Merge branch 'tlwr-feature-select-lines-op'

src/core/config/Categories.js

@@ -162,6 +162,8 @@ const Categories = [
  "Unique",
  "Split",
  "Filter",
+ "Head",
+ "Tail",
  "Count occurrences",
  "Expand alphabet range",
  "Parse escaped string",

src/core/config/OperationConfig.js

@@ -3196,7 +3196,59 @@ const OperationConfig = {
  outputType: "html",
  args: [
  ]
- }
+ },
+ "Head": {
+ description: [
+ "Like the UNIX head utility.",
+ "<br>",
+ "Gets the first n lines.",
+ "<br>",
+ "You can select all but the last n lines by entering a negative value for n.",
+ "<br>",
+ "The delimiter can be changed so that instead of lines, fields (i.e. commas) are selected instead.",
+ ].join("\n"),
+ run: StrUtils.runHead,
+ inputType: "string",
+ outputType: "string",
+ args: [
+ {
+ name: "Delimiter",
+ type: "option",
+ value: StrUtils.DELIMITER_OPTIONS
+ },
+ {
+ name: "Number",
+ type: "number",
+ value: 10,
+ },
+ ]
+ },
+ "Tail": {
+ description: [
+ "Like the UNIX tail utility.",
+ "<br>",
+ "Gets the last n lines.",
+ "<br>",
+ "Optionally you can select all lines after line n by entering a negative value for n.",
+ "<br>",
+ "The delimiter can be changed so that instead of lines, fields (i.e. commas) are selected instead.",
+ ].join("\n"),
+ run: StrUtils.runTail,
+ inputType: "string",
+ outputType: "string",
+ args: [
+ {
+ name: "Delimiter",
+ type: "option",
+ value: StrUtils.DELIMITER_OPTIONS
+ },
+ {
+ name: "Number",
+ type: "number",
+ value: 10,
+ },
+ ]
+ },
 };
 
 export default OperationConfig;

src/core/operations/StrUtils.js

@@ -460,6 +460,62 @@ const StrUtils = {
  },
 
 
+ /**
+ * Head lines operation.
+ *
+ * @param {string} input
+ * @param {Object[]} args
+ * @returns {string}
+ */
+ runHead: function(input, args) {
+ let delimiter = args[0],
+ number = args[1];
+
+ delimiter = Utils.charRep[delimiter];
+ let splitInput = input.split(delimiter);
+
+ return splitInput
+ .filter((line, lineIndex) => {
+ lineIndex += 1;
+
+ if (number < 0) {
+ return lineIndex <= splitInput.length + number;
+ } else {
+ return lineIndex <= number;
+ }
+ })
+ .join(delimiter);
+ },
+
+
+ /**
+ * Tail lines operation.
+ *
+ * @param {string} input
+ * @param {Object[]} args
+ * @returns {string}
+ */
+ runTail: function(input, args) {
+ let delimiter = args[0],
+ number = args[1];
+
+ delimiter = Utils.charRep[delimiter];
+ let splitInput = input.split(delimiter);
+
+ return splitInput
+ .filter((line, lineIndex) => {
+ lineIndex += 1;
+
+ if (number < 0) {
+ return lineIndex > -number;
+ } else {
+ return lineIndex > splitInput.length - number;
+ }
+ })
+ .join(delimiter);
+ },
+
+
  /**
  * Adds HTML highlights to matches within a string.
  *

