[6a3a178] | 1 |
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| 2 | /*!
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| 3 | * Stylus - Evaluator
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| 4 | * Copyright (c) Automattic <developer.wordpress.com>
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| 5 | * MIT Licensed
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| 6 | */
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| 7 |
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| 8 | /**
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| 9 | * Module dependencies.
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| 10 | */
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| 11 |
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| 12 | var Visitor = require('./')
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| 13 | , units = require('../units')
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| 14 | , nodes = require('../nodes')
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| 15 | , Stack = require('../stack')
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| 16 | , Frame = require('../stack/frame')
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| 17 | , utils = require('../utils')
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| 18 | , bifs = require('../functions')
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| 19 | , dirname = require('path').dirname
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| 20 | , colors = require('../colors')
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| 21 | , debug = require('debug')('stylus:evaluator')
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| 22 | , fs = require('fs');
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| 23 |
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| 24 | /**
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| 25 | * Import `file` and return Block node.
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| 26 | *
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| 27 | * @api private
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| 28 | */
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| 29 | function importFile(node, file, literal) {
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| 30 | var importStack = this.importStack
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| 31 | , Parser = require('../parser')
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| 32 | , stat;
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| 33 |
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| 34 | // Handling the `require`
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| 35 | if (node.once) {
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| 36 | if (this.requireHistory[file]) return nodes.null;
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| 37 | this.requireHistory[file] = true;
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| 38 |
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| 39 | if (literal && !this.includeCSS) {
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| 40 | return node;
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| 41 | }
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| 42 | }
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| 43 |
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| 44 | // Avoid overflows from importing the same file over again
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| 45 | if (~importStack.indexOf(file))
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| 46 | throw new Error('import loop has been found');
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| 47 |
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| 48 | var str = fs.readFileSync(file, 'utf8');
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| 49 |
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| 50 | // shortcut for empty files
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| 51 | if (!str.trim()) return nodes.null;
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| 52 |
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| 53 | // Expose imports
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| 54 | node.path = file;
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| 55 | node.dirname = dirname(file);
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| 56 | // Store the modified time
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| 57 | stat = fs.statSync(file);
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| 58 | node.mtime = stat.mtime;
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| 59 | this.paths.push(node.dirname);
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| 60 |
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| 61 | if (this.options._imports) this.options._imports.push(node.clone());
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| 62 |
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| 63 | // Parse the file
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| 64 | importStack.push(file);
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| 65 | nodes.filename = file;
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| 66 |
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| 67 | if (literal) {
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| 68 | literal = new nodes.Literal(str.replace(/\r\n?/g, '\n'));
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| 69 | literal.lineno = literal.column = 1;
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| 70 | if (!this.resolveURL) return literal;
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| 71 | }
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| 72 |
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| 73 | // parse
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| 74 | var block = new nodes.Block
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| 75 | , parser = new Parser(str, utils.merge({ root: block }, this.options));
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| 76 |
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| 77 | try {
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| 78 | block = parser.parse();
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| 79 | } catch (err) {
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| 80 | var line = parser.lexer.lineno
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| 81 | , column = parser.lexer.column;
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| 82 |
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| 83 | if (literal && this.includeCSS && this.resolveURL) {
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| 84 | this.warn('ParseError: ' + file + ':' + line + ':' + column + '. This file included as-is');
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| 85 | return literal;
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| 86 | } else {
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| 87 | err.filename = file;
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| 88 | err.lineno = line;
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| 89 | err.column = column;
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| 90 | err.input = str;
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| 91 | throw err;
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| 92 | }
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| 93 | }
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| 94 |
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| 95 | // Evaluate imported "root"
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| 96 | block = block.clone(this.currentBlock);
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| 97 | block.parent = this.currentBlock;
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| 98 | block.scope = false;
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| 99 | var ret = this.visit(block);
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| 100 | importStack.pop();
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| 101 | if (!this.resolveURL || this.resolveURL.nocheck) this.paths.pop();
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| 102 |
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| 103 | return ret;
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| 104 | }
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| 105 |
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| 106 | /**
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| 107 | * Initialize a new `Evaluator` with the given `root` Node
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| 108 | * and the following `options`.
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| 109 | *
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| 110 | * Options:
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| 111 | *
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| 112 | * - `compress` Compress the css output, defaults to false
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| 113 | * - `warn` Warn the user of duplicate function definitions etc
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| 114 | *
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| 115 | * @param {Node} root
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| 116 | * @api private
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| 117 | */
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| 118 |
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| 119 | var Evaluator = module.exports = function Evaluator(root, options) {
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| 120 | options = options || {};
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| 121 | Visitor.call(this, root);
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| 122 | var functions = this.functions = options.functions || {};
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| 123 | this.stack = new Stack;
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| 124 | this.imports = options.imports || [];
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| 125 | this.globals = options.globals || {};
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| 126 | this.paths = options.paths || [];
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| 127 | this.prefix = options.prefix || '';
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| 128 | this.filename = options.filename;
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| 129 | this.includeCSS = options['include css'];
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| 130 | this.resolveURL = functions.url
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| 131 | && 'resolver' == functions.url.name
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| 132 | && functions.url.options;
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| 133 | this.paths.push(dirname(options.filename || '.'));
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| 134 | this.stack.push(this.global = new Frame(root));
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| 135 | this.warnings = options.warn;
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| 136 | this.options = options;
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| 137 | this.calling = []; // TODO: remove, use stack
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| 138 | this.importStack = [];
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| 139 | this.requireHistory = {};
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| 140 | this.return = 0;
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| 141 | };
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| 142 |
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| 143 | /**
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| 144 | * Inherit from `Visitor.prototype`.
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| 145 | */
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| 146 |
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| 147 | Evaluator.prototype.__proto__ = Visitor.prototype;
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| 148 |
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| 149 | /**
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| 150 | * Proxy visit to expose node line numbers.
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| 151 | *
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| 152 | * @param {Node} node
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| 153 | * @return {Node}
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| 154 | * @api private
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| 155 | */
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| 156 |
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| 157 | var visit = Visitor.prototype.visit;
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| 158 | Evaluator.prototype.visit = function(node){
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| 159 | try {
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| 160 | return visit.call(this, node);
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| 161 | } catch (err) {
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| 162 | if (err.filename) throw err;
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| 163 | err.lineno = node.lineno;
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| 164 | err.column = node.column;
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| 165 | err.filename = node.filename;
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| 166 | err.stylusStack = this.stack.toString();
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| 167 | try {
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| 168 | err.input = fs.readFileSync(err.filename, 'utf8');
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| 169 | } catch (err) {
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| 170 | // ignore
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| 171 | }
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| 172 | throw err;
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| 173 | }
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| 174 | };
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| 175 |
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| 176 | /**
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| 177 | * Perform evaluation setup:
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| 178 | *
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| 179 | * - populate global scope
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| 180 | * - iterate imports
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| 181 | *
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| 182 | * @api private
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| 183 | */
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| 184 |
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| 185 | Evaluator.prototype.setup = function(){
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| 186 | var root = this.root;
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| 187 | var imports = [];
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| 188 |
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| 189 | this.populateGlobalScope();
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| 190 | this.imports.forEach(function(file){
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| 191 | var expr = new nodes.Expression;
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| 192 | expr.push(new nodes.String(file));
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| 193 | imports.push(new nodes.Import(expr));
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| 194 | }, this);
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| 195 |
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| 196 | root.nodes = imports.concat(root.nodes);
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| 197 | };
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| 198 |
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| 199 | /**
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| 200 | * Populate the global scope with:
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| 201 | *
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| 202 | * - css colors
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| 203 | * - user-defined globals
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| 204 | *
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| 205 | * @api private
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| 206 | */
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| 207 |
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| 208 | Evaluator.prototype.populateGlobalScope = function(){
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| 209 | var scope = this.global.scope;
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| 210 |
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| 211 | // colors
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| 212 | Object.keys(colors).forEach(function(name){
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| 213 | var color = colors[name]
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| 214 | , rgba = new nodes.RGBA(color[0], color[1], color[2], color[3])
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| 215 | , node = new nodes.Ident(name, rgba);
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| 216 | rgba.name = name;
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| 217 | scope.add(node);
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| 218 | });
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| 219 |
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| 220 | // expose url function
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| 221 | scope.add(new nodes.Ident(
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| 222 | 'embedurl',
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| 223 | new nodes.Function('embedurl', require('../functions/url')({
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| 224 | limit: false
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| 225 | }))
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| 226 | ));
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| 227 |
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| 228 | // user-defined globals
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| 229 | var globals = this.globals;
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| 230 | Object.keys(globals).forEach(function(name){
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| 231 | var val = globals[name];
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| 232 | if (!val.nodeName) val = new nodes.Literal(val);
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| 233 | scope.add(new nodes.Ident(name, val));
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| 234 | });
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| 235 | };
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| 236 |
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| 237 | /**
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| 238 | * Evaluate the tree.
