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Diff of /pkg/inlinedocs/R/parsers.R

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revision 128, Wed Sep 22 09:24:39 2010 UTC revision 186, Fri Jan 14 18:43:36 2011 UTC
# Line 8  Line 8 
8  ### combine lists by adding elements or adding to existing elements  ### combine lists by adding elements or adding to existing elements
9  combine.list <- function(x,y){  combine.list <- function(x,y){
10    toadd <- !names(y)%in%names(x)    toadd <- !names(y)%in%names(x)
11    toup <- names(y)[names(y)%in%names(x)]    toup <- names(y)[!toadd]
12      if("doc"%in%names(x))return(x$doc)
13      if("doc"%in%names(y))return(y$doc)
14    x[names(y)[toadd]] <- y[toadd]    x[names(y)[toadd]] <- y[toadd]
15    for(up in toup)x[[up]] <- combine(x[[up]],y[[up]])    for(up in toup)x[[up]] <- combine(x[[up]],y[[up]])
16    return(x)    return(x)
# Line 24  Line 26 
26  (comments  (comments
27  ### Character vector of prefixed comment lines.  ### Character vector of prefixed comment lines.
28   ){   ){
29    paste(gsub(prefix,"",comments),collapse="\n")    gsub(prefix,"",comments)
30  ### String without prefixes or newlines.  ### String without prefixes or newlines.
31  }  }
32    
33    forall <- function
34  ### For each object in the package that satisfies the criterion  ### For each object in the package that satisfies the criterion
35  ### checked by subfun, parse source using FUN and return the resulting  ### checked by subfun, parse source using FUN and return the resulting
36  ### documentation list.  ### documentation list.
 forall <- function  
37  (FUN,  (FUN,
38  ### Function to apply to each element in the package.  ### Function to apply to each element in the package.
39   subfun=function(x)TRUE   subfun=function(x)TRUE
# Line 39  Line 41 
41  ### is.function. subfun(x)==TRUE means FUN will be applied to x and  ### is.function. subfun(x)==TRUE means FUN will be applied to x and
42  ### the result will be returned.  ### the result will be returned.
43   ){   ){
44    function(objs,docs,...){    FUN <- FUN
45      f <- function(objs,docs,...){
46      objs <- objs[sapply(objs,subfun)]      objs <- objs[sapply(objs,subfun)]
47      L <- list()      L <- list()
48        on.exit(cat(sprintf("Parser Function failed on %s\n",N)))
49      for(N in names(docs)){      for(N in names(docs)){
50        o <- objs[[N]]        o <- objs[[N]]
51        L[[N]] <- FUN(src=attr(o,"source"),        L[[N]] <- FUN(src=attr(o,"source"),
52                      name=N,objs=objs,o=o,docs=docs,doc=docs[[N]],...)                      name=N,objs=objs,o=o,docs=docs,doc=docs[[N]],...)
53      }      }
54        on.exit()## remove warning message
55      L      L
56    }    }
57      class(f) <- c("allfun","function")
58      f
59  ### A Parser Function.  ### A Parser Function.
60  }  }
61    
62    ### Print method for functions constructed using forall.
63    print.allfun <- function(x,...){
64      e <- environment(x)
65      cat("Function to apply to every element.\nselector:")
66      print(e$subfun)
67      cat("processor:")
68      print(e$FUN)
69    }
70    
71  ### For each function in the package, do something.  ### For each function in the package, do something.
72  forfun <- function(FUN)forall(FUN,is.function)  forfun <- function(FUN)forall(FUN,is.function)
73    
74  ### Parsers for each object/function that are constructed  kill.prefix.whitespace <- function
75  ### automatically. This is a named list, each element is a list of 2  ### Figure out what the whitespace preceding the example code is, and
76  ### elements: forfun/forall, then a parser function for an individual  ### then delete that from every line.
77  ### object.  (ex
78  forall.parsers <-  ### character vector of example code lines.
79    list(## Extract lots of info from normal functions.   ){
80         parsefun=list(forfun,function(src,name,...){    tlines <- gsub("\\s*","",ex)
81           extract.docs.fun(src,name)    ##tlines <- gsub("#.*","",tlines)
82         }),    prefixes <- unique(gsub("\\S.*","",ex[tlines!=""]))
83         ## Fill in author from DESCRIPTION and titles.    FIND <- prefixes[which.min(nchar(prefixes))]
84         author.from.description=list(forall,function(desc,...){    ## Eliminate leading tabulations or 2/4 spaces
85           list(author=desc[,"Maintainer"])    sub(FIND, "", ex)
86         }),  ### Character vector of code lines with preceding whitespace removed.
