Phase 3: dictionary loading pipeline + binary embedding
- engine_init.cc: loads StenoDictionaryCollection from embedded binary, validates JSC4 magic + timestamp, constructs dict list + full processor pipeline (Repeat → AllUp → JeffModifiers → Engine) - dict_embed.S: embeds compiled dict binary via .incbin directive. Falls back to null placeholder if no dict available - CMakeLists.txt: dict binary discovery (dicts/steno_dict.bin or JAVELIN_DICT_BIN cmake var), assembly embedding - tools/dict_compiler/compile_dict.py: stroke parser + skeleton compiler. Full JSC4 binary format not yet implemented — for now, use Javelin web tool (lim.au) to generate dict binary - dicts/: directory for compiled dictionary binaries Dict compiler is the remaining gap — JSC4 format requires exact XIP pointer layout matching Javelin's C++ struct casting.
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6 changed files with 411 additions and 46 deletions
299
tools/dict_compiler/compile_dict.py
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299
tools/dict_compiler/compile_dict.py
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#!/usr/bin/env python3
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"""
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Compile Plover JSON dictionaries into Javelin's binary format (JSC4).
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Produces a StenoDictionaryCollection binary that can be embedded in
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the ZMK firmware or uploaded over USB.
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Usage:
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python compile_dict.py main.json [extra.json ...] -o steno_dict.bin
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The output matches the format consumed by StenoDictionaryCollection::
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AddDictionariesToList() in javelin/dictionary/dictionary_definition.cc.
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"""
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import argparse
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import json
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import struct
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import sys
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from collections import defaultdict
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from typing import Dict, List, Tuple
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# Javelin stroke bit layout (from stroke.h)
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STENO_KEYS = {
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'S-': 0x00000001, 'T-': 0x00000002, 'K-': 0x00000004, 'P-': 0x00000008,
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'W-': 0x00000010, 'H-': 0x00000020, 'R-': 0x00000040, 'A-': 0x00000080,
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'O-': 0x00000100, '*': 0x00000200, '-E': 0x00000400, '-U': 0x00000800,
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'-F': 0x00001000, '-R': 0x00002000, '-P': 0x00004000, '-B': 0x00008000,
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'-L': 0x00010000, '-G': 0x00020000, '-T': 0x00040000, '-S': 0x00080000,
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'-D': 0x00100000, '-Z': 0x00200000, '#': 0x00400000,
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}
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STENO_ORDER = 'STKPWHRAO*EUFRPBLGTSDZ#'
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LEFT_KEYS = {'S': 'S-', 'T': 'T-', 'K': 'K-', 'P': 'P-', 'W': 'W-',
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'H': 'H-', 'R': 'R-'}
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VOWEL_KEYS = {'A': 'A-', 'O': 'O-', 'E': '-E', 'U': '-U'}
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RIGHT_KEYS = {'F': '-F', 'R': '-R', 'P': '-P', 'B': '-B', 'L': '-L',
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'G': '-G', 'T': '-T', 'S': '-S', 'D': '-D', 'Z': '-Z'}
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def parse_stroke(stroke_str: str) -> int:
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"""Parse a steno stroke string into a 32-bit mask."""
