From 88c2e2436001c868c2583950b5f9eb0516424b7d Mon Sep 17 00:00:00 2001 From: zeripath Date: Tue, 13 Sep 2022 17:33:37 +0100 Subject: [PATCH] Add KaTeX rendering to Markdown. (#20571) This PR adds mathematical rendering with KaTeX. The first step is to add a Goldmark extension that detects the latex (and tex) mathematics delimiters. The second step to make this extension only run if math support is enabled. The second step is to then add KaTeX CSS and JS to the head which will load after the dom is rendered. Fix #3445 Signed-off-by: Andrew Thornton Signed-off-by: Andrew Thornton Co-authored-by: silverwind Co-authored-by: Lunny Xiao --- custom/conf/app.example.ini | 3 + .../doc/advanced/config-cheat-sheet.en-us.md | 1 + .../doc/advanced/external-renderers.en-us.md | 3 +- docs/content/doc/features/comparison.en-us.md | 2 + docs/content/page/index.en-us.md | 3 +- go.mod | 2 +- modules/markup/markdown/convertyaml.go | 84 +++++++ modules/markup/markdown/goldmark.go | 15 +- modules/markup/markdown/markdown.go | 20 +- modules/markup/markdown/math/block_node.go | 42 ++++ modules/markup/markdown/math/block_parser.go | 123 ++++++++++ .../markup/markdown/math/block_renderer.go | 43 ++++ modules/markup/markdown/math/inline_node.go | 49 ++++ modules/markup/markdown/math/inline_parser.go | 99 ++++++++ .../markup/markdown/math/inline_renderer.go | 47 ++++ modules/markup/markdown/math/math.go | 108 +++++++++ modules/markup/markdown/meta.go | 96 ++++++-- modules/markup/markdown/meta_test.go | 32 +++ modules/markup/markdown/renderconfig.go | 223 +++++++----------- modules/markup/markdown/renderconfig_test.go | 162 +++++++++++++ modules/markup/sanitizer.go | 4 +- modules/setting/setting.go | 2 + package-lock.json | 39 +++ package.json | 1 + web_src/js/markup/content.js | 2 + web_src/js/markup/math.js | 37 +++ web_src/less/animations.less | 7 + webpack.config.js | 4 + 28 files changed, 1079 insertions(+), 174 deletions(-) create mode 100644 modules/markup/markdown/convertyaml.go create mode 100644 modules/markup/markdown/math/block_node.go create mode 100644 modules/markup/markdown/math/block_parser.go create mode 100644 modules/markup/markdown/math/block_renderer.go create mode 100644 modules/markup/markdown/math/inline_node.go create mode 100644 modules/markup/markdown/math/inline_parser.go create mode 100644 modules/markup/markdown/math/inline_renderer.go create mode 100644 modules/markup/markdown/math/math.go create mode 100644 modules/markup/markdown/renderconfig_test.go create mode 100644 web_src/js/markup/math.js diff --git a/custom/conf/app.example.ini b/custom/conf/app.example.ini index 1561a53da..6e1eca7a6 100644 --- a/custom/conf/app.example.ini +++ b/custom/conf/app.example.ini @@ -1262,6 +1262,9 @@ ROUTER = console ;; List of file extensions that should be rendered/edited as Markdown ;; Separate the extensions with a comma. To render files without any extension as markdown, just put a comma ;FILE_EXTENSIONS = .md,.markdown,.mdown,.mkd +;; +;; Enables math inline and block detection +;ENABLE_MATH = true ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; diff --git a/docs/content/doc/advanced/config-cheat-sheet.en-us.md b/docs/content/doc/advanced/config-cheat-sheet.en-us.md index 05cedeb63..459e42ac2 100644 --- a/docs/content/doc/advanced/config-cheat-sheet.en-us.md +++ b/docs/content/doc/advanced/config-cheat-sheet.en-us.md @@ -236,6 +236,7 @@ The following configuration set `Content-Type: application/vnd.android.package-a - `CUSTOM_URL_SCHEMES`: Use a comma separated list (ftp,git,svn) to indicate additional URL hyperlinks to be rendered in Markdown. URLs beginning in http and https are always displayed +- `ENABLE_MATH`: **true**: Enables detection of `\(...\)`, `\[...\]`, `$...$` and `$$...$$` blocks as math blocks. ## Server (`server`) diff --git a/docs/content/doc/advanced/external-renderers.en-us.md b/docs/content/doc/advanced/external-renderers.en-us.md index 4e5e72554..f40c23dd8 100644 --- a/docs/content/doc/advanced/external-renderers.en-us.md +++ b/docs/content/doc/advanced/external-renderers.en-us.md @@ -74,12 +74,13 @@ RENDER_COMMAND = "timeout 30s pandoc +RTS -M512M -RTS -f rst" IS_INPUT_FILE = false ``` -If your external markup relies on additional classes and attributes on the generated HTML elements, you might need to enable custom sanitizer policies. Gitea uses the [`bluemonday`](https://godoc.org/github.com/microcosm-cc/bluemonday) package as our HTML sanitizier. The example below will support [KaTeX](https://katex.org/) output from [`pandoc`](https://pandoc.org/). +If your external markup relies on additional classes and attributes on the generated HTML elements, you might need to enable custom sanitizer policies. Gitea uses the [`bluemonday`](https://godoc.org/github.com/microcosm-cc/bluemonday) package as our HTML sanitizer. The example below could be used to support server-side [KaTeX](https://katex.org/) rendering output from [`pandoc`](https://pandoc.org/). ```ini [markup.sanitizer.TeX] ; Pandoc renders TeX segments as s with the "math" class, optionally ; with "inline" or "display" classes depending on context. +; - note this is different from the built-in math support in our markdown parser which uses ELEMENT = span ALLOW_ATTR = class REGEXP = ^\s*((math(\s+|$)|inline(\s+|$)|display(\s+|$)))+ diff --git a/docs/content/doc/features/comparison.en-us.md b/docs/content/doc/features/comparison.en-us.md index 3c2a3f916..89d92b256 100644 --- a/docs/content/doc/features/comparison.en-us.md +++ b/docs/content/doc/features/comparison.en-us.md @@ -53,6 +53,8 @@ _Symbols used in table:_ | WebAuthn (2FA) | ✓ | ✘ | ✓ | ✓ | ✓ | ✓ | ? | | Built-in CI/CD | ✘ | ✘ | ✓ | ✓ | ✓ | ✘ | ✘ | | Subgroups: groups within groups | [✘](https://github.com/go-gitea/gitea/issues/1872) | ✘ | ✘ | ✓ | ✓ | ✘ | ✓ | +| Mermaid diagrams in Markdown | ✓ | ✘ | ✓ | ✓ | ✓ | ✘ | ✘ | +| Math syntax in Markdown | ✓ | ✘ | ✓ | ✓ | ✓ | ✘ | ✘ | ## Code management diff --git