Add Head and Tail operations
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toby
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07bb095e73
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dea214bd2e
@ -3196,7 +3196,69 @@ const OperationConfig = {
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outputType: "html",
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args: [
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]
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}
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},
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"Head": {
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description: [
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"Like the UNIX head utility.",
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"<br>",
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"Gets the first $Number of lines.",
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"<br>",
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"Optionally you can select all but the last $Number of lines.",
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"<br>",
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"The delimiter can be changed so that instead of lines, fields (i.e. commas) are selected instead.",
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].join("\n"),
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run: StrUtils.runHead,
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inputType: "string",
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outputType: "string",
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args: [
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{
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name: "Delimiter",
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type: "option",
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value: StrUtils.DELIMITER_OPTIONS
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},
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{
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name: "Number",
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type: "number",
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value: 10,
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},
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{
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name: "All but last $Number of lines",
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type: "boolean",
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value: false,
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},
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]
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},
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"Tail": {
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description: [
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"Like the UNIX tail utility.",
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"<br>",
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"Gets the last $Number of lines.",
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"<br>",
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"Optionally you can select all lines after line $Number.",
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"<br>",
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"The delimiter can be changed so that instead of lines, fields (i.e. commas) are selected instead.",
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].join("\n"),
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run: StrUtils.runTail,
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inputType: "string",
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outputType: "string",
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args: [
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{
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name: "Delimiter",
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type: "option",
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value: StrUtils.DELIMITER_OPTIONS
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},
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{
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name: "Number",
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type: "number",
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value: 10,
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},
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{
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name: "Start from line $Number",
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type: "boolean",
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value: false,
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},
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]
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},
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};
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export default OperationConfig;
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@ -537,6 +537,61 @@ const StrUtils = {
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return output;
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},
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/**
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* Head lines operation.
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*
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* @param {string} input
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* @param {Object[]} args
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* @returns {string}
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*/
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runHead: function(input, args) {
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let delimiter = args[0],
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number = args[1],
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allBut = args[2];
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delimiter = Utils.charRep[delimiter];
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let splitInput = input.split(delimiter);
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return splitInput
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.filter((line, lineIndex) => {
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lineIndex += 1;
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if (allBut) {
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return lineIndex <= splitInput.length - number;
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} else {
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return lineIndex <= number;
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}
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})
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.join(delimiter);
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},
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/**
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* Tail lines operation.
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*
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* @param {string} input
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* @param {Object[]} args
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* @returns {string}
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*/
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runTail: function(input, args) {
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let delimiter = args[0],
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number = args[1],
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allBut = args[2];
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delimiter = Utils.charRep[delimiter];
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let splitInput = input.split(delimiter);
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return splitInput
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.filter((line, lineIndex) => {
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lineIndex += 1;
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if (allBut) {
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return lineIndex >= number;
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} else {
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return lineIndex > splitInput.length - number;
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}
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})
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.join(delimiter);
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},
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};
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export default StrUtils;
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@ -34,4 +34,224 @@ TestRegister.addTests([
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}
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],
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},
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{
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name: "Head 0",
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input: [1, 2, 3, 4, 5, 6].join("\n"),
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expectedOutput: [].join("\n"),
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recipeConfig: [
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{
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"op": "Head",
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"args": ["Line feed", 0, false]
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}
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],
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},
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{
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name: "Head 1",
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input: [1, 2, 3, 4, 5, 6].join("\n"),
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expectedOutput: [1].join("\n"),
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recipeConfig: [
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{
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"op": "Head",
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"args": ["Line feed", 1, false]
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}
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],
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},
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{
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name: "Head 2",
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input: [1, 2, 3, 4, 5, 6].join("\n"),
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expectedOutput: [1, 2].join("\n"),
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recipeConfig: [
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{
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"op": "Head",
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"args": ["Line feed", 2, false]
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}
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],
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},
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{
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name: "Head 6",
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input: [1, 2, 3, 4, 5, 6].join("\n"),
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expectedOutput: [1, 2, 3, 4, 5, 6].join("\n"),
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recipeConfig: [
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{
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"op": "Head",
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"args": ["Line feed", 6, false]
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}
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],
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},
