1 line
34 KiB
Plaintext
1 line
34 KiB
Plaintext
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Copyright (c) Microsoft Corporation. All rights reserved. Licensed under the MIT license.\n// See LICENSE in the project root for license information.\n\nimport * as ts from 'typescript';\nimport { InternalError, Sort } from '@rushstack/node-core-library';\n\nimport { IndentedWriter } from '../generators/IndentedWriter';\n\ninterface IWriteModifiedTextOptions {\n writer: IndentedWriter;\n separatorOverride: string | undefined;\n indentDocCommentState: IndentDocCommentState;\n}\n\nenum IndentDocCommentState {\n /**\n * `indentDocComment` was not requested for this subtree.\n */\n Inactive = 0,\n /**\n * `indentDocComment` was requested and we are looking for the opening `/` `*`\n */\n AwaitingOpenDelimiter = 1,\n /**\n * `indentDocComment` was requested and we are looking for the closing `*` `/`\n */\n AwaitingCloseDelimiter = 2,\n /**\n * `indentDocComment` was requested and we have finished indenting the comment.\n */\n Done = 3\n}\n\n/**\n * Choices for SpanModification.indentDocComment.\n */\nexport enum IndentDocCommentScope {\n /**\n * Do not detect and indent comments.\n */\n None = 0,\n\n /**\n * Look for one doc comment in the {@link Span.prefix} text only.\n */\n PrefixOnly = 1,\n\n /**\n * Look for one doc comment potentially distributed across the Span and its children.\n */\n SpanAndChildren = 2\n}\n\n/**\n * Specifies various transformations that will be performed by Span.getModifiedText().\n */\nexport class SpanModification {\n /**\n * If true, all of the child spans will be omitted from the Span.getModifiedText() output.\n * @remarks\n * Also, the modify() operation will not recurse into these spans.\n */\n public omitChildren: boolean = false;\n\n /**\n * If true, then the Span.separator will be removed from the Span.getModifiedText() output.\n */\n public omitSeparatorAfter: boolean = false;\n\n /**\n * If true, then Span.getModifiedText() will sort the immediate children according to their Span.sortKey\n * property. The separators will also be fixed up to ensure correct indentation. If the Span.sortKey is undefined\n * for some items, those items will not be moved, i.e. their array indexes will be unchanged.\n */\n public sortChildren: boolean = false;\n\n /**\n * Used if the parent span has Span.sortChildren=true.\n */\n public sortKey: string | undefined;\n\n /**\n * Optionally configures getModifiedText() to search for a \"/*\" doc comment and indent it.\n * At most one comment is detected.\n *\n * @remarks\n * The indentation can be applied to the `Span.modifier.prefix` only, or it can be applied to the\n * full subtree of nodes (as needed for `ts.SyntaxKind.JSDocComment` trees). However the enabled\n * scopes must not overlap.\n *\n * This feature is enabled selectively because (1) we do not want to accidentally match `/*` appearing\n * in a string literal or other expression that is not a comment, and (2) parsing comments is relatively\n * expensive.\n */\n public indentDocComment: IndentDocCommentScope = IndentDocCommentScope.None;\n\n private readonly _span: Span;\n private _prefix: string | undefined;\n private _suffix: string | undefined;\n\n public constructor(span: Span) {\n this._span = span;\n this.reset();\n }\n\n /**\n * Allows the Span.prefix text to be changed.\n */\n public get prefix(): string {\n return this._prefix !== undefined ? this._prefix : this._span.prefix;\n }\n\n public set prefix(value: string) {\n this._prefix = value;\n }\n\n /**\n * Allows the Span.suffix text to be changed.\n */\n public get suffix(): string {\n return this._suffix !== undefined ? this._suffix : this._span.suffix;\n }\n\n public set suffix(value: string) {\n this._suffix = value;\n }\n\n /**\n * Reverts any modifications made to this object.