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

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revision 142, Wed Oct 20 09:21:53 2010 UTC revision 335, Thu Apr 5 12:08:07 2012 UTC
# Line 1  Line 1 
1    do.not.generate <- function
2    ### Make a Parser Function used to indicate that certain Rd files
3    ### should not be generated.
4    (...
5    ### Character strings indicating Rd files without the .Rd suffix.
6     ){
7      filenames <- c(...)
8      function(docs,...){
9        for(fn in filenames){
10          docs[[fn]] <- list()
11        }
12        docs$.overwrite <- TRUE
13        docs
14      }
15    ### A Parser Function that will delete items from the outer
16    ### Documentation List.
17    }
18    
19  ### combine lists or character strings  ### combine lists or character strings
20  combine <- function(x,y)UseMethod("combine")  combine <- function(x,y)UseMethod("combine")
21    
# Line 7  Line 25 
25    
26  ### combine lists by adding elements or adding to existing elements  ### combine lists by adding elements or adding to existing elements
27  combine.list <- function(x,y){  combine.list <- function(x,y){
28    toadd <- !names(y)%in%names(x)    toadd <- if(".overwrite"%in%names(y)){
29    toup <- names(y)[names(y)%in%names(x)]      y <- y[names(y)!=".overwrite"]
30        rep(TRUE,length(y))
31      }else{
32        !names(y)%in%names(x)
33      }
34      toup <- names(y)[!toadd]
35    x[names(y)[toadd]] <- y[toadd]    x[names(y)[toadd]] <- y[toadd]
36    for(up in toup)x[[up]] <- combine(x[[up]],y[[up]])    for(up in toup)x[[up]] <- combine(x[[up]],y[[up]])
37    return(x)    x
38  ### A list, same type as x, but with added elements from y.  ### A list, same type as x, but with added elements from y.
39  }  }
40    
41    
42    getSource <- function
43    ### Extract a function's source code.
44    (fun.obj
45    ### A function.
46     ) {
47          srcref <- attr(fun.obj, "srcref")
48          if (!is.null(srcref)) {
49            ##unlist(strsplit(as.character(srcref), "\n"))
50            as.character(srcref)
51          }
52          else attr(fun.obj, "source")
53    ### Source code lines as a character vector.
54    }
55    
56  ### Prefix for code comments used with grep and gsub.  ### Prefix for code comments used with grep and gsub.
57  prefix <- "^[ \t]*###[ \t]"  prefix <- "^[ \t]*###[ \t]*"
58    
59  decomment <- function  decomment <- function
60  ### Remove comment prefix and join lines of code to form a  ### Remove comment prefix and join lines of code to form a
# Line 24  Line 62 
62  (comments  (comments
63  ### Character vector of prefixed comment lines.  ### Character vector of prefixed comment lines.
64   ){   ){
65    paste(gsub(prefix,"",comments),collapse="\n")    gsub(prefix,"",comments)
66  ### String without prefixes or newlines.  ### String without prefixes or newlines.
67  }  }
68    
 ### For each object in the package that satisfies the criterion#  
 ## checked by subfun, parse source using FUN and return the resulting  
 ### documentation list.  
69  forall <- function  forall <- function
70    ### For each object in the package that satisfies the criterion
71    ### checked by subfun, parse source using FUN and return the resulting
72    ### documentation list.
73  (FUN,  (FUN,
74  ### Function to apply to each element in the package.  ### Function to apply to each element in the package.
75   subfun=function(x)TRUE   subfun=function(x)TRUE
# Line 41  Line 79 
79   ){   ){
80    FUN <- FUN    FUN <- FUN
81    f <- function(objs,docs,...){    f <- function(objs,docs,...){
82        if(length(objs)==0)return(list())
83      objs <- objs[sapply(objs,subfun)]      objs <- objs[sapply(objs,subfun)]
84      L <- list()      L <- list()
85      for(N in names(docs)){      on.exit(cat(sprintf("Parser Function failed on %s\n",N)))
86        for(N in union(names(docs),names(objs))){
87        o <- objs[[N]]        o <- objs[[N]]
88        L[[N]] <- FUN(src=attr(o,"source"),        L[[N]] <- FUN(src=getSource(o),
89                      name=N,objs=objs,o=o,docs=docs,doc=docs[[N]],...)                      name=N,objs=objs,o=o,docs=docs,doc=docs[[N]],...)
90      }      }
91        on.exit()## remove warning message
92      L      L
93    }    }
94    class(f) <- c("allfun","function")    class(f) <- c("allfun","function")
# Line 67  Line 108 
108  ### For each function in the package, do something.  ### For each function in the package, do something.