a/docs/content/page/index.en-us.md b/docs/content/page/index.en-us.md index 8e2e36223..c3ee996f0 100644 --- a/docs/content/page/index.en-us.md +++ b/docs/content/page/index.en-us.md @@ -131,7 +131,8 @@ You can try it out using [the online demo](https://try.gitea.io/). - Environment variables - Command line options - Multi-language support ([21 languages](https://github.com/go-gitea/gitea/tree/main/options/locale)) -- [Mermaid](https://mermaidjs.github.io/) Diagram support +- [Mermaid](https://mermaidjs.github.io/) diagrams in Markdown +- Math syntax in Markdown - Mail service - Notifications - Registration confirmation diff --git a/go.mod b/go.mod index 0e93ea443..8976900d9 100644 --- a/go.mod +++ b/go.mod @@ -103,6 +103,7 @@ require ( gopkg.in/gomail.v2 v2.0.0-20160411212932-81ebce5c23df gopkg.in/ini.v1 v1.67.0 gopkg.in/yaml.v2 v2.4.0 + gopkg.in/yaml.v3 v3.0.1 mvdan.cc/xurls/v2 v2.4.0 strk.kbt.io/projects/go/libravatar v0.0.0-20191008002943-06d1c002b251 xorm.io/builder v0.3.11 @@ -290,7 +291,6 @@ require ( gopkg.in/alexcesaro/quotedprintable.v3 v3.0.0-20150716171945-2caba252f4dc // indirect gopkg.in/cheggaaa/pb.v1 v1.0.28 // indirect gopkg.in/warnings.v0 v0.1.2 // indirect - gopkg.in/yaml.v3 v3.0.1 // indirect sigs.k8s.io/yaml v1.2.0 // indirect ) diff --git a/modules/markup/markdown/convertyaml.go b/modules/markup/markdown/convertyaml.go new file mode 100644 index 000000000..3f5ebec90 --- /dev/null +++ b/modules/markup/markdown/convertyaml.go @@ -0,0 +1,84 @@ +// Copyright 2022 The Gitea Authors. All rights reserved. +// Use of this source code is governed by a MIT-style +// license that can be found in the LICENSE file. + +package markdown + +import ( + "github.com/yuin/goldmark/ast" + east "github.com/yuin/goldmark/extension/ast" + "gopkg.in/yaml.v3" +) + +func nodeToTable(meta *yaml.Node) ast.Node { + for { + if meta == nil { + return nil + } + switch meta.Kind { + case yaml.DocumentNode: + meta = meta.Content[0] + continue + default: + } + break + } + switch meta.Kind { + case yaml.MappingNode: + return mappingNodeToTable(meta) + case yaml.SequenceNode: + return sequenceNodeToTable(meta) + default: + return ast.NewString([]byte(meta.Value)) + } +} + +func mappingNodeToTable(meta *yaml.Node) ast.Node { + table := east.NewTable() + alignments := []east.Alignment{} + for i := 0; i < len(meta.Content); i += 2 { + alignments = append(alignments, east.AlignNone) + } + + headerRow := east.NewTableRow(alignments) + valueRow := east.NewTableRow(alignments) + for i := 0; i < len(meta.Content); i += 2 { + cell := east.NewTableCell() + + cell.AppendChild(cell, nodeToTable(meta.Content[i])) + headerRow.AppendChild(headerRow, cell) + + if i+1 < len(meta.Content) { + cell = east.NewTableCell() + cell.AppendChild(cell, nodeToTable(meta.Content[i+1])) + valueRow.AppendChild(valueRow, cell) + } + } + + table.AppendChild(table, east.NewTableHeader(headerRow)) + table.AppendChild(table, valueRow) + return table +} + +func sequenceNodeToTable(meta *yaml.Node) ast.Node { + table := east.NewTable() + alignments := []east.Alignment{east.AlignNone} + for _, item := range meta.Content { + row := east.NewTableRow(alignments) + cell := east.NewTableCell() + cell.AppendChild(cell, nodeToTable(item)) + row.AppendChild(row, cell) + table.AppendChild(table, row) + } + return table +} + +func nodeToDetails(meta *yaml.Node, icon string) ast.Node { + details := NewDetails() + summary := NewSummary() + summary.AppendChild(summary, NewIcon(icon)) + details.AppendChild(details, summary) + details.AppendChild(details, nodeToTable(meta)) + + return details +} diff --git a/modules/markup/markdown/goldmark.go b/modules/markup/markdown/goldmark.go index 1750128de..24f1ab7a0 100644 --- a/modules/markup/markdown/goldmark.go +++ b/modules/markup/markdown/goldmark.go @@ -15,7 +15,6 @@ import ( "code.gitea.io/gitea/modules/setting" giteautil "code.gitea.io/gitea/modules/util" - meta "github.com/yuin/goldmark-meta" "github.com/yuin/goldmark/ast" east "github.com/yuin/goldmark/extension/ast" "github.com/yuin/goldmark/parser" @@ -32,20 +31,12 @@ type ASTTransformer struct{} // Transform transforms the given AST tree. func (g *ASTTransformer) Transform(node *ast.Document, reader text.Reader, pc parser.Context) { - metaData := meta.GetItems(pc) firstChild := node.FirstChild() createTOC := false ctx := pc.Get(renderContextKey).(*markup.RenderContext) - rc := &RenderConfig{ - Meta: "table", - Icon: "table", - Lang: "", - } - - if metaData != nil { - rc.ToRenderConfig(metaData) - - metaNode := rc.toMetaNode(metaData) + rc := pc.Get(renderConfigKey).(*RenderConfig) + if rc.yamlNode != nil { + metaNode := rc.toMetaNode() if metaNode != nil { node.InsertBefore(node, firstChild, metaNode) } diff --git a/modules/markup/markdown/markdown.go b/modules/markup/markdown/markdown.go index 4ce85dfc3..c0e72fd6c 100644 --- a/modules/markup/markdown/markdown.go +++ b/modules/markup/markdown/markdown.go @@ -14,6 +14,7 @@ import ( "code.gitea.io/gitea/modules/log" "code.gitea.io/gitea/modules/markup" "code.gitea.io/gitea/modules/markup/common" + "code.gitea.io/gitea/modules/markup/markdown/math" "code.gitea.io/gitea/modules/setting" giteautil "code.gitea.io/gitea/modules/util" @@ -38,6 +39,7 @@ var ( isWikiKey = parser.NewContextKey() renderMetasKey = parser.NewContextKey() renderContextKey = parser.NewContextKey() + renderConfigKey = parser.NewContextKey() ) type limitWriter struct { @@ -98,7 +100,7 @@ func actualRender(ctx *markup.RenderContext, input io.Reader, output io.Writer) languageStr := string(language) preClasses := []string{"code-block"} - if languageStr == "mermaid" { + if languageStr == "mermaid" || languageStr == "math" { preClasses = append(preClasses, "is-loading") } @@ -120,6 +122,9 @@ func actualRender(ctx *markup.RenderContext, input io.Reader, output io.Writer) } }), ), + math.NewExtension( + math.Enabled(setting.Markdown.EnableMath), + ), meta.Meta, ), goldmark.WithParserOptions( @@ -167,7 +172,18 @@ func actualRender(ctx *markup.RenderContext, input io.Reader, output io.Writer) log.Error("Unable to ReadAll: %v", err) return err } - if err := converter.Convert(giteautil.NormalizeEOL(buf), lw, parser.WithContext(pc)); err != nil { + buf = giteautil.NormalizeEOL(buf) + + rc := &RenderConfig{ + Meta: "table", + Icon: "table", + Lang: "", + } + buf, _ = ExtractMetadataBytes(buf, rc) + + pc.Set(renderConfigKey, rc) + + if err := converter.Convert(buf, lw, parser.WithContext(pc)); err != nil { log.Error("Unable to render: %v", err) return err } diff --git a/modules/markup/markdown/math/block_node.go b/modules/markup/markdown/math/block_node.go new file mode 100644 index 000000000..bd8449bab --- /dev/null +++ b/modules/markup/markdown/math/block_node.go @@ -0,0 +1,42 @@ +// Copyright 2022 The Gitea Authors. All rights reserved. +// Use of this source code is governed by a MIT-style +// license that can be found in the LICENSE file. + +package math + +import "github.com/yuin/goldmark/ast" + +// Block represents a display math block e.g. $$...$$ or \[...\] +type Block struct { + ast.BaseBlock + Dollars bool + Indent int + Closed bool +} + +// KindBlock is the node kind for math blocks +var KindBlock = ast.NewNodeKind("MathBlock") + +// NewBlock creates a new math Block +func NewBlock(dollars bool, indent int) *Block { + return &Block{ + Dollars: dollars, + Indent: indent, + } +} + +// Dump dumps the block to a string +func (n *Block) Dump(source []byte, level int) { + m := map[string]string{} + ast.DumpHelper(n, source, level, m, nil) +} + +// Kind returns KindBlock for math Blocks +func (n *Block) Kind() ast.NodeKind { + return KindBlock +} + +// IsRaw returns true as this block should not be processed further +func (n *Block) IsRaw() bool { + return true +} diff --git a/modules/markup/markdown/math/block_parser.go b/modules/markup/markdown/math/block_parser.go new file mode 100644 index 000000000..f86512288 --- /dev/null +++ b/modules/markup/markdown/math/block_parser.go @@ -0,0 +1,123 @@ +// Copyright 2022 The Gitea Authors. All rights reserved. +// Use of this source code is governed by a MIT-style +// license that can be found in the LICENSE file. + +package math + +import ( + "bytes" + + "github.com/yuin/goldmark/ast" + "github.com/yuin/goldmark/parser" + "github.com/yuin/goldmark/text" + "github.com/yuin/goldmark/util" +) + +type blockParser struct { + parseDollars bool +} + +// NewBlockParser creates a new math BlockParser +func NewBlockParser(parseDollarBlocks bool) parser.BlockParser { + return &blockParser{ + parseDollars: parseDollarBlocks, + } +} + +// Open parses the current line and returns a result of parsing. +func (b *blockParser) Open(parent ast.Node, reader text.Reader, pc parser.Context) (ast.Node, parser.State) { + line, segment := reader.PeekLine() + pos := pc.BlockOffset() + if pos == -1 || len(line[pos:]) < 2 { + return nil, parser.NoChildren + } + + dollars := false + if b.parseDollars && line[pos] == '$' && line[pos+1] == '$' { + dollars = true + } else if line[pos] != '\\' || line[pos+1] != '[' { + return nil, parser.NoChildren + } + + node := NewBlock(dollars, pos) + + // Now we need to check if the ending block is on the segment... + endBytes := []byte{'\\', ']'} + if dollars { + endBytes = []byte{'$', '$'} + } + idx := bytes.Index(line[pos+2:], endBytes) + if idx >= 0 { + segment.Stop = segment.Start + idx + 2 + reader.Advance(segment.Len() - 1) + segment.Start += 2 + node.Lines().Append(segment) + node.Closed = true + return node, parser.Close | parser.NoChildren + } + + reader.Advance(segment.Len() - 1) + segment.Start += 2 + node.Lines().Append(segment) + return node, parser.NoChildren +} + +// Continue parses the current line and returns a result of parsing. +func (b *blockParser) Continue(node ast.Node, reader text.Reader, pc parser.Context) parser.State { + block := node.(*Block) + if block.Closed { + return parser.Close + } + + line, segment := reader.PeekLine() + w, pos := util.IndentWidth(line, 0) + if w < 4 { + if block.Dollars { + i := pos + for ; i < len(line) && line[i] == '$'; i++ { + } + length := i - pos + if length >= 2 && util.IsBlank(line[i:]) { + reader.Advance(segment.Stop - segment.Start - segment.Padding) + block.Closed = true + return parser.Close + } + } else if len(line[pos:]) > 1 && line[pos] == '\\' && line[pos+1] == ']' && util.IsBlank(line[pos+2:]) { + reader.Advance(segment.Stop - segment.Start - segment.Padding) + block.Closed = true + return parser.Close + } + } + + pos, padding := util.IndentPosition(line, 0, block.Indent) + seg := text.NewSegmentPadding(segment.Start+pos, segment.Stop, padding) + node.Lines().Append(seg) + reader.AdvanceAndSetPadding(segment.Stop-segment.Start-pos-1, padding) + return parser.Continue | parser.NoChildren +} + +// Close will be called when the parser returns Close. +func (b *blockParser) Close(node ast.Node, reader text.Reader, pc parser.Context) { + // noop +} + +// CanInterruptParagraph returns true if the parser can interrupt paragraphs, +// otherwise false. +func (b *blockParser) CanInterruptParagraph() bool { + return true +} + +// CanAcceptIndentedLine returns true if the parser can open new node when +// the given line is being indented more than 3 spaces. +func (b *blockParser) CanAcceptIndentedLine() bool { + return false +} + +// Trigger returns a list of characters that triggers Parse method of +// this parser. +// If Trigger returns a nil, Open will be called with any lines. +// +// We leave this as nil as our parse method is quick enough +func (b *blockParser) Trigger() []byte { + return nil +} diff --git a/modules/markup/markdown/math/block_renderer.go b/modules/markup/markdown/math/block_renderer.go new file mode 100644 index 000000000..d50206525 --- /dev/null +++ b/modules/markup/markdown/math/block_renderer.go @@ -0,0 +1,43 @@ +// Copyright 2022 The Gitea Authors. All rights reserved. +// Use of this source code is governed