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'use strict';
var utils = require('./utils');
module.exports = function(braces, options) {
braces.compiler
/**
* bos
*/
.set('bos', function() {
if (this.output) return;
this.ast.queue = isEscaped(this.ast) ? [this.ast.val] : [];
this.ast.count = 1;
})
/**
* Square brackets
*/
.set('bracket', function(node) {
var close = node.close;
var open = !node.escaped ? '[' : '\\[';
var negated = node.negated;
var inner = node.inner;
inner = inner.replace(/\\(?=[\\\w]|$)/g, '\\\\');
if (inner === ']-') {
inner = '\\]\\-';
}
if (negated && inner.indexOf('.') === -1) {
inner += '.';
}
if (negated && inner.indexOf('/') === -1) {
inner += '/';
}
var val = open + negated + inner + close;
var queue = node.parent.queue;
var last = utils.arrayify(queue.pop());
queue.push(utils.join(last, val));
queue.push.apply(queue, []);
})
/**
* Brace
*/
.set('brace', function(node) {
node.queue = isEscaped(node) ? [node.val] : [];
node.count = 1;
return this.mapVisit(node.nodes);
})
/**
* Open
*/
.set('brace.open', function(node) {
node.parent.open = node.val;
})
/**
* Inner
*/
.set('text', function(node) {
var queue = node.parent.queue;
var escaped = node.escaped;
var segs = [node.val];
if (node.optimize === false) {
options = utils.extend({}, options, {optimize: false});
}
if (node.multiplier > 1) {
node.parent.count *= node.multiplier;
}
if (options.quantifiers === true && utils.isQuantifier(node.val)) {
escaped = true;
} else if (node.val.length > 1) {
if (isType(node.parent, 'brace') && !isEscaped(node)) {
var expanded = utils.expand(node.val, options);
segs = expanded.segs;
if (expanded.isOptimized) {
node.parent.isOptimized = true;
}
// if nothing was expanded, we probably have a literal brace
if (!segs.length) {
var val = (expanded.val || node.val);
if (options.unescape !== false) {
// unescape unexpanded brace sequence/set separators
val = val.replace(/\\([,.])/g, '$1');
// strip quotes
val = val.replace(/["'`]/g, '');
}
segs = [val];
escaped = true;
}
}
} else if (node.val === ',') {
if (options.expand) {
node.parent.queue.push(['']);
segs = [''];
} else {
segs = ['|'];
}
} else {
escaped = true;
}
if (escaped && isType(node.parent, 'brace')) {
if (node.parent.nodes.length <= 4 && node.parent.count === 1) {
node.parent.escaped = true;
} else if (node.parent.length <= 3) {
node.parent.escaped = true;
}
}
if (!hasQueue(node.parent)) {
node.parent.queue = segs;
return;
}
var last = utils.arrayify(queue.pop());
if (node.parent.count > 1 && options.expand) {
last = multiply(last, node.parent.count);
node.parent.count = 1;
}
queue.push(utils.join(utils.flatten(last), segs.shift()));
queue.push.apply(queue, segs);
})
/**
* Close
*/
.set('brace.close', function(node) {
var queue = node.parent.queue;
var prev = node.parent.parent;
var last = prev.queue.pop();
var open = node.parent.open;
var close = node.val;
if (open && close && isOptimized(node, options)) {
open = '(';
close = ')';
}
// if a close brace exists, and the previous segment is one character
// don't wrap the result in braces or parens
var ele = utils.last(queue);
if (node.parent.count > 1 && options.expand) {
ele = multiply(queue.pop(), node.parent.count);
node.parent.count = 1;
queue.push(ele);
}
if (close && typeof ele === 'string' && ele.length === 1) {
open = '';
close = '';
}
if ((isLiteralBrace(node, options) || noInner(node)) && !node.parent.hasEmpty) {
queue.push(utils.join(open, queue.pop() || ''));
queue = utils.flatten(utils.join(queue, close));
}
if (typeof last === 'undefined') {
prev.queue = [queue];
} else {
prev.queue.push(utils.flatten(utils.join(last, queue)));
}
})
/**
* eos
*/
.set('eos', function(node) {
if (this.input) return;
if (options.optimize !== false) {
this.output = utils.last(utils.flatten(this.ast.queue));
} else if (Array.isArray(utils.last(this.ast.queue))) {
this.output = utils.flatten(this.ast.queue.pop());
} else {
this.output = utils.flatten(this.ast.queue);
}
if (node.parent.count > 1 && options.expand) {
this.output = multiply(this.output, node.parent.count);
}
this.output = utils.arrayify(this.output);
this.ast.queue = [];
});
};
/**
* Multiply the segments in the current brace level
*/
function multiply(queue, n, options) {
return utils.flatten(utils.repeat(utils.arrayify(queue), n));
}
/**
* Return true if `node` is escaped
*/
function isEscaped(node) {
return node.escaped === true;
}
/**
* Returns true if regex parens should be used for sets. If the parent `type`
* is not `brace`, then we're on a root node, which means we should never
* expand segments and open/close braces should be `{}` (since this indicates
* a brace is missing from the set)
*/
function isOptimized(node, options) {
if (node.parent.isOptimized) return true;
return isType(node.parent, 'brace')
&& !isEscaped(node.parent)
&& options.expand !== true;
}
/**
* Returns true if the value in `node` should be wrapped in a literal brace.
* @return {Boolean}
*/
function isLiteralBrace(node, options) {
return isEscaped(node.parent) || options.optimize !== false;
}
/**
* Returns true if the given `node` does not have an inner value.
* @return {Boolean}
*/
function noInner(node, type) {
if (node.parent.queue.length === 1) {
return true;
}
var nodes = node.parent.nodes;
return nodes.length === 3
&& isType(nodes[0], 'brace.open')
&& !isType(nodes[1], 'text')
&& isType(nodes[2], 'brace.close');
}
/**
* Returns true if the given `node` is the given `type`
* @return {Boolean}
*/
function isType(node, type) {
return typeof node !== 'undefined' && node.type === type;
}
/**
* Returns true if the given `node` has a non-empty queue.
* @return {Boolean}
*/
function hasQueue(node) {
return Array.isArray(node.queue) && node.queue.length;
}