#!/usr/bin/env fuchsia-vendored-python

# Copyright 2016 The Fuchsia Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# A tool for autogenerating the mapping between Status and zx_status_t
# Usage: python gen_status.py zircon/system/public/zircon/errors.h {sys,enum,match}
import re
import sys

status_re = re.compile("#define\s+(ZX_\w+)\s+\((\-?\d+)\)$")


def parse(in_filename):
    result = []
    for line in open(in_filename):
        m = status_re.match(line)
        if m:
            result.append((m.group(1), int(m.group(2))))
    return result


def to_snake_case(name):
    result = []
    for element in name.split("_"):
        result.append(element[0] + element[1:].lower())
    return "".join(result)


def out(style, l):
    print("// Auto-generated using tools/gen_status.py")
    longest = max(len(name) for (name, num) in l)
    if style == "sys":
        for name, num in l:
            print(
                "pub const %s : zx_status_t = %d;" % (name.ljust(longest), num)
            )
    if style == "enum":
        print("pub enum Status {")
        for name, num in l:
            print("    %s = %d," % (to_snake_case(name[3:]), num))
        print("")
        print(
            "    /// Any zx_status_t not in the set above will map to the following:"
        )
        print("    UnknownOther = -32768,")
        print("}")
    if style == "match":
        for name, num in l:
            print(
                "            sys::%s => Status::%s,"
                % (name, to_snake_case(name[3:]))
            )
        print("            _ => Status::UnknownOther,")


l = parse(sys.argv[1])
out(sys.argv[2], l)