80 lines
2.0 KiB
JavaScript
80 lines
2.0 KiB
JavaScript
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/* Copyright 2021 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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class XfaText {
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/**
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* Walk an XFA tree and create an array of text nodes that is compatible
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* with a regular PDFs TextContent. Currently, only TextItem.str is supported,
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* all other fields and styles haven't been implemented.
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*
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* @param {Object} xfa - An XFA fake DOM object.
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*
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* @returns {TextContent}
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*/
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static textContent(xfa) {
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const items = [];
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const output = {
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items,
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styles: Object.create(null),
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};
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function walk(node) {
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if (!node) {
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return;
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}
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let str = null;
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const name = node.name;
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if (name === "#text") {
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str = node.value;
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} else if (!XfaText.shouldBuildText(name)) {
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return;
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} else if (node?.attributes?.textContent) {
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str = node.attributes.textContent;
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} else if (node.value) {
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str = node.value;
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}
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if (str !== null) {
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items.push({
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str,
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});
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}
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if (!node.children) {
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return;
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}
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for (const child of node.children) {
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walk(child);
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}
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}
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walk(xfa);
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return output;
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}
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/**
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* @param {string} name - DOM node name. (lower case)
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*
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* @returns {boolean} true if the DOM node should have a corresponding text
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* node.
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*/
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static shouldBuildText(name) {
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return !(
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name === "textarea" ||
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name === "input" ||
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name === "option" ||
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name === "select"
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);
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}
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}
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export { XfaText };
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