The syntax of a source list file is a very small subset of GNU Make. These
features are supported
- operators: +=, :=
+ operators: =, +=, :=
line continuation
non-nested variable expansion
comment
class SourceListParser(object):
def __init__(self):
+ self.symbol_table = {}
self._reset()
def _reset(self, filename=None):
self.line_no = 1
self.line_cont = ''
- self.symbol_table = {}
def _error(self, msg):
raise RuntimeError('%s:%d: %s' % (self.filename, self.line_no, msg))
if op_pos < 0:
self._error('not a variable definition')
- if op_pos > 0 and line[op_pos - 1] in [':', '+']:
- op_pos -= 1
+ if op_pos > 0:
+ if line[op_pos - 1] in [':', '+', '?']:
+ op_pos -= 1
else:
- self._error('only := and += are supported')
+ self._error('only =, :=, and += are supported')
# set op, sym, and val
op = line[op_pos:op_end]
sym = line[:op_pos].strip()
val = self._expand_value(line[op_end:].lstrip())
- if op == ':=':
+ if op in ('=', ':='):
self.symbol_table[sym] = val
elif op == '+=':
self.symbol_table[sym] += ' ' + val
+ elif op == '?=':
+ if sym not in self.symbol_table:
+ self.symbol_table[sym] = val
def _parse_line(self, line):
"""Parse a source list line."""
raise
return self.symbol_table
+
+ def add_symbol(self, name, value):
+ self.symbol_table[name] = value