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add support for Markdown in comments
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src/main/kotlin/org/move/ide/docs/MvRenderedDocumentationPipeline.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,193 @@ | ||
| package org.move.ide.docs | ||
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| import com.intellij.codeEditor.printing.HTMLTextPainter | ||
| import com.intellij.openapi.editor.colors.EditorColorsManager | ||
| import com.intellij.openapi.editor.colors.EditorColorsScheme | ||
| import com.intellij.psi.PsiElement | ||
| import com.intellij.ui.ColorHexUtil | ||
| import com.intellij.ui.ColorUtil | ||
| import org.intellij.markdown.IElementType | ||
| import org.intellij.markdown.MarkdownElementTypes | ||
| import org.intellij.markdown.MarkdownTokenTypes | ||
| import org.intellij.markdown.ast.ASTNode | ||
| import org.intellij.markdown.ast.getTextInNode | ||
| import org.intellij.markdown.flavours.MarkdownFlavourDescriptor | ||
| import org.intellij.markdown.flavours.gfm.GFMFlavourDescriptor | ||
| import org.intellij.markdown.html.* | ||
| import org.intellij.markdown.parser.LinkMap | ||
| import org.intellij.markdown.parser.MarkdownParser | ||
| import java.net.URI | ||
|
|
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| enum class MvDocRenderMode { | ||
| /** | ||
| * Hover Documentation mode. | ||
| */ | ||
| QUICK_DOC_POPUP, | ||
|
|
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| /** | ||
| * Inline Editor Documentation mode. | ||
| * | ||
| * Such documentation is displayed directly in the editor. | ||
| */ | ||
| INLINE_DOC_COMMENT, | ||
| } | ||
|
|
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| fun documentationAsHtml(text: String, context: PsiElement): String { | ||
| val documentationText = processDocumentationText(text) | ||
| val flavour = MvDocMarkdownFlavourDescriptor(context, null, MvDocRenderMode.QUICK_DOC_POPUP) | ||
| val root = MarkdownParser(flavour).buildMarkdownTreeFromString(documentationText) | ||
| return HtmlGenerator(documentationText, root, flavour).generateHtml() | ||
| } | ||
|
|
||
| /** | ||
| * Prepares passed a comment text for the Markdown parser. | ||
| * | ||
| * For example, a line with a dot at the end will be split by "\n\n" to separate two paragraphs, | ||
| * without this, [HtmlGenerator] will render it as one paragraph for this and the next lines. | ||
| */ | ||
| fun processDocumentationText(text: String): String { | ||
| // Comments spanning multiple lines are merged using spaces, unless | ||
| // | ||
| // - the line is empty | ||
| // - the line ends with a . (end of sentence) | ||
| // - the line is purely of at least 3 of -, =, _, *, ~ (horizontal rule) | ||
| // - the line starts with at least one # followed by a space (header) | ||
| // - the line starts and ends with a | (table) | ||
| // - the line starts with - (list) | ||
|
|
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| var insideCodeBlock = false | ||
| val lines = text.lines() | ||
| val newLines = lines.map { l -> | ||
| // don't trim extra spaces in code blocks | ||
| val line = if (insideCodeBlock) l.trimStart('/').removePrefix(" ") else l.trimStart('/', ' ') | ||
| if (line.startsWith("```")) { | ||
| insideCodeBlock = !insideCodeBlock | ||
| } else if (insideCodeBlock) { | ||
| // don't add any extra new lines to code blocks | ||
| return@map line | ||
| } | ||
|
|
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| if (ORDERED_LIST_REGEX.matches(line)) { | ||
| line // don't add any extra new lines to lists | ||
| } else if (line.endsWith(".") || line.endsWith("!") || line.endsWith("?") || | ||
| line.matches(Regex("^[-=_*~]{3,}\$")) || | ||
| line.endsWith("|") || | ||
| line.startsWith("|") || | ||
| line.startsWith("-") | ||
| ) { | ||
| line + "\n\n" | ||
| } else { | ||
| line | ||
| } | ||
| } | ||
|
|
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| return newLines.joinToString("\n") | ||
| } | ||
|
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| val ORDERED_LIST_REGEX = """^(\d+\.|-|\*)\s.*$""".toRegex() | ||
|
|
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| /** | ||
| * Defines how to render Markdown into HTML. | ||
| */ | ||
| private class MvDocMarkdownFlavourDescriptor( | ||
| private val context: PsiElement, | ||
| private val uri: URI? = null, | ||
| private val renderMode: MvDocRenderMode, | ||
| private val gfm: MarkdownFlavourDescriptor = GFMFlavourDescriptor(useSafeLinks = false, absolutizeAnchorLinks = true), | ||
| ) : MarkdownFlavourDescriptor by gfm { | ||
|
|
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| override fun createHtmlGeneratingProviders(linkMap: LinkMap, baseURI: URI?): Map<IElementType, GeneratingProvider> { | ||
