SCM

SCM Repository

[tm] Diff of /pkg/R/corpus.R
ViewVC logotype

Diff of /pkg/R/corpus.R

Parent Directory Parent Directory | Revision Log Revision Log | View Patch Patch

revision 1108, Fri Oct 22 18:32:47 2010 UTC revision 1409, Fri Feb 27 16:10:18 2015 UTC
# Line 1  Line 1 
1  # Author: Ingo Feinerer  # Author: Ingo Feinerer
2    
3  .PCorpus <- function(x, cmeta, dmeta, dbcontrol) {  PCorpus <-
4      attr(x, "CMetaData") <- cmeta  function(x,
5      attr(x, "DMetaData") <- dmeta           readerControl = list(reader = reader(x), language = "en"),
6      attr(x, "DBControl") <- dbcontrol           dbControl = list(dbName = "", dbType = "DB1"))
7      class(x) <- c("PCorpus", "Corpus", "list")  {
8      x      stopifnot(inherits(x, "Source"))
 }  
 DBControl <- function(x) attr(x, "DBControl")  
9    
10  PCorpus <- function(x,      readerControl <- prepareReader(readerControl, reader(x))
                     readerControl = list(reader = x$DefaultReader, language = "en"),  
                     dbControl = list(dbName = "", dbType = "DB1"),  
                     ...) {  
     readerControl <- prepareReader(readerControl, x$DefaultReader, ...)  
11    
12      if (!filehash::dbCreate(dbControl$dbName, dbControl$dbType))      if (!filehash::dbCreate(dbControl$dbName, dbControl$dbType))
13          stop("error in creating database")          stop("error in creating database")
14      db <- filehash::dbInit(dbControl$dbName, dbControl$dbType)      db <- filehash::dbInit(dbControl$dbName, dbControl$dbType)
15    
16      # Allocate memory in advance if length is known      x <- open(x)
17      tdl <- if (x$Length > 0)      tdl <- vector("list", length(x))
         vector("list", as.integer(x$Length))  
     else  
         list()  
   
18      counter <- 1      counter <- 1
19      while (!eoi(x)) {      while (!eoi(x)) {
20          x <- stepNext(x)          x <- stepNext(x)
21          elem <- getElem(x)          elem <- getElem(x)
22          doc <- readerControl$reader(elem, readerControl$language, if (is.null(x$Names)) as.character(counter) else x$Names[counter])          doc <- readerControl$reader(elem,
23          filehash::dbInsert(db, ID(doc), doc)                                      readerControl$language,
24          if (x$Length > 0) tdl[[counter]] <- ID(doc)                                      as.character(counter))
25          else tdl <- c(tdl, ID(doc))          filehash::dbInsert(db, meta(doc, "id"), doc)
26            tdl[[counter]] <- meta(doc, "id")
27          counter <- counter + 1          counter <- counter + 1
28      }      }
29      names(tdl) <- x$Names      x <- close(x)
30    
31      df <- data.frame(MetaID = rep(0, length(tdl)), stringsAsFactors = FALSE)      p <- list(content = tdl,
32      filehash::dbInsert(db, "DMetaData", df)                meta = CorpusMeta(),
33      dmeta.df <- data.frame(key = "DMetaData", subset = I(list(NA)))                dmeta = data.frame(row.names = seq_along(tdl)),
34                  dbcontrol = dbControl)
35      .PCorpus(tdl, .MetaDataNode(), dmeta.df, dbControl)      class(p) <- c("PCorpus", "Corpus")
36        p
37  }  }
38    
39  .VCorpus <- function(x, cmeta, dmeta) {  Corpus <-
40      attr(x, "CMetaData") <- cmeta  VCorpus <-
41      attr(x, "DMetaData") <- dmeta  function(x, readerControl = list(reader = reader(x), language = "en"))
42      class(x) <- c("VCorpus", "Corpus", "list")  {
43      x      stopifnot(inherits(x, "Source"))
 }  
44    
45  # Register S3 corpus classes to be recognized by S4 methods. This is      readerControl <- prepareReader(readerControl, reader(x))
 # mainly a fix to be compatible with packages which were originally  
 # developed to cooperate with corresponding S4 tm classes. Necessary  
 # since tm's class architecture was changed to S3 since tm version 0.5.  
 setOldClass(c("VCorpus", "Corpus", "list"))  
   
 # The "..." are additional arguments for the FunctionGenerator reader  
 VCorpus <- Corpus <- function(x,  
                               readerControl = list(reader = x$DefaultReader, language = "en"),  
                               ...) {  
     readerControl <- prepareReader(readerControl, x$DefaultReader, ...)  
   
