1 | import * as _acorn from "acorn";
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2 |
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3 | const leftCurlyBrace = "{".charCodeAt(0);
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4 | const space = " ".charCodeAt(0);
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5 |
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6 | const keyword = "assert";
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7 | const FUNC_STATEMENT = 1, FUNC_HANGING_STATEMENT = 2, FUNC_NULLABLE_ID = 4
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8 |
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9 | export function importAssertions(Parser) {
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10 | // Use supplied version acorn version if present, to avoid
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11 | // reference mismatches due to different acorn versions. This
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12 | // allows this plugin to be used with Rollup which supplies
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13 | // its own internal version of acorn and thereby sidesteps
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14 | // the package manager.
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15 | const acorn = Parser.acorn || _acorn;
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16 | const { tokTypes: tt, TokenType } = acorn;
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17 |
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18 | return class extends Parser {
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19 | constructor(...args) {
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20 | super(...args);
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21 | this.assertToken = new TokenType(keyword);
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22 | }
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23 |
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24 | _codeAt(i) {
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25 | return this.input.charCodeAt(i);
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26 | }
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27 |
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28 | _eat(t) {
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29 | if (this.type !== t) {
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30 | this.unexpected();
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31 | }
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32 | this.next();
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33 | }
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34 |
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35 | readToken(code) {
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36 | let i = 0;
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37 | for (; i < keyword.length; i++) {
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38 | if (this._codeAt(this.pos + i) !== keyword.charCodeAt(i)) {
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39 | return super.readToken(code);
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40 | }
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41 | }
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42 |
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43 | // ensure that the keyword is at the correct location
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44 | // ie `assert{...` or `assert {...`
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45 | for (;; i++) {
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46 | if (this._codeAt(this.pos + i) === leftCurlyBrace) {
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47 | // Found '{'
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48 | break;
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49 | } else if (this._codeAt(this.pos + i) === space) {
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50 | // white space is allowed between `assert` and `{`, so continue.
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51 | continue;
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52 | } else {
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53 | return super.readToken(code);
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54 | }
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55 | }
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56 |
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57 | // If we're inside a dynamic import expression we'll parse
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58 | // the `assert` keyword as a standard object property name
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59 | // ie `import(""./foo.json", { assert: { type: "json" } })`
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60 | if (this.type.label === "{") {
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61 | return super.readToken(code);
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62 | }
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63 |
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64 | this.pos += keyword.length;
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65 | return this.finishToken(this.assertToken);
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66 | }
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67 |
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68 | parseDynamicImport(node) {
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69 | this.next(); // skip `(`
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70 |
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71 | // Parse node.source.
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72 | node.source = this.parseMaybeAssign();
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73 |
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74 | if (this.eat(tt.comma)) {
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75 | const obj = this.parseObj(false);
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76 | node.arguments = [obj];
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77 | }
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78 | this._eat(tt.parenR);
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79 | return this.finishNode(node, "ImportExpression");
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80 | }
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81 |
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82 | // ported from acorn/src/statement.js pp.parseExport
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83 | parseExport(node, exports) {
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84 | this.next();
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85 | // export * from '...'
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86 | if (this.eat(tt.star)) {
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87 | if (this.options.ecmaVersion >= 11) {
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88 | if (this.eatContextual("as")) {
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89 | node.exported = this.parseIdent(true);
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90 | this.checkExport(exports, node.exported.name, this.lastTokStart);
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91 | } else {
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92 | node.exported = null;
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93 | }
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94 | }
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95 | this.expectContextual("from");
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96 | if (this.type !== tt.string) { this.unexpected(); }
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97 | node.source = this.parseExprAtom();
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98 |
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99 | if (this.type === this.assertToken) {
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100 | this.next();
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101 | const assertions = this.parseImportAssertions();
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102 | if (assertions) {
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103 | node.assertions = assertions;
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104 | }
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105 | }
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106 |
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107 | this.semicolon();
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108 | return this.finishNode(node, "ExportAllDeclaration")
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109 | }
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110 | if (this.eat(tt._default)) { // export default ...
