fix: source map generation (following #150) (#161)

* fix: source map (following #150)

* lint map.test.js

Co-authored-by: essentia0 <contact@essentia0.me>

lib/LessParser.js

@@ -67,9 +67,8 @@ module.exports = class LessParser extends Parser {
     const node = new Comment();
     const text = token[1].slice(2);
 
-    this.init(node, token[2], token[3]);
-
-    node.source.end = { line: token[4], column: token[5] };
+    this.init(node, token[2]);
+    node.source.end = this.getPosition(token[3] || token[2]);
     node.inline = true;
     node.raws.begin = '//';
 

lib/nodes/inline-comment.js

@@ -33,7 +33,7 @@ module.exports = {
         token = this.tokenizer.nextToken({ ignoreUnclosed: true });
       }
 
-      const newToken = ['comment', bits.join(''), first[2], first[3], last[2], last[3]];
+      const newToken = ['comment', bits.join(''), first[2], last[2]];
       this.inlineComment(newToken);
 
       // Replace tokenizer to retokenize the rest of the string

lib/nodes/interpolation.js

@@ -22,9 +22,7 @@ module.exports = {
     const words = tokens.map((tokn) => tokn[1]);
     [first] = tokens;
     const last = tokens.pop();
-    const start = [first[2], first[3]];
-    const end = [last[4] || last[2], last[5] || last[3]];
-    const newToken = ['word', words.join('')].concat(start, end);
+    const newToken = ['word', words.join(''), first[2], last[2]];
 
     this.tokenizer.back(token);
     this.tokenizer.back(newToken);

test/map.test.js

@@ -0,0 +1,46 @@
+const { readFileSync } = require('fs');
+
+const { join } = require('path');
+
+const test = require('ava');
+const postcss = require('postcss');
+
+const syntax = require('../lib');
+
+const { parser } = syntax;
+
+// silence the rediculously verbose "You did not set any plugins, parser, or
+// stringifier" warnings in PostCSS.
+console.warn = () => {}; // eslint-disable-line no-console
+
+test('should parse LESS integration syntax and generate a source map', async (t) => {
+  const less = readFileSync(join(__dirname, './integration/ext.cx.dashboard.less'), 'utf-8');
+  const result = await postcss().process(less, {
+    syntax,
+    parser,
+    map: { inline: false, annotation: false, sourcesContent: true }
+  });
+
+  t.truthy(result);
+  t.is(result.css, less);
+  t.is(result.content, less);
+  t.truthy(result.map);
+});
+
+test('should parse LESS inline comment syntax and generate a source map', async (t) => {
+  const less = `
+  a {
+    //background-color: red;
+  }
+  `;
+  const result = await postcss().process(less, {
+    syntax,
+    parser,
+    map: { inline: false, annotation: false, sourcesContent: true }
+  });
+
+  t.truthy(result);
+  t.is(result.css, less);
+  t.is(result.content, less);
+  t.truthy(result.map);
+});