     # Allocate memory in advance if length is known  
     tdl <- if (x$Length > 0)  
         vector("list", as.integer(x$Length))  
     else  
         list()  
46    
47      if (x$Vectorized)      x <- open(x)
48          tdl <- mapply(function(x, id) readerControl$reader(x, readerControl$language, id),      tdl <- vector("list", length(x))
49        # Check for parallel element access
50        if (is.function(getS3method("pGetElem", class(x), TRUE)))
51            tdl <- mapply(function(elem, id)
52                              readerControl$reader(elem, readerControl$language, id),
53                        pGetElem(x),                        pGetElem(x),
54                        id = if (is.null(x$Names)) as.character(seq_len(x$Length)) else x$Names,                        id = as.character(seq_along(x)),
55                        SIMPLIFY = FALSE)                        SIMPLIFY = FALSE)
56      else {      else {
57          counter <- 1          counter <- 1
58          while (!eoi(x)) {          while (!eoi(x)) {
59              x <- stepNext(x)              x <- stepNext(x)
60              elem <- getElem(x)              elem <- getElem(x)
61              doc <- readerControl$reader(elem, readerControl$language, if (is.null(x$Names)) as.character(counter) else x$Names[counter])              doc <- readerControl$reader(elem,
62              if (x$Length > 0)                                          readerControl$language,
63                                            as.character(counter))
64                  tdl[[counter]] <- doc                  tdl[[counter]] <- doc
             else  
                 tdl <- c(tdl, list(doc))  
65              counter <- counter + 1              counter <- counter + 1
66          }          }
67      }      }
68      names(tdl) <- x$Names      x <- close(x)
     df <- data.frame(MetaID = rep(0, length(tdl)), stringsAsFactors = FALSE)  
     .VCorpus(tdl, .MetaDataNode(), df)  
 }  
69    
70  `[.PCorpus` <- function(x, i) {      as.VCorpus(tdl)
     if (missing(i)) return(x)  
     index <- attr(x, "DMetaData")[[1 , "subset"]]  
     attr(x, "DMetaData")[[1 , "subset"]] <- if (is.numeric(index)) index[i] else i  
     dmeta <- attr(x, "DMetaData")  
     .PCorpus(NextMethod("["), CMetaData(x), dmeta, DBControl(x))  
71  }  }
72    
73  `[.VCorpus` <- function(x, i) {  `[.PCorpus` <-
74      if (missing(i)) return(x)  function(x, i)
75      .VCorpus(NextMethod("["), CMetaData(x), DMetaData(x)[i, , drop = FALSE])  {
76        if (!missing(i)) {
77            x$content <- x$content[i]
78            x$dmeta <- x$dmeta[i, , drop = FALSE]
79        }
80        x
81  }  }
82    
83  `[<-.PCorpus` <- function(x, i, value) {  `[.VCorpus` <-
84      db <- filehash::dbInit(DBControl(x)[["dbName"]], DBControl(x)[["dbType"]])  function(x, i)
85      counter <- 1  {
86      for (id in unclass(x)[i]) {      if (!missing(i)) {
87          if (identical(length(value), 1L)) db[[id]] <- value          x$content <- x$content[i]
88          else db[[id]] <- value[[counter]]          x$dmeta <- x$dmeta[i, , drop = FALSE]
89          counter <- counter + 1          if (!is.null(x$lazy))
90                x$lazy$index <- x$lazy$index[i]
91      }      }
92      x      x
93  }  }
94    
95  .map_name_index <- function(x, i) {  .map_name_index <-
96      if (is.character(i)) {  function(x, i)
97          if (is.null(names(x)))  {
98              match(i, meta(x, "ID", type = "local"))      if (is.character(i))
99            match(i, meta(x, "id", "local"))
100          else          else
             match(i, names(x))  
     }  
101      i      i
102  }  }
103    
104  `[[.PCorpus` <-  function(x, i) {  `[[.PCorpus` <-
105    function(x, i)
106    {
107      i <- .map_name_index(x, i)      i <- .map_name_index(x, i)
108      db <- filehash::dbInit(DBControl(x)[["dbName"]], DBControl(x)[["dbType"]])      db <- filehash::dbInit(x$dbcontrol[["dbName"]], x$dbcontrol[["dbType"]])
109      filehash::dbFetch(db, NextMethod("[["))      filehash::dbFetch(db, x$content[[i]])
110  }  }
111  `[[.VCorpus` <-  function(x, i) {  `[[.VCorpus` <-
112    function(x, i)
113    {
114      i <- .map_name_index(x, i)      i <- .map_name_index(x, i)
115      lazyTmMap <- meta(x, tag = "lazyTmMap", type = "corpus")      if (!is.null(x$lazy))
116      if (!is.null(lazyTmMap))          .Call(copyCorpus, x, materialize(x, i))
117          .Call("copyCorpus", x, materialize(x, i))      x$content[[i]]
     NextMethod("[[")  
118  }  }
119    
120  `[[<-.PCorpus` <-  function(x, i, value) {  `[[<-.PCorpus` <-
121    function(x, i, value)
122    {
123      i <- .map_name_index(x, i)      i <- .map_name_index(x, i)
124      db <- filehash::dbInit(DBControl(x)[["dbName"]], DBControl(x)[["dbType"]])      db <- filehash::dbInit(x$dbcontrol[["dbName"]], x$dbcontrol[["dbType"]])
125      index <- unclass(x)[[i]]      db[[x$content[[i]]]] <- value
     db[[index]] <- value  
126      x      x
127  }  }
128  `[[<-.VCorpus` <-  function(x, i, value) {  `[[<-.VCorpus` <-
129    function(x, i, value)
130    {
131      i <- .map_name_index(x, i)      i <- .map_name_index(x, i)
132      # Mark new objects as not active for lazy mapping      # Mark new objects as inactive for lazy mapping
133      lazyTmMap <- meta(x, tag = "lazyTmMap", type = "corpus")      if (!is.null(x$lazy))
134      if (!is.null(lazyTmMap)) {          x$lazy$index[i] <- FALSE
135          lazyTmMap$index[i] <- FALSE      x$content[[i]] <- value
         meta(x, tag = "lazyTmMap", type = "corpus") <- lazyTmMap  
     }  
     # Set the value  
     cl <- class(x)  
     y <- NextMethod("[[<-")  
     class(y) <- cl  
     y  
 }  
   
