361 lines
7.8 KiB
JavaScript
361 lines
7.8 KiB
JavaScript
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'use strict';
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var Node = require('snapdragon-node');
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var utils = require('./utils');
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/**
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* Braces parsers
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*/
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module.exports = function(braces, options) {
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braces.parser
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.set('bos', function() {
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if (!this.parsed) {
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this.ast = this.nodes[0] = new Node(this.ast);
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}
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})
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/**
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* Character parsers
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*/
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.set('escape', function() {
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var pos = this.position();
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var m = this.match(/^(?:\\(.)|\$\{)/);
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if (!m) return;
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var prev = this.prev();
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var last = utils.last(prev.nodes);
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var node = pos(new Node({
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type: 'text',
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multiplier: 1,
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val: m[0]
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}));
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if (node.val === '\\\\') {
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return node;
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}
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if (node.val === '${') {
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var str = this.input;
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var idx = -1;
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var ch;
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while ((ch = str[++idx])) {
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this.consume(1);
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node.val += ch;
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if (ch === '\\') {
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node.val += str[++idx];
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continue;
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}
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if (ch === '}') {
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break;
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}
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}
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}
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if (this.options.unescape !== false) {
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node.val = node.val.replace(/\\([{}])/g, '$1');
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}
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if (last.val === '"' && this.input.charAt(0) === '"') {
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last.val = node.val;
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this.consume(1);
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return;
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}
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return concatNodes.call(this, pos, node, prev, options);
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})
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/**
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* Brackets: "[...]" (basic, this is overridden by
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* other parsers in more advanced implementations)
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*/
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.set('bracket', function() {
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var isInside = this.isInside('brace');
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var pos = this.position();
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var m = this.match(/^(?:\[([!^]?)([^\]]{2,}|\]-)(\]|[^*+?]+)|\[)/);
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if (!m) return;
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var prev = this.prev();
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var val = m[0];
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var negated = m[1] ? '^' : '';
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var inner = m[2] || '';
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var close = m[3] || '';
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if (isInside && prev.type === 'brace') {
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prev.text = prev.text || '';
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prev.text += val;
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}
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var esc = this.input.slice(0, 2);
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if (inner === '' && esc === '\\]') {
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inner += esc;
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this.consume(2);
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var str = this.input;
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var idx = -1;
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var ch;
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while ((ch = str[++idx])) {
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this.consume(1);
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if (ch === ']') {
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close = ch;
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break;
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}
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inner += ch;
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}
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}
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return pos(new Node({
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type: 'bracket',
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val: val,
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escaped: close !== ']',
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negated: negated,
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inner: inner,
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close: close
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}));
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})
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/**
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* Empty braces (we capture these early to
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* speed up processing in the compiler)
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*/
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.set('multiplier', function() {
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var isInside = this.isInside('brace');
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var pos = this.position();
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var m = this.match(/^\{((?:,|\{,+\})+)\}/);
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if (!m) return;
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this.multiplier = true;
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var prev = this.prev();
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var val = m[0];
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if (isInside && prev.type === 'brace') {
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prev.text = prev.text || '';
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prev.text += val;
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}
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var node = pos(new Node({
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type: 'text',
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multiplier: 1,
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match: m,
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val: val
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}));
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return concatNodes.call(this, pos, node, prev, options);
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})
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/**
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* Open
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*/
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.set('brace.open', function() {
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var pos = this.position();
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var m = this.match(/^\{(?!(?:[^\\}]?|,+)\})/);
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if (!m) return;
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var prev = this.prev();
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var last = utils.last(prev.nodes);
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// if the last parsed character was an extglob character
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// we need to _not optimize_ the brace pattern because
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// it might be mistaken for an extglob by a downstream parser
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if (last && last.val && isExtglobChar(last.val.slice(-1))) {
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last.optimize = false;
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}
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var open = pos(new Node({
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type: 'brace.open',
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val: m[0]
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}));
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var node = pos(new Node({
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type: 'brace',
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nodes: []
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}));
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node.push(open);
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prev.push(node);
