cache_find_block: Find the groups of expressions that should be processed...

View source: R/transform-block.R

cache_find_blockR Documentation

Find the groups of expressions that should be processed together

Description

Find the groups of expressions that should be processed together

Usage

cache_find_block(pd)

Arguments

pd

A top-level nest.

Details

We want blocks to be formed according to these rules:

  • Blocks should contain either cached or uncached expressions only. If a block contains cached expressions only, it does not have to be processed and can be returned immediately. If a block contains uncached expressions, it makes sense to put as many uncached expression in it, since processing one bigger block has less overhead than processing many smaller blocks.

  • Multiple expressions can sit on one row, e.g. in-line comment and commands separated with ";". This creates a problem when processing each expression separately because when putting them together, we need complicated handling of line breaks between them, as it is not a priori clear that there is a line break separating them. To avoid this, we put top-level expressions that sit on the same line into one block, so the assumption that there is a line break between each block of expressions holds.

  • All expressions in a stylerignore sequence must be in the same block. If that's not the case, the first expression in a block might not be a top-level terminal, but another top-level expression. apply_stylerignore() joins env_current$stylerignore, which contains only terminals, with the first expression in a stylerignore sequence, based on the first pos_id in that stylerignore sequence (first_pos_id_in_segment).


krlmlr/styler documentation built on July 10, 2024, 1:45 a.m.