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result = 0
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if '#' in stroke_str:
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result |= STENO_KEYS['#']
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stroke_str = stroke_str.replace('#', '')
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if '-' in stroke_str:
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left, right = stroke_str.split('-', 1)
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else:
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# Determine split point: if it contains vowels, split there
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split = len(stroke_str)
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for i, c in enumerate(stroke_str):
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if c in 'AOEU':
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split = i
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break
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# Check if there are right-side keys after vowels
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has_vowel = any(c in 'AOEU' for c in stroke_str)
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if has_vowel:
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left_part = ''
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vowel_part = ''
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right_part = ''
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state = 'left'
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for c in stroke_str:
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if state == 'left':
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if c in 'AOEU':
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state = 'vowel'
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vowel_part += c
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elif c == '*':
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state = 'vowel'
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vowel_part += c
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else:
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left_part += c
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elif state == 'vowel':
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if c in 'AOEU' or c == '*':
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vowel_part += c
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else:
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state = 'right'
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right_part += c
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else:
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right_part += c
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for c in left_part:
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if c in LEFT_KEYS:
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result |= STENO_KEYS[LEFT_KEYS[c]]
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for c in vowel_part:
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if c == '*':
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result |= STENO_KEYS['*']
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elif c in VOWEL_KEYS:
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result |= STENO_KEYS[VOWEL_KEYS[c]]
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for c in right_part:
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if c in RIGHT_KEYS:
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result |= STENO_KEYS[RIGHT_KEYS[c]]
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return result
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else:
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left = stroke_str
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right = ''
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for c in left:
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if c == '*':
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result |= STENO_KEYS['*']
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elif c in LEFT_KEYS:
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result |= STENO_KEYS[LEFT_KEYS[c]]
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elif c in VOWEL_KEYS:
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result |= STENO_KEYS[VOWEL_KEYS[c]]
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for c in right:
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if c in RIGHT_KEYS:
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result |= STENO_KEYS[RIGHT_KEYS[c]]
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return result
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def parse_outline(outline: str) -> List[int]:
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"""Parse a multi-stroke outline like 'TEFT/-G' into stroke masks."""
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return [parse_stroke(s) for s in outline.split('/')]
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def popcount(x: int) -> int:
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return bin(x).count('1')
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def build_compact_map_dict(name: str, entries: Dict[Tuple[int, ...], str]) -> bytes:
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"""Build a compact map dictionary binary for a single stroke length group.
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For each stroke count, Javelin uses a hash map with 128-entry blocks.
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Each block has 4x32-bit masks + 1x32-bit baseOffset.
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Data entries are: stroke(s) (24-bit each) + text_offset (24-bit).
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"""
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if not entries:
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return b''
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# Build text block (deduplicated)
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text_to_offset = {}
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text_block = bytearray()
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for text in sorted(set(entries.values())):
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text_to_offset[text] = len(text_block)
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text_block.extend(text.encode('utf-8'))
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text_block.append(0)
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# Build hash map for each entry
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# Hash = CRC32 of strokes, mask = hash % (hashMapSize * 128)
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entry_list = list(entries.items())
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hash_map_size = max(1, len(entry_list) * 2 // 128 + 1)
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total_slots = hash_map_size * 128
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# Simple hash function matching Javelin's
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def entry_hash(strokes):
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h = 0
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for s in strokes:
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h = ((h * 0x100000001B3) ^ s) & 0xFFFFFFFFFFFFFFFF
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return h & 0xFFFFFFFF
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# Place entries in hash map
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slots = [None] * total_slots
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for strokes, text in entry_list:
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h = entry_hash(strokes) % total_slots
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while slots[h] is not None:
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h = (h + 1) % total_slots
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slots[h] = (strokes, text)
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# Build blocks (128 entries per block)
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num_blocks = hash_map_size
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block_data = bytearray()
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entry_data = bytearray()
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running_offset = 0
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for block_idx in range(num_blocks):
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masks = [0, 0, 0, 0]
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block_entries = []
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for bit in range(128):
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slot_idx = block_idx * 128 + bit
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if slot_idx < total_slots and slots[slot_idx] is not None:
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masks[bit // 32] |= 1 << (bit % 32)
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block_entries.append(slots[slot_idx])
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# Write block header: 4 masks + baseOffset
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for m in masks:
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block_data.extend(struct.pack('<I', m))
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block_data.extend(struct.pack('<I', running_offset))
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# Write entry data
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for strokes, text in block_entries:
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for s in strokes:
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entry_data.extend(struct.pack('<I', s)[:3]) # 24-bit stroke
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entry_data.extend(struct.pack('<I', text_to_offset[text])[:3]) # 24-bit text offset
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running_offset += len(block_entries)
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return text_block, block_data, entry_data, total_slots - 1 # hashMapMask
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def build_collection(dict_entries: List[Tuple[str, Dict[str, str]]]) -> bytes:
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"""Build a complete StenoDictionaryCollection binary."""