87         ## The format section sometimes causes problems, so erase it.  }
88         erase.format=list(forall,function(...){  
89           list(format="")  examples.after.return <- function
90         }),  ### Get examples from inline definitions after return()
91         ## Convert the function name to a title.  ### PhG: this does not work well! Think of these situations:
92         title.from.name=list(forall,function(name,doc,...){  ### 1) You have multiple return() in the code of your function,
93           if("title"%in%names(doc))list() else  ### 2) You have return() appearing is some example code, ...
94           list(title=gsub("[._]"," ",name))  ### I can hardly propose a hack here. The whole code of the function
95         }),  ### must be parsed, and one must determine which one is the last line
96         ## PhG: it is tests/FUN.R!!! I would like more flexibility here  ### of code that is actually executed.
97         ## please, let me choose which dir to use for examples!  ###
98         ## Get examples for FUN from the file tests/FUN.R  ### I make two propositions here
99         examples.from.testfile=list(forfun,function(name,...){  ### 1) to keep the same mechanism that has the advantage of simplicity
100           tsubdir <- getOption("inlinedocs.exdir")  ###    but to use a special tag
101           if (is.null(tsubdir)) tsubdir <- "tests"       # Default value  ###    ##examples<< or #{{{examples to separate
102           tfile <- file.path("..",tsubdir,paste(name,".R",sep=""))  ###    function code from examples explicitly, and
103           if(file.exists(tfile))  ### 2) to place the example in an "ex" attribute
104             list(examples=paste(readLines(tfile),collapse="\n"))  ###    attached to the function
105           else list()  ###    (see next parser). That solution will be also interesting for
106         }),  ###    documenting datasets, something not done yet by inlinedocs!
107         ## Get examples from inline definitions after return()  (src,name="",...) {
        ## PhG: this does not work well! Think of these situations:  
        ## 1) You have multiple return() in the code of your function,  
        ## 2) You have return() appearing is some example code, ...  
        ## I can hardly propose a hack here. The whole code of the function  
        ## must be parsed, and one must determine which one is the last line  
        ## of code that is actually executed.  
        ##  
        ## I make two propositions here  
        ## 1) to keep the same mechanism that has the advantage of simplicity  
        ##    but to use a special tag  
        ##examples<< or #{{{examples to separate  
        ##    function code from examples explicitly, and  
        ## 2) to place the example in an "ex" attribute  
        ##    attached to the function  
        ##    (see next parser). That solution will be also interesting for  
        ##    documenting datasets, something not done yet by inlinedocs!  
        examples.after.return = list(forfun,function(src,name="",...) {  
108           ## Look for the examples mark           ## Look for the examples mark
109           m <- grep("##examples<<|#\\{\\{\\{examples", src)    m <- grep("^\\s*(##examples<<|#\\{\\{\\{examples)", src)
110           if (!length(m)) return(list())           if (!length(m)) return(list())
111           if (length(m) > 1)           if (length(m) > 1)
112             warning("More than one examples tag for ", name,             warning("More than one examples tag for ", name,
# Line 131  Line 130 
130           ## Possibly eliminate a #}}} tag           ## Possibly eliminate a #}}} tag
131           ex <- ex[!grepl("#}}}", ex)]           ex <- ex[!grepl("#}}}", ex)]
132           ## Eliminate leading tabulations or four spaces           ## Eliminate leading tabulations or four spaces
133           prefixes <- gsub("(\\s*).*","\\1",ex,perl=TRUE)[grep("\\w",ex)]    ex <- kill.prefix.whitespace(ex)
          FIND <- prefixes[which.min(nchar(prefixes))]  
          ex <- sub(FIND,"",ex)  
134           ## Add an empty line before and after example           ## Add an empty line before and after example
135           ex <- c("", ex, "")           ex <- c("", ex, "")
136           ## Return examples and value           ## Return examples and value
137           list(examples = paste(ex, collapse = "\n"), value = value)    list(examples = ex, value = value)
        }),  
        ## PhG: here is what I propose for examples code in the 'ex' attribute  
        examples.in.attr = list(forall, function (name, o, ...) {  
          ex <- attr(o, "ex")  
          if (!is.null(ex)) {  
            ## Special case for code contained in a function  
            if (inherits(ex, "function")) {  
              ## If source is available, start from there  
              src <- attr(ex, "source")  
              if (!is.null(src)) {  
                ex <- src  
              } else { ## Use the body of the function  
                ex <- deparse(body(ex))  
              }  
              ## Eliminate leading and trailing code  
              ex <- ex[-c(1, length(ex))]  
              ## Eliminate leading tabulations or four spaces  
              ex <- sub("^\t|    ", "", ex)  
              ## Add an empty line before and after example  
              ex <- c("", ex, "")  
            }  
            list(examples = paste(ex, collapse = "\n"))  
          } else list()  
        })  
        )  
   
