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420 lines
11 KiB
Python
420 lines
11 KiB
Python
"""An implementation of the Zephyr Abstract Syntax Definition Language.
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See http://asdl.sourceforge.net/ and
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http://www.cs.princeton.edu/research/techreps/TR-554-97
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Only supports top level module decl, not view. I'm guessing that view
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is intended to support the browser and I'm not interested in the
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browser.
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Changes for Python: Add support for module versions
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"""
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import os
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import sys
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import traceback
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import spark
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def output(string):
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sys.stdout.write(string + "\n")
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class Token(object):
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# spark seems to dispatch in the parser based on a token's
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# type attribute
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def __init__(self, type, lineno):
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self.type = type
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self.lineno = lineno
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def __str__(self):
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return self.type
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def __repr__(self):
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return str(self)
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class Id(Token):
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def __init__(self, value, lineno):
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self.type = 'Id'
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self.value = value
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self.lineno = lineno
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def __str__(self):
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return self.value
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class String(Token):
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def __init__(self, value, lineno):
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self.type = 'String'
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self.value = value
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self.lineno = lineno
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class ASDLSyntaxError(Exception):
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def __init__(self, lineno, token=None, msg=None):
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self.lineno = lineno
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self.token = token
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self.msg = msg
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def __str__(self):
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if self.msg is None:
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return "Error at '%s', line %d" % (self.token, self.lineno)
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else:
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return "%s, line %d" % (self.msg, self.lineno)
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class ASDLScanner(spark.GenericScanner, object):
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def tokenize(self, input):
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self.rv = []
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self.lineno = 1
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super(ASDLScanner, self).tokenize(input)
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return self.rv
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def t_id(self, s):
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r"[\w\.]+"
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# XXX doesn't distinguish upper vs. lower, which is
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# significant for ASDL.
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self.rv.append(Id(s, self.lineno))
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def t_string(self, s):
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r'"[^"]*"'
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self.rv.append(String(s, self.lineno))
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def t_xxx(self, s): # not sure what this production means
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r"<="
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self.rv.append(Token(s, self.lineno))
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def t_punctuation(self, s):
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r"[\{\}\*\=\|\(\)\,\?\:]"
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self.rv.append(Token(s, self.lineno))
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def t_comment(self, s):
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r"\-\-[^\n]*"
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pass
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def t_newline(self, s):
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r"\n"
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self.lineno += 1
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def t_whitespace(self, s):
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r"[ \t]+"
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pass
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def t_default(self, s):
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r" . +"
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raise ValueError("unmatched input: %r" % s)
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class ASDLParser(spark.GenericParser, object):
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def __init__(self):
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super(ASDLParser, self).__init__("module")
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def typestring(self, tok):
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return tok.type
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def error(self, tok):
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raise ASDLSyntaxError(tok.lineno, tok)
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def p_module_0(self, info):
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" module ::= Id Id { } "
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module, name, _0, _1 = info
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if module.value != "module":
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raise ASDLSyntaxError(module.lineno,
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msg="expected 'module', found %s" % module)
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return Module(name, None)
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def p_module(self, info):
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" module ::= Id Id { definitions } "
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module, name, _0, definitions, _1 = info
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if module.value != "module":
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raise ASDLSyntaxError(module.lineno,
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msg="expected 'module', found %s" % module)
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return Module(name, definitions)
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def p_definition_0(self, definition):
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" definitions ::= definition "
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return definition[0]
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def p_definition_1(self, definitions):
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" definitions ::= definition definitions "
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return definitions[0] + definitions[1]
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def p_definition(self, info):
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" definition ::= Id = type "
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id, _, type = info
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return [Type(id, type)]
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def p_type_0(self, product):
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" type ::= product "
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return product[0]
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def p_type_1(self, sum):
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" type ::= sum "
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return Sum(sum[0])
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def p_type_2(self, info):
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" type ::= sum Id ( fields ) "
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sum, id, _0, attributes, _1 = info
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if id.value != "attributes":
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raise ASDLSyntaxError(id.lineno,
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msg="expected attributes, found %s" % id)
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return Sum(sum, attributes)
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def p_product(self, info):
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" product ::= ( fields ) "
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_0, fields, _1 = info
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return Product(fields)
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def p_sum_0(self, constructor):
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" sum ::= constructor "
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return [constructor[0]]
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def p_sum_1(self, info):
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" sum ::= constructor | sum "
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constructor, _, sum = info
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return [constructor] + sum
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def p_sum_2(self, info):
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" sum ::= constructor | sum "
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constructor, _, sum = info
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return [constructor] + sum
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def p_constructor_0(self, id):
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" constructor ::= Id "
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return Constructor(id[0])
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def p_constructor_1(self, info):
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" constructor ::= Id ( fields ) "
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id, _0, fields, _1 = info
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return Constructor(id, fields)
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def p_fields_0(self, field):
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" fields ::= field "
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return [field[0]]
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def p_fields_1(self, info):
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" fields ::= fields , field "
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fields, _, field = info
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return fields + [field]
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def p_field_0(self, type_):
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" field ::= Id "
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return Field(type_[0])
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def p_field_1(self, info):
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" field ::= Id Id "
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type, name = info
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return Field(type, name)
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def p_field_2(self, info):
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" field ::= Id * Id "
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type, _, name = info
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return Field(type, name, seq=True)
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def p_field_3(self, info):
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" field ::= Id ? Id "
