From cc5973ab94e521389ab5448c16cd9c78bb816c36 Mon Sep 17 00:00:00 2001
From: Menci <huanghaorui301@gmail.com>
Date: Mon, 25 Mar 2019 12:25:39 +0800
Subject: [PATCH] Add loose mode to allow whitespace immediately after inline
 opening, fix #21

---
 README.md                    |  1 +
 dist/markdown-it-math.js     | 11 ++++++-----
 dist/markdown-it-math.min.js |  2 +-
 index.js                     | 11 ++++++-----
 test/options.js              | 11 +++++++++++
 5 files changed, 25 insertions(+), 11 deletions(-)

diff --git a/README.md b/README.md
index fc67f36..0f16b81 100644
--- a/README.md
+++ b/README.md
@@ -49,6 +49,7 @@ var options = {
     blockOpen: '$$$',
     blockClose: '$$$',
     renderingOptions: {},
+    loose: false, // true to allow whitespace immediately after inline opening, see #21
     inlineRenderer: require('ascii2mathml')(this.rendererOptions),
     blockRenderer: require('ascii2mathml')(Object.assign({ display: 'block' },
                                                          this.renderingOptions))
diff --git a/dist/markdown-it-math.js b/dist/markdown-it-math.js
index 0ba7e92..7daa082 100644
--- a/dist/markdown-it-math.js
+++ b/dist/markdown-it-math.js
@@ -1515,7 +1515,7 @@ function scanDelims(state, start, delimLength) {
 }
 
 
-function makeMath_inline(open, close) {
+function makeMath_inline(open, close, loose) {
   return function math_inline(state, silent) {
     var startCount,
         found,
@@ -1532,7 +1532,7 @@ function makeMath_inline(open, close) {
     res = scanDelims(state, start, openDelim.length);
     startCount = res.delims;
 
-    if (!res.can_open) {
+    if (!(res.can_open || loose)) {
       state.pos += startCount;
       // Earlier we checked !silent, but this implementation does not need it
       state.pending += state.src.slice(start, state.pos);
@@ -1545,7 +1545,7 @@ function makeMath_inline(open, close) {
       closeDelim = state.src.slice(state.pos, state.pos + close.length);
       if (closeDelim === close) {
         res = scanDelims(state, state.pos, close.length);
-        if (res.can_close) {
+        if (res.can_close || loose) {
           found = true;
           break;
         }
@@ -1697,7 +1697,8 @@ module.exports = function math_plugin(md, options) {
   var inlineOpen = options.inlineOpen || '$$',
       inlineClose = options.inlineClose || '$$',
       blockOpen = options.blockOpen || '$$$',
-      blockClose = options.blockClose || '$$$';
+      blockClose = options.blockClose || '$$$',
+      loose = !!options.loose;
   var inlineRenderer = options.inlineRenderer ?
         function(tokens, idx) {
           return options.inlineRenderer(tokens[idx].content, tokens[idx]);
@@ -1710,7 +1711,7 @@ module.exports = function math_plugin(md, options) {
       makeMathRenderer(Object.assign({ display: 'block' },
                                      options.renderingOptions));
 
-  var math_inline = makeMath_inline(inlineOpen, inlineClose);
+  var math_inline = makeMath_inline(inlineOpen, inlineClose, loose);
   var math_block = makeMath_block(blockOpen, blockClose);
 
