Sanitize emphasis
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hns
parent
fc689d9a12
commit
219a5df9ff
1 changed files with 90 additions and 61 deletions
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@ -18,7 +18,7 @@ public class MarkdownProcessor {
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private boolean listParagraphs = false;
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private int codeEndMarker = 0;
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private ElementStack stack = new ElementStack();
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private HashMap spanTags;
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private Emphasis[] emph = new Emphasis[2];
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private String result = null;
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@ -249,7 +249,6 @@ public class MarkdownProcessor {
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private synchronized void secondPass() {
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state = NEWLINE;
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stack.add(new BaseElement());
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spanTags = new HashMap();
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buffer = new StringBuilder((int) (length * 1.2));
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line = 1;
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boolean escape = false;
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@ -320,9 +319,9 @@ public class MarkdownProcessor {
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if (state == HEADER) {
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if (c == '#') {
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((Element) stack.peek()).m ++;
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((Element) stack.peek()).mod++;
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} else {
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((Element) stack.peek()).m = 0;
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((Element) stack.peek()).mod = 0;
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}
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}
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@ -346,8 +345,8 @@ public class MarkdownProcessor {
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}
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if (state == HEADER) {
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Element header = (Element) stack.pop();
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if (header.m > 0) {
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buffer.setLength(buffer.length() - header.m);
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if (header.mod > 0) {
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buffer.setLength(buffer.length() - header.mod);
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}
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header.close();
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}
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@ -415,6 +414,14 @@ public class MarkdownProcessor {
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}
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private boolean checkEmphasis(char c) {
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for (int l = 1; l >= 0; l--) {
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if (emph[l] != null && emph[l].end == i) {
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emph[l].close();
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i += emph[l].mod;
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emph[l] = null;
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return true;
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}
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}
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if (c == '*' || c == '_') {
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int n = 1;
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int j = i + 1;
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@ -424,68 +431,50 @@ public class MarkdownProcessor {
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}
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int found = n;
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boolean isStartTag = j < length - 1 && !Character.isWhitespace(chars[j]);
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boolean isEndTag = i > 0 && !Character.isWhitespace(chars[i - 1]);
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boolean hasStrong = spanTags.get(Integer.valueOf(2)) != null;
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boolean hasEmphasis = spanTags.get(Integer.valueOf(1)) != null;
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if (isStartTag && (!hasStrong || !hasEmphasis)) {
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List matchingEndTags = new ArrayList();
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if (isStartTag && (emph[0] == null || emph[1] == null)) {
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List possibleEndTags = new ArrayList();
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char lastChar = 0;
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int count = 0;
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boolean escape = false;
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for (int k = j; k < length; k++) {
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if (chars[k] == '\n' && lastChar == '\n') {
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break;
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}
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if (chars[k] == c) {
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lastChar = chars[k];
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System.err.println(k + ": " + chars[k]);
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if (escape) {
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escape = false;
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} else {
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if (chars[k] == '\\') {
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escape = true;
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} else if (chars[k] == '`') {
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k = skipCodeSpan(k);
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} else if (chars[k] == c) {
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count += 1;
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} else {
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if (count > 0 && !Character.isWhitespace(chars[k - count - 1])) {
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matchingEndTags.add(Integer.valueOf(count));
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// add an int array to possible end tags: [position, nuberOfTokens]
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possibleEndTags.add(new int[] {k - count, count});
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}
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count = 0;
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}
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lastChar = chars[k];
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}
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}
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String[] tryElements = {
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hasEmphasis ? null : "em",
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hasStrong || n < 2 ? null : "strong"
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};
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Stack matchedElements = new Stack();
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for (int l = tryElements.length - 1; l >= 0; l--) {
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for (int k = 0; k < matchingEndTags.size(); k++) {
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// FIXME bogus check
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if (matchedElements.size() == tryElements.length) {
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break;
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}
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if (n > l && tryElements[l] != null && ((Integer) matchingEndTags.get(k)).intValue() > l) {
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matchedElements.add(tryElements[l]);
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for (int l = 1; l >= 0; l--) {
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if (emph[l] == null && n > l) {
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emph[l] = checkEmphasisInternal(l + 1, possibleEndTags);
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if (emph[l] != null) {
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n -= l + 1;
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matchingEndTags.set(k, Integer.valueOf(((Integer) matchingEndTags.get(k)).intValue() - l + 1));
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tryElements[l] = null;
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}
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}
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}
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while (matchedElements.size() > 0) {
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String ctor = (String) matchedElements.pop();
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Element elem = "em".equals(ctor) ? (Element) new Emphasis() : new Strong();
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elem.open();
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spanTags.put(Integer.valueOf("strong".equals(ctor) ? 2 : 1), elem);
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}
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}
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if (isEndTag) {
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for (int z = 2; z > 0; z--) {
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Element elem = (Element) spanTags.get(Integer.valueOf(z));
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if (elem != null && elem.m <= n) {
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spanTags.remove(Integer.valueOf(z));
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elem.close();
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n -= elem.m;
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}
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}
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}
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if (n == found) {
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return false;
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}
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// write out remaining token chars
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for (int m = 0; m < n; m++) {
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buffer.append(c);
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}
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@ -495,6 +484,20 @@ public class MarkdownProcessor {
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return false;
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}
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private Emphasis checkEmphasisInternal(int length, List possibleEndTags) {
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for (int k = 0; k < possibleEndTags.size(); k++) {
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int[] possibleEndTag = (int[]) possibleEndTags.get(k);
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if (possibleEndTag[1] >= length) {
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Emphasis elem = new Emphasis(length, possibleEndTag[0]);
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elem.open();
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possibleEndTag[0] += length;
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possibleEndTag[1] -= length;
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return elem;
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}
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}
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return null;
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}
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private boolean checkCodeSpan(char c) {
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if (c != '`') {
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return false;
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@ -542,6 +545,37 @@ public class MarkdownProcessor {
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return true;
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}
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// find the end of a code span starting at start
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private int skipCodeSpan(int start) {
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int n = 0; // additional backticks to match
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int j = start + 1;
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while(j < length && chars[j] == '`') {
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n += 1;
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j += 1;
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}
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outer: while(j < length) {
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if (chars[j] == '`') {
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if (n == 0) {
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break;
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} else {
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if (j + n >= length) {
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return start + 1;
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}
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for (int k = j + 1; k <= j + n; k++) {
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if (chars[k] != '`') {
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break;
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} else if (k == j + n) {
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j = k;
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break outer;
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}
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}
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}
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}
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j += 1;
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}
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return j;
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}
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private boolean checkLink(char c) {
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return checkLinkInternal(c, i + 1, false);
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}
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@ -1089,7 +1123,7 @@ public class MarkdownProcessor {
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class Element {
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String tag;
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int nesting, m;
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int nesting, mod;
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void open() {
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openTag(tag, buffer);
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@ -1145,16 +1179,11 @@ public class MarkdownProcessor {
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}
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class Emphasis extends Element {
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Emphasis() {
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this.tag = "em";
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this.m = 1;
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}
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}
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class Strong extends Element {
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Strong() {
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this.tag = "strong";
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this.m = 2;
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int end;
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Emphasis(int mod, int end) {
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this.mod = mod;
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this.end = end;
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this.tag = mod == 1 ? "em" : "strong";
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}
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}
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