 ### List of parser functions that operate on single objects. This list  
 ### is useful for testing these functions.  
 lonely <- sapply(forall.parsers,function(L)L[[2]])  
 attr(lonely,"ex") <- function(){  
   lonely$parsefun(attr(extract.docs.file,"source"),"extract.docs.file")  
 }  
   
 extra.code.docs <- function # Extract documentation from code chunks  
 ### Parse R code to extract inline documentation from comments around  
 ### each function. These are not able to be retreived simply by  
 ### looking at the "source" attribute. This is a Parser Function that  
 ### can be used in the parser list of package.skeleton.dx(). TODO:  
 ### Modularize this into separate Parsers Functions for S4 classes,  
 ### prefixes, ##<<blocks, etc. Right now it is not very clean!  
 (code,  
 ### Code lines in a character vector containing multiple R objects to  
 ### parse for documentation.  
  objs,  
 ### The objects defined in the code.  
  ...  
 ### ignored  
  ){  
   parsed <- extract.file.parse(code)  
   extract.docs.try <- function(o,on)  
     {  
       ## Note: we could use parsed information here too, but that  
       ## would produce different results for setMethodS3 etc.  
       doc <- list()  
       if ( !is.null(parsed[[on]]) ){  
         if ( !is.na(parsed[[on]]@code[1]) ){ # no code given for generics  
           doc$definition <- paste(parsed[[on]]@code,collapse="\n")  
         }  
         if(!"description"%in%names(doc) && !is.na(parsed[[on]]@description) ){  
           doc$description <- parsed[[on]]@description  
         }  
         if ( "setMethodS3" == parsed[[on]]@created ){  
           # PhG: this may be wrong! It does not catch correctly how the method  
                   # must be splitted in case of methods containing dots. for instance,  
                   # as.data.frame.matrix must be split into: m1 = as.data.frame and  
                   # m2 = matrix... here you got m1 = as, and m2 = data.frame.matrix!!!  
                   pattern <- "^([^\\.]+)\\.(.*)$"  
           doc$s3method=c(m1 <- gsub(pattern,"\\1",on,perl=TRUE),  
               m2 <- gsub(pattern,"\\2",on,perl=TRUE))  
           if ( 0 < length(grep("\\W",m1,perl=TRUE)) ){  
                           m1 <- paste("`",m1,"`",sep="")  
           }  
           cat("S3method(",m1,",",m2,")\n",sep="")  
