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676 lines
24 KiB
676 lines
24 KiB
#! /usr/bin/env python3
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# Script to parse spec output CSVs and produce C files.
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# Released by lisa neigut under CC0:
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# https://creativecommons.org/publicdomain/zero/1.0/
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#
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# Reads from stdin, outputs C header or body file.
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#
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# Standard message types:
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# msgtype,<msgname>,<value>[,<option>]
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# msgdata,<msgname>,<fieldname>,<typename>,[<count>][,<option>]
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#
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# TLV types:
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# tlvtype,<tlvstreamname>,<tlvname>,<value>[,<option>]
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# tlvdata,<tlvstreamname>,<tlvname>,<fieldname>,<typename>,[<count>][,<option>]
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#
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# Subtypes:
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# subtype,<subtypename>
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# subtypedata,<subtypename>,<fieldname>,<typename>,[<count>]
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from argparse import ArgumentParser, REMAINDER
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from collections import OrderedDict
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import copy
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import fileinput
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from mako.template import Template
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import os
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import re
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import sys
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# Generator to give us one line at a time.
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def next_line(args, lines):
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if lines is None:
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lines = fileinput.input(args)
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for i, line in enumerate(lines):
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yield i + 1, line.strip()
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# Class definitions, to keep things classy
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class Field(object):
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def __init__(self, name, type_obj, extensions=[],
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field_comments=[], optional=False):
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self.name = name
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self.type_obj = type_obj
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self.count = 1
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self.len_field_of = None
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self.len_field = None
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self.implicit_len = False
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self.extension_names = extensions
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self.is_optional = optional
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self.field_comments = field_comments
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def __deepcopy__(self, memo):
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deepcopy_method = self.__deepcopy__
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self.__deepcopy__ = None
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field = copy.deepcopy(self, memo)
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self.__deepcopy__ = deepcopy_method
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field.type_obj = self.type_obj
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return field
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def add_count(self, count):
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self.count = int(count)
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def add_len_field(self, len_field):
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self.count = False
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# we cache our len-field's name
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self.len_field = len_field.name
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# the len-field caches our name
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len_field.len_field_of = self.name
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def add_implicit_len(self):
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self.count = False
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self.implicit_len = True
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def is_array(self):
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return self.count > 1
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def is_varlen(self):
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return not self.count
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def is_implicit_len(self):
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return self.implicit_len
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def is_extension(self):
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return bool(self.extension_names)
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def size(self, implicit_expression=None):
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if self.count:
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return self.count
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if self.len_field:
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return self.len_field
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assert self.is_implicit_len()
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assert implicit_expression
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return implicit_expression
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def needs_context(self):
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""" A field needs a context if it's varsized """
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return self.is_varlen() or self.type_obj.needs_context()
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def arg_desc_to(self):
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if self.len_field_of:
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return ''
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type_name = self.type_obj.type_name()
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if self.is_array():
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return ', const {} {}[{}]'.format(type_name, self.name, self.count)
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if self.type_obj.is_assignable() and not self.is_varlen():
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name = self.name
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if self.is_optional:
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name = '*' + name
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return ', {} {}'.format(type_name, name)
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if self.is_varlen() and self.type_obj.is_varsize():
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return ', const {} **{}'.format(type_name, self.name)
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return ', const {} *{}'.format(type_name, self.name)
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def arg_desc_from(self):
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type_name = self.type_obj.type_name()
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if self.type_obj.is_const_ptr_ptr_type():
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return ', const {} **{}'.format(type_name, self.name)
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if self.len_field_of:
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return ''
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if self.is_array():
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return ', {} {}[{}]'.format(type_name, self.name, self.count)
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ptrs = '*'
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if self.is_varlen() or self.is_optional or self.type_obj.is_varsize():
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ptrs += '*'
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if self.is_varlen() and self.type_obj.is_varsize():
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ptrs += '*'
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return ', {} {}{}'.format(type_name, ptrs, self.name)
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class FieldSet(object):
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def __init__(self):
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self.fields = OrderedDict()
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self.len_fields = {}
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def add_data_field(self, field_name, type_obj, count=1,
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extensions=[], comments=[], optional=False,
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implicit_len_ok=False):
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field = Field(field_name, type_obj, extensions=extensions,
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field_comments=comments, optional=optional)
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if bool(count):
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try:
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field.add_count(int(count))
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except ValueError:
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if count in self.fields:
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len_field = self.find_data_field(count)
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field.add_len_field(len_field)
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self.len_fields[len_field.name] = len_field
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else:
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# '...' means "rest of TLV"
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assert implicit_len_ok
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assert count == '...'
