TemplateTag.js
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'use strict';
Object.defineProperty(exports, "__esModule", {
value: true
});
var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();
var _templateObject = _taggedTemplateLiteral(['', ''], ['', '']);
function _taggedTemplateLiteral(strings, raw) { return Object.freeze(Object.defineProperties(strings, { raw: { value: Object.freeze(raw) } })); }
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
/**
* @class TemplateTag
* @classdesc Consumes a pipeline of composable transformer plugins and produces a template tag.
*/
var TemplateTag = function () {
/**
* constructs a template tag
* @constructs TemplateTag
* @param {...Object} [...transformers] - an array or arguments list of transformers
* @return {Function} - a template tag
*/
function TemplateTag() {
var _this = this;
for (var _len = arguments.length, transformers = Array(_len), _key = 0; _key < _len; _key++) {
transformers[_key] = arguments[_key];
}
_classCallCheck(this, TemplateTag);
this.tag = function (strings) {
for (var _len2 = arguments.length, expressions = Array(_len2 > 1 ? _len2 - 1 : 0), _key2 = 1; _key2 < _len2; _key2++) {
expressions[_key2 - 1] = arguments[_key2];
}
if (typeof strings === 'function') {
// if the first argument passed is a function, assume it is a template tag and return
// an intermediary tag that processes the template using the aforementioned tag, passing the
// result to our tag
return _this.interimTag.bind(_this, strings);
}
if (typeof strings === 'string') {
// if the first argument passed is a string, just transform it
return _this.transformEndResult(strings);
}
// else, return a transformed end result of processing the template with our tag
strings = strings.map(_this.transformString.bind(_this));
return _this.transformEndResult(strings.reduce(_this.processSubstitutions.bind(_this, expressions)));
};
// if first argument is an array, extrude it as a list of transformers
if (transformers.length > 0 && Array.isArray(transformers[0])) {
transformers = transformers[0];
}
// if any transformers are functions, this means they are not initiated - automatically initiate them
this.transformers = transformers.map(function (transformer) {
return typeof transformer === 'function' ? transformer() : transformer;
});
// return an ES2015 template tag
return this.tag;
}
/**
* Applies all transformers to a template literal tagged with this method.
* If a function is passed as the first argument, assumes the function is a template tag
* and applies it to the template, returning a template tag.
* @param {(Function|String|Array<String>)} strings - Either a template tag or an array containing template strings separated by identifier
* @param {...*} ...expressions - Optional list of substitution values.
* @return {(String|Function)} - Either an intermediary tag function or the results of processing the template.
*/
_createClass(TemplateTag, [{
key: 'interimTag',
/**
* An intermediary template tag that receives a template tag and passes the result of calling the template with the received
* template tag to our own template tag.
* @param {Function} nextTag - the received template tag
* @param {Array<String>} template - the template to process
* @param {...*} ...substitutions - `substitutions` is an array of all substitutions in the template
* @return {*} - the final processed value
*/
value: function interimTag(previousTag, template) {
for (var _len3 = arguments.length, substitutions = Array(_len3 > 2 ? _len3 - 2 : 0), _key3 = 2; _key3 < _len3; _key3++) {
substitutions[_key3 - 2] = arguments[_key3];
}
return this.tag(_templateObject, previousTag.apply(undefined, [template].concat(substitutions)));
}
/**
* Performs bulk processing on the tagged template, transforming each substitution and then
* concatenating the resulting values into a string.
* @param {Array<*>} substitutions - an array of all remaining substitutions present in this template
* @param {String} resultSoFar - this iteration's result string so far
* @param {String} remainingPart - the template chunk after the current substitution
* @return {String} - the result of joining this iteration's processed substitution with the result
*/
}, {
key: 'processSubstitutions',
value: function processSubstitutions(substitutions, resultSoFar, remainingPart) {
var substitution = this.transformSubstitution(substitutions.shift(), resultSoFar);
return ''.concat(resultSoFar, substitution, remainingPart);
}
/**
* Iterate through each transformer, applying the transformer's `onString` method to the template
* strings before all substitutions are processed.
* @param {String} str - The input string
* @return {String} - The final results of processing each transformer
*/
}, {
key: 'transformString',
value: function transformString(str) {
var cb = function cb(res, transform) {
return transform.onString ? transform.onString(res) : res;
};
return this.transformers.reduce(cb, str);
}
/**
* When a substitution is encountered, iterates through each transformer and applies the transformer's
* `onSubstitution` method to the substitution.
* @param {*} substitution - The current substitution
* @param {String} resultSoFar - The result up to and excluding this substitution.
* @return {*} - The final result of applying all substitution transformations.
