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node-red/editor/js/text/bidi.js
2017-01-11 15:24:33 +00:00

131 lines
3.8 KiB
JavaScript

/**
* Copyright JS Foundation and other contributors, http://js.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.
**/
RED.text = {};
RED.text.bidi = (function() {
var textDir = "";
var LRE = "\u202A",
RLE = "\u202B",
PDF = "\u202C";
function isRTLValue(stringValue) {
var length = stringValue.length;
for (var i=0;i<length;i++) {
if (isBidiChar(stringValue.charCodeAt(i))) {
return true;
}
else if(isLatinChar(stringValue.charCodeAt(i))) {
return false;
}
}
return false;
}
function isBidiChar(c) {
return (c >= 0x05d0 && c <= 0x05ff)||
(c >= 0x0600 && c <= 0x065f)||
(c >= 0x066a && c <= 0x06ef)||
(c >= 0x06fa && c <= 0x07ff)||
(c >= 0xfb1d && c <= 0xfdff)||
(c >= 0xfe70 && c <= 0xfefc);
}
function isLatinChar(c){
return (c > 64 && c < 91)||(c > 96 && c < 123)
}
/**
* Determines the text direction of a given string.
* @param value - the string
*/
function resolveBaseTextDir(value) {
if (textDir == "auto") {
if (isRTLValue(value)) {
return "rtl";
} else {
return "ltr";
}
}
else {
return textDir;
}
}
function onInputChange() {
$(this).attr("dir", resolveBaseTextDir($(this).val()));
}
/**
* Adds event listeners to the Input to ensure its text-direction attribute
* is properly set based on its content.
* @param input - the input field
*/
function prepareInput(input) {
input.on("keyup",onInputChange).on("paste",onInputChange).on("cut",onInputChange);
// Set the initial text direction
onInputChange.call(input);
}
/**
* Enforces the text direction of a given string by adding
* UCC (Unicode Control Characters)
* @param value - the string
*/
function enforceTextDirectionWithUCC(value) {
if (value) {
var dir = resolveBaseTextDir(value);
if (dir == "ltr") {
return LRE + value + PDF;
}
else if (dir == "rtl") {
return RLE + value + PDF;
}
}
return value;
}
/**
* Enforces the text direction for all the spans with style bidiAware under
* workspace or sidebar div
*/
function enforceTextDirectionOnPage() {
$("#workspace").find('span.bidiAware').each(function() {
$(this).attr("dir", resolveBaseTextDir($(this).html()));
});
$("#sidebar").find('span.bidiAware').each(function() {
$(this).attr("dir", resolveBaseTextDir($(this).text()));
});
}
/**
* Sets the text direction preference
* @param dir - the text direction preference
*/
function setTextDirection(dir) {
textDir = dir;
RED.nodes.eachNode(function(n) { n.dirty = true;});
RED.view.redraw();
RED.palette.refresh();
enforceTextDirectionOnPage();
}
return {
setTextDirection: setTextDirection,
enforceTextDirectionWithUCC: enforceTextDirectionWithUCC,
resolveBaseTextDir: resolveBaseTextDir,
prepareInput: prepareInput
}
})();