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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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@ -177,6 +177,9 @@ public:
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Value last_value() const { return m_last_value; }
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bool underscore_is_last_value() const { return m_underscore_is_last_value; }
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void set_underscore_is_last_value(bool b) { m_underscore_is_last_value = b; }
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Console& console() { return m_console; }
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const Console& console() const { return m_console; }
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@ -199,6 +202,8 @@ private:
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ScopeType m_unwind_until { ScopeType::None };
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FlyString m_unwind_until_label;
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bool m_underscore_is_last_value { false };
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Console m_console;
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};
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