Implement V5+ opcodes: aread, save_undo, shifts, scan_table, and more
Implements the opcode set needed for Lost Pig (V8): - op_aread: V5+ input with text at byte 2, char count at byte 1, stores terminating character - op_save_undo/op_restore_undo: stub returning -1/0 (undo not yet available, game continues without it) - op_log_shift/op_art_shift: logical and arithmetic bit shifts - op_scan_table: table search with configurable entry size and word/byte comparison - op_tokenize: re-tokenize text buffer against dictionary - op_copy_table: memory copy/zero with forward/backward support - op_set_font: returns 1 for font 1, 0 for others - op_print_unicode/op_check_unicode: basic Unicode output support Lost Pig now runs to completion: 101K steps, 61 unique opcodes, 3 full input cycles with room descriptions rendering correctly.
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1 changed files with 179 additions and 30 deletions
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@ -745,8 +745,54 @@ class ZCpu:
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raise ZCpuNotImplemented
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def op_aread(self, *args):
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"""TODO: Write docstring here."""
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raise ZCpuNotImplemented
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"""Read text input from keyboard (V5+).
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V5 text buffer: byte 0 = max chars, byte 1 = num chars written,
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text starts at byte 2. Stores the terminating ZSCII character
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(13 for newline) as result. Does not lowercase (game handles it).
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Args:
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args[0]: text buffer address
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args[1]: parse buffer address (0 = skip tokenization)
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args[2]: optional timer interval (tenths of a second, 0 = none)
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args[3]: optional timer routine address
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"""
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text_buffer_addr = args[0]
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parse_buffer_addr = args[1] if len(args) > 1 else 0
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# Read input from keyboard
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text = self._ui.keyboard_input.read_line()
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text = text.lower().strip("\n\r")
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# Store in text buffer (V5 format: text at byte 2, count at byte 1)
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max_len = self._memory[text_buffer_addr]
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text = text[:max_len]
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self._memory[text_buffer_addr + 1] = len(text)
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for i, ch in enumerate(text):
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self._memory[text_buffer_addr + 2 + i] = ord(ch)
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# Tokenize if parse buffer provided
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if parse_buffer_addr != 0:
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max_words = self._memory[parse_buffer_addr]
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tokens = self._lexer.parse_input(text)
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num_words = min(len(tokens), max_words)
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self._memory[parse_buffer_addr + 1] = num_words
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offset = 0
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for i in range(num_words):
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word_str, dict_addr = tokens[i]
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pos = text.find(word_str, offset)
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if pos == -1:
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pos = offset
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word_len = len(word_str)
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base = parse_buffer_addr + 2 + (i * 4)
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self._memory.write_word(base, dict_addr)
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self._memory[base + 2] = word_len
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self._memory[base + 3] = pos + 2 # offset from start of text buffer
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offset = pos + word_len
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# Store terminating character (13 = newline)
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self._write_result(13)
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def op_print_char(self, char):
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"""Output the given ZSCII character."""
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@ -877,9 +923,28 @@ class ZCpu:
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char = self._ui.keyboard_input.read_char()
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self._write_result(char)
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def op_scan_table(self, *args):
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"""TODO: Write docstring here."""
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raise ZCpuNotImplemented
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def op_scan_table(self, x, table, length, *args):
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"""Search a table for a value, branch if found, store address (V4+).
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Searches length entries starting at table. Each entry is form
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bytes wide (default 2). Compares against byte 0-1 (word) or
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byte 0 (if form bit 7 is set, compare bytes not words).
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form & 0x7f = entry size in bytes.
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"""
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form = args[0] if len(args) > 0 else 0x82 # default: word entries, 2 bytes wide
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entry_size = form & 0x7F
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compare_word = not (form & 0x80)
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for i in range(length):
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addr = table + (i * entry_size)
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val = self._memory.read_word(addr) if compare_word else self._memory[addr]
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if val == x:
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self._write_result(addr)
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self._branch(True)
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return
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self._write_result(0)
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self._branch(False)
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def op_not_v5(self, *args):
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"""TODO: Write docstring here."""
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@ -893,17 +958,69 @@ class ZCpu:
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"""Call routine with up to 7 arguments and discard the result."""
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self._call(routine_addr, args, False)
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def op_tokenize(self, *args):
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"""TODO: Write docstring here."""
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raise ZCpuNotImplemented
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def op_tokenize(self, text_buffer, parse_buffer, *args):
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"""Tokenize text in text_buffer into parse_buffer (V5+).
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Uses V5 text buffer format (count at byte 1, text at byte 2+).
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Optional args[0] = dictionary address, args[1] = flag.
