# Code coverage report for spec/helpers.js

## Statements: 19.23% (70 / 364) Branches: 0% (0 / 26) Functions: 7.81% (10 / 128) Lines: 20.71% (70 / 338) Ignored: none

All files » spec/ » helpers.js

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     /*global CompilerContext, Handlebars, shouldCompileTo, shouldCompileToWithPartials, shouldThrow, handlebarsEnv */
    describe('helpers', function() {
      it("helper with complex lookup$", function() {
        var string = "{{#goodbyes}}{{{link ../prefix}}}{{/goodbyes}}";
        var hash = {prefix: "/root", goodbyes: [{text: "Goodbye", url: "goodbye"}]};
        var helpers = {link: function(prefix) {
          return "<a href='" + prefix + "/" + this.url + "'>" + this.text + "</a>";
        }};
        shouldCompileTo(string, [hash, helpers], "<a href='/root/goodbye'>Goodbye</a>");
      });

      it("helper for raw block gets raw content", function() {
        var string   = "{{{{raw}}}} {{test}} {{{{/raw}}}}";
        var hash = { test: "hello" };
        var helpers = { raw: function(options) {
            return options.fn();
        } };
        shouldCompileTo(string, [hash, helpers], " {{test}} ",
                        "raw block helper gets raw content");
      });

      it("helper for raw block gets parameters", function() {
        var string   = "{{{{raw 1 2 3}}}} {{test}} {{{{/raw}}}}";
        var hash = { test: "hello" };
        var helpers = { raw: function(a, b, c, options) {
            return options.fn() + a + b + c;
        } };
        shouldCompileTo(string, [hash, helpers], " {{test}} 123",
                        "raw block helper gets raw content");
      });

      it("helper block with complex lookup expression", function() {
        var string = "{{#goodbyes}}{{../name}}{{/goodbyes}}";
        var hash = {name: "Alan"};
        var helpers = {goodbyes: function(options) {
          var out = "";
          var byes = ["Goodbye", "goodbye", "GOODBYE"];
          for (var i = 0,j = byes.length; i < j; i++) {
            out += byes[i] + " " + options.fn(this) + "! ";
          }
          return out;
        }};
        shouldCompileTo(string, [hash, helpers], "Goodbye Alan! goodbye Alan! GOODBYE Alan! ");
      });

      it("helper with complex lookup and nested template", function() {
        var string = "{{#goodbyes}}{{#link ../prefix}}{{text}}{{/link}}{{/goodbyes}}";
        var hash = {prefix: '/root', goodbyes: [{text: "Goodbye", url: "goodbye"}]};
        var helpers = {link: function (prefix, options) {
            return "<a href='" + prefix + "/" + this.url + "'>" + options.fn(this) + "</a>";
        }};
        shouldCompileToWithPartials(string, [hash, helpers], false, "<a href='/root/goodbye'>Goodbye</a>");
      });

      it("helper with complex lookup and nested template in VM+Compiler", function() {
        var string = "{{#goodbyes}}{{#link ../prefix}}{{text}}{{/link}}{{/goodbyes}}";
        var hash = {prefix: '/root', goodbyes: [{text: "Goodbye", url: "goodbye"}]};
        var helpers = {link: function (prefix, options) {
            return "<a href='" + prefix + "/" + this.url + "'>" + options.fn(this) + "</a>";
        }};
        shouldCompileToWithPartials(string, [hash, helpers], true, "<a href='/root/goodbye'>Goodbye</a>");
      });

      it("block helper", function() {
        var string   = "{{#goodbyes}}{{text}}! {{/goodbyes}}cruel {{world}}!";
        var template = CompilerContext.compile(string);

        var result = template({world: "world"}, { helpers: {goodbyes: function(options) { return options.fn({text: "GOODBYE"}); }}});
        equal(result, "GOODBYE! cruel world!", "Block helper executed");
      });

      it("block helper staying in the same context", function() {
        var string   = "{{#form}}<p>{{name}}</p>{{/form}}";
        var template = CompilerContext.compile(string);

        var result = template({name: "Yehuda"}, {helpers: {form: function(options) { return "<form>" + options.fn(this) + "</form>"; } }});
        equal(result, "<form><p>Yehuda</p></form>", "Block helper executed with current context");
      });

