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	Just use a slice when rendering file (#16774)
Highlight currently uses a map which is memory inefficient. Switch to use a slice instead. Signed-off-by: Andrew Thornton <art27@cantab.net>
This commit is contained in:
		@@ -19,7 +19,7 @@ func TestFile(t *testing.T) {
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		numLines int
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		fileName string
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		code     string
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		want     map[int]string
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		want     []string
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	}{
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		{
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			name:     ".drone.yml",
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@@ -38,22 +38,22 @@ steps:
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	- go build -v
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	- go test -v -race -coverprofile=coverage.txt -covermode=atomic
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`,
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			want: map[int]string{
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				1: `<span class="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l">pipeline</span>`,
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				2: `<span class="w"></span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l">default</span>`,
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				3: `<span class="w">
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			want: []string{
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				`<span class="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l">pipeline</span>`,
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				`<span class="w"></span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l">default</span>`,
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				`<span class="w">
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</span>`,
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				4: `<span class="w"></span><span class="nt">steps</span><span class="p">:</span>`,
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				5: `<span class="w"></span>- <span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l">test</span>`,
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				6: `<span class="w">	</span><span class="nt">image</span><span class="p">:</span><span class="w"> </span><span class="l">golang:1.13</span>`,
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				7: `<span class="w">	</span><span class="nt">environment</span><span class="p">:</span>`,
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				8: `<span class="w"></span><span class="w">		</span><span class="nt">GOPROXY</span><span class="p">:</span><span class="w"> </span><span class="l">https://goproxy.cn</span>`,
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				9: `<span class="w">	</span><span class="nt">commands</span><span class="p">:</span>`,
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				10: `<span class="w"></span><span class="w">	</span>- <span class="l">go get -u</span>`,
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				11: `<span class="w">	</span>- <span class="l">go build -v</span>`,
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				12: `<span class="w">	</span>- <span class="l">go test -v -race -coverprofile=coverage.txt -covermode=atomic</span><span class="w">
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				`<span class="w"></span><span class="nt">steps</span><span class="p">:</span>`,
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				`<span class="w"></span>- <span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l">test</span>`,
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				`<span class="w">	</span><span class="nt">image</span><span class="p">:</span><span class="w"> </span><span class="l">golang:1.13</span>`,
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				`<span class="w">	</span><span class="nt">environment</span><span class="p">:</span>`,
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				`<span class="w"></span><span class="w">		</span><span class="nt">GOPROXY</span><span class="p">:</span><span class="w"> </span><span class="l">https://goproxy.cn</span>`,
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				`<span class="w">	</span><span class="nt">commands</span><span class="p">:</span>`,
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				`<span class="w"></span><span class="w">	</span>- <span class="l">go get -u</span>`,
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				`<span class="w">	</span>- <span class="l">go build -v</span>`,
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				`<span class="w">	</span>- <span class="l">go test -v -race -coverprofile=coverage.txt -covermode=atomic</span><span class="w">
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</span>`,
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				13: `<span class="w">
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				`<span class="w">
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</span>`,
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			},
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		},
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@@ -74,21 +74,21 @@ steps:
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	- go build -v
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	- go test -v -race -coverprofile=coverage.txt -covermode=atomic
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	`,
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			want: map[int]string{
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				1: `<span class="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l">pipeline</span>`,
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				2: `<span class="w"></span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l">default  </span>`,
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				3: `<span class="w">
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			want: []string{
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				`<span class="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l">pipeline</span>`,
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				`<span class="w"></span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l">default  </span>`,
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				`<span class="w">
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</span>`,
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				4: `<span class="w"></span><span class="nt">steps</span><span class="p">:</span>`,
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				5: `<span class="w"></span>- <span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l">test</span>`,
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				6: `<span class="w">	</span><span class="nt">image</span><span class="p">:</span><span class="w"> </span><span class="l">golang:1.13</span>`,
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				7: `<span class="w">	</span><span class="nt">environment</span><span class="p">:</span>`,
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				8: `<span class="w"></span><span class="w">		</span><span class="nt">GOPROXY</span><span class="p">:</span><span class="w"> </span><span class="l">https://goproxy.cn</span>`,
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				9: `<span class="w">	</span><span class="nt">commands</span><span class="p">:</span>`,
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				10: `<span class="w"></span><span class="w">	</span>- <span class="l">go get -u</span>`,
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				11: `<span class="w">	</span>- <span class="l">go build -v</span>`,
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				12: `<span class="w">	</span>- <span class="l">go test -v -race -coverprofile=coverage.txt -covermode=atomic</span>`,
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				13: `<span class="w">	</span>`,
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				`<span class="w"></span><span class="nt">steps</span><span class="p">:</span>`,
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				`<span class="w"></span>- <span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l">test</span>`,
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				`<span class="w">	</span><span class="nt">image</span><span class="p">:</span><span class="w"> </span><span class="l">golang:1.13</span>`,
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				`<span class="w">	</span><span class="nt">environment</span><span class="p">:</span>`,
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				`<span class="w"></span><span class="w">		</span><span class="nt">GOPROXY</span><span class="p">:</span><span class="w"> </span><span class="l">https://goproxy.cn</span>`,
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				`<span class="w">	</span><span class="nt">commands</span><span class="p">:</span>`,
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				`<span class="w"></span><span class="w">	</span>- <span class="l">go get -u</span>`,
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				`<span class="w">	</span>- <span class="l">go build -v</span>`,
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				`<span class="w">	</span>- <span class="l">go test -v -race -coverprofile=coverage.txt -covermode=atomic</span>`,
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				`<span class="w">	</span>`,
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			},
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		},
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	}
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