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gen-apc-parsers.py
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gen-apc-parsers.py
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#!/usr/bin/env python3
# vim:fileencoding=utf-8
# License: GPLv3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
import subprocess
from collections import defaultdict
from typing import Any, DefaultDict, Dict, FrozenSet, List, Tuple, Union
KeymapType = Dict[str, Tuple[str, Union[FrozenSet[str], str]]]
def resolve_keys(keymap: KeymapType) -> DefaultDict[str, List[str]]:
ans: DefaultDict[str, List[str]] = defaultdict(list)
for ch, (attr, atype) in keymap.items():
if isinstance(atype, str) and atype in ('int', 'uint'):
q = atype
else:
q = 'flag'
ans[q].append(ch)
return ans
def enum(keymap: KeymapType) -> str:
lines = []
for ch, (attr, atype) in keymap.items():
lines.append(f"{attr}='{ch}'")
return '''
enum KEYS {{
{}
}};
'''.format(',\n'.join(lines))
def parse_key(keymap: KeymapType) -> str:
lines = []
for attr, atype in keymap.values():
vs = atype.upper() if isinstance(atype, str) and atype in ('uint', 'int') else 'FLAG'
lines.append(f'case {attr}: value_state = {vs}; break;')
return ' \n'.join(lines)
def parse_flag(keymap: KeymapType, type_map: Dict[str, Any], command_class: str) -> str:
lines = []
for ch in type_map['flag']:
attr, allowed_values = keymap[ch]
q = ' && '.join(f"g.{attr} != '{x}'" for x in allowed_values)
lines.append(f'''
case {attr}: {{
g.{attr} = screen->parser_buf[pos++] & 0xff;
if ({q}) {{
REPORT_ERROR("Malformed {command_class} control block, unknown flag value for {attr}: 0x%x", g.{attr});
return;
}};
}}
break;
''')
return ' \n'.join(lines)
def parse_number(keymap: KeymapType) -> Tuple[str, str]:
int_keys = [f'I({attr})' for attr, atype in keymap.values() if atype == 'int']
uint_keys = [f'U({attr})' for attr, atype in keymap.values() if atype == 'uint']
return '; '.join(int_keys), '; '.join(uint_keys)
def cmd_for_report(report_name: str, keymap: KeymapType, type_map: Dict[str, Any], payload_allowed: bool) -> str:
def group(atype: str, conv: str) -> Tuple[str, str]:
flag_fmt, flag_attrs = [], []
cv = {'flag': 'c', 'int': 'i', 'uint': 'I'}[atype]
for ch in type_map[atype]:
flag_fmt.append('s' + cv)
attr = keymap[ch][0]
flag_attrs.append(f'"{attr}", {conv}g.{attr}')
return ' '.join(flag_fmt), ', '.join(flag_attrs)
flag_fmt, flag_attrs = group('flag', '')
int_fmt, int_attrs = group('int', '(int)')
uint_fmt, uint_attrs = group('uint', '(unsigned int)')
fmt = f'{flag_fmt} {uint_fmt} {int_fmt}'
if payload_allowed:
ans = [f'REPORT_VA_COMMAND("s {{{fmt} sI}} y#", "{report_name}",']
else:
ans = [f'REPORT_VA_COMMAND("s {{{fmt}}}", "{report_name}",']
ans.append(',\n '.join((flag_attrs, uint_attrs, int_attrs)))
if payload_allowed:
ans.append(', "payload_sz", g.payload_sz, payload, g.payload_sz')
ans.append(');')
return '\n'.join(ans)
def generate(
function_name: str,
callback_name: str,
report_name: str,
keymap: KeymapType,
command_class: str,
initial_key: str = 'a',
payload_allowed: bool = True
) -> str:
type_map = resolve_keys(keymap)
keys_enum = enum(keymap)
handle_key = parse_key(keymap)
flag_keys = parse_flag(keymap, type_map, command_class)
int_keys, uint_keys = parse_number(keymap)
report_cmd = cmd_for_report(report_name, keymap, type_map, payload_allowed)
if payload_allowed:
payload_after_value = "case ';': state = PAYLOAD; break;"
payload = ', PAYLOAD'
parr = 'static uint8_t payload[4096];'
payload_case = f'''
case PAYLOAD: {{
sz = screen->parser_buf_pos - pos;
const char *err = base64_decode(screen->parser_buf + pos, sz, payload, sizeof(payload), &g.payload_sz);
if (err != NULL) {{ REPORT_ERROR("Failed to parse {command_class} command payload with error: %s", err); return; }}
pos = screen->parser_buf_pos;
}}
break;
'''
callback = f'{callback_name}(screen, &g, payload)'
else:
payload_after_value = payload = parr = payload_case = ''
