Move fg/js (#1384)

* Move fg/js/frame-ancestry-handler.js to js/comm/frame-ancestry-handler.js

* Move fg/js/frame-offset-forwarder.js to js/comm/frame-offset-forwarder.js

* Move fg/js/dom-text-scanner.js to js/dom/dom-text-scanner.js

* Move fg/js/text-source-element.js to js/dom/text-source-element.js

* Move fg/js/text-source-range.js to js/dom/text-source-range.js

* Move fg/js/float-main.js to js/display/popup-main.js

* Move fg/js/content-script-main.js to js/app/content-script-main.js

* Move fg/js/frontend.js to js/app/frontend.js

* Move fg/js/popup-factory.js to js/app/popup-factory.js

* Move fg/js/popup-proxy.js to js/app/popup-proxy.js

* Move fg/js/popup-window.js to js/app/popup-window.js

* Move fg/js/popup.js to js/app/popup.js

1 files changed, 0 insertions, 551 deletions

diff --git a/ext/fg/js/dom-text-scanner.js b/ext/fg/js/dom-text-scanner.js
deleted file mode 100644
index 71e74fc3..00000000
--- a/ext/fg/js/dom-text-scanner.js
+++ /dev/null
@@ -1,551 +0,0 @@
-/*
- * Copyright (C) 2020-2021  Yomichan Authors
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-/**
- * A class used to scan text in a document.
- */
-class DOMTextScanner {
-    /**
-     * Creates a new instance of a DOMTextScanner.
-     * @param node The DOM Node to start at.
-     * @param offset The character offset in to start at when node is a text node.
-     *   Use 0 for non-text nodes.
-     */
-    constructor(node, offset, forcePreserveWhitespace=false, generateLayoutContent=true) {
-        const ruby = DOMTextScanner.getParentRubyElement(node);
-        const resetOffset = (ruby !== null);
-        if (resetOffset) { node = ruby; }
-
-        this._node = node;
-        this._offset = offset;
-        this._content = '';
-        this._remainder = 0;
-        this._resetOffset = resetOffset;
-        this._newlines = 0;
-        this._lineHasWhitespace = false;
-        this._lineHasContent = false;
-        this._forcePreserveWhitespace = forcePreserveWhitespace;
-        this._generateLayoutContent = generateLayoutContent;
-    }
-
-    /**
-     * Gets the current node being scanned.
-     * @returns A DOM Node.
-     */
-    get node() {
-        return this._node;
-    }
-
-    /**
-     * Gets the current offset corresponding to the node being scanned.
-     * This value is only applicable for text nodes.
-     * @returns An integer.
-     */
-    get offset() {
-        return this._offset;
-    }
-
-    /**
-     * 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.
-     */
-    get remainder() {
-        return this._remainder;
-    }
-
-    /**
-     * Gets the accumulated content string resulting from calls to seek().
-     * @returns A string.
-     */
-    get content() {
-        return this._content;
-    }
-
-    /**
-     * Seeks a given length in the document and accumulates the text content.
-     * @param 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
-     */
-    seek(length) {
-        const forward = (length >= 0);
-        this._remainder = (forward ? length : -length);
-        if (length === 0) { return this; }
-
-        const TEXT_NODE = Node.TEXT_NODE;
-        const ELEMENT_NODE = Node.ELEMENT_NODE;
-
-        const generateLayoutContent = this._generateLayoutContent;
-        let node = this._node;
-        let lastNode = node;
-        let resetOffset = this._resetOffset;
-        let newlines = 0;
-        while (node !== null) {
-            let enterable = false;
-            const nodeType = node.nodeType;
-
-            if (nodeType === TEXT_NODE) {
-                lastNode = node;
-                if (!(
-                    forward ?
-                    this._seekTextNodeForward(node, resetOffset) :
-                    this._seekTextNodeBackward(node, resetOffset)
-                )) {
-                    // Length reached
-                    break;
-                }
-            } else if (nodeType === ELEMENT_NODE) {
-                lastNode = node;
-                this._offset = 0;
-                [enterable, newlines] = DOMTextScanner.getElementSeekInfo(node);
-                if (newlines > this._newlines && generateLayoutContent) {
-                    this._newlines = newlines;
-                }
-            }
-
-            const exitedNodes = [];
