46 lines
1.5 KiB
Python
46 lines
1.5 KiB
Python
import logging
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from collections import defaultdict
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from tclint.syntax_tree import Command, CommandSub, Node, Script, Visitor
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class SymbolTable:
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"""Holds a symbol table (links symbols to nodes)."""
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def __init__(self) -> None:
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self.proc_def: defaultdict[str, list[Node]] = defaultdict(list)
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def add_proc_definition(self, command: Command) -> None:
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"""Add definition of procedure"""
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# command holds the "proc" keyword, so the proc name is 1st argument
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proc_name_node = command.args[0]
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proc_name = proc_name_node.contents
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if not proc_name:
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return
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logging.debug(
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f"Definition of proc '{proc_name}' at {proc_name_node._pos_str()}"
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)
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self.proc_def[proc_name].append(proc_name_node)
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def lookup_proc_definitions(self, symbol_text: str) -> list[Node]:
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"""Lookup definitions of the procedure pointed at by node"""
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if symbol_text is None or symbol_text not in self.proc_def:
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return []
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return self.proc_def[symbol_text]
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class SymbolTableBuilder(Visitor):
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"""Builds a symbol table."""
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def __init__(self):
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self.table = SymbolTable()
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def build(self, tree: CommandSub | Script) -> SymbolTable:
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"""Run the builder visitor through the syntax tree, building a table."""
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tree.accept(self, recurse=True)
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return self.table
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def visit_command(self, command: Command) -> None:
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if command.routine.contents == "proc":
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self.table.add_proc_definition(command)
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