Implement reporter for csslint engine (#282)

Author: romanrostislavovich

engine/csslint/pipe.json

@@ -0,0 +1,24 @@
+{
+    "$schema": "https://repometric.github.io/linterhub/schema/extr.json",
+    "id": "csslint",
+    "name": "csslint",
+    "pipeline": [
+        {
+            "cmd": "csslint",
+            "success": 1,
+            "engine": true,
+			"args": {
+				"--format":"compact"
+			}
+        },
+        {
+            "cmd": "node",
+			"args": "{{hub}}/{{engine}}/reporter.js",
+			"success": 2
+        }
+    ],
+    "environment": {
+        "masks": false,
+        "version": "v1.0.5"
+    }
+}

engine/csslint/reporter.js

@@ -0,0 +1,81 @@
+
+const template = module.exports = {
+    run: (onFinish) => {
+        process.stdin.resume();
+        process.stdin.setEncoding("utf8");
+
+        var lingeringLine = "";
+        var lines = [];
+
+        process.stdin.on("data", (chunk) => {
+            let linesParsed = chunk.split("\n");
+            linesParsed[0] = lingeringLine + linesParsed[0];
+            lingeringLine = linesParsed.pop();
+            linesParsed.forEach((line) => {
+                if (line !== null) {
+                    lines.push(line);
+                }
+            });
+        });
+
+        process.stdin.on("end", () => {
+            onFinish(lines);
+        });
+    },
+};
+
+const regex = /(.*): line ([0-9]+), col ([0-9]+), (.*) - (.*) \((.*)\)/g;
+
+const reporter = module.exports = {
+    run: (regex, convertMatch) => {
+
+        const results = [];
+
+        /**
+         * Generates standard model form each line
+         * @param {*} line Line to parse
+         */
+        function processLine(line) {
+            const match = new RegExp(regex).exec(line);
+
+            if (match === null) {
+                return;
+            }
+
+            const objParsed = convertMatch(match);
+
+            let obj = results.find((element) => {
+                return objParsed.path === element.path;
+            });
+
+            if (obj === "undefined") {
+                obj = {
+                    path: objParsed.path,
+                    messages: [],
+                };
+                results.push(obj);
+            }
+
+            obj.messages.push(objParsed.message);
+        }
+
+        template.run((lines) => {
+            lines.forEach(processLine);
+            console.log(JSON.stringify(results));
+        });
+    },
+};
+
+reporter.run(regex, (match) => {
+    return {
+        path: match[1],
+        message: {
+            message: match[5],
+            severity: match[4].toLowerCase(),
+            line: match[2],
+            lineEnd: match[2],
+            column: match[3],
+            ruleName: match[6],
+        },
+    };
+});