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-rw-r--r--ext/js/dom/dom-text-scanner.js142
1 files changed, 69 insertions, 73 deletions
diff --git a/ext/js/dom/dom-text-scanner.js b/ext/js/dom/dom-text-scanner.js
index a81d6b4f..fff08825 100644
--- a/ext/js/dom/dom-text-scanner.js
+++ b/ext/js/dom/dom-text-scanner.js
@@ -44,7 +44,7 @@ class DOMTextScanner {
/**
* Gets the current node being scanned.
- * @returns A DOM Node.
+ * @type {Node}
*/
get node() {
return this._node;
@@ -53,7 +53,7 @@ class DOMTextScanner {
/**
* Gets the current offset corresponding to the node being scanned.
* This value is only applicable for text nodes.
- * @returns An integer.
+ * @type {number}
*/
get offset() {
return this._offset;
@@ -62,7 +62,7 @@ class DOMTextScanner {
/**
* Gets the remaining number of characters that weren't scanned in the last seek() call.
* This value is usually 0 unless the end of the document was reached.
- * @returns An integer.
+ * @type {number}
*/
get remainder() {
return this._remainder;
@@ -70,7 +70,7 @@ class DOMTextScanner {
/**
* Gets the accumulated content string resulting from calls to seek().
- * @returns A string.
+ * @type {string}
*/
get content() {
return this._content;
@@ -78,11 +78,11 @@ class DOMTextScanner {
/**
* Seeks a given length in the document and accumulates the text content.
- * @param length A positive or negative integer corresponding to how many characters
+ * @param {number} length A positive or negative integer corresponding to how many characters
* should be added to content. Content is only added to the accumulation string,
* never removed, so mixing seek calls with differently signed length values
* may give unexpected results.
- * @returns this
+ * @returns {DOMTextScanner} this
*/
seek(length) {
const forward = (length >= 0);
@@ -114,7 +114,7 @@ class DOMTextScanner {
} else if (nodeType === ELEMENT_NODE) {
lastNode = node;
this._offset = 0;
- [enterable, newlines] = DOMTextScanner.getElementSeekInfo(node);
+ ({enterable, newlines} = DOMTextScanner.getElementSeekInfo(node));
if (newlines > this._newlines && generateLayoutContent) {
this._newlines = newlines;
}
@@ -125,7 +125,7 @@ class DOMTextScanner {
for (const exitedNode of exitedNodes) {
if (exitedNode.nodeType !== ELEMENT_NODE) { continue; }
- newlines = DOMTextScanner.getElementSeekInfo(exitedNode)[1];
+ ({newlines} = DOMTextScanner.getElementSeekInfo(exitedNode));
if (newlines > this._newlines && generateLayoutContent) {
this._newlines = newlines;
}
@@ -144,18 +144,14 @@ class DOMTextScanner {
/**
* Seeks forward in a text node.
- * @param textNode The text node to use.
- * @param resetOffset Whether or not the text offset should be reset.
- * @returns true if scanning should continue, or false if the scan length has been reached.
+ * @param {Text} textNode The text node to use.
+ * @param {boolean} resetOffset Whether or not the text offset should be reset.
+ * @returns {boolean} `true` if scanning should continue, or `false` if the scan length has been reached.
*/
_seekTextNodeForward(textNode, resetOffset) {
const nodeValue = textNode.nodeValue;
const nodeValueLength = nodeValue.length;
- const [preserveNewlines, preserveWhitespace] = (
- this._forcePreserveWhitespace ?
- [true, true] :
- DOMTextScanner.getWhitespaceSettings(textNode)
- );
+ const {preserveNewlines, preserveWhitespace} = this._getWhitespaceSettings(textNode);
let lineHasWhitespace = this._lineHasWhitespace;
let lineHasContent = this._lineHasContent;
@@ -234,18 +230,14 @@ class DOMTextScanner {
* - offset is decremented before getting the character.
* - offset is reverted by incrementing instead of decrementing.
* - content string is prepended instead of appended.
- * @param textNode The text node to use.
- * @param resetOffset Whether or not the text offset should be reset.
- * @returns true if scanning should continue, or false if the scan length has been reached.
