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import java.util.HashMap;
import java.util.ArrayList;
import java.io.*;
/*
* @author
* Kian Agheli
*
* References:
* https://googlefonts.github.io/gf-guide/metadata.html
* https://stackoverflow.com/questions/3880274/how-to-convert-the-object-to-string-in-java
*
* Date:
* 2024-05-08
*
* Purpose of class:
* Read from and interpret JSON files.
*/
public class JSONReader extends Reader {
/* metadata.pb is not exactly JSON, but so close to it
that it's practically a subset of JSON with fewer quotation
marks. If set, this is a pb file. */
private boolean pb;
public JSONReader(File file) {
super(file);
pb = false;
}
private String composeKey(String key) {
if (!pb) {
key = "\"" + key + "\"";
}
key += ": ";
return key;
}
/**
* Search for and return the first
* match.
*/
public String get(String key) {
key = composeKey(key);
int start = this.getContents().indexOf(key);
if (start == -1) {
/* No match. */
return null;
}
start += key.length();
/* This JSON is pretty-printed. */
int nl = this.getContents().indexOf("\n", start);
/* Extract substring. Remove any quotation marks and commas. */
String substring = this.getContents().substring(start, nl);
return substring.replaceAll("[\",]", "");
}
/**
* Search for and return all matches.
*/
public String[] getAll(String key) {
key = composeKey(key);
ArrayList<String> list = new ArrayList<String>();
int lastMatch = 0;
while ((lastMatch = this.getContents().indexOf(key, lastMatch)) != -1) {
lastMatch += key.length();
int start = lastMatch;
/* This JSON is pretty-printed. */
int nl = this.getContents().indexOf("\n", start);
if (nl == -1) {
/* EOF. */
nl = this.getContents().length();
}
/* Extract substring. Remove any quotation marks and commas. */
String substring = this.getContents().substring(start, nl);
list.add(substring.replaceAll("[\",]", ""));
}
/* The caller doesn't need the capabilites of an ArrayList, only
those of an array. */
String[] array = new String[list.size()];
list.toArray(array);
return array;
}
/**
* Search for and return a table of fields.
*/
public String getTable(HashMap<String,String> name) {
return null;
}
/**
* Specify that this is the special PB format.
* See https://googlefonts.github.io/gf-guide/metadata.html. */
public void setPb() {
this.pb = true;
}
}
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