Method toString

lib/parser.js:25–58

()

  }

  toString() {
    const lines = this.source.split(/\r?\n/);
    const startLine = Math.max(this.line - 3, 0);
    const endLine = Math.min(this.line + 2, lines.length);
    const lineNumberWidth = String(endLine).length;
    const startColumn = Math.max(this.column - 54, 0);
    const endColumn = Math.max(this.column + 20, 80);
    const code = lines
      .slice(startLine, endLine)
      .map((line, index) => {
        const lineSlice = line.slice(startColumn, endColumn);
        let ellipsisPrefix = '';
        let ellipsisSuffix = '';
        if (startColumn !== 0) {
          ellipsisPrefix = startColumn > line.length - 1 ? ' ' : '…';
        }
        if (endColumn < line.length - 1) {
          ellipsisSuffix = '…';
        }
        const number = startLine + 1 + index;
        const gutter = ` ${number.toString().padStart(lineNumberWidth)} | `;
        if (number === this.line) {
          const gutterSpacing = gutter.replace(/[^|]/g, ' ');
          const lineSpacing = (
            ellipsisPrefix + line.slice(startColumn, this.column - 1)
          ).replace(/[^\t]/g, ' ');
          const spacing = gutterSpacing + lineSpacing;
          return `>${gutter}${ellipsisPrefix}${lineSlice}${ellipsisSuffix}\n ${spacing}^`;
        }
        return ` ${gutter}${ellipsisPrefix}${lineSlice}${ellipsisSuffix}`;
      })
      .join('\n');
    return `${this.name}: ${this.message}\n\n${code}\n`;
  }
}

const entityDeclaration = /<!ENTITY\s+(\S+)\s+(?:'([^']+)'|"([^"]+)")\s*>/g;