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LibJS+js: Support getting last value from "_" variable
The interpreter now has an "underscore is last value" flag, which makes Interpreter::get_variable() return the last value if: - The m_underscore_is_last_value flag is enabled - The name of the variable lookup is "_" - The result of that lookup is an empty value That means "_" can still be used as a regular variable and will stop doing its magic once anything is assigned to it. Example REPL session: > 1 1 > _ + _ 2 > _ + _ 4 > _ = "foo" "foo" > 1 1 > _ "foo" > delete _ true > 1 1 > _ 1 >
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3 changed files with 13 additions and 2 deletions
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@ -575,6 +575,7 @@ int main(int argc, char** argv)
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ReplConsoleClient console_client(interpreter->console());
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interpreter->console().set_client(console_client);
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interpreter->heap().set_should_collect_on_every_allocation(gc_on_every_allocation);
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interpreter->set_underscore_is_last_value(true);
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if (test_mode)
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enable_test_mode(*interpreter);
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