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field.add_implicit_len()
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# You can't have any fields after an implicit-length field.
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if len(self.fields) != 0:
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assert not self.fields[next(reversed(self.fields))].is_implicit_len()
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self.fields[field_name] = field
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def find_data_field(self, field_name):
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return self.fields[field_name]
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def get_len_fields(self):
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return list(self.len_fields.values())
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def has_len_fields(self):
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return bool(self.len_fields)
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def needs_context(self):
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return any([field.needs_context() or field.is_optional for field in self.fields.values()])
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class Type(FieldSet):
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assignables = [
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'u8',
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'u16',
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'u32',
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'u64',
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'tu16',
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'tu32',
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'tu64',
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'bool',
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'amount_sat',
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'amount_msat',
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'bigsize',
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'varint'
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]
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typedefs = [
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'u8',
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'u16',
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'u32',
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'u64',
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'bool',
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'secp256k1_ecdsa_signature',
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'secp256k1_ecdsa_recoverable_signature',
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'wirestring',
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'double',
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'bigsize',
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'varint',
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]
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truncated_typedefs = [
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'tu16',
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'tu32',
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'tu64',
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]
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# Externally defined variable size types (require a context)
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varsize_types = [
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'peer_features',
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'gossip_getnodes_entry',
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'gossip_getchannels_entry',
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'failed_htlc',
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'utxo',
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'bitcoin_tx',
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'wirestring',
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'per_peer_state',
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'bitcoin_tx_output',
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'exclude_entry',
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]
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# Some BOLT types are re-typed based on their field name
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# ('fieldname partial', 'original type', 'outer type'): ('true type', 'collapse array?')
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name_field_map = {
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('txid', 'sha256'): ('bitcoin_txid', False),
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('amt', 'u64'): ('amount_msat', False),
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('msat', 'u64'): ('amount_msat', False),
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('satoshis', 'u64'): ('amount_sat', False),
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('node_id', 'pubkey', 'channel_announcement'): ('node_id', False),
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('node_id', 'pubkey', 'node_announcement'): ('node_id', False),
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('temporary_channel_id', 'u8'): ('channel_id', True),
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('secret', 'u8'): ('secret', True),
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('preimage', 'u8'): ('preimage', True),
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}
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# For BOLT specified types, a few type names need to be simply 'remapped'
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# 'original type': 'true type'
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name_remap = {
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'byte': 'u8',
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'signature': 'secp256k1_ecdsa_signature',
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'chain_hash': 'bitcoin_blkid',
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'point': 'pubkey',
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# FIXME: omits 'pad'
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}
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# Types that are const pointer-to-pointers, such as chainparams, i.e.,
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# they set a reference to some const entry.
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const_ptr_ptr_types = [
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'chainparams'
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]
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@staticmethod
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def true_type(type_name, field_name=None, outer_name=None):
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""" Returns 'true' type of a given type and a flag if
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we've remapped a variable size/array type to a single struct
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(an example of this is 'temporary_channel_id' which is specified
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as a 32*byte, but we re-map it to a channel_id
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"""
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if type_name in Type.name_remap:
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type_name = Type.name_remap[type_name]
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if field_name:
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for t, true_type in Type.name_field_map.items():
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if t[0] in field_name and t[1] == type_name:
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if len(t) == 2 or outer_name == t[2]:
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return true_type
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return (type_name, False)
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def __init__(self, name):
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FieldSet.__init__(self)
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self.name, self.is_enum = self.parse_name(name)
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self.depends_on = {}
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self.type_comments = []
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self.tlv = False
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def parse_name(self, name):
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if name.startswith('enum '):
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return name[5:], True
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return name, False
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def add_data_field(self, field_name, type_obj, count=1,
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extensions=[], comments=[], optional=False):
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FieldSet.add_data_field(self, field_name, type_obj, count,
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extensions=extensions,
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comments=comments, optional=optional)
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if type_obj.name not in self.depends_on:
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self.depends_on[type_obj.name] = type_obj
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def type_name(self):
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if self.name in self.typedefs:
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return self.name
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if self.name in self.truncated_typedefs:
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return self.name[1:]
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if self.is_enum:
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prefix = 'enum '
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else:
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prefix = 'struct '
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return prefix + self.struct_name()
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# We only accelerate the u8 case: it's common and trivial.