109  forfun <- function(FUN)forall(FUN,is.function)  forfun <- function(FUN)forall(FUN,is.function)
110    
111  examples.after.return <- function  kill.prefix.whitespace <- function
112  ### Get examples from inline definitions after return()  ### Figure out what the whitespace preceding the example code is, and
113  ### PhG: this does not work well! Think of these situations:  ### then delete that from every line.
114  ### 1) You have multiple return() in the code of your function,  (ex
115  ### 2) You have return() appearing is some example code, ...  ### character vector of example code lines.
116  ### I can hardly propose a hack here. The whole code of the function   ){
117  ### must be parsed, and one must determine which one is the last line    tlines <- gsub("\\s*","",ex)
118  ### of code that is actually executed.    ##tlines <- gsub("#.*","",tlines)
119  ###    prefixes <- unique(gsub("\\S.*","",ex[tlines!=""]))
 ### 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!  
 (src,name="",...) {  
   ## Look for the examples mark  
   m <- grep("^\\s*(##examples<<|#\\{\\{\\{examples)", src)  
   if (!length(m)) return(list())  
   if (length(m) > 1)  
     warning("More than one examples tag for ", name,  
             ". Taking the last one")  
   m <- m[length(m)]  
   ## Look for the lines containing return value comments just before  
   r <- grep("\\s*### ", src[1:(m-1)])  
     if (!length(r)) {  
       value <- NULL  
     } else {  
       ## Only take consecutive lines before the mark  
       keep <- rev((m - rev(r)) == 1:length(r))  
       if (!any(keep)) {  
         value <- NULL  
       } else {  
         value <- decomment(src[r[keep]])  
       }  
     }  
   ## Collect now the example code beneath the mark  
   ex <- src[(m + 1):(length(src) - 1)]  
   ## Possibly eliminate a #}}} tag  
   ex <- ex[!grepl("#}}}", ex)]  
   ## Eliminate leading tabulations or four spaces  
   prefixes <- gsub("(\\s*).*","\\1",ex,perl=TRUE)[grep("\\w",ex)]  
120    FIND <- prefixes[which.min(nchar(prefixes))]    FIND <- prefixes[which.min(nchar(prefixes))]
121    ex <- sub(FIND,"",ex)    ## Eliminate leading tabulations or 2/4 spaces
122    ## Add an empty line before and after example    sub(FIND, "", ex)
123    ex <- c("", ex, "")  ### Character vector of code lines with preceding whitespace removed.
   ## Return examples and value  
   list(examples = paste(ex, collapse = "\n"), value = value)  
124  }  }
125    
126  prefixed.lines <- function(src,...){  prefixed.lines <- structure(function(src,...){
127  ### The primary mechanism of inline documentation is via consecutive  ### The primary mechanism of inline documentation is via consecutive
128  ### groups of lines matching the specified prefix regular expression  ### groups of lines matching the specified prefix regular expression
129  ### "\code{^### }" (i.e. lines beginning with "\code{### }") are  ### "\code{^### }" (i.e. lines beginning with "\code{### }") are
# Line 136  Line 139 
139    starts <- c(1,bounds+1)    starts <- c(1,bounds+1)
140    ends <- c(bounds,length(clines))    ends <- c(bounds,length(clines))
141    ## detect body of function using paren matching    ## detect body of function using paren matching
142    f <- function(ch)cumsum(nchar(gsub(sprintf("[^%s]",ch),"",src)))    code <- gsub("#.*","",src)
143      f <- function(ch)cumsum(nchar(gsub(sprintf("[^%s]",ch),"",code)))
144    parens <- f("(")-f(")")    parens <- f("(")-f(")")
145    body.begin <- which(diff(parens)<0 & parens[-1]==0)+2    body.begin <- which(diff(parens)<0 & parens[-1]==0)+2
146      if(length(body.begin)==0)body.begin <- 1 ## rare cases
147    is.arg <- function(){    is.arg <- function(){
148      0 == length(grep("^\\s*#",src[start-1],perl=TRUE)) &&      gres <- grep("^\\s*#",src[start-1],perl=TRUE)
149        start<=body.begin      0 == length(gres) && start<=body.begin
150      }      }
151    res <- list()    res <- list()
152    for(i in seq_along(starts)){    for(i in seq_along(starts)){
153      start <- clines[starts[i]]      start <- clines[starts[i]]
154      end <- clines[ends[i]]      end <- clines[ends[i]]
155      lab <- if(end+1==length(src))"value"      processed <- gsub("#.*","",gsub("[ }]","",src[(end+1):length(src)]))
156        lab <- if(all(processed==""))"value"
157      else if(start==2)"description"      else if(start==2)"description"
158      else if(is.arg()){      else if(is.arg()){
159        ##twutz: strip leading white spaces and brackets and ,        ##twutz: strip leading white spaces and brackets and ,
# Line 163  Line 169 
169      res[[lab]] <- decomment(src[start:end])      res[[lab]] <- decomment(src[start:end])
170    }    }
171    res    res
172  }  },ex=function(){
173    test <- function
174  ### Parsers for each object/function that are constructed  ### the description
175  ### automatically. This is a named list, each element is a list of 2  (x,
176  ### elements: forfun/forall, then a parser function for an individual  ### the first argument
