grammar;

use crate::path::GenericPath;
use crate::path::GenericPathComponent;

pub PathList: Vec<GenericPath> = {
  => {
    Vec::new()
  },
  <mut left:(<PathNoColons> COLON)*> <right:PathNoColons> => {
    left.push(right);
    left
  },
};

pub PathListAllowingEmptyPaths: Vec<GenericPath> = {
  => vec![GenericPath {
    components: Vec::new(),
    starts_with_slash: false,
    ends_with_slash: false,
  }],
  PathNoColons => vec![<>],
  <mut left:PathListAllowingEmptyPaths> COLON => {
    left.push(GenericPath {
      components: Vec::new(),
      starts_with_slash: false,
      ends_with_slash: false,
    });
    left
  },
  <mut left:PathListAllowingEmptyPaths> COLON <right:PathNoColons> => {
    left.push(right);
    left
  },
}

pub PathNoColons: GenericPath = {
  SLASH => GenericPath {
    components: Vec::new(),
    starts_with_slash: true,
    ends_with_slash: true,
  },
  <PathNoColons2> => GenericPath {
    components: <>,
    starts_with_slash: false,
    ends_with_slash: false,
  },
  <PathNoColons2> SLASH => GenericPath {
    components: <>,
    starts_with_slash: false,
    ends_with_slash: true,
  },
  SLASH <PathNoColons2> => GenericPath {
    components: <>,
    starts_with_slash: true,
    ends_with_slash: false,
  },
  SLASH <PathNoColons2> SLASH => GenericPath {
    components: <>,
    starts_with_slash: true,
    ends_with_slash: true,
  },
}

PathNoColons2: Vec<GenericPathComponent> = {
  <PathComponent> => vec![<>],
  <mut left:PathNoColons2> SLASH <right:PathComponent> => {
    left.push(right);
    left
  }
}

PathComponent: GenericPathComponent = {
  DOT => GenericPathComponent::CurrentDirectory,
  DOT_DOT => GenericPathComponent::ParentDirectory,
  <PATH_COMPONENT_NO_COLONS> =>
    GenericPathComponent::FileOrDirectoryName(<>.to_string())
}

// Whitespace is not allowed.
match {
  r"[^:/]+" => PATH_COMPONENT_NO_COLONS,

  r"/" => SLASH,

  ":" => COLON,

  "." => DOT,

  ".." => DOT_DOT,
}