site_opytex/theme/node_modules/expand-brackets/lib/parsers.js

220 lines
4.3 KiB
JavaScript

'use strict';
var utils = require('./utils');
var define = require('define-property');
/**
* Text regex
*/
var TEXT_REGEX = '(\\[(?=.*\\])|\\])+';
var not = utils.createRegex(TEXT_REGEX);
/**
* Brackets parsers
*/
function parsers(brackets) {
brackets.state = brackets.state || {};
brackets.parser.sets.bracket = brackets.parser.sets.bracket || [];
brackets.parser
.capture('escape', function() {
if (this.isInside('bracket')) return;
var pos = this.position();
var m = this.match(/^\\(.)/);
if (!m) return;
return pos({
type: 'escape',
val: m[0]
});
})
/**
* Text parser
*/
.capture('text', function() {
if (this.isInside('bracket')) return;
var pos = this.position();
var m = this.match(not);
if (!m || !m[0]) return;
return pos({
type: 'text',
val: m[0]
});
})
/**
* POSIX character classes: "[[:alpha:][:digits:]]"
*/
.capture('posix', function() {
var pos = this.position();
var m = this.match(/^\[:(.*?):\](?=.*\])/);
if (!m) return;
var inside = this.isInside('bracket');
if (inside) {
brackets.posix++;
}
return pos({
type: 'posix',
insideBracket: inside,
inner: m[1],
val: m[0]
});
})
/**
* Bracket (noop)
*/
.capture('bracket', function() {})
/**
* Open: '['
*/
.capture('bracket.open', function() {
var parsed = this.parsed;
var pos = this.position();
var m = this.match(/^\[(?=.*\])/);
if (!m) return;
var prev = this.prev();
var last = utils.last(prev.nodes);
if (parsed.slice(-1) === '\\' && !this.isInside('bracket')) {
last.val = last.val.slice(0, last.val.length - 1);
return pos({
type: 'escape',
val: m[0]
});
}
var open = pos({
type: 'bracket.open',
val: m[0]
});
if (last.type === 'bracket.open' || this.isInside('bracket')) {
open.val = '\\' + open.val;
open.type = 'bracket.inner';
open.escaped = true;
return open;
}
var node = pos({
type: 'bracket',
nodes: [open]
});
define(node, 'parent', prev);
define(open, 'parent', node);
this.push('bracket', node);
prev.nodes.push(node);
})
/**
* Bracket text
*/
.capture('bracket.inner', function() {
if (!this.isInside('bracket')) return;
var pos = this.position();
var m = this.match(not);
if (!m || !m[0]) return;
var next = this.input.charAt(0);
var val = m[0];
var node = pos({
type: 'bracket.inner',
val: val
});
if (val === '\\\\') {
return node;
}
var first = val.charAt(0);
var last = val.slice(-1);
if (first === '!') {
val = '^' + val.slice(1);
}
if (last === '\\' || (val === '^' && next === ']')) {
val += this.input[0];
this.consume(1);
}
node.val = val;
return node;
})
/**
* Close: ']'
*/
.capture('bracket.close', function() {
var parsed = this.parsed;
var pos = this.position();
var m = this.match(/^\]/);
if (!m) return;
var prev = this.prev();
var last = utils.last(prev.nodes);
if (parsed.slice(-1) === '\\' && !this.isInside('bracket')) {
last.val = last.val.slice(0, last.val.length - 1);
return pos({
type: 'escape',
val: m[0]
});
}
var node = pos({
type: 'bracket.close',
rest: this.input,
val: m[0]
});
if (last.type === 'bracket.open') {
node.type = 'bracket.inner';
node.escaped = true;
return node;
}
var bracket = this.pop('bracket');
if (!this.isType(bracket, 'bracket')) {
if (this.options.strict) {
throw new Error('missing opening "["');
}
node.type = 'bracket.inner';
node.escaped = true;
return node;
}
bracket.nodes.push(node);
define(node, 'parent', bracket);
});
}
/**
* Brackets parsers
*/
module.exports = parsers;
/**
* Expose text regex
*/
module.exports.TEXT_REGEX = TEXT_REGEX;