1 | var traceur = require('traceur');
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2 |
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3 | var traceurGet = require('./utils').traceurGet;
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4 |
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5 | var ParseTreeTransformer = traceurGet('codegeneration/ParseTreeTransformer.js').ParseTreeTransformer;
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6 |
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7 | var getCanonicalName = require('./utils').getCanonicalName;
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8 |
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9 | var Promise = require('bluebird');
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10 |
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11 | function DeferredImportsTransformer(map) {
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12 | this.imports = [];
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13 | return ParseTreeTransformer.apply(this, arguments);
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14 | }
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15 |
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16 | DeferredImportsTransformer.prototype = Object.create(ParseTreeTransformer.prototype);
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17 |
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18 | DeferredImportsTransformer.prototype.transformCallExpression = function(tree) {
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19 | tree = ParseTreeTransformer.prototype.transformCallExpression.call(this, tree);
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20 |
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21 | if (tree.operand.type == 'MEMBER_EXPRESSION'
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22 | && tree.operand.memberName.value == 'import'
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23 | && tree.operand.operand.type == 'IDENTIFIER_EXPRESSION'
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24 | && tree.operand.operand.identifierToken.value == 'System'
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25 | && tree.args.args.length == 1) {
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26 |
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27 | if (tree.args.args[0].type === 'LITERAL_EXPRESSION')
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28 | this.imports.push(tree.args.args[0].literalToken.processedValue);
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29 | }
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30 |
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31 | return tree;
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32 | }
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33 |
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34 | module.exports = function(builder, trace) {
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35 | var deferredImports = [];
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36 |
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37 | return Promise.all(Object.keys(trace).map(function(name) {
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38 | var load = trace[name];
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39 |
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40 | if (load.deferredImports) {
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41 | deferredImports = deferredImports.concat(load.deferredImports);
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42 | return;
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43 | }
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44 |
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45 | var curDeferredImports = [];
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46 |
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47 | if (!load || load.conditional)
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48 | return;
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49 |
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50 | var compiler = new traceur.Compiler({ script: load.metadata.format !== 'esm' });
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51 |
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52 | var tree = compiler.parse(load.source, load.path);
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53 |
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54 | var transformer = new DeferredImportsTransformer();
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55 |
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56 | tree = transformer.transformAny(tree);
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57 |
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58 | return Promise.all(transformer.imports.map(function(impt) {
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59 | return builder.loader.normalize(impt)
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60 | .then(function(moduleName) {
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61 | var canonical = getCanonicalName(builder.loader, moduleName);
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62 |
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63 | curDeferredImports.push({
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64 | name: canonical,
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65 | parent: name
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66 | });
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67 | });
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68 | }))
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69 | .then(function() {
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70 |
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71 | load.deferredImports = curDeferredImports;
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72 | deferredImports = deferredImports.concat(curDeferredImports);
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73 | });
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74 | }))
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75 | .then(function() {
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76 | return deferredImports;
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77 | });
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78 | }; |
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