mirror of https://github.com/jkjoy/sunpeiwen.git
525 lines
12 KiB
JavaScript
525 lines
12 KiB
JavaScript
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/*!
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* Stylus - utils
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* Copyright (c) Automattic <developer.wordpress.com>
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* MIT Licensed
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*/
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/**
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* Module dependencies.
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*/
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var nodes = require('./nodes')
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, basename = require('path').basename
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, relative = require('path').relative
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, join = require('path').join
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, isAbsolute = require('path').isAbsolute
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, glob = require('glob')
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, fs = require('fs');
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/**
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* Check if `path` looks absolute.
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*
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* @param {String} path
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* @return {Boolean}
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* @api private
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*/
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exports.absolute = isAbsolute || function(path){
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// On Windows the path could start with a drive letter, i.e. a:\\ or two leading backslashes.
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// Also on Windows, the path may have been normalized to forward slashes, so check for this too.
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return path.substr(0, 2) == '\\\\' || '/' === path.charAt(0) || /^[a-z]:[\\\/]/i.test(path);
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};
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/**
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* Attempt to lookup `path` within `paths` from tail to head.
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* Optionally a path to `ignore` may be passed.
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*
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* @param {String} path
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* @param {String} paths
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* @param {String} ignore
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* @return {String}
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* @api private
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*/
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exports.lookup = function(path, paths, ignore){
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var lookup
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, i = paths.length;
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// Absolute
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if (exports.absolute(path)) {
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try {
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fs.statSync(path);
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return path;
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} catch (err) {
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// Ignore, continue on
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// to trying relative lookup.
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// Needed for url(/images/foo.png)
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// for example
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}
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}
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// Relative
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while (i--) {
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try {
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lookup = join(paths[i], path);
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if (ignore == lookup) continue;
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fs.statSync(lookup);
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return lookup;
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} catch (err) {
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// Ignore
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}
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}
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};
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/**
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* Like `utils.lookup` but uses `glob` to find files.
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*
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* @param {String} path
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* @param {String} paths
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* @param {String} ignore
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* @return {Array}
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* @api private
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*/
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exports.find = function(path, paths, ignore) {
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var lookup
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, found
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, i = paths.length;
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// Absolute
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if (exports.absolute(path)) {
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if ((found = glob.sync(path)).length) {
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return found;
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}
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}
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// Relative
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while (i--) {
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lookup = join(paths[i], path);
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if (ignore == lookup) continue;
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if ((found = glob.sync(lookup)).length) {
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return found;
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}
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}
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};
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/**
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* Lookup index file inside dir with given `name`.
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*
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* @param {String} name
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* @return {Array}
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* @api private
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*/
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exports.lookupIndex = function(name, paths, filename){
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// foo/index.styl
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var found = exports.find(join(name, 'index.styl'), paths, filename);
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if (!found) {
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// foo/foo.styl
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found = exports.find(join(name, basename(name).replace(/\.styl/i, '') + '.styl'), paths, filename);
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}
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if (!found && !~name.indexOf('node_modules')) {
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// node_modules/foo/.. or node_modules/foo.styl/..
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found = lookupPackage(join('node_modules', name));
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}
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return found;
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function lookupPackage(dir) {
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var pkg = exports.lookup(join(dir, 'package.json'), paths, filename);
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if (!pkg) {
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return /\.styl$/i.test(dir) ? exports.lookupIndex(dir, paths, filename) : lookupPackage(dir + '.styl');
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}
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var main = require(relative(__dirname, pkg)).main;
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if (main) {
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found = exports.find(join(dir, main), paths, filename);
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} else {
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found = exports.lookupIndex(dir, paths, filename);
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}
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return found;
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}
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};
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/**
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* Format the given `err` with the given `options`.