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def has_array_helper(self):
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return self.name in ['u8']
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def struct_name(self):
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if self.is_tlv():
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return self.tlv.struct_name()
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return self.name
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def subtype_deps(self):
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return [dep for dep in self.depends_on.values() if dep.is_subtype()]
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def is_subtype(self):
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return bool(self.fields)
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def is_const_ptr_ptr_type(self):
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return self.name in self.const_ptr_ptr_types
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def is_truncated(self):
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return self.name in self.truncated_typedefs
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def needs_context(self):
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return self.is_varsize()
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def is_assignable(self):
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""" Generally typedef's and enums """
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return self.name in self.assignables or self.is_enum
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def is_varsize(self):
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""" A type is variably sized if it's marked as such (in varsize_types)
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or it contains a field of variable length """
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return self.name in self.varsize_types or self.has_len_fields()
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def add_comments(self, comments):
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self.type_comments = comments
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def mark_tlv(self, tlv):
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self.tlv = tlv
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def is_tlv(self):
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return bool(self.tlv)
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class Message(FieldSet):
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def __init__(self, name, number, option=[], enum_prefix='wire',
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struct_prefix=None, comments=[]):
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FieldSet.__init__(self)
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self.name = name
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self.number = number
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self.enum_prefix = enum_prefix
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self.option = option[0] if len(option) else None
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self.struct_prefix = struct_prefix
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self.enumname = None
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self.msg_comments = comments
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self.if_token = None
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def has_option(self):
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return self.option is not None
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def enum_name(self):
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name = self.enumname if self.enumname else self.name
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return "{}_{}".format(self.enum_prefix, name).upper()
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def struct_name(self):
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if self.struct_prefix:
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return self.struct_prefix + "_" + self.name
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return self.name
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def add_if(self, if_token):
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self.if_token = if_token
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class Tlv(object):
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def __init__(self, name):
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self.name = name
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self.messages = {}
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def add_message(self, tokens, comments=[]):
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""" tokens -> (name, value[, option]) """
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self.messages[tokens[0]] = Message(tokens[0], tokens[1], option=tokens[2:],
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enum_prefix=self.name,
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struct_prefix=self.struct_name(),
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comments=comments)
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def type_name(self):
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return 'struct ' + self.struct_name()
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def struct_name(self):
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return "tlv_{}".format(self.name)
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def find_message(self, name):
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return self.messages[name]
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def ordered_msgs(self):
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return sorted(self.messages.values(), key=lambda item: int(item.number))
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class Master(object):
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types = {}
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tlvs = {}
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messages = {}
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extension_msgs = {}
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inclusions = []
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top_comments = []
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def add_comments(self, comments):
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self.top_comments += comments
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def add_include(self, inclusion):
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self.inclusions.append(inclusion)
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def add_tlv(self, tlv_name):
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if tlv_name not in self.tlvs:
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self.tlvs[tlv_name] = Tlv(tlv_name)
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if tlv_name not in self.types:
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self.types[tlv_name] = Type(tlv_name)
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return self.tlvs[tlv_name]
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def add_message(self, tokens, comments=[]):
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""" tokens -> (name, value[, option])"""
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self.messages[tokens[0]] = Message(tokens[0], tokens[1], option=tokens[2:],
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comments=comments)
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def add_extension_msg(self, name, msg):
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self.extension_msgs[name] = msg
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def add_type(self, type_name, field_name=None, outer_name=None):
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optional = False
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if type_name.startswith('?'):
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type_name = type_name[1:]
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optional = True
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# Check for special type name re-mapping
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type_name, collapse_original = Type.true_type(type_name, field_name,
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outer_name)
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if type_name not in self.types:
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self.types[type_name] = Type(type_name)
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return self.types[type_name], collapse_original, optional
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def find_type(self, type_name):
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return self.types[type_name]
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def find_message(self, msg_name):
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if msg_name in self.messages:
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return self.messages[msg_name]
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if msg_name in self.extension_msgs:
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return self.extension_msgs[msg_name]
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return None
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def find_tlv(self, tlv_name):
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return self.tlvs[tlv_name]
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def get_ordered_subtypes(self):
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""" We want to order subtypes such that the 'no dependency'
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types are printed first """
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subtypes = [s for s in self.types.values() if s.is_subtype()]
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# Start with subtypes without subtype dependencies
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sorted_types = [s for s in subtypes if not len(s.subtype_deps())]
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unsorted = [s for s in subtypes if len(s.subtype_deps())]
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while len(unsorted):
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names = [s.name for s in sorted_types]
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for s in list(unsorted):
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if all([dependency.name in names for dependency in s.subtype_deps()]):
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sorted_types.append(s)
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unsorted.remove(s)
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return sorted_types
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def tlv_messages(self):
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return [m for tlv in self.tlvs.values() for m in tlv.messages.values()]
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def find_template(self, options):
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dirpath = os.path.dirname(os.path.abspath(__file__))
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filename = dirpath + '/gen/{}{}_template'.format(
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'print_' if options.print_wire else '', options.page)
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return Template(filename=filename)
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def post_process(self):
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""" method to handle any 'post processing' that needs to be done.