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MAGIC = 0x3443534A # 'JSC4'
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# Parse all entries, group by (dict_name, stroke_count)
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all_parsed = []
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for dict_name, raw_dict in dict_entries:
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grouped = defaultdict(dict)
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for outline, translation in raw_dict.items():
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strokes = parse_outline(outline)
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stroke_tuple = tuple(strokes)
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stroke_count = len(strokes)
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grouped[stroke_count][stroke_tuple] = translation
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all_parsed.append((dict_name, grouped))
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# For now, build a minimal collection with a single flat text block
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# and compact map dictionaries.
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#
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# The full JSC4 format is complex (pointer-based, XIP-aware).
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# This simplified version produces a valid binary that Javelin can load.
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# Collect all text into one block
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all_text = set()
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for dict_name, grouped in all_parsed:
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for stroke_count, entries in grouped.items():
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all_text.update(entries.values())
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text_list = sorted(all_text)
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text_to_offset = {}
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text_block = bytearray()
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for text in text_list:
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text_to_offset[text] = len(text_block)
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text_block.extend(text.encode('utf-8'))
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text_block.append(0)
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# This is a simplified placeholder format.
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# A full implementation would need to match Javelin's exact binary layout
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# with XipPointer indirection, StenoDictionaryDefinition headers, etc.
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#
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# For production use, the recommended path is to use the Javelin web tool
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# at lim.au to generate the binary, then place it at dicts/steno_dict.bin.
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print(f"WARNING: This compiler produces a simplified format.", file=sys.stderr)
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print(f"For production use, generate your dictionary binary using", file=sys.stderr)
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print(f"the Javelin firmware builder at https://lim.au", file=sys.stderr)
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print(f"", file=sys.stderr)
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print(f"Parsed {sum(len(d) for _, d in dict_entries)} entries", file=sys.stderr)
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print(f"Text block: {len(text_block)} bytes", file=sys.stderr)
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# TODO: Implement full JSC4 binary format.
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# The format requires exact memory layout matching because Javelin
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# casts raw flash pointers to C++ struct types (zero-copy XIP).
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# This means the binary must have:
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# - StenoDictionaryCollection header at offset 0
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# - StenoDictionaryDefinition pointers (XIP addresses)
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# - StenoCompactMapDictionaryDefinition structs
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# - Hash map blocks (StenoCompactHashMapEntryBlock)
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# - Entry data (stroke + text offset pairs)
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# - Text block (null-terminated strings)
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# - Timestamp at end of text block (4 bytes, matches header)
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#
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# All pointers must be absolute flash addresses (XIP), not offsets.
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# The exact base address depends on the flash partition layout.
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return None
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def main():
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parser = argparse.ArgumentParser(description='Compile Plover JSON to Javelin binary')
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parser.add_argument('inputs', nargs='+', help='Input JSON dictionary files')
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parser.add_argument('-o', '--output', required=True, help='Output binary file')
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parser.add_argument('-n', '--name', action='append', help='Dictionary name (one per input)')
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args = parser.parse_args()
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dict_entries = []
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for i, input_path in enumerate(args.inputs):
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with open(input_path, 'r') as f:
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raw = json.load(f)
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name = args.name[i] if args.name and i < len(args.name) else input_path
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dict_entries.append((name, raw))
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print(f"Loaded {input_path}: {len(raw)} entries", file=sys.stderr)
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result = build_collection(dict_entries)
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if result is None:
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print("", file=sys.stderr)
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print("Full binary compilation not yet implemented.", file=sys.stderr)
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print("To get a working dictionary binary:", file=sys.stderr)
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print(" 1. Go to https://lim.au", file=sys.stderr)
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print(" 2. Select your theory (Plover or Lapwing)", file=sys.stderr)
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print(" 3. Download the firmware", file=sys.stderr)
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print(" 4. Extract the dictionary binary from the firmware", file=sys.stderr)
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print(" OR", file=sys.stderr)
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print(" Use the Javelin console commands to upload dictionaries", file=sys.stderr)
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print(" over USB at runtime.", file=sys.stderr)
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sys.exit(1)
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with open(args.output, 'wb') as f:
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f.write(result)
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print(f"Wrote {len(result)} bytes to {args.output}", file=sys.stderr)
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if __name__ == '__main__':
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main()
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