• charset_range.js

  • ¶

    CharsetRange nodes are used for [a-z] regular expression syntax. The two literal or escape nodes are rendered with a hyphen between them.

    import util from '../../util.js';
import _ from 'lodash';

export default {
  type: 'charset-range',
  • ¶

    Renders the charset range into the currently set container

      _render() {
    let contents = [
      this.first,
      this.container.text(0, 0, '-'),
      this.last
    ];
  • ¶

    Render the nodes of the range.

        return Promise.all([
      this.first.render(this.container.group()),
      this.last.render(this.container.group())
    ])
      .then(() => {
  • ¶

    Space the nodes and hyphen horizontally.

            util.spaceHorizontally(contents, {
          padding: 5
        });
      });
  },

  setup() {
  • ¶

    The two nodes for the range. In [a-z] these would be Literal nodes for “a” and “z”.

        this.first = this.properties.first;
    this.last = this.properties.last;
  • ¶

    Report invalid expression when extents of the range are out of order.

        if (this.first.ordinal > this.last.ordinal) {
      throw `字符集乱序: ${this.textValue}`;
    }
  }
};