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binding-builder.ts
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156 lines (139 loc) · 4.91 KB
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var expressionSymbolsRegex = /[ \+\-\*%\?:<>=!\|&\(\)\[\]^~]/;
export module bindingConstants {
export var sourceProperty = "sourceProperty";
export var targetProperty = "targetProperty";
export var expression = "expression";
export var twoWay = "twoWay";
export var source = "source";
export var bindingValueKey = "$value";
};
var hasEqualSignRegex = /=+/;
var equalSignComparisionOperatorsRegex = /(==|===|>=|<=|!=|!==)/;
function isNamedParam(value) {
var equalSignIndex = value.search(hasEqualSignRegex);
if (equalSignIndex > -1) {
var equalSignSurround = value.substr(equalSignIndex > 0 ? equalSignIndex - 1 : 0, 3);
if (equalSignSurround.search(equalSignComparisionOperatorsRegex) === -1) {
return true;
}
}
return false;
}
function areNamedParams(params: Array<any>) {
var i;
for (i = 0; i < params.length; i++) {
if (isNamedParam(params[i])) {
return true;
}
}
return false;
}
var namedParamConstants = {
propName: "propName",
propValue: "propValue"
}
function getPropertyNameValuePair(param, knownOptions, callback) {
var nameValuePair = {};
var propertyName = param.substr(0, param.indexOf("=")).trim();
var propertyValue = param.substr(param.indexOf("=") + 1).trim();
if (knownOptions) {
if (!propertyName) {
propertyName = knownOptions.defaultProperty;
}
else {
propertyName = propertyName in knownOptions ? propertyName : null;
}
}
if (propertyName) {
if (callback) {
nameValuePair = callback(propertyName, propertyValue);
}
else {
nameValuePair[namedParamConstants.propName] = propertyName;
nameValuePair[namedParamConstants.propValue] = propertyValue;
}
return nameValuePair;
}
return null;
}
function parseNamedProperties(parameterList, knownOptions, callback) {
var result = {};
var i;
for (i = 0; i < parameterList.length; i++) {
var nameValuePair = getPropertyNameValuePair(parameterList[i], knownOptions, callback);
if (nameValuePair) {
result[nameValuePair[namedParamConstants.propName]] = nameValuePair[namedParamConstants.propValue];
}
}
return result;
}
function extractPropertyNameFromExpression(expression: string): string {
var firstExpressionSymbolIndex = expression.search(expressionSymbolsRegex);
if (firstExpressionSymbolIndex > -1) {
var sourceProp = expression.substr(0, firstExpressionSymbolIndex).trim();
return sourceProp;
}
else {
return expression;
}
}
export function getBindingOptions(name: string, value: string): any {
var namedParams = [];
var params = value.split(",");
if (!areNamedParams(params)) {
if (params.length === 1) {
namedParams.push(bindingConstants.sourceProperty + " = " + extractPropertyNameFromExpression(params[0].trim()));
var expression = params[0].search(expressionSymbolsRegex) > -1 ? params[0].trim() : null;
if (expression) {
namedParams.push(bindingConstants.expression + " = " + expression);
}
namedParams.push(bindingConstants.twoWay + " = true");
}
else {
namedParams.push(bindingConstants.sourceProperty + " = " + extractPropertyNameFromExpression(params[0].trim()));
namedParams.push(bindingConstants.expression + " = " + params[1].trim());
var twoWay = params[2] ? params[2].toLowerCase().trim() === "true" : true;
namedParams.push(bindingConstants.twoWay + " = " + twoWay);
}
}
else {
namedParams = params;
}
var bindingPropertyHandler = function (prop, value) {
var result = {};
result[namedParamConstants.propName] = prop;
if (prop === bindingConstants.twoWay) {
// create a real boolean value
if (value === "true") {
result[namedParamConstants.propValue] = true;
}
else {
result[namedParamConstants.propValue] = false;
}
}
else {
result[namedParamConstants.propValue] = value;
}
return result;
};
var bindingOptionsParameters = parseNamedProperties(namedParams, xmlBindingProperties, bindingPropertyHandler);
var bindOptions = {
targetProperty: name
};
for (var prop in bindingOptionsParameters) {
if (bindingOptionsParameters.hasOwnProperty(prop)) {
bindOptions[prop] = bindingOptionsParameters[prop];
}
}
if (bindOptions[bindingConstants.twoWay] === undefined) {
bindOptions[bindingConstants.twoWay] = true;
}
return bindOptions;
}
var xmlBindingProperties = {
sourceProperty: true,
expression: true,
twoWay: true,
source: true,
defaultProperty: bindingConstants.sourceProperty
};