      it("block helper should have context in this", function() {
        var source = "<ul>{{#people}}<li>{{#link}}{{name}}{{/link}}</li>{{/people}}</ul>";
        var link = function(options) {
          return '<a href="/people/' + this.id + '">' + options.fn(this) + '</a>';
        };
        var data = { "people": [
          { "name": "Alan", "id": 1 },
          { "name": "Yehuda", "id": 2 }
        ]};

        shouldCompileTo(source, [data, {link: link}], "<ul><li><a href=\"/people/1\">Alan</a></li><li><a href=\"/people/2\">Yehuda</a></li></ul>");
      });

      it("block helper for undefined value", function() {
        shouldCompileTo("{{#empty}}shouldn't render{{/empty}}", {}, "");
      });

      it("block helper passing a new context", function() {
        var string   = "{{#form yehuda}}<p>{{name}}</p>{{/form}}";
        var template = CompilerContext.compile(string);

        var result = template({yehuda: {name: "Yehuda"}}, { helpers: {form: function(context, options) { return "<form>" + options.fn(context) + "</form>"; }}});
        equal(result, "<form><p>Yehuda</p></form>", "Context variable resolved");
      });

      it("block helper passing a complex path context", function() {
        var string   = "{{#form yehuda/cat}}<p>{{name}}</p>{{/form}}";
        var template = CompilerContext.compile(string);

        var result = template({yehuda: {name: "Yehuda", cat: {name: "Harold"}}}, { helpers: {form: function(context, options) { return "<form>" + options.fn(context) + "</form>"; }}});
        equal(result, "<form><p>Harold</p></form>", "Complex path variable resolved");
      });

      it("nested block helpers", function() {
        var string   = "{{#form yehuda}}<p>{{name}}</p>{{#link}}Hello{{/link}}{{/form}}";
        var template = CompilerContext.compile(string);

        var result = template({
          yehuda: {name: "Yehuda" }
        }, {
          helpers: {
            link: function(options) { return "<a href='" + this.name + "'>" + options.fn(this) + "</a>"; },
            form: function(context, options) { return "<form>" + options.fn(context) + "</form>"; }
          }
        });
        equal(result, "<form><p>Yehuda</p><a href='Yehuda'>Hello</a></form>", "Both blocks executed");
      });

      it("block helper inverted sections", function() {
        var string = "{{#list people}}{{name}}{{^}}<em>Nobody's here</em>{{/list}}";
        var list = function(context, options) {
          if (context.length > 0) {
            var out = "<ul>";
            for(var i = 0,j=context.length; i < j; i++) {
              out += "<li>";
              out += options.fn(context[i]);
              out += "</li>";
            }
            out += "</ul>";
            return out;
          } else {
            return "<p>" + options.inverse(this) + "</p>";
          }
        };

        var hash = {people: [{name: "Alan"}, {name: "Yehuda"}]};
        var empty = {people: []};
        var rootMessage = {
          people: [],
          message: "Nobody's here"
        };

        var messageString = "{{#list people}}Hello{{^}}{{message}}{{/list}}";

        // the meaning here may be kind of hard to catch, but list.not is always called,
        // so we should see the output of both
        shouldCompileTo(string, [hash, { list: list }], "<ul><li>Alan</li><li>Yehuda</li></ul>", "an inverse wrapper is passed in as a new context");
        shouldCompileTo(string, [empty, { list: list }], "<p><em>Nobody's here</em></p>", "an inverse wrapper can be optionally called");
        shouldCompileTo(messageString, [rootMessage, { list: list }], "<p>Nobody&#x27;s here</p>", "the context of an inverse is the parent of the block");
      });

      it('pathed lambas with parameters', function() {
        var hash = {
          helper: function() {
            return 'winning';
          }
        };
        hash.hash = hash;
        var helpers = {
          './helper': function() {
            return 'fail';
          }
        };
        shouldCompileTo('{{./helper 1}}', [hash, helpers], 'winning');
        shouldCompileTo('{{hash/helper 1}}', [hash, helpers], 'winning');
      });

      describe("helpers hash", function() {
        it("providing a helpers hash", function() {
          shouldCompileTo("Goodbye {{cruel}} {{world}}!", [{cruel: "cruel"}, {world: function() { return "world"; }}], "Goodbye cruel world!",
                          "helpers hash is available");