by a MIT-style +// license that can be found in the LICENSE file. + +package math + +import ( + gast "github.com/yuin/goldmark/ast" + "github.com/yuin/goldmark/renderer" + "github.com/yuin/goldmark/util" +) + +// BlockRenderer represents a renderer for math Blocks +type BlockRenderer struct{} + +// NewBlockRenderer creates a new renderer for math Blocks +func NewBlockRenderer() renderer.NodeRenderer { + return &BlockRenderer{} +} + +// RegisterFuncs registers the renderer for math Blocks +func (r *BlockRenderer) RegisterFuncs(reg renderer.NodeRendererFuncRegisterer) { + reg.Register(KindBlock, r.renderBlock) +} + +func (r *BlockRenderer) writeLines(w util.BufWriter, source []byte, n gast.Node) { + l := n.Lines().Len() + for i := 0; i < l; i++ { + line := n.Lines().At(i) + _, _ = w.Write(util.EscapeHTML(line.Value(source))) + } +} + +func (r *BlockRenderer) renderBlock(w util.BufWriter, source []byte, node gast.Node, entering bool) (gast.WalkStatus, error) { + n := node.(*Block) + if entering { + _, _ = w.WriteString(`
`)
+		r.writeLines(w, source, n)
+	} else {
+		_, _ = w.WriteString(`
` + "\n") + } + return gast.WalkContinue, nil +} diff --git a/modules/markup/markdown/math/inline_node.go b/modules/markup/markdown/math/inline_node.go new file mode 100644 index 000000000..245ff8dab --- /dev/null +++ b/modules/markup/markdown/math/inline_node.go @@ -0,0 +1,49 @@ +// Copyright 2022 The Gitea Authors. All rights reserved. +// Use of this source code is governed by a MIT-style +// license that can be found in the LICENSE file. + +package math + +import ( + "github.com/yuin/goldmark/ast" + "github.com/yuin/goldmark/util" +) + +// Inline represents inline math e.g. $...$ or \(...\) +type Inline struct { + ast.BaseInline +} + +// Inline implements Inline.Inline. +func (n *Inline) Inline() {} + +// IsBlank returns if this inline node is empty +func (n *Inline) IsBlank(source []byte) bool { + for c := n.FirstChild(); c != nil; c = c.NextSibling() { + text := c.(*ast.Text).Segment + if !util.IsBlank(text.Value(source)) { + return false + } + } + return true +} + +// Dump renders this inline math as debug +func (n *Inline) Dump(source []byte, level int) { + ast.DumpHelper(n, source, level, nil, nil) +} + +// KindInline is the kind for math inline +var KindInline = ast.NewNodeKind("MathInline") + +// Kind returns KindInline +func (n *Inline) Kind() ast.NodeKind { + return KindInline +} + +// NewInline creates a new ast math inline node +func NewInline() *Inline { + return &Inline{ + BaseInline: ast.BaseInline{}, + } +} diff --git a/modules/markup/markdown/math/inline_parser.go b/modules/markup/markdown/math/inline_parser.go new file mode 100644 index 000000000..0339674b6 --- /dev/null +++ b/modules/markup/markdown/math/inline_parser.go @@ -0,0 +1,99 @@ +// Copyright 2022 The Gitea Authors. All rights reserved. +// Use of this source code is governed by a MIT-style +// license that can be found in the LICENSE file. + +package math + +import ( + "bytes" + + "github.com/yuin/goldmark/ast" + "github.com/yuin/goldmark/parser" + "github.com/yuin/goldmark/text" +) + +type inlineParser struct { + start []byte + end []byte +} + +var defaultInlineDollarParser = &inlineParser{ + start: []byte{'$'}, + end: []byte{'$'}, +} + +// NewInlineDollarParser returns a new inline parser +func NewInlineDollarParser() parser.InlineParser { + return defaultInlineDollarParser +} + +var defaultInlineBracketParser = &inlineParser{ + start: []byte{'\\', '('}, + end: []byte{'\\', ')'}, +} + +// NewInlineDollarParser returns a new inline parser +func NewInlineBracketParser() parser.InlineParser { + return defaultInlineBracketParser +} + +// Trigger triggers this parser on $ +func (parser *inlineParser) Trigger() []byte { + return parser.start[0:1] +} + +func isAlphanumeric(b byte) bool { + // Github only cares about 0-9A-Za-z + return (b >= '0' && b <= '9') || (b >= 'A' && b <= 'Z') || (b >= 'a' && b <= 'z') +} + +// Parse parses the current line and returns a result of parsing. +func (parser *inlineParser) Parse(parent ast.Node, block text.Reader, pc parser.Context) ast.Node { + line, _ := block.PeekLine() + opener := bytes.Index(line, parser.start) + if opener < 0 { + return nil + } + if opener != 0 && isAlphanumeric(line[opener-1]) { + return nil + } + + opener += len(parser.start) + ender := bytes.Index(line[opener:], parser.end) + if ender < 0 { + return nil + } + if len(line) > opener+ender+len(parser.end) && isAlphanumeric(line[opener+ender+len(parser.end)]) { + return nil + } + + block.Advance(opener) + _, pos := block.Position() + node := NewInline() + segment := pos.WithStop(pos.Start + ender) + node.AppendChild(node, ast.NewRawTextSegment(segment)) + block.Advance(ender + len(parser.end)) + + trimBlock(node, block) + return node +} + +func trimBlock(node *Inline, block text.Reader) { + if node.IsBlank(block.Source()) { + return + } + + // trim first space and last space + first := node.FirstChild().(*ast.Text) + if !(!first.Segment.IsEmpty() && block.Source()[first.Segment.Start] == ' ') { + return + } + + last := node.LastChild().(*ast.Text) + if !(!last.Segment.IsEmpty() && block.Source()[last.Segment.Stop-1] == ' ') { + return + } + + first.Segment = first.Segment.WithStart(first.Segment.Start + 1) + last.Segment = last.Segment.WithStop(last.Segment.Stop - 1) +} diff --git a/modules/markup/markdown/math/inline_renderer.go b/modules/markup/markdown/math/inline_renderer.go new file mode 100644 index 000000000..e4c0f3761 --- /dev/null +++ b/modules/markup/markdown/math/inline_renderer.go @@ -0,0 +1,47 @@ +// Copyright 2022 The Gitea Authors. All rights reserved. +// Use of this source code is governed by a MIT-style +// license that can be found in the LICENSE file. + +package math + +import ( + "bytes" + + "github.com/yuin/goldmark/ast" + "github.com/yuin/goldmark/renderer" + "github.com/yuin/goldmark/util" +) + +// InlineRenderer is an inline renderer +type InlineRenderer struct{} + +// NewInlineRenderer returns a new renderer for inline math +func NewInlineRenderer() renderer.NodeRenderer { + return &InlineRenderer{} +} + +func (r *InlineRenderer) renderInline(w util.BufWriter, source []byte, n ast.Node, entering bool) (ast.WalkStatus, error) { + if entering { + _, _ = w.WriteString(``) + for c := n.FirstChild(); c != nil; c = c.NextSibling() { + segment := c.