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@cucumber/gherkin

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import AstNode from './AstNode.js'; import { AstBuilderException } from './Errors.js'; import { RuleType, TokenType } from './Parser.js'; export default class AstBuilder { stack; comments; newId; constructor(newId) { this.newId = newId; if (!newId) { throw new Error('No newId'); } this.reset(); } reset() { this.stack = [new AstNode(RuleType.None)]; this.comments = []; } startRule(ruleType) { this.stack.push(new AstNode(ruleType)); } endRule() { const node = this.stack.pop(); const transformedNode = this.transformNode(node); this.currentNode().add(node.ruleType, transformedNode); } build(token) { if (token.matchedType === TokenType.Comment) { this.comments.push({ location: this.getLocation(token), text: token.matchedText, }); } else { this.currentNode().add(token.matchedType, token); } } getResult() { return this.currentNode().getSingle(RuleType.GherkinDocument); } currentNode() { return this.stack[this.stack.length - 1]; } getLocation(token, column) { return !column ? token.location : { line: token.location.line, column }; } getTags(node) { const tags = []; const tagsNode = node.getSingle(RuleType.Tags); if (!tagsNode) { return tags; } const tokens = tagsNode.getTokens(TokenType.TagLine); for (const token of tokens) { for (const tagItem of token.matchedItems) { tags.push({ location: this.getLocation(token, tagItem.column), name: tagItem.text, id: this.newId(), }); } } return tags; } getCells(tableRowToken) { return tableRowToken.matchedItems.map((cellItem) => ({ location: this.getLocation(tableRowToken, cellItem.column), value: cellItem.text, })); } getDescription(node) { return node.getSingle(RuleType.Description) || ''; } getSteps(node) { return node.getItems(RuleType.Step); } getTableRows(node) { const rows = node.getTokens(TokenType.TableRow).map((token) => ({ id: this.newId(), location: this.getLocation(token), cells: this.getCells(token), })); this.ensureCellCount(rows); return rows.length === 0 ? [] : rows; } ensureCellCount(rows) { if (rows.length === 0) { return; } const cellCount = rows[0].cells.length; rows.forEach((row) => { if (row.cells.length !== cellCount) { throw AstBuilderException.create('inconsistent cell count within the table', row.location); } }); } transformNode(node) { switch (node.ruleType) { case RuleType.Step: { const stepLine = node.getToken(TokenType.StepLine); const dataTable = node.getSingle(RuleType.DataTable); const docString = node.getSingle(RuleType.DocString); const location = this.getLocation(stepLine); const step = { id: this.newId(), location, keyword: stepLine.matchedKeyword, keywordType: stepLine.matchedKeywordType, text: stepLine.matchedText, dataTable: dataTable, docString: docString, }; return step; } case RuleType.DocString: { const separatorToken = node.getTokens(TokenType.DocStringSeparator)[0]; const mediaType = separatorToken.matchedText.length > 0 ? separatorToken.matchedText : undefined; const lineTokens = node.getTokens(TokenType.Other); const content = lineTokens.map((t) => t.matchedText).join('\n'); const result = { location: this.getLocation(separatorToken), content, delimiter: separatorToken.matchedKeyword, }; // conditionally add this like this (needed to make tests pass on node 0.10 as well as 4.0) if (mediaType) { result.mediaType = mediaType; } return result; } case RuleType.DataTable: { const rows = this.getTableRows(node); const dataTable = { location: rows[0].location, rows, }; return dataTable; } case RuleType.Background: { const backgroundLine = node.getToken(TokenType.BackgroundLine); const description = this.getDescription(node); const steps = this.getSteps(node); const background = { id: this.newId(), location: this.getLocation(backgroundLine), keyword: backgroundLine.matchedKeyword, name: backgroundLine.matchedText, description, steps, }; return background; } case RuleType.ScenarioDefinition: { const tags = this.getTags(node); const scenarioNode = node.getSingle(RuleType.Scenario); const scenarioLine = scenarioNode.getToken(TokenType.ScenarioLine); const description = this.getDescription(scenarioNode); const steps = this.getSteps(scenarioNode); const examples = scenarioNode.getItems(RuleType.ExamplesDefinition); const scenario = { id: this.newId(), tags, location: this.getLocation(scenarioLine), keyword: scenarioLine.matchedKeyword, name: scenarioLine.matchedText, description, steps, examples, }; return scenario; } case RuleType.ExamplesDefinition: { const tags = this.getTags(node); const examplesNode = node.getSingle(RuleType.Examples); const examplesLine = examplesNode.getToken(TokenType.ExamplesLine); const description = this.getDescription(examplesNode); const examplesTable = examplesNode.getSingle(RuleType.ExamplesTable); const examples = { id: this.newId(), tags, location: this.getLocation(examplesLine), keyword: examplesLine.matchedKeyword, name: examplesLine.matchedText, description, tableHeader: examplesTable ? examplesTable[0] : undefined, tableBody: examplesTable ? examplesTable.slice(1) : [], }; return examples; } case RuleType.ExamplesTable: { return this.getTableRows(node); } case RuleType.Description: { let lineTokens = node.getTokens(TokenType.Other); // Trim trailing empty lines let end = lineTokens.length; while (end > 0 && lineTokens[end - 1].line.trimmedLineText === '') { end--; } lineTokens = lineTokens.slice(0, end); return lineTokens.map((token) => token.matchedText).join('\n'); } case RuleType.Feature: { const header = node.getSingle(RuleType.FeatureHeader); if (!header) { return null; } const tags = this.getTags(header); const featureLine = header.getToken(TokenType.FeatureLine); if (!featureLine) { return null; } const children = []; const background = node.getSingle(RuleType.Background); if (background) { children.push({ background, }); } for (const scenario of node.getItems(RuleType.ScenarioDefinition)) { children.push({ scenario, }); } for (const rule of node.getItems(RuleType.Rule)) { children.push({ rule, }); } const description = this.getDescription(header); const language = featureLine.matchedGherkinDialect; const feature = { tags, location: this.getLocation(featureLine), language, keyword: featureLine.matchedKeyword, name: featureLine.matchedText, description, children, }; return feature; } case RuleType.Rule: { const header = node.getSingle(RuleType.RuleHeader); if (!header) { return null; } const ruleLine = header.getToken(TokenType.RuleLine); if (!ruleLine) { return null; } const tags = this.getTags(header); const children = []; const background = node.getSingle(RuleType.Background); if (background) { children.push({ background, }); } for (const scenario of node.getItems(RuleType.ScenarioDefinition)) { children.push({ scenario, }); } const description = this.getDescription(header); const rule = { id: this.newId(), location: this.getLocation(ruleLine), keyword: ruleLine.matchedKeyword, name: ruleLine.matchedText, description, children, tags, }; return rule; } case RuleType.GherkinDocument: { const feature = node.getSingle(RuleType.Feature); const gherkinDocument = { feature, comments: this.comments, }; return gherkinDocument; } default: return node; } } } //# 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type {\n  Background,\n  Comment,\n  DataTable,\n  DocString,\n  Examples,\n  Feature,\n  FeatureChild,\n  GherkinDocument,\n  IdGenerator,\n  Location,\n  Rule,\n  RuleChild,\n  Scenario,\n  Step,\n  TableRow,\n  Tag,\n} from '@cucumber/messages'\nimport AstNode from './AstNode.js'\nimport { AstBuilderException } from './Errors.js'\nimport type { IAstBuilder } from './IAstBuilder.js'\nimport type IToken from './IToken.js'\nimport { RuleType, TokenType } from './Parser.js'\n\nexport default class AstBuilder implements IAstBuilder<AstNode, TokenType, RuleType> {\n  stack: AstNode[]\n  comments: Comment[]\n  readonly newId: IdGenerator.NewId\n\n  constructor(newId: IdGenerator.NewId) {\n    this.newId = newId\n    if (!newId) {\n      throw new Error('No newId')\n    }\n    this.reset()\n  }\n\n  reset() {\n    this.stack = [new AstNode(RuleType.None)]\n    this.comments = []\n  }\n\n  startRule(ruleType: RuleType) {\n    this.stack.push(new AstNode(ruleType))\n  }\n\n  endRule() {\n    const node = this.stack.pop()\n    const transformedNode = this.transformNode(node)\n    this.currentNode().add(node.ruleType, transformedNode)\n  }\n\n  build(token: IToken<TokenType>) {\n    if (token.matchedType === TokenType.Comment) {\n      this.comments.push({\n        location: this.getLocation(token),\n        text: token.matchedText,\n      })\n    } else {\n      