 # Update NodeIDs of a CMetaData tree  
 .update_id <- function(x, id = 0, mapping = NULL, left.mapping = NULL, level = 0) {  
     # Traversal of (binary) CMetaData tree with setup of NodeIDs  
     set_id <- function(x) {  
         x$NodeID <- id  
         id <<- id + 1  
         level <<- level + 1  
         if (length(x$Children) > 0) {  
             mapping <<- cbind(mapping, c(x$Children[[1]]$NodeID, id))  
             left <- set_id(x$Children[[1]])  
             if (level == 1) {  
                 left.mapping <<- mapping  
                 mapping <<- NULL  
             }  
             mapping <<- cbind(mapping, c(x$Children[[2]]$NodeID, id))  
             right <- set_id(x$Children[[2]])  
   
             x$Children <- list(left, right)  
         }  
         level <<- level - 1  
136          x          x
137      }      }
     list(root = set_id(x), left.mapping = left.mapping, right.mapping = mapping)  
 }  
   
 # Find indices to be updated for a CMetaData tree  
 .find_indices <- function(x) {  
     indices.mapping <- NULL  
     for (m in levels(as.factor(DMetaData(x)$MetaID))) {  
         indices <- (DMetaData(x)$MetaID == m)  
         indices.mapping <- c(indices.mapping, list(m = indices))  
         names(indices.mapping)[length(indices.mapping)] <- m  
     }  
     indices.mapping  
 }  
138    
139  c2 <- function(x, y, ...) {  as.list.PCorpus <- as.list.VCorpus <-
140      # Update the CMetaData tree  function(x, ...)
141      cmeta <- .MetaDataNode(0, list(merge_date = as.POSIXlt(Sys.time(), tz = "GMT"), merger = Sys.getenv("LOGNAME")), list(CMetaData(x), CMetaData(y)))      content(x)
142      update.struct <- .update_id(cmeta)  
143    as.VCorpus <-
144      new <- .VCorpus(c(unclass(x), unclass(y)), update.struct$root, NULL)  function(x)
145        UseMethod("as.VCorpus")
146      # Find indices to be updated for the left tree  as.VCorpus.VCorpus <- identity
147      indices.mapping <- .find_indices(x)  as.VCorpus.list <-
148    function(x)
149      # Update the DMetaData data frames for the left tree  {
150      for (i in 1:ncol(update.struct$left.mapping)) {      v <- list(content = x,
151          map <- update.struct$left.mapping[,i]                meta = CorpusMeta(),
152          DMetaData(x)$MetaID <- replace(DMetaData(x)$MetaID, indices.mapping[[as.character(map[1])]], map[2])                dmeta = data.frame(row.names = seq_along(x)))
153      }      class(v) <- c("VCorpus", "Corpus")
154        v
     # Find indices to be updated for the right tree  
     indices.mapping <- .find_indices(y)  
   