(*ast.Text).Segment + value := util.EscapeHTML(segment.Value(source)) + if bytes.HasSuffix(value, []byte("\n")) { + _, _ = w.Write(value[:len(value)-1]) + if c != n.LastChild() { + _, _ = w.Write([]byte(" ")) + } + } else { + _, _ = w.Write(value) + } + } + return ast.WalkSkipChildren, nil + } + _, _ = w.WriteString(``) + return ast.WalkContinue, nil +} + +// RegisterFuncs registers the renderer for inline math nodes +func (r *InlineRenderer) RegisterFuncs(reg renderer.NodeRendererFuncRegisterer) { + reg.Register(KindInline, r.renderInline) +} diff --git a/modules/markup/markdown/math/math.go b/modules/markup/markdown/math/math.go new file mode 100644 index 000000000..7854ac84d --- /dev/null +++ b/modules/markup/markdown/math/math.go @@ -0,0 +1,108 @@ +// Copyright 2022 The Gitea Authors. All rights reserved. +// Use of this source code is governed by a MIT-style +// license that can be found in the LICENSE file. + +package math + +import ( + "github.com/yuin/goldmark" + "github.com/yuin/goldmark/parser" + "github.com/yuin/goldmark/renderer" + "github.com/yuin/goldmark/util" +) + +// Extension is a math extension +type Extension struct { + enabled bool + parseDollarInline bool + parseDollarBlock bool +} + +// Option is the interface Options should implement +type Option interface { + SetOption(e *Extension) +} + +type extensionFunc func(e *Extension) + +func (fn extensionFunc) SetOption(e *Extension) { + fn(e) +} + +// Enabled enables or disables this extension +func Enabled(enable ...bool) Option { + value := true + if len(enable) > 0 { + value = enable[0] + } + return extensionFunc(func(e *Extension) { + e.enabled = value + }) +} + +// WithInlineDollarParser enables or disables the parsing of $...$ +func WithInlineDollarParser(enable ...bool) Option { + value := true + if len(enable) > 0 { + value = enable[0] + } + return extensionFunc(func(e *Extension) { + e.parseDollarInline = value + }) +} + +// WithBlockDollarParser enables or disables the parsing of $$...$$ +func WithBlockDollarParser(enable ...bool) Option { + value := true + if len(enable) > 0 { + value = enable[0] + } + return extensionFunc(func(e *Extension) { + e.parseDollarBlock = value + }) +} + +// Math represents a math extension with default rendered delimiters +var Math = &Extension{ + enabled: true, + parseDollarBlock: true, + parseDollarInline: true, +} + +// NewExtension creates a new math extension with the provided options +func NewExtension(opts ...Option) *Extension { + r := &Extension{ + enabled: true, + parseDollarBlock: true, + parseDollarInline: true, + } + + for _, o := range opts { + o.SetOption(r) + } + return r +} + +// Extend extends goldmark with our parsers and renderers +func (e *Extension) Extend(m goldmark.Markdown) { + if !e.enabled { + return + } + + m.Parser().AddOptions(parser.WithBlockParsers( + util.Prioritized(NewBlockParser(e.parseDollarBlock), 701), + )) + + inlines := []util.PrioritizedValue{ + util.Prioritized(NewInlineBracketParser(), 501), + } + if e.parseDollarInline { + inlines = append(inlines, util.Prioritized(NewInlineDollarParser(), 501)) + } + m.Parser().AddOptions(parser.WithInlineParsers(inlines...)) + + m.Renderer().AddOptions(renderer.WithNodeRenderers( + util.Prioritized(NewBlockRenderer(), 501), + util.Prioritized(NewInlineRenderer(), 502), + )) +} diff --git a/modules/markup/markdown/meta.go b/modules/markup/markdown/meta.go index faf92ae2c..28913fd68 100644 --- a/modules/markup/markdown/meta.go +++ b/modules/markup/markdown/meta.go @@ -5,47 +5,101 @@ package markdown import ( + "bytes" "errors" - "strings" + "unicode" + "unicode/utf8" - "gopkg.in/yaml.v2" + "code.gitea.io/gitea/modules/log" + "gopkg.in/yaml.v3" ) -func isYAMLSeparator(line string) bool { - line = strings.TrimSpace(line) - for i := 0; i < len(line); i++ { - if line[i] != '-' { +func isYAMLSeparator(line []byte) bool { + idx := 0 + for ; idx < len(line); idx++ { + if line[idx] >= utf8.RuneSelf { + r, sz := utf8.DecodeRune(line[idx:]) + if !unicode.IsSpace(r) { + return false + } + idx += sz + continue + } + if line[idx] != ' ' { + break + } + } + dashCount := 0 + for ; idx < len(line); idx++ { + if line[idx] != '-' { + break + } + dashCount++ + } + if dashCount < 3 { + return false + } + for ; idx < len(line); idx++ { + if line[idx] >= utf8.RuneSelf { + r, sz := utf8.DecodeRune(line[idx:]) + if !unicode.IsSpace(r) { + return false + } + idx += sz + continue + } + if line[idx] != ' ' { return false } } - return len(line) > 2 + return true } // ExtractMetadata consumes a markdown file, parses YAML frontmatter, // and returns the frontmatter metadata separated from the markdown content func ExtractMetadata(contents string, out interface{}) (string, error) { - var front, body []string - lines := strings.Split(contents, "\n") - for idx, line := range lines { - if idx == 0 { - // First line has to be a separator - if !isYAMLSeparator(line) { - return "", errors.New("frontmatter must start with a separator line") - } - continue + body, err := ExtractMetadataBytes([]byte(contents), out) + return string(body), err +} + +// ExtractMetadata consumes a markdown file, parses YAML frontmatter, +// and returns the frontmatter metadata separated from the markdown content +func ExtractMetadataBytes(contents []byte, out interface{}) ([]byte, error) { + var front, body []byte + + start, end := 0, len(contents) + idx := bytes.IndexByte(contents[start:], '\n') + if idx >= 0 { + end = start + idx + } + line := contents[start:end] + + if !isYAMLSeparator(line) { + return contents, errors.New("frontmatter