panda.doc.markdown.Line Maven / Gradle / Ivy
package panda.doc.markdown;
import panda.doc.html.HTML;
import java.util.LinkedList;
/**
* This class represents a text line.
*
* It also provides methods for processing and analyzing a line.
*
*/
class Line {
/** Current cursor position. */
public int pos;
/** Leading and trailing spaces. */
public int leading = 0, trailing = 0;
/** Is this line empty? */
public boolean isEmpty = true;
/** This line's value. */
public String value = null;
/** Previous and next line. */
public Line previous = null, next = null;
/** Is previous/next line empty? */
public boolean prevEmpty, nextEmpty;
/** Final line of a XML block. */
public Line xmlEndLine;
/** Constructor. */
public Line() {
//
}
/**
* Calculates leading and trailing spaces. Also sets empty if needed.
*/
public void init() {
this.leading = 0;
while (this.leading < this.value.length() && this.value.charAt(this.leading) == ' ')
this.leading++;
if (this.leading == this.value.length()) {
this.setEmpty();
}
else {
this.isEmpty = false;
this.trailing = 0;
while (this.value.charAt(this.value.length() - this.trailing - 1) == ' ')
this.trailing++;
}
}
/**
* Recalculate leading spaces.
*/
public void initLeading() {
this.leading = 0;
while (this.leading < this.value.length() && this.value.charAt(this.leading) == ' ')
this.leading++;
if (this.leading == this.value.length()) {
this.setEmpty();
}
}
/**
* Skips spaces.
*
* @return false if end of line is reached
*/
public boolean skipSpaces() {
while (this.pos < this.value.length() && this.value.charAt(this.pos) == ' ') {
this.pos++;
}
return this.pos < this.value.length();
}
/**
* Reads chars from this line until any 'end' char is reached.
*
* @param end Delimiting character(s)
* @return The read String or null if no 'end' char was reached.
*/
public String readUntil(char... end) {
final StringBuilder sb = new StringBuilder();
int pos = this.pos;
while (pos < this.value.length()) {
final char ch = this.value.charAt(pos);
if (ch == '\\' && pos + 1 < this.value.length()) {
final char c;
switch (c = this.value.charAt(pos + 1)) {
case '\\':
case '[':
case ']':
case '(':
case ')':
case '{':
case '}':
case '#':
case '"':
case '\'':
case '.':
case '>':
case '*':
case '+':
case '-':
case '_':
case '!':
case '`':
sb.append(c);
pos++;
break;
default:
sb.append(ch);
break;
}
}
else {
boolean endReached = false;
for (int n = 0; n < end.length; n++) {
if (ch == end[n]) {
endReached = true;
break;
}
}
if (endReached)
break;
sb.append(ch);
}
pos++;
}
final char ch = pos < this.value.length() ? this.value.charAt(pos) : '\n';
for (int n = 0; n < end.length; n++) {
if (ch == end[n]) {
this.pos = pos;
return sb.toString();
}
}
return null;
}
/**
* Marks this line empty. Also sets previous/next line's empty attributes.
*/
public void setEmpty() {
this.value = "";
this.leading = this.trailing = 0;
this.isEmpty = true;
if (this.previous != null)
this.previous.nextEmpty = true;
if (this.next != null)
this.next.prevEmpty = true;
}
/**
* Counts the amount of 'ch' in this line.
*
* @param ch The char to count.
* @param min the minimum count
* @return A value > 0 if this line only consists of 'ch' end spaces.
*/
public boolean isAllChars(char ch, int min) {
if (this.value.length() < min) {
return false;
}
int count = 0;
for (int i = 0; i < this.value.length(); i++) {
final char c = this.value.charAt(i);
if (c == ' ') {
continue;
}
if (c == ch) {
count++;
continue;
}
return false;
}
return count >= min;
}
/**
* Gets this line's type.
*
* @param extendedMode Whether extended profile is enabled or not
* @return The LineType.
*/
public LineType getLineType(boolean extendedMode) {
if (this.isEmpty)
return LineType.EMPTY;
if (this.leading > 3)
return LineType.CODE;
char lc = this.value.charAt(this.leading);
if (lc == '#')
return LineType.HEADLINE;
if (lc == '>')
return LineType.BQUOTE;
if (extendedMode) {
if (this.value.length() - this.leading - this.trailing > 2) {
if (this.value.startsWith("```"))
return LineType.FENCED_CODE;
if (this.value.startsWith("~~~"))
return LineType.FENCED_CODE;
if (this.value.startsWith("^^^"))
return LineType.TABLEB;
if (this.value.startsWith("%%%"))
return LineType.PLUGIN;
}
}
if (this.value.length() - this.leading - this.trailing > 2
&& (lc == '*' || lc == '-' || this.value
.charAt(this.leading) == '_')) {
if (this.isAllChars(lc, 3))
return LineType.HR;
}
if (this.value.length() - this.leading >= 2 && this.value.charAt(this.leading + 1) == ' ') {
switch (lc) {
case '*':
case '-':
case '+':
return LineType.ULIST;
}
}
if (this.value.length() - this.leading >= 3 && Character.isDigit(lc)) {
int i = this.leading + 1;
while (i < this.value.length() && Character.isDigit(this.value.charAt(i)))
i++;
if (i + 1 < this.value.length() && this.value.charAt(i) == '.' && this.value.charAt(i + 1) == ' ')
return LineType.OLIST;
}
if (lc == '<') {
if (this.checkHTML())
return LineType.XML;
}
if (this.next != null && !this.next.isEmpty) {
if ((this.next.value.charAt(0) == '-') && this.next.isAllChars('-', 2))
return LineType.HEADLINE2;
if ((this.next.value.charAt(0) == '=') && this.next.isAllChars('=', 2))
return LineType.HEADLINE1;
if (extendedMode
&& this.next.next != null && !this.next.next.isEmpty
&& this.isTableLine(this, false)
&& this.isTableLine(this.next, true)
&& this.isTableLine(this.next.next, false)) {
return LineType.TABLE;
}
}
return LineType.OTHER;
}
private boolean isTableLine(Line line, boolean sep) {
if (line.leading > 3) {
return false;
}
int l = line.value.length();
int s = line.leading;
while (s < l && line.value.charAt(s) == '|') {
s++;
}
while (s < l && line.value.charAt(s) == ' ') {
s++;
}
int e = l - line.trailing - 1;
while (e >= 0 && line.value.charAt(e) == '|') {
e--;
}
while (e >= 0 && line.value.charAt(e) == ' ') {
e--;
}
if (e - s < 3) {
return false;
}
if (sep && line.value.charAt(s) != '-' && line.value.charAt(s) != ':') {
return false;
}
int p = line.value.indexOf('|', s);
return (p > s && p < e);
}
/**
* Reads an XML comment. Sets xmlEndLine.