     # Update the DMetaData data frames for the right tree  
     for (i in 1:ncol(update.struct$right.mapping)) {  
         map <- update.struct$right.mapping[,i]  
         DMetaData(y)$MetaID <- replace(DMetaData(y)$MetaID, indices.mapping[[as.character(map[1])]], map[2])  
155      }      }
156    
157      # Merge the DMetaData data frames  outer_union <-
158      labels <- setdiff(names(DMetaData(y)), names(DMetaData(x)))  function(x, y, ...)
159      na.matrix <- matrix(NA, nrow = nrow(DMetaData(x)), ncol = length(labels), dimnames = list(row.names(DMetaData(x)), labels))  {
160      x.dmeta.aug <- cbind(DMetaData(x), na.matrix)      if (nrow(x) > 0L)
161      labels <- setdiff(names(DMetaData(x)), names(DMetaData(y)))          x[, setdiff(names(y), names(x))] <- NA
162      na.matrix <- matrix(NA, nrow = nrow(DMetaData(y)), ncol = length(labels), dimnames = list(row.names(DMetaData(y)), labels))      if (nrow(y) > 0L)
163      y.dmeta.aug <- cbind(DMetaData(y), na.matrix)          y[, setdiff(names(x), names(y))] <- NA
164      DMetaData(new) <- rbind(x.dmeta.aug, y.dmeta.aug)      res <- rbind(x, y)
165        if (ncol(res) == 0L)
166      new          res <- data.frame(row.names = seq_len(nrow(x) + nrow(y)))
167        res
168  }  }
169    
170  c.Corpus <-  c.VCorpus <-
171  function(x, ..., recursive = FALSE)  function(..., recursive = FALSE)
172  {  {
173      args <- list(...)      args <- list(...)
174        x <- args[[1L]]
175    
176      if (identical(length(args), 0L))      if (length(args) == 1L)
177          return(x)          return(x)
178    
179      if (!all(unlist(lapply(args, inherits, class(x)))))      if (!all(unlist(lapply(args, inherits, class(x)))))
180          stop("not all arguments are of the same corpus type")          stop("not all arguments are of the same corpus type")
181    
182      if (inherits(x, "PCorpus"))      v <- list(content = do.call("c", lapply(args, content)),
183          stop("concatenation of corpora with underlying databases is not supported")                meta = CorpusMeta(meta = do.call("c",
184                    lapply(args, function(a) meta(a, type = "corpus")))),
185      l <- base::c(list(x), args)                dmeta = Reduce(outer_union, lapply(args, meta)))
186      if (recursive)      class(v) <- c("VCorpus", "Corpus")
187          Reduce(c2, l)      v
     else {  
         l <- do.call("c", lapply(l, unclass))  
         .VCorpus(l,  
                  cmeta = .MetaDataNode(),  
                  dmeta = data.frame(MetaID = rep(0, length(l)), stringsAsFactors = FALSE))  
     }  
188  }  }
189    
190  c.TextDocument <- function(x, ..., recursive = FALSE) {  content.VCorpus <-
191      args <- list(...)  function(x)
192    {
193      if (identical(length(args), 0L))      if (!is.null(x$lazy))
194          return(x)          .Call(copyCorpus, x, materialize(x))
195        x$content
196      if (!all(unlist(lapply(args, inherits, class(x)))))  }
         stop("not all arguments are text documents")  
197    
198      dmeta <- data.frame(MetaID = rep(0, length(list(x, ...))), stringsAsFactors = FALSE)  content.PCorpus <-
199      .VCorpus(list(x, ...), .MetaDataNode(), dmeta)  function(x)
200    {
201        db <- filehash::dbInit(x$dbcontrol[["dbName"]], x$dbcontrol[["dbType"]])
202        filehash::dbMultiFetch(db, unlist(x$content))
203  }  }
204    
205  print.Corpus <- function(x, ...) {  inspect <-
206      cat(sprintf(ngettext(length(x),  function(x)
207                           "A corpus with %d text document\n",      UseMethod("inspect", x)
