com.jayway.jsonpath.internal.CharacterIndex Maven / Gradle / Ivy
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Java port of Stefan Goessner JsonPath.
package com.jayway.jsonpath.internal;
import com.jayway.jsonpath.InvalidPathException;
public class CharacterIndex {
private static final char OPEN_PARENTHESIS = '(';
private static final char CLOSE_PARENTHESIS = ')';
private static final char CLOSE_SQUARE_BRACKET = ']';
private static final char SPACE = ' ';
private static final char ESCAPE = '\\';
private static final char SINGLE_QUOTE = '\'';
private static final char DOUBLE_QUOTE = '"';
private static final char MINUS = '-';
private static final char PERIOD = '.';
private static final char REGEX = '/';
//workaround for issue: https://github.com/json-path/JsonPath/issues/590
private static final char SCI_E = 'E';
private static final char SCI_e = 'e';
private final CharSequence charSequence;
private int position;
private int endPosition;
public CharacterIndex(CharSequence charSequence) {
this.charSequence = charSequence;
this.position = 0;
this.endPosition = charSequence.length() - 1;
}
public int length() {
return endPosition + 1;
}
public char charAt(int idx) {
return charSequence.charAt(idx);
}
public char currentChar() {
return charSequence.charAt(position);
}
public boolean currentCharIs(char c) {
return (charSequence.charAt(position) == c);
}
public boolean lastCharIs(char c) {
return charSequence.charAt(endPosition) == c;
}
public boolean nextCharIs(char c) {
return inBounds(position + 1) && (charSequence.charAt(position + 1) == c);
}
public int incrementPosition(int charCount) {
return setPosition(position + charCount);
}
public int decrementEndPosition(int charCount) {
return setEndPosition(endPosition - charCount);
}
public int setPosition(int newPosition) {
//position = min(newPosition, charSequence.length() - 1);
position = newPosition;
return position;
}
private int setEndPosition(int newPosition) {
endPosition = newPosition;
return endPosition;
}
public int position(){
return position;
}
public int indexOfClosingSquareBracket(int startPosition) {
int readPosition = startPosition;
while (inBounds(readPosition)) {
if(charAt(readPosition) == CLOSE_SQUARE_BRACKET){
return readPosition;
}
readPosition++;
}
return -1;
}
public int indexOfMatchingCloseChar(int startPosition, char openChar, char closeChar, boolean skipStrings, boolean skipRegex) {
if(charAt(startPosition) != openChar){
throw new InvalidPathException("Expected " + openChar + " but found " + charAt(startPosition));
}
int opened = 1;
int readPosition = startPosition + 1;
while (inBounds(readPosition)) {
if (skipStrings) {
char quoteChar = charAt(readPosition);
if (quoteChar == SINGLE_QUOTE || quoteChar == DOUBLE_QUOTE){
readPosition = nextIndexOfUnescaped(readPosition, quoteChar);
if(readPosition == -1){
throw new InvalidPathException("Could not find matching close quote for " + quoteChar + " when parsing : " + charSequence);
}
readPosition++;
}
}
if (skipRegex) {
if (charAt(readPosition) == REGEX) {
readPosition = nextIndexOfUnescaped(readPosition, REGEX);
if(readPosition == -1){
throw new InvalidPathException("Could not find matching close for " + REGEX + " when parsing regex in : " + charSequence);
}
readPosition++;
}
}
if (charAt(readPosition) == openChar) {
opened++;
}
if (charAt(readPosition) == closeChar) {
opened--;
if (opened == 0) {
return readPosition;
}
}
readPosition++;
}
return -1;
}
public int indexOfClosingBracket(int startPosition, boolean skipStrings, boolean skipRegex) {
return indexOfMatchingCloseChar(startPosition, OPEN_PARENTHESIS, CLOSE_PARENTHESIS, skipStrings, skipRegex);
}
public int indexOfNextSignificantChar(char c) {
return indexOfNextSignificantChar(position, c);
}
public int indexOfNextSignificantChar(int startPosition, char c) {
int readPosition = startPosition + 1;
while (!isOutOfBounds(readPosition) && charAt(readPosition) == SPACE) {
readPosition++;
}
