feat: adds simple evaluator

1 files changed, 76 insertions, 0 deletions

diff --git a/tests/parser.spec.ts b/tests/parser.spec.ts
new file mode 100644
index 0000000..48c398c
--- /dev/null
+++ b/tests/parser.spec.ts
@@ -0,0 +1,76 @@
+import { Expr, parse } from '../src/parser'
+
+describe('parser', () => {
+  it('should parse function call', () => {
+    expect(parse('hello()')).toEqual([Expr.Call({ name: 'hello', args: [] })])
+    expect(parse('hello ( wow , foo ) ')).toEqual([
+      Expr.Call({
+        name: 'hello',
+        args: [Expr.Identifier('wow'), Expr.Identifier('foo')],
+      }),
+    ])
+    expect(parse('hello(wow,foo)')).toEqual([
+      Expr.Call({
+        name: 'hello',
+        args: [Expr.Identifier('wow'), Expr.Identifier('foo')],
+      }),
+    ])
+    expect(parse('hello(wow,foo, coolio)')).toEqual([
+      Expr.Call({
+        name: 'hello',
+        args: [
+          Expr.Identifier('wow'),
+          Expr.Identifier('foo'),
+          Expr.Identifier('coolio'),
+        ],
+      }),
+    ])
+    expect(parse('hello(wow)')).toEqual([
+      Expr.Call({ name: 'hello', args: [Expr.Identifier('wow')] }),
+    ])
+  })
+
+  it('should parse sequential function calls', () => {
+    expect(parse('hello(world) foo-doo(bar, baz)')).toEqual([
+      Expr.Call({
+        name: 'hello',
+        args: [Expr.Identifier('world')],
+      }),
+      Expr.Call({
+        name: 'foo-doo',
+        args: [Expr.Identifier('bar'), Expr.Identifier('baz')],
+      }),
+    ])
+  })
+
+  it('should parse string literal', () => {
+    expect(parse(`"hello world toodles \' nice single quote there"`)).toEqual([
+      Expr.LiteralString(`hello world toodles \' nice single quote there`),
+    ])
+
+    expect(parse(` 'hello world toodles \" nice double quote there' `)).toEqual(
+      [Expr.LiteralString(`hello world toodles \" nice double quote there`)]
+    )
+  })
+
+  it('should parse var identifiers', () => {
+    expect(parse(`var(--hello, 'default')`)).toEqual([
+      Expr.Call({
+        name: 'var',
+        args: [Expr.VarIdentifier('--hello'), Expr.LiteralString(`default`)],
+      }),
+    ])
+
+    expect(parse(`calc(var(--hello))`)).toEqual([
+      Expr.Call({
+        name: 'calc',
+        args: [
+          Expr.Call({
+            name: 'var',
+            args: [Expr.VarIdentifier('--hello')],
+          }),
+        ],
+      }),
+    ])
+  })
+})