Created
April 26, 2015 16:28
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Format a string by expanding values mapped with String values in a nested Object.
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| /** | |
| * Expand a string using a supplied regex to denote the properties and a | |
| * possibly nested object to supply the values. | |
| * | |
| * inputString - The string to be formatted. | |
| * valuesObject - An Object holding either values stored as strings or other Objects | |
| * nestSeparator - The marker used to indicated a nested property | |
| * propRegex - Regex used to indicate the property in the inputString. Assumes the actual | |
| * key value will be indicated by using (). | |
| * | |
| * Example: | |
| * expand("A message from afar reads: \"[test.input] [test.input2][pun]\"", | |
| * {test: {input: "Hello", input2: "World"}, pun: "!"}, | |
| * ".", /\[(.*?)\]/g)); | |
| * Output: | |
| * A message from afar reads: "Hello World!" | |
| */ | |
| function expand(inputString, valuesObject, nestSeparator, propRegex) { | |
| function fetchValue(match, nestedProp) { | |
| var propArray = nestedProp.split(nestSeparator), | |
| value = valuesObject, | |
| prop; | |
| for (var i = 0; i < propArray.length; i++) { | |
| prop = propArray[i]; | |
| if (!value[prop]) { | |
| // If property is false-y, supply value as empty string. | |
| value = ""; | |
| break; | |
| } | |
| value = value[prop]; | |
| } | |
| return value; | |
| } | |
| inputString = inputString.replace(propRegex, fetchValue); | |
| return inputString; | |
| } |
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