blob: 068bc04f9ca2f36fe7d5b78efc109f17a0f0c8b3 [file] [log] [blame]
# -*- coding: utf-8 -*-
# Copyright 2012 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
# pylint: disable=bad-continuation,docstring-second-line-blank,redefined-builtin
"""Compile logic copied from upstream gyp.input module.
None of this is written by Chromium OS. We have a copy here so people don't
have to install a copy of gyp itself in their system.
Last synced from:
from __future__ import print_function
import ast
class GypError(Exception):
"""Error class representing an error, which is to be presented
to the user. The main entry point will catch and display this.
def CheckedEval(file_contents):
"""Return the eval of a gyp file.
The gyp file is restricted to dictionaries and lists only, and
repeated keys are not allowed.
Note that this is slower than eval() is.
syntax_tree = ast.parse(file_contents)
assert isinstance(syntax_tree, ast.Module)
c1 = syntax_tree.body
assert len(c1) == 1
c2 = c1[0]
assert isinstance(c2, ast.Expr)
return CheckNode(c2.value, [])
def CheckNode(node, keypath):
if isinstance(node, ast.Dict):
dict = {}
for key, value in zip(node.keys, node.values):
assert isinstance(key, ast.Str)
key = key.s
if key in dict:
raise GypError("Key '" + key + "' repeated at level " +
repr(len(keypath) + 1) + " with key path '" +
'.'.join(keypath) + "'")
kp = list(keypath) # Make a copy of the list for descending this node.
dict[key] = CheckNode(value, kp)
return dict
elif isinstance(node, ast.List):
children = []
for index, child in enumerate(node.elts):
kp = list(keypath) # Copy list.
children.append(CheckNode(child, kp))
return children
elif isinstance(node, ast.Str):
return node.s
raise TypeError("Unknown AST node at key path '" + '.'.join(keypath) +
"': " + repr(node))