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Comment from '../tree/comment';\nimport Node from '../tree/node';\nimport Dimension from '../tree/dimension';\nimport Declaration from '../tree/declaration';\nimport Expression from '../tree/expression';\nimport Ruleset from '../tree/ruleset';\nimport Selector from '../tree/selector';\nimport Element from '../tree/element';\nimport Quote from '../tree/quoted';\nimport Value from '../tree/value';\n\nconst getItemsFromNode = node => {\n // handle non-array values as an array of length 1\n // return 'undefined' if index is invalid\n const items = Array.isArray(node.value) ?\n node.value : Array(node);\n\n return items;\n};\n\nexport default {\n _SELF: function(n) {\n return n;\n },\n '~': function(...expr) {\n if (expr.length === 1) {\n return expr[0];\n }\n return new Value(expr);\n },\n extract: function(values, index) {\n // (1-based index)\n index = index.value - 1;\n\n return getItemsFromNode(values)[index];\n },\n length: function(values) {\n return new Dimension(getItemsFromNode(values).length);\n },\n /**\n * Creates a Less list of incremental values.\n * Modeled after Lodash's range function, also exists natively in PHP\n * \n * @param {Dimension} [start=1]\n * @param {Dimension} end - e.g. 10 or 10px - unit is added to output\n * @param {Dimension} [step=1] \n */\n range: function(start, end, step) {\n let from;\n let to;\n let stepValue = 1;\n const list = [];\n if (end) {\n to = end;\n from = start.value;\n if (step) {\n stepValue = step.value;\n }\n }\n else {\n from = 1;\n to = start;\n }\n\n for (let i = from; i <= to.value; i += stepValue) {\n list.push(new Dimension(i, to.unit));\n }\n\n return new Expression(list);\n },\n each: function(list, rs) {\n const rules = [];\n let newRules;\n let iterator;\n\n const tryEval = val => {\n if (val instanceof Node) {\n return val.eval(this.context);\n }\n return val;\n };\n\n if (list.value && !(list instanceof Quote)) {\n if (Array.isArray(list.value)) {\n iterator = list.value.map(tryEval);\n } else {\n iterator = [tryEval(list.value)];\n }\n } else if (list.ruleset) {\n iterator = tryEval(list.ruleset).rules;\n } else if (list.rules) {\n iterator = list.rules.map(tryEval);\n } else if (Array.isArray(list)) {\n iterator = list.map(tryEval);\n } else {\n iterator = [tryEval(list)];\n }\n\n let valueName = '@value';\n let keyName = '@key';\n let indexName = '@index';\n\n if (rs.params) {\n valueName = rs.params[0] && rs.params[0].name;\n keyName = rs.params[1] && rs.params[1].name;\n indexName = rs.params[2] && rs.params[2].name;\n rs = rs.rules;\n } else {\n rs = rs.ruleset;\n }\n\n for (let i = 0; i < iterator.length; i++) {\n let key;\n let value;\n const item = iterator[i];\n if (item instanceof Declaration) {\n key = typeof item.name === 'string' ? item.name : item.name[0].value;\n value = item.value;\n } else {\n key = new Dimension(i + 1);\n value = item;\n }\n\n if (item instanceof Comment) {\n continue;\n }\n\n newRules = rs.rules.slice(0);\n if (valueName) {\n newRules.push(new Declaration(valueName,\n value,\n false, false, this.index, this.currentFileInfo));\n }\n if (indexName) {\n newRules.push(new Declaration(indexName,\n new Dimension(i + 1),\n false, false, this.index, this.currentFileInfo));\n }\n if (keyName) {\n newRules.push(new Declaration(keyName,\n key,\n false, false, this.index, this.currentFileInfo));\n }\n\n rules.push(new Ruleset([ new(Selector)([ new Element(\"\", '&') ]) ],\n newRules,\n rs.strictImports,\n rs.visibilityInfo()\n ));\n }\n\n return new Ruleset([ new(Selector)([ new Element(\"\", '&') ]) ],\n rules,\n rs.strictImports,\n rs.visibilityInfo()\n ).eval(this.context);\n }\n};\n"]} |