          shouldCompileTo("Goodbye {{#iter}}{{cruel}} {{world}}{{/iter}}!", [{iter: [{cruel: "cruel"}]}, {world: function() { return "world"; }}],
                          "Goodbye cruel world!", "helpers hash is available inside other blocks");
        });

        it("in cases of conflict, helpers win", function() {
          shouldCompileTo("{{{lookup}}}", [{lookup: 'Explicit'}, {lookup: function() { return 'helpers'; }}], "helpers",
                          "helpers hash has precedence escaped expansion");
          shouldCompileTo("{{lookup}}", [{lookup: 'Explicit'}, {lookup: function() { return 'helpers'; }}], "helpers",
                          "helpers hash has precedence simple expansion");
        });

        it("the helpers hash is available is nested contexts", function() {
          shouldCompileTo("{{#outer}}{{#inner}}{{helper}}{{/inner}}{{/outer}}",
                        [{'outer': {'inner': {'unused':[]}}},  {'helper': function() { return 'helper'; }}], "helper",
                        "helpers hash is available in nested contexts.");
        });

        it("the helper hash should augment the global hash", function() {
          handlebarsEnv.registerHelper('test_helper', function() { return 'found it!'; });

          shouldCompileTo(
            "{{test_helper}} {{#if cruel}}Goodbye {{cruel}} {{world}}!{{/if}}", [
              {cruel: "cruel"},
              {world: function() { return "world!"; }}
            ],
            "found it! Goodbye cruel world!!");
        });
      });

      it("Multiple global helper registration", function() {
        var helpers = handlebarsEnv.helpers;
        handlebarsEnv.helpers = {};

        handlebarsEnv.registerHelper({
          'if': helpers['if'],
          world: function() { return "world!"; },
          test_helper: function() { return 'found it!'; }
        });

        shouldCompileTo(
          "{{test_helper}} {{#if cruel}}Goodbye {{cruel}} {{world}}!{{/if}}",
          [{cruel: "cruel"}],
          "found it! Goodbye cruel world!!");
      });

      it("decimal number literals work", function() {
        var string   = 'Message: {{hello -1.2 1.2}}';
        var hash     = {};
        var helpers  = {hello: function(times, times2) {
          if(typeof times !== 'number') { times = "NaN"; }
          if(typeof times2 !== 'number') { times2 = "NaN"; }
          return "Hello " + times + " " + times2 + " times";
        }};
        shouldCompileTo(string, [hash, helpers], "Message: Hello -1.2 1.2 times", "template with a negative integer literal");
      });

      it("negative number literals work", function() {
        var string   = 'Message: {{hello -12}}';
        var hash     = {};
        var helpers  = {hello: function(times) {
          if(typeof times !== 'number') { times = "NaN"; }
          return "Hello " + times + " times";
        }};
        shouldCompileTo(string, [hash, helpers], "Message: Hello -12 times", "template with a negative integer literal");
      });

      describe("String literal parameters", function() {
        it("simple literals work", function() {
          var string   = 'Message: {{hello "world" 12 true false}}';
          var hash     = {};
          var helpers  = {hello: function(param, times, bool1, bool2) {
            if(typeof times !== 'number') { times = "NaN"; }
            if(typeof bool1 !== 'boolean') { bool1 = "NaB"; }
            if(typeof bool2 !== 'boolean') { bool2 = "NaB"; }
            return "Hello " + param + " " + times + " times: " + bool1 + " " + bool2;
          }};
          shouldCompileTo(string, [hash, helpers], "Message: Hello world 12 times: true false", "template with a simple String literal");
        });

        it("using a quote in the middle of a parameter raises an error", function() {
          var string   = 'Message: {{hello wo"rld"}}';
          shouldThrow(function() {
            CompilerContext.compile(string);
          }, Error);
        });

        it("escaping a String is possible", function(){
          var string   = 'Message: {{{hello "\\"world\\""}}}';
          var hash     = {};
          var helpers = {hello: function(param) { return "Hello " + param; }};
          shouldCompileTo(string, [hash, helpers], "Message: Hello \"world\"", "template with an escaped String literal");
        });

