Update function documentation

service.js

@@ -357,7 +357,7 @@ class BesService {
   }
 
   /**
-   * Creates grammar mistake markup in DOM and populates collection of highlight rectangles.
+   * Draws grammar mistake markup on canvas and populates collection of highlight rectangles.
    *
    * @param {*} match Grammar checking rule match
    */
@@ -663,21 +663,12 @@ class BesService {
     this.drawSideMarker(markerY1, markerY2)
   }
 
-  static commonPrefixLength(s1, s2) {
+  /**
-    let i = 0
+   * Draws the marker that helps visualize lines of text where grammar mistakes were detected
-    let len = Math.min(s1.length, s2.length)
+   *
-    while (i < len && s1[i] === s2[i]) i++
+   * @param {Number} y1 Marker top [px]
-    return i
+   * @param {Number} y2 Marker bottom [px]
-  }
+   */
-
-  static commonSuffixLength(s1, s2) {
-    let i = 0
-    let i1 = s1.length
-    let i2 = s2.length
-    while (0 < i1-- && 0 < i2-- && s1[i1] === s2[i2]) i++
-    return i
-  }
-
   drawSideMarker(y1, y2) {
     const dpr = window.devicePixelRatio
     const markerX = this.canvasPanel.width - 5 * dpr
@@ -687,6 +678,14 @@ class BesService {
     this.ctx.stroke()
   }
 
+  /**
+   * Draws the missing comma sign
+   *
+   * @param {Number} x Sign center [px]
+   * @param {Number} y Sign bottom [px]
+   * @param {Number} scale Sign scale
+   * @param {String} comment Text to display above the marker
+   */
   drawMissingComma(x, y, scale, comment) {
     const dpr = window.devicePixelRatio
     this.ctx.beginPath()
@@ -703,6 +702,14 @@ class BesService {
     }
   }
 
+  /**
+   * Draws the wrong spacing sign. Control direction of chevrons by reversing y1 and y2.
+   *
+   * @param {Number} x Sign center [px]
+   * @param {Number} y1 Sign top/bottom [px]
+   * @param {Number} y2 Sign bottom/top [px]
+   * @param {Number} scale Sign scale
+   */
   drawWrongSpacing(x, y1, y2, scale) {
     const dpr = window.devicePixelRatio
     this.ctx.beginPath()
@@ -717,6 +724,14 @@ class BesService {
     this.ctx.stroke()
   }
 
+  /**
+   * Strikes out the excessive text
+   *
+   * @param {Number} x1 Strike line start X [px]
+   * @param {Number} y1 Strike line start Y [px]
+   * @param {Number} x2 Strike line end X [px]
+   * @param {Number} y2 Strike line end Y [px]
+   */
   drawExcessiveText(x1, y1, x2, y2) {
     const dpr = window.devicePixelRatio
     this.ctx.beginPath()
@@ -725,6 +740,16 @@ class BesService {
     this.ctx.stroke()
   }
 
+  /**
+   * Strikes out the text and draws the replacement text above
+   *
+   * @param {Number} x1 Strike line start X [px]
+   * @param {Number} y1 Strike line start Y [px]
+   * @param {Number} x2 Strike line end X [px]
+   * @param {Number} y2 Strike line end Y [px]
+   * @param {Number} scale Sign scale
+   * @param {String} text Text to display above
+   */
   drawWrongText(x1, y1, x2, y2, scale, text) {
     const dpr = window.devicePixelRatio
     this.ctx.beginPath()
@@ -749,6 +774,15 @@ class BesService {
     )
   }
 
+  /**
+   * Draws the sign some text is missing
+   *
+   * @param {Number} x Sign center [px]
+   * @param {Number} y1 Sign bottom [px]
+   * @param {Number} y2 Sign top [px]
+   * @param {Number} scale Sign scale
+   * @param {String} text Text to display above
+   */
   drawMissingText(x, y1, y2, scale, text) {
     const dpr = window.devicePixelRatio
     this.ctx.beginPath()
@@ -775,6 +809,14 @@ class BesService {
     )
   }
 
+  /**
+   * Draws zig-zag line
+   *
+   * @param {Number} x1 Sign left [px]
+   * @param {Number} x2 Sign right [px]
+   * @param {Number} y Sign baseline [px]
+   * @param {Number} scale Sign scale
+   */
   drawAttentionRequired(x1, x2, y, scale) {
     const dpr = window.devicePixelRatio
     this.ctx.beginPath()
@@ -788,6 +830,35 @@ class BesService {
     this.ctx.stroke()
   }
 
+  /**
+   * Calculates common string prefix length
+   *
+   * @param {String} s1 First string
+   * @param {String} s2 Second string
+   * @returns Number of characters the beginnings of the strings are equal
+   */
+  static commonPrefixLength(s1, s2) {
+    let i = 0
+    let len = Math.min(s1.length, s2.length)
+    while (i < len && s1[i] === s2[i]) i++
+    return i
+  }
+
+  /**
+   * Calculates common string suffix length
+   *
+   * @param {String} s1 First string
+   * @param {String} s2 Second string
+   * @returns Number of characters the endings of the strings are equal
+   */
+  static commonSuffixLength(s1, s2) {
+    let i = 0
+    let i1 = s1.length
+    let i2 = s2.length
+    while (0 < i1-- && 0 < i2-- && s1[i1] === s2[i2]) i++
+    return i
+  }
+
   /**
    * Tests if given coordinate is inside of a rectangle.
    *
@@ -899,7 +970,7 @@ class BesService {
   }
 
   /**
-   * Removes previously highlighted grammar mistake and highlights new one.
+   * Highlights given grammar mistake.
    *
    * @param {*} match Grammar checking rule match
    */