75 lines
2.3 KiB
Python
75 lines
2.3 KiB
Python
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import os.path
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from collections import OrderedDict
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import execjs.runtime_names as runtime_names
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import execjs._external_runtime as external_runtime
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import execjs._pyv8runtime as pyv8runtime
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import execjs._exceptions as exceptions
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def register(name, runtime):
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'''Register a JavaScript runtime.'''
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_runtimes.append((name, runtime))
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def get(name=None):
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"""
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Return a appropriate JavaScript runtime.
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If name is specified, return the runtime.
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"""
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if name is None:
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return get_from_environment() or _find_available_runtime()
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return _find_runtime_by_name(name)
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def runtimes():
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"""return a dictionary of all supported JavaScript runtimes."""
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return OrderedDict(_runtimes)
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def get_from_environment():
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'''
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Return the JavaScript runtime that is specified in EXECJS_RUNTIME environment variable.
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If EXECJS_RUNTIME environment variable is empty or invalid, return None.
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'''
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name = os.environ.get("EXECJS_RUNTIME", "")
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if not name:
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return None
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try:
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return _find_runtime_by_name(name)
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except exceptions.RuntimeUnavailableError:
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return None
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def _find_available_runtime():
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for _, runtime in _runtimes:
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if runtime.is_available():
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return runtime
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raise exceptions.RuntimeUnavailableError("Could not find an available JavaScript runtime.")
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def _find_runtime_by_name(name):
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for runtime_name, runtime in _runtimes:
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if runtime_name.lower() == name.lower():
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break
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else:
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raise exceptions.RuntimeUnavailableError("{name} runtime is not defined".format(name=name))
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if not runtime.is_available():
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raise exceptions.RuntimeUnavailableError(
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"{name} runtime is not available on this system".format(name=runtime.name))
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return runtime
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_runtimes = []
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register(runtime_names.PyV8, pyv8runtime.PyV8Runtime())
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register(runtime_names.Node, external_runtime.node())
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register(runtime_names.JavaScriptCore, external_runtime.jsc())
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register(runtime_names.SpiderMonkey, external_runtime.spidermonkey())
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register(runtime_names.JScript, external_runtime.jscript())
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register(runtime_names.PhantomJS, external_runtime.phantomjs())
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register(runtime_names.SlimerJS, external_runtime.slimerjs())
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register(runtime_names.Nashorn, external_runtime.nashorn())
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