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Implemented the #{} key-value interpolate.

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This commit is contained in:
Ziang Song 2013-02-15 15:54:53 -05:00
commit 04423e1aaf
2 changed files with 120 additions and 47 deletions
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110
spec/KiwiSpec.js
View file

@ -1,53 +1,75 @@
describe('Kiwi.compose', function() {
it('should return the empty string when input is empty',function() {
var input = "";
expect(Kiwi.compose(input)).toEqual(input);
});
describe('Kiwi.compose - %', function() {
it('should return the empty string when input is empty',function() {
var input = "";
expect(Kiwi.compose(input)).toEqual(input);
});
it('should return the input string when array is null',function() {
var input = "text without interpolation";
expect(Kiwi.compose(input)).toEqual(input);
});
it('should return the input string when array is null',function() {
var input = "text without interpolation";
expect(Kiwi.compose(input)).toEqual(input);
});
it('should return replace %s with text', function() {
var input = "There are % apples";
var result = "There are five apples";
expect(Kiwi.compose(input, ["five"])).toEqual(result);
});
it('should return replace %s with text', function() {
var input = "There are % apples";
var result = "There are five apples";
expect(Kiwi.compose(input, ["five"])).toEqual(result);
});
it('should return replace % with text when % is last', function() {
var input = "There are five %";
var result = "There are five apples";
expect(Kiwi.compose(input, ["apples"])).toEqual(result);
});
it('should return replace % with text when % is last', function() {
var input = "There are five %";
var result = "There are five apples";
expect(Kiwi.compose(input, ["apples"])).toEqual(result);
});
it('should return replace % when input is %', function() {
var input = "%";
var result = "There are five apples";
expect(Kiwi.compose(input, [result])).toEqual(result);
});
it('should return replace % when input is %', function() {
var input = "%";
var result = "There are five apples";
expect(Kiwi.compose(input, [result])).toEqual(result);
});
it('should return replace 2 %s when input has 2 %s', function() {
var input = "There are % %";
var result = "There are five apples";
expect(Kiwi.compose(input, ["five", "apples"])).toEqual(result);
});
it('should return replace 2 %s when input has 2 %s', function() {
var input = "There are % %";
var result = "There are five apples";
expect(Kiwi.compose(input, ["five", "apples"])).toEqual(result);
});
it('should return replace 2 %s when input has 2 %s', function() {
var input = "% are % apples";
var result = "There are five apples";
expect(Kiwi.compose(input, ["There", "five"])).toEqual(result);
});
it('should return replace 2 %s when input has 2 %s', function() {
var input = "% are % apples";
var result = "There are five apples";
expect(Kiwi.compose(input, ["There", "five"])).toEqual(result);
});
it('should return escaped %', function() {
var input = "The % is 2.3`%";
var result = "The rate is 2.3%";
expect(Kiwi.compose(input, ["rate"])).toEqual(result);
});
it('should return escaped %', function() {
var input = "The % is 2.3`%";
var result = "The rate is 2.3%";
expect(Kiwi.compose(input, ["rate"])).toEqual(result);
});
it('should use an empty string when size of the array less fits the placeholders.', function() {
var input = "The quick brown % jumps % the lazy %.";
var result = "The quick brown fox jumps over the lazy .";
expect(Kiwi.compose(input, ["fox", "over"])).toEqual(result);
});
it('should use an empty string when size of the array less fits the placeholders.', function() {
var input = "The quick brown % jumps % the lazy %.";
var result = "The quick brown fox jumps over the lazy .";
expect(Kiwi.compose(input, ["fox", "over"])).toEqual(result);
});
});
describe('Kiwi.compose - %{}', function() {
it('should replace the variable defined in %{}',function() {
var input = "The quick brown %{f} jumps over the lazy %{d}.";
var dic = {"f": "fox", "d": "dog"};
var output = "The quick brown fox jumps over the lazy dog.";
expect(Kiwi.compose(input, dic)).toEqual(output);
});
it('should throw a syntax error.',function() {
var input = "The quick brown %{f jumps over the lazy dog.";
var dic = {"f": "fox", "d": "dog"};
expect(function(){Kiwi.compose(input, dic)}).toThrow(Error("Syntax error."));
});
it('should ignore when the variable is not available',function() {
var input = "The quick brown %{f} jumps over the lazy dog.";
var dic = {"d": "dog"};
var output = "The quick brown jumps over the lazy dog.";
expect(Kiwi.compose(input, dic)).toEqual(output);
});
});

57
src/Kiwi.js
View file

@ -1,9 +1,7 @@
var Kiwi = (function ($) {
var TRANSPOSE_CHAR = '%';
var interpolate = function(text, array){
if(array === undefined) return text;
var interpolate_general = function(text, array){
var stringToReturn = ""
,length = text.length
,index = 0
@ -31,6 +29,59 @@ var Kiwi = (function ($) {
}
}
return stringToReturn;
}
var get_key_length = function(text, index){
var length = text.length;
var key = "";
var i = index;
while(i < length && text[i] !== '}'){
key += text[i];
i++;
}
if(text[i] === '}') key += '}';
else throw Error("Syntax error.");
return [key.slice(2, key.length - 1), key.length];
}
var interpolate_key_value = function(text, json){
var stringToReturn = ""
,length = text.length
,index = 0;
for(var i = 0; i < length; i++){
var currentChar = text[i];
var nextChar = null;
if(i + 1 < length) nextChar = text[i+1];
if(currentChar === '%' && nextChar === '{'){
var result = get_key_length(text, i);
var key = result[0];
var key_length = result[1];
stringToReturn += (json[key] === undefined ? "" : json[key]);
i += key_length - 1 ;
}else{
stringToReturn += currentChar;
}
}
return stringToReturn;
}
var interpolate = function(text, input){
if(input === undefined) return text;
if(Object.prototype.toString.call(input) === "[object Array]"){
return interpolate_general(text, input);
}else{
return interpolate_key_value(text, input);
}
};
return {