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type, _, name = info
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return Field(type, name, opt=True)
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def p_field_4(self, type_):
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" field ::= Id * "
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return Field(type_[0], seq=True)
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def p_field_5(self, type_):
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" field ::= Id ? "
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return Field(type[0], opt=True)
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builtin_types = ("identifier", "string", "bytes", "int", "object")
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# below is a collection of classes to capture the AST of an AST :-)
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# not sure if any of the methods are useful yet, but I'm adding them
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# piecemeal as they seem helpful
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class AST(object):
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pass # a marker class
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class Module(AST):
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def __init__(self, name, dfns):
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self.name = name
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self.dfns = dfns
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self.types = {} # maps type name to value (from dfns)
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for type in dfns:
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self.types[type.name.value] = type.value
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def __repr__(self):
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return "Module(%s, %s)" % (self.name, self.dfns)
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class Type(AST):
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def __init__(self, name, value):
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self.name = name
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self.value = value
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def __repr__(self):
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return "Type(%s, %s)" % (self.name, self.value)
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class Constructor(AST):
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def __init__(self, name, fields=None):
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self.name = name
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self.fields = fields or []
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def __repr__(self):
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return "Constructor(%s, %s)" % (self.name, self.fields)
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class Field(AST):
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def __init__(self, type, name=None, seq=False, opt=False):
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self.type = type
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self.name = name
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self.seq = seq
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self.opt = opt
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def __repr__(self):
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if self.seq:
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extra = ", seq=True"
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elif self.opt:
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extra = ", opt=True"
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else:
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extra = ""
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if self.name is None:
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return "Field(%s%s)" % (self.type, extra)
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else:
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return "Field(%s, %s%s)" % (self.type, self.name, extra)
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class Sum(AST):
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def __init__(self, types, attributes=None):
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self.types = types
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self.attributes = attributes or []
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def __repr__(self):
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if self.attributes is None:
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return "Sum(%s)" % self.types
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else:
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return "Sum(%s, %s)" % (self.types, self.attributes)
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class Product(AST):
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def __init__(self, fields):
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self.fields = fields
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def __repr__(self):
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return "Product(%s)" % self.fields
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class VisitorBase(object):
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def __init__(self, skip=False):
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self.cache = {}
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self.skip = skip
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def visit(self, object, *args):
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meth = self._dispatch(object)
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if meth is None:
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return
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try:
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meth(object, *args)
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except Exception:
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output("Error visiting" + repr(object))
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output(str(sys.exc_info()[1]))
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traceback.print_exc()
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# XXX hack
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if hasattr(self, 'file'):
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self.file.flush()
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os._exit(1)
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def _dispatch(self, object):
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assert isinstance(object, AST), repr(object)
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klass = object.__class__
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meth = self.cache.get(klass)
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if meth is None:
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methname = "visit" + klass.__name__
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if self.skip:
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meth = getattr(self, methname, None)
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else:
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meth = getattr(self, methname)
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self.cache[klass] = meth
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return meth
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class Check(VisitorBase):
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def __init__(self):
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super(Check, self).__init__(skip=True)
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self.cons = {}
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self.errors = 0
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self.types = {}
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def visitModule(self, mod):
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for dfn in mod.dfns:
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self.visit(dfn)
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def visitType(self, type):
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self.visit(type.value, str(type.name))
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def visitSum(self, sum, name):
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for t in sum.types:
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self.visit(t, name)
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def visitConstructor(self, cons, name):
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key = str(cons.name)
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conflict = self.cons.get(key)
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if conflict is None:
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self.cons[key] = name
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else:
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output("Redefinition of constructor %s" % key)
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output("Defined in %s and %s" % (conflict, name))
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self.errors += 1
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for f in cons.fields:
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self.visit(f, key)
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def visitField(self, field, name):
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key = str(field.type)
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l = self.types.setdefault(key, [])
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l.append(name)
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def visitProduct(self, prod, name):
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for f in prod.fields:
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self.visit(f, name)
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def check(mod):
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v = Check()
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v.visit(mod)
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for t in v.types:
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if t not in mod.types and not t in builtin_types:
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v.errors += 1
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uses = ", ".join(v.types[t])
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output("Undefined type %s, used in %s" % (t, uses))
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return not v.errors
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def parse(file):
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scanner = ASDLScanner()
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parser = ASDLParser()
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buf = open(file).read()
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tokens = scanner.tokenize(buf)
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try:
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return parser.parse(tokens)
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except ASDLSyntaxError:
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err = sys.exc_info()[1]
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output(str(err))
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lines = buf.split("\n")
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output(lines[err.lineno - 1]) # lines starts at 0, files at 1
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if __name__ == "__main__":
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import glob
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import sys
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if len(sys.argv) > 1:
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files = sys.argv[1:]
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else:
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testdir = "tests"
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files = glob.glob(testdir + "/*.asdl")
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for file in files:
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output(file)
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mod = parse(file)
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if not mod:
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break
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output("module", mod.name)
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output(len(mod.dfns), "definitions")
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if not check(mod):
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output("Check failed")
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else:
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for dfn in mod.dfns:
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output(dfn.type)
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