callback = f'{callback_name}(screen, &g)'
return f'''
static inline void
{function_name}(Screen *screen, PyObject UNUSED *dump_callback) {{
unsigned int pos = 1;
enum PARSER_STATES {{ KEY, EQUAL, UINT, INT, FLAG, AFTER_VALUE {payload} }};
enum PARSER_STATES state = KEY, value_state = FLAG;
static {command_class} g;
unsigned int i, code;
uint64_t lcode;
bool is_negative;
memset(&g, 0, sizeof(g));
size_t sz;
{parr}
{keys_enum}
enum KEYS key = '{initial_key}';
if (screen->parser_buf[pos] == ';') state = AFTER_VALUE;
while (pos < screen->parser_buf_pos) {{
switch(state) {{
case KEY:
key = screen->parser_buf[pos++];
state = EQUAL;
switch(key) {{
{handle_key}
default:
REPORT_ERROR("Malformed {command_class} control block, invalid key character: 0x%x", key);
return;
}}
break;
case EQUAL:
if (screen->parser_buf[pos++] != '=') {{
REPORT_ERROR("Malformed {command_class} control block, no = after key, found: 0x%x instead", screen->parser_buf[pos-1]);
return;
}}
state = value_state;
break;
case FLAG:
switch(key) {{
{flag_keys}
default:
break;
}}
state = AFTER_VALUE;
break;
case INT:
#define READ_UINT \\
for (i = pos; i < MIN(screen->parser_buf_pos, pos + 10); i++) {{ \\
if (screen->parser_buf[i] < '0' || screen->parser_buf[i] > '9') break; \\
}} \\
if (i == pos) {{ REPORT_ERROR("Malformed {command_class} control block, expecting an integer value for key: %c", key & 0xFF); return; }} \\
lcode = utoi(screen->parser_buf + pos, i - pos); pos = i; \\
if (lcode > UINT32_MAX) {{ REPORT_ERROR("Malformed {command_class} control block, number is too large"); return; }} \\
code = lcode;
is_negative = false;
if(screen->parser_buf[pos] == '-') {{ is_negative = true; pos++; }}
#define I(x) case x: g.x = is_negative ? 0 - (int32_t)code : (int32_t)code; break
READ_UINT;
switch(key) {{
{int_keys};
default: break;
}}
state = AFTER_VALUE;
break;
#undef I
case UINT:
READ_UINT;
#define U(x) case x: g.x = code; break
switch(key) {{
{uint_keys};
default: break;
}}
state = AFTER_VALUE;
break;
#undef U
#undef READ_UINT
case AFTER_VALUE:
switch (screen->parser_buf[pos++]) {{
default:
REPORT_ERROR("Malformed {command_class} control block, expecting a comma or semi-colon after a value, found: 0x%x",
screen->parser_buf[pos - 1]);
return;
case ',':
state = KEY;
break;
{payload_after_value}
}}
break;
{payload_case}
}} // end switch
}} // end while
switch(state) {{
case EQUAL:
REPORT_ERROR("Malformed {command_class} control block, no = after key"); return;
case INT:
case UINT:
REPORT_ERROR("Malformed {command_class} control block, expecting an integer value"); return;
case FLAG:
REPORT_ERROR("Malformed {command_class} control block, expecting a flag value"); return;
default:
break;
}}
{report_cmd}
{callback};
}}
'''
def write_header(text: str, path: str) -> None:
with open(path, 'w') as f:
print(f'// This file is generated by {__file__} do not edit!', file=f, end='\n\n')
print('#pragma once', file=f)
print(text, file=f)
subprocess.check_call(['clang-format', '-i', path])
def graphics_parser() -> None:
flag = frozenset
keymap: KeymapType = {
'a': ('action', flag('tTqpdfa')),
'd': ('delete_action', flag('aAiIcCfFnNpPqQxXyYzZ')),
't': ('transmission_type', flag('dfts')),
'o': ('compressed', flag('z')),
'f': ('format', 'uint'),
'm': ('more', 'uint'),
'i': ('id', 'uint'),
'I': ('image_number', 'uint'),
'p': ('placement_id', 'uint'),
'q': ('quiet', 'uint'),
'w': ('width', 'uint'),
'h': ('height', 'uint'),
'x': ('x_offset', 'uint'),
'y': ('y_offset', 'uint'),
'v': ('data_height', 'uint'),
's': ('data_width', 'uint'),
'S': ('data_sz', 'uint'),
'O': ('data_offset', 'uint'),
'c': ('num_cells', 'uint'),
'r': ('num_lines', 'uint'),
'X': ('cell_x_offset', 'uint'),
'Y': ('cell_y_offset', 'uint'),
'z': ('z_index', 'int'),
'C': ('cursor_movement', 'uint'),
}
text = generate('parse_graphics_code', 'screen_handle_graphics_command', 'graphics_command', keymap, 'GraphicsCommand')
write_header(text, 'kitty/parse-graphics-command.h')
graphics_parser()