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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this file,
# Pretty-printer for SpiderMonkey symbols.
import mozilla.prettyprinters
from mozilla.CellHeader import get_header_ptr
from mozilla.prettyprinters import ptr_pretty_printer
# Forget any printers from previous loads of this module.
mozilla.prettyprinters.clear_module_printers(__name__)
# JS::SymbolCode enumerators
PrivateNameSymbol = 0xFFFFFFFD
InSymbolRegistry = 0xFFFFFFFE
UniqueSymbol = 0xFFFFFFFF
@ptr_pretty_printer("JS::Symbol")
class JSSymbolPtr(mozilla.prettyprinters.Pointer):
def __init__(self, value, cache):
super(JSSymbolPtr, self).__init__(value, cache)
self.value = value
def to_string(self):
code = int(self.value["code_"]) & 0xFFFFFFFF
desc = str(get_header_ptr(self.value, self.cache.JSString_ptr_t))
if code == InSymbolRegistry:
return "Symbol.for({})".format(desc)
elif code == UniqueSymbol:
return "Symbol({})".format(desc)
elif code == PrivateNameSymbol:
return "#{}".format(desc)
else:
# Well-known symbol. Strip off the quotes added by the JSString *
# pretty-printer.
assert desc[0] == '"'
assert desc[-1] == '"'
return desc[1:-1]