-            node = DOMTextScanner.getNextNode(node, forward, enterable, exitedNodes);
-
-            for (const exitedNode of exitedNodes) {
-                if (exitedNode.nodeType !== ELEMENT_NODE) { continue; }
-                newlines = DOMTextScanner.getElementSeekInfo(exitedNode)[1];
-                if (newlines > this._newlines && generateLayoutContent) {
-                    this._newlines = newlines;
-                }
-            }
-
-            resetOffset = true;
-        }
-
-        this._node = lastNode;
-        this._resetOffset = resetOffset;
-
-        return this;
-    }
-
-    // Private
-
-    /**
-     * 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.
-     */
-    _seekTextNodeForward(textNode, resetOffset) {
-        const nodeValue = textNode.nodeValue;
-        const nodeValueLength = nodeValue.length;
-        const [preserveNewlines, preserveWhitespace] = (
-            this._forcePreserveWhitespace ?
-            [true, true] :
-            DOMTextScanner.getWhitespaceSettings(textNode)
-        );
-
-        let lineHasWhitespace = this._lineHasWhitespace;
-        let lineHasContent = this._lineHasContent;
-        let content = this._content;
-        let offset = resetOffset ? 0 : this._offset;
-        let remainder = this._remainder;
-        let newlines = this._newlines;
-
-        while (offset < nodeValueLength) {
-            const char = nodeValue[offset];
-            const charAttributes = DOMTextScanner.getCharacterAttributes(char, preserveNewlines, preserveWhitespace);
-            ++offset;
-
-            if (charAttributes === 0) {
-                // Character should be ignored
-                continue;
-            } else if (charAttributes === 1) {
-                // Character is collapsable whitespace
-                lineHasWhitespace = true;
-            } else {
-                // Character should be added to the content
-                if (newlines > 0) {
-                    if (content.length > 0) {
-                        const useNewlineCount = Math.min(remainder, newlines);
-                        content += '\n'.repeat(useNewlineCount);
-                        remainder -= useNewlineCount;
-                        newlines -= useNewlineCount;
-                    } else {
-                        newlines = 0;
-                    }
-                    lineHasContent = false;
-                    lineHasWhitespace = false;
-                    if (remainder <= 0) {
-                        --offset; // Revert character offset
-                        break;
-                    }
-                }
-
-                lineHasContent = (charAttributes === 2); // 3 = character is a newline
-
-                if (lineHasWhitespace) {
-                    if (lineHasContent) {
-                        content += ' ';
-                        lineHasWhitespace = false;
-                        if (--remainder <= 0) {
-                            --offset; // Revert character offset
-                            break;
-                        }
-                    } else {
-                        lineHasWhitespace = false;
-                    }
-                }
-
-                content += char;
-
-                if (--remainder <= 0) { break; }
-            }
-        }
-
-        this._lineHasWhitespace = lineHasWhitespace;
-        this._lineHasContent = lineHasContent;
-        this._content = content;
-        this._offset = offset;
-        this._remainder = remainder;
-        this._newlines = newlines;
-
-        return (remainder > 0);
-    }
-
-    /**
-     * Seeks backward in a text node.
-     * This function is nearly the same as _seekTextNodeForward, with the following differences:
-     * - Iteration condition is reversed to check if offset is greater than 0.
-     * - offset is reset to nodeValueLength instead of 0.
-     * - offset is decremented instead of incremented.
-     * - 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.
-     */
-    _seekTextNodeBackward(textNode, resetOffset) {
-        const nodeValue = textNode.nodeValue;
-        const nodeValueLength = nodeValue.length;
-        const [preserveNewlines, preserveWhitespace] = (
-            this._forcePreserveWhitespace ?
-            [true, true] :
-            DOMTextScanner.getWhitespaceSettings(textNode)