208                           "A corpus with %d text documents\n"),  inspect.PCorpus <- inspect.VCorpus <-
209                  length(x)))  function(x)
210    {
211        print(x)
212        cat("\n")
213        print(noquote(content(x)))
214      invisible(x)      invisible(x)
215  }  }
216    
217  summary.Corpus <- function(object, ...) {  length.PCorpus <- length.VCorpus <-
218      print(object)  function(x)
219      if (length(DMetaData(object)) > 0) {      length(x$content)
220          cat(sprintf(ngettext(length(attr(CMetaData(object), "MetaData")),  
221                               "\nThe metadata consists of %d tag-value pair and a data frame\n",  names.PCorpus <- names.VCorpus <-
222                               "\nThe metadata consists of %d tag-value pairs and a data frame\n"),  function(x)
223                      length(CMetaData(object)$MetaData)))      as.character(meta(x, "id", "local"))
         cat("Available tags are:\n")  
         cat(strwrap(paste(names(CMetaData(object)$MetaData), collapse = " "), indent = 2, exdent = 2), "\n")  
         cat("Available variables in the data frame are:\n")  
         cat(strwrap(paste(names(DMetaData(object)), collapse = " "), indent = 2, exdent = 2), "\n")  
     }  
 }  
224    
225  inspect <- function(x) UseMethod("inspect", x)  `names<-.PCorpus` <- `names<-.VCorpus` <-
226  inspect.PCorpus <- function(x) {  function(x, value)
227      summary(x)  {
228      cat("\n")      meta(x, "id", "local") <- as.character(value)
229      db <- filehash::dbInit(DBControl(x)[["dbName"]], DBControl(x)[["dbType"]])      x
     show(filehash::dbMultiFetch(db, unlist(x)))  
 }  
 inspect.VCorpus <- function(x) {  
     summary(x)  
     cat("\n")  
     print(noquote(lapply(x, identity)))  
230  }  }
231    
232  lapply.PCorpus <- function(X, FUN, ...) {  print.PCorpus <- print.VCorpus <-
233      db <- filehash::dbInit(DBControl(X)[["dbName"]], DBControl(X)[["dbType"]])  function(x, ...)
234      lapply(filehash::dbMultiFetch(db, unlist(X)), FUN, ...)  {
235  }      writeLines(sprintf("<<%s (documents: %d, metadata (corpus/indexed): %d/%d)>>",
236  lapply.VCorpus <- function(X, FUN, ...) {                         class(x)[1],
237      lazyTmMap <- meta(X, tag = "lazyTmMap", type = "corpus")                         length(x),
238      if (!is.null(lazyTmMap))                         length(meta(x, type = "corpus")),
239          .Call("copyCorpus", X, materialize(X))                         ncol(meta(x, type = "indexed"))))
240      base::lapply(X, FUN, ...)      invisible(x)
241  }  }
242    
243  writeCorpus <-  function(x, path = ".", filenames = NULL) {  writeCorpus <-
244    function(x, path = ".", filenames = NULL)
245    {
246      filenames <- file.path(path,      filenames <- file.path(path,
247                             if (is.null(filenames)) unlist(lapply(x, function(x) sprintf("%s.txt", ID(x))))        if (is.null(filenames))
248              sprintf("%s.txt", as.character(meta(x, "id", "local")))
249                             else filenames)                             else filenames)
250      i <- 1  
251      for (o in x) {      stopifnot(length(x) == length(filenames))
252          writeLines(as.PlainTextDocument(o), filenames[i])  
253          i <- i + 1      mapply(function(doc, f) writeLines(as.character(doc), f), x, filenames)
254      }  
255        invisible(x)
256  }  }

Legend:
Removed from v.1108  
changed lines
  Added in v.1409

root@r-forge.r-project.org
ViewVC Help
Powered by ViewVC 1.0.0  
Thanks to:
Vienna University of Economics and Business Powered By FusionForge