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overview: |
Inverted Section tags and End Section tags are used in combination to wrap a
section of the template.
These tags' content MUST be a non-whitespace character sequence NOT
containing the current closing delimiter; each Inverted 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.
This section MUST NOT be rendered unless the data list is empty.
Inverted Section and End Section tags SHOULD be treated as standalone when
appropriate.
tests:
- name: Falsey
desc: Falsey sections should have their contents rendered.
data: { boolean: false }
template: '"{{^boolean}}This should be rendered.{{/boolean}}"'
expected: '"This should be rendered."'
- name: Truthy
desc: Truthy sections should have their contents omitted.
data: { boolean: true }
template: '"{{^boolean}}This should not be rendered.{{/boolean}}"'
expected: '""'
- name: Context
desc: Objects and hashes should behave like truthy values.
data: { context: { name: 'Joe' } }
template: '"{{^context}}Hi {{name}}.{{/context}}"'
expected: '""'
- name: List
desc: Lists should behave like truthy values.
data: { list: [ { n: 1 }, { n: 2 }, { n: 3 } ] }
template: '"{{^list}}{{n}}{{/list}}"'
expected: '""'
- name: Empty List
desc: Empty lists should behave like falsey values.
data: { list: [ ] }
template: '"{{^list}}Yay lists!{{/list}}"'
expected: '"Yay lists!"'
- name: Doubled
desc: Multiple inverted sections per template should be permitted.
data: { bool: false, two: 'second' }
template: |
{{^bool}}
* first
{{/bool}}
* {{two}}
{{^bool}}
* third
{{/bool}}
expected: |
* first
* second
* third
- name: Nested (Falsey)
desc: Nested falsey sections should have their contents rendered.
data: { bool: false }
template: "| A {{^bool}}B {{^bool}}C{{/bool}} D{{/bool}} E |"
expected: "| A B C D E |"
- name: Nested (Truthy)
desc: Nested truthy sections should be omitted.
data: { bool: true }
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}}Cannot find key 'missing'!{{/missing}}]"
expected: "[Cannot find key 'missing'!]"
# Dotted Names
- name: Dotted Names - Truthy
desc: Dotted names should be valid for Inverted Section tags.
data: { a: { b: { c: true } } }
template: '"{{^a.b.c}}Not Here{{/a.b.c}}" == ""'
expected: '"" == ""'
- name: Dotted Names - Falsey
desc: Dotted names should be valid for Inverted Section tags.
data: { a: { b: { c: false } } }
template: '"{{^a.b.c}}Not Here{{/a.b.c}}" == "Not Here"'
expected: '"Not Here" == "Not Here"'
- name: Dotted Names - Broken Chains
desc: Dotted names that cannot be resolved should be considered falsey.
data: { a: { } }
template: '"{{^a.b.c}}Not Here{{/a.b.c}}" == "Not Here"'
expected: '"Not Here" == "Not Here"'
# Whitespace Sensitivity
- name: Surrounding Whitespace
desc: Inverted sections should not alter surrounding whitespace.
data: { boolean: false }
template: " | {{^boolean}}\t|\t{{/boolean}} | \n"
expected: " | \t|\t | \n"
- name: Internal Whitespace
desc: Inverted should not alter internal whitespace.
data: { boolean: false }
template: " | {{^boolean}} {{! Important Whitespace }}\n {{/boolean}} | \n"
expected: " | \n | \n"
- name: Indented Inline Sections
desc: Single-line sections should not alter surrounding whitespace.
data: { boolean: false }
template: " {{^boolean}}NO{{/boolean}}\n {{^boolean}}WAY{{/boolean}}\n"
expected: " NO\n WAY\n"
- name: Standalone Lines
desc: Standalone lines should be removed from the template.
data: { boolean: false }
template: |
| This Is
{{^boolean}}
|
{{/boolean}}
| A Line
expected: |
| This Is
|
| A Line
- name: Standalone Indented Lines
desc: Standalone indented lines should be removed from the template.
data: { boolean: false }
template: |
| This Is
{{^boolean}}
|
{{/boolean}}
| A Line
expected: |
| This Is
|
| A Line
- name: Standalone Line Endings
desc: '"\r\n" should be considered a newline for standalone tags.'
data: { boolean: false }
template: "|\r\n{{^boolean}}\r\n{{/boolean}}\r\n|"
expected: "|\r\n|"
# Whitespace Insensitivity
- name: Padding
desc: Superfluous in-tag whitespace should be ignored.
data: { boolean: false }
template: '|{{^ boolean }}={{/ boolean }}|'
expected: '|=|'
|
