processing/app/src/processing/app/syntax/Brackets.java at master · hayscoding/processing · GitHub

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package processing.app.syntax;

import java.util.ArrayList;

import java.util.List;

/**

* @author Jonathan Feinberg <jdf@pobox.com>

public class Brackets {

private volatile List<Integer> offsets = null;

public void invalidate() {

offsets = null;

}

public int findMatchingBracket(final String text, final int pos) {

if (pos < 0 || pos >= text.length())

return -1;

final char alpha = text.charAt(pos);

final char beta;

final int direction;

switch (alpha) {

case '(':

beta = ')';

direction = 1;

break;

case ')':

beta = '(';

direction = -1;

break;

case '[':

beta = ']';

direction = 1;

break;

case ']':

beta = '[';

direction = -1;

break;

case '{':

beta = '}';

direction = 1;

break;

case '}':

beta = '{';

direction = -1;

break;

default:

return -1;

}

if (offsets == null)

parse(text);

// find this bracket

int p;

for (p = 0; p < offsets.size(); p++)

if (offsets.get(p) == pos)

break;

if (p == offsets.size()) {

return -1;

}

int depth = 1;

for (p += direction; p >= 0 && p < offsets.size(); p += direction) {

final int offset = offsets.get(p);

final char c = text.charAt(offset);

if (c == alpha)

depth++;

else if (c == beta)

depth--;

if (depth == 0)

return offset;

}

return -1;

}

int pos;

private void parse(final String text) {

offsets = new ArrayList<Integer>();

final int len = text.length();

for (pos = 0; pos < len; pos++) {

final char c = text.charAt(pos);

if (c == '/' && (pos < len - 1)) {

final char d = text.charAt(++pos);

if (d == '/') {

readComment(text);

} else if (d == '*') {

readMLComment(text);

} else pos--; // Go back because there isn't a comment.

} else if (c == '"' || c == '\'') {

readString(text, c);

} else if (c == '{' || c == '[' || c == '(' || c == '}' || c == ']'

|| c == ')') {

offsets.add(pos);

}

private void readString(final String text, final char q) {

final int len = text.length();

for (pos++; pos < len; pos++) {

final char c = text.charAt(pos);

if (c == q) {

return;

}

if (c == '\\') {

pos++;

}

private void readComment(final String text) {

final int len = text.length();

for (pos++; pos < len; pos++)

if (text.charAt(pos) == '\n') {

return;

}

private void readMLComment(final String text) {

final int len = text.length();

for (pos++; pos < len; pos++) {

final char c = text.charAt(pos);

if (c == '*' && (pos < len - 1)) {

final char d = text.charAt(pos + 1);

if (d == '/') {

pos++;

return;

}

processing/app/src/processing/app/syntax/Brackets.java at master · hayscoding/processing · GitHub

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