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| 239 | *
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| 240 | * @return {Node}
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| 241 | * @api private
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| 242 | */
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| 243 |
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| 244 | Evaluator.prototype.evaluate = function(){
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| 245 | debug('eval %s', this.filename);
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| 246 | this.setup();
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| 247 | return this.visit(this.root);
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| 248 | };
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| 249 |
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| 250 | /**
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| 251 | * Visit Group.
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| 252 | */
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| 253 |
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| 254 | Evaluator.prototype.visitGroup = function(group){
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| 255 | group.nodes = group.nodes.map(function(selector){
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| 256 | selector.val = this.interpolate(selector);
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| 257 | debug('ruleset %s', selector.val);
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| 258 | return selector;
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| 259 | }, this);
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| 260 |
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| 261 | group.block = this.visit(group.block);
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| 262 | return group;
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| 263 | };
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| 264 |
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| 265 | /**
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| 266 | * Visit Return.
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| 267 | */
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| 268 |
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| 269 | Evaluator.prototype.visitReturn = function(ret){
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| 270 | ret.expr = this.visit(ret.expr);
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| 271 | throw ret;
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| 272 | };
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| 273 |
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| 274 | /**
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| 275 | * Visit Media.
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| 276 | */
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| 277 |
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| 278 | Evaluator.prototype.visitMedia = function(media){
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| 279 | media.block = this.visit(media.block);
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| 280 | media.val = this.visit(media.val);
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| 281 | return media;
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| 282 | };
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| 283 |
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| 284 | /**
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| 285 | * Visit QueryList.
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| 286 | */
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| 287 |
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| 288 | Evaluator.prototype.visitQueryList = function(queries){
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| 289 | var val, query;
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| 290 | queries.nodes.forEach(this.visit, this);
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| 291 |
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| 292 | if (1 == queries.nodes.length) {
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| 293 | query = queries.nodes[0];
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| 294 | if (val = this.lookup(query.type)) {
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| 295 | val = val.first.string;
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| 296 | if (!val) return queries;
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| 297 | var Parser = require('../parser')
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| 298 | , parser = new Parser(val, this.options);
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| 299 | queries = this.visit(parser.queries());
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| 300 | }
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| 301 | }
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| 302 | return queries;
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| 303 | };
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| 304 |
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| 305 | /**
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| 306 | * Visit Query.
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| 307 | */
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| 308 |
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| 309 | Evaluator.prototype.visitQuery = function(node){
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| 310 | node.predicate = this.visit(node.predicate);
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| 311 | node.type = this.visit(node.type);
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| 312 | node.nodes.forEach(this.visit, this);
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| 313 | return node;
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| 314 | };
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| 315 |
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| 316 | /**
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| 317 | * Visit Feature.
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| 318 | */
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| 319 |
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| 320 | Evaluator.prototype.visitFeature = function(node){
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| 321 | node.name = this.interpolate(node);
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| 322 | if (node.expr) {
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| 323 | this.return++;
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| 324 | node.expr = this.visit(node.expr);
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| 325 | this.return--;
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| 326 | }
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| 327 | return node;
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| 328 | };
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| 329 |
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| 330 | /**
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| 331 | * Visit Object.
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| 332 | */
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| 333 |
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| 334 | Evaluator.prototype.visitObject = function(obj){
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| 335 | for (var key in obj.vals) {
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| 336 | obj.vals[key] = this.visit(obj.vals[key]);
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| 337 | }
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| 338 | return obj;
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| 339 | };
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| 340 |
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| 341 | /**
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| 342 | * Visit Member.
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| 343 | */
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| 344 |
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| 345 | Evaluator.prototype.visitMember = function(node){
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| 346 | var left = node.left
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| 347 | , right = node.right
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| 348 | , obj = this.visit(left).first;
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| 349 |
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| 350 | if ('object' != obj.nodeName) {
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| 351 | throw new Error(left.toString() + ' has no property .' + right);
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| 352 | }
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| 353 | if (node.val) {
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| 354 | this.return++;
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| 355 | obj.set(right.name, this.visit(node.val));
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| 356 | this.return--;
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| 357 | }
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| 358 | return obj.get(right.name);
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| 359 | };
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| 360 |
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| 361 | /**
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| 362 | * Visit Keyframes.
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| 363 | */
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| 364 |
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| 365 | Evaluator.prototype.visitKeyframes = function(keyframes){
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| 366 | var val;
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| 367 | if (keyframes.fabricated) return keyframes;
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| 368 | keyframes.val = this.interpolate(keyframes).trim();
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| 369 | if (val = this.lookup(keyframes.val)) {
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| 370 | keyframes.val = val.first.string || val.first.name;
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| 371 | }
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| 372 | keyframes.block = this.visit(keyframes.block);
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| 373 |
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| 374 | if ('official' != keyframes.prefix) return keyframes;
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| 375 |
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| 376 | this.vendors.forEach(function(prefix){
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| 377 | // IE never had prefixes for keyframes
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| 378 | if ('ms' == prefix) return;
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| 379 | var node = keyframes.clone();
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| 380 | node.val = keyframes.val;
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| 381 | node.prefix = prefix;
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| 382 | node.block = keyframes.block;
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| 383 | node.fabricated = true;
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| 384 | this.currentBlock.push(node);
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| 385 | }, this);
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| 386 |
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| 387 | return nodes.null;
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| 388 | };
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| 389 |
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| 390 | /**
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| 391 | * Visit Function.
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| 392 | */
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| 393 |
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| 394 | Evaluator.prototype.visitFunction = function(fn){
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| 395 | // check local
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| 396 | var local = this.stack.currentFrame.scope.lookup(fn.name);
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| 397 | if (local) this.warn('local ' + local.nodeName + ' "' + fn.name + '" previously defined in this scope');
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| 398 |
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| 399 | // user-defined
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| 400 | var user = this.functions[fn.name];
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| 401 | if (user) this.warn('user-defined function "' + fn.name + '" is already defined');
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| 402 |
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| 403 | // BIF
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| 404 | var bif = bifs[fn.name];
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| 405 | if (bif) this.warn('built-in function "' + fn.name + '" is already defined');
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| 406 |
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| 407 | return fn;
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| 408 | };
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| 409 |
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| 410 | /**
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| 411 | * Visit Each.
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| 412 | */
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| 413 |
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| 414 | Evaluator.prototype.visitEach = function(each){
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| 415 | this.return++;
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| 416 | var expr = utils.unwrap(this.visit(each.expr))
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| 417 | , len = expr.nodes.length
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| 418 | , val = new nodes.Ident(each.val)
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| 419 | , key = new nodes.Ident(each.key || '__index__')
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| 420 | , scope = this.currentScope
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| 421 | , block = this.currentBlock
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| 422 | , vals = []
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| 423 | , self = this
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| 424 | , body
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| 425 | , obj;
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| 426 | this.return--;
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| 427 |
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| 428 | each.block.scope = false;
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| 429 |
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| 430 | function visitBody(key, val) {
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| 431 | scope.add(val);
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| 432 | scope.add(key);
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| 433 | body = self.visit(each.block.clone());
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| 434 | vals = vals.concat(body.nodes);
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| 435 | }
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| 436 |
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| 437 | // for prop in obj
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| 438 | if (1 == len && 'object' == expr.nodes[0].nodeName) {
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| 439 | obj = expr.nodes[0];
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| 440 | for (var prop in obj.vals) {
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| 441 | val.val = new nodes.String(prop);
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| 442 | key.val = obj.get(prop);
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| 443 | visitBody(key, val);
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| 444 | }
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| 445 | } else {
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| 446 | for (var i = 0; i < len; ++i) {
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| 447 | val.val = expr.nodes[i];
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| 448 | key.val = new nodes.Unit(i);
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| 449 | visitBody(key, val);
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| 450 | }
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| 451 | }
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| 452 |
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| 453 | this.mixin(vals, block);
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| 454 | return vals[vals.length - 1] || nodes.null;
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| 455 | };
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| 456 |
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| 457 | /**
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| 458 | * Visit Call.
