plot.PEGResult: Plots the parsing result as a tree.

In mslegrand/pegr: PEG PARSER

Description

Plots a tree representing the result of applying a rule to a text input, when that result was obtained with the record parameter set to TRUE (Either by set_record_status or by as a parameter option in apply_rule)

Usage

## S3 method for class 'PEGResult'
plot(res, shadow = TRUE, show = "names",
  bg = ifelse(match(par("bg"), "transparent", 0), "white", par("bg")),
  border = TRUE, xpad = 1, ypad = 2.5, cex = 1, adj = 0.5, ...)

Arguments

res,	a result obtained from parsing with record=TRUE
shadow,	when set to TRUE, renders a shadow for all nodes. The default is TRUE
show,	a vector consisting of any combination of the following: "names" (default), When spefified displays the name (rule id) of the rule at that node( "args", When specified, displays the text consumed at that node "vals", When specified, displays the vaule returned that node "all", Displays all of the above

Note

The default value for show is "names".

Examples

peg<-new.parser()
  peg<-add_rule(peg, "A<-'a'")
  peg<-add_rule(peg, "B<-'b'")
  peg<-add_rule(peg, "D<-'d'")
  peg<-add_rule(peg, "C<-'c'")
  peg<-add_rule(peg,"ROOT<-A B C D")
  apply_rule(peg,"ROOT","abcd", record=TRUE)->res
  plot(res)
  plot(res, show="args")
  plot(res, show="vals")
  plot(res, show=c("names","args"))
  plot(res, show="all")

mslegrand/pegr documentation built on May 23, 2019, 7:53 a.m.