Function EvalSingleCondition

tools/gyp/pylib/gyp/input.py:1157–1197

Returns true_dict if cond_expr evaluates to true, and false_dict otherwise.

(cond_expr, true_dict, false_dict, phase, variables, build_file)

def EvalSingleCondition(cond_expr, true_dict, false_dict, phase, variables, build_file):
    """Returns true_dict if cond_expr evaluates to true, and false_dict
    otherwise."""
    # Do expansions on the condition itself.  Since the condition can naturally
    # contain variable references without needing to resort to GYP expansion
    # syntax, this is of dubious value for variables, but someone might want to
    # use a command expansion directly inside a condition.
    cond_expr_expanded = ExpandVariables(cond_expr, phase, variables, build_file)
    if type(cond_expr_expanded) not in (str, int):
        raise ValueError(
            "Variable expansion in this context permits str and int "
            + "only, found "
            + cond_expr_expanded.__class__.__name__
        )

    try:
        if cond_expr_expanded in cached_conditions_asts:
            ast_code = cached_conditions_asts[cond_expr_expanded]
        else:
            ast_code = compile(cond_expr_expanded, "<string>", "eval")
            cached_conditions_asts[cond_expr_expanded] = ast_code
        env = {"__builtins__": {}, "v": Version}
        if eval(ast_code, env, variables):
            return true_dict
        return false_dict
    except SyntaxError as e:
        syntax_error = SyntaxError(
            "%s while evaluating condition '%s' in %s "
            "at character %d." % (str(e.args[0]), e.text, build_file, e.offset),
            e.filename,
            e.lineno,
            e.offset,
            e.text,
        )
        raise syntax_error
    except NameError as e:
        gyp.common.ExceptionAppend(
            e,
            f"while evaluating condition '{cond_expr_expanded}' in {build_file}",
        )
        raise GypError(e)


def ProcessConditionsInDict(the_dict, phase, variables, build_file):