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| 459 | */
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| 460 |
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| 461 | Evaluator.prototype.visitCall = function(call){
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| 462 | debug('call %s', call);
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| 463 | var fn = this.lookup(call.name)
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| 464 | , literal
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| 465 | , ret;
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| 466 |
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| 467 | // url()
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| 468 | this.ignoreColors = 'url' == call.name;
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| 469 |
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| 470 | // Variable function
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| 471 | if (fn && 'expression' == fn.nodeName) {
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| 472 | fn = fn.nodes[0];
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| 473 | }
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| 474 |
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| 475 | // Not a function? try user-defined or built-ins
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| 476 | if (fn && 'function' != fn.nodeName) {
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| 477 | fn = this.lookupFunction(call.name);
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| 478 | }
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| 479 |
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| 480 | // Undefined function? render literal CSS
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| 481 | if (!fn || fn.nodeName != 'function') {
|
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| 482 | debug('%s is undefined', call);
|
---|
| 483 | // Special case for `calc`
|
---|
| 484 | if ('calc' == this.unvendorize(call.name)) {
|
---|
| 485 | literal = call.args.nodes && call.args.nodes[0];
|
---|
| 486 | if (literal) ret = new nodes.Literal(call.name + literal);
|
---|
| 487 | } else {
|
---|
| 488 | ret = this.literalCall(call);
|
---|
| 489 | }
|
---|
| 490 | this.ignoreColors = false;
|
---|
| 491 | return ret;
|
---|
| 492 | }
|
---|
| 493 |
|
---|
| 494 | this.calling.push(call.name);
|
---|
| 495 |
|
---|
| 496 | // Massive stack
|
---|
| 497 | if (this.calling.length > 200) {
|
---|
| 498 | throw new RangeError('Maximum stylus call stack size exceeded');
|
---|
| 499 | }
|
---|
| 500 |
|
---|
| 501 | // First node in expression
|
---|
| 502 | if ('expression' == fn.nodeName) fn = fn.first;
|
---|
| 503 |
|
---|
| 504 | // Evaluate arguments
|
---|
| 505 | this.return++;
|
---|
| 506 | var args = this.visit(call.args);
|
---|
| 507 |
|
---|
| 508 | for (var key in args.map) {
|
---|
| 509 | args.map[key] = this.visit(args.map[key].clone());
|
---|
| 510 | }
|
---|
| 511 | this.return--;
|
---|
| 512 |
|
---|
| 513 | // Built-in
|
---|
| 514 | if (fn.fn) {
|
---|
| 515 | debug('%s is built-in', call);
|
---|
| 516 | ret = this.invokeBuiltin(fn.fn, args);
|
---|
| 517 | // User-defined
|
---|
| 518 | } else if ('function' == fn.nodeName) {
|
---|
| 519 | debug('%s is user-defined', call);
|
---|
| 520 | // Evaluate mixin block
|
---|
| 521 | if (call.block) call.block = this.visit(call.block);
|
---|
| 522 | ret = this.invokeFunction(fn, args, call.block);
|
---|
| 523 | }
|
---|
| 524 |
|
---|
| 525 | this.calling.pop();
|
---|
| 526 | this.ignoreColors = false;
|
---|
| 527 | return ret;
|
---|
| 528 | };
|
---|
| 529 |
|
---|
| 530 | /**
|
---|
| 531 | * Visit Ident.
|
---|
| 532 | */
|
---|
| 533 |
|
---|
| 534 | Evaluator.prototype.visitIdent = function(ident){
|
---|
| 535 | var prop;
|
---|
| 536 | // Property lookup
|
---|
| 537 | if (ident.property) {
|
---|
| 538 | if (prop = this.lookupProperty(ident.name)) {
|
---|
| 539 | return this.visit(prop.expr.clone());
|
---|
| 540 | }
|
---|
| 541 | return nodes.null;
|
---|
| 542 | // Lookup
|
---|
| 543 | } else if (ident.val.isNull) {
|
---|
| 544 | var val = this.lookup(ident.name);
|
---|
| 545 | // Object or Block mixin
|
---|
| 546 | if (val && ident.mixin) this.mixinNode(val);
|
---|
| 547 | return val ? this.visit(val) : ident;
|
---|
| 548 | // Assign
|
---|
| 549 | } else {
|
---|
| 550 | this.return++;
|
---|
| 551 | ident.val = this.visit(ident.val);
|
---|
| 552 | this.return--;
|
---|
| 553 | this.currentScope.add(ident);
|
---|
| 554 | return ident.val;
|
---|
| 555 | }
|
---|
| 556 | };
|
---|
| 557 |
|
---|
| 558 | /**
|
---|
| 559 | * Visit BinOp.
|
---|
| 560 | */
|
---|
| 561 |
|
---|
| 562 | Evaluator.prototype.visitBinOp = function(binop){
|
---|
| 563 | // Special-case "is defined" pseudo binop
|
---|
| 564 | if ('is defined' == binop.op) return this.isDefined(binop.left);
|
---|
| 565 |
|
---|
| 566 | this.return++;
|
---|
| 567 | // Visit operands
|
---|
| 568 | var op = binop.op
|
---|
| 569 | , left = this.visit(binop.left)
|
---|
| 570 | , right = ('||' == op || '&&' == op)
|
---|
| 571 | ? binop.right : this.visit(binop.right);
|
---|
| 572 |
|
---|
| 573 | // HACK: ternary
|
---|
| 574 | var val = binop.val
|
---|
| 575 | ? this.visit(binop.val)
|
---|
| 576 | : null;
|
---|
| 577 | this.return--;
|
---|
| 578 |
|
---|
| 579 | // Operate
|
---|
| 580 | try {
|
---|
| 581 | return this.visit(left.operate(op, right, val));
|
---|
| 582 | } catch (err) {
|
---|
| 583 | // disregard coercion issues in equality
|
---|
| 584 | // checks, and simply return false
|
---|
| 585 | if ('CoercionError' == err.name) {
|
---|
| 586 | switch (op) {
|
---|
| 587 | case '==':
|
---|
| 588 | return nodes.false;
|
---|
| 589 | case '!=':
|
---|
| 590 | return nodes.true;
|
---|
| 591 | }
|
---|
| 592 | }
|
---|
| 593 | throw err;
|
---|
| 594 | }
|
---|
| 595 | };
|
---|
| 596 |
|
---|
| 597 | /**
|
---|
| 598 | * Visit UnaryOp.
|
---|
| 599 | */
|
---|
| 600 |
|
---|
| 601 | Evaluator.prototype.visitUnaryOp = function(unary){
|
---|
| 602 | var op = unary.op
|
---|
| 603 | , node = this.visit(unary.expr);
|
---|
| 604 |
|
---|
| 605 | if ('!' != op) {
|
---|
| 606 | node = node.first.clone();
|
---|
| 607 | utils.assertType(node, 'unit');
|
---|
| 608 | }
|
---|
| 609 |
|
---|
| 610 | switch (op) {
|
---|
| 611 | case '-':
|
---|
| 612 | node.val = -node.val;
|
---|
| 613 | break;
|
---|
| 614 | case '+':
|
---|
| 615 | node.val = +node.val;
|
---|
| 616 | break;
|
---|
| 617 | case '~':
|
---|
| 618 | node.val = ~node.val;
|
---|
| 619 | break;
|
---|
| 620 | case '!':
|
---|
| 621 | return node.toBoolean().negate();
|
---|
| 622 | }
|
---|
| 623 |
|
---|
| 624 | return node;
|
---|
| 625 | };
|
---|
| 626 |
|
---|
| 627 | /**
|
---|
| 628 | * Visit TernaryOp.
|
---|
| 629 | */
|
---|
| 630 |
|
---|
| 631 | Evaluator.prototype.visitTernary = function(ternary){
|
---|
| 632 | var ok = this.visit(ternary.cond).toBoolean();
|
---|
| 633 | return ok.isTrue
|
---|
| 634 | ? this.visit(ternary.trueExpr)
|
---|
| 635 | : this.visit(ternary.falseExpr);
|
---|
| 636 | };
|
---|
| 637 |
|
---|
| 638 | /**
|
---|
| 639 | * Visit Expression.
|
---|
| 640 | */
|
---|
| 641 |
|
---|
| 642 | Evaluator.prototype.visitExpression = function(expr){
|
---|
| 643 | for (var i = 0, len = expr.nodes.length; i < len; ++i) {
|
---|
| 644 | expr.nodes[i] = this.visit(expr.nodes[i]);
|
---|
| 645 | }
|
---|
| 646 |
|
---|
| 647 | // support (n * 5)px etc
|
---|
| 648 | if (this.castable(expr)) expr = this.cast(expr);
|
---|
| 649 |
|
---|
| 650 | return expr;
|
---|
| 651 | };
|
---|
| 652 |
|
---|
| 653 | /**
|
---|
| 654 | * Visit Arguments.
|
---|
| 655 | */
|
---|
| 656 |
|
---|
| 657 | Evaluator.prototype.visitArguments = Evaluator.prototype.visitExpression;
|
---|
| 658 |
|
---|
| 659 | /**
|
---|
| 660 | * Visit Property.