177  ### object.   y ##<< another argument
 forfun.parsers <-  
   list(prefixed.lines=prefixed.lines,  
        examples.after.return=examples.after.return,  
        ## Extract lots of info from normal functions.  
        parsefun=function(src,name,...){  
          extract.docs.fun(src,name)  
        },  
        ## title from first line of function def  
        title.from.firstline=function(src,name,code,...){  
          if(length(grep("#",src[1]))){  
            list(title=gsub("[^#]*#\\s*(.*)","\\1",src[1],perl=TRUE))  
          } else list()  
        },  
        ## PhG: it is tests/FUN.R!!! I would like more flexibility here  
        ## please, let me choose which dir to use for examples!  
        ## Get examples for FUN from the file tests/FUN.R  
        examples.from.testfile=function(name,...){  
          tsubdir <- getOption("inlinedocs.exdir")  
          if (is.null(tsubdir)) tsubdir <- "tests"       # Default value  
          tfile <- file.path("..",tsubdir,paste(name,".R",sep=""))  
          if(file.exists(tfile))  
            list(examples=paste(readLines(tfile),collapse="\n"))  
          else list()  
        },  
        definition.from.source=function(doc,src,...){  
          def <- doc$definition  
          if(is.null(def)||def=="")  
            list(definition=paste(src,collapse="\n"))  
          else list()  
        })  
   
 ### List of Parser Functions that can be applied to any object.  
 forall.parsers <-  
   list(## Fill in author from DESCRIPTION and titles.  
        author.from.description=function(desc,...){  
          list(author=desc[,"Maintainer"])  
        },  
        ## The format section sometimes causes problems, so erase it.  
        erase.format=function(...){  
          list(format="")  
        },  
        ## Convert the function name to a title.  
        title.from.name=function(name,doc,...){  
          if("title"%in%names(doc))list() else  
          list(title=gsub("[._]"," ",name))  
        },  
        ## PhG: here is what I propose for examples code in the 'ex' attribute  
        examples.in.attr =  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 2/4 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 <- c(forall.parsers,forfun.parsers)  
 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  
178   ){   ){
179    parsed <- extract.file.parse(code)    5
180    extract.docs.try <- function(o,on)  ### the return value
181      {  ##seealso<< foobar
182        ## Note: we could use parsed information here too, but that  }
183        ## would produce different results for setMethodS3 etc.  src <- getSource(test)
184        doc <- list()  prefixed.lines(src)
185        if ( !is.null(parsed[[on]]) ){  extract.xxx.chunks(src)
         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.  
 }  
   
 ### List of parsers to use by default with package.skeleton.dx.  
 default.parsers <-  
   c(extra.code.docs=extra.code.docs, ## TODO: cleanup!  
     sapply(forfun.parsers,forfun),  
     sapply(forall.parsers,forall),  
     edit.package.file=function(desc,...){  
       in.details <- setdiff(colnames(desc),"Description")  
       details <- paste(paste(in.details,": \\tab ",desc[,in.details],"\\cr",  
                              sep=""),collapse="\n")  
       L <-  
         list(list(title=desc[,"Title"],  
                   description=desc[,"Description"],  
                   `tabular{ll}`=details,  
                   author=desc[,"Maintainer"]))  
       names(L) <- paste(desc[,"Package"],"-package",sep="")  
       L  
186      })      })
187    
188  extract.docs.fun <- function # Extract documentation from a function  extract.xxx.chunks <- function # Extract documentation from a function
189  ### Given source code of a function, return a list describing inline  ### Given source code of a function, return a list describing inline
190  ### documentation in that source code.  ### documentation in that source code.
191  (code,  (src,
192  ### The function to examine.  ### The source lines of the function to examine, as a character
193   name.fun  ### vector.
194     name.fun="(unnamed function)",
195  ### The name of the function/chunk to use in warning messages.  ### The name of the function/chunk to use in warning messages.
196     ...
197    ### ignored.
