Merge pull request #3 from PaulSohn/patch-1
Fixed index.js delimeter logic
This commit is contained in:
Waylon Flinn
commit
2a45cb8b71
1 changed files with 111 additions and 208 deletions
247
index.js
247
index.js
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@ -11,229 +11,129 @@ for rendering output.
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var katex = require('katex');
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//return if we have valid delimiter, '$', is in the position.
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function isValidDelim(state) {
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var lastChar, secondLastChar, nextChar, pos = state.pos;
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function scanDelims(state, start, delimLength) {
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var pos = start, lastChar, nextChar, count, can_open, can_close,
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isLastWhiteSpace, isLastPunctChar,
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isNextWhiteSpace, isNextPunctChar,
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left_flanking = true,
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right_flanking = true,
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max = state.posMax,
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isWhiteSpace = state.md.utils.isWhiteSpace,
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isPunctChar = state.md.utils.isPunctChar,
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isMdAsciiPunct = state.md.utils.isMdAsciiPunct;
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// treat beginning of the line as a whitespace
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lastChar = start > 0 ? state.src.charCodeAt(start - 1) : 0x20;
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if (pos >= max) {
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can_open = false;
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if(state.src[pos]!=='$'){
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return false; //the character $ must be in its position.
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}
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pos += delimLength;
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secondLastChar= pos > 1 ? state.src[pos-2] : ' '
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lastChar = pos > 0 ? state.src[pos-1] : ' '
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nextChar = pos + 1 < state.src.length ? state.src[pos+1] : ' '
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count = pos - start;
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// treat end of the line as a whitespace
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nextChar = pos < max ? state.src.charCodeAt(pos) : 0x20;
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isLastPunctChar = isMdAsciiPunct(lastChar) || isPunctChar(String.fromCharCode(lastChar));
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isNextPunctChar = isMdAsciiPunct(nextChar) || isPunctChar(String.fromCharCode(nextChar));
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isLastWhiteSpace = isWhiteSpace(lastChar);
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isNextWhiteSpace = isWhiteSpace(nextChar);
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if (isNextWhiteSpace) {
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left_flanking = false;
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} else if (isNextPunctChar) {
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if (!(isLastWhiteSpace || isLastPunctChar)) {
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left_flanking = false;
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}
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if(
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lastChar === '\\' //$ we found was escaped.
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|| (lastChar === '$' && secondLastChar !== '\\') // $ we found was after $ but not escaped.
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|| nextChar === '$' //$ we found was actually block delimiter $$.
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)
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{
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return false;
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}
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if (isLastWhiteSpace) {
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right_flanking = false;
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} else if (isLastPunctChar) {
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if (!(isNextWhiteSpace || isNextPunctChar)) {
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right_flanking = false;
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}
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}
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can_open = left_flanking;
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can_close = right_flanking;
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return {
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can_open: can_open,
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can_close: can_close,
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delims: count
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};
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}
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function makeMath_inline(open, close) {
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return function math_inline(state, silent) {
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var startCount,
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found,
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res,
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token,
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closeDelim,
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max = state.posMax,
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start = state.pos,
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openDelim = state.src.slice(start, start + open.length);
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if (openDelim !== open) { return false; }
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if (silent) { return false; } // Don’t run any pairs in validation mode
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res = scanDelims(state, start, openDelim.length);
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startCount = res.delims;
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if (!res.can_open) {
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state.pos += startCount;
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// Earlier we checked !silent, but this implementation does not need it
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state.pending += state.src.slice(start, state.pos);
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return true;
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}
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state.pos = start + open.length;
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function math_inline(state, silent){
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var start, found = false, token;
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if(silent) { return false; }
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while (state.pos < max) {
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closeDelim = state.src.slice(state.pos, state.pos + close.length);
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if (closeDelim === close) {
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res = scanDelims(state, state.pos, close.length);
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if (res.can_close) {
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start = state.pos;
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if(state.src[start] !== '$'){ return false; }
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if(!isValidDelim(state)){
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state.pos += 1;
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state.pending += '$';
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return true;
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}
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state.pos+=1;
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while(state.pos < state.posMax){
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if(isValidDelim(state)){
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found = true;
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break;
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}
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}
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state.md.inline.skipToken(state);
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}
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if(!found){
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// Parser failed to find ending tag, so it is not a valid math
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// Parser failed to find closing delimiter, so it is not a valid math
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state.pos = start;
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return false;
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}
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// Found!
