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/* Copyright (C) 2003-2015 LiveCode Ltd.
This file is part of LiveCode.
LiveCode is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License v3 as published by the Free
Software Foundation.
LiveCode is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with LiveCode. If not see <http://www.gnu.org/licenses/>. */
/**
This library consists of the sorting operations provided by the standard library of LiveCode Builder.
*/
module com.livecode.sort
public foreign handler MCSortExecSortListAscending(inout Target as List) returns nothing binds to "<builtin>"
public foreign handler MCSortExecSortListDescending(inout Target as List) returns nothing binds to "<builtin>"
public foreign handler MCSortExecSortListAscendingText(inout Target as List) returns nothing binds to "<builtin>"
public foreign handler MCSortExecSortListAscendingBinary(inout Target as List) returns nothing binds to "<builtin>"
public foreign handler MCSortExecSortListAscendingNumeric(inout Target as List) returns nothing binds to "<builtin>"
public foreign handler MCSortExecSortListAscendingDateTime(inout Target as List) returns nothing binds to "<builtin>"
public foreign handler MCSortExecSortListDescendingText(inout Target as List) returns nothing binds to "<builtin>"
public foreign handler MCSortExecSortListDescendingBinary(inout Target as List) returns nothing binds to "<builtin>"
public foreign handler MCSortExecSortListDescendingNumeric(inout Target as List) returns nothing binds to "<builtin>"
public foreign handler MCSortExecSortListDescendingDateTime(inout Target as List) returns nothing binds to "<builtin>"
--
/**
Summary: Sorts <Target> in ascending order.
Target: An expression that evaluates to a list.
Example:
variable tTestList as List
put [4,3,1,5,2] into tTestList
sort tTestList -- tTestList is [1,2,3,4,5]
Description:
Generic sort is performed by comparing the elements of a homogeneous list according to the default comparison function associated to the type of its elements.
>*Note:* It is an error if <Target> is not homogeneous, i.e. if it contains any elements of differing type.
Tags: Sorting
*/
syntax SortListAscending is statement
"sort" <Target: Expression> ["in" "ascending" "order"]
begin
MCSortExecSortListAscending(Target)
end syntax
/**
Summary: Sorts <Target> in descending text order.
Target: An expression that evaluates to a list of strings.
Example:
variable tTestList as List
put ["a", "b", "c"] into tTestList
sort tTestList in descending order -- tTestList is ["c", "b", "a"]
Description:
Generic sort is performed by comparing the elements of a homogeneous list according to the default comparison function associated to the type of its elements.
>*Note:* It is an error if <Target> is not homogeneous, i.e. if it contains any elements of differing type.
Tags: Sorting
*/
syntax SortListDescending is statement
"sort" <Target: Expression> "in" "descending" "order"
begin
MCSortExecSortListDescending(Target)
end syntax
--
/**
Summary: Sorts <Target> in ascending text order.
Target: An expression that evaluates to a list of strings.
Example:
variable tTestList as List
variable tChar
repeat for each char tChar in "spoilage"
push tChar onto tTestList
end repeat
sort tTestList in ascending text order
variable tString as String
combine tTestList with "" into tString -- tString is "aegilops"
Description:
Text sort is performed by comparing string elements on a codepoint by codepoint basis.
>*Note:* It is an error if <Target> contains any elements of non-string type.
Tags: Sorting
*/
syntax SortListAscendingText is statement
"sort" <Target: Expression> "in" "ascending" "text" "order"
begin
MCSortExecSortListAscendingText(Target)
end syntax
/**
Summary: Sorts <Target> in descending text order.
Target: An expression that evaluates to a list of strings.
Example:
variable tTestList as List
put the empty list into tTestList
push "abcd" onto tTestList
push "xyz" onto tTestList
sort tTestList in descending text order -- tTestList is ["xyz", "abcd"]
Description:
Text sort is performed by comparing string elements on a codepoint by codepoint basis.
>*Note:* It is an error if <Target> contains any elements of non-string type.
Tags: Sorting
*/
syntax SortListDescendingText is statement
"sort" <Target: Expression> "in" "descending" "text" "order"
begin
MCSortExecSortListDescendingText(Target)
end syntax
--
/**
Summary: Sorts <Target> in ascending binary order.
Target: An expression that evaluates to a list of binary data.
Description:
Binary sort is performed by comparing data elements on a byte by byte basis.
>*Note:* It is an error if <Target> contains any elements of non-data type.
