lexl_igraph: Plot the parse tree of a formula
In nacnudus/lexl: Tokenise 'Excel' Formulas

Description Usage Arguments See Also Examples

Requires the igraph and ggraph packages, which you can install with install.packages(c("igraph", "ggraph")). Draws a simple tree plot of the parse tree, showing parent-child relationships, tokens and types.

The utility functions lexl_edges(), lexl_vertices(), and lexl_igraph() compute each stage in plotting the final graph.

## S3 method for class 'lexl'
plot(x, ...)

lexl_edges(x)

lexl_vertices(x)

lexl_igraph(x)

`x`	parse tree from `lexl()`
`...`	ignored, for consistency with the base `plot()` function

lexl::lex_xl(), lexl::demo_lexl()

x <- lex_xl("MIN(3,MAX(2,A1))")

lexl_edges(x)
lexl_vertices(x)

if (interactive() && require(igraph, quietly = TRUE)) {
  lexl_igraph(x)
}

if (interactive()
    && require(igraph, quietly = TRUE)
    && require(ggraph, quietly = TRUE)) {
  plot(x)
}