198   ){   ){
199    res <- list()    res <- list()
200    ##details<< For simple functions/arguments, the argument may also be    ##details<< For simple functions/arguments, the argument may also be
# Line 462  Line 269 
269          chunk.sep <- "\n\n"          chunk.sep <- "\n\n"
270        }        }
271        chunk.res <- NULL        chunk.res <- NULL
272        if ( 0 == length(grep("^\\s*$",payload,perl=TRUE)) )        if ( !grepl("^\\s*$",payload,perl=TRUE) )
273          chunk.res <-          chunk.res <-
274            if ( is.null(res[[field]]) ) payload            if ( is.null(res[[field]]) ) payload
275            else paste(res[[field]], payload, sep=chunk.sep)            else paste(res[[field]], payload, sep=chunk.sep)
276        invisible(chunk.res)        invisible(chunk.res)
277      }      }
278    while ( k <= length(code) ){    while ( k <= length(src) ){
279      line <- code[k]      line <- src[k]
280      if ( 0 < length(grep(extra.regexp,line,perl=TRUE) ) ){      ##print(line)
281        ##if(grepl("^$",line))browser()
282        if ( grepl(extra.regexp,line,perl=TRUE) ){
283        ## 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
284        new.field <- gsub(extra.regexp,"\\1",line,perl=TRUE)        new.field <- gsub(extra.regexp,"\\1",line,perl=TRUE)
285        new.contents <- gsub(extra.regexp,"\\2",line,perl=TRUE)        new.contents <- gsub(extra.regexp,"\\2",line,perl=TRUE)
286          ##cat(new.field,"\n-----\n",new.contents,"\n\n")
287        ##details<< As a special case, the construct \code{##describe<<} causes        ##details<< As a special case, the construct \code{##describe<<} causes
288        ## similar processing to the main function arguments to be        ## similar processing to the main function arguments to be
289        ## applied in order to construct a describe block within the        ## applied in order to construct a describe block within the
# Line 483  Line 292 
292        ## block until terminated by a subsequent \code{##}\emph{xxx}\code{<<} line.        ## block until terminated by a subsequent \code{##}\emph{xxx}\code{<<} line.
293        if ( "describe" == new.field ){        if ( "describe" == new.field ){
294          ##details<< Such regions may be nested, but not in such a way          ##details<< Such regions may be nested, but not in such a way
295          ## that the first element in a \code{describe} is another \code{describe}.          ## that the first element in a \code{describe} is another
296          ## Thus there must be at least one \code{##<<} comment between each          ## \code{describe}.  Thus there must be at least one
297          ## pair of \code{##describe<<} comments.          ## \code{##<<} comment between each pair of
298            ## \code{##describe<<} comments.
299          if ( first.describe ){          if ( first.describe ){
300            stop("consecutive ##describe<< at line",k,"in",name.fun)            stop("consecutive ##describe<< at line",k,"in",name.fun)
301          } else {          } else {
# Line 545  Line 355 
355            first.describe <- TRUE;            first.describe <- TRUE;
356          }          }
357        }        }
358      } else if ( in.chunk && 0<length(grep(cont.re,line,perl=TRUE)) ){      } else if ( in.chunk && grepl(cont.re,line,perl=TRUE) ){
359        ## append this line to current chunk        ## append this line to current chunk
360        if ( 0 == length(grep(prefix,line,perl=TRUE)) ){        if ( !grepl(prefix,line,perl=TRUE) ){
361          ##describe<< Any lines with "\code{### }" at the left hand          ##describe<< Any lines with "\code{### }" at the left hand
362          ## margin within the included chunks are handled separately,          ## margin within the included chunks are handled separately,
363          ## so if they appear in the documentation they will appear          ## so if they appear in the documentation they will appear
# Line 560  Line 370 
370            payload <- stripped            payload <- stripped
371          }          }
372        }        }
373      } else if ( 0 < length(grep(arg.pat,line,perl=TRUE)) ){      } else if ( grepl(arg.pat,line,perl=TRUE) ){
374        not.describe <- (0==in.describe && !first.describe)        not.describe <- (0==in.describe && !first.describe)
375        if ( in.chunk && not.describe){        if ( in.chunk && not.describe){
376          res[[cur.field]] <- end.chunk(cur.field,payload)          res[[cur.field]] <- end.chunk(cur.field,payload)
# Line 622  Line 432 
432  ### with the string in this list (implemented in modify.Rd.file).  ### with the string in this list (implemented in modify.Rd.file).
433  }  }
434    
435    leadingS3generic <- function # check whether function name is an S3 generic
436    ### Determines whether a function name looks like an S3 generic function
437    (name,                     ##<< name of function
438     env,                      ##<< environment to search for additional generics
439     ...)                      ##<< ignored here
440    {
441      ##details<< This function is one of the default parsers, but exposed as
442      ## possibly of more general interest. Given a function name of the form
443      ## x.y.z it looks for the generic function x applying to objects of class
444      ## y.z and also for generic function x.y applying to objects of class z.