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*
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* Options:
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*
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* - `filename` context filename
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* - `context` context line count [8]
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* - `lineno` context line number
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* - `column` context column number
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* - `input` input string
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*
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* @param {Error} err
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* @param {Object} options
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* @return {Error}
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* @api private
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*/
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exports.formatException = function(err, options){
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var lineno = options.lineno
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, column = options.column
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, filename = options.filename
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, str = options.input
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, context = options.context || 8
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, context = context / 2
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, lines = ('\n' + str).split('\n')
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, start = Math.max(lineno - context, 1)
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, end = Math.min(lines.length, lineno + context)
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, pad = end.toString().length;
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var context = lines.slice(start, end).map(function(line, i){
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var curr = i + start;
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return ' '
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+ Array(pad - curr.toString().length + 1).join(' ')
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+ curr
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+ '| '
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+ line
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+ (curr == lineno
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? '\n' + Array(curr.toString().length + 5 + column).join('-') + '^'
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: '');
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}).join('\n');
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err.message = filename
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+ ':' + lineno
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+ ':' + column
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+ '\n' + context
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+ '\n\n' + err.message + '\n'
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+ (err.stylusStack ? err.stylusStack + '\n' : '');
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// Don't show JS stack trace for Stylus errors
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if (err.fromStylus) err.stack = 'Error: ' + err.message;
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return err;
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};
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/**
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* Assert that `node` is of the given `type`, or throw.
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*
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* @param {Node} node
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* @param {Function} type
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* @param {String} param
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* @api public
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*/
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exports.assertType = function(node, type, param){
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exports.assertPresent(node, param);
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if (node.nodeName == type) return;
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var actual = node.nodeName
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, msg = 'expected '
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+ (param ? '"' + param + '" to be a ' : '')
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+ type + ', but got '
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+ actual + ':' + node;
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throw new Error('TypeError: ' + msg);
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};
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/**
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* Assert that `node` is a `String` or `Ident`.
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*
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* @param {Node} node
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* @param {String} param
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* @api public
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*/
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exports.assertString = function(node, param){
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exports.assertPresent(node, param);
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switch (node.nodeName) {
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case 'string':
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case 'ident':
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case 'literal':
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return;
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default:
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var actual = node.nodeName
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, msg = 'expected string, ident or literal, but got ' + actual + ':' + node;
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throw new Error('TypeError: ' + msg);
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}
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};
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/**
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* Assert that `node` is a `RGBA` or `HSLA`.
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*
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* @param {Node} node
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* @param {String} param
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* @api public
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*/
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exports.assertColor = function(node, param){
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exports.assertPresent(node, param);
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switch (node.nodeName) {
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case 'rgba':
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case 'hsla':
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return;
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default:
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var actual = node.nodeName
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, msg = 'expected rgba or hsla, but got ' + actual + ':' + node;
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throw new Error('TypeError: ' + msg);
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}
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};
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/**
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* Assert that param `name` is given, aka the `node` is passed.
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*
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* @param {Node} node
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* @param {String} name
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* @api public
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*/
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exports.assertPresent = function(node, name){
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if (node) return;
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if (name) throw new Error('"' + name + '" argument required');
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throw new Error('argument missing');
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};
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/**
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* Unwrap `expr`.
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*
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* Takes an expressions with length of 1
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* such as `((1 2 3))` and unwraps it to `(1 2 3)`.
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*
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* @param {Expression} expr
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* @return {Node}
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* @api public
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*/
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exports.unwrap = function(expr){
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// explicitly preserve the expression
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if (expr.preserve) return expr;
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if ('arguments' != expr.nodeName && 'expression' != expr.nodeName) return expr;
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if (1 != expr.nodes.length) return expr;
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if ('arguments' != expr.nodes[0].nodeName && 'expression' != expr.nodes[0].nodeName) return expr;
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return exports.unwrap(expr.nodes[0]);
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};
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/**
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* Coerce JavaScript values to their Stylus equivalents.
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*
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* @param {Mixed} val
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* @param {Boolean} [raw]
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* @return {Node}
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* @api public
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*/
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exports.coerce = function(val, raw){
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switch (typeof val) {
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case 'function':
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return val;
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case 'string':
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return new nodes.String(val);
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case 'boolean':
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return new nodes.Boolean(val);
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case 'number':
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return new nodes.Unit(val);
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default:
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if (null == val) return nodes.null;
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if (Array.isArray(val)) return exports.coerceArray(val, raw);
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if (val.nodeName) return val;
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return exports.coerceObject(val, raw);
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}
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};
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/**
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* Coerce a javascript `Array` to a Stylus `Expression`.
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*
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* @param {Array} val
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* @param {Boolean} [raw]
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* @return {Expression}
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* @api private
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*/
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exports.coerceArray = function(val, raw){
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var expr = new nodes.Expression;
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val.forEach(function(val){
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expr.push(exports.coerce(val, raw));
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});
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return expr;
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};
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/**
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* Coerce a javascript object to a Stylus `Expression` or `Object`.
