feat: implement math expression parser

plugin/gomark/parser/math_block_test.go

@@ -0,0 +1,30 @@
+package parser
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/usememos/memos/plugin/gomark/ast"
+	"github.com/usememos/memos/plugin/gomark/parser/tokenizer"
+	"github.com/usememos/memos/plugin/gomark/restore"
+)
+
+func TestMathBlockParser(t *testing.T) {
+	tests := []struct {
+		text string
+		link ast.Node
+	}{
+		{
+			text: "$$\n(1+x)^2\n$$",
+			link: &ast.MathBlock{
+				Content: "(1+x)^2",
+			},
+		},
+	}
+	for _, test := range tests {
+		tokens := tokenizer.Tokenize(test.text)
+		node, _ := NewMathBlockParser().Parse(tokens)
+		require.Equal(t, restore.Restore([]ast.Node{test.link}), restore.Restore([]ast.Node{node}))
+	}
+}