structure, layout and automation

node_modules/@gulp-sourcemaps/identity-map/lib/generate.js

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+'use strict';
+
+var css = require('css');
+var acorn = require('acorn');
+var SourceMapGenerator = require('source-map').SourceMapGenerator;
+
+function generateJs(sourcePath, fileContent) {
+  var generator = new SourceMapGenerator({ file: sourcePath });
+  var tokenizer = acorn.tokenizer(fileContent, { allowHashBang: true, locations: true });
+
+  while (true) {
+    var token = tokenizer.getToken();
+
+    if (token.type.label === 'eof') {
+      break;
+    }
+    var mapping = {
+      original: token.loc.start,
+      generated: token.loc.start,
+      source: sourcePath,
+    };
+    if (token.type.label === 'name') {
+      mapping.name = token.value;
+    }
+    generator.addMapping(mapping);
+  }
+  generator.setSourceContent(sourcePath, fileContent);
+
+  return generator.toJSON();
+}
+
+function generateCss(sourcePath, fileContent) {
+  var generator = new SourceMapGenerator({ file: sourcePath });
+  var ast = css.parse(fileContent, { silent: true });
+
+  function registerTokens(ast) {
+    if (ast.position) {
+      generator.addMapping({
+        original: ast.position.start,
+        generated: ast.position.start,
+        source: sourcePath,
+      });
+    }
+
+    for (var key in ast) {
+      if (key === 'position' || !ast[key]) {
+        continue;
+      }
+      if (Object.prototype.toString.call(ast[key]) === '[object Object]') {
+        registerTokens(ast[key]);
+      } else if (Array.isArray(ast[key])) {
+        ast[key].forEach(registerTokens);
+      }
+    }
+  }
+  registerTokens(ast);
+  generator.setSourceContent(sourcePath, fileContent);
+
+  return generator.toJSON();
+}
+
+module.exports = {
+  js: generateJs,
+  css: generateCss,
+};