        it("it works with ' marks", function() {
          var string   = 'Message: {{{hello "Alan\'s world"}}}';
          var hash     = {};
          var helpers = {hello: function(param) { return "Hello " + param; }};
          shouldCompileTo(string, [hash, helpers], "Message: Hello Alan's world", "template with a ' mark");
        });
      });

      it("negative number literals work", function() {
        var string   = 'Message: {{hello -12}}';
        var hash     = {};
        var helpers  = {hello: function(times) {
          if(typeof times !== 'number') { times = "NaN"; }
          return "Hello " + times + " times";
        }};
        shouldCompileTo(string, [hash, helpers], "Message: Hello -12 times", "template with a negative integer literal");
      });

      describe("multiple parameters", function() {
        it("simple multi-params work", function() {
          var string   = 'Message: {{goodbye cruel world}}';
          var hash     = {cruel: "cruel", world: "world"};
          var helpers = {goodbye: function(cruel, world) { return "Goodbye " + cruel + " " + world; }};
          shouldCompileTo(string, [hash, helpers], "Message: Goodbye cruel world", "regular helpers with multiple params");
        });

        it("block multi-params work", function() {
          var string   = 'Message: {{#goodbye cruel world}}{{greeting}} {{adj}} {{noun}}{{/goodbye}}';
          var hash     = {cruel: "cruel", world: "world"};
          var helpers = {goodbye: function(cruel, world, options) {
            return options.fn({greeting: "Goodbye", adj: cruel, noun: world});
          }};
          shouldCompileTo(string, [hash, helpers], "Message: Goodbye cruel world", "block helpers with multiple params");
        });
      });

      describe('hash', function() {
        it("helpers can take an optional hash", function() {
          var template = CompilerContext.compile('{{goodbye cruel="CRUEL" world="WORLD" times=12}}');

          var helpers = {
            goodbye: function(options) {
              return "GOODBYE " + options.hash.cruel + " " + options.hash.world + " " + options.hash.times + " TIMES";
            }
          };

          var context = {};

          var result = template(context, {helpers: helpers});
          equals(result, "GOODBYE CRUEL WORLD 12 TIMES", "Helper output hash");
        });

        it("helpers can take an optional hash with booleans", function() {
          var helpers = {
            goodbye: function(options) {
              if (options.hash.print === true) {
                return "GOODBYE " + options.hash.cruel + " " + options.hash.world;
              } else if (options.hash.print === false) {
                return "NOT PRINTING";
              } else {
                return "THIS SHOULD NOT HAPPEN";
              }
            }
          };

          var context = {};

          var template = CompilerContext.compile('{{goodbye cruel="CRUEL" world="WORLD" print=true}}');
          var result = template(context, {helpers: helpers});
          equals(result, "GOODBYE CRUEL WORLD", "Helper output hash");

          template = CompilerContext.compile('{{goodbye cruel="CRUEL" world="WORLD" print=false}}');
          result = template(context, {helpers: helpers});
          equals(result, "NOT PRINTING", "Boolean helper parameter honored");
        });

        it("block helpers can take an optional hash", function() {
          var template = CompilerContext.compile('{{#goodbye cruel="CRUEL" times=12}}world{{/goodbye}}');

          var helpers = {
            goodbye: function(options) {
              return "GOODBYE " + options.hash.cruel + " " + options.fn(this) + " " + options.hash.times + " TIMES";
            }
          };

          var result = template({}, {helpers: helpers});
          equals(result, "GOODBYE CRUEL world 12 TIMES", "Hash parameters output");
        });

        it("block helpers can take an optional hash with single quoted stings", function() {
          var template = CompilerContext.compile("{{#goodbye cruel='CRUEL' times=12}}world{{/goodbye}}");

          var helpers = {
            goodbye: function(options) {
              return "GOODBYE " + options.hash.cruel + " " + options.fn(this) + " " + options.hash.times + " TIMES";
            }
          };

          var result = template({}, {helpers: helpers});
          equals(result, "GOODBYE CRUEL world 12 TIMES", "Hash parameters output");
        });

