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#!/usr/bin/env python3
#
# Copyright 2001 Google Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Simple web server for browsing dependency graph data.

This script is inlined into the final executable and spawned by
it when needed.
"""

try:
    import http.server as httpserver
    import socketserver
except ImportError:
    import BaseHTTPServer as httpserver
    import SocketServer as socketserver
import argparse
import os
import socket
import subprocess
import sys
import webbrowser

if sys.version_info >= (3, 2):
    from html import escape
else:
    from cgi import escape
try:
    from urllib.request import unquote
except ImportError:
    from urllib2 import unquote
from collections import namedtuple

Node = namedtuple("Node", ["inputs", "rule", "target", "outputs"])

# Ideally we'd allow you to navigate to a build edge or a build node,
# with appropriate views for each.  But there's no way to *name* a build
# edge so we can only display nodes.
#
# For a given node, it has at most one input edge, which has n
# different inputs.  This becomes node.inputs.  (We leave out the
# outputs of the input edge due to what follows.)  The node can have
# multiple dependent output edges.  Rather than attempting to display
# those, they are summarized by taking the union of all their outputs.
#
# This means there's no single view that shows you all inputs and outputs
# of an edge.  But I think it's less confusing than alternatives.


def match_strip(line, prefix):
    if not line.startswith(prefix):
        return (False, line)
    return (True, line[len(prefix) :])


def html_escape(text):
    return escape(text, quote=True)


def parse(text):
    lines = iter(text.split("\n"))

    target = None
    rule = None
    inputs = []
    outputs = []

    try:
        target = next(lines)[:-1]  # strip trailing colon

        line = next(lines)
        (match, rule) = match_strip(line, "  input: ")
        if match:
            (match, line) = match_strip(next(lines), "    ")
            while match:
                type = None
                (match, line) = match_strip(line, "| ")
                if match:
                    type = "implicit"
                (match, line) = match_strip(line, "|| ")
                if match:
                    type = "order-only"
                inputs.append((line, type))
                (match, line) = match_strip(next(lines), "    ")

        match, _ = match_strip(line, "  outputs:")
        if match:
            (match, line) = match_strip(next(lines), "    ")
            while match:
                outputs.append(line)
                (match, line) = match_strip(next(lines), "    ")
    except StopIteration:
        pass

    return Node(inputs, rule, target, outputs)


def create_page(body):
    return (
        """<!DOCTYPE html>
<style>
body {
    font-family: sans;
    font-size: 0.8em;
    margin: 4ex;
}
h1 {
    font-weight: normal;
    font-size: 140%;
    text-align: center;
    margin: 0;
}
h2 {
    font-weight: normal;
    font-size: 120%;
}
tt {
    font-family: WebKitHack, monospace;
    white-space: nowrap;
}
.filelist {
  -webkit-columns: auto 2;
}
</style>
"""
        + body
    )


def generate_html(node):
    document = ["<h1><tt>%s</tt></h1>" % html_escape(node.target)]

    if node.inputs:
        document.append("<h2>target is built using rule <tt>%s</tt> of</h2>" % html_escape(node.rule))
        if len(node.inputs) > 0:
            document.append("<div class=filelist>")
            for input, type in sorted(node.inputs):
                extra = ""
                if type:
                    extra = " (%s)" % html_escape(type)
                document.append(
                    '<tt><a href="?%s">%s</a>%s</tt><br>' % (html_escape(input), html_escape(input), extra)
                )
            document.append("</div>")

    if node.outputs:
        document.append("<h2>dependent edges build:</h2>")
        document.append("<div class=filelist>")
        for output in sorted(node.outputs):
            document.append('<tt><a href="?%s">%s</a></tt><br>' % (html_escape(output), html_escape(output)))
        document.append("</div>")

    return "\n".join(document)


def ninja_dump(target):
    cmd = [args.ninja_command, "-f", args.f, "-t", "query", target]
    proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, universal_newlines=True)
    return proc.communicate() + (proc.returncode,)


class RequestHandler(httpserver.BaseHTTPRequestHandler):
    def do_GET(self):
        assert self.path[0] == "/"
        target = unquote(self.path[1:])

        if target == "":
            self.send_response(302)
            self.send_header("Location", "?" + args.initial_target)
            self.end_headers()
            return

        if not target.startswith("?"):
            self.send_response(404)
            self.end_headers()
            return
        target = target[1:]

        ninja_output, ninja_error, exit_code = ninja_dump(target)
        if exit_code == 0:
            page_body = generate_html(parse(ninja_output.strip()))
        else:
            # Relay ninja's error message.
            page_body = "<h1><tt>%s</tt></h1>" % html_escape(ninja_error)

        self.send_response(200)
        self.end_headers()
        self.wfile.write(create_page(page_body).encode("utf-8"))

    def log_message(self, format, *args):
        pass  # Swallow console spam.


parser = argparse.ArgumentParser(prog="ninja -t browse")
parser.add_argument("--port", "-p", default=8000, type=int, help="Port number to use (default %(default)d)")
parser.add_argument(
    "--hostname", "-a", default="localhost", type=str, help="Hostname to bind to (default %(default)s)"
)
parser.add_argument("--no-browser", action="store_true", help="Do not open a webbrowser on startup.")

parser.add_argument("--ninja-command", default="ninja", help="Path to ninja binary (default %(default)s)")
parser.add_argument("-f", default="build.ninja", help="Path to build.ninja file (default %(default)s)")
parser.add_argument("initial_target", default="all", nargs="?", help="Initial target to show (default %(default)s)")


class HTTPServer(socketserver.ThreadingMixIn, httpserver.HTTPServer):
    # terminate server immediately when Python exits.
    daemon_threads = True


args = parser.parse_args()
port = args.port
hostname = args.hostname
httpd = HTTPServer((hostname, port), RequestHandler)
try:
    if hostname == "":
        hostname = socket.gethostname()
    print("Web server running on %s:%d, ctl-C to abort..." % (hostname, port))
    print("Web server pid %d" % os.getpid(), file=sys.stderr)
    if not args.no_browser:
        webbrowser.open_new("http://%s:%s" % (hostname, port))
    httpd.serve_forever()
except KeyboardInterrupt:
    print()
    pass  # Swallow console spam.