speech-rule-engine
Version:
A standalone speech rule engine for XML structures, based on the original engine from ChromeVox.
78 lines (77 loc) • 2.37 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.xpath = void 0;
exports.resolveNameSpace = resolveNameSpace;
exports.evalXPath = evalXPath;
exports.evaluateBoolean = evaluateBoolean;
exports.evaluateString = evaluateString;
exports.updateEvaluator = updateEvaluator;
const engine_js_1 = require("./engine.js");
const EngineConst = require("../common/engine_const.js");
const system_external_js_1 = require("./system_external.js");
exports.xpath = system_external_js_1.SystemExternal.xpath;
const nameSpaces = {
xhtml: 'http://www.w3.org/1999/xhtml',
mathml: 'http://www.w3.org/1998/Math/MathML',
mml: 'http://www.w3.org/1998/Math/MathML',
svg: 'http://www.w3.org/2000/svg'
};
function resolveNameSpace(prefix) {
return nameSpaces[prefix] || null;
}
class Resolver {
constructor() {
this.lookupNamespaceURI = resolveNameSpace;
}
}
function evaluateXpath(expression, rootNode, type) {
return exports.xpath.evaluate(expression, rootNode, new Resolver(), type, null);
}
function evalXPath(expression, rootNode) {
let iterator;
try {
iterator = evaluateXpath(expression, rootNode, exports.xpath.result.ORDERED_NODE_ITERATOR_TYPE);
}
catch (_err) {
return [];
}
const results = [];
for (let xpathNode = iterator.iterateNext(); xpathNode; xpathNode = iterator.iterateNext()) {
results.push(xpathNode);
}
return results;
}
function evaluateBoolean(expression, rootNode) {
let result;
try {
result = evaluateXpath(expression, rootNode, exports.xpath.result.BOOLEAN_TYPE);
}
catch (_err) {
return false;
}
return result.booleanValue;
}
function evaluateString(expression, rootNode) {
let result;
try {
result = evaluateXpath(expression, rootNode, exports.xpath.result.STRING_TYPE);
}
catch (_err) {
return '';
}
return result.stringValue;
}
function updateEvaluator(node) {
if (engine_js_1.Engine.getInstance().mode !== EngineConst.Mode.HTTP)
return;
let parent = node;
while (parent && !parent.evaluate) {
parent = parent.parentNode;
}
if (parent && parent.evaluate) {
exports.xpath.currentDocument = parent;
}
else if (node.ownerDocument) {
exports.xpath.currentDocument = node.ownerDocument;
}
}