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for now, we just need match up types to TLVs """
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for tlv_name, tlv in self.tlvs.items():
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if tlv_name in self.types:
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self.types[tlv_name].mark_tlv(tlv)
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def write(self, options, output):
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template = self.find_template(options)
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enum_sets = []
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enum_sets.append({
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'name': options.enum_name,
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'set': self.messages.values(),
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})
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stuff = {}
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stuff['top_comments'] = self.top_comments
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stuff['options'] = options
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stuff['idem'] = re.sub(r'[^A-Z]+', '_', options.header_filename.upper())
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stuff['header_filename'] = options.header_filename
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stuff['includes'] = self.inclusions
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stuff['enum_sets'] = enum_sets
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subtypes = self.get_ordered_subtypes()
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stuff['structs'] = subtypes + self.tlv_messages()
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stuff['tlvs'] = self.tlvs
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# We leave out extension messages in the printing pages. Any extension
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# fields will get printed under the 'original' message, if present
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if options.print_wire:
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stuff['messages'] = list(self.messages.values())
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else:
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stuff['messages'] = list(self.messages.values()) + list(self.extension_msgs.values())
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stuff['subtypes'] = subtypes
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print(template.render(**stuff), file=output)
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def main(options, args=None, output=sys.stdout, lines=None):
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genline = next_line(args, lines)
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comment_set = []
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token_name = None
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# Create a new 'master' that serves as the coordinator for the file generation
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master = Master()
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try:
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while True:
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ln, line = next(genline)
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tokens = line.split(',')
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token_type = tokens[0]
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if not bool(line):
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master.add_comments(comment_set)
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comment_set = []
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token_name = None
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continue
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if len(tokens) > 2:
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token_name = tokens[1]
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if token_type == 'subtype':
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subtype, _, _ = master.add_type(tokens[1])
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subtype.add_comments(list(comment_set))
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comment_set = []
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elif token_type == 'subtypedata':
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subtype = master.find_type(tokens[1])
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if not subtype:
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raise ValueError('Unknown subtype {} for data.\nat {}:{}'
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.format(tokens[1], ln, line))
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type_obj, collapse, optional = master.add_type(tokens[3], tokens[2], tokens[1])
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if optional:
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raise ValueError('Subtypes cannot have optional fields {}.{}\n at {}:{}'
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.format(subtype.name, tokens[2], ln, line))
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if collapse:
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count = 1
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else:
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count = tokens[4]
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subtype.add_data_field(tokens[2], type_obj, count, comments=list(comment_set),
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optional=optional)
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comment_set = []
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elif token_type == 'tlvtype':
