filter parse - ts

packages/filterparser/.gitignore

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+lib

packages/filterparser/package.json

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+{
+  "version": "0.1.0",
+  "name": "@dbgate/filterparser",
+  "main": "lib/index.js",
+  "typings": "lib/index.d.ts",
+  "scripts": {
+    "prepare": "yarn build",
+    "build": "tsc",
+    "start": "tsc --watch",
+    "test": "jest"
+  },
+  "files": [
+    "lib"
+  ],
+  "devDependencies": {
+    "@dbgate/types": "^0.1.0",
+    "@types/node": "^13.7.0",
+    "typescript": "^3.7.5"
+  },
+  "dependencies": {
+    "@types/parsimmon": "^1.10.1",
+    "lodash": "^4.17.15",
+    "parsimmon": "^1.13.0"
+  }
+}

packages/filterparser/src/parseFilter.ts

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+import P from 'parsimmon';
+import { FilterType } from './types';
+
+const whitespace = P.regexp(/\s*/m);
+
+function token(parser) {
+  return parser.skip(whitespace);
+}
+
+function interpretEscapes(str) {
+  let escapes = {
+    b: '\b',
+    f: '\f',
+    n: '\n',
+    r: '\r',
+    t: '\t',
+  };
+  return str.replace(/\\(u[0-9a-fA-F]{4}|[^u])/, (_, escape) => {
+    let type = escape.charAt(0);
+    let hex = escape.slice(1);
+    if (type === 'u') {
+      return String.fromCharCode(parseInt(hex, 16));
+    }
+    if (escapes.hasOwnProperty(type)) {
+      return escapes[type];
+    }
+    return type;
+  });
+}
+
+const parser = P.createLanguage({
+  expr: r => P.alt(r.string),
+
+  string: () =>
+    token(P.regexp(/"((?:\\.|.)*?)"/, 1))
+      .map(interpretEscapes)
+      .desc('string'),
+});
+
+export function parseFilter(value: string, filterType: FilterType) {
+  const ast = parser.expr.tryParse(value);
+  console.log(ast);
+  return ast;
+}

packages/filterparser/src/parserFilter.test.ts

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+import parserFilter, { parseFilter } from './parseFilter';
+
+test('parse string', parseFilter('"123"', 'string'));

packages/filterparser/src/types.ts

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+// import types from '@dbgate/types';
+
+export type FilterType = 'number' | 'string' | 'datetime' | 'logical';

packages/filterparser/tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "ES2015",
+    "module": "commonjs",
+    "declaration": true,
+    "skipLibCheck": true,
+    "outDir": "lib",
+    "preserveWatchOutput": true,
+    "esModuleInterop": true
+  },
+  "include": [
+    "src/**/*"
+  ]
+}