        it("block helpers can take an optional hash with booleans", function() {
          var helpers = {
            goodbye: function(options) {
              if (options.hash.print === true) {
                return "GOODBYE " + options.hash.cruel + " " + options.fn(this);
              } else if (options.hash.print === false) {
                return "NOT PRINTING";
              } else {
                return "THIS SHOULD NOT HAPPEN";
              }
            }
          };

          var template = CompilerContext.compile('{{#goodbye cruel="CRUEL" print=true}}world{{/goodbye}}');
          var result = template({}, {helpers: helpers});
          equals(result, "GOODBYE CRUEL world", "Boolean hash parameter honored");

          template = CompilerContext.compile('{{#goodbye cruel="CRUEL" print=false}}world{{/goodbye}}');
          result = template({}, {helpers: helpers});
          equals(result, "NOT PRINTING", "Boolean hash parameter honored");
        });
      });

      describe("helperMissing", function() {
        it("if a context is not found, helperMissing is used", function() {
          shouldThrow(function() {
              var template = CompilerContext.compile("{{hello}} {{link_to world}}");
              template({});
          }, undefined, /Missing helper: 'link_to'/);
        });

        it("if a context is not found, custom helperMissing is used", function() {
          var string = "{{hello}} {{link_to world}}";
          var context = { hello: "Hello", world: "world" };

          var helpers = {
            helperMissing: function(mesg, options) {
              if(options.name === "link_to") {
                return new Handlebars.SafeString("<a>" + mesg + "</a>");
              }
            }
          };

          shouldCompileTo(string, [context, helpers], "Hello <a>world</a>");
        });
      });

      describe("knownHelpers", function() {
        it("Known helper should render helper", function() {
          var template = CompilerContext.compile("{{hello}}", {knownHelpers: {"hello" : true}});

          var result = template({}, {helpers: {hello: function() { return "foo"; }}});
          equal(result, "foo", "'foo' should === '" + result);
        });

        it("Unknown helper in knownHelpers only mode should be passed as undefined", function() {
          var template = CompilerContext.compile("{{typeof hello}}", {knownHelpers: {'typeof': true}, knownHelpersOnly: true});

          var result = template({}, {helpers: {'typeof': function(arg) { return typeof arg; }, hello: function() { return "foo"; }}});
          equal(result, "undefined", "'undefined' should === '" + result);
        });
        it("Builtin helpers available in knownHelpers only mode", function() {
          var template = CompilerContext.compile("{{#unless foo}}bar{{/unless}}", {knownHelpersOnly: true});

          var result = template({});
          equal(result, "bar", "'bar' should === '" + result);
        });
        it("Field lookup works in knownHelpers only mode", function() {
          var template = CompilerContext.compile("{{foo}}", {knownHelpersOnly: true});

          var result = template({foo: 'bar'});
          equal(result, "bar", "'bar' should === '" + result);
        });
        it("Conditional blocks work in knownHelpers only mode", function() {
          var template = CompilerContext.compile("{{#foo}}bar{{/foo}}", {knownHelpersOnly: true});

          var result = template({foo: 'baz'});
          equal(result, "bar", "'bar' should === '" + result);
        });
        it("Invert blocks work in knownHelpers only mode", function() {
          var template = CompilerContext.compile("{{^foo}}bar{{/foo}}", {knownHelpersOnly: true});

          var result = template({foo: false});
          equal(result, "bar", "'bar' should === '" + result);
        });
        it("Functions are bound to the context in knownHelpers only mode", function() {
          var template = CompilerContext.compile("{{foo}}", {knownHelpersOnly: true});
          var result = template({foo: function() { return this.bar; }, bar: 'bar'});
          equal(result, "bar", "'bar' should === '" + result);
        });
        it("Unknown helper call in knownHelpers only mode should throw", function() {
          shouldThrow(function() {
            CompilerContext.compile("{{typeof hello}}", {knownHelpersOnly: true});
          }, Error);
        });
      });

      describe("blockHelperMissing", function() {
        it("lambdas are resolved by blockHelperMissing, not handlebars proper", function() {
          var string = "{{#truthy}}yep{{/truthy}}";
          var data = { truthy: function() { return true; } };
          shouldCompileTo(string, data, "yep");
        });
        it("lambdas resolved by blockHelperMissing are bound to the context", function() {
          var string = "{{#truthy}}yep{{/truthy}}";
          var boundData = { truthy: function() { return this.truthiness(); }, truthiness: function() { return false; } };
          shouldCompileTo(string, boundData, "");
        });
      });

