forked from Imagelibrary/seL4
92 lines
2.9 KiB
Python
92 lines
2.9 KiB
Python
# Copyright 2022, seL4 Project a Series of LF Projects, LLC
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#
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# SPDX-License-Identifier: BSD-2-Clause or GPL-2.0-only
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#
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def remove_ws_comments(node):
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for child in list(node.childNodes):
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if child.nodeType == node.COMMENT_NODE or (child.nodeType == node.TEXT_NODE and len(child.data.strip()) == 0):
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node.removeChild(child)
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def condition_to_cpp(conditions):
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n = len(conditions)
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# Expect zero or one <condition> tag in the conditions list.
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assert n <= 1
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if n == 0:
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return ""
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remove_ws_comments(conditions[0])
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children = conditions[0].childNodes
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if not children or len(children) == 0:
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return ""
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# Expect that a condition tag has exactly one child node.
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assert len(children) == 1
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def helper(expr):
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remove_ws_comments(expr)
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if expr.tagName == "config":
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cfg_var = expr.getAttribute("var")
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if not cfg_var:
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raise Exception("Missing or empty config variable")
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return "defined({})".format(cfg_var)
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elif expr.tagName == "not":
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return "!{}".format(helper(expr.firstChild))
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else:
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op_str = {'and': ' && ', 'or': ' || '}.get(expr.tagName)
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if op_str:
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return '(' + op_str.join([helper(e) for e in expr.childNodes]) + ')'
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raise Exception("Unrecognized element `{}` in condition".format(expr.tagName))
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return helper(children[0])
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def remove_prefix(text, prefix) -> str:
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if text.startswith(prefix):
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return text[len(prefix):]
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return text
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def expr_to_bool(expr, values) -> bool:
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if expr.tagName == "and":
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for child in expr.childNodes:
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if not expr_to_bool(child, values):
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return False
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return True
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elif expr.tagName == "or":
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for child in expr.childNodes:
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if expr_to_bool(child, values):
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return True
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return False
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elif expr.tagName == "not":
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assert len(expr.childNodes) == 1
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return not expr_to_bool(expr.childNodes[0], values)
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elif expr.tagName == "config":
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cfg_var = expr.getAttribute("var")
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if not cfg_var:
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raise Exception("Missing or empty config variable")
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return values[remove_prefix(cfg_var, "CONFIG_")]
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raise Exception("Unrecognized element `{}` in condition".format(expr.tagName))
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# values to match on conditions and resolve them
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def condition_to_bool(conditions, values) -> bool:
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n = len(conditions)
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# Expect zero or one <condition> tag in the conditions list.
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assert n <= 1
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if n == 0:
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return True
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remove_ws_comments(conditions[0])
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children = conditions[0].childNodes
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if not children or len(children) == 0:
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return True
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# Expect that a condition tag has exactly one child node.
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assert len(children) == 1
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remove_ws_comments(children[0])
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return expr_to_bool(children[0], values)
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