From cf2c56c7061b7ed40fdd3b40a352ddb9c9b7371f Mon Sep 17 00:00:00 2001
From: alexwl <alexey.a.kiryushin@gmail.com>
Date: Tue, 2 Oct 2018 13:17:04 +0300
Subject: Initial commit

---
 javascript/app/utils/line-selection.js | 111 +++++++++++++++++++++++++++++++++
 1 file changed, 111 insertions(+)
 create mode 100644 javascript/app/utils/line-selection.js

(limited to 'javascript/app/utils/line-selection.js')

diff --git a/javascript/app/utils/line-selection.js b/javascript/app/utils/line-selection.js
new file mode 100644
index 0000000..d6d0976
--- /dev/null
+++ b/javascript/app/utils/line-selection.js
@@ -0,0 +1,111 @@
+function initializeLineSelection(sourceCodeContainerElement,component) {
+  const lineNumbers = Array.prototype.slice.call(sourceCodeContainerElement.querySelectorAll("td.line-number"));
+  if(lineNumbers.length > 0) {
+    const onhashchange = function () {
+      highlightSelectedLines(sourceCodeContainerElement);
+    }
+    window.addEventListener("hashchange",onhashchange);
+    component._onhashchange = onhashchange;
+    
+    let shiftPressed;
+    const onkeydown = function (event) {
+      if(event.keyCode === 16) { shiftPressed = true; }
+    };
+    const onkeyup = function (event) {
+      if(event.keyCode === 16) { shiftPressed = false; }
+    };
+    
+    document.addEventListener('keydown',onkeydown);
+    document.addEventListener('keyup',onkeyup);
+    component._onkeydown = onkeydown;
+    component._onkeyup = onkeyup;
+    
+    let selectedLine1,selectedLine2;
+    lineNumbers.forEach((lineNumberElement) => {
+      lineNumberElement.onclick = function()  {
+        const number = parseInt(this.textContent);
+        if(shiftPressed && selectedLine1) {
+          if(selectedLine1 != number) {
+            selectedLine2 = number;
+            if(selectedLine1 < selectedLine2) {
+              highlightLines(sourceCodeContainerElement,selectedLine1,selectedLine2);
+              window.location.hash = "L"+selectedLine1+"-L"+selectedLine2;
+            } else {
+              highlightLines(sourceCodeContainerElement,selectedLine2,selectedLine1);
+              window.location.hash = "L"+selectedLine2+"-L"+selectedLine1;
+            }
+          }
+        } else {          
+          selectedLine1 = number;
+          selectedLine2 = null;
+          highlightLines(sourceCodeContainerElement,selectedLine1,selectedLine1);
+          window.location.hash = "L"+number;
+        }
+      }
+    });
+    const lines = highlightSelectedLines(sourceCodeContainerElement);    
+    if(lines.length) {
+      selectedLine1 = lines[0];
+      selectedLine2 = lines[1];
+    }    
+  }
+}
+
+function highlightSelectedLines (sourceCodeContainerElement) {
+  const lineInfo = window.location.hash.slice(1);
+  if(lineInfo) {
+    if(lineInfo.includes('-')) {
+      const lines = lineInfo.split("-");
+      const lineNumber1 = parseInt(lines[0].substring(1));
+      const lineNumber2 = parseInt(lines[1].substring(1));
+      if(lineNumber1 && lineNumber2 && lineNumber1 <= lineNumber2) {
+        highlightLines(sourceCodeContainerElement,lineNumber1,lineNumber2);
+        const line = sourceCodeContainerElement.querySelector("td#LC"+lineNumber1);
+        if(line) {
+          scrollLineIntoView(line,sourceCodeContainerElement);
+        }
+        return [lineNumber1,lineNumber2];
+      }
+    } else {
+      const lineNumber = parseInt(lineInfo.substring(1));
+      if(lineNumber) {
+        highlightLines(sourceCodeContainerElement,lineNumber,lineNumber);
+        const line = sourceCodeContainerElement.querySelector("td#LC"+lineNumber);
+        if(line) {
+          scrollLineIntoView(line,sourceCodeContainerElement);
+        }
+        return [lineNumber];
+      }
+    }
+  } else {
+    highlightLines(sourceCodeContainerElement,0,0);
+    return [];
+  }
+}
+
+function scrollLineIntoView(lineElement,sourceCodeContainerElement) {
+  lineElement.parentNode.scrollIntoView();
+  const container = sourceCodeContainerElement.parentNode.parentNode;          
+  const windowHeight = container.offsetHeight;
+  const fullHeight = sourceCodeContainerElement.offsetHeight;
+
+  if(fullHeight - container.scrollTop > windowHeight) {    
+    container.scrollTop = container.scrollTop - (windowHeight/2 - 20);
+  }
+}
+
+function highlightLines(parentElement,startLine,endLine) {  
+  const lineElements = Array.prototype.slice.call(parentElement.querySelectorAll("td.line-content"));
+  lineElements.forEach((lineElement) => {  
+    const number = parseInt(lineElement.id.substring(2)); //<td "id"="LC10">...</td>
+    if(number >= startLine && number <= endLine) {
+      lineElement.classList.add('highlighted-line');
+    } else {
+      lineElement.classList.remove('highlighted-line');
+    }
+  });
+}
+
+export {
+  initializeLineSelection,highlightLines,highlightSelectedLines
+}
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