      describe('name field', function() {
        var context = {};
        var helpers = {
          blockHelperMissing: function() {
            return 'missing: ' + arguments[arguments.length-1].name;
          },
          helperMissing: function() {
            return 'helper missing: ' + arguments[arguments.length-1].name;
          },
          helper: function() {
            return 'ran: ' + arguments[arguments.length-1].name;
          }
        };

        it('should include in ambiguous mustache calls', function() {
          shouldCompileTo('{{helper}}', [context, helpers], 'ran: helper');
        });
        it('should include in helper mustache calls', function() {
          shouldCompileTo('{{helper 1}}', [context, helpers], 'ran: helper');
        });
        it('should include in ambiguous block calls', function() {
          shouldCompileTo('{{#helper}}{{/helper}}', [context, helpers], 'ran: helper');
        });
        it('should include in simple block calls', function() {
          shouldCompileTo('{{#./helper}}{{/./helper}}', [context, helpers], 'missing: ./helper');
        });
        it('should include in helper block calls', function() {
          shouldCompileTo('{{#helper 1}}{{/helper}}', [context, helpers], 'ran: helper');
        });
        it('should include in known helper calls', function() {
          var template = CompilerContext.compile("{{helper}}", {knownHelpers: {'helper': true}, knownHelpersOnly: true});

          equal(template({}, {helpers: helpers}), 'ran: helper');
        });

        it('should include full id', function() {
          shouldCompileTo('{{#foo.helper}}{{/foo.helper}}', [{foo: {}}, helpers], 'missing: foo.helper');
        });

        it('should include full id if a hash is passed', function() {
          shouldCompileTo('{{#foo.helper bar=baz}}{{/foo.helper}}', [{foo: {}}, helpers], 'helper missing: foo.helper');
        });
      });

      describe('name conflicts', function() {
        it("helpers take precedence over same-named context properties", function() {
          var template = CompilerContext.compile("{{goodbye}} {{cruel world}}");

          var helpers = {
            goodbye: function() {
              return this.goodbye.toUpperCase();
            },

            cruel: function(world) {
              return "cruel " + world.toUpperCase();
            }
          };

          var context = {
            goodbye: "goodbye",
            world: "world"
          };

          var result = template(context, {helpers: helpers});
          equals(result, "GOODBYE cruel WORLD", "Helper executed");
        });

        it("helpers take precedence over same-named context properties$", function() {
          var template = CompilerContext.compile("{{#goodbye}} {{cruel world}}{{/goodbye}}");

          var helpers = {
            goodbye: function(options) {
              return this.goodbye.toUpperCase() + options.fn(this);
            },

            cruel: function(world) {
              return "cruel " + world.toUpperCase();
            }
          };

          var context = {
            goodbye: "goodbye",
            world: "world"
          };

          var result = template(context, {helpers: helpers});
          equals(result, "GOODBYE cruel WORLD", "Helper executed");
        });

        it("Scoped names take precedence over helpers", function() {
          var template = CompilerContext.compile("{{this.goodbye}} {{cruel world}} {{cruel this.goodbye}}");

          var helpers = {
            goodbye: function() {
              return this.goodbye.toUpperCase();
            },

            cruel: function(world) {
              return "cruel " + world.toUpperCase();
            }
          };

          var context = {
            goodbye: "goodbye",
            world: "world"
          };

          var result = template(context, {helpers: helpers});
          equals(result, "goodbye cruel WORLD cruel GOODBYE", "Helper not executed");
        });

        it("Scoped names take precedence over block helpers", function() {
          var template = CompilerContext.compile("{{#goodbye}} {{cruel world}}{{/goodbye}} {{this.goodbye}}");

          var helpers = {
            goodbye: function(options) {
              return this.goodbye.toUpperCase() + options.fn(this);
            },

            cruel: function(world) {
              return "cruel " + world.toUpperCase();
            }
          };

          var context = {
            goodbye: "goodbye",
            world: "world"
          };

          var result = template(context, {helpers: helpers});
          equals(result, "GOODBYE cruel WORLD goodbye", "Helper executed");
        });
      });
    });