Tasmota/tools/lv_berry/preprocessor.py

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import re
import sys
import glob
# https://stackoverflow.com/a/241506
def comment_remover(text):
def replacer(match):
s = match.group(0)
if s.startswith('/'):
return " " # note: a space and not an empty string
else:
return s
pattern = re.compile(
r'//.*?$|/\*.*?\*/|\'(?:\\.|[^\\\'])*\'|"(?:\\.|[^\\"])*"',
re.DOTALL | re.MULTILINE
)
return re.sub(pattern, replacer, text)
lv_src_prefix = "../../lib/libesp32_lvgl/LVGL/src/"
# find all headers
headers_names = glob.glob(lv_src_prefix + "**/*.h", recursive=True)
def clean_source(raw):
raw = comment_remover(raw) # remove comments
# convert cr/lf or cr to lf
raw = re.sub('\r\n ', '\n', raw)
raw = re.sub('\r', '\n', raw)
# group multilines into a single line, i.e. if line ends with '\', put in a single line
raw = re.sub('\\\\\n', ' ', raw)
# remove preprocessor directives
raw = re.sub('\n[ \t]*#[^\n]*(?=\n)', '', raw)
raw = re.sub('^[ \t]*#[^\n]*\n', '', raw)
raw = re.sub('\n[ \t]*#[^\n]*$', '', raw)
# remove extern "C" {}
raw = re.sub('extern\s+"C"\s+{(.*)}', '\\1', raw, flags=re.DOTALL)
# remove empty lines
raw = re.sub('\n[ \t]*(?=\n)', '', raw)
raw = re.sub('^[ \t]*\n', '', raw) # remove first empty line
raw = re.sub('\n[ \t]*$', '', raw) # remove last empty line
return raw
# ################################################################################
# Parse 'enum'
# ################################################################################
output_filename = "lv_enum.h"
sys.stdout = open(output_filename, 'w')
print("""
// LV Colors - we store in 24 bits format and will convert at runtime
// This is specific treatment because we keep colors in 24 bits format
COLOR_WHITE=0xFFFFFF
COLOR_SILVER=0xC0C0C0
COLOR_GRAY=0x808080
COLOR_BLACK=0x000000
COLOR_RED=0xFF0000
COLOR_MAROON=0x800000
COLOR_YELLOW=0xFFFF00
COLOR_OLIVE=0x808000
COLOR_LIME=0x00FF00
COLOR_GREEN=0x008000
COLOR_CYAN=0x00FFFF
COLOR_AQUA=0x00FFFF
COLOR_TEAL=0x008080
COLOR_BLUE=0x0000FF
COLOR_NAVY=0x000080
COLOR_MAGENTA=0xFF00FF
COLOR_PURPLE=0x800080
// following are #define, not enum
LV_RADIUS_CIRCLE
LV_TEXTAREA_CURSOR_LAST
LV_STYLE_PROP_ALL
""")
# unit test
#headers_names = [ '../../lib/libesp32_lvgl/LVGL/src/lv_widgets/lv_btn.h' ]
#headers_names = [ '../../lib/libesp32_lvgl/LVGL/src/lv_core/lv_style.h' ]
#
for header_name in headers_names:
with open(header_name) as f:
raw = clean_source(f.read())
# extract enums
enums = re.findall('enum\s+{(.*?)}', raw, flags=re.DOTALL)
for enum in enums: # iterate on all matches
# remove enums defined via a macro
enum = re.sub('\S+\((.*?),.*?\),', '\\1,', enum) # turn 'LV_STYLE_PROP_INIT(LV_STYLE_SIZE, 0x0, LV_STYLE_ID_VALUE + 3, LV_STYLE_ATTR_NONE),' into 'LV_STYLE_SIZE'
#
enum_elt = enum.split(",")
for enum_item in enum_elt:
# remove any space
enum_item = re.sub('[ \t\n]', '', enum_item)
# remove anything after '='
enum_item = re.sub('=.*$', '', enum_item)
# item is ready
exclude = False
for exclude_prefix in ["_", "LV_BIDI_DIR_", "LV_FONT_", "LV_IMG_CF_RESERVED_", "LV_IMG_CF_USER_",
"LV_SIGNAL_", "LV_TEMPL_", "LV_TASK_PRIO_", "LV_THEME_", "LV_KEYBOARD_MODE_TEXT_ARABIC"]:
if enum_item.startswith(exclude_prefix): exclude = True
if exclude: continue
print(enum_item)
sys.stdout.close()