1 | "use strict";
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2 |
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3 | Object.defineProperty(exports, "__esModule", {
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4 | value: true
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5 | });
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6 | exports.explode = explode;
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7 | exports.merge = merge;
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8 | exports.verify = verify;
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9 |
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10 | var virtualTypes = require("./path/lib/virtual-types");
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11 |
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12 | var _t = require("@babel/types");
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13 |
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14 | const {
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15 | DEPRECATED_KEYS,
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16 | FLIPPED_ALIAS_KEYS,
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17 | TYPES
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18 | } = _t;
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19 |
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20 | function explode(visitor) {
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21 | if (visitor._exploded) return visitor;
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22 | visitor._exploded = true;
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23 |
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24 | for (const nodeType of Object.keys(visitor)) {
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25 | if (shouldIgnoreKey(nodeType)) continue;
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26 | const parts = nodeType.split("|");
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27 | if (parts.length === 1) continue;
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28 | const fns = visitor[nodeType];
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29 | delete visitor[nodeType];
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30 |
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31 | for (const part of parts) {
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32 | visitor[part] = fns;
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33 | }
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34 | }
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35 |
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36 | verify(visitor);
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37 | delete visitor.__esModule;
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38 | ensureEntranceObjects(visitor);
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39 | ensureCallbackArrays(visitor);
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40 |
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41 | for (const nodeType of Object.keys(visitor)) {
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42 | if (shouldIgnoreKey(nodeType)) continue;
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43 | const wrapper = virtualTypes[nodeType];
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44 | if (!wrapper) continue;
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45 | const fns = visitor[nodeType];
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46 |
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47 | for (const type of Object.keys(fns)) {
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48 | fns[type] = wrapCheck(wrapper, fns[type]);
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49 | }
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50 |
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51 | delete visitor[nodeType];
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52 |
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53 | if (wrapper.types) {
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54 | for (const type of wrapper.types) {
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55 | if (visitor[type]) {
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56 | mergePair(visitor[type], fns);
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57 | } else {
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58 | visitor[type] = fns;
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59 | }
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60 | }
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61 | } else {
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62 | mergePair(visitor, fns);
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63 | }
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64 | }
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65 |
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66 | for (const nodeType of Object.keys(visitor)) {
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67 | if (shouldIgnoreKey(nodeType)) continue;
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68 | const fns = visitor[nodeType];
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69 | let aliases = FLIPPED_ALIAS_KEYS[nodeType];
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70 | const deprecatedKey = DEPRECATED_KEYS[nodeType];
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71 |
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72 | if (deprecatedKey) {
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73 | console.trace(`Visitor defined for ${nodeType} but it has been renamed to ${deprecatedKey}`);
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74 | aliases = [deprecatedKey];
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75 | }
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76 |
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77 | if (!aliases) continue;
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78 | delete visitor[nodeType];
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79 |
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80 | for (const alias of aliases) {
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81 | const existing = visitor[alias];
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82 |
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83 | if (existing) {
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84 | mergePair(existing, fns);
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85 | } else {
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86 | visitor[alias] = Object.assign({}, fns);
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87 | }
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88 | }
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89 | }
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90 |
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91 | for (const nodeType of Object.keys(visitor)) {
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92 | if (shouldIgnoreKey(nodeType)) continue;
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93 | ensureCallbackArrays(visitor[nodeType]);
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94 | }
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95 |
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96 | return visitor;
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97 | }
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98 |
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99 | function verify(visitor) {
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100 | if (visitor._verified) return;
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101 |
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102 | if (typeof visitor === "function") {
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103 | throw new Error("You passed `traverse()` a function when it expected a visitor object, " + "are you sure you didn't mean `{ enter: Function }`?");
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104 | }
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105 |
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106 | for (const nodeType of Object.keys(visitor)) {
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107 | if (nodeType === "enter" || nodeType === "exit") {
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108 | validateVisitorMethods(nodeType, visitor[nodeType]);
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109 | }
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110 |
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111 | if (shouldIgnoreKey(nodeType)) continue;
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112 |
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113 | if (TYPES.indexOf(nodeType) < 0) {
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114 | throw new Error(`You gave us a visitor for the node type ${nodeType} but it's not a valid type`);
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115 | }
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116 |
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117 | const visitors = visitor[nodeType];
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118 |
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119 | if (typeof visitors === "object") {
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120 | for (const visitorKey of Object.keys(visitors)) {
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121 | if (visitorKey === "enter" || visitorKey === "exit") {
