R/makeValidCode.R

In dplyrAssist: RStudio Addin for Teaching and Learning Data Manipulation Using 'dplyr'

#' Make valid R code
#'
#'@param temp A character vector to make a valid code
#'@return A valid R codes
#'@export
#'@examples
#'require(tidyverse)
#'temp <- "iris %>%
#'group_by(Species) %>%
#'summarize_all(mean)
#'
#'table1"
#'makeValid(temp)
makeValid=function(temp){
   no=checkInvalid(temp)
   no
   if(!is.null(no)) {
       result=c()
       if(no>1) result=temp[1:(no-1)]
       if(no<length(temp)) result=c(result,paste0(temp[no],temp[no+1]))
       if(no<(length(temp)-1)) result=c(result,temp[(no+2):length(temp)])

       (temp=result)
       if(!is.null(temp)) result=makeValid(temp)
   } else{
       result=temp
   }
   result
}


#' Check the validity of code
#'
#'@param temp A character string to check validity
#'@return The position of the first invalid code or NULL
#'@export
#'@examples
#'checkInvalid(c("iris","irisssss"))
checkInvalid <- function(temp) {
     res=c()

     for(i in 1:length(temp)){
          result<-c()
          result<-tryCatch(eval(parse(text=temp[i])),
                           error=function(e) return("error"),
                           warning=function(w) return("warning"))

          if(!is.null(result)){
               if(identical(result,"error")){
                    res=i
                    break
               }
          }
     }
     res
}



#' Make valid R code
#'
#'@param codes A character vector to make a valid code
#'@return A valid R codes
#'@export
#'@examples
#'require(tidyverse)
#'temp <- "iris %>%
#'group_by(Species) %>%
#'summarize_all(mean)
#'
#'table1"
#'makeValidCode(temp)
makeValidCode<-function(codes){
    temp=unlist(stringr::str_split(codes,"\n"))
    temp=temp[nchar(temp)>0]
    makeValid(temp)
}


#' Differentiate the R code
#'
#' @param vcodes A character vector to differentiate
#' @return A character vector indicating whether the code returns text or plot
#' @export
#' @examples
#'require(tidyverse)
#'temp <-c("iris %>% group_by(Species) %>% summarize_all(mean)","table1")
#'codes2kind(temp)
codes2kind=function(vcodes){
    result=c()
    if(!is.null(vcodes)) for(i in 1:length(vcodes)){
        temp=eval(parse(text=vcodes[i]))
        if(is.null(temp)) {
            kind="plot"
        } else if("ggplot" %in% class(temp)) {
            kind="plot"
        } else {
            kind="text"
        }
        result=c(result,kind)
    }
    result
}


#' Detect the valid data
#'
#' @param codes A character vector to detect
#' @return The last data in codes
#' @export
#' @examples
#'require(tidyverse)
#'temp <- "iris %>%
#'group_by(Species) %>%
#'summarize_all(mean)
#'
#'table1"
#'findData(temp)
findData=function(codes){
    result=NULL
    (vcodes=makeValidCode(codes))
    (kind=codes2kind(vcodes))
    (textcodes=vcodes[grep("text",kind)])
    if(length(textcodes)>0){
        eval(parse(text=vcodes))
        for(i in length(textcodes):1){
            result<-eval(parse(text=textcodes[i]))
            if(any((class(result) %in% c("tbl_df","tibble","data.frame")))) break
        }
    }
    result
}