How to use graphql-language-service-parser - 10 common examples

function runOnlineParser(
  queryText: string,
  callback: callbackFnType,
): ContextToken {
  const lines = queryText.split('\n');
  const parser = onlineParser();
  let state = parser.startState();
  let style = '';

  let stream: CharacterStream = new CharacterStream('');

  for (let i = 0; i < lines.length; i++) {
    stream = new CharacterStream(lines[i]);
    // Stop the parsing when the stream arrives at the current cursor position
    while (!stream.eol()) {
      style = parser.token(stream, state);
      const code = callback(stream, state, style, i);
      if (code === 'BREAK') {
        break;
      }
    }

    if (!state.kind) {
      state = parser.startState();
    }
  }

  return {
    start: stream.getStartOfToken(),

function runOnlineParser(
  queryText: string,
  callback: callbackFnType,
): ContextToken {
  const lines = queryText.split('\n');
  const parser = onlineParser();
  let state = parser.startState();
  let style = '';

  let stream: CharacterStream = new CharacterStream('');

  for (let i = 0; i < lines.length; i++) {
    stream = new CharacterStream(lines[i]);
    while (!stream.eol()) {
      style = parser.token(stream, state);
      const code = callback(stream, state, style, i);
      if (code === 'BREAK') {
        break;
      }
    }

    // Above while loop won't run if there is an empty line.
    // Run the callback one more time to catch this.
    callback(stream, state, style, i);

    if (!state.kind) {

function runOnlineParser(
  queryText: string,
  callback: callbackFnType,
): ContextToken {
  const lines = queryText.split('\n');
  const parser = onlineParser();
  let state = parser.startState();
  let style = '';

  let stream: CharacterStream = new CharacterStream('');

  for (let i = 0; i < lines.length; i++) {
    stream = new CharacterStream(lines[i]);
    // Stop the parsing when the stream arrives at the current cursor position
    while (!stream.eol()) {
      style = parser.token(stream, state);
      const code = callback(stream, state, style, i);
      if (code === 'BREAK') {
        break;
      }
    }

    if (!state.kind) {
      state = parser.startState();
    }
  }

function runOnlineParser(
  queryText: string,
  callback: callbackFnType,
): ContextToken {
  const lines = queryText.split('\n');
  const parser = onlineParser();
  let state = parser.startState();
  let style = '';

  let stream: CharacterStream = new CharacterStream('');

  for (let i = 0; i < lines.length; i++) {
    stream = new CharacterStream(lines[i]);
    while (!stream.eol()) {
      style = parser.token(stream, state);
      const code = callback(stream, state, style, i);
      if (code === 'BREAK') {
        break;
      }
    }

    // Above while loop won't run if there is an empty line.
    // Run the callback one more time to catch this.
    callback(stream, state, style, i);

    if (!state.kind) {
      state = parser.startState();
    }
  }

function runOnlineParser(
  queryText: string,
  callback: callbackFnType,
): ContextToken {
  const lines = queryText.split('\n');
  const parser = onlineParser();
  let state = parser.startState();
  let style = '';

  let stream: CharacterStream = new CharacterStream('');

  for (let i = 0; i < lines.length; i++) {
    stream = new CharacterStream(lines[i]);
    // Stop the parsing when the stream arrives at the current cursor position
    while (!stream.eol()) {
      style = parser.token(stream, state);
      const code = callback(stream, state, style, i);
      if (code === 'BREAK') {
        break;
      }
    }

function runOnlineParser(
  queryText: string,
  callback: callbackFnType,
): ContextToken {
  const lines = queryText.split('\n');
  const parser = onlineParser();
  let state = parser.startState();
  let style = '';

  let stream: CharacterStream = new CharacterStream('');

  for (let i = 0; i < lines.length; i++) {
    stream = new CharacterStream(lines[i]);
    while (!stream.eol()) {
      style = parser.token(stream, state);
      const code = callback(stream, state, style, i);
      if (code === 'BREAK') {
        break;
      }
    }

    // Above while loop won't run if there is an empty line.

case 'Keyword':
        switch (token.value) {
          case 'true':
          case 'false':
            return 'BooleanValue';
          case 'null':
            return 'NullValue';
        }
        return null;
    }
  },
  NumberValue: [t('Number', 'number')],
  StringValue: [t('String', 'string')],
  BooleanValue: [t('Keyword', 'builtin')],
  NullValue: [t('Keyword', 'keyword')],
  ListValue: [p('['), list('Value', opt(p(','))), p(']')],
  ObjectValue: [p('{'), list('ObjectField', opt(p(','))), p('}')],
  ObjectField: [namedKey('attribute'), p(':'), 'Value'],
};

// A namedKey Token which will decorate the state with a `name`
function namedKey(style) {
  return {
    style,
    match: token => token.kind === 'String',
    update(state, token) {
      state.name = token.value.slice(1, -1); // Remove quotes.
    },
  };
}

// JSON Number.
  Number: /^-?(?:0|(?:[1-9][0-9]*))(?:\.[0-9]*)?(?:[eE][+-]?[0-9]+)?/,

  // JSON String.
  String: /^"(?:[^"\\]|\\(?:"|\/|\\|b|f|n|r|t|u[0-9a-fA-F]{4}))*"?/,

  // JSON literal keywords.
  Keyword: /^true|false|null/,
};

/**
 * The parser rules for JSON.
 */
const ParseRules = {
  Document: [p('{'), list('Variable', opt(p(','))), p('}')],
  Variable: [namedKey('variable'), p(':'), 'Value'],
  Value(token) {
    switch (token.kind) {
      case 'Number':
        return 'NumberValue';
      case 'String':
        return 'StringValue';
      case 'Punctuation':
        switch (token.value) {
          case '[':
            return 'ListValue';
          case '{':
            return 'ObjectValue';
        }
        return null;
      case 'Keyword':

// JSON Number.
  Number: /^-?(?:0|(?:[1-9][0-9]*))(?:\.[0-9]*)?(?:[eE][+-]?[0-9]+)?/,

  // JSON String.
  String: /^"(?:[^"\\]|\\(?:"|\/|\\|b|f|n|r|t|u[0-9a-fA-F]{4}))*"?/,

  // JSON literal keywords.
  Keyword: /^true|false|null/,
};

/**
 * The parser rules for JSON.
 */
const ParseRules = {
  Document: [p('{'), list('Entry', p(',')), p('}')],
  Entry: [t('String', 'def'), p(':'), 'Value'],
  Value(token) {
    switch (token.kind) {
      case 'Number':
        return 'NumberValue';
      case 'String':
        return 'StringValue';
      case 'Punctuation':
        switch (token.value) {
          case '[':
            return 'ListValue';
          case '{':
            return 'ObjectValue';
        }
        return null;
      case 'Keyword':

switch (token.value) {
          case 'true':
          case 'false':
            return 'BooleanValue';
          case 'null':
            return 'NullValue';
        }
        return null;
    }
  },
  NumberValue: [t('Number', 'number')],
  StringValue: [t('String', 'string')],
  BooleanValue: [t('Keyword', 'builtin')],
  NullValue: [t('Keyword', 'keyword')],
  ListValue: [p('['), list('Value', opt(p(','))), p(']')],
  ObjectValue: [p('{'), list('ObjectField', opt(p(','))), p('}')],
  ObjectField: [namedKey('attribute'), p(':'), 'Value'],
};

// A namedKey Token which will decorate the state with a `name`
function namedKey(style) {
  return {
    style,
    match: token => token.kind === 'String',
    update(state, token) {
      state.name = token.value.slice(1, -1); // Remove quotes.
    },
  };
}