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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 { DeclarationReference } from '@microsoft/tsdoc/lib-commonjs/beta/DeclarationReference';\nimport { ExcerptTokenKind, IExcerptToken, IExcerptTokenRange } from '@microsoft/api-extractor-model';\n\nimport { Span } from '../analyzer/Span';\nimport { DeclarationReferenceGenerator } from './DeclarationReferenceGenerator';\nimport { AstDeclaration } from '../analyzer/AstDeclaration';\n\n/**\n * Used to provide ExcerptBuilder with a list of nodes whose token range we want to capture.\n */\nexport interface IExcerptBuilderNodeToCapture {\n /**\n * The node to capture\n */\n node: ts.Node | undefined;\n /**\n * The token range whose startIndex/endIndex will be overwritten with the indexes for the\n * tokens corresponding to IExcerptBuilderNodeToCapture.node\n */\n tokenRange: IExcerptTokenRange;\n}\n\n/**\n * Internal state for ExcerptBuilder\n */\ninterface IBuildSpanState {\n referenceGenerator: DeclarationReferenceGenerator;\n\n /**\n * The AST node that we will traverse to extract tokens\n */\n startingNode: ts.Node;\n\n /**\n * Normally, the excerpt will include all child nodes for `startingNode`; whereas if `childKindToStopBefore`\n * is specified, then the node traversal will stop before (i.e. excluding) the first immediate child\n * of `startingNode` with the specified syntax kind.\n *\n * @remarks\n * For example, suppose the signature is `interface X: Y { z: string }`. The token `{` has syntax kind\n * `ts.SyntaxKind.FirstPunctuation`, so we can specify that to truncate the excerpt to `interface X: Y`.\n */\n stopBeforeChildKind: ts.SyntaxKind | undefined;\n\n tokenRangesByNode: Map<ts.Node, IExcerptTokenRange>;\n\n /**\n * Normally adjacent tokens of the same kind get merged, to avoid creating lots of unnecessary extra tokens.\n * However when an captured excerpt needs to start/end at a specific character, we temporarily disable merging by\n * setting this flag. After the new token is added, this flag is cleared.\n */\n disableMergingForNextToken: boolean;\n\n /**\n * Tracks whether the last appended token was a separator. If so, and we're in the middle of\n * capturing a token range, then omit the separator from the range.\n */\n lastAppendedTokenIsSeparator: boolean;\n}\n\nexport class ExcerptBuilder {\n /**\n * Appends a blank line to the `excerptTokens` list.\n * @param excerptTokens - The target token list to append to\n */\n public static addBlankLine(excerptTokens: IExcerptToken[]): void {\n let newlines: string = '\\n\\n';\n // If the existing text already ended with a newline, then only append one newline\n if (excerptTokens.length > 0) {\n const previousText: string = excerptTokens[excerptTokens.length - 1].text;\n if (/\\n$/.test(previousText)) {\n newlines = '\\n';\n }\n }\n excerptTokens.push({ kind: ExcerptTokenKind.Content, text: newlines });\n }\n\n /**\n * Appends the signature for the specified `AstDeclaration` to the `excerptTokens` list.\n * @param excerptTokens - The target token list to append to\n * @param nodesToCapture - A list of child nodes whose token ranges we want to capture\n */\n public static addDeclaration(\n excerptTokens: IExcerptToken[],\n astDeclaration: AstDeclaration,\n nodesToCapture: IExcerptBuilderNodeToCapture[],\n referenceGenerator: DeclarationReferenceGenerator\n ): void {\n let stopBeforeChildKind: ts.SyntaxKind | undefined = undefined;\n\n switch (astDeclaration.declaration.kind) {\n case ts.SyntaxKind.ClassDeclaration:\n case ts.SyntaxKind.EnumDeclaration:\n case ts.SyntaxKind.InterfaceDeclaration:\n // FirstPunctuation = \"{\"\n stopBeforeChildKind = ts.SyntaxKind.FirstPunctuation;\n break;\n case ts.SyntaxKind.ModuleDeclaration:\n // ModuleBlock = the \"{ ... }\" block\n stopBeforeChildKind = ts.SyntaxKind.ModuleBlock;\n break;\n }\n\n const span: Span = new Span(astDeclaration.declaration);\n\n const tokenRangesByNode: Map<ts.Node, IExcerptTokenRange> = new Map<ts.Node, IExcerptTokenRange>();\n for (const excerpt of nodesToCapture || []) {\n if (excerpt.node) {\n tokenRangesByNode.set(excerpt.node, excerpt.tokenRange);\n }\n }\n\n ExcerptBuilder._buildSpan(excerptTokens, span, {\n referenceGenerator: referenceGenerator,\n startingNode: span.node,\n stopBeforeChildKind,\n tokenRangesByNode,\n disableMergingForNextToken: false,\n lastAppendedTokenIsSeparator: false\n });\n }\n\n public static createEmptyTokenRange(): IExcerptTokenRange {\n return { startIndex: 0, endIndex: 0 };\n }\n\n private static _buildSpan(excerptTokens: IExcerptToken[], span: Span, state: IBuildSpanState): boolean {\n if (span.kind === ts.SyntaxKind.JSDocComment) {\n // Discard any comments\n return true;\n }\n\n // Can this node start a excerpt?