1 | import * as ts from 'typescript';
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2 |
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3 | export interface ParsedNode {
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4 | kind: ts.SyntaxKind
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5 | _kind: string
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6 | name?: string
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7 | value?: any
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8 | body?: ParsedNode[]
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9 | }
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10 |
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11 | function walk(sourceFile: ts.SourceFile): ParsedNode[] {
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12 |
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13 | const stack : Array<ParsedNode> = [];
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14 | const elementStack : Array<ParsedNode> = [];
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15 |
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16 | function push(element) {
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17 | const parent = elementStack[elementStack.length - 1];
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18 | const siblings = (parent && parent.body) ? parent.body : stack;
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19 | siblings.push(element);
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20 | }
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21 |
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22 | eachProp(sourceFile);
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23 |
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24 | return stack;
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25 |
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26 | function addFromArrayElement(incoming) {
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27 | switch(incoming.kind) {
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28 | case ts.SyntaxKind.NullKeyword:
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29 | case ts.SyntaxKind.TrueKeyword:
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30 | case ts.SyntaxKind.FalseKeyword:
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31 | case ts.SyntaxKind.NumericLiteral:
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32 | case ts.SyntaxKind.StringLiteral: {
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33 | push(literalTypeFromArrayElement(incoming, incoming.kind));
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34 | break;
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35 | }
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36 | case ts.SyntaxKind.ObjectLiteralExpression: {
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37 | const elem = {
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38 | kind: ts.SyntaxKind.ObjectLiteralExpression,
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39 | _kind: `ObjectLiteralExpression`,
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40 | body: [],
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41 | };
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42 | push(elem);
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43 | elementStack.push(elem);
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44 | eachProp(incoming.properties);
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45 | elementStack.pop();
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46 | break;
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47 | }
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48 | case ts.SyntaxKind.ArrayLiteralExpression: {
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49 | const elem = {
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50 | kind: ts.SyntaxKind.ArrayLiteralExpression,
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51 | _kind: `ArrayLiteralExpression`,
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52 | body: [],
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53 | };
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54 | push(elem);
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55 | elementStack.push(elem);
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56 | eachProp(incoming.elements);
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57 | elementStack.pop();
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58 | break;
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59 | }
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60 | }
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61 | }
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62 |
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63 | function eachProp(properties) {
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64 | properties.forEach(function (prop) {
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65 | if (!prop.initializer) {
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66 | return addFromArrayElement(prop);
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67 | } else {
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68 | switch (prop.initializer.kind) {
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69 | case ts.SyntaxKind.TrueKeyword:
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70 | case ts.SyntaxKind.FalseKeyword:
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71 | case ts.SyntaxKind.NullKeyword:
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72 | case ts.SyntaxKind.StringLiteral:
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73 | case ts.SyntaxKind.NumericLiteral: {
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74 | push(literalTypeFromProp(prop, prop.initializer.kind));
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75 | break;
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76 | }
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77 | case ts.SyntaxKind.PrefixUnaryExpression: {
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78 | push(literalTypeFromProp(prop, ts.SyntaxKind.NumericLiteral));
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79 | break;
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80 | }
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81 | case ts.SyntaxKind.ObjectLiteralExpression: {
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82 |
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83 | const elem = {
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84 | name: prop.name.text,
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85 | body: [],
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86 | kind: ts.SyntaxKind.ObjectLiteralExpression,
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87 | _kind: `ObjectLiteralExpression`
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88 | };
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89 | push(elem);
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90 | elementStack.push(elem);
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91 | eachProp(prop.initializer.properties);
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92 | elementStack.pop();
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93 | break;
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94 | }
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95 | case ts.SyntaxKind.ArrayLiteralExpression: {
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96 | const elem = {
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97 | name: prop.name.text,
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98 | body: [],
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99 | kind: ts.SyntaxKind.ArrayLiteralExpression,
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100 | _kind: `ArrayLiteralExpression`
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101 | };
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102 | push(elem);
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103 | elementStack.push(elem);
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104 | eachProp(prop.initializer.elements);
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105 | elementStack.pop();
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106 | break;
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107 | }
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108 | }
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109 | }
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110 | });
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111 | }
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112 |
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113 | function literalTypeFromProp(prop, kind) {
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114 | return {
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115 | name: prop.name.text,
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116 | value: prop.initializer.text,
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117 | kind: kind,
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118 | }
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119 | }
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120 |
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121 | function literalTypeFromArrayElement(element, kind) {
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122 | return {
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123 | kind,
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124 | name: element.text,
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125 | value: element.text,
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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 | export function parse(string): any[] {
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131 | const input = `const ROOTOBJ = ${string}`;
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132 | let sourceFile : ts.SourceFile = ts.createSourceFile('json.ts', input, ts.ScriptTarget.ES2015, true);
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133 |
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134 | const _json = sourceFile.statements[0] as any;
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135 |
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136 |
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137 | const stack = walk(_json.declarationList.declarations[0].initializer.properties);
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138 | return stack;
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139 | }
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