-        );
-
-        let lineHasWhitespace = this._lineHasWhitespace;
-        let lineHasContent = this._lineHasContent;
-        let content = this._content;
-        let offset = resetOffset ? nodeValueLength : this._offset;
-        let remainder = this._remainder;
-        let newlines = this._newlines;
-
-        while (offset > 0) {
-            --offset;
-            const char = nodeValue[offset];
-            const charAttributes = DOMTextScanner.getCharacterAttributes(char, preserveNewlines, preserveWhitespace);
-
-            if (charAttributes === 0) {
-                // Character should be ignored
-                continue;
-            } else if (charAttributes === 1) {
-                // Character is collapsable whitespace
-                lineHasWhitespace = true;
-            } else {
-                // Character should be added to the content
-                if (newlines > 0) {
-                    if (content.length > 0) {
-                        const useNewlineCount = Math.min(remainder, newlines);
-                        content = '\n'.repeat(useNewlineCount) + content;
-                        remainder -= useNewlineCount;
-                        newlines -= useNewlineCount;
-                    } else {
-                        newlines = 0;
-                    }
-                    lineHasContent = false;
-                    lineHasWhitespace = false;
-                    if (remainder <= 0) {
-                        ++offset; // Revert character offset
-                        break;
-                    }
-                }
-
-                lineHasContent = (charAttributes === 2); // 3 = character is a newline
-
-                if (lineHasWhitespace) {
-                    if (lineHasContent) {
-                        content = ' ' + content;
-                        lineHasWhitespace = false;
-                        if (--remainder <= 0) {
-                            ++offset; // Revert character offset
-                            break;
-                        }
-                    } else {
-                        lineHasWhitespace = false;
-                    }
-                }
-
-                content = char + content;
-
-                if (--remainder <= 0) { break; }
-            }
-        }
-
-        this._lineHasWhitespace = lineHasWhitespace;
-        this._lineHasContent = lineHasContent;
-        this._content = content;
-        this._offset = offset;
-        this._remainder = remainder;
-        this._newlines = newlines;
-
-        return (remainder > 0);
-    }
-
-    // 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.
-     */
-    static getNextNode(node, forward, visitChildren, exitedNodes) {
-        let next = visitChildren ? (forward ? node.firstChild : node.lastChild) : null;
-        if (next === null) {
-            while (true) {
-                exitedNodes.push(node);
-
-                next = (forward ? node.nextSibling : node.previousSibling);
-                if (next !== null) { break; }
-
-                next = node.parentNode;
-                if (next === null) { break; }
-
-                node = next;
-            }
-        }
-        return next;
-    }
-
-    /**
-     * Gets the parent element of a given Node.
-     * @param node The node to check.
-     * @returns The parent element if one exists, otherwise null.
-     */
-    static getParentElement(node) {
-        while (node !== null && node.nodeType !== Node.ELEMENT_NODE) {
-            node = node.parentNode;
-        }
-        return node;
-    }
-
-    /**
-     * 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.
-     */
-    static getParentRubyElement(node) {
-        node = DOMTextScanner.getParentElement(node);
-        if (node !== null && node.nodeName.toUpperCase() === 'RT') {
-            node = node.parentNode;
-            if (node !== null && node.nodeName.toUpperCase() === 'RUBY') {
-                return node;
-            }
-        }
-        return null;
-    }
-
-    /**
-     * @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.
-     *     1 newline corresponds to a simple new line in the layout.
-     *     2 newlines corresponds to a significant visual distinction since the previous content.
-     */
-    static getElementSeekInfo(element) {
