pdfjs-dist
Version:
Generic build of Mozilla's PDF.js library.
288 lines (287 loc) • 8.26 kB
JavaScript
/**
* @licstart The following is the entire license notice for the
* JavaScript code in this page
*
* Copyright 2022 Mozilla Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* @licend The above is the entire license notice for the
* JavaScript code in this page
*/
;
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.createDataNode = createDataNode;
exports.searchNode = searchNode;
var _xfa_object = require("./xfa_object.js");
var _namespaces = require("./namespaces.js");
var _util = require("../../shared/util.js");
const namePattern = /^[^.[]+/;
const indexPattern = /^[^\]]+/;
const operators = {
dot: 0,
dotDot: 1,
dotHash: 2,
dotBracket: 3,
dotParen: 4
};
const shortcuts = new Map([["$data", (root, current) => root.datasets ? root.datasets.data : root], ["$record", (root, current) => (root.datasets ? root.datasets.data : root)[_xfa_object.$getChildren]()[0]], ["$template", (root, current) => root.template], ["$connectionSet", (root, current) => root.connectionSet], ["$form", (root, current) => root.form], ["$layout", (root, current) => root.layout], ["$host", (root, current) => root.host], ["$dataWindow", (root, current) => root.dataWindow], ["$event", (root, current) => root.event], ["!", (root, current) => root.datasets], ["$xfa", (root, current) => root], ["xfa", (root, current) => root], ["$", (root, current) => current]]);
const somCache = new WeakMap();
const NS_DATASETS = _namespaces.NamespaceIds.datasets.id;
function parseIndex(index) {
index = index.trim();
if (index === "*") {
return Infinity;
}
return parseInt(index, 10) || 0;
}
function parseExpression(expr, dotDotAllowed, noExpr = true) {
let match = expr.match(namePattern);
if (!match) {
return null;
}
let [name] = match;
const parsed = [{
name,
cacheName: "." + name,
index: 0,
js: null,
formCalc: null,
operator: operators.dot
}];
let pos = name.length;
while (pos < expr.length) {
const spos = pos;
const char = expr.charAt(pos++);
if (char === "[") {
match = expr.slice(pos).match(indexPattern);
if (!match) {
(0, _util.warn)("XFA - Invalid index in SOM expression");
return null;
}
parsed.at(-1).index = parseIndex(match[0]);
pos += match[0].length + 1;
continue;
}
let operator;
switch (expr.charAt(pos)) {
case ".":
if (!dotDotAllowed) {
return null;
}
pos++;
operator = operators.dotDot;
break;
case "#":
pos++;
operator = operators.dotHash;
break;
case "[":
if (noExpr) {
(0, _util.warn)("XFA - SOM expression contains a FormCalc subexpression which is not supported for now.");
return null;
}
operator = operators.dotBracket;
break;
case "(":
if (noExpr) {
(0, _util.warn)("XFA - SOM expression contains a JavaScript subexpression which is not supported for now.");
return null;
}
operator = operators.dotParen;
break;
default:
operator = operators.dot;
break;
}
match = expr.slice(pos).match(namePattern);
if (!match) {
break;
}
[name] = match;
pos += name.length;
parsed.push({
name,
cacheName: expr.slice(spos, pos),
operator,
index: 0,
js: null,
formCalc: null
});
}
return parsed;
}
function searchNode(root, container, expr, dotDotAllowed = true, useCache = true) {
const parsed = parseExpression(expr, dotDotAllowed);
if (!parsed) {
return null;
}
const fn = shortcuts.get(parsed[0].name);
let i = 0;
let isQualified;
if (fn) {
isQualified = true;
root = [fn(root, container)];
i = 1;
} else {
isQualified = container === null;
root = [container || root];
}
for (let ii = parsed.length; i < ii; i++) {
const {
name,
cacheName,
operator,
index
} = parsed[i];
const nodes = [];
for (const node of root) {
if (!(node instanceof _xfa_object.XFAObject)) {
continue;
}
let children, cached;
if (useCache) {
cached = somCache.get(node);
if (!cached) {
cached = new Map();
somCache.set(node, cached);
}
children = cached.get(cacheName);
}
if (!children) {
switch (operator) {
case operators.dot:
children = node[_xfa_object.$getChildrenByName](name, false);
break;
case operators.dotDot:
children = node[_xfa_object.$getChildrenByName](name, true);
break;
case operators.dotHash:
children = node[_xfa_object.$getChildrenByClass](name);
if (children instanceof _xfa_object.XFAObjectArray) {
children = children.children;
} else {
children = [children];
}
break;
default:
break;
}
if (useCache) {
cached.set(cacheName, children);
}
}
if (children.length > 0) {
nodes.push(children);
}
}
if (nodes.length === 0 && !isQualified && i === 0) {
const parent = container[_xfa_object.$getParent]();
container = parent;
if (!container) {
return null;
}
i = -1;
root = [container];
continue;
}
if (isFinite(index)) {
root = nodes.filter(node => index < node.length).map(node => node[index]);
} else {
root = nodes.flat();
}
}
if (root.length === 0) {
return null;
}
return root;
}
function createNodes(root, path) {
let node = null;
for (const {
name,
index
} of path) {
for (let i = 0, ii = !isFinite(index) ? 0 : index; i <= ii; i++) {
const nsId = root[_xfa_object.$namespaceId] === NS_DATASETS ? -1 : root[_xfa_object.$namespaceId];
node = new _xfa_object.XmlObject(nsId, name);
root[_xfa_object.$appendChild](node);
}
root = node;
}
return node;
}
function createDataNode(root, container, expr) {
const parsed = parseExpression(expr);
if (!parsed) {
return null;
}
if (parsed.some(x => x.operator === operators.dotDot)) {
return null;
}
const fn = shortcuts.get(parsed[0].name);
let i = 0;
if (fn) {
root = fn(root, container);
i = 1;
} else {
root = container || root;
}
for (let ii = parsed.length; i < ii; i++) {
const {
name,
operator,
index
} = parsed[i];
if (!isFinite(index)) {
parsed[i].index = 0;
return createNodes(root, parsed.slice(i));
}
let children;
switch (operator) {
case operators.dot:
children = root[_xfa_object.$getChildrenByName](name, false);
break;
case operators.dotDot:
children = root[_xfa_object.$getChildrenByName](name, true);
break;
case operators.dotHash:
children = root[_xfa_object.$getChildrenByClass](name);
if (children instanceof _xfa_object.XFAObjectArray) {
children = children.children;
} else {
children = [children];
}
break;
default:
break;
}
if (children.length === 0) {
return createNodes(root, parsed.slice(i));
}
if (index < children.length) {
const child = children[index];
if (!(child instanceof _xfa_object.XFAObject)) {
(0, _util.warn)(`XFA - Cannot create a node.`);
return null;
}
root = child;
} else {
parsed[i].index = index - children.length;
return createNodes(root, parsed.slice(i));
}
}
return null;
}