445      ##
446      parts <- strsplit(name, ".", fixed = TRUE)[[1]]
447      l <- length(parts)
448      if (l > 1) {
449        for (i in 1:(l - 1)) {
450          ## Look for a generic function (known by the system or defined
451          ## in the package) that matches that part of the function name
452          generic <- paste(parts[1:i], collapse = ".")
453          if (any(generic %in% utils:::getKnownS3generics()) ||
454              utils:::findGeneric(generic, env) != "") {
455            object <- paste(parts[(i + 1):l], collapse = ".")
456            ##details<< Assumes that the first name which matches any known
457            ## generics is the target generic function, so if both x and x.y
458            ## are generic functions, will assume generic x applying to objects
459            ## of class y.z
460            ##value<< If a matching generic found returns a list with a single component:
461            return(list(.s3method=c(generic, object))) ##<< a character vector containing generic name and object name.
462          }
463        }
464      }
465      ##value<< If no matching generic functions are found, returns an empty list.
466      list()
467    }
468    
469    ### Parsers for each function that are constructed automatically. This
470    ### is a named list, and each element is a parser function for an
471    ### individual object.
472    forfun.parsers <-
473      list(prefixed.lines=prefixed.lines,
474           extract.xxx.chunks=extract.xxx.chunks,
475           ## title from first line of function def
476           title.from.firstline=function(src,...){
477             first <- src[1]
478             if(!is.character(first))return(list())
479             if(!grepl("#",first))return(list())
480             list(title=gsub("[^#]*#\\s*(.*)","\\1",first,perl=TRUE))
481           },
482           ## PhG: it is tests/FUN.R!!! I would like more flexibility here
483           ## please, let me choose which dir to use for examples!
484           ## Get examples for FUN from the file tests/FUN.R
485           examples.from.testfile=function(name,...){
486             tsubdir <- getOption("inlinedocs.exdir")
487             if (is.null(tsubdir)) tsubdir <- "tests"       # Default value
488             tfile <- file.path("..",tsubdir,paste(name,".R",sep=""))
489             if(file.exists(tfile))
490               list(examples=readLines(tfile))
491             else list()
492           },
493           definition.from.source=function(doc,src,...){
494             def <- doc$definition
495             is.empty <- function(x)is.null(x)||x==""
496             if(is.empty(def) && !is.empty(src))
497               list(definition=src)
498             else list()
499           })
500    
501    ### List of Parser Functions that can be applied to any object.
502    forall.parsers <-
503      list(## Fill in author from DESCRIPTION and titles.
504           author.from.description=function(desc,...){
505             list(author=desc[,"Author"])
506           },
507           ## The format section sometimes causes problems, so erase it.
508           erase.format=function(...){
509             list(format="")
510           },
511           ## Convert the function name to a title.
512           title.from.name=function(name,doc,...){
513             if("title"%in%names(doc))list() else
514             list(title=gsub("[._]"," ",name))
515           },
516           ## PhG: here is what I propose for examples code in the 'ex' attribute
517           examples.in.attr =  function (name, o, ...) {
518             ex <- attr(o, "ex")
519             if (!is.null(ex)) {
520               ## Special case for code contained in a function
521               if (inherits(ex, "function")) {
522                 ## If source is available, start from there
523                 src <- getSource(ex)
524                 if (!is.null(src)) {
525                   ex <- src
526                 } else { ## Use the body of the function
527                   ex <- deparse(body(ex))
528                 }
529                 ## Eliminate leading and trailing code
530                 ex <- ex[-c(1, length(ex))]
531                 if(ex[1]=="{")ex <- ex[-1]
532                 ## all the prefixes
533                 ex <- kill.prefix.whitespace(ex)
534                 ## Add an empty line before and after example
535                 ex <- c("", ex, "")
536               }
537               list(examples = ex)
538             } else list()
539           },collapse=function(doc,...){
540             L <- lapply(doc,paste,collapse="\n")
541             L$.overwrite <- TRUE
542             L
543           },tag.s3methods=leadingS3generic
544           )
545    
546    ### List of parser functions that operate on single objects. This list
547    ### is useful for testing these functions.
548    lonely <- structure(c(forall.parsers,forfun.parsers),ex=function(){
549      f <- function # title
550    ### description
551      (x, ##<< arg x
552       y
553    ### arg y
554       ){
555        ##value<< a list with elements
556        list(x=x, ##<< original x value
557             y=y, ##<< original y value
558             sum=x+y) ##<< their sum
559        ##end<<
560      }
561      src <- getSource(f)
562      lonely$extract.xxx.chunks(src)
563      lonely$prefixed.lines(src)
564    })
565    
566    extra.code.docs <- function # Extract documentation from code chunks
567    ### Parse R code to extract inline documentation from comments around
568    ### each function. These are not able to be retreived simply by
569    ### looking at the "source" attribute. This is a Parser Function that
570    ### can be used in the parser list of package.skeleton.dx(). TODO:
571    ### Modularize this into separate Parsers Functions for S4 classes,
572    ### prefixes, ##<<blocks, etc. Right now it is not very clean!
