Adding documentation to charset_range.js

This commit is contained in:
Jeff Avallone 2015-04-19 20:35:55 -04:00
parent 7ca4b95cd7
commit d8a635fa8f

View File

@ -1,9 +1,13 @@
// 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() {
var contents = [
this.first,
@ -11,11 +15,13 @@ export default {
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
});
@ -23,9 +29,12 @@ export default {
},
setup() {
// The two nodes for the range. In `[a-z]` these would be
// [Literal](./literal.html) 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 `Range out of order in character class: ${this.textValue}`;
}