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WIP: Possible fix for #1252: Using @partial-block twice in a template not possible #1290

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merged 2 commits into from
Feb 14, 2017
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WIP: Possible fix for #1252: Using @partial-block twice in a template not possible #1290

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c419c3e
Fix for #1252: Using @partial-block twice in a template not possible
nknapp Dec 30, 2016
81ae953
Add more tests for partial-blocks and inline partials
nknapp Jan 2, 2017
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24 changes: 14 additions & 10 deletions lib/handlebars/runtime.js
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Original file line number Diff line number Diff line change
Expand Up @@ -210,12 +210,7 @@ export function wrapProgram(container, i, fn, data, declaredBlockParams, blockPa
export function resolvePartial(partial, context, options) {
if (!partial) {
if (options.name === '@partial-block') {
let data = options.data;
while (data['partial-block'] === noop) {
data = data._parent;
}
partial = data['partial-block'];
data['partial-block'] = noop;
partial = options.data['partial-block'];
} else {
partial = options.partials[options.name];
}
Expand All @@ -228,6 +223,8 @@ export function resolvePartial(partial, context, options) {
}

export function invokePartial(partial, context, options) {
// Use the current closure context to save the partial-block if this partial
const currentPartialBlock = options.data && options.data['partial-block'];
options.partial = true;
if (options.ids) {
options.data.contextPath = options.ids[0] || options.data.contextPath;
Expand All @@ -236,10 +233,17 @@ export function invokePartial(partial, context, options) {
let partialBlock;
if (options.fn && options.fn !== noop) {
options.data = createFrame(options.data);
partialBlock = options.data['partial-block'] = options.fn;

if (partialBlock.partials) {
options.partials = Utils.extend({}, options.partials, partialBlock.partials);
// Wrapper function to get access to currentPartialBlock from the closure
let fn = options.fn;
partialBlock = options.data['partial-block'] = function partialBlockWrapper(context, options) {
// Restore the partial-block from the closure for the execution of the block
// i.e. the part inside the block of the partial call.
options.data = createFrame(options.data);
options.data['partial-block'] = currentPartialBlock;
return fn(context, options);
};
if (fn.partials) {
options.partials = Utils.extend({}, options.partials, fn.partials);
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So, previously, fn === partialBlock. Are you sure that we don't depend on that elsewhere?

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@nknapp nknapp Jan 2, 2017 •
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I have searched the lib-folder and the src-folder for occurences of the string partial-block in the tmp/issue-1252-branch and the only matches are in the functions invokePartial and resolvePartial. Those functions do not check for fn === partialBlock.

But no, I cannot be completely sure. I have just started digging in the internals of Handlebars, there might be something I don't see. I'm pretty confident though. Especially since all tests (including your new ones) are passing.

}
}

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95 changes: 95 additions & 0 deletions spec/partials.js
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Expand Up @@ -249,13 +249,46 @@ describe('partials', function() {
true,
'success');
});
it('should be able to render the partial-block twice', function() {
shouldCompileToWithPartials(
'{{#> dude}}success{{/dude}}',
[{}, {}, {dude: '{{> @partial-block }} {{> @partial-block }}'}],
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I'd like to see a few more test cases. I can think of at least two that we need:

  • Multiple partial blocks in a nested partial block
    • Given these templates
    <outer>{{#> nested}}<outer-block>{{> @partial-block}} {{> @partial-block}}</outer-block>{{/nested}}</outer>
    <nested>{{> @partial-block}}</nested>
    <template>{{#> outer}}{{value}}{{/outer}}</template>
    • rendering with { value: 'success' } should produce
    <template><outer><nested><outer-block>success success</outer-block></nested></outer></template>
  • Multiple partial blocks at different nesting levels
    • Given these templates
    <outer>{{#> nested}}<outer-block>{{> @partial-block}}</outer-block>{{/nested}}{{> @partial-block}}</outer>
    <nested>{{> @partial-block}}</nested>
    <template>{{#> outer}}{{value}}{{/outer}}</template>
    • rendering with { value: 'success' } should produce
    <template><outer><nested><outer-block>success</outer-block></nested>success</outer></template>

We probably also want to test that inline partials behave as expected when combined with multiple @partial-block invocations.