573    (code,
574    ### Code lines in a character vector containing multiple R objects to
575    ### parse for documentation.
576     objs,
577    ### The objects defined in the code.
578     ...
579    ### ignored
580     ){
581      parsed <- extract.file.parse(code)
582      extract.docs.try <- function(o,on)
583        {
584          ## Note: we could use parsed information here too, but that
585          ## would produce different results for setMethodS3 etc.
586          doc <- list()
587          if ( !is.null(parsed[[on]]) ){
588            if ( !is.na(parsed[[on]]@code[1]) ){ # no code given for generics
589              doc$definition <- paste(parsed[[on]]@code)
590            }
591            if(!"description"%in%names(doc) && !is.na(parsed[[on]]@description) ){
592              doc$description <- parsed[[on]]@description
593            }
594            ## if ( "setMethodS3" == parsed[[on]]@created ){
595            ##   gen <- leadingS3generic(on,topenv())
596            ##   if ( 0 < length(gen) ){
597            ##     doc$.s3method <- gen$.s3method
598            ##     cat("S3method(",gen$.s3method[1],",",gen$.s3method[2],")\n",sep="")
599            ##   }
600            ## }
601          }
602          if("title" %in% names(doc) && !"description" %in% names(doc) ){
603            ## For short functions having both would duplicate, but a
604            ## description is required. Therefore automatically copy title
605            ## across to avoid errors at package build time.
606            doc$description <- doc$title
607          }
608          doc
609        }
610      extract.docs <- function(on){
611        res <- try({o <- objs[[on]]
612                    extract.docs.try(o, on)},FALSE)
613        if(class(res)=="try-error"){
614          cat("Failed to extract docs for: ",on,"\n\n")
615          list()
616        } else if(0 == length(res) && inherits(objs[[on]],"standardGeneric")){
617          NULL
618        } else if(0 == length(res) && "function" %in% class(o)
619                  && 1 == length(osource <- getSource(o))
620                  && grepl(paste("UseMethod(",on,")",sep="\""),osource)
621                  ){
622          ## phew - this should only pick up R.oo S3 generic definitions like:
623          ## attr(*, "source")= chr "function(...) UseMethod(\"select\")"
624          NULL
625        } else res
626      }
627      doc.names <- names(objs)
628      res <- sapply(doc.names,extract.docs,simplify=FALSE)
629      ## Special processing for S4 classes as they do not appear in normal ls()
630      for ( nn in names(parsed) ){
631        if ( parsed[[nn]]@created == "setClass" ){
632          S4class.docs <- extract.docs.setClass(parsed[[nn]])
633          docname <- paste(nn,"class",sep="-")
634          if ( is.null(res[[docname]]) ){
635            res[[docname]] <- S4class.docs
636            doc.names <- c(doc.names,docname)
637          } else {
638            stop(nn," appears as both S4 class and some other definition")
639          }
640        }
641      }
642      inherit.docs <- function(on){
643        in.res <- res[[on]]
644        if ( !is.null(parsed[[on]]) ){
645          for ( parent in parsed[[on]]@parent ){
646            if ( !is.na(parent) ){
647              if ( is.null(in.res) ){
648                in.res <- res[[parent]]
649              } else if ( parent %in% names(res) ){
650                parent.docs <- res[[parent]]
651                for ( nn in names(parent.docs) ){
652                  if ( !nn %in% names(in.res) ){
653                    in.res[[nn]] <- parent.docs[[nn]]
654                  }
655                }
656              }
657            }
658          }
659        }
660        invisible(in.res)
661      }
662      all.done <- FALSE
663      while ( !all.done ){
664        res1 <- sapply(doc.names,inherit.docs,simplify=FALSE)
665        all.done <- identical(res1,res)
666        res <- res1
667      }
668      ## now strip out any generics (which have value NULL in res):
669      res.not.null <- sapply(res,function(x){!is.null(x)})
670      if ( 0 < length(res.not.null) && length(res.not.null) < length(res) ){
671        res <- res[res.not.null]
672      }
673      res
674    ### named list of lists, one for each object to document.
675    }
676    
677    ### List of parsers to use by default with package.skeleton.dx.
678    default.parsers <-
679      c(extra.code.docs=extra.code.docs, ## TODO: cleanup!