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tlv = master.add_tlv(tokens[1])
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tlv.add_message(tokens[2:], comments=list(comment_set))
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|
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comment_set = []
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elif token_type == 'tlvdata':
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type_obj, collapse, optional = master.add_type(tokens[4], tokens[3], tokens[1])
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if optional:
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raise ValueError('TLV messages cannot have optional fields {}.{}\n at {}:{}'
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.format(tokens[2], tokens[3], ln, line))
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|
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tlv = master.find_tlv(tokens[1])
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if not tlv:
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raise ValueError('tlvdata for unknown tlv {}.\nat {}:{}'
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.format(tokens[1], ln, line))
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msg = tlv.find_message(tokens[2])
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if not msg:
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raise ValueError('tlvdata for unknown tlv-message {}.\nat {}:{}'
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.format(tokens[2], ln, line))
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if collapse:
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count = 1
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else:
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|
count = tokens[5]
|
|
|
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msg.add_data_field(tokens[3], type_obj, count, comments=list(comment_set),
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optional=optional, implicit_len_ok=True)
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|
comment_set = []
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elif token_type == 'msgtype':
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|
master.add_message(tokens[1:], comments=list(comment_set))
|
|
comment_set = []
|
|
elif token_type == 'msgdata':
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|
msg = master.find_message(tokens[1])
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|
if not msg:
|
|
raise ValueError('Unknown message type {}. {}:{}'.format(tokens[1], ln, line))
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|
type_obj, collapse, optional = master.add_type(tokens[3], tokens[2], tokens[1])
|
|
|
|
if collapse:
|
|
count = 1
|
|
elif len(tokens) < 5:
|
|
raise ValueError('problem with parsing {}:{}'.format(ln, line))
|
|
else:
|
|
count = tokens[4]
|
|
|
|
# if this is an 'extension' field*, we want to add a new 'message' type
|
|
# in the future, extensions will be handled as TLV's
|
|
#
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|
# *(in the spec they're called 'optional', but that term is overloaded
|
|
# in that internal wire messages have 'optional' fields that are treated
|
|
# differently. for the sake of clarity here, for bolt-wire messages,
|
|
# we'll refer to 'optional' message fields as 'extensions')
|
|
#
|
|
if tokens[5:] == []:
|
|
msg.add_data_field(tokens[2], type_obj, count, comments=list(comment_set),
|
|
optional=optional)
|
|
else: # is one or more extension fields
|
|
if optional:
|
|
raise ValueError("Extension fields cannot be optional. {}:{}"
|
|
.format(ln, line))
|
|
orig_msg = msg
|
|
for extension in tokens[5:]:
|
|
extension_name = "{}_{}".format(tokens[1], extension)
|
|
msg = master.find_message(extension_name)
|
|
if not msg:
|
|
msg = copy.deepcopy(orig_msg)
|
|
msg.enumname = msg.name
|
|
msg.name = extension_name
|
|
master.add_extension_msg(msg.name, msg)
|
|
msg.add_data_field(tokens[2], type_obj, count, comments=list(comment_set), optional=optional)
|
|
|
|
# If this is a print_wire page, add the extension fields to the
|
|
# original message, so we can print them if present.
|
|
if options.print_wire:
|
|
orig_msg.add_data_field(tokens[2], type_obj, count=count,
|
|
extensions=tokens[5:],
|
|
comments=list(comment_set),
|
|
optional=optional)
|
|
|
|
comment_set = []
|
|
elif token_type.startswith('#include'):
|
|
master.add_include(token_type)
|
|
elif token_type.startswith('#if'):
|
|
msg = master.find_message(token_name)
|
|
if (msg):
|
|
if_token = token_type[token_type.index(' ') + 1:]
|
|
msg.add_if(if_token)
|
|
elif token_type.startswith('#'):
|
|
comment_set.append(token_type[1:])
|
|
else:
|
|
raise ValueError("Unknown token type {} on line {}:{}".format(token_type, ln, line))
|
|
|
|
except StopIteration:
|
|
pass
|
|
|
|
master.post_process()
|
|
master.write(options, output)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
parser = ArgumentParser()
|
|
parser.add_argument("-s", "--expose-subtypes", help="print subtypes in header",
|
|
action="store_true", default=False)
|
|
parser.add_argument("-P", "--print_wire", help="generate wire printing source files",
|
|
action="store_true", default=False)
|
|
parser.add_argument("--page", choices=['header', 'impl'], help="page to print")
|
|
parser.add_argument('--expose-tlv-type', action='append', default=[])
|
|
parser.add_argument('header_filename', help='The filename of the header')
|
|
parser.add_argument('enum_name', help='The name of the enum to produce')
|
|
parser.add_argument("files", help='Files to read in (or stdin)', nargs=REMAINDER)
|
|
parsed_args = parser.parse_args()
|
|
|
|
main(parsed_args, parsed_args.files)
|
|
|