*
* @param firstLine The Line to start reading from.
* @param start The starting position.
* @return The new position or -1 if it is no valid comment.
*/
private int readXMLComment(final Line firstLine, final int start) {
Line line = firstLine;
if (start + 3 < line.value.length()) {
if (line.value.charAt(2) == '-' && line.value.charAt(3) == '-') {
int pos = start + 4;
while (line != null) {
while (pos < line.value.length() && line.value.charAt(pos) != '-') {
pos++;
}
if (pos == line.value.length()) {
line = line.next;
pos = 0;
}
else {
if (pos + 2 < line.value.length()) {
if (line.value.charAt(pos + 1) == '-' && line.value.charAt(pos + 2) == '>') {
this.xmlEndLine = line;
return pos + 3;
}
}
pos++;
}
}
}
}
return -1;
}
/**
* Checks if this line contains an ID at it's end and removes it from the line.
*
* @return The ID or null if no valid ID exists.
*/
// FIXME ... hack
public String stripID() {
if (this.isEmpty || this.value.charAt(this.value.length() - this.trailing - 1) != '}')
return null;
int p = this.leading;
boolean found = false;
while (p < this.value.length() && !found) {
switch (this.value.charAt(p)) {
case '\\':
if (p + 1 < this.value.length()) {
switch (this.value.charAt(p + 1)) {
case '{':
p++;
break;
}
}
p++;
break;
case '{':
found = true;
break;
default:
p++;
break;
}
}
if (found) {
if (p + 1 < this.value.length() && this.value.charAt(p + 1) == '#') {
final int start = p + 2;
p = start;
found = false;
while (p < this.value.length() && !found) {
switch (this.value.charAt(p)) {
case '\\':
if (p + 1 < this.value.length()) {
switch (this.value.charAt(p + 1)) {
case '}':
p++;
break;
}
}
p++;
break;
case '}':
found = true;
break;
default:
p++;
break;
}
}
if (found) {
final String id = this.value.substring(start, p).trim();
if (this.leading != 0) {
this.value = this.value.substring(0, this.leading)
+ this.value.substring(this.leading, start - 2).trim();
}
else {
this.value = this.value.substring(this.leading, start - 2).trim();
}
this.trailing = 0;
return id.length() > 0 ? id : null;
}
}
}
return null;
}
/**
* Checks for a valid HTML block. Sets xmlEndLine.
*
* @return true if it is a valid block.
*/
private boolean checkHTML() {
final LinkedList tags = new LinkedList();
final StringBuilder temp = new StringBuilder();
int pos = this.leading;
if (this.value.charAt(this.leading + 1) == '!') {
if (this.readXMLComment(this, this.leading) > 0)
return true;
}
pos = Utils.readXML(temp, this.value, this.leading, false);
String element, tag;
if (pos > -1) {
element = temp.toString();
temp.setLength(0);
Utils.getXMLTag(temp, element);
tag = temp.toString().toLowerCase();
if (!HTML.isBlockElement(tag))
return false;
if (tag.equals("hr")) {
this.xmlEndLine = this;
return true;
}
tags.add(tag);
Line line = this;
while (line != null) {
while (pos < line.value.length() && line.value.charAt(pos) != '<') {
pos++;
}
if (pos >= line.value.length()) {
line = line.next;
pos = 0;
}
else {
temp.setLength(0);
final int newPos = Utils.readXML(temp, line.value, pos, false);
if (newPos > 0) {
element = temp.toString();
temp.setLength(0);
Utils.getXMLTag(temp, element);
tag = temp.toString().toLowerCase();
if (HTML.isBlockElement(tag) && !tag.equals("hr")) {
if (element.charAt(1) == '/') {
if (!tags.getLast().equals(tag))
return false;
tags.removeLast();
}
else {
tags.addLast(tag);
}
}
if (tags.size() == 0) {
this.xmlEndLine = line;
break;
}
pos = newPos;
}
else {
pos++;
}
}
}
return tags.size() == 0;
}
return false;
}
}