         }  
       }  
       if("title" %in% names(doc) && !"description" %in% names(doc) ){  
         ## For short functions having both would duplicate, but a  
         ## description is required. Therefore automatically copy title  
         ## across to avoid errors at package build time.  
         doc$description <- doc$title  
       }  
       doc  
     }  
   extract.docs <- function(on){  
     res <- try({o <- objs[[on]]  
                 extract.docs.try(o, on)},FALSE)  
     if(class(res)=="try-error"){  
       cat("Failed to extract docs for: ",on,"\n\n")  
       list()  
     } else if(0 == length(res) && inherits(objs[[on]],"standardGeneric")){  
       NULL  
     } else if(0 == length(res) && "function" %in% class(o)  
               && 1 == length(osource <- attr(o,"source"))  
               && 1 == length(grep(paste("UseMethod(",on,")",sep="\""),osource))  
               ){  
       ## phew - this should only pick up R.oo S3 generic definitions like:  
       ## attr(*, "source")= chr "function(...) UseMethod(\"select\")"  
       NULL  
     } else res  
   }  
   doc.names <- names(objs)  
   res <- sapply(doc.names,extract.docs,simplify=FALSE)  
   ## Special processing for S4 classes as they do not appear in normal ls()  
   for ( nn in names(parsed) ){  
     if ( parsed[[nn]]@created == "setClass" ){  
       S4class.docs <- extract.docs.setClass(parsed[[nn]])  
       docname <- paste(nn,"class",sep="-")  
       if ( is.null(res[[docname]]) ){  
         res[[docname]] <- S4class.docs  
         doc.names <- c(doc.names,docname)  
       } else {  
         stop(nn," appears as both S4 class and some other definition")  
       }  
     }  
   }  
   inherit.docs <- function(on){  
     in.res <- res[[on]]  
     if ( !is.null(parsed[[on]]) ){  
       for ( parent in parsed[[on]]@parent ){  
         if ( !is.na(parent) ){  
           if ( is.null(in.res) ){  
             in.res <- res[[parent]]  
           } else if ( parent %in% names(res) ){  
             parent.docs <- res[[parent]]  
             for ( nn in names(parent.docs) ){  
               if ( !nn %in% names(in.res) ){  
                 in.res[[nn]] <- parent.docs[[nn]]  
               }  
             }  
           }  
         }  
       }  
     }  
     invisible(in.res)  
   }  
   all.done <- FALSE  
   while ( !all.done ){  
     res1 <- sapply(doc.names,inherit.docs,simplify=FALSE)  
     all.done <- identical(res1,res)  
     res <- res1  
   }  
   ## now strip out any generics (which have value NULL in res):  
   res.not.null <- sapply(res,function(x){!is.null(x)})  
   if ( 0 < length(res.not.null) && length(res.not.null) < length(res) ){  
     res <- res[res.not.null]  
   }  
   res  
 ### named list of lists, one for each object to document.  
138  }  }
139    
140  ### List of parsers to use by default with package.skeleton.dx.  prefixed.lines <- structure(function(src,...){
141  default.parsers <-  ### The primary mechanism of inline documentation is via consecutive
142    c(extra.code.docs=extra.code.docs,  ### groups of lines matching the specified prefix regular expression
143      sapply(forall.parsers,function(L)L[[1]](L[[2]])),  ### "\code{^### }" (i.e. lines beginning with "\code{### }") are
144      edit.package.file=function(desc,...){  ### collected as follows into documentation sections:\describe{
145        in.details <- setdiff(colnames(desc),"Description")  ### \item{description}{group starting at line 2 in the code}
146        details <- paste(paste(in.details,": \\tab ",desc[,in.details],"\\cr",  ### \item{arguments}{group following each function argument}
147                               sep=""),collapse="\n")  ### \item{value}{group ending at the penultimate line of the code}}
148        L <-  ### These may be added to by use of the \code{##<<} constructs
149          list(list(title=desc[,"Title"],  ### described below.
150                    description=desc[,"Description"],    clines <- grep(prefix,src)
151                    `tabular{ll}`=details,    if(length(clines)==0)return(list())
                   author=desc[,"Maintainer"]))  
       names(L) <- paste(desc[,"Package"],"-package",sep="")  
       L  
     })  
   
 extract.docs.fun <- function # Extract documentation from a function  
 ### Given source code of a function, return a list describing inline  
 ### documentation in that source code.  
 (code,  
 ### The function to examine.  
  name.fun  
 ### The name of the function/chunk to use in warning messages.  
  ){  
   res <- list()  
   clines <- grep(prefix,code)  
   if(length(grep("#",code[1]))){  
     res$title <- gsub("[^#]*#\\s*(.*)","\\1",code[1],perl=TRUE)  