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{
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name: "Head big",
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input: [1, 2, 3, 4, 5, 6].join("\n"),
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expectedOutput: [1, 2, 3, 4, 5, 6].join("\n"),
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recipeConfig: [
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{
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"op": "Head",
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"args": ["Line feed", 100, false]
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}
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],
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},
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{
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name: "Head all but 0",
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input: [1, 2, 3, 4, 5, 6].join("\n"),
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expectedOutput: [1, 2, 3, 4, 5, 6].join("\n"),
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recipeConfig: [
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{
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"op": "Head",
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"args": ["Line feed", 0, true]
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}
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],
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},
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{
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name: "Head all but 1",
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input: [1, 2, 3, 4, 5, 6].join("\n"),
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expectedOutput: [1, 2, 3, 4, 5].join("\n"),
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recipeConfig: [
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{
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"op": "Head",
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"args": ["Line feed", 1, true]
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}
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],
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},
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{
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name: "Head all but 2",
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input: [1, 2, 3, 4, 5, 6].join("\n"),
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expectedOutput: [1, 2, 3, 4].join("\n"),
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recipeConfig: [
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{
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"op": "Head",
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"args": ["Line feed", 2, true]
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}
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],
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},
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{
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name: "Head all but 6",
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input: [1, 2, 3, 4, 5, 6].join("\n"),
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expectedOutput: [].join("\n"),
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recipeConfig: [
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{
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"op": "Head",
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"args": ["Line feed", 6, true]
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}
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],
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},
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{
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name: "Head all but big",
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input: [1, 2, 3, 4, 5, 6].join("\n"),
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expectedOutput: [].join("\n"),
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recipeConfig: [
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{
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"op": "Head",
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"args": ["Line feed", 100, true]
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}
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],
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},
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{
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name: "Tail 0",
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input: [1, 2, 3, 4, 5, 6].join("\n"),
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expectedOutput: [].join("\n"),
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recipeConfig: [
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{
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"op": "Tail",
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"args": ["Line feed", 0, false]
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}
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],
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},
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{
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name: "Tail 1",
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input: [1, 2, 3, 4, 5, 6].join("\n"),
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expectedOutput: [6].join("\n"),
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recipeConfig: [
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{
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"op": "Tail",
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"args": ["Line feed", 1, false]
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}
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],
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},
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{
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name: "Tail 2",
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input: [1, 2, 3, 4, 5, 6].join("\n"),
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expectedOutput: [5, 6].join("\n"),
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recipeConfig: [
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{
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"op": "Tail",
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"args": ["Line feed", 2, false]
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}
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],
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},
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{
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name: "Tail 6",
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input: [1, 2, 3, 4, 5, 6].join("\n"),
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expectedOutput: [1, 2, 3, 4, 5, 6].join("\n"),
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recipeConfig: [
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{
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"op": "Tail",
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"args": ["Line feed", 6, false]
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}
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],
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},
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{
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name: "Tail big",
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input: [1, 2, 3, 4, 5, 6].join("\n"),
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expectedOutput: [1, 2, 3, 4, 5, 6].join("\n"),
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recipeConfig: [
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{
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"op": "Tail",
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"args": ["Line feed", 100, false]
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}
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],
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},
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{
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name: "Tail all but 0",
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input: [1, 2, 3, 4, 5, 6].join("\n"),
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expectedOutput: [1, 2, 3, 4, 5, 6].join("\n"),
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recipeConfig: [
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{
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"op": "Tail",
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"args": ["Line feed", 0, true]
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}
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],
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},
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{
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name: "Tail all but 1",
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input: [1, 2, 3, 4, 5, 6].join("\n"),
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expectedOutput: [1, 2, 3, 4, 5, 6].join("\n"),
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recipeConfig: [
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{
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"op": "Tail",
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"args": ["Line feed", 1, true]
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}
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],
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},
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{
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name: "Tail all but 2",
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input: [1, 2, 3, 4, 5, 6].join("\n"),
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expectedOutput: [2, 3, 4, 5, 6].join("\n"),
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recipeConfig: [
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{
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"op": "Tail",
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"args": ["Line feed", 2, true]
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}
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],
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},
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{
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name: "Tail all but 6",
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input: [1, 2, 3, 4, 5, 6].join("\n"),
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expectedOutput: [6].join("\n"),
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recipeConfig: [
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{
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"op": "Tail",
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"args": ["Line feed", 6, true]
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}
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],
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},
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{
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name: "Tail all but big",
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input: [1, 2, 3, 4, 5, 6].join("\n"),
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expectedOutput: [].join("\n"),
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recipeConfig: [
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{
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"op": "Tail",
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"args": ["Line feed", 100, true]
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}
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],
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},
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]);
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