| val generatingProviders = HashMap(gfm.createHtmlGeneratingProviders(linkMap, uri ?: baseURI)) | ||
| // Filter out MARKDOWN_FILE to avoid producing unnecessary <body> tags | ||
| generatingProviders.remove(MarkdownElementTypes.MARKDOWN_FILE) | ||
| // Use smaller header providers as h1 and h2 are too large | ||
| generatingProviders[MarkdownElementTypes.ATX_1] = SimpleTagProvider("h2") | ||
| generatingProviders[MarkdownElementTypes.ATX_2] = SimpleTagProvider("h3") | ||
| generatingProviders[MarkdownElementTypes.CODE_FENCE] = MvCodeFenceProvider(context, renderMode) | ||
|
|
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| return generatingProviders | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Defines how to render multiline code blocks. | ||
| */ | ||
| private class MvCodeFenceProvider( | ||
| private val context: PsiElement, | ||
| private val renderMode: MvDocRenderMode, | ||
| ) : GeneratingProvider { | ||
|
|
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| override fun processNode(visitor: HtmlGenerator.HtmlGeneratingVisitor, text: String, node: ASTNode) { | ||
| val indentBefore = node.getTextInNode(text).commonPrefixWith(" ".repeat(10)).length | ||
|
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| val codeText = StringBuilder() | ||
|
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| var childrenToConsider = node.children | ||
| if (childrenToConsider.last().type == MarkdownTokenTypes.CODE_FENCE_END) { | ||
| childrenToConsider = childrenToConsider.subList(0, childrenToConsider.size - 1) | ||
| } | ||
|
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| var isContentStarted = false | ||
|
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| for (child in childrenToConsider) { | ||
| if (isContentStarted && child.type in listOf(MarkdownTokenTypes.CODE_FENCE_CONTENT, MarkdownTokenTypes.EOL)) { | ||
| val rawLine = HtmlGenerator.trimIndents(child.getTextInNode(text), indentBefore) | ||
| codeText.append(rawLine) | ||
| } | ||
|
|
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| if (!isContentStarted && child.type == MarkdownTokenTypes.EOL) { | ||
| isContentStarted = true | ||
| } | ||
| } | ||
|
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| visitor.consumeHtml(convertToHtmlWithHighlighting(codeText.toString())) | ||
| } | ||
|
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| private fun convertToHtmlWithHighlighting(codeText: String): String { | ||
| var htmlCodeText = HTMLTextPainter.convertCodeFragmentToHTMLFragmentWithInlineStyles(context, codeText) | ||
|
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| val scheme = EditorColorsManager.getInstance().globalScheme | ||
|
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| // replace <pre> with <pre> with nicer looking styles in the rendered view | ||
| htmlCodeText = htmlCodeText.replaceFirst( | ||
| "<pre>", | ||
| "<pre style=\"text-indent: ${CODE_SNIPPET_INDENT}px; margin-bottom: -20px;\">" | ||
| ) | ||
|
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| return when (renderMode) { | ||
| MvDocRenderMode.INLINE_DOC_COMMENT -> htmlCodeText.dimColors(scheme) | ||
| else -> htmlCodeText | ||
| } | ||
| } | ||
|
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| /** | ||
| * Makes the colors muted to show it in the comment that is rendered directly in the code. | ||
| * This function is mostly for minor visual improvements. | ||
| * | ||
| * TODO: this code is not used yet, but we will need it for the next steps | ||
| */ | ||
| private fun String.dimColors(scheme: EditorColorsScheme): String { | ||
| val alpha = if (isColorSchemeDark(scheme)) DARK_THEME_ALPHA else LIGHT_THEME_ALPHA | ||
|
|
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| return replace(COLOR_PATTERN) { result -> | ||
| val colorHexValue = result.groupValues[1] | ||
| val fgColor = ColorHexUtil.fromHexOrNull(colorHexValue) ?: return@replace result.value | ||
| val bgColor = scheme.defaultBackground | ||
| val finalColor = ColorUtil.mix(bgColor, fgColor, alpha) | ||
|
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| "color: #${ColorUtil.toHex(finalColor)}" | ||
| } | ||
| } | ||
|
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| private fun isColorSchemeDark(scheme: EditorColorsScheme): Boolean { | ||
| return ColorUtil.isDark(scheme.defaultBackground) | ||
| } | ||
|
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| companion object { | ||
| private val COLOR_PATTERN = """color:\s*#(\p{XDigit}{3,})""".toRegex() | ||
|
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| private const val CODE_SNIPPET_INDENT = 10 | ||
| private const val LIGHT_THEME_ALPHA = 0.6 | ||
| private const val DARK_THEME_ALPHA = 0.78 | ||
| } | ||
| } |
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