mirror of
https://github.com/Jermolene/TiddlyWiki5
synced 2024-12-12 19:20:27 +00:00
20 lines
2.7 KiB
JavaScript
20 lines
2.7 KiB
JavaScript
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"use strict";const rkatex=(md,options)=>{const backslash='\\';const dollar='$';const opts=options||{};const delimiter=opts.delimiter||dollar;if(delimiter.length!==1){throw new Error('invalid delimiter');}
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const katex=require("katex");const renderKatex=(source,displayMode)=>katex.renderToString(source,{displayMode:displayMode,throwOnError:false});const parseBlockKatex=(state,startLine,endLine)=>{let haveEndMarker=false;let pos=state.bMarks[startLine]+state.tShift[startLine];let max=state.eMarks[startLine];if(pos+1>max){return false;}
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const marker=state.src.charAt(pos);if(marker!==delimiter){return false;}
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let mem=pos;pos=state.skipChars(pos,marker);let len=pos-mem;if(len!==2){return false;}
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let nextLine=startLine;for(;;){++nextLine;if(nextLine>=endLine){break;}
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pos=mem=state.bMarks[nextLine]+state.tShift[nextLine];max=state.eMarks[nextLine];if(pos<max&&state.tShift[nextLine]<state.blkIndent){break;}
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if(state.src.charAt(pos)!==delimiter){continue;}
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if(state.tShift[nextLine]-state.blkIndent>=4){continue;}
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pos=state.skipChars(pos,marker);if(pos-mem<len){continue;}
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pos=state.skipSpaces(pos);if(pos<max){continue;}
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haveEndMarker=true;break;}
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len=state.tShift[startLine];state.line=nextLine+(haveEndMarker?1:0);const content=state.getLines(startLine+1,nextLine,len,true).replace(/[ \n]+/g,' ').trim();state.tokens.push({type:'katex',params:null,content:content,lines:[startLine,state.line],level:state.level,block:true});return true;};const parseInlineKatex=(state,silent)=>{const start=state.pos;const max=state.posMax;let pos=start;if(state.src.charAt(pos)!==delimiter){return false;}
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++pos;while(pos<max&&state.src.charAt(pos)===delimiter){++pos;}
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const marker=state.src.slice(start,pos);if(marker.length>2){return false;}
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const spanStart=pos;let escapedDepth=0;while(pos<max){const char=state.src.charAt(pos);if(char==='{'&&(pos==0||state.src.charAt(pos-1)!=backslash)){escapedDepth+=1;}else if(char==='}'&&(pos==0||state.src.charAt(pos-1)!=backslash)){escapedDepth-=1;if(escapedDepth<0){return false;}}else if(char===delimiter&&escapedDepth===0){const matchStart=pos;let matchEnd=pos+1;while(matchEnd<max&&state.src.charAt(matchEnd)===delimiter){++matchEnd;}
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if(matchEnd-matchStart===marker.length){if(!silent){const content=state.src.slice(spanStart,matchStart).replace(/[ \n]+/g,' ').trim();state.push({type:'katex',content:content,block:marker.length>1,level:state.level});}
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state.pos=matchEnd;return true;}}
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pos+=1;}
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if(!silent){state.pending+=marker;}
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state.pos+=marker.length;return true;};md.inline.ruler.push('katex',parseInlineKatex,options);md.block.ruler.push('katex',parseBlockKatex,options);md.renderer.rules.katex=(tokens,idx)=>renderKatex(tokens[idx].content,tokens[idx].block);md.renderer.rules.katex.delimiter=delimiter;};module.exports=rkatex;
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