitor = getattr(self, method, self.generic_visit) self._method_cache[node.__class__.__name__] = visitor return visitor(node) def generic_visit(self, node: Node): """ Called if no explicit visitor function exists for a node. Implements preorder visiting of the node. """ for _, c in node.children(): self.visit(c) ''' if __name__ == "__main__": base_dir = os.path.dirname(os.path.abspath(__file__)) cfg_path = os.path.join(base_dir, "_c_ast.cfg") out_path = os.path.join(base_dir, "c_ast.py") ast_gen = ASTCodeGenerator(cfg_path) with open(out_path, "w") as out: ast_gen.generate(out)