\n */\n public reset(): void {\n this.omitChildren = false;\n this.omitSeparatorAfter = false;\n this.sortChildren = false;\n this.sortKey = undefined;\n this._prefix = undefined;\n this._suffix = undefined;\n if (this._span.kind === ts.SyntaxKind.JSDocComment) {\n this.indentDocComment = IndentDocCommentScope.SpanAndChildren;\n }\n }\n\n /**\n * Effectively deletes the Span from the tree, by skipping its children, skipping its separator,\n * and setting its prefix/suffix to the empty string.\n */\n public skipAll(): void {\n this.prefix = '';\n this.suffix = '';\n this.omitChildren = true;\n this.omitSeparatorAfter = true;\n }\n}\n\n/**\n * The Span class provides a simple way to rewrite TypeScript source files\n * based on simple syntax transformations, i.e. without having to process deeper aspects\n * of the underlying grammar. An example transformation might be deleting JSDoc comments\n * from a source file.\n *\n * @remarks\n * TypeScript's abstract syntax tree (AST) is represented using Node objects.\n * The Node text ignores its surrounding whitespace, and does not have an ordering guarantee.\n * For example, a JSDocComment node can be a child of a FunctionDeclaration node, even though\n * the actual comment precedes the function in the input stream.\n *\n * The Span class is a wrapper for a single Node, that provides access to every character\n * in the input stream, such that Span.getText() will exactly reproduce the corresponding\n * full Node.getText() output.\n *\n * A Span is comprised of these parts, which appear in sequential order:\n * - A prefix\n * - A collection of child spans\n * - A suffix\n * - A separator (e.g. whitespace between this span and the next item in the tree)\n *\n * These parts can be modified via Span.modification. The modification is applied by\n * calling Span.getModifiedText().\n */\nexport class Span {\n public readonly node: ts.Node;\n\n // To improve performance, substrings are not allocated until actually needed\n public readonly startIndex: number;\n public readonly endIndex: number;\n\n public readonly children: Span[];\n\n public readonly modification: SpanModification;\n\n private _parent: Span | undefined;\n private _previousSibling: Span | undefined;\n private _nextSibling: Span | undefined;\n\n private _separatorStartIndex: number;\n private _separatorEndIndex: number;\n\n public constructor(node: ts.Node) {\n this.node = node;\n this.startIndex = node.kind === ts.SyntaxKind.SourceFile ? node.getFullStart() : node.getStart();\n this.endIndex = node.end;\n this._separatorStartIndex = 0;\n this._separatorEndIndex = 0;\n this.children = [];\n this.modification = new SpanModification(this);\n\n let previousChildSpan: Span | undefined = undefined;\n\n for (const childNode of this.node.getChildren() || []) {\n const childSpan: Span = new Span(childNode);\n childSpan._parent = this;\n childSpan._previousSibling = previousChildSpan;\n\n if (previousChildSpan) {\n previousChildSpan._nextSibling = childSpan;\n }\n\n this.children.push(childSpan);\n\n // Normalize the bounds so that a child is never outside its parent\n if (childSpan.startIndex < this.startIndex) {\n this.startIndex = childSpan.startIndex;\n }\n\n if (childSpan.endIndex > this.endIndex) {\n // This has never been observed empirically, but here's how we would handle it\n this.endIndex = childSpan.endIndex;\n throw new InternalError('Unexpected AST case');\n }\n\n if (previousChildSpan) {\n if (previousChildSpan.endIndex < childSpan.startIndex) {\n // There is some leftover text after previous child -- assign it as the separator for\n // the preceding span. If the preceding span has no suffix, then assign it to the\n // deepest preceding span with no suffix. This heuristic simplifies the most\n // common transformations, and otherwise it can be fished out using getLastInnerSeparator().\n let separatorRecipient: Span = previousChildSpan;\n while (separatorRecipient.children.length > 0) {\n const lastChild: Span = separatorRecipient.children[separatorRecipient.children.length - 1];\n if (lastChild.endIndex !== separatorRecipient.endIndex) {\n // There is a suffix, so we cannot push the separator any further down, or else\n // it would get printed before this suffix.