680        sapply(forfun.parsers,forfun),
681        edit.package.file=function(desc,...){
682          in.details <- setdiff(colnames(desc),"Description")
683          details <- sprintf("%s: \\tab %s\\cr",in.details,desc[,in.details])
684          L <-
685            list(list(title=desc[,"Title"],
686                      description=desc[,"Description"],
687                      `tabular{ll}`=details))
688          names(L) <- paste(desc[,"Package"],"-package",sep="")
689          L
690        },
691        sapply(forall.parsers,forall)
692        )
693    
694  setClass("DocLink", # Link documentation among related functions  setClass("DocLink", # Link documentation among related functions
695  ### The \code{.DocLink} class provides the basis for hooking together  ### The \code{.DocLink} class provides the basis for hooking together
696  ### documentation of related classes/functions/objects. The aim is that  ### documentation of related classes/functions/objects. The aim is that
697  ### documentation sections missing from the child are  ### documentation sections missing from the child are inherited from
698    ### the parent class.
699           representation(name="character", ##<< name of object           representation(name="character", ##<< name of object
700                          created="character", ##<< how created                          created="character", ##<< how created
701                          parent="character", ##<< parent class or NA                          parent="character", ##<< parent class or NA
# Line 660  Line 730 
730      ## "prefix" lines will be used instead.      ## "prefix" lines will be used instead.
731      default.description <- NULL      default.description <- NULL
732      while ( start > last.end+1      while ( start > last.end+1
733             && 1 == length(grep(prefix,code[start-1],perl=TRUE)) ){             && grepl(prefix,code[start-1],perl=TRUE) ){
734        start <- start-1        start <- start-1
735      }      }
736      if ( start < chunks[[k]][1] ){      if ( start < chunks[[k]][1] ){
# Line 687  Line 757 
757        ## If the function definition is not embedded within the call, then        ## If the function definition is not embedded within the call, then
758        ## the parent is that function. Test whether the the third value        ## the parent is that function. Test whether the the third value
759        ## looks like a name and add it to parents if so.        ## looks like a name and add it to parents if so.
760        if ( 1 == length(grep("^[\\._\\w]+$",chars[3],perl=TRUE)) ){        if ( grepl("^[\\._\\w]+$",chars[3],perl=TRUE) ){
761          parent <- chars[3]          parent <- chars[3]
762        }        }
763        res[[object.name]] <- new("DocLink",name=object.name,        res[[object.name]] <- new("DocLink",name=object.name,
# Line 719  Line 789 
789        ## If the function definition is not embedded within the call, then        ## If the function definition is not embedded within the call, then
790        ## the parent is that function. Test whether the the fourth value        ## the parent is that function. Test whether the the fourth value
791        ## looks like a name and add it to parents if so.        ## looks like a name and add it to parents if so.
792        if ( 1 == length(grep("^[\\._\\w]+$",chars[4],perl=TRUE)) ){        if ( grepl("^[\\._\\w]+$",chars[4],perl=TRUE) ){
793          parent <- c(chars[4],parent)          parent <- c(chars[4],parent)
794        }        }
795        res[[object.name]] <- new("DocLink",name=object.name,        res[[object.name]] <- new("DocLink",name=object.name,
# Line 760  Line 830 
830    ## the same line or \code{### } comments at the beginning of the    ## the same line or \code{### } comments at the beginning of the
831    ## following line.    ## following line.
832    f.n <- paste(class.name,"class",sep="-")    f.n <- paste(class.name,"class",sep="-")
833    docs <- extract.docs.fun(chunk.source,f.n)    docs <- extract.xxx.chunks(chunk.source,f.n)
834    ## also apply source parsing functions that I separated out into    ## also apply source parsing functions that I separated out into
835    ## separate functions    ## separate functions
836    docs <- combine(docs,lonely$prefixed.lines(chunk.source))    docs <- combine(docs,lonely$prefixed.lines(chunk.source))
837    docs$title <- lonely$title.from.firstline(chunk.source)    docs$title <- lonely$title.from.firstline(chunk.source)
838    ##details<<    ##details<<
839      ## If there is no explicit title on the first line of setClass, then
840      ## one is made up from the class name.
841      if ( 0 == length(docs$title) ){
842        docs$title <- list(title=paste(class.name,"S4 class"))
843      }
844      ##details<<
845    ## The class definition skeleton includes an \code{Objects from the Class}    ## The class definition skeleton includes an \code{Objects from the Class}
846    ## section, to which any \code{##details<<} documentation chunks are    ## section, to which any \code{##details<<} documentation chunks are
847    ## written. It is given a vanilla content if there are no specific    ## written. It is given a vanilla content if there are no specific
# Line 802  Line 878 
878  ### Additional arguments to pass to Parser Functions.  ### Additional arguments to pass to Parser Functions.
