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matchParamOp.go
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matchParamOp.go
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// shellexpand is a replacement for Golang's `os.Expand()` that supports
// UNIX shell string expansion and substituation
//
// Copyright 2019-present Ganbaro Digital Ltd
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in
// the documentation and/or other materials provided with the
// distribution.
//
// * Neither the names of the copyright holders nor the names of his
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
package shellexpand
const (
paramOpInvalid = iota
paramOpUseDefaultValue
paramOpAssignDefaultValue
paramOpWriteError
paramOpUseAlternativeValue
paramOpSubstring
paramOpRemoveShortestPrefix
paramOpRemoveLongestPrefix
paramOpRemoveShortestSuffix
paramOpRemoveLongestSuffix
paramOpSearchReplace
paramOpUppercaseFirstChar
paramOpUppercaseAllMatches
paramOpLowercaseFirstChar
paramOpLowercaseAllMatches
paramOpDescribeFlags
paramOpDeclare
paramOpEscape
paramOpExpandAsPrompt
paramOpExpandDoubleQuotes
// this has been added to help us test unsupported operand rejection
// in the parameter parser
paramOpEmptyObject
)
func matchParamOp(input string, start int) (int, int, bool) {
// shorthand
inputLen := len(input)
maxInput := inputLen - 1
startPlus1 := start + 1
// what are we looking at?
switch input[start] {
case ':':
if start == maxInput {
return paramOpInvalid, 0, false
}
switch input[startPlus1] {
case '-':
return paramOpUseDefaultValue, startPlus1, true
case '=':
return paramOpAssignDefaultValue, startPlus1, true
case '?':
return paramOpWriteError, startPlus1, true
case '+':
return paramOpUseAlternativeValue, startPlus1, true
default:
return paramOpSubstring, start, true
}
case '#':
if start < maxInput && input[startPlus1] == '#' {
return paramOpRemoveLongestPrefix, startPlus1, true
}
return paramOpRemoveShortestPrefix, start, true
case '%':
if start < maxInput && input[startPlus1] == '%' {
return paramOpRemoveLongestSuffix, startPlus1, true
}
return paramOpRemoveShortestSuffix, start, true
case '/':
return paramOpSearchReplace, start, true
case '^':
if start < maxInput && input[startPlus1] == '^' {
return paramOpUppercaseAllMatches, startPlus1, true
}
return paramOpUppercaseFirstChar, start, true
case ',':
if start < maxInput && input[startPlus1] == ',' {
return paramOpLowercaseAllMatches, startPlus1, true
}
return paramOpLowercaseFirstChar, start, true
case '@':
if start == maxInput {
return paramOpInvalid, 0, false
}
switch input[startPlus1] {
case 'a':
return paramOpDescribeFlags, startPlus1, true
case 'A':
return paramOpDeclare, startPlus1, true
case 'E':
return paramOpEscape, startPlus1, true
case 'P':
return paramOpExpandAsPrompt, startPlus1, true
case 'Q':
return paramOpExpandDoubleQuotes, startPlus1, true
default:
return paramOpInvalid, 0, false
}
default:
return paramOpInvalid, 0, false
}
}