\n const capturedTokenRange: IExcerptTokenRange | undefined = state.tokenRangesByNode.get(span.node);\n let excerptStartIndex: number = 0;\n\n if (capturedTokenRange) {\n // We will assign capturedTokenRange.startIndex to be the index of the next token to be appended\n excerptStartIndex = excerptTokens.length;\n state.disableMergingForNextToken = true;\n }\n\n if (span.prefix) {\n let canonicalReference: DeclarationReference | undefined = undefined;\n\n if (span.kind === ts.SyntaxKind.Identifier) {\n const name: ts.Identifier = span.node as ts.Identifier;\n if (!ExcerptBuilder._isDeclarationName(name)) {\n canonicalReference = state.referenceGenerator.getDeclarationReferenceForIdentifier(name);\n }\n }\n\n if (canonicalReference) {\n ExcerptBuilder._appendToken(\n excerptTokens,\n ExcerptTokenKind.Reference,\n span.prefix,\n state,\n canonicalReference\n );\n } else {\n ExcerptBuilder._appendToken(excerptTokens, ExcerptTokenKind.Content, span.prefix, state);\n }\n state.lastAppendedTokenIsSeparator = false;\n }\n\n for (const child of span.children) {\n if (span.node === state.startingNode) {\n if (state.stopBeforeChildKind && child.kind === state.stopBeforeChildKind) {\n // We reached a child whose kind is stopBeforeChildKind, so stop traversing\n return false;\n }\n }\n\n if (!this._buildSpan(excerptTokens, child, state)) {\n return false;\n }\n }\n\n if (span.suffix) {\n ExcerptBuilder._appendToken(excerptTokens, ExcerptTokenKind.Content, span.suffix, state);\n state.lastAppendedTokenIsSeparator = false;\n }\n if (span.separator) {\n ExcerptBuilder._appendToken(excerptTokens, ExcerptTokenKind.Content, span.separator, state);\n state.lastAppendedTokenIsSeparator = true;\n }\n\n // Are we building a excerpt? If so, set its range\n if (capturedTokenRange) {\n capturedTokenRange.startIndex = excerptStartIndex;\n\n // We will assign capturedTokenRange.startIndex to be the index after the last token\n // that was appended so far. However, if the last appended token was a separator and\n // there is no additional spaces, omit it from the range.\n let excerptEndIndex: number = excerptTokens.length;\n if (state.lastAppendedTokenIsSeparator && excerptEndIndex > excerptStartIndex + 1) {\n excerptEndIndex--;\n }\n\n capturedTokenRange.endIndex = excerptEndIndex;\n\n state.disableMergingForNextToken = true;\n }\n\n return true;\n }\n\n private static _appendToken(\n excerptTokens: IExcerptToken[],\n excerptTokenKind: ExcerptTokenKind,\n text: string,\n state: IBuildSpanState,\n canonicalReference?: DeclarationReference\n ): void {\n if (text.length === 0) {\n return;\n }\n\n if (excerptTokenKind !== ExcerptTokenKind.Content) {\n if (\n excerptTokenKind === ExcerptTokenKind.Reference &&\n excerptTokens.length > 1 &&\n !state.disableMergingForNextToken\n ) {\n // If the previous two tokens were a Reference and a '.', then concatenate\n // all three tokens as a qualified name Reference.\n const previousTokenM1: IExcerptToken = excerptTokens[excerptTokens.length - 1];\n const previousTokenM2: IExcerptToken = excerptTokens[excerptTokens.length - 2];\n if (\n previousTokenM1.kind === ExcerptTokenKind.Content &&\n previousTokenM1.text.trim() === '.' &&\n previousTokenM2.kind === ExcerptTokenKind.Reference\n ) {\n previousTokenM2.text += '.' + text;\n if (canonicalReference !== undefined) {\n previousTokenM2.canonicalReference = canonicalReference.toString();\n }\n excerptTokens.pop(); // remove previousTokenM1;\n return;\n }\n }\n } else {\n // If someone referenced this index, then we need to start a new token\n if (excerptTokens.length > 0 && !state.disableMergingForNextToken) {\n // Otherwise, can we merge with the previous token?\n const previousToken: IExcerptToken = excerptTokens[excerptTokens.length - 1];\n if (previousToken.kind === excerptTokenKind) {\n previousToken.text += text;\n return;\n }\n }\n }\n\n const excerptToken: IExcerptToken = { kind: excerptTokenKind, text: text };\n if (canonicalReference !== undefined) {\n excerptToken.canonicalReference = canonicalReference.toString();\n }\n excerptTokens.push(excerptToken);\n state.disableMergingForNextToken = false;\n }\n\n private static _isDeclarationName(name: ts.Identifier): boolean {\n return ExcerptBuilder._isDeclaration(name.parent) && name.parent.name === name;\n }\n\n private static _isDeclaration(node: ts.Node): node is ts.NamedDeclaration {\n switch (node.kind) {\n case ts.SyntaxKind.FunctionDeclaration:\n case ts.SyntaxKind.FunctionExpression:\n case ts.SyntaxKind.VariableDeclaration:\n case ts.SyntaxKind.Parameter:\n case ts.SyntaxKind.EnumDeclaration:\n case ts.SyntaxKind.ClassDeclaration:\n case ts.SyntaxKind.ClassExpression:\n case ts.SyntaxKind.ModuleDeclaration:\n case ts.SyntaxKind.MethodDeclaration:\n case ts.SyntaxKind.MethodSignature:\n case ts.SyntaxKind.PropertyDeclaration:\n case ts.SyntaxKind.PropertySignature:\n case ts.SyntaxKind.GetAccessor:\n case ts.SyntaxKind.SetAccessor:\n case ts.SyntaxKind.InterfaceDeclaration:\n case ts.SyntaxKind.TypeAliasDeclaration:\n case ts.SyntaxKind.TypeParameter:\n case ts.SyntaxKind.EnumMember:\n case ts.SyntaxKind.BindingElement:\n return true;\n default:\n return false;\n }\n }\n}\n"]} |