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1 line
7.4 KiB
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It splits DocParagraph nodes into multiple paragraphs by looking for\r\n * paragraph delimiters. Following CommonMark conventions, paragraphs are delimited by\r\n * one or more blank lines. (These lines end with SoftBreak nodes.) The blank lines are\r\n * not discarded. Instead, they are attached to the preceding paragraph. If the DocParagraph\r\n * starts with blank lines, they are preserved to avoid creating a paragraph containing only\r\n * whitespace.\r\n */\r\nexport class ParagraphSplitter {\r\n private static readonly _whitespaceRegExp: RegExp = /^\\s*$/;\r\n\r\n /**\r\n * Split all paragraphs belonging to the provided subtree.\r\n */\r\n public static splitParagraphs(node: DocNode): void {\r\n if (node instanceof DocSection) {\r\n ParagraphSplitter.splitParagraphsForSection(node);\r\n\r\n // (We don't recurse here, since sections cannot contain subsections)\r\n } else {\r\n for (const childNode of node.getChildNodes()) {\r\n ParagraphSplitter.splitParagraphs(childNode);\r\n }\r\n }\r\n }\r\n\r\n /**\r\n * Split all paragraphs belonging to the provided DocSection.\r\n */\r\n public static splitParagraphsForSection(docSection: DocSection): void {\r\n const inputNodes: ReadonlyArray<DocNode> = docSection.nodes;\r\n const outputNodes: DocNode[] = [];\r\n\r\n for (const oldNode of inputNodes) {\r\n if (oldNode.kind === DocNodeKind.Paragraph) {\r\n ParagraphSplitter._splitParagraph(oldNode as DocParagraph, outputNodes);\r\n } else {\r\n outputNodes.push(oldNode);\r\n }\r\n }\r\n\r\n // Replace the inputNodes with the outputNodes\r\n docSection.clearNodes();\r\n docSection.appendNodes(outputNodes);\r\n }\r\n\r\n private static _splitParagraph(oldParagraph: DocParagraph, outputNodes: DocNode[]): void {\r\n const inputParagraphNodes: ReadonlyArray<DocNode> = oldParagraph.nodes;\r\n\r\n let currentParagraph: DocParagraph = new DocParagraph({ configuration: oldParagraph.configuration });\r\n outputNodes.push(currentParagraph);\r\n\r\n const enum SplitterState {\r\n Start,\r\n AwaitingTrailer,\r\n ReadingTrailer\r\n }\r\n let state: SplitterState = SplitterState.Start;\r\n\r\n let currentIndex: number = 0;\r\n while (currentIndex < inputParagraphNodes.length) {\r\n // Scan forwards to the end of the line\r\n let isBlankLine: boolean = true;\r\n let lineEndIndex: number = currentIndex; // non-inclusive\r\n do {\r\n const node: DocNode = inputParagraphNodes[lineEndIndex++];\r\n if (node.kind === DocNodeKind.SoftBreak) {\r\n break;\r\n }\r\n if (isBlankLine) {\r\n if (!this._isWhitespace(node)) {\r\n isBlankLine = false;\r\n }\r\n }\r\n } while (lineEndIndex < inputParagraphNodes.length);\r\n\r\n // At this point, the line and SoftBreak will be in inputParagraphNodes.slice(currentIndex, lineEndIndex)\r\n\r\n switch (state) {\r\n case SplitterState.Start:\r\n // We're skipping any blank lines that start the first paragraph\r\n if (!isBlankLine) {\r\n state = SplitterState.AwaitingTrailer;\r\n }\r\n break;\r\n case SplitterState.AwaitingTrailer:\r\n // We already saw some content, so now we're looking for a blank line that starts the trailer\r\n // at the end of this paragraph\r\n if (isBlankLine) {\r\n state = SplitterState.ReadingTrailer;\r\n }\r\n break;\r\n case SplitterState.ReadingTrailer:\r\n // We already found the trailer, so now we're looking for a non-blank line that will\r\n // begin a new paragraph\r\n if (!isBlankLine) {\r\n // Start a new paragraph\r\n currentParagraph = new DocParagraph({ configuration: oldParagraph.configuration });\r\n outputNodes.push(currentParagraph);\r\n\r\n state = SplitterState.AwaitingTrailer;\r\n }\r\n break;\r\n }\r\n\r\n // Append the line onto the current paragraph\r\n for (let i: number = currentIndex; i < lineEndIndex; ++i) {\r\n currentParagraph.appendNode(inputParagraphNodes[i]);\r\n }\r\n\r\n currentIndex = lineEndIndex;\r\n }\r\n }\r\n\r\n private static _isWhitespace(node: DocNode): boolean {\r\n switch (node.kind) {\r\n case DocNodeKind.PlainText:\r\n const docPlainText: DocPlainText = node as DocPlainText;\r\n return ParagraphSplitter._whitespaceRegExp.test(docPlainText.text);\r\n default:\r\n return false;\r\n }\r\n }\r\n}\r\n"]} |