From 613edccd076ac60bfd08bcabc5a058af17700ba9 Mon Sep 17 00:00:00 2001
From: Attila Reterics <reterics.attila@gmail.com>
Date: Sat, 14 Oct 2023 10:35:19 +0200
Subject: [PATCH] Exported Parser to OOP Object

---
 src/constants.ts        |  8 ++++++++
 src/lejs.ts             | 26 +++-----------------------
 src/parsers/index.ts    | 21 +++++++++++++++++++++
 src/parsers/variable.ts | 15 +++++++++++++++
 src/types/parsers.ts    |  8 ++++++++
 5 files changed, 55 insertions(+), 23 deletions(-)
 create mode 100644 src/constants.ts
 create mode 100644 src/parsers/index.ts
 create mode 100644 src/parsers/variable.ts
 create mode 100644 src/types/parsers.ts

diff --git a/src/constants.ts b/src/constants.ts
new file mode 100644
index 0000000..ce0ef54
--- /dev/null
+++ b/src/constants.ts
@@ -0,0 +1,8 @@
+
+export const REGEXPS = {
+    variable: {
+        start: "{{",
+        end: "}}",
+        regexp: /{{\w*}}/g
+    }
+}
diff --git a/src/lejs.ts b/src/lejs.ts
index e8b36a0..d75c808 100644
--- a/src/lejs.ts
+++ b/src/lejs.ts
@@ -23,32 +23,12 @@
 'use strict';
 import * as fs from 'fs'
 import * as path from 'path'
+import Parser from "./parsers";
 
-const REGEXPS = {
-    variable: {
-        start: "{{",
-        end: "}}",
-        regexp: /{{\w*}}/g
-    }
-}
 
-
-/**
- *
- * @param {string} string
- * @param {object} data
- * @param {undefined|object} options
- * @returns {*}
- */
 export function render (string: string, data, options: object|undefined) {
-    const config = REGEXPS.variable;
-    return string.replaceAll(config.regexp, (substr) => {
-        const variable = substr.substring(config.start.length, substr.length - config.end.length);
-        if (data && data.hasOwnProperty(variable)) {
-            return data[variable];
-        }
-        return "";
-    });
+    const parser = new Parser({cache: false});
+    return parser.render(string, data);
 }
 
 export function renderFile (file: string, data: object|undefined, options: object|undefined) {
diff --git a/src/parsers/index.ts b/src/parsers/index.ts
new file mode 100644
index 0000000..36a01cc
--- /dev/null
+++ b/src/parsers/index.ts
@@ -0,0 +1,21 @@
+import {ParserOptions, ParserFunc} from "../types/parsers";
+import renderVariable from "./variable";
+
+class Parser {
+    private parsers: ParserFunc[]
+    private cache: boolean;
+    constructor(options: ParserOptions|undefined) {
+        this.parsers = [
+            renderVariable
+        ];
+        this.cache = !!(options && options.cache); // TODO: ROADMAP
+    }
+
+    render(string: string, data: (object | null)) {
+        return this.parsers.reduce((str, parser) => {
+            return parser(str, data);
+        }, string);
+    }
+}
+
+export default Parser;
\ No newline at end of file
diff --git a/src/parsers/variable.ts b/src/parsers/variable.ts
new file mode 100644
index 0000000..c3c84e0
--- /dev/null
+++ b/src/parsers/variable.ts
@@ -0,0 +1,15 @@
+import {REGEXPS} from "../constants";
+import {ParserFunc} from "../types/parsers";
+
+
+const renderVariable: ParserFunc = (string: string, data: object|null): string => {
+    const config = REGEXPS.variable;
+    return string.replaceAll(config.regexp, (substr) => {
+        const variable = substr.substring(config.start.length, substr.length - config.end.length);
+        if (data && data.hasOwnProperty(variable)) {
+            return data[variable];
+        }
+        return "";
+    });
+}
+export default renderVariable;
diff --git a/src/types/parsers.ts b/src/types/parsers.ts
new file mode 100644
index 0000000..8deeae5
--- /dev/null
+++ b/src/types/parsers.ts
@@ -0,0 +1,8 @@
+
+export interface ParserOptions {
+    cache?: boolean
+}
+
+export interface ParserFunc {
+    (string: string, data: (object | null)): string
+}
\ No newline at end of file