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May 31, 2016 07:02
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## R file for the analysis of references of Venice in the medium of poetry. | |
## This file was created as part of the SHS project "Venice in Poetry" | |
## of the course Digital Humanities taught by Prof. Frédéric Kaplan | |
## at EPFL in 2015-2016. | |
## | |
## Copyright (C) 2016 Marvin | |
## | |
## This program is free software; you can redistribute it and/or modify it | |
## under the terms of the GNU General Public License as published by | |
## the Free Software Foundation; either version 3 of the License, or | |
## (at your option) any later version. | |
## | |
## This program is distributed in the hope that it will be useful, | |
## but WITHOUT ANY WARRANTY; without even the implied warranty of | |
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
## GNU General Public License for more details. | |
## | |
## You should have received a copy of the GNU General Public License | |
## along with this program. If not, see <http://www.gnu.org/licenses/>. | |
## | |
## Author: Dario Marvin | |
## Created: 2016-04-28 | |
## ----------------- Load useful packages ------------------ | |
#install.packages("stringr") # if needed | |
library(stringr) | |
## ---------- Erase everything stored in memory ------------ | |
rm(list=ls()) | |
cat("\014") | |
options(warn=-1) | |
## ------------------- Useful functions -------------------- | |
readinteger <- function() { | |
n <- readline(prompt = "Enter your choice: ") | |
if(!grepl("^[0-9]+$",n) || n>2) { | |
return(readinteger()) | |
} | |
return(as.integer(n)) | |
} | |
read_y_n <- function() { | |
n <- readline(prompt = "Enter your choice: ") | |
if(n == "y" || n == 1) { | |
return(TRUE) | |
} else { | |
return(FALSE) | |
} | |
} | |
## ---------------------- Text choice ---------------------- | |
cat ("Please choose a poem:","\n","1: Commedia, by Dante Alighieri","\n", | |
"2: Orlando Furioso, by Ludovico Ariosto","\n","\n"); | |
choice <- readinteger() | |
if (choice == 1) { | |
text = scan("http://www.gutenberg.org/files/1012/1012-0.txt", what="character", sep="\n", encoding="UTF-8") | |
} else if (choice == 2) { | |
text = scan("http://www.gutenberg.org/files/3747/3747-0.txt", what="character", sep="\n", encoding="UTF-8") | |
} else | |
print("Error! Choose a possible value") | |
## --------------------- Text analisis --------------------- | |
if (choice == 1) { | |
poem.lines = text[19:14356] # clear metadata out of the text | |
} else if (choice == 2) { | |
poem.lines = text[19:43645] | |
} | |
poem.lines <- tolower(poem.lines) # change all letters to lowercase | |
poem.lines <- str_trim(poem.lines) # eliminate initial spaces in each line | |
poem.length <- length(poem.lines) | |
poem.words <- strsplit(poem.lines, "\\W") # list all words in the poem | |
poem.words <- unlist(poem.words) | |
not.blanks <- which(poem.words != "") # clear of all blank spaces | |
poem.words <- poem.words[not.blanks] | |
words.freqs <- table(poem.words) | |
sorted.words.freqs <- sort(words.freqs , decreasing=TRUE) | |
sorted.words.freqs[1:30] | |
keywords = c("venezia","venetiae","veneziani","viniziani","rïalto","rialto","san marco","vinegia","doge","mestre","venetia") | |
#keywords = c("ugolino"); | |
for (i in 1:length(keywords)) { | |
pos <- str_extract(poem.lines,keywords[i]) | |
pos <- which(!is.na(pos)) | |
count <- length(pos) | |
if (count == 0) { | |
cat("Found 0 references of the word",keywords[i],"\n") | |
} else { | |
if (count == 1) { | |
cat("Found 1 reference of the word",keywords[i],"\n","Do you want to visualize it? [y/n]") | |
} else { | |
cat("Found ",count," references of the word",keywords[i],"\n","Do you want to visualize them? [y/n]") | |
} | |
bool <- read_y_n() | |
cat("\n") | |
if (bool == TRUE) { | |
for (j in 1:length(pos)) { | |
if (choice == 1) { | |
tmp = max(5,pos[j]-200) | |
test1 <- grepl("canto",poem.lines[tmp:pos[j]]) | |
test2 <- (grepl("inferno",poem.lines[tmp:pos[j]]) | |
| grepl("purgatorio",poem.lines[tmp:pos[j]]) | |
| grepl("paradiso",poem.lines[tmp:pos[j]])) | |
test <- test1 & test2 | |
if (is.element(TRUE,test)) { | |
ref <- max(which(test == TRUE)) | |
} else { | |
ref <- 4 | |
} | |
diff <- ref | |
canto <- max(4,tmp - 1 + ref) | |
if (ref == 4) { | |
line <- pos[j]-4 | |
cat(poem.lines[ref],", ",line,":","\n\n",sep=""); | |
} else { | |
line <- 201 - diff | |
cat(poem.lines[canto],", ",line,":","\n\n",sep=""); | |
} | |
} else if (choice == 2) { | |
num <- as.numeric(poem.lines[(pos[j]-4):(pos[j]+4)]) | |
loc <- which(!is.na(num)) | |
num <- num[!is.na(num)] | |
if (loc > 5){ | |
num <- num - 1 | |
} | |
one <- as.numeric(poem.lines[(max(5,pos[j]-num*9-6)):(max(pos[j]-num*9+8,14))]) | |
loc2 <- which(one == 1) | |
canto <- max(4,pos[j]-num*9+loc2-8) | |
ottava <- num | |
if (loc == 1) { | |
line <- 4 | |
} else if (loc == 2) { | |
line <- 3 | |
} else if (loc == 3) { | |
line <- 2 | |
} else if (loc == 4) { | |
line <- 1 | |
}else if (loc == 6) { | |
line <- 8 | |
}else if (loc == 7) { | |
line <- 7 | |
}else if (loc == 8) { | |
line <- 6 | |
}else if (loc == 9) { | |
line <- 5 | |
} | |
cat(poem.lines[canto],", ",ottava,", ",line,":","\n\n",sep=""); | |
} | |
cat(poem.lines[(pos[j]-4):(pos[j]+4)], sep="\n") | |
cat("\n","--------------------------------------------","\n\n") | |
} | |
} | |
} | |
} | |
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