   }  
   if(length(clines) > 0){  
     ##details<<  
     ## The primary mechanism is that consecutive groups of lines matching  
     ## the specified prefix regular expression "\code{^### }" (i.e. lines  
     ## beginning with "\code{### }") are collected  
     ## as follows into documentation sections:\describe{  
     ## \item{description}{group starting at line 2 in the code}  
     ## \item{arguments}{group following each function argument}  
     ## \item{value}{group ending at the penultimate line of the code}}  
     ## These may be added to by use of the \code{##<<} constructs described  
     ## below.  
152      bounds <- which(diff(clines)!=1)      bounds <- which(diff(clines)!=1)
153      starts <- c(1,bounds+1)      starts <- c(1,bounds+1)
154      ends <- c(bounds,length(clines))      ends <- c(bounds,length(clines))
155      ## detect body of function using paren matching
156      code <- gsub("#.*","",src)
157      f <- function(ch)cumsum(nchar(gsub(sprintf("[^%s]",ch),"",code)))
158      parens <- f("(")-f(")")
159      body.begin <- which(diff(parens)<0 & parens[-1]==0)+2
160      if(length(body.begin)==0)body.begin <- 1 ## rare cases
161      is.arg <- function(){
162        gres <- grep("^\\s*#",src[start-1],perl=TRUE)
163        0 == length(gres) && start<=body.begin
164      }
165      res <- list()
166      for(i in seq_along(starts)){      for(i in seq_along(starts)){
167        start <- clines[starts[i]]        start <- clines[starts[i]]
168        end <- clines[ends[i]]        end <- clines[ends[i]]
169        lab <- if(end+1==length(code))"value"      lab <- if(all(grepl("^\\s*#",src[end:(length(src)-1)])))"value"
170        else if(start==2)"description"        else if(start==2)"description"
171        else if ( 0 == length(grep("^\\s*#",code[start-1],perl=TRUE)) ){      else if(is.arg()){
172           #arg <- gsub("^[ (]*","",code[start-1])        ##twutz: strip leading white spaces and brackets and ,
173           #arg <- gsub("^([^=,]*)[=,].*","\\1",arg)        arg <- gsub("^[ \t(,]*", "", src[start - 1])
          #arg <- gsub("...","\\dots",arg,fix=TRUE) ##special case for dots  
                  arg <- gsub("^[ \t(,]*", "", code[start - 1])  #twutz: strip leading white spaces and brackets and ,  
174                   arg <- gsub("^([^=,]*)[=,].*", "\\1", arg)                   arg <- gsub("^([^=,]*)[=,].*", "\\1", arg)
175                   arg <- gsub("^([^ \t]*)([ \t]+)$","\\1",arg)   #twutz: remove trailing whitespaces        ##twutz: remove trailing whitespaces
176          arg <- gsub("^([^ \t]*)([ \t]+)$","\\1",arg)
177                   arg <- gsub("...", "\\dots", arg, fix = TRUE)                   arg <- gsub("...", "\\dots", arg, fix = TRUE)
178           paste("item{",arg,"}",sep="")           paste("item{",arg,"}",sep="")
179         } else {         } else {
180           next;           next;
181         }         }
182        res[[lab]] <- decomment(code[start:end])      res[[lab]] <- decomment(src[start:end])
     }  
183    }    }
184      res
185    },ex=function(){
186    test <- function
187    ### the desc
188    (x,
189    ### the first argument
190     y ##<< another argument
191     ){
192      5
193    ### the return value
194    ##seealso<< foobar
195    }
196    src <- attr(test,"source")
197    prefixed.lines(src)
198    extract.xxx.chunks(src)
199    })
200    
201    extract.xxx.chunks <- function # Extract documentation from a function
202    ### Given source code of a function, return a list describing inline
203    ### documentation in that source code.
204    (src,
205    ### The source lines of the function to examine, as a character
206    ### vector.
207     name.fun="(unnamed function)",
208    ### The name of the function/chunk to use in warning messages.
209     ...
210    ### ignored.
211     ){
212      res <- list()
213    ##details<< For simple functions/arguments, the argument may also be    ##details<< For simple functions/arguments, the argument may also be
214    ## documented by appending \code{##<<} comments on the same line as the    ## documented by appending \code{##<<} comments on the same line as the
215    ## argument name. Mixing this mechanism with \code{###} comment lines for    ## argument name. Mixing this mechanism with \code{###} comment lines for
# Line 430  Line 288 
288            else paste(res[[field]], payload, sep=chunk.sep)            else paste(res[[field]], payload, sep=chunk.sep)
289        invisible(chunk.res)        invisible(chunk.res)
290      }      }
291    while ( k <= length(code) ){    while ( k <= length(src) ){
292      line <- code[k]      line <- src[k]
293      if ( 0 < length(grep(extra.regexp,line,perl=TRUE) ) ){      if ( 0 < length(grep(extra.regexp,line,perl=TRUE) ) ){
294        ## we have a new extra chunk - first get field name and any payload        ## we have a new extra chunk - first get field name and any payload
295        new.field <- gsub(extra.regexp,"\\1",line,perl=TRUE)        new.field <- gsub(extra.regexp,"\\1",line,perl=TRUE)
# Line 584  Line 442 
442  ### with the string in this list (implemented in modify.Rd.file).  ### with the string in this list (implemented in modify.Rd.file).
