mirror of https://github.com/jkjoy/sunpeiwen.git
64 lines
2.7 KiB
JavaScript
64 lines
2.7 KiB
JavaScript
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/***********************************************************************
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A JavaScript tokenizer / parser / beautifier / compressor.
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https://github.com/mishoo/UglifyJS2
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-------------------------------- (C) ---------------------------------
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Author: Mihai Bazon
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<mihai.bazon@gmail.com>
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http://mihai.bazon.net/blog
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Distributed under the BSD license:
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Copyright 2012 (c) Mihai Bazon <mihai.bazon@gmail.com>
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above
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copyright notice, this list of conditions and the following
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disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the following
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disclaimer in the documentation and/or other materials
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provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
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TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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SUCH DAMAGE.
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***********************************************************************/
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// bitfield flags to be stored in node.flags.
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// These are set and unset during compression, and store information in the node without requiring multiple fields.
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export const UNUSED = 0b00000001;
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export const TRUTHY = 0b00000010;
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export const FALSY = 0b00000100;
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export const UNDEFINED = 0b00001000;
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export const INLINED = 0b00010000;
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// Nodes to which values are ever written. Used when keep_assign is part of the unused option string.
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export const WRITE_ONLY = 0b00100000;
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// information specific to a single compression pass
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export const SQUEEZED = 0b0000000100000000;
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export const OPTIMIZED = 0b0000001000000000;
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export const TOP = 0b0000010000000000;
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export const CLEAR_BETWEEN_PASSES = SQUEEZED | OPTIMIZED | TOP;
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export const has_flag = (node, flag) => node.flags & flag;
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export const set_flag = (node, flag) => { node.flags |= flag; };
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export const clear_flag = (node, flag) => { node.flags &= ~flag; };
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