-        let enterable = true;
-        switch (element.nodeName.toUpperCase()) {
-            case 'HEAD':
-            case 'RT':
-            case 'SCRIPT':
-            case 'STYLE':
-                return [false, 0];
-            case 'BR':
-                return [false, 1];
-            case 'TEXTAREA':
-            case 'INPUT':
-            case 'BUTTON':
-                enterable = false;
-                break;
-        }
-
-        const style = window.getComputedStyle(element);
-        const display = style.display;
-
-        const visible = (display !== 'none' && DOMTextScanner.isStyleVisible(style));
-        let newlines = 0;
-
-        if (!visible) {
-            enterable = false;
-        } else {
-            switch (style.position) {
-                case 'absolute':
-                case 'fixed':
-                case 'sticky':
-                    newlines = 2;
-                    break;
-            }
-            if (newlines === 0 && DOMTextScanner.doesCSSDisplayChangeLayout(display)) {
-                newlines = 1;
-            }
-        }
-
-        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];
-    }
-
-    /**
-     * Gets attributes for the specified character.
-     * @param character A string containing a single character.
-     * @returns An integer representing the attributes of the character.
-     *   0: Character should be ignored.
-     *   1: Character is collapsable whitespace.
-     *   2: Character should be added to the content.
-     *   3: Character should be added to the content and is a newline.
-     */
-    static getCharacterAttributes(character, preserveNewlines, preserveWhitespace) {
-        switch (character.charCodeAt(0)) {
-            case 0x09: // Tab ('\t')
-            case 0x0c: // Form feed ('\f')
-            case 0x0d: // Carriage return ('\r')
-            case 0x20: // Space (' ')
-                return preserveWhitespace ? 2 : 1;
-            case 0x0a: // Line feed ('\n')
-                return preserveNewlines ? 3 : 1;
-            case 0x200c: // Zero-width non-joiner ('\u200c')
-                return 0;
-            default: // Other
-                return 2;
-        }
-    }
-
-    /**
-     * 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.
-     */
-    static isStyleVisible(style) {
-        return !(
-            style.visibility === 'hidden' ||
-            parseFloat(style.opacity) <= 0 ||
-            parseFloat(style.fontSize) <= 0 ||
-            (
-                !DOMTextScanner.isStyleSelectable(style) &&
-                (
-                    DOMTextScanner.isCSSColorTransparent(style.color) ||
-                    DOMTextScanner.isCSSColorTransparent(style.webkitTextFillColor)
-                )
-            )
-        );
-    }
-
-    /**
-     * 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.
-     */
-    static isStyleSelectable(style) {
-        return !(
-            style.userSelect === 'none' ||
-            style.webkitUserSelect === 'none' ||
-            style.MozUserSelect === 'none' ||
-            style.msUserSelect === 'none'
-        );
-    }
-
-    /**
-     * 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.
-     */
-    static isCSSColorTransparent(cssColor) {
-        return (
-            typeof cssColor === 'string' &&
-            cssColor.startsWith('rgba(') &&
-            /,\s*0.?0*\)$/.test(cssColor)
-        );
-    }
-
-    /**
-     * 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.
-     */
-    static doesCSSDisplayChangeLayout(cssDisplay) {
-        let pos = cssDisplay.indexOf(' ');
-        if (pos >= 0) {
-            // Truncate to <display-outside> part
-            cssDisplay = cssDisplay.substring(0, pos);
-        }
-
-        pos = cssDisplay.indexOf('-');
-        if (pos >= 0) {
-            // Truncate to first part of kebab-case value
-            cssDisplay = cssDisplay.substring(0, pos);
-        }
-
-        switch (cssDisplay) {
-            case 'block':
-            case 'flex':
-            case 'grid':
-            case 'list': // list-item
-            case 'table': // table, table-*
-                return true;
-            case 'ruby': // rubt-*
-                return (pos >= 0);
-            default:
-                return false;
-        }
-    }
-}