1 #!/usr/bin/env python3
188 def ast_sym(ast, env):  argument
189     if ast in env:
190         return str(env[ast])
193 def ast_sym_int(ast, env):  argument
194     if ast in env:
195         v = env[ast]
202 def ast_expr(ast, env, edt):  argument
204         return not ast_expr(ast[1], env, edt)
206         return ast_expr(ast[1], env, edt) or ast_expr(ast[2], env, edt)
208         return ast_expr(ast[1], env, edt) and ast_expr(ast[2], env, edt)
210         return ast_sym(ast[1], env) == ast[2]
212         return ast_sym(ast[1], env) != ast[2]
214         return ast_sym_int(ast[1], env) > int(ast[2])
216         return ast_sym_int(ast[1], env) < int(ast[2])
218         return ast_sym_int(ast[1], env) >= int(ast[2])
220         return ast_sym_int(ast[1], env) <= int(ast[2])
222         return ast_sym(ast[1], env) in ast[2]
224         return bool(ast_sym(ast[1], env))
226         return bool(re.match(ast[2], ast_sym(ast[1], env)))
305 def parse(expr_text, env, edt):  argument
317     return ast_expr(ast, env, edt)