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https://github.com/go-gitea/gitea
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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.
125 lines
6.9 KiB
Handlebars
125 lines
6.9 KiB
Handlebars
<div class="{{TabSizeClass .Editorconfig .FileName}} non-diff-file-content">
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{{- if .FileError}}
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<div class="ui error message">
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<div class="text left gt-whitespace-pre">{{.FileError}}</div>
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</div>
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{{end}}
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{{- if .FileWarning}}
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<div class="ui warning message">
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<div class="text left gt-whitespace-pre">{{.FileWarning}}</div>
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</div>
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{{end}}
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<h4 class="file-header ui top attached header gt-df gt-ac gt-sb gt-fw">
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<div class="file-header-left gt-df gt-ac gt-py-3 gt-pr-4">
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{{if .ReadmeInList}}
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{{svg "octicon-book" 16 "gt-mr-3"}}
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<strong>{{.FileName}}</strong>
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{{else}}
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{{template "repo/file_info" .}}
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{{end}}
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</div>
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<div class="file-header-right file-actions gt-df gt-ac gt-fw">
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{{if .HasSourceRenderedToggle}}
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<div class="ui compact icon buttons two-toggle-buttons">
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<a href="{{$.Link}}?display=source" class="ui mini basic button {{if .IsDisplayingSource}}active{{end}}" data-tooltip-content="{{.locale.Tr "repo.file_view_source"}}">{{svg "octicon-code" 15}}</a>
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<a href="{{$.Link}}" class="ui mini basic button {{if .IsDisplayingRendered}}active{{end}}" data-tooltip-content="{{.locale.Tr "repo.file_view_rendered"}}">{{svg "octicon-file" 15}}</a>
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</div>
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{{end}}
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{{if not .ReadmeInList}}
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<div class="ui buttons gt-mr-2">
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<a class="ui mini basic button" href="{{$.RawFileLink}}">{{.locale.Tr "repo.file_raw"}}</a>
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{{if not .IsViewCommit}}
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<a class="ui mini basic button" href="{{.RepoLink}}/src/commit/{{PathEscape .CommitID}}/{{PathEscapeSegments .TreePath}}">{{.locale.Tr "repo.file_permalink"}}</a>
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{{end}}
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{{if .IsRepresentableAsText}}
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<a class="ui mini basic button" href="{{.RepoLink}}/blame/{{.BranchNameSubURL}}/{{PathEscapeSegments .TreePath}}">{{.locale.Tr "repo.blame"}}</a>
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{{end}}
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<a class="ui mini basic button" href="{{.RepoLink}}/commits/{{.BranchNameSubURL}}/{{PathEscapeSegments .TreePath}}">{{.locale.Tr "repo.file_history"}}</a>
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{{if .EscapeStatus.Escaped}}
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<a class="ui mini basic button unescape-button gt-hidden">{{.locale.Tr "repo.unescape_control_characters"}}</a>
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<a class="ui mini basic button escape-button">{{.locale.Tr "repo.escape_control_characters"}}</a>
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{{end}}
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</div>
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<a download href="{{$.RawFileLink}}"><span class="btn-octicon" data-tooltip-content="{{.locale.Tr "repo.download_file"}}">{{svg "octicon-download"}}</span></a>
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<a id="copy-content" class="btn-octicon {{if not .CanCopyContent}} disabled{{end}}"{{if or .IsImageFile (and .HasSourceRenderedToggle (not .IsDisplayingSource))}} data-link="{{$.RawFileLink}}"{{end}} data-tooltip-content="{{if .CanCopyContent}}{{.locale.Tr "copy_content"}}{{else}}{{.locale.Tr "copy_type_unsupported"}}{{end}}">{{svg "octicon-copy" 14}}</a>
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{{if .Repository.CanEnableEditor}}
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{{if .CanEditFile}}
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<a href="{{.RepoLink}}/_edit/{{PathEscapeSegments .BranchName}}/{{PathEscapeSegments .TreePath}}"><span class="btn-octicon" data-tooltip-content="{{.EditFileTooltip}}">{{svg "octicon-pencil"}}</span></a>
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{{else}}
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<span class="btn-octicon disabled" data-tooltip-content="{{.EditFileTooltip}}">{{svg "octicon-pencil"}}</span>
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{{end}}
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{{if .CanDeleteFile}}
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<a href="{{.RepoLink}}/_delete/{{PathEscapeSegments .BranchName}}/{{PathEscapeSegments .TreePath}}"><span class="btn-octicon btn-octicon-danger" data-tooltip-content="{{.DeleteFileTooltip}}">{{svg "octicon-trash"}}</span></a>
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{{else}}
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<span class="btn-octicon disabled" data-tooltip-content="{{.DeleteFileTooltip}}">{{svg "octicon-trash"}}</span>
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{{end}}
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{{end}}
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{{else if .EscapeStatus.Escaped}}
