Refactor seekForward and seekBackward
This commit is contained in:
toasted-nutbread
parent
a5f393fa2c
commit
03c52625a9
@ -83,10 +83,6 @@ class TextSourceRange {
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}
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static shouldEnter(node) {
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if (node.nodeType !== 1) {
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return false;
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}
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switch (node.nodeName.toUpperCase()) {
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case 'RT':
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case 'SCRIPT':
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@ -101,102 +97,128 @@ class TextSourceRange {
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parseFloat(style.fontSize) === 0);
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}
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static getRubyElement(node) {
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node = TextSourceRange.getParentElement(node);
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if (node !== null && node.nodeName.toUpperCase() === "RT") {
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node = node.parentNode;
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return (node !== null && node.nodeName.toUpperCase() === "RUBY") ? node : null;
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}
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return null;
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}
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static seekForward(node, offset, length) {
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const state = {node, offset, remainder: length, content: ''};
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if (!TextSourceRange.seekForwardHelper(node, state)) {
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return state;
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const TEXT_NODE = Node.TEXT_NODE;
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const ELEMENT_NODE = Node.ELEMENT_NODE;
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let resetOffset = false;
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const ruby = TextSourceRange.getRubyElement(node);
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if (ruby !== null) {
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node = ruby;
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resetOffset = true;
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}
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for (let current = node; current !== null; current = current.parentElement) {
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for (let sibling = current.nextSibling; sibling !== null; sibling = sibling.nextSibling) {
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if (!TextSourceRange.seekForwardHelper(sibling, state)) {
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return state;
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while (node !== null) {
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let visitChildren = true;
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const nodeType = node.nodeType;
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if (nodeType === TEXT_NODE) {
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state.node = node;
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if (TextSourceRange.seekForwardTextNode(state, resetOffset)) {
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break;
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}
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resetOffset = true;
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} else if (nodeType === ELEMENT_NODE) {
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visitChildren = TextSourceRange.shouldEnter(node);
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}
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node = TextSourceRange.getNextNode(node, visitChildren);
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}
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return state;
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}
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static seekForwardHelper(node, state) {
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if (node.nodeType === 3 && node.parentElement && TextSourceRange.shouldEnter(node.parentElement)) {
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const offset = state.node === node ? state.offset : 0;
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static seekForwardTextNode(state, resetOffset) {
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const nodeValue = state.node.nodeValue;
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const nodeValueLength = nodeValue.length;
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let content = state.content;
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let offset = resetOffset ? 0 : state.offset;
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let remainder = state.remainder;
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let result = false;
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let consumed = 0;
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let stripped = 0;
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while (state.remainder - consumed > 0) {
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const currentChar = node.nodeValue[offset + consumed + stripped];
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if (!currentChar) {
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break;
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} else if (currentChar.match(IGNORE_TEXT_PATTERN)) {
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stripped++;
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} else {
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consumed++;
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state.content += currentChar;
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}
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}
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state.node = node;
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state.offset = offset + consumed + stripped;
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state.remainder -= consumed;
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} else if (TextSourceRange.shouldEnter(node)) {
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for (let i = 0; i < node.childNodes.length; ++i) {
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if (!TextSourceRange.seekForwardHelper(node.childNodes[i], state)) {
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for (; offset < nodeValueLength; ++offset) {
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const c = nodeValue[offset];
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if (!IGNORE_TEXT_PATTERN.test(c)) {
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content += c;
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if (--remainder <= 0) {
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result = true;
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++offset;
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break;
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}
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}
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}
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return state.remainder > 0;
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state.offset = offset;
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state.content = content;
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state.remainder = remainder;
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return result;
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}
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static seekBackward(node, offset, length) {
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const state = {node, offset, remainder: length, content: ''};
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if (!TextSourceRange.seekBackwardHelper(node, state)) {
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return state;
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const TEXT_NODE = Node.TEXT_NODE;
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const ELEMENT_NODE = Node.ELEMENT_NODE;
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let resetOffset = false;
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const ruby = TextSourceRange.getRubyElement(node);