must start with a separator line") + } + frontMatterStart := end + 1 + for start = frontMatterStart; start < len(contents); start = end + 1 { + end = len(contents) + idx := bytes.IndexByte(contents[start:], '\n') + if idx >= 0 { + end = start + idx } + line := contents[start:end] if isYAMLSeparator(line) { - front, body = lines[1:idx], lines[idx+1:] + front = contents[frontMatterStart:start] + body = contents[end+1:] break } } if len(front) == 0 { - return "", errors.New("could not determine metadata") + return contents, errors.New("could not determine metadata") } - if err := yaml.Unmarshal([]byte(strings.Join(front, "\n")), out); err != nil { - return "", err + log.Info("%s", string(front)) + + if err := yaml.Unmarshal(front, out); err != nil { + return contents, err } - return strings.Join(body, "\n"), nil + return body, nil } diff --git a/modules/markup/markdown/meta_test.go b/modules/markup/markdown/meta_test.go index 939646f8f..9332b35b4 100644 --- a/modules/markup/markdown/meta_test.go +++ b/modules/markup/markdown/meta_test.go @@ -56,6 +56,38 @@ func TestExtractMetadata(t *testing.T) { }) } +func TestExtractMetadataBytes(t *testing.T) { + t.Run("ValidFrontAndBody", func(t *testing.T) { + var meta structs.IssueTemplate + body, err := ExtractMetadataBytes([]byte(fmt.Sprintf("%s\n%s\n%s\n%s", sepTest, frontTest, sepTest, bodyTest)), &meta) + assert.NoError(t, err) + assert.Equal(t, bodyTest, body) + assert.Equal(t, metaTest, meta) + assert.True(t, validateMetadata(meta)) + }) + + t.Run("NoFirstSeparator", func(t *testing.T) { + var meta structs.IssueTemplate + _, err := ExtractMetadataBytes([]byte(fmt.Sprintf("%s\n%s\n%s", frontTest, sepTest, bodyTest)), &meta) + assert.Error(t, err) + }) + + t.Run("NoLastSeparator", func(t *testing.T) { + var meta structs.IssueTemplate + _, err := ExtractMetadataBytes([]byte(fmt.Sprintf("%s\n%s\n%s", sepTest, frontTest, bodyTest)), &meta) + assert.Error(t, err) + }) + + t.Run("NoBody", func(t *testing.T) { + var meta structs.IssueTemplate + body, err := ExtractMetadataBytes([]byte(fmt.Sprintf("%s\n%s\n%s", sepTest, frontTest, sepTest)), &meta) + assert.NoError(t, err) + assert.Equal(t, "", body) + assert.Equal(t, metaTest, meta) + assert.True(t, validateMetadata(meta)) + }) +} + var ( sepTest = "-----" frontTest = `name: Test diff --git a/modules/markup/markdown/renderconfig.go b/modules/markup/markdown/renderconfig.go index bef67e9e5..6a3b3a1bd 100644 --- a/modules/markup/markdown/renderconfig.go +++ b/modules/markup/markdown/renderconfig.go @@ -5,159 +5,114 @@ package markdown import ( - "fmt" "strings" + "code.gitea.io/gitea/modules/log" "github.com/yuin/goldmark/ast" - east "github.com/yuin/goldmark/extension/ast" - "gopkg.in/yaml.v2" + "gopkg.in/yaml.v3" ) // RenderConfig represents rendering configuration for this file type RenderConfig struct { - Meta string - Icon string - TOC bool - Lang string + Meta string + Icon string + TOC bool + Lang string + yamlNode *yaml.Node } -// ToRenderConfig converts a yaml.MapSlice to a RenderConfig -func (rc *RenderConfig) ToRenderConfig(meta yaml.MapSlice) { - if meta == nil { - return +// UnmarshalYAML implement yaml.v3 UnmarshalYAML +func (rc *RenderConfig) UnmarshalYAML(value *yaml.Node) error { + if rc == nil { + rc = &RenderConfig{ + Meta: "table", + Icon: "table", + Lang: "", + } } - found := false - var giteaMetaControl yaml.MapItem - for _, item := range meta { - strKey, ok := item.Key.(string) - if !ok { - continue - } - strKey = strings.TrimSpace(strings.ToLower(strKey)) - switch strKey { - case "gitea": - giteaMetaControl = item - found = true - case "include_toc": - val, ok := item.Value.(bool) - if !ok { - continue - } - rc.TOC = val - case "lang": - val, ok := item.Value.(string) - if !ok { - continue - } - val = strings.TrimSpace(val) - if len(val) == 0 { - continue - } - rc.Lang = val - } + rc.yamlNode = value + + type basicRenderConfig struct { + Gitea *yaml.Node `yaml:"gitea"` + TOC bool `yaml:"include_toc"` + Lang string `yaml:"lang"` } - if found { - switch v := giteaMetaControl.Value.(type) { - case string: - switch v { - case "none": - rc.Meta = "none" - case "table": - rc.Meta = "table" - default: // "details" - rc.Meta = "details" - } - case yaml.MapSlice: - for _, item := range v { - strKey, ok := item.Key.(string) - if !ok { - continue - } - strKey = strings.TrimSpace(strings.ToLower(strKey)) - switch strKey { - case "meta": - val, ok := item.Value.(string) - if !ok { - continue - } - switch strings.TrimSpace(strings.ToLower(val)) { - case "none": - rc.Meta = "none" - case "table": - rc.Meta = "table" - default: // "details" - rc.Meta = "details" - } - case "details_icon": - val, ok := item.Value.(string) - if !ok { - continue - } - rc.Icon = strings.TrimSpace(strings.ToLower(val)) - case "include_toc": - val, ok := item.Value.(bool) - if !ok { - continue - } - rc.TOC = val - case "lang": - val, ok := item.Value.(string) - if !ok { - continue - } - val = strings.TrimSpace(val) - if len(val) == 0 { - continue - } - rc.Lang = val - } - } - } + var basic basicRenderConfig + + err := value.Decode(&basic) + if err != nil { + return err } + + if basic.Lang != "" { + rc.Lang = basic.Lang + } + + rc.TOC = basic.TOC + if basic.Gitea == nil { + return nil + } + + var control *string + if err := basic.Gitea.Decode(&control); err == nil && control != nil { + log.Info("control %v", control) + switch strings.TrimSpace(strings.ToLower(*control)) { + case "none": + rc.Meta = "none" + case "table": + rc.Meta = "table" + default: // "details" + rc.Meta = "details" + } + return nil + } + + type giteaControl struct { + Meta string `yaml:"meta"` + Icon string `yaml:"details_icon"` + TOC *yaml.Node `yaml:"include_toc"` + Lang string `yaml:"lang"` + } + + var controlStruct *giteaControl + if err := basic.Gitea.Decode(controlStruct); err != nil || controlStruct == nil { + return err + } + + switch strings.TrimSpace(strings.ToLower(controlStruct.Meta)) { + case "none": + rc.Meta = "none" + case "table": + rc.Meta = "table" + default: // "details" + rc.Meta = "details" + } + + rc.Icon = strings.TrimSpace(strings.ToLower(controlStruct.Icon)) + + if controlStruct.Lang != "" { + rc.Lang = controlStruct.Lang + } + + var toc bool + if err := controlStruct.TOC.Decode(&toc); err == nil { + rc.TOC = toc + } + + return nil } -func (rc *RenderConfig) toMetaNode(meta yaml.MapSlice) ast.Node { +func (rc *RenderConfig) toMetaNode() ast.Node { + if rc.yamlNode == nil { + return nil + } switch rc.Meta { case "table": - return metaToTable(meta) + return nodeToTable(rc.yamlNode) case "details": - return metaToDetails(meta, rc.Icon) + return nodeToDetails(rc.yamlNode, rc.Icon) default: return nil } } - -func metaToTable(meta yaml.MapSlice) ast.Node { - table := east.NewTable() - alignments := []east.Alignment{} - for range meta { - alignments = append(alignments, east.AlignNone) - } - row := east.NewTableRow(alignments) - for _, item := range meta { - cell := east.NewTableCell() - cell.AppendChild(cell, ast.NewString([]byte(fmt.Sprintf("%v", item.Key)))) - row.AppendChild(row, cell) - } - table.AppendChild(table, east.NewTableHeader(row)) - - row = east.NewTableRow(alignments) - for _, item := range meta { - cell := east.NewTableCell() - cell.AppendChild(cell, ast.NewString([]byte(fmt.Sprintf("%v", item.Value)))) - row.AppendChild(row, cell) - } - table.AppendChild(table, row) - return table -} - -func metaToDetails(meta yaml.MapSlice, icon string) ast.Node { - details := NewDetails() - summary := NewSummary() - summary.AppendChild(summary, NewIcon(icon)) - details.AppendChild(details, summary) - details.AppendChild(details, metaToTable(meta)) - - return details -} diff --git a/modules/markup/markdown/renderconfig_test.go b/modules/markup/markdown/renderconfig_test.go new file mode 100644 index 000000000..1027035cd --- /dev/null +++ b/modules/markup/markdown/renderconfig_test.go @@ -0,0 +1,162 @@ +// Copyright 2022 The Gitea Authors. All rights reserved. +// Use of this source code is governed by a MIT-style +// license that can be found in the LICENSE file. + +package markdown + +import ( + "testing" + + "gopkg.in/yaml.v3" +) + +func TestRenderConfig_UnmarshalYAML(t *testing.T) { + tests := []struct { + name string + expected *RenderConfig + args string + }{ + { + "empty", &RenderConfig{ + Meta: "table", + Icon: "table", + Lang: "", + }, "", + }, + { + "lang", &RenderConfig{ + Meta: "table", + Icon: "table", + Lang: "test", + }, "lang: test", + }, + { + "metatable", &RenderConfig{ + Meta: "table", + Icon: "table", + Lang: "", + }, "gitea: table", + }, + { + "metanone", &RenderConfig{ + Meta: "none", + Icon: "table", + Lang: "", + }, "gitea: none", + }, + { + "metadetails", &RenderConfig{ + Meta: "details", + Icon: "table", + Lang: "", + }, "gitea: details", + }, + { + "metawrong", &RenderConfig{ + Meta: "details", + Icon: "table", + Lang: "", + }, "gitea: wrong", + }, + { + "toc", &RenderConfig{ + TOC: true, + Meta: "table", + Icon: "table", + Lang: "", + }, "include_toc: true", + }, + { + "tocfalse", &RenderConfig{ + TOC: false, + Meta: "table", + Icon: "table", + Lang: "", + }, "include_toc: false", + }, + { + "toclang", &RenderConfig{ + Meta: "table", + Icon: "table", + TOC: true, + Lang: "testlang", + }, ` + include_toc: true + lang: testlang +`, + }, + { + "complexlang", &RenderConfig{ + Meta: "table", + Icon: "table", + Lang: "testlang", + }, ` + gitea: + lang: testlang +`, + }, + { + "complexlang2", &RenderConfig{ + Meta: "table", + Icon: "table", + Lang: "testlang", + }, ` + lang: notright + gitea: + lang: testlang +`, + }, + { + "complexlang", &RenderConfig{ + Meta: "table", + Icon: "table", + Lang: "testlang", + }, ` + gitea: + lang: testlang +`, + }, + { + "complex2", &RenderConfig{ + Lang: "two", + Meta: "table", + TOC: true, + Icon: "smiley", + }, ` + lang: one + include_toc: true + gitea: + details_icon: smiley + meta: table + include_toc: true + lang: two +`, + }, + } + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + got := &RenderConfig{ + Meta: "table", + Icon: "table", + Lang: "", + } + if err := yaml.Unmarshal([]byte(tt.args), got); err != nil { + t.Errorf("RenderConfig.UnmarshalYAML() error = %v", err) + return + } + + if got.Meta != tt.expected.Meta { + t.Errorf("Meta Expected %s Got %s", tt.expected.Meta, got.Meta) + } + if got.Icon != tt.expected.Icon { + t.Errorf("Icon Expected %s Got %s", tt.expected.Icon, got.Icon) + } + if got.Lang != tt.expected.Lang { + t.Errorf("Lang Expected %s Got %s", tt.expected.Lang, got.Lang) + } + if got.TOC != tt.expected.TOC { + t.Errorf("TOC Expected %t Got %t", tt.expected.TOC, got.TOC) + } + }) + } +} diff --git a/modules/markup/sanitizer.go b/modules/markup/sanitizer.go index 57e88fdab..807a8a789 100644 --- a/modules/markup/sanitizer.go +++ b/modules/markup/sanitizer.go @@ -56,7 +56,7 @@ func createDefaultPolicy() *bluemonday.Policy { policy.AllowAttrs("class").Matching(regexp.MustCompile(`^code-block( is-loading)?$`)).OnElements("pre") // For Chroma markdown plugin - policy.AllowAttrs("class").Matching(regexp.MustCompile(`^(chroma )?language-[\w-]+$`)).OnElements("code") + policy.AllowAttrs("class").Matching(regexp.MustCompile(`^(chroma )?language-[\w-]+( display)?( is-loading)?