879   ){   ){
880    e <- new.env()    e <- new.env()
881    old <- options(keep.source=TRUE)    ## KMP 2011-03-09 fix problem with DocLink when inlinedocs ran on itself
882      ## Error in assignClassDef(Class, classDef, where) :
883      ##   Class "DocLink" has a locked definition in package "inlinedocs"
884      ## Traced to "where" argument in setClassDef which defaults to topenv()
885      ## which in turn is inlinedocs when processing inlinedocs package, hence
886      ## the clash. The following works (under R 2.12.2), so that the topenv()
887      ## now finds e before finding the inlinedocs environment.
888      old <- options(keep.source=TRUE,topLevelEnvironment=e)
889    on.exit(options(old))    on.exit(options(old))
890    exprs <- parse(text=code)    exprs <- parse(text=code)
891    for (i in exprs) eval(i, e)    ## TDH 2011-04-07 set this so that no warnings about creating a fake
892      ## package when we try to process S4 classes defined in code
893      e$.packageName <- "inlinedocs.processor"
894      for (i in exprs){
895          eval(i, e)
896      }
897    objs <- sapply(ls(e),get,e,simplify=FALSE)    objs <- sapply(ls(e),get,e,simplify=FALSE)
898    
899    docs <- list()    docs <- list()
900    
   # PhG: Automatically determine who is S3 methods  
   for (name in names(objs)) {  
     parts <- strsplit(name, ".", fixed = TRUE)[[1]]  
         l <- length(parts)  
         if (l > 1) {  
         for (i in 1:(l - 1)) {  
             # Look for a generic function (known by the system or defined  
             # in the package) that matches that part of the function name  
             generic <- paste(parts[1:i], collapse = ".")  
             if (any(generic %in% utils:::getKnownS3generics()) ||  
                 utils:::findGeneric(generic, e) != "") {  
                 object <- paste(parts[(i + 1):l], collapse = ".")  
                 docs[[name]]$s3method <- c(generic, object)  
                 break  
             }  
         }  
     }  
   }  
901    ## apply parsers in sequence to code and objs    ## apply parsers in sequence to code and objs
902      if(verbose)cat("Applying parsers:\n")
903    for(i in seq_along(parsers)){    for(i in seq_along(parsers)){
904      N <- names(parsers[i])      N <- names(parsers[i])
905      if(verbose){      if(verbose){
906        if(is.character(N) && N!=""){        if(is.character(N) && N!=""){
907          cat(N," ",sep="")          cat(N,"\n",sep="")
908        }else cat('. ')        }else cat('.\n')
909      }      }
910      p <- parsers[[i]]      p <- parsers[[i]]
911      ## This is the argument list that each parser receives:      ## This is the argument list that each parser receives:
912      L <- p(code=code,objs=objs,docs=docs,...)      L <- p(code=code,objs=objs,docs=docs,env=e,...)
913        #print(paste(L,"\n"))
914        #if(N=="exclude")browser()
915      docs <- combine(docs,L)      docs <- combine(docs,L)
916    }    }
917      ## post-process to collapse all character vectors
918      for(i in seq_along(docs)){
919        for(j in seq_along(docs[[i]])){
920          if(names(docs[[i]])[j]!=".s3method")
921          docs[[i]][[j]] <- paste(docs[[i]][[j]],collapse="\n")
922        }
923     }
924    if(verbose)cat("\n")    if(verbose)cat("\n")
925    docs    return(docs)
926  ### A list of extracted documentation from code.  ### A list of extracted documentation from code.
927  }  }
928    
# Line 857  Line 937 
937  ### description file.  ### description file.
938  nondesc.parsers <- default.parsers[non.descfile.names]  nondesc.parsers <- default.parsers[non.descfile.names]
939    
940  extract.docs.file <- function  extract.docs.file <- structure(function
941  ### Apply all parsers relevant to extract info from just 1 code file.  ### Apply all parsers relevant to extract info from just 1 code file.
942  (f,  (f,
943  ### File name of R code to read and parse.  ### File name of R code to read and parse.
944   parsers=nondesc.parsers,   parsers=NULL,
945  ### Parser Functions to use to parse the code and extract  ### Parser Functions to use to parse the code and extract
946  ### documentation.  ### documentation.
947   ...   ...
948  ### Other arguments to pass to Parser Functions.  ### Other arguments to pass to Parser Functions.
949   ){   ){
950      if(is.null(parsers))parsers <- nondesc.parsers
951    apply.parsers(readLines(f),parsers,verbose=FALSE,...)    apply.parsers(readLines(f),parsers,verbose=FALSE,...)
952  }  },ex=function(){
953      f <- system.file("silly","R","silly.R",package="inlinedocs")
954      extract.docs.file(f)
955    })
956    

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