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52acddf36c
Enhance `string_list_split_in_place()` to accept multiple characters as
delimiters instead of a single character.
Instead of using `strchr(2)` to locate the first occurrence of the given
delimiter character, `string_list_split_in_place_multi()` uses
`strcspn(2)` to move past the initial segment of characters comprised of
any characters in the delimiting set.
When only a single delimiting character is provided, `strpbrk(2)` (which
is implemented with `strcspn(2)`) has equivalent performance to
`strchr(2)`. Modern `strcspn(2)` implementations treat an empty
delimiter or the singleton delimiter as a special case and fall back to
calling strchrnul(). Both glibc[1] and musl[2] implement `strcspn(2)`
this way.
This change is one step to removing `strtok(2)` from the tree. Note that
`string_list_split_in_place()` is not a strict replacement for
`strtok()`, since it will happily turn sequential delimiter characters
into empty entries in the resulting string_list. For example:
string_list_split_in_place(&xs, "foo:;:bar:;:baz", ":;", -1)
would yield a string list of:
["foo", "", "", "bar", "", "", "baz"]
Callers that wish to emulate the behavior of strtok(2) more directly
should call `string_list_remove_empty_items()` after splitting.
To avoid regressions for the new multi-character delimter cases, update
t0063 in this patch as well.
[1]: https://sourceware.org/git/?p=glibc.git;a=blob;f=string/strcspn.c;hb=glibc-2.37#l35
[2]: https://git.musl-libc.org/cgit/musl/tree/src/string/strcspn.c?h=v1.2.3#n11
Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
143 lines
3.1 KiB
Bash
Executable file
143 lines
3.1 KiB
Bash
Executable file
#!/bin/sh
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#
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# Copyright (c) 2012 Michael Haggerty
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#
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test_description='Test string list functionality'
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TEST_PASSES_SANITIZE_LEAK=true
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. ./test-lib.sh
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test_split () {
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cat >expected &&
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test_expect_success "split $1 at $2, max $3" "
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test-tool string-list split '$1' '$2' '$3' >actual &&
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test_cmp expected actual &&
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test-tool string-list split_in_place '$1' '$2' '$3' >actual &&
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test_cmp expected actual
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"
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}
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test_split_in_place() {
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cat >expected &&
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test_expect_success "split (in place) $1 at $2, max $3" "
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test-tool string-list split_in_place '$1' '$2' '$3' >actual &&
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test_cmp expected actual
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"
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}
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test_split "foo:bar:baz" ":" "-1" <<EOF
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3
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[0]: "foo"
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[1]: "bar"
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[2]: "baz"
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EOF
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test_split "foo:bar:baz" ":" "0" <<EOF
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1
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[0]: "foo:bar:baz"
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EOF
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test_split "foo:bar:baz" ":" "1" <<EOF
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2
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[0]: "foo"
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[1]: "bar:baz"
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EOF
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test_split "foo:bar:baz" ":" "2" <<EOF
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3
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[0]: "foo"
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[1]: "bar"
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[2]: "baz"
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EOF
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test_split "foo:bar:" ":" "-1" <<EOF
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3
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[0]: "foo"
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[1]: "bar"
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[2]: ""
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EOF
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test_split "" ":" "-1" <<EOF
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1
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[0]: ""
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EOF
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test_split ":" ":" "-1" <<EOF
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2
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[0]: ""
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[1]: ""
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EOF
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test_split_in_place "foo:;:bar:;:baz:;:" ":;" "-1" <<EOF
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10
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[0]: "foo"
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[1]: ""
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[2]: ""
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[3]: "bar"
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[4]: ""
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[5]: ""
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[6]: "baz"
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[7]: ""
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[8]: ""
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[9]: ""
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EOF
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test_split_in_place "foo:;:bar:;:baz" ":;" "0" <<EOF
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1
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[0]: "foo:;:bar:;:baz"
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EOF
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test_split_in_place "foo:;:bar:;:baz" ":;" "1" <<EOF
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2
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[0]: "foo"
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[1]: ";:bar:;:baz"
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EOF
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test_split_in_place "foo:;:bar:;:baz" ":;" "2" <<EOF
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3
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[0]: "foo"
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[1]: ""
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[2]: ":bar:;:baz"
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EOF
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test_split_in_place "foo:;:bar:;:" ":;" "-1" <<EOF
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7
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[0]: "foo"
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[1]: ""
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[2]: ""
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[3]: "bar"
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[4]: ""
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[5]: ""
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[6]: ""
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EOF
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test_expect_success "test filter_string_list" '
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test "x-" = "x$(test-tool string-list filter - y)" &&
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test "x-" = "x$(test-tool string-list filter no y)" &&
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test yes = "$(test-tool string-list filter yes y)" &&
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test yes = "$(test-tool string-list filter no:yes y)" &&
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test yes = "$(test-tool string-list filter yes:no y)" &&
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test y1:y2 = "$(test-tool string-list filter y1:y2 y)" &&
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test y2:y1 = "$(test-tool string-list filter y2:y1 y)" &&
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test "x-" = "x$(test-tool string-list filter x1:x2 y)"
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'
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test_expect_success "test remove_duplicates" '
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test "x-" = "x$(test-tool string-list remove_duplicates -)" &&
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test "x" = "x$(test-tool string-list remove_duplicates "")" &&
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test a = "$(test-tool string-list remove_duplicates a)" &&
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test a = "$(test-tool string-list remove_duplicates a:a)" &&
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test a = "$(test-tool string-list remove_duplicates a:a:a:a:a)" &&
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test a:b = "$(test-tool string-list remove_duplicates a:b)" &&
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test a:b = "$(test-tool string-list remove_duplicates a:a:b)" &&
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test a:b = "$(test-tool string-list remove_duplicates a:b:b)" &&
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test a:b:c = "$(test-tool string-list remove_duplicates a:b:c)" &&
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test a:b:c = "$(test-tool string-list remove_duplicates a:a:b:c)" &&
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test a:b:c = "$(test-tool string-list remove_duplicates a:b:b:c)" &&
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test a:b:c = "$(test-tool string-list remove_duplicates a:b:c:c)" &&
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test a:b:c = "$(test-tool string-list remove_duplicates a:a:b:b:c:c)" &&
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test a:b:c = "$(test-tool string-list remove_duplicates a:a:a:b:b:b:c:c:c)"
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'
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test_done
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