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*
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* For example `{ foo: 'bar', bar: 'baz' }` would become
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* the expression `(foo 'bar') (bar 'baz')`. If `raw` is true
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* given `obj` would become a Stylus hash object.
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*
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* @param {Object} obj
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* @param {Boolean} [raw]
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* @return {Expression|Object}
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* @api public
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*/
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exports.coerceObject = function(obj, raw){
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var node = raw ? new nodes.Object : new nodes.Expression
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, val;
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for (var key in obj) {
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val = exports.coerce(obj[key], raw);
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key = new nodes.Ident(key);
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if (raw) {
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node.set(key, val);
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} else {
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node.push(exports.coerceArray([key, val]));
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}
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}
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return node;
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};
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/**
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* Return param names for `fn`.
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*
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* @param {Function} fn
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* @return {Array}
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* @api private
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*/
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exports.params = function(fn){
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return fn
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.toString()
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.match(/\(([^)]*)\)/)[1].split(/ *, */);
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};
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/**
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* Merge object `b` with `a`.
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*
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* @param {Object} a
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* @param {Object} b
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* @param {Boolean} [deep]
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* @return {Object} a
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* @api private
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*/
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exports.merge = function(a, b, deep) {
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for (var k in b) {
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if (deep && a[k]) {
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var nodeA = exports.unwrap(a[k]).first
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, nodeB = exports.unwrap(b[k]).first;
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if ('object' == nodeA.nodeName && 'object' == nodeB.nodeName) {
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a[k].first.vals = exports.merge(nodeA.vals, nodeB.vals, deep);
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} else {
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a[k] = b[k];
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}
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} else {
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a[k] = b[k];
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}
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}
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return a;
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};
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/**
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* Returns an array with unique values.
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*
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* @param {Array} arr
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* @return {Array}
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* @api private
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*/
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exports.uniq = function(arr){
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var obj = {}
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, ret = [];
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for (var i = 0, len = arr.length; i < len; ++i) {
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if (arr[i] in obj) continue;
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obj[arr[i]] = true;
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ret.push(arr[i]);
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}
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return ret;
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};
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/**
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* Compile selector strings in `arr` from the bottom-up
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* to produce the selector combinations. For example
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* the following Stylus:
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*
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* ul
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* li
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* p
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* a
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* color: red
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*
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* Would return:
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*
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* [ 'ul li a', 'ul p a' ]
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*
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* @param {Array} arr
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* @param {Boolean} leaveHidden
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* @return {Array}
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* @api private
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*/
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exports.compileSelectors = function(arr, leaveHidden){
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var selectors = []
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, Parser = require('./selector-parser')
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, indent = (this.indent || '')
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, buf = [];
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function parse(selector, buf) {
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var parts = [selector.val]
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, str = new Parser(parts[0], parents, parts).parse().val
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, parents = [];
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if (buf.length) {
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for (var i = 0, len = buf.length; i < len; ++i) {
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parts.push(buf[i]);
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parents.push(str);
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var child = new Parser(buf[i], parents, parts).parse();
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if (child.nested) {
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str += ' ' + child.val;
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} else {
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str = child.val;
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}
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}
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}
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return str.trim();
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}
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function compile(arr, i) {
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if (i) {
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arr[i].forEach(function(selector){
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if (!leaveHidden && selector.isPlaceholder) return;
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if (selector.inherits) {
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buf.unshift(selector.val);
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compile(arr, i - 1);
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buf.shift();
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} else {
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selectors.push(indent + parse(selector, buf));
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}
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});
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} else {
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arr[0].forEach(function(selector){
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if (!leaveHidden && selector.isPlaceholder) return;
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var str = parse(selector, buf);
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if (str) selectors.push(indent + str);
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});
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}
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}
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compile(arr, arr.length - 1);
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// Return the list with unique selectors only
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return exports.uniq(selectors);
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};
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/**
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* Attempt to parse string.
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*
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* @param {String} str
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* @return {Node}
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* @api private
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*/
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exports.parseString = function(str){
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var Parser = require('./parser')
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, parser
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, ret;
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try {
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parser = new Parser(str);
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ret = parser.list();
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} catch (e) {
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ret = new nodes.Literal(str);
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}
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return ret;
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};
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