@cucumber/gherkin
Version:
Gherkin parser
220 lines • 32.2 kB
JavaScript
import { StepKeywordType } from '@cucumber/messages';
import { compareStepKeywords } from './compareStepKeywords.js';
import countSymbols from './countSymbols.js';
import { NoSuchLanguageException, ParserException } from './Errors.js';
import DIALECTS from './gherkin-languages.json' with { type: 'json' };
import { TokenType } from './Parser.js';
const DIALECT_DICT = DIALECTS;
const LANGUAGE_PATTERN = /^\s*#\s*language\s*:\s*([a-zA-Z\-_]+)\s*$/;
function addKeywordTypeMappings(h, keywords, keywordType) {
for (const k of keywords) {
if (!(k in h)) {
h[k] = [];
}
h[k].push(keywordType);
}
}
export default class GherkinClassicTokenMatcher {
defaultDialectName;
dialect;
dialectName;
activeDocStringSeparator;
indentToRemove;
keywordTypesMap;
sortedStepKeywords;
constructor(defaultDialectName = 'en') {
this.defaultDialectName = defaultDialectName;
this.reset();
}
changeDialect(newDialectName, location) {
const newDialect = DIALECT_DICT[newDialectName];
if (!newDialect) {
throw NoSuchLanguageException.create(newDialectName, location);
}
this.dialectName = newDialectName;
this.dialect = newDialect;
this.initializeKeywordTypes();
this.initializeSortedStepKeywords();
}
reset() {
if (this.dialectName !== this.defaultDialectName) {
this.changeDialect(this.defaultDialectName);
}
this.activeDocStringSeparator = null;
this.indentToRemove = 0;
}
initializeKeywordTypes() {
this.keywordTypesMap = {};
addKeywordTypeMappings(this.keywordTypesMap, this.dialect.given, StepKeywordType.CONTEXT);
addKeywordTypeMappings(this.keywordTypesMap, this.dialect.when, StepKeywordType.ACTION);
addKeywordTypeMappings(this.keywordTypesMap, this.dialect.then, StepKeywordType.OUTCOME);
addKeywordTypeMappings(this.keywordTypesMap, [].concat(this.dialect.and).concat(this.dialect.but), StepKeywordType.CONJUNCTION);
}
initializeSortedStepKeywords() {
this.sortedStepKeywords = []
.concat(this.dialect.given)
.concat(this.dialect.when)
.concat(this.dialect.then)
.concat(this.dialect.and)
.concat(this.dialect.but)
.sort(compareStepKeywords);
}
match_TagLine(token) {
if (token.line.startsWith('@')) {
this.setTokenMatched(token, TokenType.TagLine, null, null, null, null, this.getTags(token.line));
return true;
}
return false;
}
match_FeatureLine(token) {
return this.matchTitleLine(token, TokenType.FeatureLine, this.dialect.feature);
}
match_ScenarioLine(token) {
return (this.matchTitleLine(token, TokenType.ScenarioLine, this.dialect.scenario) ||
this.matchTitleLine(token, TokenType.ScenarioLine, this.dialect.scenarioOutline));
}
match_BackgroundLine(token) {
return this.matchTitleLine(token, TokenType.BackgroundLine, this.dialect.background);
}
match_ExamplesLine(token) {
return this.matchTitleLine(token, TokenType.ExamplesLine, this.dialect.examples);
}
match_RuleLine(token) {
return this.matchTitleLine(token, TokenType.RuleLine, this.dialect.rule);
}
match_TableRow(token) {
if (token.line.startsWith('|')) {
// TODO: indent
this.setTokenMatched(token, TokenType.TableRow, null, null, null, null, token.line.getTableCells());
return true;
}
return false;
}
match_Empty(token) {
if (token.line.isEmpty) {
this.setTokenMatched(token, TokenType.Empty, null, null, 0);
return true;
}
return false;
}
match_Comment(token) {
if (token.line.startsWith('#')) {
const text = token.line.getLineText(0); // take the entire line, including leading space
this.setTokenMatched(token, TokenType.Comment, text, null, 0);
return true;
}
return false;
}
match_Language(token) {
const match = token.line.trimmedLineText.match(LANGUAGE_PATTERN);
if (match) {
const newDialectName = match[1];
this.setTokenMatched(token, TokenType.Language, newDialectName);
this.changeDialect(newDialectName, token.location);
return true;
}
return false;
}
match_DocStringSeparator(token) {
return this.activeDocStringSeparator == null
? // open
this._match_DocStringSeparator(token, '"""', true) ||
this._match_DocStringSeparator(token, '```', true)