\n break;\n }\n separatorRecipient = lastChild;\n }\n separatorRecipient._separatorStartIndex = previousChildSpan.endIndex;\n separatorRecipient._separatorEndIndex = childSpan.startIndex;\n }\n }\n\n previousChildSpan = childSpan;\n }\n }\n\n public get kind(): ts.SyntaxKind {\n return this.node.kind;\n }\n\n /**\n * The parent Span, if any.\n * NOTE: This will be undefined for a root Span, even though the corresponding Node\n * may have a parent in the AST.\n */\n public get parent(): Span | undefined {\n return this._parent;\n }\n\n /**\n * If the current object is this.parent.children[i], then previousSibling corresponds\n * to this.parent.children[i-1] if it exists.\n * NOTE: This will be undefined for a root Span, even though the corresponding Node\n * may have a previous sibling in the AST.\n */\n public get previousSibling(): Span | undefined {\n return this._previousSibling;\n }\n\n /**\n * If the current object is this.parent.children[i], then previousSibling corresponds\n * to this.parent.children[i+1] if it exists.\n * NOTE: This will be undefined for a root Span, even though the corresponding Node\n * may have a previous sibling in the AST.\n */\n public get nextSibling(): Span | undefined {\n return this._nextSibling;\n }\n\n /**\n * The text associated with the underlying Node, up to its first child.\n */\n public get prefix(): string {\n if (this.children.length) {\n // Everything up to the first child\n return this._getSubstring(this.startIndex, this.children[0].startIndex);\n } else {\n return this._getSubstring(this.startIndex, this.endIndex);\n }\n }\n\n /**\n * The text associated with the underlying Node, after its last child.\n * If there are no children, this is always an empty string.\n */\n public get suffix(): string {\n if (this.children.length) {\n // Everything after the last child\n return this._getSubstring(this.children[this.children.length - 1].endIndex, this.endIndex);\n } else {\n return '';\n }\n }\n\n /**\n * Whitespace that appeared after this node, and before the \"next\" node in the tree.\n * Here we mean \"next\" according to an inorder traversal, not necessarily a sibling.\n */\n public get separator(): string {\n return this._getSubstring(this._separatorStartIndex, this._separatorEndIndex);\n }\n\n /**\n * Returns the separator of this Span, or else recursively calls getLastInnerSeparator()\n * on the last child.\n */\n public getLastInnerSeparator(): string {\n if (this.separator) {\n return this.separator;\n }\n if (this.children.length > 0) {\n return this.children[this.children.length - 1].getLastInnerSeparator();\n }\n return '';\n }\n\n /**\n * Returns the first parent node with the specified SyntaxKind, or undefined if there is no match.\n */\n public findFirstParent(kindToMatch: ts.SyntaxKind): Span | undefined {\n let current: Span | undefined = this;\n\n while (current) {\n if (current.kind === kindToMatch) {\n return current;\n }\n current = current.parent;\n }\n\n return undefined;\n }\n\n /**\n * Recursively invokes the callback on this Span and all its children. The callback\n * can make changes to Span.modification for each node.\n */\n public forEach(callback: (span: Span) => void): void {\n callback(this);\n for (const child of this.children) {\n child.forEach(callback);\n }\n }\n\n /**\n * Returns the original unmodified text represented by this Span.\n */\n public getText(): string {\n let result: string = '';\n result += this.prefix;\n\n for (const child of this.children) {\n result += child.getText();\n }\n\n result += this.suffix;\n result += this.separator;\n\n return result;\n }\n\n /**\n * Returns the text represented by this Span, after applying all requested modifications.