$`)).OnElements("code") // Checkboxes policy.AllowAttrs("type").Matching(regexp.MustCompile(`^checkbox$`)).OnElements("input") @@ -83,7 +83,7 @@ func createDefaultPolicy() *bluemonday.Policy { policy.AllowAttrs("class").Matching(regexp.MustCompile(`emoji`)).OnElements("img") // Allow icons, emojis, chroma syntax and keyword markup on span - policy.AllowAttrs("class").Matching(regexp.MustCompile(`^((icon(\s+[\p{L}\p{N}_-]+)+)|(emoji))$|^([a-z][a-z0-9]{0,2})$|^` + keywordClass + `$`)).OnElements("span") + policy.AllowAttrs("class").Matching(regexp.MustCompile(`^((icon(\s+[\p{L}\p{N}_-]+)+)|(emoji)|(language-math display)|(language-math inline))$|^([a-z][a-z0-9]{0,2})$|^` + keywordClass + `$`)).OnElements("span") // Allow 'style' attribute on text elements. policy.AllowAttrs("style").OnElements("span", "p") diff --git a/modules/setting/setting.go b/modules/setting/setting.go index 09e510ffa..1ac13cb5f 100644 --- a/modules/setting/setting.go +++ b/modules/setting/setting.go @@ -344,10 +344,12 @@ var ( EnableHardLineBreakInDocuments bool CustomURLSchemes []string `ini:"CUSTOM_URL_SCHEMES"` FileExtensions []string + EnableMath bool }{ EnableHardLineBreakInComments: true, EnableHardLineBreakInDocuments: false, FileExtensions: strings.Split(".md,.markdown,.mdown,.mkd", ","), + EnableMath: true, } // Admin settings diff --git a/package-lock.json b/package-lock.json index b3597a624..9e613422d 100644 --- a/package-lock.json +++ b/package-lock.json @@ -20,6 +20,7 @@ "font-awesome": "4.7.0", "jquery": "3.6.1", "jquery.are-you-sure": "1.9.0", + "katex": "0.16.2", "less": "4.1.3", "less-loader": "11.0.0", "license-checker-webpack-plugin": "0.2.1", @@ -7750,6 +7751,29 @@ "resolved": "https://registry.npmjs.org/just-extend/-/just-extend-5.1.1.tgz", "integrity": "sha512-b+z6yF1d4EOyDgylzQo5IminlUmzSeqR1hs/bzjBNjuGras4FXq/6TrzjxfN0j+TmI0ltJzTNlqXUMCniciwKQ==" }, + "node_modules/katex": { + "version": "0.16.2", + "resolved": "https://registry.npmjs.org/katex/-/katex-0.16.2.tgz", + "integrity": "sha512-70DJdQAyh9EMsthw3AaQlDyFf54X7nWEUIa5W+rq8XOpEk//w5Th7/8SqFqpvi/KZ2t6MHUj4f9wLmztBmAYQA==", + "funding": [ + "https://opencollective.com/katex", + "https://github.com/sponsors/katex" + ], + "dependencies": { + "commander": "^8.0.0" + }, + "bin": { + "katex": "cli.js" + } + }, + "node_modules/katex/node_modules/commander": { + "version": "8.3.0", + "resolved": "https://registry.npmjs.org/commander/-/commander-8.3.0.tgz", + "integrity": "sha512-OkTL9umf+He2DZkUq8f8J9of7yL6RJKI24dVITBmNfZBmri9zYZQrKkuXiKhyfPSu8tUhnVBB1iKXevvnlR4Ww==", + "engines": { + "node": ">= 12" + } + }, "node_modules/khroma": { "version": "2.0.0", "resolved": "https://registry.npmjs.org/khroma/-/khroma-2.0.0.tgz", @@ -17717,6 +17741,21 @@ "resolved": "https://registry.npmjs.org/just-extend/-/just-extend-5.1.1.tgz", "integrity": "sha512-b+z6yF1d4EOyDgylzQo5IminlUmzSeqR1hs/bzjBNjuGras4FXq/6TrzjxfN0j+TmI0ltJzTNlqXUMCniciwKQ==" }, + "katex": { + "version": "0.16.2", + "resolved": "https://registry.npmjs.org/katex/-/katex-0.16.2.tgz", + "integrity": "sha512-70DJdQAyh9EMsthw3AaQlDyFf54X7nWEUIa5W+rq8XOpEk//w5Th7/8SqFqpvi/KZ2t6MHUj4f9wLmztBmAYQA==", + "requires": { + "commander": "^8.0.0" + }, + "dependencies": { + "commander": { + "version": "8.3.0", + "resolved": "https://registry.npmjs.org/commander/-/commander-8.3.0.tgz", + "integrity": "sha512-OkTL9umf+He2DZkUq8f8J9of7yL6RJKI24dVITBmNfZBmri9zYZQrKkuXiKhyfPSu8tUhnVBB1iKXevvnlR4Ww==" + } + } + }, "khroma": { "version": "2.0.0", "resolved": "https://registry.npmjs.org/khroma/-/khroma-2.0.0.tgz", diff --git a/package.json b/package.json index e2eaec425..37571c01c 100644 --- a/package.json +++ b/package.json @@ -20,6 +20,7 @@ "font-awesome": "4.7.0", "jquery": "3.6.1", "jquery.are-you-sure": "1.9.0", + "katex": "0.16.2", "less": "4.1.3", "less-loader": "11.0.0", "license-checker-webpack-plugin": "0.2.1", diff --git a/web_src/js/markup/content.js b/web_src/js/markup/content.js index ef5067fd6..319c22938 100644 --- a/web_src/js/markup/content.js +++ b/web_src/js/markup/content.js @@ -1,10 +1,12 @@ import {renderMermaid} from './mermaid.js'; +import {renderMath} from './math.js'; import {renderCodeCopy} from './codecopy.js'; import {initMarkupTasklist} from './tasklist.js'; // code that runs for all markup content export function initMarkupContent() { renderMermaid(); + renderMath(); renderCodeCopy(); } diff --git a/web_src/js/markup/math.js b/web_src/js/markup/math.js new file mode 100644 index 000000000..5790a327a --- /dev/null +++ b/web_src/js/markup/math.js @@ -0,0 +1,37 @@ +function displayError(el, err) { + const target = targetElement(el); + target.remove('is-loading'); + const errorNode = document.createElement('div'); + errorNode.setAttribute('class', 'ui message error markup-block-error mono'); + errorNode.textContent = err.str || err.message || String(err); + target.before(errorNode); +} + +function targetElement(el) { + // The target element is either the current element if it has the `is-loading` class or the pre that contains it + return el.classList.contains('is-loading') ? el : el.closest('pre'); +} + +export async function renderMath() { + const els = document.querySelectorAll('.markup code.language-math'); + if (!els.length) return; + + const [{default: katex}] = await Promise.all([ + import(/* webpackChunkName: "katex" */'katex'), + import(/* webpackChunkName: "katex" */'katex/dist/katex.css'), + ]); + + for (const el of els) { + const source = el.textContent; + const options = {display: el.classList.contains('display')}; + + try { + const markup = katex.renderToString(source, options); + const tempEl = document.createElement(options.display ? 'p' : 'span'); + tempEl.innerHTML = markup; + targetElement(el).replaceWith(tempEl); + } catch (error) { + displayError(el, error); + } + } +} diff --git a/web_src/less/animations.less b/web_src/less/animations.less index 92a3052a1..ea31d53bf 100644 --- a/web_src/less/animations.less +++ b/web_src/less/animations.less @@ -33,6 +33,13 @@ height: var(--height-loading); } +code.language-math.is-loading::after { + padding: 0; + border-width: 2px; + width: 1.25rem; + height: 1.25rem; +} + @keyframes fadein { 0% { opacity: 0; diff --git a/webpack.config.js b/webpack.config.js index 39628df04..3cc65d19d 100644 --- a/webpack.config.js +++ b/webpack.config.js @@ -37,6 +37,10 @@ const filterCssImport = (url, ...args) => { if (/(eot|ttf|otf|woff|svg)$/.test(importedFile)) return false; } + if (cssFile.includes('katex') && /(ttf|woff)$/.test(importedFile)) { + return false; + } + if (cssFile.includes('font-awesome') && /(eot|ttf|otf|woff|svg)$/.test(importedFile)) { return false; }