: // close
this._match_DocStringSeparator(token, this.activeDocStringSeparator, false);
}
_match_DocStringSeparator(token, separator, isOpen) {
if (token.line.startsWith(separator)) {
let mediaType = null;
if (isOpen) {
mediaType = token.line.getRestTrimmed(separator.length);
this.activeDocStringSeparator = separator;
this.indentToRemove = token.line.indent;
}
else {
this.activeDocStringSeparator = null;
this.indentToRemove = 0;
}
this.setTokenMatched(token, TokenType.DocStringSeparator, mediaType, separator);
return true;
}
return false;
}
match_EOF(token) {
if (token.isEof) {
this.setTokenMatched(token, TokenType.EOF);
return true;
}
return false;
}
match_StepLine(token) {
for (const keyword of this.sortedStepKeywords) {
if (token.line.startsWith(keyword)) {
const title = token.line.getRestTrimmed(keyword.length);
const keywordTypes = this.keywordTypesMap[keyword];
let keywordType = keywordTypes[0];
if (keywordTypes.length > 1) {
keywordType = StepKeywordType.UNKNOWN;
}
this.setTokenMatched(token, TokenType.StepLine, title, keyword, null, keywordType);
return true;
}
}
return false;
}
match_Other(token) {
const text = token.line.getLineText(this.indentToRemove); // take the entire line, except removing DocString indents
this.setTokenMatched(token, TokenType.Other, this.unescapeDocString(text), null, 0);
return true;
}
getTags(line) {
const uncommentedLine = line.trimmedLineText.split(/\s#/g, 2)[0];
let column = line.indent + 1;
const items = uncommentedLine.split('@');
const tags = [];
for (let i = 0; i < items.length; i++) {
const item = items[i].trimRight();
if (item.length === 0) {
continue;
}
if (!item.match(/^\S+$/)) {
throw ParserException.create('A tag may not contain whitespace', line.lineNumber, column);
}
const span = { column, text: `@${item}` };
tags.push(span);
column += countSymbols(items[i]) + 1;
}
return tags;
}
matchTitleLine(token, tokenType, keywords) {
for (const keyword of keywords) {
if (token.line.startsWithTitleKeyword(keyword)) {
const title = token.line.getRestTrimmed(keyword.length + ':'.length);
this.setTokenMatched(token, tokenType, title, keyword);
return true;
}
}
return false;
}
setTokenMatched(token, matchedType, text, keyword, indent, keywordType, items) {
token.matchedType = matchedType;
token.matchedText = text;
token.matchedKeyword = keyword;
token.matchedKeywordType = keywordType;
token.matchedIndent =
typeof indent === 'number' ? indent : token.line == null ? 0 : token.line.indent;
token.matchedItems = items || [];
token.location.column = token.matchedIndent + 1;
token.matchedGherkinDialect = this.dialectName;
}
unescapeDocString(text) {
if (this.activeDocStringSeparator === '"""') {
return text.replace('\\"\\"\\"', '"""');
}
if (this.activeDocStringSeparator === '```') {
return text.replace('\\`\\`\\`', '```');
}
return text;
}
}
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{ type Location, StepKeywordType } from '@cucumber/messages'\nimport { compareStepKeywords } from './compareStepKeywords.js'\nimport countSymbols from './countSymbols.js'\nimport type Dialect from './Dialect.js'\nimport { NoSuchLanguageException, ParserException } from './Errors.js'\nimport DIALECTS from './gherkin-languages.json' with { type: 'json' }\nimport type IToken from './IToken.js'\nimport type { IGherkinLine, Item } from './IToken.js'\nimport type ITokenMatcher from './ITokenMatcher.js'\nimport { TokenType } from './Parser.js'\n\nconst DIALECT_DICT: { [key: string]: Dialect } = DIALECTS\nconst LANGUAGE_PATTERN = /^\\s*#\\s*language\\s*:\\s*([a-zA-Z\\-_]+)\\s*$/\n\nfunction addKeywordTypeMappings(\n  h: { [key: string]: StepKeywordType[] },\n  keywords: readonly string[],\n  keywordType: StepKeywordType\n) {\n  for (const k of keywords) {\n    if (!