|
---|
| 661 | */
|
---|
| 662 |
|
---|
| 663 | Evaluator.prototype.visitProperty = function(prop){
|
---|
| 664 | var name = this.interpolate(prop)
|
---|
| 665 | , fn = this.lookup(name)
|
---|
| 666 | , call = fn && 'function' == fn.first.nodeName
|
---|
| 667 | , literal = ~this.calling.indexOf(name)
|
---|
| 668 | , _prop = this.property;
|
---|
| 669 |
|
---|
| 670 | // Function of the same name
|
---|
| 671 | if (call && !literal && !prop.literal) {
|
---|
| 672 | var args = nodes.Arguments.fromExpression(utils.unwrap(prop.expr.clone()));
|
---|
| 673 | prop.name = name;
|
---|
| 674 | this.property = prop;
|
---|
| 675 | this.return++;
|
---|
| 676 | this.property.expr = this.visit(prop.expr);
|
---|
| 677 | this.return--;
|
---|
| 678 | var ret = this.visit(new nodes.Call(name, args));
|
---|
| 679 | this.property = _prop;
|
---|
| 680 | return ret;
|
---|
| 681 | // Regular property
|
---|
| 682 | } else {
|
---|
| 683 | this.return++;
|
---|
| 684 | prop.name = name;
|
---|
| 685 | prop.literal = true;
|
---|
| 686 | this.property = prop;
|
---|
| 687 | prop.expr = this.visit(prop.expr);
|
---|
| 688 | this.property = _prop;
|
---|
| 689 | this.return--;
|
---|
| 690 | return prop;
|
---|
| 691 | }
|
---|
| 692 | };
|
---|
| 693 |
|
---|
| 694 | /**
|
---|
| 695 | * Visit Root.
|
---|
| 696 | */
|
---|
| 697 |
|
---|
| 698 | Evaluator.prototype.visitRoot = function(block){
|
---|
| 699 | // normalize cached imports
|
---|
| 700 | if (block != this.root) {
|
---|
| 701 | block.constructor = nodes.Block;
|
---|
| 702 | return this.visit(block);
|
---|
| 703 | }
|
---|
| 704 |
|
---|
| 705 | for (var i = 0; i < block.nodes.length; ++i) {
|
---|
| 706 | block.index = i;
|
---|
| 707 | block.nodes[i] = this.visit(block.nodes[i]);
|
---|
| 708 | }
|
---|
| 709 | return block;
|
---|
| 710 | };
|
---|
| 711 |
|
---|
| 712 | /**
|
---|
| 713 | * Visit Block.
|
---|
| 714 | */
|
---|
| 715 |
|
---|
| 716 | Evaluator.prototype.visitBlock = function(block){
|
---|
| 717 | this.stack.push(new Frame(block));
|
---|
| 718 | for (block.index = 0; block.index < block.nodes.length; ++block.index) {
|
---|
| 719 | try {
|
---|
| 720 | block.nodes[block.index] = this.visit(block.nodes[block.index]);
|
---|
| 721 | } catch (err) {
|
---|
| 722 | if ('return' == err.nodeName) {
|
---|
| 723 | if (this.return) {
|
---|
| 724 | this.stack.pop();
|
---|
| 725 | throw err;
|
---|
| 726 | } else {
|
---|
| 727 | block.nodes[block.index] = err;
|
---|
| 728 | break;
|
---|
| 729 | }
|
---|
| 730 | } else {
|
---|
| 731 | throw err;
|
---|
| 732 | }
|
---|
| 733 | }
|
---|
| 734 | }
|
---|
| 735 | this.stack.pop();
|
---|
| 736 | return block;
|
---|
| 737 | };
|
---|
| 738 |
|
---|
| 739 | /**
|
---|
| 740 | * Visit Atblock.
|
---|
| 741 | */
|
---|
| 742 |
|
---|
| 743 | Evaluator.prototype.visitAtblock = function(atblock){
|
---|
| 744 | atblock.block = this.visit(atblock.block);
|
---|
| 745 | return atblock;
|
---|
| 746 | };
|
---|
| 747 |
|
---|
| 748 | /**
|
---|
| 749 | * Visit Atrule.
|
---|
| 750 | */
|
---|
| 751 |
|
---|
| 752 | Evaluator.prototype.visitAtrule = function(atrule){
|
---|
| 753 | atrule.val = this.interpolate(atrule);
|
---|
| 754 | if (atrule.block) atrule.block = this.visit(atrule.block);
|
---|
| 755 | return atrule;
|
---|
| 756 | };
|
---|
| 757 |
|
---|
| 758 | /**
|
---|
| 759 | * Visit Supports.
|
---|
| 760 | */
|
---|
| 761 |
|
---|
| 762 | Evaluator.prototype.visitSupports = function(node){
|
---|
| 763 | var condition = node.condition
|
---|
| 764 | , val;
|
---|
| 765 |
|
---|
| 766 | this.return++;
|
---|
| 767 | node.condition = this.visit(condition);
|
---|
| 768 | this.return--;
|
---|
| 769 |
|
---|
| 770 | val = condition.first;
|
---|
| 771 | if (1 == condition.nodes.length
|
---|
| 772 | && 'string' == val.nodeName) {
|
---|
| 773 | node.condition = val.string;
|
---|
| 774 | }
|
---|
| 775 | node.block = this.visit(node.block);
|
---|
| 776 | return node;
|
---|
| 777 | };
|
---|
| 778 |
|
---|
| 779 | /**
|
---|
| 780 | * Visit If.
|
---|
| 781 | */
|
---|
| 782 |
|
---|
| 783 | Evaluator.prototype.visitIf = function(node){
|
---|
| 784 | var ret
|
---|
| 785 | , block = this.currentBlock
|
---|
| 786 | , negate = node.negate;
|
---|
| 787 |
|
---|
| 788 | this.return++;
|
---|
| 789 | var ok = this.visit(node.cond).first.toBoolean();
|
---|
| 790 | this.return--;
|
---|
| 791 |
|
---|
| 792 | node.block.scope = node.block.hasMedia;
|
---|
| 793 |
|
---|
| 794 | // Evaluate body
|
---|
| 795 | if (negate) {
|
---|
| 796 | // unless
|
---|
| 797 | if (ok.isFalse) {
|
---|
| 798 | ret = this.visit(node.block);
|
---|
| 799 | }
|
---|
| 800 | } else {
|
---|
| 801 | // if
|
---|
| 802 | if (ok.isTrue) {
|
---|
| 803 | ret = this.visit(node.block);
|
---|
| 804 | // else
|
---|
| 805 | } else if (node.elses.length) {
|
---|
| 806 | var elses = node.elses
|
---|
| 807 | , len = elses.length
|
---|
| 808 | , cond;
|
---|
| 809 | for (var i = 0; i < len; ++i) {
|
---|
| 810 | // else if
|
---|
| 811 | if (elses[i].cond) {
|
---|
| 812 | elses[i].block.scope = elses[i].block.hasMedia;
|
---|
| 813 | this.return++;
|
---|
| 814 | cond = this.visit(elses[i].cond).first.toBoolean();
|
---|
| 815 | this.return--;
|
---|
| 816 | if (cond.isTrue) {
|
---|
| 817 | ret = this.visit(elses[i].block);
|
---|
| 818 | break;
|
---|
| 819 | }
|
---|
| 820 | // else
|
---|
| 821 | } else {
|
---|
| 822 | elses[i].scope = elses[i].hasMedia;
|
---|
| 823 | ret = this.visit(elses[i]);
|
---|
| 824 | }
|
---|
| 825 | }
|
---|
| 826 | }
|
---|
| 827 | }
|
---|
| 828 |
|
---|
| 829 | // mixin conditional statements within
|
---|
| 830 | // a selector group or at-rule
|
---|
| 831 | if (ret && !node.postfix && block.node
|
---|
| 832 | && ~['group'
|
---|
| 833 | , 'atrule'
|
---|
| 834 | , 'media'
|
---|
| 835 | , 'supports'
|
---|
| 836 | , 'keyframes'].indexOf(block.node.nodeName)) {
|
---|
| 837 | this.mixin(ret.nodes, block);
|
---|
| 838 | return nodes.null;
|
---|
| 839 | }
|
---|
| 840 |
|
---|
| 841 | return ret || nodes.null;
|
---|
| 842 | };
|
---|
| 843 |
|
---|
| 844 | /**
|
---|
| 845 | * Visit Extend.
|
---|
| 846 | */
|
---|
| 847 |
|
---|
| 848 | Evaluator.prototype.visitExtend = function(extend){
|
---|
| 849 | var block = this.currentBlock;
|
---|
| 850 | if ('group' != block.node.nodeName) block = this.closestGroup;
|
---|
| 851 | extend.selectors.forEach(function(selector){
|
---|
| 852 | block.node.extends.push({
|
---|
| 853 | // Cloning the selector for when we are in a loop and don't want it to affect
|
---|
| 854 | // the selector nodes and cause the values to be different to expected
|
---|
| 855 | selector: this.interpolate(selector.clone()).trim(),
|
---|
| 856 | optional: selector.optional,
|
---|
| 857 | lineno: selector.lineno,
|
---|
| 858 | column: selector.column
|
---|
| 859 | });
|
---|
| 860 | }, this);
|
---|
| 861 | return nodes.null;
|
---|
| 862 | };
|
---|
| 863 |
|
---|
| 864 | /**
|
---|
| 865 | * Visit Import.