   md.inline.ruler.before('escape', 'math_inline', math_inline);
diff --git a/dist/markdown-it-math.min.js b/dist/markdown-it-math.min.js
index 749d98d..a542b8a 100644
--- a/dist/markdown-it-math.min.js
+++ b/dist/markdown-it-math.min.js
@@ -1 +1 @@
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if(f){if(0===(c-=1)){r=s+((i=f[0]).length-1);break}s+=f[0].length}else s+=1}return n?[0===t?"":e.slice(0,t),p.groupings.open.get(n),e.slice(t+n.length,i?r-(i.length-1):e.length),i?p.groupings.close.get(i):"",r?e.slice(r+1):""]:null}function o(e){var t,r,n,i=e.indexOf("|"),o=i+1,a=e.slice(i+1),c=a.startsWith("|"),s=c?/\|\|/:/\|/;if(c&&(a=a.slice(1),o+=1),-1===a.indexOf("|"))return null;if(a.match(/^\.?[_\^]/))return null;for(;0<a.length;){var l=m(a),u=l?l[0]:a,f=l?l[4]:"",p=s.exec(u);if(p)return t=i,r=o+p.index,n=c,[0===t?"":e.slice(0,t),n?"\u2016":"|",e.slice(t+(n?2:1),r),n?"\u2016":"|",e.slice(r+(n?2:1))];o+=l.slice(0,-1).map(d("length")).reduce(h),""===l[1]?o+=2:"\u2329"===l[1]&&(o+=1),""===l[3]?o+=2:"\u232a"===l[3]&&(o+=1),a=f}return null}function d(t){return function(e){return e[t]}}function h(e,t){return e+t}function a(e){var t=new RegExp("^("+p.fonts.regexp.source+" ?)?"+e);return function(e){return t.exec(e)}}var s=a("(`)\\w+`"),l=a('(")');var c=["<mi>lim</mi>","<mo>\u2211</mo>","<mo>\u220f</mo>"];var u={endsInFunc:function(e){return e.match(n)},isgroupStart:i,isgroupable:function(e,t){var r=new RegExp("^[0-9A-Za-z+\\-!]{2,}(\\s|".concat(t.colSep,"|").concat(t.rowSep,")"));return e.match(r)},isvertGroupStart:function(e){if(!e.startsWith("|"))return!1;var t=o(e);return t&&""===t[0]},splitNextGroup:m,splitNextVert:o,splitNextOperator:function(e){var t=new RegExp("^"+p.operators.regexp.source).exec(e)[0];return[p.operators.get(t),e.slice(t.length)]},ismatrixInterior:function(e,t,r){if(!i(e))return!1;var n=m(e)[4];if(!(n.trim().startsWith(t)||n.match(/^\s*\n/)&&i(n.trim())))return!1;for(;n&&n.trim();)if((n=(m(n)||[])[4])&&(n.startsWith(r)||n.match(/^\s*\n/)))return!1;return!0},isfontCommand:function(e){return s(e)||l(e)},splitfont:function(e){var t=s(e)||l(e),r=t&&t[2],n=t&&t[3],i='"'===n?"mtext":"`"===n?"mi":"",o=e.indexOf(n),a=o+1+e.slice(o+1).indexOf(n),c=0<o?p.fonts.get(r):"";return{tagname:i,text:e.slice(o+1,a),font:c,rest:e.slice(a+1)}},shouldGoUnder:function(e){return 0<=c.indexOf(e)}};r.default=u},{"./lexicon":3}],6:[function(e,t,r){"use strict";var n=null;function p(e,t,r){var n,i,o,a,c=t,s=!0,l=!0,u=e.posMax,f=e.md.utils.isWhiteSpace;return n=0<t?e.src.charCodeAt(t-1):32,u<=c&&!1,o=(c+=r)-t,i=c<u?e.src.charCodeAt(c):32,a=f(n),f(i)&&(s=!1),a&&(l=!1),{can_open:s,can_close:l,delims:o}}function f(t){if(null===n)try{n=e("ascii2mathml").default}catch(e){return t&&"block"===t.display?function(e,t){return'<div class="math block">'+e[t].content+"</div>"}:function(e,t){return'<span class="math inline">'+e[t].content+"</span>"}}var r=n(Object.assign({},t));return t&&"block"===t.display?function(e,t){return r(e[t].content)+"\n"}:function(e,t){return r(e[t].content)}}e("./lib/polyfills"),t.exports=function(e,r){var t=(r="object"==typeof r?r:{}).inlineOpen||"$$",n=r.inlineClose||"$$",i=r.blockOpen||"$$$",o=r.blockClose||"$$$",a=!!r.loose,c=r.inlineRenderer?function(e,t){return r.inlineRenderer(e[t].content,e[t])}:f(r.renderingOptions),s=r.blockRenderer?function(e,t){return r.blockRenderer(e[t].content,e[t])+"\n"}:f(Object.assign({display:"block"},r.renderingOptions)),l=function(l,u,f){return function(e,t){var r,n,i,o,a=e.posMax,c=e.pos,s=e.src.slice(c,c+l.length);if(s!==l)return!1;if(t)return!1;if(r=(i=p(e,c,s.length)).delims,!i.can_open&&!f)return e.pos+=r,e.pending+=e.src.slice(c,e.pos),!0;for(e.pos=c+l.length;e.pos<a;){if(e.src.slice(e.pos,e.pos+u.length)===u&&((i=p(e,e.pos,u.length)).can_close||f)){n=!0;break}e.md.inline.skipToken(e)}return n?(e.posMax=e.pos,e.pos=c+u.length,(o=e.push("math_inline","math",0)).content=e.src.slice(e.pos,e.posMax),o.markup=l,e.pos=e.posMax+u.length,e.posMax=a,!0):(e.pos=c,!1)}}(t,n,a),u=function(m,d){return function(e,t,r,n){var i,o,a,c,s,l,u=!1,f=e.bMarks[t]+e.tShift[t],p=e.eMarks[t];if(f+m.length>p)return!1;if(e.src.slice(f,f+m.length)!==m)return!1;if(f+=m.length,c=e.src.slice(f,p),n)return!0;for(c.trim().slice(-d.length)===d&&(c=c.trim().slice(0,-d.length),u=!0),o=t;!(u||r<=++o||(f=e.bMarks[o]+e.tShift[o])<(p=e.eMarks[o])&&e.tShift[o]<e.blkIndent);)e.src.slice(f,p).trim().slice(-d.length)===d&&(4<=e.tShift[o]-e.blkIndent||(l=e.src.slice(0,p).lastIndexOf(d),f+=(s=e.src.slice(f,l)).length+d.length,(f=e.skipSpaces(f))<p||(u=!0)));return i=e.tShift[t],e.line=o+(u?1:0),(a=e.push("math_block","math",0)).block=!0,a.content=(c&&c.trim()?c+"\n":"")+e.getLines(t+1,o,i,!0)+(s&&s.trim()?s:""),a.info=void 0,a.map=[t,e.line],a.markup=m,!0}}(i,o);e.inline.ruler.before("escape","math_inline",l),e.block.ruler.after("blockquote","math_block",u,{alt:["paragraph","reference","blockquote","list"]}),e.renderer.rules.math_inline=c,e.renderer.rules.math_block=s}},{"./lib/polyfills":1,ascii2mathml:2}]},{},[6])(6)});
diff --git a/index.js b/index.js
index 5db1ef2..836af6e 100644
--- a/index.js
+++ b/index.js
@@ -50,7 +50,7 @@ function scanDelims(state, start, delimLength) {
 }
 