this.currentNode().add(token.matchedType, token)\n    }\n  }\n\n  getResult() {\n    return this.currentNode().getSingle(RuleType.GherkinDocument)\n  }\n\n  currentNode() {\n    return this.stack[this.stack.length - 1]\n  }\n\n  getLocation(token: IToken<TokenType>, column?: number): Location {\n    return !column ? token.location : { line: token.location.line, column }\n  }\n\n  getTags(node: AstNode) {\n    const tags: Tag[] = []\n    const tagsNode = node.getSingle(RuleType.Tags)\n    if (!tagsNode) {\n      return tags\n    }\n    const tokens = tagsNode.getTokens(TokenType.TagLine)\n    for (const token of tokens) {\n      for (const tagItem of token.matchedItems) {\n        tags.push({\n          location: this.getLocation(token, tagItem.column),\n          name: tagItem.text,\n          id: this.newId(),\n        })\n      }\n    }\n    return tags\n  }\n\n  getCells(tableRowToken: IToken<TokenType>) {\n    return tableRowToken.matchedItems.map((cellItem) => ({\n      location: this.getLocation(tableRowToken, cellItem.column),\n      value: cellItem.text,\n    }))\n  }\n\n  getDescription(node: AstNode) {\n    return node.getSingle(RuleType.Description) || ''\n  }\n\n  getSteps(node: AstNode) {\n    return node.getItems(RuleType.Step)\n  }\n\n  getTableRows(node: AstNode) {\n    const rows = node.getTokens(TokenType.TableRow).map((token) => ({\n      id: this.newId(),\n      location: this.getLocation(token),\n      cells: this.getCells(token),\n    }))\n    this.ensureCellCount(rows)\n    return rows.length === 0 ? [] : rows\n  }\n\n  ensureCellCount(rows: TableRow[]) {\n    if (rows.length === 0) {\n      return\n    }\n    const cellCount = rows[0].cells.length\n\n    rows.forEach((row) => {\n      if (row.cells.length !== cellCount) {\n        throw AstBuilderException.create('inconsistent cell count within the table', row.location)\n      }\n    })\n  }\n\n  transformNode(node: AstNode) {\n    switch (node.ruleType) {\n      case RuleType.Step: {\n        const stepLine = node.getToken(TokenType.StepLine)\n        const dataTable = node.getSingle(RuleType.DataTable)\n        const docString = node.getSingle(RuleType.DocString)\n\n        const location = this.getLocation(stepLine)\n        const step: Step = {\n          id: this.newId(),\n          location,\n          keyword: stepLine.matchedKeyword,\n          keywordType: stepLine.matchedKeywordType,\n          text: stepLine.matchedText,\n          dataTable: dataTable,\n          docString: docString,\n        }\n        return step\n      }\n      case RuleType.DocString: {\n        const separatorToken = node.getTokens(TokenType.DocStringSeparator)[0]\n        const mediaType =\n          separatorToken.matchedText.length > 0 ? separatorToken.matchedText : undefined\n        const lineTokens = node.getTokens(TokenType.Other)\n        const content = lineTokens.map((t) => t.matchedText).join('\\n')\n\n        const result: DocString = {\n          location: this.getLocation(separatorToken),\n          content,\n          delimiter: separatorToken.matchedKeyword,\n        }\n        // conditionally add this like this (needed to make tests pass on node 0.10 as well as 4.0)\n        if (mediaType) {\n          result.mediaType = mediaType\n        }\n        return result\n      }\n      case RuleType.DataTable: {\n        const rows = this.getTableRows(node)\n        const dataTable: DataTable = {\n          location: rows[0].location,\n          rows,\n        }\n        return dataTable\n      }\n      case RuleType.Background: {\n        const backgroundLine = node.getToken(TokenType.BackgroundLine)\n        const description = this.getDescription(node)\n        const steps = this.getSteps(node)\n\n        const background: Background = {\n          id: this.newId(),\n          location: this.getLocation(backgroundLine),\n          keyword: backgroundLine.matchedKeyword,\n          name: backgroundLine.matchedText,\n          description,\n          steps,\n        }\n        return background\n      }\n      case RuleType.ScenarioDefinition: {\n        const tags = this.getTags(node)\n        const scenarioNode = node.getSingle(RuleType.Scenario)\n        const scenarioLine = scenarioNode.getToken(TokenType.ScenarioLine)\n        const description = this.getDescription(scenarioNode)\n        const steps = this.getSteps(scenarioNode)\n        const examples = scenarioNode.getItems(RuleType.ExamplesDefinition)\n        const scenario: Scenario = {\n          id: this.newId(),\n          tags,\n          location: this.getLocation(scenarioLine),\n          keyword: scenarioLine.matchedKeyword,\n          name: scenarioLine.matchedText,\n          description,\n          steps,\n          examples,\n        }\n        return scenario\n      }\n      case RuleType.ExamplesDefinition: {\n        const tags = this.getTags(node)\n        const examplesNode = node.getSingle(RuleType.Examples)\n        const examplesLine = examplesNode.getToken(TokenType.ExamplesLine)\n        const description = this.getDescription(examplesNode)\n        const examplesTable: TableRow[] = examplesNode.getSingle(RuleType.ExamplesTable)\n\n        const examples: Examples = {\n          id: this.newId(),\n          tags,\n          location: this.getLocation(examplesLine),\n          keyword: examplesLine.matchedKeyword,\n          name: examplesLine.matchedText,\n          description,\n          tableHeader: examplesTable ? examplesTable[0] : undefined,\n          tableBody: examplesTable ? examplesTable.slice(1) : [],\n        }\n        return examples\n      }\n      case RuleType.ExamplesTable: {\n        return this.getTableRows(node)\n      }\n      case RuleType.Description: {\n        let lineTokens = node.getTokens(TokenType.Other)\n        // Trim trailing empty lines\n        let end = lineTokens.length\n        while (end > 0 && lineTokens[end - 1].line.trimmedLineText === '') {\n          end--\n        }\n        lineTokens = lineTokens.slice(0, end)\n\n        return lineTokens.map((token) => token.matchedText).join('\\n')\n      }\n\n      case RuleType.Feature: {\n        const header = node.getSingle(RuleType.FeatureHeader)\n        if (!header) {\n          return null\n        }\n        const tags = this.getTags(header)\n        const featureLine = header.getToken(TokenType.FeatureLine)\n        if (!featureLine) {\n          return null\n        }\n        const children: FeatureChild[] = []\n        const background = node.getSingle(RuleType.Background)\n        if (background) {\n          children.push({\n            background,\n          })\n        }\n        for (const scenario of node.getItems(RuleType.ScenarioDefinition)) {\n          children.push({\n            scenario,\n          })\n        }\n        for (const rule of node.getItems(RuleType.Rule)) {\n          children.push({\n            rule,\n          })\n        }\n\n        const description = this.getDescription(header)\n        const language = featureLine.matchedGherkinDialect\n\n        const feature: Feature = {\n          tags,\n          location: this.getLocation(featureLine),\n          language,\n          keyword: featureLine.matchedKeyword,\n          name: featureLine.matchedText,\n          description,\n          children,\n        }\n        return feature\n      }\n\n      case RuleType.Rule: {\n        const header = node.getSingle(RuleType.RuleHeader)\n        if (!header) {\n          return null\n        }\n        const ruleLine = header.getToken(TokenType.RuleLine)\n        if (!ruleLine) {\n          return null\n        }\n        const tags = this.getTags(header)\n        const children: RuleChild[] = []\n        const background = node.getSingle(RuleType.Background)\n        if (background) {\n          children.push({\n            background,\n          })\n        }\n        for (const scenario of node.getItems(RuleType.ScenarioDefinition)) {\n          children.push({\n            scenario,\n          })\n        }\n        const description = this.getDescription(header)\n\n        const rule: Rule = {\n          id: this.newId(),\n          location: this.getLocation(ruleLine),\n          keyword: ruleLine.matchedKeyword,\n          name: ruleLine.matchedText,\n          description,\n          children,\n          tags,\n        }\n        return rule\n      }\n      case RuleType.GherkinDocument: {\n        const feature = node.getSingle(RuleType.Feature)\n\n        const gherkinDocument: GherkinDocument = {\n          feature,\n          comments: this.comments,\n        }\n        return gherkinDocument\n      }\n      default:\n        return node\n    }\n  }\n}\n"]}