(k in h)) {\n      h[k] = [] as StepKeywordType[]\n    }\n    h[k].push(keywordType)\n  }\n}\n\nexport default class GherkinClassicTokenMatcher implements ITokenMatcher<TokenType> {\n  private dialect: Dialect\n  private dialectName: string\n  private activeDocStringSeparator: string\n  private indentToRemove: number\n  private keywordTypesMap: { [key: string]: StepKeywordType[] }\n  private sortedStepKeywords: readonly string[]\n\n  constructor(private readonly defaultDialectName: string = 'en') {\n    this.reset()\n  }\n\n  changeDialect(newDialectName: string, location?: Location) {\n    const newDialect = DIALECT_DICT[newDialectName]\n    if (!newDialect) {\n      throw NoSuchLanguageException.create(newDialectName, location)\n    }\n\n    this.dialectName = newDialectName\n    this.dialect = newDialect\n    this.initializeKeywordTypes()\n    this.initializeSortedStepKeywords()\n  }\n\n  reset() {\n    if (this.dialectName !== this.defaultDialectName) {\n      this.changeDialect(this.defaultDialectName)\n    }\n    this.activeDocStringSeparator = null\n    this.indentToRemove = 0\n  }\n\n  initializeKeywordTypes() {\n    this.keywordTypesMap = {}\n    addKeywordTypeMappings(this.keywordTypesMap, this.dialect.given, StepKeywordType.CONTEXT)\n    addKeywordTypeMappings(this.keywordTypesMap, this.dialect.when, StepKeywordType.ACTION)\n    addKeywordTypeMappings(this.keywordTypesMap, this.dialect.then, StepKeywordType.OUTCOME)\n    addKeywordTypeMappings(\n      this.keywordTypesMap,\n      [].concat(this.dialect.and).concat(this.dialect.but),\n      StepKeywordType.CONJUNCTION\n    )\n  }\n\n  initializeSortedStepKeywords() {\n    this.sortedStepKeywords = []\n      .concat(this.dialect.given)\n      .concat(this.dialect.when)\n      .concat(this.dialect.then)\n      .concat(this.dialect.and)\n      .concat(this.dialect.but)\n      .sort(compareStepKeywords)\n  }\n\n  match_TagLine(token: IToken<TokenType>) {\n    if (token.line.startsWith('@')) {\n      this.setTokenMatched(\n        token,\n        TokenType.TagLine,\n        null,\n        null,\n        null,\n        null,\n        this.getTags(token.line)\n      )\n      return true\n    }\n    return false\n  }\n\n  match_FeatureLine(token: IToken<TokenType>) {\n    return this.matchTitleLine(token, TokenType.FeatureLine, this.dialect.feature)\n  }\n\n  match_ScenarioLine(token: IToken<TokenType>) {\n    return (\n      this.matchTitleLine(token, TokenType.ScenarioLine, this.dialect.scenario) ||\n      this.matchTitleLine(token, TokenType.ScenarioLine, this.dialect.scenarioOutline)\n    )\n  }\n\n  match_BackgroundLine(token: IToken<TokenType>) {\n    return this.matchTitleLine(token, TokenType.BackgroundLine, this.dialect.background)\n  }\n\n  match_ExamplesLine(token: IToken<TokenType>) {\n    return this.matchTitleLine(token, TokenType.ExamplesLine, this.dialect.examples)\n  }\n\n  match_RuleLine(token: IToken<TokenType>) {\n    return this.matchTitleLine(token, TokenType.RuleLine, this.dialect.rule)\n  }\n\n  match_TableRow(token: IToken<TokenType>) {\n    if (token.line.startsWith('|')) {\n      // TODO: indent\n      this.setTokenMatched(\n        token,\n        TokenType.TableRow,\n        null,\n        null,\n        null,\n        null,\n        token.line.getTableCells()\n      )\n      return true\n    }\n    return false\n  }\n\n  match_Empty(token: IToken<TokenType>) {\n    if (token.line.isEmpty) {\n      this.setTokenMatched(token, TokenType.Empty, null, null, 0)\n      return true\n    }\n    return false\n  }\n\n  match_Comment(token: IToken<TokenType>) {\n    if (token.line.startsWith('#')) {\n      const text = token.line.getLineText(0) // take the entire line, including leading space\n      this.setTokenMatched(token, TokenType.Comment, text, null, 0)\n      return true\n    }\n    return false\n  }\n\n  match_Language(token: IToken<TokenType>) {\n    const match = token.line.trimmedLineText.match(LANGUAGE_PATTERN)\n    if (match) {\n      const newDialectName = match[1]\n      this.setTokenMatched(token, TokenType.Language, newDialectName)\n\n      this.changeDialect(newDialectName, token.location)\n      return true\n    }\n    return false\n  }\n\n  match_DocStringSeparator(token: IToken<TokenType>) {\n    return this.activeDocStringSeparator == null\n      ? // open\n        this._match_DocStringSeparator(token, '\"\"\"', true) ||\n          this._match_DocStringSeparator(token, '```', true)\n      : // close\n        this._match_DocStringSeparator(token, this.activeDocStringSeparator, false)\n  }\n\n  public _match_DocStringSeparator(token: IToken<TokenType>, separator: string, isOpen: boolean) {\n    if (token.line.startsWith(separator)) {\n      let mediaType = null\n      if (isOpen) {\n        mediaType = token.line.getRestTrimmed(separator.length)\n        this.activeDocStringSeparator = separator\n        this.indentToRemove = token.line.indent\n      } else {\n        this.activeDocStringSeparator = null\n        this.indentToRemove = 0\n      }\n\n      this.setTokenMatched(token, TokenType.DocStringSeparator, mediaType, separator)\n      return true\n    }\n    return false\n  }\n\n  match_EOF(token: IToken<TokenType>) {\n    if (token.isEof) {\n      this.setTokenMatched(token, TokenType.EOF)\n      return true\n    }\n    return false\n  }\n\n  match_StepLine(token: IToken<TokenType>) {\n    for (const keyword of this.sortedStepKeywords) {\n      if (token.line.startsWith(keyword)) {\n        const title = token.line.getRestTrimmed(keyword.length)\n        const keywordTypes = this.keywordTypesMap[keyword]\n        let keywordType = keywordTypes[0]\n        if (keywordTypes.length > 1) {\n          keywordType = StepKeywordType.UNKNOWN\n        }\n\n        this.setTokenMatched(token, TokenType.StepLine, title, keyword, null, keywordType)\n        return true\n      }\n    }\n\n    return false\n  }\n\n  match_Other(token: IToken<TokenType>) {\n    const text = token.line.getLineText(this.indentToRemove) // take the entire line, except removing DocString indents\n    this.setTokenMatched(token, TokenType.Other, this.unescapeDocString(text), null, 0)\n    return true\n  }\n\n  getTags(line: IGherkinLine): readonly Item[] {\n    const uncommentedLine = line.trimmedLineText.split(/\\s#/g, 2)[0]\n    let column = line.indent + 1\n    const items = uncommentedLine.split('@')\n    const tags: Item[] = []\n    for (let i = 0; i < items.length; i++) {\n      const item = items[i].trimRight()\n      if (item.length === 0) {\n        continue\n      }\n      if (!item.match(/^\\S+$/)) {\n        throw ParserException.create('A tag may not contain whitespace', line.lineNumber, column)\n      }\n      const span = { column, text: `@${item}` }\n      tags.push(span)\n      column += countSymbols(items[i]) + 1\n    }\n    return tags\n  }\n\n  private matchTitleLine(\n    token: IToken<TokenType>,\n    tokenType: TokenType,\n    keywords: readonly string[]\n  ): boolean {\n    for (const keyword of keywords) {\n      if (token.line.startsWithTitleKeyword(keyword)) {\n        const title = token.line.getRestTrimmed(keyword.length + ':'.length)\n        this.setTokenMatched(token, tokenType, title, keyword)\n        return true\n      }\n    }\n    return false\n  }\n\n  private setTokenMatched(\n    token: IToken<TokenType>,\n    matchedType: TokenType,\n    text?: string,\n    keyword?: string,\n    indent?: number,\n    keywordType?: StepKeywordType,\n    items?: readonly Item[]\n  ) {\n    token.matchedType = matchedType\n    token.matchedText = text\n    token.matchedKeyword = keyword\n    token.matchedKeywordType = keywordType\n    token.matchedIndent =\n      typeof indent === 'number' ? indent : token.line == null ? 0 : token.line.indent\n    token.matchedItems = items || []\n\n    token.location.column = token.matchedIndent + 1\n    token.matchedGherkinDialect = this.dialectName\n  }\n\n  private unescapeDocString(text: string) {\n    if (this.activeDocStringSeparator === '\"\"\"') {\n      return text.replace('\\\\\"\\\\\"\\\\\"', '\"\"\"')\n    }\n    if (this.activeDocStringSeparator === '```') {\n      return text.replace('\\\\`\\\\`\\\\`', '```')\n    }\n    return text\n  }\n}\n"]}