 
-function makeMath_inline(open, close) {
+function makeMath_inline(open, close, loose) {
   return function math_inline(state, silent) {
     var startCount,
         found,
@@ -67,7 +67,7 @@ function makeMath_inline(open, close) {
     res = scanDelims(state, start, openDelim.length);
     startCount = res.delims;
 
-    if (!res.can_open) {
+    if (!(res.can_open || loose)) {
       state.pos += startCount;
       // Earlier we checked !silent, but this implementation does not need it
       state.pending += state.src.slice(start, state.pos);
@@ -80,7 +80,7 @@ function makeMath_inline(open, close) {
       closeDelim = state.src.slice(state.pos, state.pos + close.length);
       if (closeDelim === close) {
         res = scanDelims(state, state.pos, close.length);
-        if (res.can_close) {
+        if (res.can_close || loose) {
           found = true;
           break;
         }
@@ -232,7 +232,8 @@ module.exports = function math_plugin(md, options) {
   var inlineOpen = options.inlineOpen || '$$',
       inlineClose = options.inlineClose || '$$',
       blockOpen = options.blockOpen || '$$$',
-      blockClose = options.blockClose || '$$$';
+      blockClose = options.blockClose || '$$$',
+      loose = !!options.loose;
   var inlineRenderer = options.inlineRenderer ?
         function(tokens, idx) {
           return options.inlineRenderer(tokens[idx].content, tokens[idx]);
@@ -245,7 +246,7 @@ module.exports = function math_plugin(md, options) {
       makeMathRenderer(Object.assign({ display: 'block' },
                                      options.renderingOptions));
 
-  var math_inline = makeMath_inline(inlineOpen, inlineClose);
+  var math_inline = makeMath_inline(inlineOpen, inlineClose, loose);
   var math_block = makeMath_block(blockOpen, blockClose);
 
   md.inline.ruler.before('escape', 'math_inline', math_inline);
diff --git a/test/options.js b/test/options.js
index 3aa3e79..f486d0e 100644
--- a/test/options.js
+++ b/test/options.js
@@ -31,6 +31,17 @@ describe('Options', function() {
     assert.equal(res1, '<p><math><mrow><mn>1</mn><mo>+</mo><mn>1</mn></mrow><mo>=</mo><mn>2</mn></math></p>\n');
     assert.equal(res2, '<math display="block"><mrow><mn>1</mn><mo>+</mo><mn>1</mn></mrow><mo>=</mo><mn>2</mn></math>\n');
   });
+  it('Should allow whitespace immediately after inline opening in loose mode', function() {
+    var md = require('markdown-it')()
+          .use(require('../'), {
+            inlineOpen: '$',
+            inlineClose: '$',
+            loose: true
+          });
+
+    var res = md.render('$ 1+1 = 2 $');
+    assert.equal(res, '<p><math><mrow><mn>1</mn><mo>+</mo><mn>1</mn></mrow><mo>=</mo><mn>2</mn></math></p>\n');
+  });
 });
 
 describe("Rendering options", function() {