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Adding documentation to charset_range.js

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This commit is contained in:
Jeff Avallone 2015-04-19 20:35:55 -04:00
parent 7ca4b95cd7
commit d8a635fa8f
1 changed files with 9 additions and 0 deletions
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9
src/js/parser/javascript/charset_range.js
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@ -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 util from '../../util.js';
import _ from 'lodash'; import _ from 'lodash';
export default { export default {
type: 'charset-range', type: 'charset-range',
// Renders the charset range into the currently set container
_render() { _render() {
var contents = [ var contents = [
this.first, this.first,
@ -11,11 +15,13 @@ export default {
this.last this.last
]; ];
// Render the nodes of the range.
return Promise.all([ return Promise.all([
this.first.render(this.container.group()), this.first.render(this.container.group()),
this.last.render(this.container.group()) this.last.render(this.container.group())
]) ])
.then(() => { .then(() => {
// Space the nodes and hyphen horizontally.
util.spaceHorizontally(contents, { util.spaceHorizontally(contents, {
padding: 5 padding: 5
}); });
@ -23,9 +29,12 @@ export default {
}, },
setup() { 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.first = this.properties.first;
this.last = this.properties.last; this.last = this.properties.last;
// Report invalid expression when extents of the range are out of order.
if (this.first.ordinal > this.last.ordinal) { if (this.first.ordinal > this.last.ordinal) {
throw `Range out of order in character class: ${this.textValue}`; throw `Range out of order in character class: ${this.textValue}`;
} }