|
---|
| 866 | */
|
---|
| 867 |
|
---|
| 868 | Evaluator.prototype.visitImport = function(imported){
|
---|
| 869 | this.return++;
|
---|
| 870 |
|
---|
| 871 | var path = this.visit(imported.path).first
|
---|
| 872 | , nodeName = imported.once ? 'require' : 'import'
|
---|
| 873 | , found
|
---|
| 874 | , literal;
|
---|
| 875 |
|
---|
| 876 | this.return--;
|
---|
| 877 | debug('import %s', path);
|
---|
| 878 |
|
---|
| 879 | // url() passed
|
---|
| 880 | if ('url' == path.name) {
|
---|
| 881 | if (imported.once) throw new Error('You cannot @require a url');
|
---|
| 882 |
|
---|
| 883 | return imported;
|
---|
| 884 | }
|
---|
| 885 |
|
---|
| 886 | // Ensure string
|
---|
| 887 | if (!path.string) throw new Error('@' + nodeName + ' string expected');
|
---|
| 888 |
|
---|
| 889 | var name = path = path.string;
|
---|
| 890 |
|
---|
| 891 | // Absolute URL or hash
|
---|
| 892 | if (/(?:url\s*\(\s*)?['"]?(?:#|(?:https?:)?\/\/)/i.test(path)) {
|
---|
| 893 | if (imported.once) throw new Error('You cannot @require a url');
|
---|
| 894 | return imported;
|
---|
| 895 | }
|
---|
| 896 |
|
---|
| 897 | // Literal
|
---|
| 898 | if (/\.css(?:"|$)/.test(path)) {
|
---|
| 899 | literal = true;
|
---|
| 900 | if (!imported.once && !this.includeCSS) {
|
---|
| 901 | return imported;
|
---|
| 902 | }
|
---|
| 903 | }
|
---|
| 904 |
|
---|
| 905 | // support optional .styl
|
---|
| 906 | if (!literal && !/\.styl$/i.test(path)) path += '.styl';
|
---|
| 907 |
|
---|
| 908 | // Lookup
|
---|
| 909 | found = utils.find(path, this.paths, this.filename);
|
---|
| 910 | if (!found) {
|
---|
| 911 | found = utils.lookupIndex(name, this.paths, this.filename);
|
---|
| 912 | }
|
---|
| 913 |
|
---|
| 914 | // Throw if import failed
|
---|
| 915 | if (!found) throw new Error('failed to locate @' + nodeName + ' file ' + path);
|
---|
| 916 |
|
---|
| 917 | var block = new nodes.Block;
|
---|
| 918 |
|
---|
| 919 | for (var i = 0, len = found.length; i < len; ++i) {
|
---|
| 920 | block.push(importFile.call(this, imported, found[i], literal));
|
---|
| 921 | }
|
---|
| 922 |
|
---|
| 923 | return block;
|
---|
| 924 | };
|
---|
| 925 |
|
---|
| 926 | /**
|
---|
| 927 | * Invoke `fn` with `args`.
|
---|
| 928 | *
|
---|
| 929 | * @param {Function} fn
|
---|
| 930 | * @param {Array} args
|
---|
| 931 | * @return {Node}
|
---|
| 932 | * @api private
|
---|
| 933 | */
|
---|
| 934 |
|
---|
| 935 | Evaluator.prototype.invokeFunction = function(fn, args, content){
|
---|
| 936 | var block = new nodes.Block(fn.block.parent);
|
---|
| 937 |
|
---|
| 938 | // Clone the function body
|
---|
| 939 | // to prevent mutation of subsequent calls
|
---|
| 940 | var body = fn.block.clone(block);
|
---|
| 941 |
|
---|
| 942 | // mixin block
|
---|
| 943 | var mixinBlock = this.stack.currentFrame.block;
|
---|
| 944 |
|
---|
| 945 | // new block scope
|
---|
| 946 | this.stack.push(new Frame(block));
|
---|
| 947 | var scope = this.currentScope;
|
---|
| 948 |
|
---|
| 949 | // normalize arguments
|
---|
| 950 | if ('arguments' != args.nodeName) {
|
---|
| 951 | var expr = new nodes.Expression;
|
---|
| 952 | expr.push(args);
|
---|
| 953 | args = nodes.Arguments.fromExpression(expr);
|
---|
| 954 | }
|
---|
| 955 |
|
---|
| 956 | // arguments local
|
---|
| 957 | scope.add(new nodes.Ident('arguments', args));
|
---|
| 958 |
|
---|
| 959 | // mixin scope introspection
|
---|
| 960 | scope.add(new nodes.Ident('mixin', this.return
|
---|
| 961 | ? nodes.false
|
---|
| 962 | : new nodes.String(mixinBlock.nodeName)));
|
---|
| 963 |
|
---|
| 964 | // current property
|
---|
| 965 | if (this.property) {
|
---|
| 966 | var prop = this.propertyExpression(this.property, fn.name);
|
---|
| 967 | scope.add(new nodes.Ident('current-property', prop));
|
---|
| 968 | } else {
|
---|
| 969 | scope.add(new nodes.Ident('current-property', nodes.null));
|
---|
| 970 | }
|
---|
| 971 |
|
---|
| 972 | // current call stack
|
---|
| 973 | var expr = new nodes.Expression;
|
---|
| 974 | for (var i = this.calling.length - 1; i-- ; ) {
|
---|
| 975 | expr.push(new nodes.Literal(this.calling[i]));
|
---|
| 976 | };
|
---|
| 977 | scope.add(new nodes.Ident('called-from', expr));
|
---|
| 978 |
|
---|
| 979 | // inject arguments as locals
|
---|
| 980 | var i = 0
|
---|
| 981 | , len = args.nodes.length;
|
---|
| 982 | fn.params.nodes.forEach(function(node){
|
---|
| 983 | // rest param support
|
---|
| 984 | if (node.rest) {
|
---|
| 985 | node.val = new nodes.Expression;
|
---|
| 986 | for (; i < len; ++i) node.val.push(args.nodes[i]);
|
---|
| 987 | node.val.preserve = true;
|
---|
| 988 | node.val.isList = args.isList;
|
---|
| 989 | // argument default support
|
---|
| 990 | } else {
|
---|
| 991 | var arg = args.map[node.name] || args.nodes[i++];
|
---|
| 992 | node = node.clone();
|
---|
| 993 | if (arg) {
|
---|
| 994 | arg.isEmpty ? args.nodes[i - 1] = this.visit(node) : node.val = arg;
|
---|
| 995 | } else {
|
---|
| 996 | args.push(node.val);
|
---|
| 997 | }
|
---|
| 998 |
|
---|
| 999 | // required argument not satisfied
|
---|
| 1000 | if (node.val.isNull) {
|
---|
| 1001 | throw new Error('argument "' + node + '" required for ' + fn);
|
---|
| 1002 | }
|
---|
| 1003 | }
|
---|
| 1004 |
|
---|
| 1005 | scope.add(node);
|
---|
| 1006 | }, this);
|
---|
| 1007 |
|
---|
| 1008 | // mixin block
|
---|
| 1009 | if (content) scope.add(new nodes.Ident('block', content, true));
|
---|
| 1010 |
|
---|
| 1011 | // invoke
|
---|
| 1012 | return this.invoke(body, true, fn.filename);
|
---|
| 1013 | };
|
---|
| 1014 |
|
---|
| 1015 | /**
|
---|
| 1016 | * Invoke built-in `fn` with `args`.
|
---|
| 1017 | *
|
---|
| 1018 | * @param {Function} fn
|
---|
| 1019 | * @param {Array} args
|
---|
| 1020 | * @return {Node}
|
---|
| 1021 | * @api private
|
---|
| 1022 | */
|
---|
| 1023 |
|
---|
| 1024 | Evaluator.prototype.invokeBuiltin = function(fn, args){
|
---|
| 1025 | // Map arguments to first node
|
---|
| 1026 | // providing a nicer js api for
|
---|
| 1027 | // BIFs. Functions may specify that
|
---|
| 1028 | // they wish to accept full expressions
|
---|
| 1029 | // via .raw
|
---|
| 1030 | if (fn.raw) {
|
---|
| 1031 | args = args.nodes;
|
---|
| 1032 | } else {
|
---|
| 1033 | if (!fn.params) {
|
---|
| 1034 | fn.params = utils.params(fn);
|
---|
| 1035 | }
|
---|
| 1036 | args = fn.params.reduce(function(ret, param){
|
---|
| 1037 | var arg = args.map[param] || args.nodes.shift()
|
---|
| 1038 | if (arg) {
|
---|
| 1039 | arg = utils.unwrap(arg);
|
---|
| 1040 | var len = arg.nodes.length;
|
---|
| 1041 | if (len > 1) {
|
---|
| 1042 | for (var i = 0; i < len; ++i) {
|
---|
| 1043 | ret.push(utils.unwrap(arg.nodes[i].first));
|
---|
| 1044 | }
|
---|
| 1045 | } else {
|
---|
| 1046 | ret.push(arg.first);
|
---|
| 1047 | }
|
---|
| 1048 | }
|
---|
| 1049 | return ret;
|
---|
| 1050 | }, []);
|
---|
| 1051 | }
|
---|
| 1052 |
|
---|
| 1053 | // Invoke the BIF
|
---|
| 1054 | var body = utils.coerce(fn.apply(this, args));
|
---|
| 1055 |
|
---|
| 1056 | // Always wrapping allows js functions
|
---|
| 1057 | // to return several values with a single
|
---|
| 1058 | // Expression node
|
---|
| 1059 | var expr = new nodes.Expression;
|
---|
| 1060 | expr.push(body);
|
---|
| 1061 | body = expr;
|
---|
| 1062 |
|
---|
| 1063 | // Invoke
|
---|
| 1064 | return this.invoke(body);
|
---|
| 1065 | };
|
---|
| 1066 |
|
---|
| 1067 | /**
|
---|
| 1068 | * Invoke the given function `body`.
