Beginning of Scanner objects.
Chris Pressey
7 years ago
| 187 | 187 | if key in self.mmap_register: |
| 188 | 188 | self.mmap_register[key].write(value) |
| 189 | 189 | self.storage_register[key] = value |
| 190 | ||
| 191 | ||
| 192 | class Scanner(object): | |
| 193 | def __init__(self, line): | |
| 194 | self.line = line | |
| 195 | ||
| 196 | def scan_integer(self): | |
| 197 | number = 0 | |
| 198 | if not self.line or not self.line[0].isdigit(): | |
| 199 | raise SyntaxError('Expected integer') | |
| 200 | while self.line and self.line[0].isdigit(): | |
| 201 | number = number * 10 + (ord(line[0]) - ord('0')) | |
| 202 | self.line = self.line[1:] | |
| 203 | return number | |
| 204 | ||
| 205 | def scan_register(self): | |
| 206 | if not self.line or self.line[0] != 'R': | |
| 207 | raise SyntaxError('Expected R') | |
| 208 | self.line = self.line[1:] | |
| 209 | if not self.line: | |
| 210 | raise SyntaxError('Expected register designator') | |
| 211 | if self.line[0] == '[': | |
| 212 | pass # ... | |
| 213 | else: | |
| 214 | regnum = self.scan_integer() | |
| 215 | return ('direct', regnum) | |
| 190 | 216 | |
| 191 | 217 | |
| 192 | 218 | class Instruction(object): |