hexo/node_modules/stylus/lib/visitor/deps-resolver.js

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2023-10-03 11:14:36 +08:00
/**
* Module dependencies.
*/
var Visitor = require('./')
, Parser = require('../parser')
, nodes = require('../nodes')
, utils = require('../utils')
, dirname = require('path').dirname
, fs = require('fs');
/**
* Initialize a new `DepsResolver` with the given `root` Node
* and the `options`.
*
* @param {Node} root
* @param {Object} options
* @api private
*/
var DepsResolver = module.exports = function DepsResolver(root, options) {
this.root = root;
this.filename = options.filename;
this.paths = options.paths || [];
this.paths.push(dirname(options.filename || '.'));
this.options = options;
this.functions = {};
this.deps = [];
};
/**
* Inherit from `Visitor.prototype`.
*/
DepsResolver.prototype.__proto__ = Visitor.prototype;
var visit = DepsResolver.prototype.visit;
DepsResolver.prototype.visit = function(node) {
switch (node.nodeName) {
case 'root':
case 'block':
case 'expression':
this.visitRoot(node);
break;
case 'group':
case 'media':
case 'atblock':
case 'atrule':
case 'keyframes':
case 'each':
case 'supports':
this.visit(node.block);
break;
default:
visit.call(this, node);
}
};
/**
* Visit Root.
*/
DepsResolver.prototype.visitRoot = function(block) {
for (var i = 0, len = block.nodes.length; i < len; ++i) {
this.visit(block.nodes[i]);
}
};
/**
* Visit Ident.
*/
DepsResolver.prototype.visitIdent = function(ident) {
this.visit(ident.val);
};
/**
* Visit If.
*/
DepsResolver.prototype.visitIf = function(node) {
this.visit(node.block);
this.visit(node.cond);
for (var i = 0, len = node.elses.length; i < len; ++i) {
this.visit(node.elses[i]);
}
};
/**
* Visit Function.
*/
DepsResolver.prototype.visitFunction = function(fn) {
this.functions[fn.name] = fn.block;
};
/**
* Visit Call.
*/
DepsResolver.prototype.visitCall = function(call) {
if (call.name in this.functions) this.visit(this.functions[call.name]);
if (call.block) this.visit(call.block);
};
/**
* Visit Import.
*/
DepsResolver.prototype.visitImport = function(node) {
// If it's a url() call, skip
if (node.path.first.name === 'url') return;
var path = !node.path.first.val.isNull && node.path.first.val || node.path.first.name
, literal, found, oldPath;
if (!path) return;
literal = /\.css(?:"|$)/.test(path);
// support optional .styl
if (!literal && !/\.styl$/i.test(path)) {
oldPath = path;
path += '.styl';
}
// Lookup
found = utils.find(path, this.paths, this.filename);
// support optional index
if (!found && oldPath) found = utils.lookupIndex(oldPath, this.paths, this.filename);
if (!found) return;
this.deps = this.deps.concat(found);
if (literal) return;
// nested imports
for (var i = 0, len = found.length; i < len; ++i) {
var file = found[i]
, dir = dirname(file)
, str = fs.readFileSync(file, 'utf-8')
, block = new nodes.Block
, parser = new Parser(str, utils.merge({ root: block }, this.options));
if (!~this.paths.indexOf(dir)) this.paths.push(dir);
try {
block = parser.parse();
} catch (err) {
err.filename = file;
err.lineno = parser.lexer.lineno;
err.column = parser.lexer.column;
err.input = str;
throw err;
}
this.visit(block);
}
};
/**
* Get dependencies.
*/
DepsResolver.prototype.resolve = function() {
this.visit(this.root);
return utils.uniq(this.deps);
};