|
---|
| 1069 | *
|
---|
| 1070 | * @param {Block} body
|
---|
| 1071 | * @return {Node}
|
---|
| 1072 | * @api private
|
---|
| 1073 | */
|
---|
| 1074 |
|
---|
| 1075 | Evaluator.prototype.invoke = function(body, stack, filename){
|
---|
| 1076 | var self = this
|
---|
| 1077 | , ret;
|
---|
| 1078 |
|
---|
| 1079 | if (filename) this.paths.push(dirname(filename));
|
---|
| 1080 |
|
---|
| 1081 | // Return
|
---|
| 1082 | if (this.return) {
|
---|
| 1083 | ret = this.eval(body.nodes);
|
---|
| 1084 | if (stack) this.stack.pop();
|
---|
| 1085 | // Mixin
|
---|
| 1086 | } else {
|
---|
| 1087 | body = this.visit(body);
|
---|
| 1088 | if (stack) this.stack.pop();
|
---|
| 1089 | this.mixin(body.nodes, this.currentBlock);
|
---|
| 1090 | ret = nodes.null;
|
---|
| 1091 | }
|
---|
| 1092 |
|
---|
| 1093 | if (filename) this.paths.pop();
|
---|
| 1094 |
|
---|
| 1095 | return ret;
|
---|
| 1096 | };
|
---|
| 1097 |
|
---|
| 1098 | /**
|
---|
| 1099 | * Mixin the given `nodes` to the given `block`.
|
---|
| 1100 | *
|
---|
| 1101 | * @param {Array} nodes
|
---|
| 1102 | * @param {Block} block
|
---|
| 1103 | * @api private
|
---|
| 1104 | */
|
---|
| 1105 |
|
---|
| 1106 | Evaluator.prototype.mixin = function(nodes, block){
|
---|
| 1107 | if (!nodes.length) return;
|
---|
| 1108 | var len = block.nodes.length
|
---|
| 1109 | , head = block.nodes.slice(0, block.index)
|
---|
| 1110 | , tail = block.nodes.slice(block.index + 1, len);
|
---|
| 1111 | this._mixin(nodes, head, block);
|
---|
| 1112 | block.index = 0;
|
---|
| 1113 | block.nodes = head.concat(tail);
|
---|
| 1114 | };
|
---|
| 1115 |
|
---|
| 1116 | /**
|
---|
| 1117 | * Mixin the given `items` to the `dest` array.
|
---|
| 1118 | *
|
---|
| 1119 | * @param {Array} items
|
---|
| 1120 | * @param {Array} dest
|
---|
| 1121 | * @param {Block} block
|
---|
| 1122 | * @api private
|
---|
| 1123 | */
|
---|
| 1124 |
|
---|
| 1125 | Evaluator.prototype._mixin = function(items, dest, block){
|
---|
| 1126 | var node
|
---|
| 1127 | , len = items.length;
|
---|
| 1128 | for (var i = 0; i < len; ++i) {
|
---|
| 1129 | switch ((node = items[i]).nodeName) {
|
---|
| 1130 | case 'return':
|
---|
| 1131 | return;
|
---|
| 1132 | case 'block':
|
---|
| 1133 | this._mixin(node.nodes, dest, block);
|
---|
| 1134 | break;
|
---|
| 1135 | case 'media':
|
---|
| 1136 | // fix link to the parent block
|
---|
| 1137 | var parentNode = node.block.parent.node;
|
---|
| 1138 | if (parentNode && 'call' != parentNode.nodeName) {
|
---|
| 1139 | node.block.parent = block;
|
---|
| 1140 | }
|
---|
| 1141 | case 'property':
|
---|
| 1142 | var val = node.expr;
|
---|
| 1143 | // prevent `block` mixin recursion
|
---|
| 1144 | if (node.literal && 'block' == val.first.name) {
|
---|
| 1145 | val = utils.unwrap(val);
|
---|
| 1146 | val.nodes[0] = new nodes.Literal('block');
|
---|
| 1147 | }
|
---|
| 1148 | default:
|
---|
| 1149 | dest.push(node);
|
---|
| 1150 | }
|
---|
| 1151 | }
|
---|
| 1152 | };
|
---|
| 1153 |
|
---|
| 1154 | /**
|
---|
| 1155 | * Mixin the given `node` to the current block.
|
---|
| 1156 | *
|
---|
| 1157 | * @param {Node} node
|
---|
| 1158 | * @api private
|
---|
| 1159 | */
|
---|
| 1160 |
|
---|
| 1161 | Evaluator.prototype.mixinNode = function(node){
|
---|
| 1162 | node = this.visit(node.first);
|
---|
| 1163 | switch (node.nodeName) {
|
---|
| 1164 | case 'object':
|
---|
| 1165 | this.mixinObject(node);
|
---|
| 1166 | return nodes.null;
|
---|
| 1167 | case 'block':
|
---|
| 1168 | case 'atblock':
|
---|
| 1169 | this.mixin(node.nodes, this.currentBlock);
|
---|
| 1170 | return nodes.null;
|
---|
| 1171 | }
|
---|
| 1172 | };
|
---|
| 1173 |
|
---|
| 1174 | /**
|
---|
| 1175 | * Mixin the given `object` to the current block.
|
---|
| 1176 | *
|
---|
| 1177 | * @param {Object} object
|
---|
| 1178 | * @api private
|
---|
| 1179 | */
|
---|
| 1180 |
|
---|
| 1181 | Evaluator.prototype.mixinObject = function(object){
|
---|
| 1182 | var Parser = require('../parser')
|
---|
| 1183 | , root = this.root
|
---|
| 1184 | , str = '$block ' + object.toBlock()
|
---|
| 1185 | , parser = new Parser(str, utils.merge({ root: block }, this.options))
|
---|
| 1186 | , block;
|
---|
| 1187 |
|
---|
| 1188 | try {
|
---|
| 1189 | block = parser.parse();
|
---|
| 1190 | } catch (err) {
|
---|
| 1191 | err.filename = this.filename;
|
---|
| 1192 | err.lineno = parser.lexer.lineno;
|
---|
| 1193 | err.column = parser.lexer.column;
|
---|
| 1194 | err.input = str;
|
---|
| 1195 | throw err;
|
---|
| 1196 | }
|
---|
| 1197 |
|
---|
| 1198 | block.parent = root;
|
---|
| 1199 | block.scope = false;
|
---|
| 1200 | var ret = this.visit(block)
|
---|
| 1201 | , vals = ret.first.nodes;
|
---|
| 1202 | for (var i = 0, len = vals.length; i < len; ++i) {
|
---|
| 1203 | if (vals[i].block) {
|
---|
| 1204 | this.mixin(vals[i].block.nodes, this.currentBlock);
|
---|
| 1205 | break;
|
---|
| 1206 | }
|
---|
| 1207 | }
|
---|
| 1208 | };
|
---|
| 1209 |
|
---|
| 1210 | /**
|
---|
| 1211 | * Evaluate the given `vals`.
|
---|
| 1212 | *
|
---|
| 1213 | * @param {Array} vals
|
---|
| 1214 | * @return {Node}
|
---|
| 1215 | * @api private
|
---|
| 1216 | */
|
---|
| 1217 |
|
---|
| 1218 | Evaluator.prototype.eval = function(vals){
|
---|
| 1219 | if (!vals) return nodes.null;
|
---|
| 1220 | var len = vals.length
|
---|
| 1221 | , node = nodes.null;
|
---|
| 1222 |
|
---|
| 1223 | try {
|
---|
| 1224 | for (var i = 0; i < len; ++i) {
|
---|
| 1225 | node = vals[i];
|
---|
| 1226 | switch (node.nodeName) {
|
---|
| 1227 | case 'if':
|
---|
| 1228 | if ('block' != node.block.nodeName) {
|
---|
| 1229 | node = this.visit(node);
|
---|
| 1230 | break;
|
---|
| 1231 | }
|
---|
| 1232 | case 'each':
|
---|
| 1233 | case 'block':
|
---|
| 1234 | node = this.visit(node);
|
---|
| 1235 | if (node.nodes) node = this.eval(node.nodes);
|
---|
| 1236 | break;
|
---|
| 1237 | default:
|
---|
| 1238 | node = this.visit(node);
|
---|
| 1239 | }
|
---|
| 1240 | }
|
---|
| 1241 | } catch (err) {
|
---|
| 1242 | if ('return' == err.nodeName) {
|
---|
| 1243 | return err.expr;
|
---|
| 1244 | } else {
|
---|
| 1245 | throw err;
|
---|
| 1246 | }
|
---|
| 1247 | }
|
---|
| 1248 |
|
---|
| 1249 | return node;
|
---|
| 1250 | };
|
---|
| 1251 |
|
---|
| 1252 | /**
|
---|
| 1253 | * Literal function `call`.