443  }  }
444    
445    ### Parsers for each function that are constructed automatically. This
446    ### is a named list, and each element is a parser function for an
447    ### individual object.
448    forfun.parsers <-
449      list(prefixed.lines=prefixed.lines,
450           examples.after.return=examples.after.return,
451           extract.xxx.chunks=extract.xxx.chunks,
452           ## title from first line of function def
453           title.from.firstline=function(src,name,code,...){
454             if(length(grep("#",src[1]))){
455               list(title=gsub("[^#]*#\\s*(.*)","\\1",src[1],perl=TRUE))
456             } else list()
457           },
458           ## PhG: it is tests/FUN.R!!! I would like more flexibility here
459           ## please, let me choose which dir to use for examples!
460           ## Get examples for FUN from the file tests/FUN.R
461           examples.from.testfile=function(name,...){
462             tsubdir <- getOption("inlinedocs.exdir")
463             if (is.null(tsubdir)) tsubdir <- "tests"       # Default value
464             tfile <- file.path("..",tsubdir,paste(name,".R",sep=""))
465             if(file.exists(tfile))
466               list(examples=readLines(tfile))
467             else list()
468           },
469           definition.from.source=function(doc,src,...){
470             def <- doc$definition
471             is.empty <- function(x)is.null(x)||x==""
472             if(is.empty(def) && !is.empty(src))
473               list(definition=src)
474             else list()
475           })
476    
477    ### List of Parser Functions that can be applied to any object.
478    forall.parsers <-
479      list(## Fill in author from DESCRIPTION and titles.
480           author.from.description=function(desc,...){
481             list(author=desc[,"Maintainer"])
482           },
483           ## The format section sometimes causes problems, so erase it.
484           erase.format=function(...){
485             list(format="")
486           },
487           ## Convert the function name to a title.
488           title.from.name=function(name,doc,...){
489             if("title"%in%names(doc))list() else
490             list(title=gsub("[._]"," ",name))
491           },
492           ## PhG: here is what I propose for examples code in the 'ex' attribute
493           examples.in.attr =  function (name, o, ...) {
494             ex <- attr(o, "ex")
495             if (!is.null(ex)) {
496               ## Special case for code contained in a function
497               if (inherits(ex, "function")) {
498                 ## If source is available, start from there
499                 src <- attr(ex, "source")
500                 if (!is.null(src)) {
501                   ex <- src
502                 } else { ## Use the body of the function
503                   ex <- deparse(body(ex))
504                 }
505                 ## Eliminate leading and trailing code
506                 ex <- ex[-c(1, length(ex))]
507                 ## all the prefixes
508                 ex <- kill.prefix.whitespace(ex)
509                 ## Add an empty line before and after example
510                 ex <- c("", ex, "")
511               }
512               list(examples = ex)
513             } else list()
514           },
515           collapse.docs=function(doc,...){
516             list(doc=lapply(doc,paste,collapse="\n"))
517           })
518    
519    ### List of parser functions that operate on single objects. This list
520    ### is useful for testing these functions.
521    lonely <- c(forall.parsers,forfun.parsers)
522    attr(lonely,"ex") <- function(){
523      f <- function # title
524    ### description
525      (x, ##<< arg x
526       y
527    ### arg y
528       ){
529        ##value<< a list with elements
530        list(x=x, ##<< original x value
531             y=y, ##<< original y value
532             sum=x+y) ##<< their sum
533        ##end<<
534      }
535      src <- attr(f,"source")
536      lonely$extract.xxx.chunks(src)
537      lonely$prefixed.lines(src)
538    }
539    
540    extra.code.docs <- function # Extract documentation from code chunks
541    ### Parse R code to extract inline documentation from comments around
542    ### each function. These are not able to be retreived simply by
543    ### looking at the "source" attribute. This is a Parser Function that
544    ### can be used in the parser list of package.skeleton.dx(). TODO:
545    ### Modularize this into separate Parsers Functions for S4 classes,
546    ### prefixes, ##<<blocks, etc. Right now it is not very clean!
