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5b89670a31
One of the proposals in #23328 This PR introduces a simple expression calculator (templates/eval/eval.go), it can do basic expression calculations. Many untested template helper functions like `Mul` `Add` can be replaced by this new approach. Then these `Add` / `Mul` / `percentage` / `Subtract` / `DiffStatsWidth` could all use this `Eval`. And it provides enhancements for Golang templates, and improves readability. Some examples: ---- * Before: `{{Add (Mul $glyph.Row 12) 12}}` * After: `{{Eval $glyph.Row "*" 12 "+" 12}}` ---- * Before: `{{if lt (Add $i 1) (len $.Topics)}}` * After: `{{if Eval $i "+" 1 "<" (len $.Topics)}}` ## FAQ ### Why not use an existing expression package? We need a highly customized expression engine: * do the calculation on the fly, without pre-compiling * deal with int/int64/float64 types, to make the result could be used in Golang template. * make the syntax could be used in the Golang template directly * do not introduce too much complex or strange syntax, we just need a simple calculator. * it needs to strictly follow Golang template's behavior, for example, Golang template treats all non-zero values as truth, but many 3rd packages don't do so. ### What's the benefit? * Developers don't need to add more `Add`/`Mul`/`Sub`-like functions, they were getting more and more. Now, only one `Eval` is enough for all cases. * The new code reads better than old `{{Add (Mul $glyph.Row 12) 12}}`, the old one isn't familiar to most procedural programming developers (eg, the Golang expression syntax). * The `Eval` is fully covered by tests, many old `Add`/`Mul`-like functions were never tested. ### The performance? It doesn't use `reflect`, it doesn't need to parse or compile when used in Golang template, the performance is as fast as native Go template. ### Is it too complex? Could it be unstable? The expression calculator program is a common homework for computer science students, and it's widely used as a teaching and practicing purpose for developers. The algorithm is pretty well-known. The behavior can be clearly defined, it is stable.
53 lines
2.2 KiB
Handlebars
53 lines
2.2 KiB
Handlebars
{{$index := 0}}
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<div class="timeline-item commits-list">
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{{range .comment.Commits}}
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{{$tag := printf "%s-%d" $.comment.HashTag $index}}
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{{$index = Eval $index "+" 1}}
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<div class="singular-commit" id="{{$tag}}">
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<span class="badge badge-commit">{{svg "octicon-git-commit"}}</span>
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{{if .User}}
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<a href="{{.User.HomeLink}}">
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{{avatar $.root.Context .User}}
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</a>
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{{else}}
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{{avatarByEmail $.root.Context .Author.Email .Author.Name}}
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{{end}}
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{{$commitLink:= printf "%s/commit/%s" $.comment.Issue.PullRequest.BaseRepo.Link (PathEscape .ID.String)}}
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<span class="ui float right shabox">
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{{template "repo/commit_statuses" dict "Status" .Status "Statuses" .Statuses "root" $.root}}
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{{$class := "ui sha label"}}
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{{if .Signature}}
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{{$class = (printf "%s%s" $class " isSigned")}}
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{{if .Verification.Verified}}
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{{if eq .Verification.TrustStatus "trusted"}}
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{{$class = (printf "%s%s" $class " isVerified")}}
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{{else if eq .Verification.TrustStatus "untrusted"}}
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{{$class = (printf "%s%s" $class " isVerifiedUntrusted")}}
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{{else}}
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{{$class = (printf "%s%s" $class " isVerifiedUnmatched")}}
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{{end}}
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{{else if .Verification.Warning}}
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{{$class = (printf "%s%s" $class " isWarning")}}
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{{end}}
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{{end}}
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<a href="{{$commitLink}}" rel="nofollow" class="{{$class}}">
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<span class="shortsha">{{ShortSha .ID.String}}</span>
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{{if .Signature}}
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{{template "repo/shabox_badge" dict "root" $.root "verification" .Verification}}
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{{end}}
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</a>
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</span>
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<span class="gt-mono commit-summary {{if gt .ParentCount 1}} grey text{{end}}" title="{{.Summary}}">{{RenderCommitMessageLinkSubject $.root.Context .Message ($.comment.Issue.PullRequest.BaseRepo.Link|Escape) $commitLink $.comment.Issue.PullRequest.BaseRepo.ComposeMetas}}</span>
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{{if IsMultilineCommitMessage .Message}}
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<button class="ui button ellipsis-button" aria-expanded="false">...</button>
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{{end}}
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{{if IsMultilineCommitMessage .Message}}
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<pre class="commit-body gt-hidden">{{RenderCommitBody $.root.Context .Message ($.comment.Issue.PullRequest.BaseRepo.Link|Escape) $.comment.Issue.PullRequest.BaseRepo.ComposeMetas}}</pre>
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{{end}}
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</div>
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{{end}}
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</div>
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