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3b8fa5a753
Now a variable may have an optional slice (only _one_ slice), which can also use negative indices to index from the end. This works on both lists and strings. The contents of the slice have the same semantics as brace expansions. For example: ```sh $ x=(1 2 3 4 5 6) $ echo $x[1..3] # select indices 1, 2, 3 2 3 4 $ echo $x[3,4,1,0] # select indices 3, 4, 1, 0 (in that order) 4 5 2 1 $ x="Well Hello Friends!" $ echo $x[5..9] Hello ```
89 lines
2.4 KiB
C++
89 lines
2.4 KiB
C++
/*
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* Copyright (c) 2020, The SerenityOS developers.
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* All rights reserved.
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*
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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 are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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namespace Shell::AST {
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struct Command;
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class Node;
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class Value;
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class SyntaxError;
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class Pipeline;
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struct Rewiring;
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class NodeVisitor;
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class PathRedirectionNode;
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class And;
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class ListConcatenate;
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class Background;
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class BarewordLiteral;
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class BraceExpansion;
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class CastToCommand;
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class CastToList;
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class CloseFdRedirection;
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class CommandLiteral;
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class Comment;
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class ContinuationControl;
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class DynamicEvaluate;
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class DoubleQuotedString;
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class Fd2FdRedirection;
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class FunctionDeclaration;
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class ForLoop;
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class Glob;
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class HistoryEvent;
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class Execute;
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class IfCond;
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class ImmediateExpression;
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class Join;
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class MatchExpr;
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class Or;
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class Pipe;
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class Range;
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class ReadRedirection;
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class ReadWriteRedirection;
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class Sequence;
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class Subshell;
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class Slice;
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class SimpleVariable;
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class SpecialVariable;
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class Juxtaposition;
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class StringLiteral;
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class StringPartCompose;
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class SyntaxError;
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class SyntheticNode;
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class Tilde;
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class VariableDeclarations;
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class WriteAppendRedirection;
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class WriteRedirection;
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}
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namespace Shell {
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class Shell;
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}
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