Getting a bit closer.
Chris Pressey
9 years ago
| 101 | 101 |
return (ord(s[0]), s[1:])
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| 102 | 102 |
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| 103 | 103 |
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104 |
def scan_line_number(s):
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105 |
acc = []
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106 |
while s and s[0].isdigit():
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107 |
acc.append(s[0])
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108 |
s = s[1:]
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109 |
return (int(''.join(acc)), s)
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110 |
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111 |
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| 104 | 112 |
def tokenize(s):
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| 105 | |
# TODO: strip the line number off the front, return as an int
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113 |
(line_number, s) = scan_line_number(s)
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| 106 | 114 |
bytes = []
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| 107 | 115 |
while s:
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| 108 | 116 |
(byte, s) = scan(s)
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| 109 | 117 |
bytes.append(byte)
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| 110 | |
return (999, bytes)
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118 |
return (line_number, bytes)
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119 |
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120 |
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121 |
def write_word(f, word):
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122 |
"""f being a file-like object, word being an integer 0-65535"""
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123 |
low = word & 255
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124 |
high = (word >> 8) & 255
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125 |
f.write(chr(low) + chr(high))
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| 111 | 126 |
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| 112 | 127 |
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| 113 | 128 |
class TokenizedLine(object):
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| 123 | 138 |
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| 124 | 139 |
def write_to(self, f):
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| 125 | 140 |
"""f being a file-like object"""
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| 126 | |
assert self.next_addr is not None
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| 127 | |
# TODO: write line number in binary
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| 128 | |
# TODO: write next_addr in binary
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141 |
#assert self.next_addr is not None
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142 |
write_word(f, 0) # TODO make this the next_addr
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143 |
write_word(f, self.line_number)
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| 129 | 144 |
for byte in self.bytes:
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| 130 | 145 |
f.write(chr(byte))
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| 131 | 146 |
f.write(chr(0))
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| 148 | 163 |
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| 149 | 164 |
outfile = sys.stdout
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| 150 | 165 |
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| 151 | |
sys.write(outfile, chr(1) + chr(8)) # TODO: write helper for this
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166 |
write_word(outfile, start_addr)
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| 152 | 167 |
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| 153 | 168 |
for tokenized_line in tokenized_lines:
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| 154 | 169 |
tokenized_line.write_to(outfile)
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