uni-ba-socialagenda/issuecomp-2-analysis-EXT.R

require(lubridate)
require(XML)
require(stringr)
require(foreach)
require(doParallel)

source("issuecomp-functions.R")
setwd("E:/max.mehl")


load(file = "tweets_untagged.RData")

# Create date range
date_start <- as.Date("2014-01-01")
date_end <- as.Date("2014-12-31")
drange <- as.integer(date_end - date_start)
drange <- date_start + days(0:drange)

# Import issues and prepare everything
# Will only be filled after the large categorisation loop
issues <- data.frame(date = drange)
issuelist <- readLines("issues-v2.xml")
issuelist <- str_replace_all(string = issuelist, pattern = ".*<!-- .+ -->", "")
issuelist <- xmlToList(issuelist)
issueheads <- names(issuelist)
issues[issueheads] <- 0
tweets$issue <- ""
tweets$tags <- ""


# MATCH TWEETS ------------------------------------------------------------

# Create folder where all results will be saved (saver for backup and import)
id_folder <- "matched-ids"
unlink(id_folder, recursive = TRUE)
dir.create(id_folder)

# Tag expansion for plural, genetiv etc
tagexpand <- c("", "s", "n", "en", "er", "e")

# Parameters for parallelisation
writeLines(c(""), "issuecomp-analysis.log")  
cl<-makeCluster(7)
registerDoParallel(cl)

# START CAT LOOP
foreach(d = 1:nrow(issues), .packages = c("stringr"), .combine=rbind) %dopar% {
  # Go through every day
  curdate <- issues$date[d]
  cat(paste(as.character(curdate),"\n"), file="issuecomp-analysis.log", append=TRUE)
  
  # Put all tweets from specific day in a temporary DF
  tweets_curday <- tweets[tweets[, "created_at"] == curdate, ]
  
  for(t in 1:nrow(tweets_curday)){
    #     cat(paste("Starting tweet", t, "of",as.character(curdate),"\n"), file="issuecomp-analysis.log", append=TRUE)
    # Select tweet's text, make it lowercase and remove hashtag indicators (#)
    curtext <- as.character(tweets_curday$text[t])
    curtext <- str_replace_all(curtext, "#", "")
    
    curid <- as.character(tweets_curday$id_str[t])
    
    # Now test each single issue (not tag!)
    for(i in 1:length(issueheads)) {
      curissue <- issueheads[i]
      curtags <- as.character(issuelist[[curissue]])  
      curfile <- str_c(id_folder,"/",curissue,".csv")
      
      # Now test all tags of a single issue
      for(s in 1:length(curtags)) {
        curtag <- curtags[s]
        curchars <- nchar(curtag, type = "chars")
        
        # Check if tag is an acronym. If so, ignore.case will be deactivated in smartPatternMatch
        curacro <- checkAcronym(string = curtag)
        # Check if tag is some kind of specific hashtag. If so, do not handle as acronym, but don't expand it either
        if(str_detect(curtag, "^#")) {
          curacro <- FALSE   # hashtags like #WM2014 are also written as #wm2014, so we need case-insensitivity
          curhash <- TRUE    # But we need to mark it as hashtag, so it doesn't get extended or Levenshtein distance > 0
          curtag <- str_replace(curtag, "#", "")
          curchars <- curchars - 1
        } else {
          curhash <- FALSE
        }
        
        # Now expand the current tag by possible suffixes that may be plural forms
        # Only do if it isn't an acronym or specific hastag
        if(!curacro && !curhash) {
          for(e in 1:length(tagexpand)) {
            curtag[e] <- str_c(curtag[1], tagexpand[e])
          }
        }
        
        # Set Levenshtein distance depending on char length, acronym and hashtag status
        if(curchars <= 6 || curacro || curhash) { # Distance = 1 if 7 chars or longer
          curdistance <- 0
        } else {
          curdistance <- 1
        }
        
        # Match current tweet with tag. 
        # Allow 1 Levenshtein distance if tag is >= 5 letters and no hashtag or acronym
        # Make is case-sensitiv if tag is an acronym
        
        tags_found <- NULL
        # Match the tweet with each variation of tagexpand
        for(e in 1:length(curtag)) {
          tags_found[e] <- smartPatternMatch(curtext, curtag[e], curdistance, curacro)
        }
        tags_found <- any(tags_found)
        curtag <- curtag[1]
        
        if(tags_found == TRUE) {
          #           # Raise number of findings on this day for this issue by 1
          #           issues[d,curissue] <- issues[d,curissue] + 1
          #           
          #           # Add issue and first matched tag of tweet to tweets-DF
          #           oldissue <- tweets[tweets[, "id_str"] == curid, "issue"]
          #           tweets[tweets[, "id_str"] == curid, "issue"] <- str_c(oldissue, curissue, ";")
          #           oldtag <- tweets[tweets[, "id_str"] == curid, "tags"]
          #           tweets[tweets[, "id_str"] == curid, "tags"] <- str_c(oldtag, curtag, ";")
          
          # Add information to file for function viewPatternMatching
          write(str_c(curdate,";\"",curid,"\";",curissue,";",curtag), curfile, append = TRUE)
          #           cat(paste("Match!\n"), file="issuecomp-analysis.log", append=TRUE)
          #           data.frame(date=curdate, issue=curissue)
          break   # next issue, no more tags from same issue
        }
        else {
          #cat("Nothing found\n")
        }
      } # /for curtags
    } # /for issuelist
  } # /for tweets_curday
} # /for drange

#rm(tweets_curday,curacro, curchars, curdate,curfile,curid,curissue,curtag,curtags,curtext,d,date_end,date_start,i,id_folder,oldissue,oldtag,s,t,tags_found)
stopCluster(cl)