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111 | this.checkExport(exports, "default", this.lastTokStart);
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112 | var isAsync;
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113 | if (this.type === tt._function || (isAsync = this.isAsyncFunction())) {
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114 | var fNode = this.startNode();
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115 | this.next();
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116 | if (isAsync) { this.next(); }
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117 | node.declaration = this.parseFunction(fNode, FUNC_STATEMENT | FUNC_NULLABLE_ID, false, isAsync);
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118 | } else if (this.type === tt._class) {
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119 | var cNode = this.startNode();
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120 | node.declaration = this.parseClass(cNode, "nullableID");
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121 | } else {
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122 | node.declaration = this.parseMaybeAssign();
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123 | this.semicolon();
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124 | }
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125 | return this.finishNode(node, "ExportDefaultDeclaration")
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126 | }
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127 | // export var|const|let|function|class ...
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128 | if (this.shouldParseExportStatement()) {
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129 | node.declaration = this.parseStatement(null);
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130 | if (node.declaration.type === "VariableDeclaration")
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131 | { this.checkVariableExport(exports, node.declaration.declarations); }
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132 | else
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133 | { this.checkExport(exports, node.declaration.id.name, node.declaration.id.start); }
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134 | node.specifiers = [];
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135 | node.source = null;
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136 | } else { // export { x, y as z } [from '...']
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137 | node.declaration = null;
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138 | node.specifiers = this.parseExportSpecifiers(exports);
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139 | if (this.eatContextual("from")) {
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140 | if (this.type !== tt.string) { this.unexpected(); }
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141 | node.source = this.parseExprAtom();
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142 |
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143 | if (this.type === this.assertToken) {
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144 | this.next();
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145 | const assertions = this.parseImportAssertions();
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146 | if (assertions) {
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147 | node.assertions = assertions;
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148 | }
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149 | }
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150 | } else {
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151 | for (var i = 0, list = node.specifiers; i < list.length; i += 1) {
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152 | // check for keywords used as local names
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153 | var spec = list[i];
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154 |
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155 | this.checkUnreserved(spec.local);
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156 | // check if export is defined
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157 | this.checkLocalExport(spec.local);
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158 | }
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159 |
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160 | node.source = null;
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161 | }
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162 | this.semicolon();
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163 | }
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164 | return this.finishNode(node, "ExportNamedDeclaration")
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165 | }
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166 |
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167 | parseImport(node) {
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168 | this.next();
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169 | // import '...'
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170 | if (this.type === tt.string) {
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171 | node.specifiers = [];
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172 | node.source = this.parseExprAtom();
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173 | } else {
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174 | node.specifiers = this.parseImportSpecifiers();
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175 | this.expectContextual("from");
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176 | node.source =
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177 | this.type === tt.string ? this.parseExprAtom() : this.unexpected();
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178 | }
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179 |
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180 | if (this.type === this.assertToken) {
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181 | this.next();
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182 | const assertions = this.parseImportAssertions();
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183 | if (assertions) {
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184 | node.assertions = assertions;
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185 | }
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186 | }
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187 | this.semicolon();
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188 | return this.finishNode(node, "ImportDeclaration");
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189 | }
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190 |
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191 | parseImportAssertions() {
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192 | this._eat(tt.braceL);
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193 | const attrs = this.parseAssertEntries();
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194 | this._eat(tt.braceR);
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195 | return attrs;
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196 | }
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197 |
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198 | parseAssertEntries() {
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199 | const attrs = [];
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200 | const attrNames = new Set();
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201 |
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202 | do {
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203 | if (this.type === tt.braceR) {
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204 | break;
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205 | }
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206 |
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207 | const node = this.startNode();
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208 |
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209 | // parse AssertionKey : IdentifierName, StringLiteral
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210 | let assertionKeyNode;
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211 | if (this.type === tt.string) {
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212 | assertionKeyNode = this.parseLiteral(this.value);
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213 | } else {
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214 | assertionKeyNode = this.parseIdent(true);
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215 | }
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216 | this.next();
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217 | node.key = assertionKeyNode;
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218 |
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219 | // check if we already have an entry for an attribute
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220 | // if a duplicate entry is found, throw an error
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221 | // for now this logic will come into play only when someone declares `type` twice
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222 | if (attrNames.has(node.key.name)) {
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223 | this.raise(this.pos, "Duplicated key in assertions");
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224 | }
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225 | attrNames.add(node.key.name);
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226 |
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227 | if (this.type !== tt.string) {
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228 | this.raise(
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229 | this.pos,
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230 | "Only string is supported as an assertion value"
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231 | );
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232 | }
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233 |
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234 | node.value = this.parseLiteral(this.value);
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235 |
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236 | attrs.push(this.finishNode(node, "ImportAttribute"));
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237 | } while (this.eat(tt.comma));
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238 |
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239 | return attrs;
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240 | }
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241 | };
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242 | }
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