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this.push('brace', node);
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})
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/**
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* Close
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*/
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.set('brace.close', function() {
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var pos = this.position();
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var m = this.match(/^\}/);
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if (!m || !m[0]) return;
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var brace = this.pop('brace');
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var node = pos(new Node({
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type: 'brace.close',
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val: m[0]
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}));
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if (!this.isType(brace, 'brace')) {
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if (this.options.strict) {
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throw new Error('missing opening "{"');
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}
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node.type = 'text';
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node.multiplier = 0;
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node.escaped = true;
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return node;
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}
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var prev = this.prev();
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var last = utils.last(prev.nodes);
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if (last.text) {
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var lastNode = utils.last(last.nodes);
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if (lastNode.val === ')' && /[!@*?+]\(/.test(last.text)) {
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var open = last.nodes[0];
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var text = last.nodes[1];
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if (open.type === 'brace.open' && text && text.type === 'text') {
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text.optimize = false;
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}
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}
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}
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if (brace.nodes.length > 2) {
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var first = brace.nodes[1];
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if (first.type === 'text' && first.val === ',') {
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brace.nodes.splice(1, 1);
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brace.nodes.push(first);
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}
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}
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brace.push(node);
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})
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/**
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* Capture boundary characters
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*/
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.set('boundary', function() {
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var pos = this.position();
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var m = this.match(/^[$^](?!\{)/);
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if (!m) return;
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return pos(new Node({
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type: 'text',
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val: m[0]
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}));
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})
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/**
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* One or zero, non-comma characters wrapped in braces
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*/
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.set('nobrace', function() {
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var isInside = this.isInside('brace');
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var pos = this.position();
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var m = this.match(/^\{[^,]?\}/);
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if (!m) return;
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var prev = this.prev();
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var val = m[0];
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if (isInside && prev.type === 'brace') {
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prev.text = prev.text || '';
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prev.text += val;
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}
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return pos(new Node({
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type: 'text',
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multiplier: 0,
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val: val
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}));
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})
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/**
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* Text
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*/
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.set('text', function() {
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var isInside = this.isInside('brace');
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var pos = this.position();
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var m = this.match(/^((?!\\)[^${}[\]])+/);
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if (!m) return;
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var prev = this.prev();
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var val = m[0];
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if (isInside && prev.type === 'brace') {
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prev.text = prev.text || '';
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prev.text += val;
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}
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var node = pos(new Node({
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type: 'text',
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multiplier: 1,
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val: val
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}));
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return concatNodes.call(this, pos, node, prev, options);
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});
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};
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/**
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* Returns true if the character is an extglob character.
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*/
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function isExtglobChar(ch) {
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return ch === '!' || ch === '@' || ch === '*' || ch === '?' || ch === '+';
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}
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/**
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* Combine text nodes, and calculate empty sets (`{,,}`)
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* @param {Function} `pos` Function to calculate node position
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* @param {Object} `node` AST node
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* @return {Object}
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*/
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function concatNodes(pos, node, parent, options) {
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node.orig = node.val;
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var prev = this.prev();
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var last = utils.last(prev.nodes);
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var isEscaped = false;
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if (node.val.length > 1) {
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var a = node.val.charAt(0);
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var b = node.val.slice(-1);
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isEscaped = (a === '"' && b === '"')
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|| (a === "'" && b === "'")
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|| (a === '`' && b === '`');
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}
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if (isEscaped && options.unescape !== false) {
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node.val = node.val.slice(1, node.val.length - 1);
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node.escaped = true;
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}
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if (node.match) {
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var match = node.match[1];
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if (!match || match.indexOf('}') === -1) {
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match = node.match[0];
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}
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// replace each set with a single ","
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var val = match.replace(/\{/g, ',').replace(/\}/g, '');
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node.multiplier *= val.length;
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node.val = '';
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}
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var simpleText = last.type === 'text'
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&& last.multiplier === 1
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&& node.multiplier === 1
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&& node.val;
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if (simpleText) {
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last.val += node.val;
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return;
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}
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prev.push(node);
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}
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