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122 | validateVisitorMethods(`${nodeType}.${visitorKey}`, visitors[visitorKey]);
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123 | } else {
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124 | throw new Error("You passed `traverse()` a visitor object with the property " + `${nodeType} that has the invalid property ${visitorKey}`);
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125 | }
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126 | }
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127 | }
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128 | }
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129 |
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130 | visitor._verified = true;
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131 | }
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132 |
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133 | function validateVisitorMethods(path, val) {
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134 | const fns = [].concat(val);
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135 |
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136 | for (const fn of fns) {
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137 | if (typeof fn !== "function") {
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138 | throw new TypeError(`Non-function found defined in ${path} with type ${typeof fn}`);
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139 | }
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140 | }
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141 | }
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142 |
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143 | function merge(visitors, states = [], wrapper) {
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144 | const rootVisitor = {};
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145 |
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146 | for (let i = 0; i < visitors.length; i++) {
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147 | const visitor = visitors[i];
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148 | const state = states[i];
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149 | explode(visitor);
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150 |
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151 | for (const type of Object.keys(visitor)) {
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152 | let visitorType = visitor[type];
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153 |
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154 | if (state || wrapper) {
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155 | visitorType = wrapWithStateOrWrapper(visitorType, state, wrapper);
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156 | }
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157 |
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158 | const nodeVisitor = rootVisitor[type] = rootVisitor[type] || {};
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159 | mergePair(nodeVisitor, visitorType);
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160 | }
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161 | }
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162 |
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163 | return rootVisitor;
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164 | }
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165 |
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166 | function wrapWithStateOrWrapper(oldVisitor, state, wrapper) {
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167 | const newVisitor = {};
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168 |
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169 | for (const key of Object.keys(oldVisitor)) {
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170 | let fns = oldVisitor[key];
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171 | if (!Array.isArray(fns)) continue;
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172 | fns = fns.map(function (fn) {
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173 | let newFn = fn;
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174 |
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175 | if (state) {
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176 | newFn = function (path) {
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177 | return fn.call(state, path, state);
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178 | };
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179 | }
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180 |
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181 | if (wrapper) {
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182 | newFn = wrapper(state.key, key, newFn);
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183 | }
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184 |
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185 | if (newFn !== fn) {
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186 | newFn.toString = () => fn.toString();
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187 | }
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188 |
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189 | return newFn;
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190 | });
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191 | newVisitor[key] = fns;
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192 | }
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193 |
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194 | return newVisitor;
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195 | }
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196 |
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197 | function ensureEntranceObjects(obj) {
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198 | for (const key of Object.keys(obj)) {
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199 | if (shouldIgnoreKey(key)) continue;
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200 | const fns = obj[key];
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201 |
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202 | if (typeof fns === "function") {
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203 | obj[key] = {
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204 | enter: fns
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205 | };
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206 | }
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207 | }
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208 | }
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209 |
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210 | function ensureCallbackArrays(obj) {
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211 | if (obj.enter && !Array.isArray(obj.enter)) obj.enter = [obj.enter];
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212 | if (obj.exit && !Array.isArray(obj.exit)) obj.exit = [obj.exit];
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213 | }
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214 |
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215 | function wrapCheck(wrapper, fn) {
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216 | const newFn = function (path) {
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217 | if (wrapper.checkPath(path)) {
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218 | return fn.apply(this, arguments);
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219 | }
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220 | };
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221 |
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222 | newFn.toString = () => fn.toString();
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223 |
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224 | return newFn;
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225 | }
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226 |
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227 | function shouldIgnoreKey(key) {
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228 | if (key[0] === "_") return true;
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229 | if (key === "enter" || key === "exit" || key === "shouldSkip") return true;
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230 |
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231 | if (key === "denylist" || key === "noScope" || key === "skipKeys" || key === "blacklist") {
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232 | return true;
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233 | }
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234 |
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235 | return false;
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236 | }
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237 |
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238 | function mergePair(dest, src) {
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239 | for (const key of Object.keys(src)) {
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240 | dest[key] = [].concat(dest[key] || [], src[key]);
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241 | }
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242 | } |
\ | No newline at end of file |