\n */\n public getModifiedText(): string {\n const writer: IndentedWriter = new IndentedWriter();\n writer.trimLeadingSpaces = true;\n\n this._writeModifiedText({\n writer: writer,\n separatorOverride: undefined,\n indentDocCommentState: IndentDocCommentState.Inactive\n });\n\n return writer.getText();\n }\n\n public writeModifiedText(output: IndentedWriter): void {\n this._writeModifiedText({\n writer: output,\n separatorOverride: undefined,\n indentDocCommentState: IndentDocCommentState.Inactive\n });\n }\n\n /**\n * Returns a diagnostic dump of the tree, showing the prefix/suffix/separator for\n * each node.\n */\n public getDump(indent: string = ''): string {\n let result: string = indent + ts.SyntaxKind[this.node.kind] + ': ';\n\n if (this.prefix) {\n result += ' pre=[' + this._getTrimmed(this.prefix) + ']';\n }\n if (this.suffix) {\n result += ' suf=[' + this._getTrimmed(this.suffix) + ']';\n }\n if (this.separator) {\n result += ' sep=[' + this._getTrimmed(this.separator) + ']';\n }\n result += '\\n';\n\n for (const child of this.children) {\n result += child.getDump(indent + ' ');\n }\n\n return result;\n }\n\n /**\n * Returns a diagnostic dump of the tree, showing the SpanModification settings for each nodde.\n */\n public getModifiedDump(indent: string = ''): string {\n let result: string = indent + ts.SyntaxKind[this.node.kind] + ': ';\n\n if (this.prefix) {\n result += ' pre=[' + this._getTrimmed(this.modification.prefix) + ']';\n }\n if (this.suffix) {\n result += ' suf=[' + this._getTrimmed(this.modification.suffix) + ']';\n }\n if (this.separator) {\n result += ' sep=[' + this._getTrimmed(this.separator) + ']';\n }\n if (this.modification.indentDocComment !== IndentDocCommentScope.None) {\n result += ' indentDocComment=' + IndentDocCommentScope[this.modification.indentDocComment];\n }\n if (this.modification.omitChildren) {\n result += ' omitChildren';\n }\n if (this.modification.omitSeparatorAfter) {\n result += ' omitSeparatorAfter';\n }\n if (this.modification.sortChildren) {\n result += ' sortChildren';\n }\n if (this.modification.sortKey !== undefined) {\n result += ` sortKey=\"${this.modification.sortKey}\"`;\n }\n result += '\\n';\n\n if (!this.modification.omitChildren) {\n for (const child of this.children) {\n result += child.getModifiedDump(indent + ' ');\n }\n } else {\n result += `${indent} (${this.children.length} children)\\n`;\n }\n\n return result;\n }\n\n /**\n * Recursive implementation of `getModifiedText()` and `writeModifiedText()`.\n */\n private _writeModifiedText(options: IWriteModifiedTextOptions): void {\n // Apply indentation based on \"{\" and \"}\"\n if (this.prefix === '{') {\n options.writer.increaseIndent();\n } else if (this.prefix === '}') {\n options.writer.decreaseIndent();\n }\n\n if (this.modification.indentDocComment !== IndentDocCommentScope.None) {\n this._beginIndentDocComment(options);\n }\n\n this._write(this.modification.prefix, options);\n\n if (this.modification.indentDocComment === IndentDocCommentScope.PrefixOnly) {\n this._endIndentDocComment(options);\n }\n\n let sortedSubset: Span[] | undefined;\n\n if (!this.modification.omitChildren) {\n if (this.modification.sortChildren) {\n // We will only sort the items with a sortKey\n const filtered: Span[] = this.children.filter((x) => x.modification.sortKey !== undefined);\n\n // Is there at least one of them?\n if (filtered.length > 1) {\n sortedSubset = filtered;\n }\n }\n }\n\n if (sortedSubset) {\n // This is the complicated special case that sorts an arbitrary subset of the child nodes,\n // preserving the surrounding nodes.\n\n const sortedSubsetCount: number = sortedSubset.length;\n // Remember the separator for the first and last ones\n const firstSeparator: string = sortedSubset[0].getLastInnerSeparator();\n const lastSeparator: string = sortedSubset[sortedSubsetCount - 1].getLastInnerSeparator();\n\n Sort.sortBy(sortedSubset, (x) => x.modification.sortKey);\n\n const childOptions: IWriteModifiedTextOptions = { ...options };\n\n let sortedSubsetIndex: number = 0;\n for (let index: number = 0; index < this.children.length; ++index) {\n let current: Span;\n\n // Is this an item that we sorted?