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state.posMax = state.pos;
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state.pos = start + close.length;
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// Earlier we checked !silent, but this implementation does not need it
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//found the closing delimiter and state.pos is pointing it
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token = state.push('math_inline','math',0);
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token.content = state.src.slice(state.pos, state.posMax);
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token.markup = open;
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state.pos = state.posMax + close.length;
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state.posMax = max;
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token.content = state.src.slice(start+1,state.pos).trim();
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token.markup = '$';
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state.pos += 1;
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return true;
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};
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}
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function makeMath_block(open, close) {
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return function math_block(state, startLine, endLine, silent) {
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var openDelim, len, params, nextLine, token, firstLine, lastLine, lastLinePos,
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haveEndMarker = false,
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pos = state.bMarks[startLine] + state.tShift[startLine],
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max = state.eMarks[startLine];
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function math_block(state, start, end, silent){
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var firstLine, lastLine, next, lastPos, found = false, token,
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pos = state.bMarks[start] + state.tShift[start],
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max = state.eMarks[start]
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if (pos + open.length > max) { return false; }
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if(pos + 2 > max){ return false; }
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if(state.src.slice(pos,pos+2)!=='$$'){ return false; }
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openDelim = state.src.slice(pos, pos + open.length);
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if (openDelim !== open) { return false; }
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pos += open.length;
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pos += 2;
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firstLine = state.src.slice(pos,max);
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// Since start is found, we can report success here in validation mode
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if(silent){ return true; }
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if (firstLine.trim().slice(-close.length) === close) {
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if(firstLine.trim().slice(-2)==='$$'){
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// Single line expression
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firstLine = firstLine.trim().slice(0, -close.length);
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haveEndMarker = true;
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firstLine = firstLine.trim().slice(0, -2);
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found = true;
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}
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// search end of block
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nextLine = startLine;
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for (;;) {
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if (haveEndMarker) { break; }
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nextLine++;
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if (nextLine >= endLine) {
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// unclosed block should be autoclosed by end of document.
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// also block seems to be autoclosed by end of parent
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for(next = start; next < end; ){
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if(found){ break; }
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next++;
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pos = state.bMarks[next]+state.tShift[next];
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max = state.eMarks[next];
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if(pos < max && state.tShift[next] < state.blkIndent){
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break;
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}
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pos = state.bMarks[nextLine] + state.tShift[nextLine];
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max = state.eMarks[nextLine];
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if (pos < max && state.tShift[nextLine] < state.blkIndent) {
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// non-empty line with negative indent should stop the list:
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break;
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if(state.src.slice(pos,max).trim().slice(-2)==='$$'){
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lastPos = state.src.slice(0,max).lastIndexOf('$$');
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lastLine = state.src.slice(pos,lastPos);
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found = true;
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}
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}
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if (state.src.slice(pos, max).trim().slice(-close.length) !== close) {
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continue;
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if(!found){
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return false;
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}
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if (state.tShift[nextLine] - state.blkIndent >= 4) {
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// closing block math should be indented less then 4 spaces
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continue;
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}
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lastLinePos = state.src.slice(0, max).lastIndexOf(close);
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lastLine = state.src.slice(pos, lastLinePos);
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pos += lastLine.length + close.length;
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// make sure tail has spaces only
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pos = state.skipSpaces(pos);
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if (pos < max) { continue; }
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// found!
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haveEndMarker = true;
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}
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// If math block has heading spaces, they should be removed from its inner block
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len = state.tShift[startLine];
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state.line = nextLine + (haveEndMarker ? 1 : 0);
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state.line = next + 1;
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token = state.push('math_block', 'math', 0);
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token.block = true;
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token.content = (firstLine && firstLine.trim() ? firstLine + '\n' : '') +
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state.getLines(startLine + 1, nextLine, len, true) +
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(lastLine && lastLine.trim() ? lastLine : '');
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token.info = params;
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token.map = [ startLine, state.line ];
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token.markup = open;
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token.content = (firstLine && firstLine.trim() ? firstLine + '\n' : '')
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+ state.getLines(start + 1, next, state.tShift[start], true)
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+ (lastLine && lastLine.trim() ? lastLine : '');
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token.map = [ start, state.line ];
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token.markup = '$$';
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return true;
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};
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}
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module.exports = function math_plugin(md, options) {
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// Default options
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var inlineOpen = '$',
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inlineClose = '$',
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blockOpen = '$$',
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blockClose = '$$';
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options = options || {};
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// set KaTeX as the renderer for markdown-it-simplemath
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var katexInline = function(latex){
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options.displayMode = false;
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try{
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return katex.renderToString(latex, options);
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}
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catch(error){
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if(options.throwOnError){ console.log(error); }
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return latex;
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}
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};
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var inlineRenderer = function(tokens, idx){
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@ -242,16 +142,19 @@ module.exports = function math_plugin(md, options) {
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var katexBlock = function(latex){
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options.displayMode = true;
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try{
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return katex.renderToString(latex, options);
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}
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catch(error){
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if(options.throwOnError){ console.log(error); }
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return latex;
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}
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}
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var blockRenderer = function(tokens, idx){
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return katexBlock(tokens[idx].content) + '\n';
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}
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var math_inline = makeMath_inline(inlineOpen, inlineClose);
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var math_block = makeMath_block(blockOpen, blockClose);
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md.inline.ruler.before('escape', 'math_inline', math_inline);
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md.block.ruler.after('blockquote', 'math_block', math_block, {
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alt: [ 'paragraph', 'reference', 'blockquote', 'list' ]
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