---
title: "Corner Cases"
author: "John Mount"
date: "`r Sys.Date()`"
output: rmarkdown::html_vignette
vignette: >
  %\VignetteIndexEntry{Corner Cases}
  %\VignetteEngine{knitr::rmarkdown}
  %\VignetteEncoding{UTF-8}
---

`wrapr::let()` is designed to get several important corner cases correct:
including substitutions that are disjoint from the expression and symbol swaps.

```{r exdisj}
library("wrapr")

X <- 1
Y <- 2

let(
 c(),
  debugPrint = TRUE,
  X + Y
)

let(
 c(),
  debugPrint = TRUE,
  subsMethod = 'langsubs',
  X + Y
)

let(
 c(),
  debugPrint = TRUE,
  subsMethod = 'stringsubs',
  X + Y
)

let(
 c(),
  debugPrint = TRUE,
  subsMethod = 'subsubs',
  X + Y
)
```

```{r exswap}
library("wrapr")

X <- 1
Y <- 2

let(
  c(X='Y', Y='X'),
  debugPrint = TRUE,
  X + Y
)

let(
  c(X='Y', Y='X'),
  debugPrint = TRUE,
  subsMethod = 'langsubs',
  X + Y
)

let(
  c(X='Y', Y='X'),
  debugPrint = TRUE,
  subsMethod = 'stringsubs',
  X + Y
)

let(
  c(X='Y', Y='X'),
  debugPrint = TRUE,
  subsMethod = 'subsubs',
  X + Y
)
```