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I can add those tests.

true,
'success success');
});
it('should render block from partial with context', function() {
shouldCompileToWithPartials(
'{{#> dude}}{{value}}{{/dude}}',
[{context: {value: 'success'}}, {}, {dude: '{{#with context}}{{> @partial-block }}{{/with}}'}],
true,
'success');
});
it('should allow the #each-helper to be used along with partial-blocks', function() {
shouldCompileToWithPartials(
'<template>{{#> list value}}value = {{.}}{{/list}}</template>',
[
{value: ['a', 'b', 'c']},
{},
{
list: '<list>{{#each .}}<item>{{> @partial-block}}</item>{{/each}}</list>'
}
],
true,
'<template><list><item>value = a</item><item>value = b</item><item>value = c</item></list></template>');
});
it('should render block from partial with context (twice)', function() {
shouldCompileToWithPartials(
'{{#> dude}}{{value}}{{/dude}}',
[
{context: {value: 'success'}},
{},
{
dude: '{{#with context}}{{> @partial-block }} {{> @partial-block }}{{/with}}'
}
],
true,
'success success');
});
it('should render block from partial with context', function() {
shouldCompileToWithPartials(
'{{#> dude}}{{../context/value}}{{/dude}}',
Expand Down Expand Up @@ -284,6 +317,50 @@ describe('partials', function() {
true,
'<template><outer><nested><outer-block>success</outer-block></nested></outer></template>');
});
it('should render nested partial blocks at different nesting levels', function() {
shouldCompileToWithPartials(
'<template>{{#> outer}}{{value}}{{/outer}}</template>',
[
{value: 'success'},
{},
{
outer: '<outer>{{#> nested}}<outer-block>{{> @partial-block}}</outer-block>{{/nested}}{{> @partial-block}}</outer>',
nested: '<nested>{{> @partial-block}}</nested>'
}
],
true,
'<template><outer><nested><outer-block>success</outer-block></nested>success</outer></template>');
});
it('should render nested partial blocks at different nesting levels (twice)', function() {
shouldCompileToWithPartials(
'<template>{{#> outer}}{{value}}{{/outer}}</template>',
[
{value: 'success'},
{},
{
outer: '<outer>{{#> nested}}<outer-block>{{> @partial-block}} {{> @partial-block}}</outer-block>{{/nested}}{{> @partial-block}}+{{> @partial-block}}</outer>',
nested: '<nested>{{> @partial-block}}</nested>'
}
],
true,
'<template><outer><nested><outer-block>success success</outer-block></nested>success+success</outer></template>');
});
it('should render nested partial blocks (twice at each level)', function() {
shouldCompileToWithPartials(
'<template>{{#> outer}}{{value}}{{/outer}}</template>',
[
{value: 'success'},
{},
{
outer: '<outer>{{#> nested}}<outer-block>{{> @partial-block}} {{> @partial-block}}</outer-block>{{/nested}}</outer>',
nested: '<nested>{{> @partial-block}}{{> @partial-block}}</nested>'
}
],
true,
'<template><outer>' +
'<nested><outer-block>success success</outer-block><outer-block>success success</outer-block></nested>' +
'</outer></template>');
});
});

describe('inline partials', function() {
Expand Down Expand Up @@ -332,6 +409,24 @@ describe('partials', function() {
true,
'<inner><outer-block>success</outer-block></inner>');
});
it('should render nested inline partials with partial-blocks on different nesting levels', function() {
shouldCompileToWithPartials(
'{{#*inline "outer"}}{{#>inner}}<outer-block>{{>@partial-block}}</outer-block>{{/inner}}{{>@partial-block}}{{/inline}}' +
'{{#*inline "inner"}}<inner>{{>@partial-block}}</inner>{{/inline}}' +
'{{#>outer}}{{value}}{{/outer}}',
[{value: 'success'}, {}, {}],
true,
'<inner><outer-block>success</outer-block></inner>success');
});
it('should render nested inline partials (twice at each level)', function() {
shouldCompileToWithPartials(
'{{#*inline "outer"}}{{#>inner}}<outer-block>{{>@partial-block}} {{>@partial-block}}</outer-block>{{/inner}}{{/inline}}' +
'{{#*inline "inner"}}<inner>{{>@partial-block}}{{>@partial-block}}</inner>{{/inline}}' +
'{{#>outer}}{{value}}{{/outer}}',
[{value: 'success'}, {}, {}],
true,
'<inner><outer-block>success success</outer-block><outer-block>success success</outer-block></inner>');
});
});

it('should pass compiler flags', function() {
Expand Down