yaml_protocol — Logtalk 3.100.1

protocol

# `yaml_protocol`

YAML parser and generator protocol.

Availability:
`logtalk_load(yaml(loader))`
Author: Paulo Moura
Version: 1:0:0
Date: 2026-01-31
Compilation flags:
`static`
Dependencies:
(none)
Remarks:
(none)
Inherited public predicates:
(none)

## Public predicates

### `parse/2`

Parses YAML content read from the given source (`file(Path)`, `stream(Stream)`, `codes(Codes)`, `chars(Chars)`, or `atom(Atom)`) into a ground term representing the parsed YAML data.

Compilation flags:
`static`
Template:
`parse(Source,YAML)`
Mode and number of proofs:
`parse(++compound,--ground)` - `one_or_error`
Exceptions:
`Source` is a variable:
`instantiation_error`
`Source` is neither a variable nor a valid source:
`domain_error(yaml_source,Source)`

### `parse_all/2`

Parses all YAML documents from the given source (`file(Path)`, `stream(Stream)`, `codes(Codes)`, `chars(Chars)`, or `atom(Atom)`) into a list of ground terms. Documents are separated by `---` markers and optionally terminated by `...` markers.

Compilation flags:
`static`
Template:
`parse_all(Source,YAMLs)`
Mode and number of proofs:
`parse_all(++compound,--list(ground))` - `one_or_error`
Exceptions:
`Source` is a variable:
`instantiation_error`
`Source` is neither a variable nor a valid source:
`domain_error(yaml_source,Source)`

### `generate/2`

Generates YAML output using the representation specified in the first argument (`file(Path)`, `stream(Stream)`, `codes(Codes)`, `chars(Chars)`, or `atom(Atom)`) from the ground YAML term in the second argument.

Compilation flags:
`static`
Template:
`generate(Sink,YAML)`
Mode and number of proofs:
`generate(++compound,+ground)` - `one_or_error`
Exceptions:
`Sink` is a variable:
`instantiation_error`
`YAML` is a variable:
`instantiation_error`
`YAML` is not a valid YAML term:
`domain_error(yaml_term,YAML)`
`Sink` cannot be generated:
`domain_error(yaml_sink,Sink)`

### `generate_all/2`

Generates YAML output with multiple documents separated by `---` markers using the representation specified in the first argument (`file(Path)`, `stream(Stream)`, `codes(Codes)`, `chars(Chars)`, or `atom(Atom)`) from the list of ground YAML terms in the second argument.

Compilation flags:
`static`
Template:
`generate_all(Sink,YAMLs)`
Mode and number of proofs:
`generate_all(++compound,+list(ground))` - `one_or_error`
Exceptions:
`Sink` is a variable:
`instantiation_error`
`YAMLs` is a variable:
`instantiation_error`
`YAMLs` is not a list:
`type_error(list,YAMLs)`
An element of `YAMLs` is not a valid YAML term:
`domain_error(yaml_term,Term)`
`Sink` cannot be generated:
`domain_error(yaml_sink,Sink)`

## Protected predicates

(none)

## Private predicates

(none)

## Operators

(none)