*/
}, {
key: 'transformSubstitution',
value: function transformSubstitution(substitution, resultSoFar) {
var cb = function cb(res, transform) {
return transform.onSubstitution ? transform.onSubstitution(res, resultSoFar) : res;
};
return this.transformers.reduce(cb, substitution);
}
/**
* Iterates through each transformer, applying the transformer's `onEndResult` method to the
* template literal after all substitutions have finished processing.
* @param {String} endResult - The processed template, just before it is returned from the tag
* @return {String} - The final results of processing each transformer
*/
}, {
key: 'transformEndResult',
value: function transformEndResult(endResult) {
var cb = function cb(res, transform) {
return transform.onEndResult ? transform.onEndResult(res) : res;
};
return this.transformers.reduce(cb, endResult);
}
}]);
return TemplateTag;
}();
exports.default = TemplateTag;
module.exports = exports['default'];
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transformer() : transformer;\n    });\n\n    // return an ES2015 template tag\n    return this.tag;\n  }\n\n  /**\n   * Applies all transformers to a template literal tagged with this method.\n   * If a function is passed as the first argument, assumes the function is a template tag\n   * and applies it to the template, returning a template tag.\n   * @param  {(Function|String|Array<String>)} strings        - Either a template tag or an array containing template strings separated by identifier\n   * @param  {...*}                            ...expressions - Optional list of substitution values.\n   * @return {(String|Function)}                              - Either an intermediary tag function or the results of processing the template.\n   */\n  tag = (strings, ...expressions) => {\n    if (typeof strings === 'function') {\n      // if the first argument passed is a function, assume it is a template tag and return\n      // an intermediary tag that processes the template using the aforementioned tag, passing the\n      // result to our tag\n      return this.interimTag.bind(this, strings);\n    }\n\n    if (typeof strings === 'string') {\n      // if the first argument passed is a string, just transform it\n      return this.transformEndResult(strings);\n    }\n\n    // else, return a transformed end result of processing the template with our tag\n    strings = strings.map(this.transformString.bind(this));\n    return this.transformEndResult(\n      strings.reduce(this.processSubstitutions.bind(this, expressions)),\n    );\n  };\n\n  /**\n   * An intermediary template tag that receives a template tag and passes the result of calling the template with the received\n   * template tag to our own template tag.\n   * @param  {Function}        nextTag          - the received template tag\n   * @param  {Array<String>}   template         - the template to process\n   * @param  {...*}            ...substitutions - `substitutions` is an array of all substitutions in the template\n   * @return {*}                                - the final processed value\n   */\n  interimTag(previousTag, template, ...substitutions) {\n    return this.tag`${previousTag(template, ...substitutions)}`;\n  }\n\n  /**\n   * Performs bulk processing on the tagged template, transforming each substitution and then\n   * concatenating the resulting values into a string.\n   * @param  {Array<*>} substitutions - an array of all remaining substitutions present in this template\n   * @param  {String}   resultSoFar   - this iteration's result string so far\n   * @param  {String}   remainingPart - the template chunk after the current substitution\n   * @return {String}                 - the result of joining this iteration's processed substitution with the result\n   */\n  processSubstitutions(substitutions, resultSoFar, remainingPart) {\n    const substitution = this.transformSubstitution(\n      substitutions.shift(),\n      resultSoFar,\n    );\n    return ''.concat(resultSoFar, substitution, remainingPart);\n  }\n\n  /**\n   * Iterate through each transformer, applying the transformer's `onString` method to the template\n   * strings before all substitutions are processed.\n   * @param {String}  str - The input string\n   * @return {String}     - The final results of processing each transformer\n   */\n  transformString(str) {\n    const cb = (res, transform) =>\n      transform.onString ? transform.onString(res) : res;\n    return this.transformers.reduce(cb, str);\n  }\n\n  /**\n   * When a substitution is encountered, iterates through each transformer and applies the transformer's\n   * `onSubstitution` method to the substitution.\n   * @param  {*}      substitution - The current substitution\n   * @param  {String} resultSoFar  - The result up to and excluding this substitution.\n   * @return {*}                   - The final result of applying all substitution transformations.\n   */\n  transformSubstitution(substitution, resultSoFar) {\n    const cb = (res, transform) =>\n      transform.onSubstitution\n        ? transform.onSubstitution(res, resultSoFar)\n        : res;\n    return this.transformers.reduce(cb, substitution);\n  }\n\n  /**\n   * Iterates through each transformer, applying the transformer's `onEndResult` method to the\n   * template literal after all substitutions have finished processing.\n   * @param  {String} endResult - The processed template, just before it is returned from the tag\n   * @return {String}           - The final results of processing each transformer\n   */\n  transformEndResult(endResult) {\n    const cb = (res, transform) =>\n      transform.onEndResult ? transform.onEndResult(res) : res;\n    return this.transformers.reduce(cb, endResult);\n  }\n}\n"]}