547    (code,
548    ### Code lines in a character vector containing multiple R objects to
549    ### parse for documentation.
550     objs,
551    ### The objects defined in the code.
552     ...
553    ### ignored
554     ){
555      parsed <- extract.file.parse(code)
556      extract.docs.try <- function(o,on)
557        {
558          ## Note: we could use parsed information here too, but that
559          ## would produce different results for setMethodS3 etc.
560          doc <- list()
561          if ( !is.null(parsed[[on]]) ){
562            if ( !is.na(parsed[[on]]@code[1]) ){ # no code given for generics
563              doc$definition <- paste(parsed[[on]]@code)
564            }
565            if(!"description"%in%names(doc) && !is.na(parsed[[on]]@description) ){
566              doc$description <- parsed[[on]]@description
567            }
568            if ( "setMethodS3" == parsed[[on]]@created ){
569              # PhG: this may be wrong! It does not catch correctly how the method
570              # must be splitted in case of methods containing dots. for instance,
571              # as.data.frame.matrix must be split into: m1 = as.data.frame and
572              # m2 = matrix... here you got m1 = as, and m2 = data.frame.matrix!!!
573                      pattern <- "^([^\\.]+)\\.(.*)$"
574              doc$s3method=c(m1 <- gsub(pattern,"\\1",on,perl=TRUE),
575                  m2 <- gsub(pattern,"\\2",on,perl=TRUE))
576              if ( 0 < length(grep("\\W",m1,perl=TRUE)) ){
577                              m1 <- paste("`",m1,"`",sep="")
578              }
579              cat("S3method(",m1,",",m2,")\n",sep="")
580            }
581          }
582          if("title" %in% names(doc) && !"description" %in% names(doc) ){
583            ## For short functions having both would duplicate, but a
584            ## description is required. Therefore automatically copy title
585            ## across to avoid errors at package build time.
586            doc$description <- doc$title
587          }
588          doc
589        }
590      extract.docs <- function(on){
591        res <- try({o <- objs[[on]]
592                    extract.docs.try(o, on)},FALSE)
593        if(class(res)=="try-error"){
594          cat("Failed to extract docs for: ",on,"\n\n")
595          list()
596        } else if(0 == length(res) && inherits(objs[[on]],"standardGeneric")){
597          NULL
598        } else if(0 == length(res) && "function" %in% class(o)
599                  && 1 == length(osource <- attr(o,"source"))
600                  && 1 == length(grep(paste("UseMethod(",on,")",sep="\""),osource))
601                  ){
602          ## phew - this should only pick up R.oo S3 generic definitions like:
603          ## attr(*, "source")= chr "function(...) UseMethod(\"select\")"
604          NULL
605        } else res
606      }
607      doc.names <- names(objs)
608      res <- sapply(doc.names,extract.docs,simplify=FALSE)
609      ## Special processing for S4 classes as they do not appear in normal ls()
610      for ( nn in names(parsed) ){
611        if ( parsed[[nn]]@created == "setClass" ){
612          S4class.docs <- extract.docs.setClass(parsed[[nn]])
613          docname <- paste(nn,"class",sep="-")
614          if ( is.null(res[[docname]]) ){
615            res[[docname]] <- S4class.docs
616            doc.names <- c(doc.names,docname)
617          } else {
618            stop(nn," appears as both S4 class and some other definition")
619          }
620        }
621      }
622      inherit.docs <- function(on){
623        in.res <- res[[on]]
624        if ( !is.null(parsed[[on]]) ){
625          for ( parent in parsed[[on]]@parent ){
626            if ( !is.na(parent) ){
627              if ( is.null(in.res) ){
628                in.res <- res[[parent]]
629              } else if ( parent %in% names(res) ){
630                parent.docs <- res[[parent]]
631                for ( nn in names(parent.docs) ){
632                  if ( !nn %in% names(in.res) ){
633                    in.res[[nn]] <- parent.docs[[nn]]
634                  }
635                }
636              }
637            }
638          }
639        }
640        invisible(in.res)
641      }
642      all.done <- FALSE
643      while ( !all.done ){
644        res1 <- sapply(doc.names,inherit.docs,simplify=FALSE)
645        all.done <- identical(res1,res)
646        res <- res1
647      }
648      ## now strip out any generics (which have value NULL in res):
649      res.not.null <- sapply(res,function(x){!is.null(x)})
650      if ( 0 < length(res.not.null) && length(res.not.null) < length(res) ){
651        res <- res[res.not.null]
652      }
653      res
654    ### named list of lists, one for each object to document.
