yamleam/exact

Parse YAML with every number kept exactly as written.

parse and parse_documents read the same YAML as yamleam.parse_raw and yamleam.parse_documents_raw, and return an ExactNode tree. A plain scalar that parse_raw resolves to YamlInt or YamlFloat is an ExactNumber holding its own text, so 0.0323, 12.50 or a 30-digit integer reach you without passing through a Float. Everything else is the same: 01234, 0x1F, .inf and quoted "1.5" are strings in both trees.

import yamleam/exact
import yamleam/node.{ExactMap, ExactNumber}

let assert Ok(ExactMap([#("rate", ExactNumber(text))])) =
  exact.parse("rate: 0.0323")
// text == "0.0323"; hand it to your decimal library

The text is the scalar as written, sign and exponent included (+1.5e3), so a decimal parser decides for itself which forms it accepts.

Values

parse

</>

pub fn parse(
  source: String,
) -> Result(node.ExactNode, error.YamlError)

Parse a YAML source string into an ExactNode tree. Reads exactly one document, and fails as yamleam.parse_raw does.

parse_documents

</>

pub fn parse_documents(
  source: String,
) -> Result(List(node.ExactNode), error.YamlError)

Parse a YAML stream of one or more documents into ExactNode trees, as yamleam.parse_documents_raw does.

to_yaml_node

</>

pub fn to_yaml_node(node: node.ExactNode) -> node.YamlNode

The YamlNode tree for an ExactNode tree: each number resolves to YamlInt or YamlFloat, as yamleam.parse_raw would have returned it.