trezor-firmware/rust/trezor-client/scripts/build_messages

#!/usr/bin/env python3

# Generates the `trezor_message_impl!` macro calls for the `src/messages/mod.rs` file.

from os import path

# Path to the `messages.proto` file
PATH = path.abspath(path.join(__file__, "../../../../common/protob/messages.proto"))
# Prefix of the enum variants
PREFIX = "MessageType_"
# Mapping of block name to feature name
FEATURES = {
    # no features
    "Management": "default",
    "Bootloader": "default",
    "Crypto": "default",
    "Debug": "default",
    #
    "Bitcoin": "bitcoin",
    "Ethereum": "ethereum",
    #
    "Binance": "binance",
    "Cardano": "cardano",
    "EOS": "eos",
    "Monero": "monero",
    "NEM": "nem",
    "Ripple": "ripple",
    "Stellar": "stellar",
    "Tezos": "tezos",
    "WebAuthn": "webauthn",
}
MACRO = "trezor_message_impl"
INDENT = "    "


def main():
    blocks = get_blocks()
    features = {}
    defaults = []
    for block, variants in blocks.items():
        f = FEATURES.get(block)
        if not f or f == "default":
            defaults.extend(variants)
        else:
            vs = features.get(f)
            if vs:
                vs.extend(variants)
            else:
                features[f] = variants

    items = list(features.items())
    items.sort()

    out = write_block(defaults)
    for feature, variants in items:
        if variants and feature:
            out += "\n"
            out += write_block(variants, feature)
    print(out.strip())


# Parse feature blocks based on comments in the `messages.proto` file
def get_blocks() -> dict[str, list[str]]:
    blocks = {}
    current_block = ""
    with open(PATH, "r") as file:
        in_enum = False
        in_block_comment = False
        for line in file:
            line = line.strip()

            if "/*" in line:
                in_block_comment = True
            if "*/" in line:
                in_block_comment = False
            if in_block_comment:
                continue

            if line.startswith("enum MessageType {"):
                in_enum = True
                continue
            if in_enum:
                if line == "}":
                    break
                if line.startswith("//"):
                    comment = line.removeprefix("//").strip()
                    if comment[0].isupper() and len(comment.split(" ")) == 1:
                        current_block = comment
                        blocks[current_block] = []
                elif line.startswith(PREFIX):
                    blocks[current_block].append(line.split(" ")[0])
    return blocks


# Writes a macro block
def write_block(variants: list[str], feature: str = "") -> str:
    s = ""
    if feature:
        s += f'#[cfg(feature = "{feature}")]\n'
    s += f"{MACRO}! {{\n"
    for variant in variants:
        s += f"{INDENT}{variant.removeprefix(PREFIX)} => {variant},\n"
    s += "}\n"
    return s


if __name__ == "__main__":
    main()