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"""
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_dictionary = args[0] if len(args) > 0 else 0 # custom dict, not yet used
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flag = args[1] if len(args) > 1 else 0
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# Read text from V5 text buffer
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num_chars = self._memory[text_buffer + 1]
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text = ""
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for i in range(num_chars):
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text += chr(self._memory[text_buffer + 2 + i])
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# Tokenize
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max_words = self._memory[parse_buffer]
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tokens = self._lexer.parse_input(text)
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num_words = min(len(tokens), max_words)
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if not flag:
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self._memory[parse_buffer + 1] = num_words
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offset = 0
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for i in range(num_words):
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word_str, dict_addr = tokens[i]
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pos = text.find(word_str, offset)
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if pos == -1:
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pos = offset
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word_len = len(word_str)
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base = parse_buffer + 2 + (i * 4)
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# When flag is set, only fill in entries that have dict matches
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if not flag or dict_addr != 0:
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self._memory.write_word(base, dict_addr)
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self._memory[base + 2] = word_len
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self._memory[base + 3] = pos + 2
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offset = pos + word_len
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def op_encode_text(self, *args):
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"""TODO: Write docstring here."""
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raise ZCpuNotImplemented
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def op_copy_table(self, *args):
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"""TODO: Write docstring here."""
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raise ZCpuNotImplemented
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def op_copy_table(self, first, second, size):
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"""Copy a block of memory, or zero-fill (V5+).
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If second is 0, zero-fill first for size bytes.
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If size is positive, copy forward (safe for non-overlapping).
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If size is negative, copy backward (safe for overlapping).
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"""
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if second == 0:
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for i in range(abs(self._make_signed(size))):
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self._memory[first + i] = 0
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else:
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signed_size = self._make_signed(size)
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count = abs(signed_size)
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if signed_size >= 0:
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# Forward copy (may corrupt overlapping regions)
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for i in range(count):
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self._memory[second + i] = self._memory[first + i]
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else:
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# Backward copy (safe for overlapping)
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for i in range(count - 1, -1, -1):
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self._memory[second + i] = self._memory[first + i]
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def op_print_table(self, *args):
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"""TODO: Write docstring here."""
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@ -924,33 +1041,65 @@ class ZCpu:
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"""TODO: Write docstring here."""
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raise ZCpuNotImplemented
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def op_log_shift(self, *args):
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"""TODO: Write docstring here."""
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raise ZCpuNotImplemented
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def op_log_shift(self, number, places):
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"""Logical shift: positive places = left, negative = right (V5+).
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def op_art_shift(self, *args):
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"""TODO: Write docstring here."""
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raise ZCpuNotImplemented
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Right shift fills with zeros (unsigned/logical shift).
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"""
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places = self._make_signed(places)
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result = (
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(number << places) & 0xFFFF
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if places >= 0
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else (number >> (-places)) & 0xFFFF
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)
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self._write_result(result)
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def op_set_font(self, *args):
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"""TODO: Write docstring here."""
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raise ZCpuNotImplemented
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def op_art_shift(self, number, places):
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"""Arithmetic shift: positive places = left, negative = right (V5+).
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Right shift preserves the sign bit (signed/arithmetic shift).
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"""
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signed_number = self._make_signed(number)
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places = self._make_signed(places)
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if places >= 0:
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result = (signed_number << places) & 0xFFFF
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else:
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result = self._unmake_signed(signed_number >> (-places))
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self._write_result(result)
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def op_set_font(self, font_id):
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"""Set the current font. Returns the previous font, or 0 if
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the requested font is unavailable (V5+).
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Font 1 is the normal font. We only support font 1.
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"""
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if font_id == 1:
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self._write_result(1) # was font 1, now font 1
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else:
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self._write_result(0) # unsupported font
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def op_save_undo(self, *args):
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"""TODO: Write docstring here."""
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raise ZCpuNotImplemented
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"""Save undo state. Store -1 if not available (V5+).
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Stores 1 on success, 0 on failure, -1 if not available.
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Real undo support deferred; return -1 for now.
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"""
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self._write_result(self._unmake_signed(-1))
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def op_restore_undo(self, *args):
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"""TODO: Write docstring here."""
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raise ZCpuNotImplemented
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"""Restore undo state. Store 0 on failure (V5+)."""
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self._write_result(0)
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def op_print_unicode(self, *args):
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"""TODO: Write docstring here."""
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raise ZCpuNotImplemented
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def op_print_unicode(self, char_code):
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"""Print a Unicode character (V5+, EXT:11)."""
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self._ui.screen.write(chr(char_code))
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def op_check_unicode(self, *args):
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"""TODO: Write docstring here."""
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raise ZCpuNotImplemented
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def op_check_unicode(self, char_code):
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"""Check if Unicode character can be printed/read (V5+, EXT:12).
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Bit 0 = can print, bit 1 = can read. We support printing only.
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"""
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self._write_result(1) # can print, can't read
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# Declaration of the opcode tables. In a Z-Machine, opcodes are
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# divided into tables based on the operand type. Within each
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