|
---|
| 1254 | *
|
---|
| 1255 | * @param {Call} call
|
---|
| 1256 | * @return {call}
|
---|
| 1257 | * @api private
|
---|
| 1258 | */
|
---|
| 1259 |
|
---|
| 1260 | Evaluator.prototype.literalCall = function(call){
|
---|
| 1261 | call.args = this.visit(call.args);
|
---|
| 1262 | return call;
|
---|
| 1263 | };
|
---|
| 1264 |
|
---|
| 1265 | /**
|
---|
| 1266 | * Lookup property `name`.
|
---|
| 1267 | *
|
---|
| 1268 | * @param {String} name
|
---|
| 1269 | * @return {Property}
|
---|
| 1270 | * @api private
|
---|
| 1271 | */
|
---|
| 1272 |
|
---|
| 1273 | Evaluator.prototype.lookupProperty = function(name){
|
---|
| 1274 | var i = this.stack.length
|
---|
| 1275 | , index = this.currentBlock.index
|
---|
| 1276 | , top = i
|
---|
| 1277 | , nodes
|
---|
| 1278 | , block
|
---|
| 1279 | , len
|
---|
| 1280 | , other;
|
---|
| 1281 |
|
---|
| 1282 | while (i--) {
|
---|
| 1283 | block = this.stack[i].block;
|
---|
| 1284 | if (!block.node) continue;
|
---|
| 1285 | switch (block.node.nodeName) {
|
---|
| 1286 | case 'group':
|
---|
| 1287 | case 'function':
|
---|
| 1288 | case 'if':
|
---|
| 1289 | case 'each':
|
---|
| 1290 | case 'atrule':
|
---|
| 1291 | case 'media':
|
---|
| 1292 | case 'atblock':
|
---|
| 1293 | case 'call':
|
---|
| 1294 | nodes = block.nodes;
|
---|
| 1295 | // scan siblings from the property index up
|
---|
| 1296 | if (i + 1 == top) {
|
---|
| 1297 | while (index--) {
|
---|
| 1298 | // ignore current property
|
---|
| 1299 | if (this.property == nodes[index]) continue;
|
---|
| 1300 | other = this.interpolate(nodes[index]);
|
---|
| 1301 | if (name == other) return nodes[index].clone();
|
---|
| 1302 | }
|
---|
| 1303 | // sequential lookup for non-siblings (for now)
|
---|
| 1304 | } else {
|
---|
| 1305 | len = nodes.length;
|
---|
| 1306 | while (len--) {
|
---|
| 1307 | if ('property' != nodes[len].nodeName
|
---|
| 1308 | || this.property == nodes[len]) continue;
|
---|
| 1309 | other = this.interpolate(nodes[len]);
|
---|
| 1310 | if (name == other) return nodes[len].clone();
|
---|
| 1311 | }
|
---|
| 1312 | }
|
---|
| 1313 | break;
|
---|
| 1314 | }
|
---|
| 1315 | }
|
---|
| 1316 |
|
---|
| 1317 | return nodes.null;
|
---|
| 1318 | };
|
---|
| 1319 |
|
---|
| 1320 | /**
|
---|
| 1321 | * Return the closest mixin-able `Block`.
|
---|
| 1322 | *
|
---|
| 1323 | * @return {Block}
|
---|
| 1324 | * @api private
|
---|
| 1325 | */
|
---|
| 1326 |
|
---|
| 1327 | Evaluator.prototype.__defineGetter__('closestBlock', function(){
|
---|
| 1328 | var i = this.stack.length
|
---|
| 1329 | , block;
|
---|
| 1330 | while (i--) {
|
---|
| 1331 | block = this.stack[i].block;
|
---|
| 1332 | if (block.node) {
|
---|
| 1333 | switch (block.node.nodeName) {
|
---|
| 1334 | case 'group':
|
---|
| 1335 | case 'keyframes':
|
---|
| 1336 | case 'atrule':
|
---|
| 1337 | case 'atblock':
|
---|
| 1338 | case 'media':
|
---|
| 1339 | case 'call':
|
---|
| 1340 | return block;
|
---|
| 1341 | }
|
---|
| 1342 | }
|
---|
| 1343 | }
|
---|
| 1344 | });
|
---|
| 1345 |
|
---|
| 1346 | /**
|
---|
| 1347 | * Return the closest group block.
|
---|
| 1348 | *
|
---|
| 1349 | * @return {Block}
|
---|
| 1350 | * @api private
|
---|
| 1351 | */
|
---|
| 1352 |
|
---|
| 1353 | Evaluator.prototype.__defineGetter__('closestGroup', function(){
|
---|
| 1354 | var i = this.stack.length
|
---|
| 1355 | , block;
|
---|
| 1356 | while (i--) {
|
---|
| 1357 | block = this.stack[i].block;
|
---|
| 1358 | if (block.node && 'group' == block.node.nodeName) {
|
---|
| 1359 | return block;
|
---|
| 1360 | }
|
---|
| 1361 | }
|
---|
| 1362 | });
|
---|
| 1363 |
|
---|
| 1364 | /**
|
---|
| 1365 | * Return the current selectors stack.
|
---|
| 1366 | *
|
---|
| 1367 | * @return {Array}
|
---|
| 1368 | * @api private
|
---|
| 1369 | */
|
---|
| 1370 |
|
---|
| 1371 | Evaluator.prototype.__defineGetter__('selectorStack', function(){
|
---|
| 1372 | var block
|
---|
| 1373 | , stack = [];
|
---|
| 1374 | for (var i = 0, len = this.stack.length; i < len; ++i) {
|
---|
| 1375 | block = this.stack[i].block;
|
---|
| 1376 | if (block.node && 'group' == block.node.nodeName) {
|
---|
| 1377 | block.node.nodes.forEach(function(selector) {
|
---|
| 1378 | if (!selector.val) selector.val = this.interpolate(selector);
|
---|
| 1379 | }, this);
|
---|
| 1380 | stack.push(block.node.nodes);
|
---|
| 1381 | }
|
---|
| 1382 | }
|
---|
| 1383 | return stack;
|
---|
| 1384 | });
|
---|
| 1385 |
|
---|
| 1386 | /**
|
---|
| 1387 | * Lookup `name`, with support for JavaScript
|
---|
| 1388 | * functions, and BIFs.
|
---|
| 1389 | *
|
---|
| 1390 | * @param {String} name
|
---|
| 1391 | * @return {Node}
|
---|
| 1392 | * @api private
|
---|
| 1393 | */
|
---|
| 1394 |
|
---|
| 1395 | Evaluator.prototype.lookup = function(name){
|
---|
| 1396 | var val;
|
---|
| 1397 | if (this.ignoreColors && name in colors) return;
|
---|
| 1398 | if (val = this.stack.lookup(name)) {
|
---|
| 1399 | return utils.unwrap(val);
|
---|
| 1400 | } else {
|
---|
| 1401 | return this.lookupFunction(name);
|
---|
| 1402 | }
|
---|
| 1403 | };
|
---|
| 1404 |
|
---|
| 1405 | /**
|
---|
| 1406 | * Map segments in `node` returning a string.
|
---|
| 1407 | *
|
---|
| 1408 | * @param {Node} node
|
---|
| 1409 | * @return {String}
|
---|
| 1410 | * @api private
|
---|
| 1411 | */
|
---|
| 1412 |
|
---|
| 1413 | Evaluator.prototype.interpolate = function(node){
|
---|
| 1414 | var self = this
|
---|
| 1415 | , isSelector = ('selector' == node.nodeName);
|
---|
| 1416 | function toString(node) {
|
---|
| 1417 | switch (node.nodeName) {
|
---|
| 1418 | case 'function':
|
---|
| 1419 | case 'ident':
|
---|
| 1420 | return node.name;
|
---|
| 1421 | case 'literal':
|
---|
| 1422 | case 'string':
|
---|
| 1423 | if (self.prefix && !node.prefixed && !node.val.nodeName) {
|
---|
| 1424 | node.val = node.val.replace(/\.(?=[\w-])|^\.$/g, '.' + self.prefix);
|
---|
| 1425 | node.prefixed = true;
|
---|
| 1426 | }
|
---|
| 1427 | return node.val;
|
---|
| 1428 | case 'unit':
|
---|
| 1429 | // Interpolation inside keyframes
|
---|
| 1430 | return '%' == node.type ? node.val + '%' : node.val;
|
---|
| 1431 | case 'member':
|
---|
| 1432 | return toString(self.visit(node));
|
---|
| 1433 | case 'expression':
|
---|
| 1434 | // Prevent cyclic `selector()` calls.
