match_expr: Produce an ast or parse graph of an expression
In machow/straw: Code to AST Mappings, and Vice-versa

Description Usage Arguments Value Examples

View source: R/straw.R

Produce an ast or parse graph of an expression

1	match_expr(g_parse, g_ast, parse_node, ast_node)

`g_parse`	Parse graph generated by create_parse_graph
`g_ast`	AST graph generated by create_parse_graph
`parse_node`	node from g_parse to search from
`ast_node`	node from g_ast to search from

A data.frame linking the graphs with columns parse_id, ast_id

exp <- parse(text = "if (x) 2 else a$'b'")
g <- create_parse_graph(parse(text = "if (x) 2 else a$'b'"))
plot(g, layout = layout.reingold.tilford)

g_ast <- create_parse_graph(exp, type = "ast")
plot(g_ast, layout = layout.reingold.tilford)

match_expr(g, g_ast, g[2,], g_ast[2,])