Tags: Sorting
*/
syntax SortListAscendingBinary is statement
"sort" <Target: Expression> "in" "ascending" "byte" "order"
begin
MCSortExecSortListAscendingBinary(Target)
end syntax
/**
Summary: Sorts <Target> in descending binary order.
Target: An expression that evaluates to a list of binary data.
Description:
Binary sort is performed by comparing data elements on a byte by byte basis.
>*Note:* It is an error if <Target> contains any elements of non-data type.
Tags: Sorting
*/
syntax SortListDescendingBinary is statement
"sort" <Target: Expression> "in" "descending" "byte" "order"
begin
MCSortExecSortListDescendingBinary(Target)
end syntax
--
/**
Summary: Sorts <Target> in ascending numeric order.
Target: An expression that evaluates to a list of numbers.
Example:
variable tTestList as List
put [3,4,5,1,2] into tTestList
sort tTestList in ascending numeric order -- tTestList is [1,2,3,4,5]
Description:
Numeric sort is performed by comparing numeric elements by cardinality.
>*Note:* It is an error if <Target> contains any elements of non-numeric type.
Tags: Sorting
*/
syntax SortListAscendingNumeric is statement
"sort" <Target: Expression> "in" "ascending" "numeric" "order"
begin
MCSortExecSortListAscendingNumeric(Target)
end syntax
/**
Summary: Sorts <Target> in descending numeric order.
Target: An expression that evaluates to a list of numbers.
Example:
variable tTestList as List
put [3,4,5,1,2] into tTestList
sort tTestList in descending numeric order -- tTestList is [5,4,3,2,1]
Description:
Numeric sort is performed by comparing numeric elements by cardinality.
>*Note:* It is an error if <Target> contains any elements of non-numeric type.
Tags: Sorting
*/
syntax SortListDescendingNumeric is statement
"sort" <Target: Expression> "in" "descending" "numeric" "order"
begin
MCSortExecSortListDescendingNumeric(Target)
end syntax
--
syntax SortListAscendingDateTime is statement
"sort" <Target: Expression> "in" "ascending" "chronological" "order"
begin
MCSortExecSortListAscendingDateTime(Target)
end syntax
syntax SortListDescendingDateTime is statement
"sort" <Target: Expression> "in" "descending" "chronological" "order"
begin
MCSortExecSortListDescendingDateTime(Target)
end syntax
--
/**
Summary: A handler type that can be used in the <SortListUsingHandler> command.
Parameters:
pLeft: The left hand value to compare.
pRight: The right hand value to compare.
Returns:
An integer less than 0 if pLeft is less than pRight with respect to the intended ordering,
an integer greater than 0 if pLeft is greater than pRight with respect to the intended ordering,
or 0 if pLeft is equal to pRight.
Description:
Any handler of type <SortCompare> can be passed to <SortListUsingHandler> to sort a list.
It takes two arguments, and returns an integer based on the comparison.
Tags: Sorting
*/
public handler type SortCompare(in pLeft as any, in pRight as any) returns Integer
public foreign handler MCSortExecSortListUsingHandler(inout Target as List, in Handler as SortCompare) returns nothing binds to "<builtin>"
/**
Summary: Sorts <Target> using <Handler> as a comparison function.
Target: An expression that evaluates to a list.
Handler: A handler of type <SortCompare>
Example:
variable sKeyIndex as Number
private handler CompareListsByElement(in pLeft as any, in pRight as any) returns Integer
variable tLeft as Number
variable tRight as Number
put pLeft[sKeyIndex] into tLeft
put pRight[sKeyIndex] into tRight
if tLeft > tRight then
return 1
else if tLeft < tRight then
return -1
else
return 0
end if
end handler
-- Sort lists according to value at specified index of each list
public handler TestSortListOfLists(in pList as List, in pKeyIndex as Number) returns List
put pKeyIndex into sKeyIndex
sort pList using handler CompareListsByElement
return pList
end handler
Description:
<SortListUsingHandler> sorts a list by comparing the elements of a list according to the
comparison implemented by the <Handler> argument.
>*Note:* Supplying an inconsistent comparison operator to <SortListUsingHandler> causes
undefined behavior.
Tags: Sorting
*/
syntax SortListUsingHandler is statement
"sort" <Target: Expression> "using" "handler" <Handler: Expression>
begin
MCSortExecSortListUsingHandler(Target, Handler)
end syntax
end module