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Project unfinished #45

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444fd83
add some logic and test
Ohiekkar Oct 17, 2016
d4e67e0
add stuff
Ohiekkar Oct 17, 2016
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184 changes: 179 additions & 5 deletions src/Spreadsheet.java
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Original file line number Diff line number Diff line change
@@ -1,18 +1,192 @@
import java.util.ArrayList;
import java.util.HashMap;

public class Spreadsheet {

private static final String error = "#Error";
private static final String circular = "#Circular";

private HashMap<String, String> spreadSheet = new HashMap<String, String>();
private ArrayList<String> nodes = new ArrayList<String>();

public String get(String cell) {
// to be implemented
return null;
String val = spreadSheet.get(cell);
if (val != null) {
if (isValidString(val)) {
val = stripStringTags(val);
}
else if (isFormula(val)) {
val = handleFormula(cell, val);
}
}
if (val != circular && nodes.contains(cell)) {
nodes.remove(cell);
}
return val;
}

private String handleFormula(String cell, String val) {
if (isValidCalculation(val.substring(1))) {
val = calculate(val.substring(1));
}
else if (isReference(val.substring(1))) {
if (!nodes.contains(cell)) {
nodes.add(cell);
}
else {
val = circular;
}
}
if (val != circular && !isValidInteger(val)) {
val = evaluate(val.substring(1));
}
return val;
}

private boolean isFormula(String val) {
if (val.startsWith("=")) {
return true;
}
return false;
}

private String stripStringTags(String val) {
val = val.replace("'", "");
val = val.replace("&", "");
return val;
}

public void set(String cell, String value) {
// to be implemented
if (isValidInteger(value) || isValidString(value) || isFormula(value) || isValidCalculation(value)) {
spreadSheet.put(cell, value);
}
else {
spreadSheet.put(cell, error);
}
}

private boolean isValidString(String value) {
if (value.startsWith("'") && value.endsWith("'")) {
return true;
}
return false;
}

private boolean isValidInteger(String value) {
try {
Integer.parseInt(value);
return true;
} catch (NumberFormatException e) {
return false;
}
}

public String evaluate(String cell) {
// to be implemented
return null;
String val = cell;
if (isValidString(val)) {
if (hasStringOperation(val)) {
val = performStringOperation(val);
}
else {
val = stripStringTags(val);
}
}
else if (isValidInteger(val)) {
// do nothing
}
else if (isReference(val)) {
val = this.get(val);
}
else {
return error;
}
return val;
}

private String performStringOperation(String val) {
String[] strings = val.split("&");
String word;
String phrase = "";
for (int i = 0; i < strings.length; i++) {
word = this.evaluate(strings[i]);
phrase = phrase.concat(word);
if (word == error) {
phrase = error;
break;
}
}
return phrase;
}

private boolean hasStringOperation(String val) {
if (val.indexOf("&") != -1) {
return true;
}
return false;
}

private String calculate(String cell) {
String operations = "+";
int result = 0;
int val;
char operation;
String[] values = cell.split("[-+*/%]");
operations += cell.replaceAll("\\w", "");
for (int i = 0; i < values.length; i++) {
operation = operations.charAt(i);
if (isValidInteger(values[i])) {
val = Integer.parseInt(values[i]);
}
else {
val = Integer.parseInt(this.get(values[i]));
}
result = performOperation(result, val, operation);
}
return Integer.toString(result);
}

private int performOperation(int result, int val, char operation) {
if (operation == '+') {
result += val;
}
else if (operation == '-') {
result -= val;
}
else if (operation == '*') {
result *= val;
}
else if (operation == '/') {
result /= val;
}
else if (operation == '%') {
result %= val;
}
return result;
}

private boolean isValidCalculation(String cell) {
String[] values = cell.split("[-+*/%]");
if (values.length > 1) {
for (int i = 0; i < values.length; i++) {
if (!isValidInteger(values[i]) && !isValidInteger(this.get(values[i]))) {
return false;
}
}
return true;
}
else {
return false;
}
}

private boolean isReference(String cell) {
if (isValidInteger(cell) || isValidString(cell)) {
return false;
}
if (Character.isLetter(cell.charAt(0)) && Character.isDigit(cell.charAt(1))) {
return true;
}
return false;
}