|
---|
| 1435 | if (self.calling && ~self.calling.indexOf('selector') && self._selector) return self._selector;
|
---|
| 1436 | self.return++;
|
---|
| 1437 | var ret = toString(self.visit(node).first);
|
---|
| 1438 | self.return--;
|
---|
| 1439 | if (isSelector) self._selector = ret;
|
---|
| 1440 | return ret;
|
---|
| 1441 | }
|
---|
| 1442 | }
|
---|
| 1443 |
|
---|
| 1444 | if (node.segments) {
|
---|
| 1445 | return node.segments.map(toString).join('');
|
---|
| 1446 | } else {
|
---|
| 1447 | return toString(node);
|
---|
| 1448 | }
|
---|
| 1449 | };
|
---|
| 1450 |
|
---|
| 1451 | /**
|
---|
| 1452 | * Lookup JavaScript user-defined or built-in function.
|
---|
| 1453 | *
|
---|
| 1454 | * @param {String} name
|
---|
| 1455 | * @return {Function}
|
---|
| 1456 | * @api private
|
---|
| 1457 | */
|
---|
| 1458 |
|
---|
| 1459 | Evaluator.prototype.lookupFunction = function(name){
|
---|
| 1460 | var fn = this.functions[name] || bifs[name];
|
---|
| 1461 | if (fn) return new nodes.Function(name, fn);
|
---|
| 1462 | };
|
---|
| 1463 |
|
---|
| 1464 | /**
|
---|
| 1465 | * Check if the given `node` is an ident, and if it is defined.
|
---|
| 1466 | *
|
---|
| 1467 | * @param {Node} node
|
---|
| 1468 | * @return {Boolean}
|
---|
| 1469 | * @api private
|
---|
| 1470 | */
|
---|
| 1471 |
|
---|
| 1472 | Evaluator.prototype.isDefined = function(node){
|
---|
| 1473 | if ('ident' == node.nodeName) {
|
---|
| 1474 | return nodes.Boolean(this.lookup(node.name));
|
---|
| 1475 | } else {
|
---|
| 1476 | throw new Error('invalid "is defined" check on non-variable ' + node);
|
---|
| 1477 | }
|
---|
| 1478 | };
|
---|
| 1479 |
|
---|
| 1480 | /**
|
---|
| 1481 | * Return `Expression` based on the given `prop`,
|
---|
| 1482 | * replacing cyclic calls to the given function `name`
|
---|
| 1483 | * with "__CALL__".
|
---|
| 1484 | *
|
---|
| 1485 | * @param {Property} prop
|
---|
| 1486 | * @param {String} name
|
---|
| 1487 | * @return {Expression}
|
---|
| 1488 | * @api private
|
---|
| 1489 | */
|
---|
| 1490 |
|
---|
| 1491 | Evaluator.prototype.propertyExpression = function(prop, name){
|
---|
| 1492 | var expr = new nodes.Expression
|
---|
| 1493 | , val = prop.expr.clone();
|
---|
| 1494 |
|
---|
| 1495 | // name
|
---|
| 1496 | expr.push(new nodes.String(prop.name));
|
---|
| 1497 |
|
---|
| 1498 | // replace cyclic call with __CALL__
|
---|
| 1499 | function replace(node) {
|
---|
| 1500 | if ('call' == node.nodeName && name == node.name) {
|
---|
| 1501 | return new nodes.Literal('__CALL__');
|
---|
| 1502 | }
|
---|
| 1503 |
|
---|
| 1504 | if (node.nodes) node.nodes = node.nodes.map(replace);
|
---|
| 1505 | return node;
|
---|
| 1506 | }
|
---|
| 1507 |
|
---|
| 1508 | replace(val);
|
---|
| 1509 | expr.push(val);
|
---|
| 1510 | return expr;
|
---|
| 1511 | };
|
---|
| 1512 |
|
---|
| 1513 | /**
|
---|
| 1514 | * Cast `expr` to the trailing ident.
|
---|
| 1515 | *
|
---|
| 1516 | * @param {Expression} expr
|
---|
| 1517 | * @return {Unit}
|
---|
| 1518 | * @api private
|
---|
| 1519 | */
|
---|
| 1520 |
|
---|
| 1521 | Evaluator.prototype.cast = function(expr){
|
---|
| 1522 | return new nodes.Unit(expr.first.val, expr.nodes[1].name);
|
---|
| 1523 | };
|
---|
| 1524 |
|
---|
| 1525 | /**
|
---|
| 1526 | * Check if `expr` is castable.
|
---|
| 1527 | *
|
---|
| 1528 | * @param {Expression} expr
|
---|
| 1529 | * @return {Boolean}
|
---|
| 1530 | * @api private
|
---|
| 1531 | */
|
---|
| 1532 |
|
---|
| 1533 | Evaluator.prototype.castable = function(expr){
|
---|
| 1534 | return 2 == expr.nodes.length
|
---|
| 1535 | && 'unit' == expr.first.nodeName
|
---|
| 1536 | && ~units.indexOf(expr.nodes[1].name);
|
---|
| 1537 | };
|
---|
| 1538 |
|
---|
| 1539 | /**
|
---|
| 1540 | * Warn with the given `msg`.
|
---|
| 1541 | *
|
---|
| 1542 | * @param {String} msg
|
---|
| 1543 | * @api private
|
---|
| 1544 | */
|
---|
| 1545 |
|
---|
| 1546 | Evaluator.prototype.warn = function(msg){
|
---|
| 1547 | if (!this.warnings) return;
|
---|
| 1548 | console.warn('\u001b[33mWarning:\u001b[0m ' + msg);
|
---|
| 1549 | };
|
---|
| 1550 |
|
---|
| 1551 | /**
|
---|
| 1552 | * Return the current `Block`.
|
---|
| 1553 | *
|
---|
| 1554 | * @return {Block}
|
---|
| 1555 | * @api private
|
---|
| 1556 | */
|
---|
| 1557 |
|
---|
| 1558 | Evaluator.prototype.__defineGetter__('currentBlock', function(){
|
---|
| 1559 | return this.stack.currentFrame.block;
|
---|
| 1560 | });
|
---|
| 1561 |
|
---|
| 1562 | /**
|
---|
| 1563 | * Return an array of vendor names.
|
---|
| 1564 | *
|
---|
| 1565 | * @return {Array}
|
---|
| 1566 | * @api private
|
---|
| 1567 | */
|
---|
| 1568 |
|
---|
| 1569 | Evaluator.prototype.__defineGetter__('vendors', function(){
|
---|
| 1570 | return this.lookup('vendors').nodes.map(function(node){
|
---|
| 1571 | return node.string;
|
---|
| 1572 | });
|
---|
| 1573 | });
|
---|
| 1574 |
|
---|
| 1575 | /**
|
---|
| 1576 | * Return the property name without vendor prefix.
|
---|
| 1577 | *
|
---|
| 1578 | * @param {String} prop
|
---|
| 1579 | * @return {String}
|
---|
| 1580 | * @api public
|
---|
| 1581 | */
|
---|
| 1582 |
|
---|
| 1583 | Evaluator.prototype.unvendorize = function(prop){
|
---|
| 1584 | for (var i = 0, len = this.vendors.length; i < len; i++) {
|
---|
| 1585 | if ('official' != this.vendors[i]) {
|
---|
| 1586 | var vendor = '-' + this.vendors[i] + '-';
|
---|
| 1587 | if (~prop.indexOf(vendor)) return prop.replace(vendor, '');
|
---|
| 1588 | }
|
---|
| 1589 | }
|
---|
| 1590 | return prop;
|
---|
| 1591 | };
|
---|
| 1592 |
|
---|
| 1593 | /**
|
---|
| 1594 | * Return the current frame `Scope`.
|
---|
| 1595 | *
|
---|
| 1596 | * @return {Scope}
|
---|
| 1597 | * @api private
|
---|
| 1598 | */
|
---|
| 1599 |
|
---|
| 1600 | Evaluator.prototype.__defineGetter__('currentScope', function(){
|
---|
| 1601 | return this.stack.currentFrame.scope;
|
---|
| 1602 | });
|
---|
| 1603 |
|
---|
| 1604 | /**
|
---|
| 1605 | * Return the current `Frame`.
|
---|
| 1606 | *
|
---|
| 1607 | * @return {Frame}
|
---|
| 1608 | * @api private
|
---|
| 1609 | */
|
---|
| 1610 |
|
---|
| 1611 | Evaluator.prototype.__defineGetter__('currentFrame', function(){
|
---|
| 1612 | return this.stack.currentFrame;
|
---|
| 1613 | });
|
---|