if (charAt(readPosition) == c) {
return readPosition;
} else {
return -1;
}
}
public int nextIndexOf(char c) {
return nextIndexOf(position + 1, c);
}
public int nextIndexOf(int startPosition, char c) {
int readPosition = startPosition;
while (!isOutOfBounds(readPosition)) {
if (charAt(readPosition) == c) {
return readPosition;
}
readPosition++;
}
return -1;
}
public int nextIndexOfUnescaped(char c) {
return nextIndexOfUnescaped(position, c);
}
public int nextIndexOfUnescaped(int startPosition, char c) {
int readPosition = startPosition + 1;
boolean inEscape = false;
while (!isOutOfBounds(readPosition)) {
if(inEscape){
inEscape = false;
} else if('\\' == charAt(readPosition)){
inEscape = true;
} else if (c == charAt(readPosition)){
return readPosition;
}
readPosition ++;
}
return -1;
}
public char charAtOr(int postition, char defaultChar){
if(!inBounds(postition)) return defaultChar;
else return charAt(postition);
}
public boolean nextSignificantCharIs(int startPosition, char c) {
int readPosition = startPosition + 1;
while (!isOutOfBounds(readPosition) && charAt(readPosition) == SPACE) {
readPosition++;
}
return !isOutOfBounds(readPosition) && charAt(readPosition) == c;
}
public boolean nextSignificantCharIs(char c) {
return nextSignificantCharIs(position, c);
}
public char nextSignificantChar() {
return nextSignificantChar(position);
}
public char nextSignificantChar(int startPosition) {
int readPosition = startPosition + 1;
while (!isOutOfBounds(readPosition) && charAt(readPosition) == SPACE) {
readPosition++;
}
if (!isOutOfBounds(readPosition)) {
return charAt(readPosition);
} else {
return ' ';
}
}
public void readSignificantChar(char c) {
if (skipBlanks().currentChar() != c) {
throw new InvalidPathException(String.format("Expected character: %c", c));
}
incrementPosition(1);
}
public boolean hasSignificantSubSequence(CharSequence s) {
skipBlanks();
if (! inBounds(position + s.length() - 1)) {
return false;
}
if (! subSequence(position, position + s.length()).equals(s)) {
return false;
}
incrementPosition(s.length());
return true;
}
public int indexOfPreviousSignificantChar(int startPosition){
int readPosition = startPosition - 1;
while (!isOutOfBounds(readPosition) && charAt(readPosition) == SPACE) {
readPosition--;
}
if (!isOutOfBounds(readPosition)) {
return readPosition;
} else {
return -1;
}
}
public int indexOfPreviousSignificantChar(){
return indexOfPreviousSignificantChar(position);
}
public char previousSignificantChar(int startPosition) {
int previousSignificantCharIndex = indexOfPreviousSignificantChar(startPosition);
if(previousSignificantCharIndex == -1) return ' ';
else return charAt(previousSignificantCharIndex);
}
public char previousSignificantChar() {
return previousSignificantChar(position);
}
public boolean currentIsTail() {
return position >= endPosition;
}
public boolean hasMoreCharacters() {
return inBounds(position + 1);
}
public boolean inBounds(int idx) {
return (idx >= 0) && (idx <= endPosition);
}
public boolean inBounds() {
return inBounds(position);
}
public boolean isOutOfBounds(int idx) {
return !inBounds(idx);
}
public CharSequence subSequence(int start, int end) {
return charSequence.subSequence(start, end);
}
public CharSequence charSequence() {
return charSequence;
}
@Override
public String toString() {
return charSequence.toString();
}
public boolean isNumberCharacter(int readPosition) {
char c = charAt(readPosition);
//workaround for issue: https://github.com/json-path/JsonPath/issues/590
return Character.isDigit(c) || c == MINUS || c == PERIOD || c == SCI_E || c == SCI_e;
}
public CharacterIndex skipBlanks() {
while (inBounds() && position < endPosition && currentChar() == SPACE){
incrementPosition(1);
}
return this;
}
private CharacterIndex skipBlanksAtEnd() {
while (inBounds() && position < endPosition && lastCharIs(SPACE)){
decrementEndPosition(1);
}
return this;
}
public CharacterIndex trim() {
skipBlanks();
skipBlanksAtEnd();
return this;
}
}