java-pseudocode-compiler/TokenParser.java at master · rooftopsparrow/java-pseudocode-compiler · GitHub

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importjava.util.regex.*;
importjava.util.ArrayList;
importjava.util.Arrays;

publicclassTokenParser {

publicTokenTabletokenTable = newTokenTable();

// Return whether the string is a number
publicbooleanisNumber(Strings) {
returnPattern.matches("^\\d*\\.?\\d+$", s);
 }

// Return whether the string is a digit
publicbooleanisDigit(Strings) {
returnPattern.matches("^\\d$", s);
 }

// Return whether the String s is a decimal point
// for the given fragment
publicbooleanisDecimal(Stringfragment, Strings) {
return (s.equals(".") ? (fragment.replaceAll("[^\\.]", "").length() == 0) : false);
 }

// Return whether the String is a space
publicbooleanisSpace(Strings) {
returns.equals(" ");
 }

// Return whether the String is an End Of Line character
publicbooleanisEOL(Strings) {
returns.equals("\n");
 }

publicbooleanisStringCharacter(Strings) {
return (s.equals("'") || s.equals("\""));
 }

publicbooleanisSubString(Strings) {
return (s.indexOf('"') >= 0 || s.indexOf("'") >= 0);
 }

publicbooleanisDelimiter(Strings) {
return (this.isSpace(s) || this.isEOL(s) || tokenTable.isToken(s));
 }

publicbooleanisAssignment(Strings, Stringc) {
return (s.substring(s.length() - 1) + c).equals(":=");
 }

publicbooleanisLogical(Strings) {
// return false;
return (Pattern.matches("^>|>=|<>|=|<=|<$", s));
 }

publicTokentransform(Stringfragment) {

if (tokenTable.isToken(fragment))
returnnewToken(fragment, fragment, tokenTable.getCode(fragment));

if (this.isSpace(fragment))
returnnewToken(fragment, "SPACE", tokenTable.getCode("SPACE"));

if (this.isEOL(fragment))
returnnewToken(fragment, "EOL", tokenTable.getCode("EOL"));

if (this.isSubString(fragment))
returnnewToken(fragment, "STRING", tokenTable.getCode("STRING"));

if (this.isNumber(fragment))
returnnewToken(fragment, "NUMBER", tokenTable.getCode("NUMBER"));

returnnewToken(fragment, "IDENTIFIER", tokenTable.getCode("IDENTIFIER"));

 }

publicTokengetTokenObject(Stringstr) {

ArrayList<String> chars = newArrayList<String>(Arrays.asList(str.split("(?!^)")));
StringcurrentChar = "";
StringnextChar = "";
Stringfragment = "";

do {

currentChar = chars.remove(0);
fragment += currentChar;
nextChar = chars.isEmpty() ? "" : chars.get(0);

// Assignment opperator check
// ABC:= -> fragment ABC
if (this.isAssignment(fragment, nextChar)) {
if (fragment.equals(":")) fragment += nextChar;
elsefragment = fragment.substring(0, fragment.length() - 1);
 }

// String sub loop
if (this.isStringCharacter(fragment)) {
Stringstringpart;
do {
stringpart = chars.isEmpty() ? "" : chars.remove(0);
fragment += stringpart;
 } while (!this.isStringCharacter(stringpart) && !chars.isEmpty());
// TODO: THROW Exception for unbound strings
// if (!isStringCharacter(stringpart)) {
// throw new Exception("No end of string in data", str);
// }
break;
 }

// Number sub loop
if (this.isDigit(fragment)) {
Stringnumberpart = chars.isEmpty() ? "" : chars.remove(0);
while (this.isDigit(numberpart) || this.isDecimal(fragment, numberpart)) {
fragment += numberpart;
numberpart = chars.isEmpty() ? "" : chars.remove(0);
 }
// TODO: THROW Exception for bad number
//if (!this.isNumber(fragment)) {
// throw new Exception("Not a Number: " + fragment);
// }
break;
 }
// Logical opperator check <> >= <=
if ( this.isLogical(fragment) && this.isLogical(nextChar) ) fragment += nextChar;

 } while (!this.isDelimiter(fragment) && !this.isDelimiter(nextChar) && !chars.isEmpty());

returnthis.transform(fragment);

 }

}