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<a class="ui mini basic button unescape-button gt-mr-2 gt-hidden">{{.locale.Tr "repo.unescape_control_characters"}}</a>
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<a class="ui mini basic button escape-button gt-mr-2">{{.locale.Tr "repo.escape_control_characters"}}</a>
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{{end}}
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</div>
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</h4>
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<div class="ui attached table unstackable segment">
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{{if not (or .IsMarkup .IsRenderedHTML)}}
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{{template "repo/unicode_escape_prompt" dict "EscapeStatus" .EscapeStatus "root" $}}
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{{end}}
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<div class="file-view{{if .IsMarkup}} markup {{.MarkupType}}{{else if .IsPlainText}} plain-text{{else if .IsTextSource}} code-view{{end}}">
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{{if .IsMarkup}}
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{{if .FileContent}}{{.FileContent | Safe}}{{end}}
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{{else if .IsPlainText}}
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<pre>{{if .FileContent}}{{.FileContent | Safe}}{{end}}</pre>
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{{else if not .IsTextSource}}
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<div class="view-raw ui center">
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{{if .IsImageFile}}
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<img src="{{$.RawFileLink}}">
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{{else if .IsVideoFile}}
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<video controls src="{{$.RawFileLink}}">
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<strong>{{.locale.Tr "repo.video_not_supported_in_browser"}}</strong>
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</video>
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{{else if .IsAudioFile}}
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<audio controls src="{{$.RawFileLink}}">
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<strong>{{.locale.Tr "repo.audio_not_supported_in_browser"}}</strong>
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</audio>
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{{else if .IsPDFFile}}
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<iframe width="100%" height="600px" src="{{AssetUrlPrefix}}/vendor/plugins/pdfjs/web/viewer.html?file={{$.RawFileLink}}"></iframe>
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{{else}}
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<a href="{{$.RawFileLink}}" rel="nofollow" class="btn btn-gray btn-radius">{{.locale.Tr "repo.file_view_raw"}}</a>
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{{end}}
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</div>
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{{else if .FileSize}}
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{{if .IsFileTooLarge}}
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<table>
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<tbody>
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<tr>
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<td><strong>{{.locale.Tr "repo.file_too_large"}}</strong></td>
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</tr>
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</tbody>
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</table>
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{{else}}
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<table>
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<tbody>
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{{range $idx, $code := .FileContent}}
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{{$line := Eval $idx "+" 1}}
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<tr>
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<td id="L{{$line}}" class="lines-num"><span id="L{{$line}}" data-line-number="{{$line}}"></span></td>
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{{if $.EscapeStatus.Escaped}}
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<td class="lines-escape">{{if (index $.LineEscapeStatus $idx).Escaped}}<a href="" class="toggle-escape-button" title="{{if (index $.LineEscapeStatus $idx).HasInvisible}}{{$.locale.Tr "repo.invisible_runes_line"}} {{end}}{{if (index $.LineEscapeStatus $idx).HasAmbiguous}}{{$.locale.Tr "repo.ambiguous_runes_line"}}{{end}}"></a>{{end}}</td>
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{{end}}
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<td rel="L{{$line}}" class="lines-code chroma"><code class="code-inner">{{$code | Safe}}</code></td>
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</tr>
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{{end}}
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</tbody>
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</table>
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<div class="code-line-menu ui vertical pointing menu tippy-target">
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{{if $.Permission.CanRead $.UnitTypeIssues}}
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<a class="item ref-in-new-issue" data-url-issue-new="{{.RepoLink}}/issues/new" data-url-param-body-link="{{.Repository.Link}}/src/commit/{{PathEscape .CommitID}}/{{PathEscapeSegments .TreePath}}" rel="nofollow noindex">{{.locale.Tr "repo.issues.context.reference_issue"}}</a>
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{{end}}
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<a class="item view_git_blame" href="{{.Repository.Link}}/blame/commit/{{PathEscape .CommitID}}/{{PathEscapeSegments .TreePath}}">{{.locale.Tr "repo.view_git_blame"}}</a>
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<a class="item copy-line-permalink" data-url="{{.Repository.Link}}/src/commit/{{PathEscape .CommitID}}/{{PathEscapeSegments .TreePath}}">{{.locale.Tr "repo.file_copy_permalink"}}</a>
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</div>
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{{end}}
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{{end}}
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</div>
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</div>
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</div>
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