655    }
656    
657    ### List of parsers to use by default with package.skeleton.dx.
658    default.parsers <-
659      c(extra.code.docs=extra.code.docs, ## TODO: cleanup!
660        sapply(forfun.parsers,forfun),
661        edit.package.file=function(desc,...){
662          in.details <- setdiff(colnames(desc),"Description")
663          details <- sprintf("%s: \\tab %s\\cr",in.details,desc[,in.details])
664          L <-
665            list(list(title=desc[,"Title"],
666                      description=desc[,"Description"],
667                      `tabular{ll}`=details,
668                      author=desc[,"Maintainer"]))
669          names(L) <- paste(desc[,"Package"],"-package",sep="")
670          L
671        },
672        sapply(forall.parsers,forall)
673        )
674    
675  setClass("DocLink", # Link documentation among related functions  setClass("DocLink", # Link documentation among related functions
676  ### The \code{.DocLink} class provides the basis for hooking together  ### The \code{.DocLink} class provides the basis for hooking together
677  ### documentation of related classes/functions/objects. The aim is that  ### documentation of related classes/functions/objects. The aim is that
# Line 722  Line 810 
810    ## the same line or \code{### } comments at the beginning of the    ## the same line or \code{### } comments at the beginning of the
811    ## following line.    ## following line.
812    f.n <- paste(class.name,"class",sep="-")    f.n <- paste(class.name,"class",sep="-")
813    docs <- extract.docs.fun(chunk.source,f.n)    docs <- extract.xxx.chunks(chunk.source,f.n)
814      ## also apply source parsing functions that I separated out into
815      ## separate functions
816      docs <- combine(docs,lonely$prefixed.lines(chunk.source))
817      docs$title <- lonely$title.from.firstline(chunk.source)
818    ##details<<    ##details<<
819    ## The class definition skeleton includes an \code{Objects from the Class}    ## The class definition skeleton includes an \code{Objects from the Class}
820    ## section, to which any \code{##details<<} documentation chunks are    ## section, to which any \code{##details<<} documentation chunks are
# Line 763  Line 855 
855    old <- options(keep.source=TRUE)    old <- options(keep.source=TRUE)
856    on.exit(options(old))    on.exit(options(old))
857    exprs <- parse(text=code)    exprs <- parse(text=code)
858    for (i in exprs) eval(i, e)    for (i in exprs){
859        tryCatch(eval(i, e),error=function(e){
860          ##print(e)
861        })
862      }
863    objs <- sapply(ls(e),get,e,simplify=FALSE)    objs <- sapply(ls(e),get,e,simplify=FALSE)
864    
865    docs <- list()    docs <- list()
# Line 804  Line 900 
900  ### A list of extracted documentation from code.  ### A list of extracted documentation from code.
901  }  }
902    
903    ### Names of Parser Functions that operate on the desc arg.
904    descfile.names <- c("author.from.description","edit.package.file")
905    
906    ### Names of Parser Functions that do NOT use the desc arg.
907    non.descfile.names <-
908      names(default.parsers)[!names(default.parsers)%in%descfile.names]
909    
910  ### Parsers that operate only on R code, independently of the  ### Parsers that operate only on R code, independently of the
911  ### description file.  ### description file.
912  nondesc.parsers <- c(extra.code.docs=list(extra.code.docs),  nondesc.parsers <- default.parsers[non.descfile.names]
   default.parsers[c("parsefun","examples.after.return","examples.in.attr")])  
913    
914  extract.docs.file <- function  extract.docs.file <- function
915  ### Apply all parsers relevant to extract info from just 1 code file.  ### Apply all parsers relevant to extract info from just 1 code file.

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