test/tests/operations/StrUtils.js

@@ -34,4 +34,202 @@ TestRegister.addTests([
  }
  ],
  },
+ {
+ name: "Head 0",
+ input: [1, 2, 3, 4, 5, 6].join("\n"),
+ expectedOutput: [].join("\n"),
+ recipeConfig: [
+ {
+ "op": "Head",
+ "args": ["Line feed", 0]
+ }
+ ],
+ },
+ {
+ name: "Head 1",
+ input: [1, 2, 3, 4, 5, 6].join("\n"),
+ expectedOutput: [1].join("\n"),
+ recipeConfig: [
+ {
+ "op": "Head",
+ "args": ["Line feed", 1]
+ }
+ ],
+ },
+ {
+ name: "Head 2",
+ input: [1, 2, 3, 4, 5, 6].join("\n"),
+ expectedOutput: [1, 2].join("\n"),
+ recipeConfig: [
+ {
+ "op": "Head",
+ "args": ["Line feed", 2]
+ }
+ ],
+ },
+ {
+ name: "Head 6",
+ input: [1, 2, 3, 4, 5, 6].join("\n"),
+ expectedOutput: [1, 2, 3, 4, 5, 6].join("\n"),
+ recipeConfig: [
+ {
+ "op": "Head",
+ "args": ["Line feed", 6]
+ }
+ ],
+ },
+ {
+ name: "Head big",
+ input: [1, 2, 3, 4, 5, 6].join("\n"),
+ expectedOutput: [1, 2, 3, 4, 5, 6].join("\n"),
+ recipeConfig: [
+ {
+ "op": "Head",
+ "args": ["Line feed", 100]
+ }
+ ],
+ },
+ {
+ name: "Head all but 1",
+ input: [1, 2, 3, 4, 5, 6].join("\n"),
+ expectedOutput: [1, 2, 3, 4, 5].join("\n"),
+ recipeConfig: [
+ {
+ "op": "Head",
+ "args": ["Line feed", -1]
+ }
+ ],
+ },
+ {
+ name: "Head all but 2",
+ input: [1, 2, 3, 4, 5, 6].join("\n"),
+ expectedOutput: [1, 2, 3, 4].join("\n"),
+ recipeConfig: [
+ {
+ "op": "Head",
+ "args": ["Line feed", -2]
+ }
+ ],
+ },
+ {
+ name: "Head all but 6",
+ input: [1, 2, 3, 4, 5, 6].join("\n"),
+ expectedOutput: [].join("\n"),
+ recipeConfig: [
+ {
+ "op": "Head",
+ "args": ["Line feed", -6]
+ }
+ ],
+ },
+ {
+ name: "Head all but big",
+ input: [1, 2, 3, 4, 5, 6].join("\n"),
+ expectedOutput: [].join("\n"),
+ recipeConfig: [
+ {
+ "op": "Head",
+ "args": ["Line feed", -100]
+ }
+ ],
+ },
+ {
+ name: "Tail 0",
+ input: [1, 2, 3, 4, 5, 6].join("\n"),
+ expectedOutput: [].join("\n"),
+ recipeConfig: [
+ {
+ "op": "Tail",
+ "args": ["Line feed", 0]
+ }
+ ],
+ },
+ {
+ name: "Tail 1",
+ input: [1, 2, 3, 4, 5, 6].join("\n"),
+ expectedOutput: [6].join("\n"),
+ recipeConfig: [
+ {
+ "op": "Tail",
+ "args": ["Line feed", 1]
+ }
+ ],
+ },
+ {
+ name: "Tail 2",
+ input: [1, 2, 3, 4, 5, 6].join("\n"),
+ expectedOutput: [5, 6].join("\n"),
+ recipeConfig: [
+ {
+ "op": "Tail",
+ "args": ["Line feed", 2]
+ }
+ ],
+ },
+ {
+ name: "Tail 6",
+ input: [1, 2, 3, 4, 5, 6].join("\n"),
+ expectedOutput: [1, 2, 3, 4, 5, 6].join("\n"),
+ recipeConfig: [
+ {
+ "op": "Tail",
+ "args": ["Line feed", 6]
+ }
+ ],
+ },
+ {
+ name: "Tail big",
+ input: [1, 2, 3, 4, 5, 6].join("\n"),
+ expectedOutput: [1, 2, 3, 4, 5, 6].join("\n"),
+ recipeConfig: [
+ {
+ "op": "Tail",
+ "args": ["Line feed", 100]
+ }
+ ],
+ },
+ {
+ name: "Tail all but 1",
+ input: [1, 2, 3, 4, 5, 6].join("\n"),
+ expectedOutput: [2, 3, 4, 5, 6].join("\n"),
+ recipeConfig: [
+ {
+ "op": "Tail",
+ "args": ["Line feed", -1]
+ }
+ ],
+ },
+ {
+ name: "Tail all but 2",
+ input: [1, 2, 3, 4, 5, 6].join("\n"),
+ expectedOutput: [3, 4, 5, 6].join("\n"),
+ recipeConfig: [
+ {
+ "op": "Tail",
+ "args": ["Line feed", -2]
+ }
+ ],
+ },
+ {
+ name: "Tail all but 6",
+ input: [1, 2, 3, 4, 5, 6].join("\n"),
+ expectedOutput: [].join("\n"),
+ recipeConfig: [
+ {
+ "op": "Tail",
+ "args": ["Line feed", -6]
+ }
+ ],
+ },
+ {
+ name: "Tail all but big",
+ input: [1, 2, 3, 4, 5, 6].join("\n"),
+ expectedOutput: [].join("\n"),
+ recipeConfig: [
+ {
+ "op": "Tail",
+ "args": ["Line feed", -100]
+ }
+ ],
+ },
 ]);