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if (ruby !== null) {
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node = ruby;
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resetOffset = true;
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}
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for (let current = node; current !== null; current = current.parentElement) {
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for (let sibling = current.previousSibling; sibling !== null; sibling = sibling.previousSibling) {
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if (!TextSourceRange.seekBackwardHelper(sibling, state)) {
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return state;
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while (node !== null) {
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let visitChildren = true;
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const nodeType = node.nodeType;
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if (nodeType === TEXT_NODE) {
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state.node = node;
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if (TextSourceRange.seekBackwardTextNode(state, resetOffset)) {
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break;
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}
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resetOffset = true;
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} else if (nodeType === ELEMENT_NODE) {
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visitChildren = TextSourceRange.shouldEnter(node);
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}
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node = TextSourceRange.getPreviousNode(node, visitChildren);
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}
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return state;
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}
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static seekBackwardHelper(node, state) {
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if (node.nodeType === 3 && node.parentElement && TextSourceRange.shouldEnter(node.parentElement)) {
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const offset = state.node === node ? state.offset : node.length;
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static seekBackwardTextNode(state, resetOffset) {
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const nodeValue = state.node.nodeValue;
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let content = state.content;
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let offset = resetOffset ? nodeValue.length : state.offset;
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let remainder = state.remainder;
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let result = false;
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let consumed = 0;
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let stripped = 0;
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while (state.remainder - consumed > 0) {
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const currentChar = node.nodeValue[offset - 1 - consumed - stripped]; // negative indices are undefined in JS
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if (!currentChar) {
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break;
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} else if (currentChar.match(IGNORE_TEXT_PATTERN)) {
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stripped++;
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} else {
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consumed++;
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state.content = currentChar + state.content;
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}
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}
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state.node = node;
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state.offset = offset - consumed - stripped;
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state.remainder -= consumed;
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} else if (TextSourceRange.shouldEnter(node)) {
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for (let i = node.childNodes.length - 1; i >= 0; --i) {
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if (!TextSourceRange.seekBackwardHelper(node.childNodes[i], state)) {
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for (; offset > 0; --offset) {
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const c = nodeValue[offset - 1];
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if (!IGNORE_TEXT_PATTERN.test(c)) {
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content = c + content;
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if (--remainder <= 0) {
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result = true;
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--offset;
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break;
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}
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}
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}
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return state.remainder > 0;
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state.offset = offset;
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state.content = content;
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state.remainder = remainder;
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return result;
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}
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static getParentElement(node) {
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@ -219,15 +241,15 @@ class TextSourceRange {
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static getNodesInRange(range) {
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const end = range.endContainer;
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const nodes = [];
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for (let node = range.startContainer; node !== null; node = TextSourceRange.getNextNode(node)) {
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for (let node = range.startContainer; node !== null; node = TextSourceRange.getNextNode(node, true)) {
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nodes.push(node);
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if (node === end) { break; }
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}
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return nodes;
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}
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static getNextNode(node) {
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let next = node.firstChild;
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static getNextNode(node, visitChildren) {
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let next = visitChildren ? node.firstChild : null;
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if (next === null) {
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while (true) {
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next = node.nextSibling;
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@ -242,6 +264,22 @@ class TextSourceRange {
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return next;
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}
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static getPreviousNode(node, visitChildren) {
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let next = visitChildren ? node.lastChild : null;
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if (next === null) {
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while (true) {
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next = node.previousSibling;
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if (next !== null) { break; }
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next = node.parentNode;
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if (next === null) { break; }
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node = next;
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}
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}
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return next;
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}
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static anyNodeMatchesSelector(nodeList, selector) {
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for (const node of nodeList) {
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if (TextSourceRange.nodeMatchesSelector(node, selector)) {
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