+ * @param {Text} textNode The text node to use.
+ * @param {boolean} resetOffset Whether or not the text offset should be reset.
+ * @returns {boolean} `true` if scanning should continue, or `false` if the scan length has been reached.
*/
_seekTextNodeBackward(textNode, resetOffset) {
const nodeValue = textNode.nodeValue;
const nodeValueLength = nodeValue.length;
- const [preserveNewlines, preserveWhitespace] = (
- this._forcePreserveWhitespace ?
- [true, true] :
- DOMTextScanner.getWhitespaceSettings(textNode)
- );
+ const {preserveNewlines, preserveWhitespace} = this._getWhitespaceSettings(textNode);
let lineHasWhitespace = this._lineHasWhitespace;
let lineHasContent = this._lineHasContent;
@@ -315,15 +307,41 @@ class DOMTextScanner {
return (remainder > 0);
}
+ /**
+ * Gets information about how whitespace characters are treated.
+ * @param {Text} textNode The text node to check.
+ * @returns {{preserveNewlines: boolean, preserveWhitespace: boolean}} Information about the whitespace.
+ * The value of `preserveNewlines` indicates whether or not newline characters are treated as line breaks.
+ * The value of `preserveWhitespace` indicates whether or not sequences of whitespace characters are collapsed.
+ */
+ _getWhitespaceSettings(textNode) {
+ if (this._forcePreserveWhitespace) {
+ return {preserveNewlines: true, preserveWhitespace: true};
+ }
+ const element = DOMTextScanner.getParentElement(textNode);
+ if (element !== null) {
+ const style = window.getComputedStyle(element);
+ switch (style.whiteSpace) {
+ case 'pre':
+ case 'pre-wrap':
+ case 'break-spaces':
+ return {preserveNewlines: true, preserveWhitespace: true};
+ case 'pre-line':
+ return {preserveNewlines: true, preserveWhitespace: false};
+ }
+ }
+ return {preserveNewlines: false, preserveWhitespace: false};
+ }
+
// Static helpers
/**
* Gets the next node in the document for a specified scanning direction.
- * @param node The current DOM Node.
- * @param forward Whether to scan forward in the document or backward.
- * @param visitChildren Whether the children of the current node should be visited.
- * @param exitedNodes An array which stores nodes which were exited.
- * @returns The next node in the document, or null if there is no next node.
+ * @param {Node} node The current DOM Node.
+ * @param {boolean} forward Whether to scan forward in the document or backward.
+ * @param {boolean} visitChildren Whether the children of the current node should be visited.
+ * @param {Node[]} exitedNodes An array which stores nodes which were exited.
+ * @returns {?Node} The next node in the document, or `null` if there is no next node.
*/
static getNextNode(node, forward, visitChildren, exitedNodes) {
let next = visitChildren ? (forward ? node.firstChild : node.lastChild) : null;
@@ -345,8 +363,8 @@ class DOMTextScanner {
/**
* Gets the parent element of a given Node.
- * @param node The node to check.
- * @returns The parent element if one exists, otherwise null.
+ * @param {Node} node The node to check.
+ * @returns {?Node} The parent element if one exists, otherwise `null`.
*/
static getParentElement(node) {
while (node !== null && node.nodeType !== Node.ELEMENT_NODE) {
@@ -359,8 +377,8 @@ class DOMTextScanner {
* Gets the parent <ruby> element of a given node, if one exists. For efficiency purposes,
* this only checks the immediate parent elements and does not check all ancestors, so
* there are cases where the node may be in a ruby element but it is not returned.
- * @param node The node to check.
- * @returns A <ruby> node if the input node is contained in one, otherwise null.
+ * @param {Node} node The node to check.
+ * @returns {?HTMLElement} A <ruby> node if the input node is contained in one, otherwise `null`.
*/
static getParentRubyElement(node) {
node = DOMTextScanner.getParentElement(node);
@@ -374,9 +392,10 @@ class DOMTextScanner {
}
/**
- * @returns [enterable: boolean, newlines: integer]
- * The enterable value indicates whether the content of this node should be entered.
