close enough for a parse fix

src/util/gin.ts

@@ -1,17 +1,3 @@
-
-const example =
-`Dear {{.Name}},
-{{if .Attended}}
-It was a pleasure to see you at the wedding.
-{{- else}}
-It is a shame you couldn't make it to the wedding.
-{{- end}}
-{{with .Gift -}}
-Thank you for the lovely {{.}}.
-{{end}}
-Best wishes,
-Josie`;
-
 type Node = {
     type: 'Text' | 'Data' | 'Conditional' | 'Marker' | 'Container' | 'Empty'
     
@@ -39,13 +25,11 @@ type Node = {
     parent?: Node;
 };
 
-function parse(text: string): Node {
-     let root: Node = {
-        type: 'Container',
-        placeholders: []
-    };
-    return _parse(text, root);
-}
+type Template = {
+    name: string;
+    root: Node;
+};
+
 
 function _parse(text: string, root: Node): Node {
      if (!text || text.length < 1) {
@@ -130,7 +114,7 @@ function _parse(text: string, root: Node): Node {
 
     if (textNode.startIndex! < textNode.endIndex!) {
         textNode.parent = scope;
-        textNode.text = text.substring(textNode.startIndex!, textNode.endIndex!)
+        textNode.text = text.substring(textNode.startIndex!, textNode.endIndex! + 1)
         scope.placeholders!.push(textNode);
     }
 
@@ -223,7 +207,65 @@ function parseDataText(text: string): Node {
     };
 }
 
-function printNode(node: Node, offset='') {
+function _execute(node: Node, data: Record<string, any> | string, build: string): string {
+    if (!node) {
+        return build;
+    }
+
+    switch (node.type) {
+        case 'Container':
+            return build + node.placeholders!.map(p => _execute(p, data, '')).join('');
+        case 'Conditional':
+            const condEval = _execute(node.condition!, data, '');
+            let value = condEval;
+            try {
+                value = JSON.parse(value);
+            } catch (e) {}
+            if (node.conditionType == 'if') {
+                // BREH JS BS (without the parenthesis it includes build in its ternary condition -.-)
+                return build + (!!value ?
+                    _execute(node.consequent!, data, '') :
+                    _execute(node.alternative!, data, ''))
+            } else {
+                // BREH JS BS
+                return build + (!!value ?
+                    _execute(node.consequent!, value, '') :
+                    _execute(node.alternative!, value, ''))
+            }
+        case 'Data':
+            if (node.key == ".") {
+                if (typeof data === 'string') {
+                    return build + data
+                } else {
+                    return build + JSON.stringify(data);
+                }
+            } else {
+                if (typeof data === 'object') {
+                    const inner = data[node.key!.substring(1)]
+                    if (typeof inner === 'string') {
+                        return build + inner
+                    }
+                    return build + JSON.stringify(inner);
+                }
+                throw new Error('huh?')
+            }
+        case 'Text':
+            return node.text!;
+        default:
+            return build + '[NOT_IMPLEMENTED]'
+    }
+}
+
+export namespace Gin {
+    export function parse(text: string): Node {
+        let root: Node = {
+            type: 'Container',
+            placeholders: []
+        };
+        return _parse(text, root);
+    };
+
+    export function printNode(node: Node, offset='') {
         switch (node.type) {
             case 'Conditional':
                 console.log(`${offset}${node.conditionType}`);
@@ -249,9 +291,13 @@ function printNode(node: Node, offset='') {
             default:
                 console.log(`${offset}${node.type}`);
         }
-}
+    }
+
+    export function execute(template: Template, data: Record<string, any>) {
+        return _execute(template.root, data, '');   
+    }
+};
 
-printNode(parse(example));
 /**
  * Stopgap :(
  */

test/util/gin.test.ts

@@ -0,0 +1,81 @@
+import { describe, it, expect } from 'bun:test'
+import { Gin } from '../../src/util/gin'
+
+describe('Gin template porting test', () => {
+     it('parse', async () => {
+        const example =
+            `Dear {{.Name}},
+{{if .Attended}}
+It was a pleasure to see you at the wedding.
+{{- else}}
+It is a shame you couldn't make it to the wedding.
+{{- end}}
+{{with .Gift -}}
+Thank you for the lovely {{.}}.
+{{end}}
+Best wishes,
+Josie`;
+
+        const template = {
+            name: 'example',
+            root: Gin.parse(example)
+        };
+
+        const data = [
+            {
+                Name: 'Aunt Mildred',
+                Gift: 'bone china tea set',
+                Attended: true,
+            },
+            {
+                Name: 'Uncle John',
+                Gift: 'moleskin pants',
+                Attended: false,
+            },
+            {
+                Name: 'Cousin Rodney',
+                Gift: '',
+                Attended: false,
+            },
+        ]
+
+        const expected = 
+            `Dear Aunt Mildred,
+
+It was a pleasure to see you at the wedding.
+Thank you for the lovely bone china tea set.
+
+Best wishes,
+Josie
+
+Dear Uncle John,
+
+It is a shame you couldn't make it to the wedding.
+Thank you for the lovely moleskin pants.
+
+Best wishes,
+Josie
+
+Dear Cousin Rodney,
+
+It is a shame you couldn't make it to the wedding.
+
+Best wishes,
+Josie`
+
+        const actual = data.map(r => Gin.execute(template, r)).join('\n');
+        console.log(actual)
+        expect(actual).toEqual(expected);
+    })
+
+    // it('parseGlob', async () => {
+    //     const gin = new Gin();
+    //     const paths = await gin.parseGlob('public/**/*html');
+    // })
+
+    // it('parseHTML', async () => {
+    //     const gin = new Gin();
+    //     const text = await gin.parseHTML('public/pages/movie.html');
+    //     console.log(text);
+    // })
+})