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115 lines
2.6 KiB
C++
115 lines
2.6 KiB
C++
//------------------------------------------------------------------------------
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/*
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https://github.com/vinniefalco/LuaBridge
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Copyright 2012, Vinnie Falco <vinnie.falco@gmail.com>
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License: The MIT License (http://www.opensource.org/licenses/mit-license.php)
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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//==============================================================================
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/** Allows table iteration.
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*/
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class Iterator
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{
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private:
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lua_State* m_L;
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LuaRef m_table;
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LuaRef m_key;
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LuaRef m_value;
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void next ()
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{
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m_table.push(m_L);
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m_key.push (m_L);
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if (lua_next (m_L, -2))
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{
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m_value.pop (m_L);
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m_key.pop (m_L);
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}
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else
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{
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m_key = Nil();
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m_value = Nil();
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}
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lua_pop(m_L, 1);
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}
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public:
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explicit Iterator (LuaRef table)
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: m_L (table.state ())
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, m_table (table)
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, m_key (table.state ()) // m_key is nil
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, m_value (table.state ()) // m_value is nil
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{
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next (); // get the first (key, value) pair from table
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}
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lua_State* state () const
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{
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return m_L;
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}
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LuaRef operator* () const
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{
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return m_value;
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}
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LuaRef operator-> () const
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{
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return m_value;
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}
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Iterator& operator++ ()
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{
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if (isNil())
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{
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// if the iterator reaches the end, do nothing
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return *this;
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}
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else
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{
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next();
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return *this;
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}
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}
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inline bool isNil () const
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{
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return m_key.isNil ();
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}
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inline LuaRef key () const
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{
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return m_key;
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}
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inline LuaRef value () const
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{
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return m_value;
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}
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private:
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// Don't use postfix increment, it is less efficient
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Iterator operator++ (int);
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};
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