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|
overview: |
Section tags and End Section tags are used in combination to wrap a section
of the template for iteration
These tags' content MUST be a non-whitespace character sequence NOT
containing the current closing delimiter; each Section tag MUST be followed
by an End Section tag with the same content within the same section.
This tag's content names the data to replace the tag. Name resolution is as
follows:
1) Split the name on periods; the first part is the name to resolve, any
remaining parts should be retained.
2) Walk the context stack from top to bottom, finding the first context
that is a) a hash containing the name as a key OR b) an object responding
to a method with the given name.
3) If the context is a hash, the data is the value associated with the
name.
4) If the context is an object and the method with the given name has an
arity of 1, the method SHOULD be called with a String containing the
unprocessed contents of the sections; the data is the value returned.
5) Otherwise, the data is the value returned by calling the method with
the given name.
6) If any name parts were retained in step 1, each should be resolved
against a context stack containing only the result from the former
resolution. If any part fails resolution, the result should be considered
falsey, and should interpolate as the empty string.
If the data is not of a list type, it is coerced into a list as follows: if
the data is truthy (e.g. `!!data == true`), use a single-element list
containing the data, otherwise use an empty list.
For each element in the data list, the element MUST be pushed onto the
context stack, the section MUST be rendered, and the element MUST be popped
off the context stack.
Section and End Section tags SHOULD be treated as standalone when
appropriate.
tests:
- name: Truthy
desc: Truthy sections should have their contents rendered.
data: { boolean: true }
template: '"{{#boolean}}This should be rendered.{{/boolean}}"'
expected: '"This should be rendered."'
- name: Falsey
desc: Falsey sections should have their contents omitted.
data: { boolean: false }
template: '"{{#boolean}}This should not be rendered.{{/boolean}}"'
expected: '""'
- name: Context
desc: Objects and hashes should be pushed onto the context stack.
data: { context: { name: 'Joe' } }
template: '"{{#context}}Hi {{name}}.{{/context}}"'
expected: '"Hi Joe."'
- name: Deeply Nested Contexts
desc: All elements on the context stack should be accessible.
data:
a: { one: 1 }
b: { two: 2 }
c: { three: 3 }
d: { four: 4 }
e: { five: 5 }
template: |
{{#a}}
{{one}}
{{#b}}
{{one}}{{two}}{{one}}
{{#c}}
{{one}}{{two}}{{three}}{{two}}{{one}}
{{#d}}
{{one}}{{two}}{{three}}{{four}}{{three}}{{two}}{{one}}
{{#e}}
{{one}}{{two}}{{three}}{{four}}{{five}}{{four}}{{three}}{{two}}{{one}}
{{/e}}
{{one}}{{two}}{{three}}{{four}}{{three}}{{two}}{{one}}
{{/d}}
{{one}}{{two}}{{three}}{{two}}{{one}}
{{/c}}
{{one}}{{two}}{{one}}
{{/b}}
{{one}}
{{/a}}
expected: |
1
121
12321
1234321
123454321
1234321
12321
121
1
- name: List
desc: Lists should be iterated; list items should visit the context stack.
data: { list: [ { item: 1 }, { item: 2 }, { item: 3 } ] }
template: '"{{#list}}{{item}}{{/list}}"'
expected: '"123"'
- name: Empty List
desc: Empty lists should behave like falsey values.
data: { list: [ ] }
template: '"{{#list}}Yay lists!{{/list}}"'
expected: '""'
- name: Doubled
desc: Multiple sections per template should be permitted.
data: { bool: true, two: 'second' }
template: |
{{#bool}}
* first
{{/bool}}
* {{two}}
{{#bool}}
* third
{{/bool}}
expected: |
* first
* second
* third
- name: Nested (Truthy)
desc: Nested truthy sections should have their contents rendered.
data: { bool: true }
template: "| A {{#bool}}B {{#bool}}C{{/bool}} D{{/bool}} E |"
expected: "| A B C D E |"
- name: Nested (Falsey)
desc: Nested falsey sections should be omitted.
data: { bool: false }
template: "| A {{#bool}}B {{#bool}}C{{/bool}} D{{/bool}} E |"
expected: "| A E |"
- name: Context Misses
desc: Failed context lookups should be considered falsey.
data: { }
template: "[{{#missing}}Found key 'missing'!{{/missing}}]"
expected: "[]"
# Implicit Iterators
- name: Implicit Iterator - String
desc: Implicit iterators should directly interpolate strings.
data:
list: [ 'a', 'b', 'c', 'd', 'e' ]
template: '"{{#list}}({{.}}){{/list}}"'
expected: '"(a)(b)(c)(d)(e)"'
- name: Implicit Iterator - Integer
desc: Implicit iterators should cast integers to strings and interpolate.
data:
list: [ 1, 2, 3, 4, 5 ]
template: '"{{#list}}({{.}}){{/list}}"'
expected: '"(1)(2)(3)(4)(5)"'
- name: Implicit Iterator - Decimal
desc: Implicit iterators should cast decimals to strings and interpolate.
data:
list: [ 1.10, 2.20, 3.30, 4.40, 5.50 ]
template: '"{{#list}}({{.}}){{/list}}"'
expected: '"(1.1)(2.2)(3.3)(4.4)(5.5)"'
# Dotted Names
- name: Dotted Names - Truthy
desc: Dotted names should be valid for Section tags.
data: { a: { b: { c: true } } }
template: '"{{#a.b.c}}Here{{/a.b.c}}" == "Here"'
expected: '"Here" == "Here"'
- name: Dotted Names - Falsey
desc: Dotted names should be valid for Section tags.
data: { a: { b: { c: false } } }
template: '"{{#a.b.c}}Here{{/a.b.c}}" == ""'
expected: '"" == ""'
- name: Dotted Names - Broken Chains
desc: Dotted names that cannot be resolved should be considered falsey.
data: { a: { } }
template: '"{{#a.b.c}}Here{{/a.b.c}}" == ""'
expected: '"" == ""'
# Whitespace Sensitivity
- name: Surrounding Whitespace
desc: Sections should not alter surrounding whitespace.
data: { boolean: true }
template: " | {{#boolean}}\t|\t{{/boolean}} | \n"
expected: " | \t|\t | \n"
- name: Internal Whitespace
desc: Sections should not alter internal whitespace.
data: { boolean: true }
template: " | {{#boolean}} {{! Important Whitespace }}\n {{/boolean}} | \n"
expected: " | \n | \n"
- name: Standalone Lines
desc: Standalone lines should be removed from the template.
data: { boolean: true }
template: |
| This Is
{{#boolean}}
|
{{/boolean}}
| A Line
expected: |
| This Is
|
| A Line
- name: Indented Standalone Lines
desc: Indented standalone lines should be removed from the template.
data: { boolean: true }
template: |
| This Is
{{#boolean}}
|
{{/boolean}}
| A Line
expected: |
| This Is
|
| A Line
# Whitespace Insensitivity
- name: Padding
desc: Superfluous in-tag whitespace should be ignored.
data: { boolean: true }
template: '|{{# boolean }}={{/ boolean }}|'
expected: '|=|'
|