\n if (this.children[index].modification.sortKey === undefined) {\n // No, take the next item from the original array\n current = this.children[index];\n childOptions.separatorOverride = undefined;\n } else {\n // Yes, take the next item from the sortedSubset\n current = sortedSubset[sortedSubsetIndex++];\n\n if (sortedSubsetIndex < sortedSubsetCount) {\n childOptions.separatorOverride = firstSeparator;\n } else {\n childOptions.separatorOverride = lastSeparator;\n }\n }\n\n current._writeModifiedText(childOptions);\n }\n } else {\n // This is the normal case that does not need to sort children\n const childrenLength: number = this.children.length;\n\n if (!this.modification.omitChildren) {\n if (options.separatorOverride !== undefined) {\n // Special case where the separatorOverride is passed down to the \"last inner separator\" span\n for (let i: number = 0; i < childrenLength; ++i) {\n const child: Span = this.children[i];\n\n if (\n // Only the last child inherits the separatorOverride, because only it can contain\n // the \"last inner separator\" span\n i < childrenLength - 1 ||\n // If this.separator is specified, then we will write separatorOverride below, so don't pass it along\n this.separator\n ) {\n const childOptions: IWriteModifiedTextOptions = { ...options };\n childOptions.separatorOverride = undefined;\n child._writeModifiedText(childOptions);\n } else {\n child._writeModifiedText(options);\n }\n }\n } else {\n // The normal simple case\n for (const child of this.children) {\n child._writeModifiedText(options);\n }\n }\n }\n\n this._write(this.modification.suffix, options);\n\n if (options.separatorOverride !== undefined) {\n if (this.separator || childrenLength === 0) {\n this._write(options.separatorOverride, options);\n }\n } else {\n if (!this.modification.omitSeparatorAfter) {\n this._write(this.separator, options);\n }\n }\n }\n\n if (this.modification.indentDocComment === IndentDocCommentScope.SpanAndChildren) {\n this._endIndentDocComment(options);\n }\n }\n\n private _beginIndentDocComment(options: IWriteModifiedTextOptions): void {\n if (options.indentDocCommentState !== IndentDocCommentState.Inactive) {\n throw new InternalError('indentDocComment cannot be nested');\n }\n options.indentDocCommentState = IndentDocCommentState.AwaitingOpenDelimiter;\n }\n\n private _endIndentDocComment(options: IWriteModifiedTextOptions): void {\n if (options.indentDocCommentState === IndentDocCommentState.AwaitingCloseDelimiter) {\n throw new InternalError('missing \"*/\" delimiter for comment block');\n }\n options.indentDocCommentState = IndentDocCommentState.Inactive;\n }\n\n /**\n * Writes one chunk of `text` to the `options.writer`, applying the `indentDocComment` rewriting.\n */\n private _write(text: string, options: IWriteModifiedTextOptions): void {\n let parsedText: string = text;\n\n if (options.indentDocCommentState === IndentDocCommentState.AwaitingOpenDelimiter) {\n let index: number = parsedText.indexOf('/*');\n if (index >= 0) {\n index += '/*'.length;\n options.writer.write(parsedText.substring(0, index));\n parsedText = parsedText.substring(index);\n options.indentDocCommentState = IndentDocCommentState.AwaitingCloseDelimiter;\n\n options.writer.increaseIndent(' ');\n }\n }\n\n if (options.indentDocCommentState === IndentDocCommentState.AwaitingCloseDelimiter) {\n let index: number = parsedText.indexOf('*/');\n if (index >= 0) {\n index += '*/'.length;\n options.writer.write(parsedText.substring(0, index));\n parsedText = parsedText.substring(index);\n options.indentDocCommentState = IndentDocCommentState.Done;\n\n options.writer.decreaseIndent();\n }\n }\n\n options.writer.write(parsedText);\n }\n\n private _getTrimmed(text: string): string {\n const trimmed: string = text.replace(/\\r?\\n/g, '\\\\n');\n\n if (trimmed.length > 100) {\n return trimmed.substr(0, 97) + '...';\n }\n return trimmed;\n }\n\n private _getSubstring(startIndex: number, endIndex: number): string {\n if (startIndex === endIndex) {\n return '';\n }\n return this.node.getSourceFile().text.substring(startIndex, endIndex);\n }\n}\n"]} |