# -*- coding: utf-8 -*-
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"""Utilities to generate source codes."""
__author__ = "hidehiko"
import types
CPP_STRING_LITERAL_EXCEPTION = ['\\', '"']
def _CppCharEscape(c):
code = ord(c)
if 0x20 <= code <= 0x7E and c not in CPP_STRING_LITERAL_EXCEPTION:
return c
return r'\x%02X' % code
def ToCppStringLiteral(s):
"""Returns C-style string literal, or NULL if given s is None."""
if s is None:
return 'NULL'
return '"%s"' % ''.join(_CppCharEscape(c) for c in s)
def FormatWithCppEscape(format, *args):
"""Returns a string filling format with args."""
literal_list = []
for arg in args:
if isinstance(arg, (types.StringType, types.NoneType)):
arg = ToCppStringLiteral(arg)
literal_list.append(arg)
return format % tuple(literal_list)
def SkipLineComment(stream, comment_prefix='#'):
"""Skips line comments from stream."""
for line in stream:
line = line.strip()
if line and not line.startswith(comment_prefix):
yield line
def ParseColumnStream(stream, num_column=None):
"""Returns parsed columns read from stream."""
if num_column is None:
for line in stream:
yield line.split()
else:
for line in stream:
yield line.split()[:num_column]