- * The newlines value corresponds to the number of newline characters that should be added.
+ * Gets seek information about an element.
+ * @returns {{enterable: boolean, newlines: number}} The seek information.
+ * The `enterable` value indicates whether the content of this node should be entered.
+ * The `newlines` value corresponds to the number of newline characters that should be added.
* 1 newline corresponds to a simple new line in the layout.
* 2 newlines corresponds to a significant visual distinction since the previous content.
*/
@@ -387,9 +406,9 @@ class DOMTextScanner {
case 'RT':
case 'SCRIPT':
case 'STYLE':
- return [false, 0];
+ return {enterable: false, newlines: 0};
case 'BR':
- return [false, 1];
+ return {enterable: false, newlines: 1};
case 'TEXTAREA':
case 'INPUT':
case 'BUTTON':
@@ -418,36 +437,13 @@ class DOMTextScanner {
}
}
- return [enterable, newlines];
- }
-
- /**
- * Gets information about how whitespace characters are treated.
- * @param textNode The Text node to check.
- * @returns [preserveNewlines: boolean, preserveWhitespace: boolean]
- * The value of preserveNewlines indicates whether or not newline characters are treated as line breaks.
- * The value of preserveWhitespace indicates whether or not sequences of whitespace characters are collapsed.
- */
- static getWhitespaceSettings(textNode) {
- const element = DOMTextScanner.getParentElement(textNode);
- if (element !== null) {
- const style = window.getComputedStyle(element);
- switch (style.whiteSpace) {
- case 'pre':
- case 'pre-wrap':
- case 'break-spaces':
- return [true, true];
- case 'pre-line':
- return [true, false];
- }
- }
- return [false, false];
+ return {enterable, newlines};
}
/**
* Gets attributes for the specified character.
- * @param character A string containing a single character.
- * @returns An integer representing the attributes of the character.
+ * @param {string} character A string containing a single character.
+ * @returns {number} An integer representing the attributes of the character.
* 0: Character should be ignored.
* 1: Character is collapsible whitespace.
* 2: Character should be added to the content.
@@ -472,9 +468,9 @@ class DOMTextScanner {
/**
* Checks whether a given style is visible or not.
- * This function does not check style.display === 'none'.
- * @param style An object implementing the CSSStyleDeclaration interface.
- * @returns true if the style should result in an element being visible, otherwise false.
+ * This function does not check `style.display === 'none'`.
+ * @param {CSSStyleDeclaration} style An object implementing the CSSStyleDeclaration interface.
+ * @returns {boolean} `true` if the style should result in an element being visible, otherwise `false`.
*/
static isStyleVisible(style) {
return !(
@@ -493,8 +489,8 @@ class DOMTextScanner {
/**
* Checks whether a given style is selectable or not.
- * @param style An object implementing the CSSStyleDeclaration interface.
- * @returns true if the style is selectable, otherwise false.
+ * @param {CSSStyleDeclaration} style An object implementing the CSSStyleDeclaration interface.
+ * @returns {boolean} `true` if the style is selectable, otherwise `false`.
*/
static isStyleSelectable(style) {
return !(
@@ -507,8 +503,8 @@ class DOMTextScanner {
/**
* Checks whether a CSS color is transparent or not.
- * @param cssColor A CSS color string, expected to be encoded in rgb(a) form.
- * @returns true if the color is transparent, otherwise false.
+ * @param {string} cssColor A CSS color string, expected to be encoded in rgb(a) form.
+ * @returns {false} `true` if the color is transparent, otherwise `false`.
*/
static isCSSColorTransparent(cssColor) {
return (
@@ -520,8 +516,8 @@ class DOMTextScanner {
/**
* Checks whether a CSS display value will cause a layout change for text.
- * @param cssDisplay A CSS string corresponding to the value of the display property.
- * @returns true if the layout is changed by this value, otherwise false.
+ * @param {string} cssDisplay A CSS string corresponding to the value of the display property.
+ * @returns {boolean} `true` if the layout is changed by this value, otherwise `false`.
*/
static doesCSSDisplayChangeLayout(cssDisplay) {
let pos = cssDisplay.indexOf(' ');