}
145 changes: 142 additions & 3 deletions tests/SpreadsheetTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -5,11 +5,150 @@


public class SpreadsheetTest {

Spreadsheet sheet = new Spreadsheet();

@Test
public void test() {
fail("Not yet implemented");

public void SpreadsheetTest_assign_get_val() {
sheet.set("A1", "-1");
String val = sheet.get("A1");
assertEquals("-1", val);
}

@Test
public void SpreadsheetTest_assign_get_wrong_format_int() {
sheet.set("A1", "5A");
String val = sheet.get("A1");
assertEquals("#Error", val);
}

@Test
public void SpreadsheetTest_assign_get_valid_string() {
sheet.set("A1", "'a string'");
String val = sheet.get("A1");
assertEquals("a string", val);
}

@Test
public void SpreadsheetTest_assign_get_invalid_string() {
sheet.set("A1", "'a string");
String val = sheet.get("A1");
assertEquals("#Error", val);
}

@Test
public void SpreadsheetTest_assign_formula_get_valid_string() {
sheet.set("A1", "='a string'");
String val = sheet.get("A1");
assertEquals("a string", val);
}

@Test
public void SpreadsheetTest_assign_formula_get_invalid_string() {
sheet.set("A1", "='a string");
String val = sheet.get("A1");
assertEquals("#Error", val);
}

@Test
public void SpreadsheetTest_assign_formula_get_valid_reference() {
sheet.set("A1", "='a string'");
sheet.set("A2", "=A1");
String val = sheet.get("A2");
assertEquals("a string", val);
}

@Test
public void SpreadsheetTest_assign_int_ref_get() {
sheet.set("A1", "5");
sheet.set("A2", "=A1");
String val = sheet.get("A2");
assertEquals("5", val);
}

@Test
public void SpreadsheetTest_assign_circular_reference_get() {
sheet.set("A1", "=A2");
sheet.set("A2", "=A1");
String val = sheet.get("A1");
assertEquals("#Circular", val);
}

@Test
public void SpreadsheetTest_invalid_calculation() {
sheet.set("A1", "10");
sheet.set("A2", "5");
sheet.set("A3", "asdf");
sheet.set("A4", "A1+A2+A3");
String val = sheet.get("A4");
assertEquals("#Error", val);
}

@Test
public void SpreadsheetTest_valid_sum_calculation() {
sheet.set("A1", "10");
sheet.set("A2", "5");
sheet.set("A3", "4");
sheet.set("A4", "=A1+A2+A3");
String val = sheet.get("A4");
assertEquals("19", val);
}

@Test
public void SpreadsheetTest_valid_sum_calculation_with_ref() {
sheet.set("A1", "10");
sheet.set("A2", "5");
sheet.set("A3", "=A1");
sheet.set("A4", "=A1+A2+A3");
String val = sheet.get("A4");
assertEquals("25", val);
}

@Test
public void SpreadsheetTest_ref_error() {
sheet.set("A5", "5A");
sheet.set("A1", "=A5");
String val = sheet.get("A1");
assertEquals("#Error", val);
}

@Test
public void SpreadsheetTest_valid_mul_calculation() {
sheet.set("A1", "1");
sheet.set("A2", "1");
sheet.set("A3", "3");
sheet.set("A4", "=A1+A2*A3");
String val = sheet.get("A4");
assertEquals("6", val);
}

@Test
public void SpreadsheetTest_calc_error() {
sheet.set("A1", "1+A1");
String val = sheet.get("A1");
assertEquals("#Error", val);
}

@Test
public void SpreadsheetTest_simple_calc() {
sheet.set("A1", "=1+2");
String val = sheet.get("A1");
assertEquals("3", val);
}

@Test
public void SpreadsheetTest_string_concat() {
sheet.set("A1", "='a'&'string'");
String val = sheet.get("A1");
assertEquals("astring", val);
}

@Test
public void SpreadsheetTest_string_concat_invalid() {
sheet.set("A1", "='a&'string'");
String val = sheet.get("A1");
assertEquals("#Error", val);
}


}