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105 lines
2.4 KiB
Go
105 lines
2.4 KiB
Go
// Copyright (c) 2026 Lark Technologies Pte. Ltd.
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// SPDX-License-Identifier: MIT
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package draft
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import (
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"strings"
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"testing"
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xhtml "golang.org/x/net/html"
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)
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func TestPlainTextFromHTML(t *testing.T) {
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tests := []struct {
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name string
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html string
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want string
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}{
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{
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name: "strips inline style tag",
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html: `<html><head><style>body{color:red}</style></head><body><p>Hello</p></body></html>`,
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want: "Hello",
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},
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{
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name: "strips script tag",
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html: `<html><body><p>Before</p><script>alert("xss")</script><p>After</p></body></html>`,
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want: "Before\nAfter",
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},
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{
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name: "strips noscript tag",
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html: `<html><body><p>Visible</p><noscript>Fallback text</noscript></body></html>`,
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want: "Visible",
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},
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{
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name: "strips head and title",
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html: `<html><head><title>Page Title</title></head><body>Content</body></html>`,
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want: "Content",
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},
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{
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name: "plain text passthrough",
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html: `<div>Line one</div><div>Line two</div>`,
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want: "Line one\nLine two",
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},
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{
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name: "mixed non-text and text tags",
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html: `<html><head><style>.a{}</style><link rel="stylesheet"/><meta charset="utf-8"/></head><body><div>Only this</div></body></html>`,
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want: "Only this",
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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got := plainTextFromHTML(tt.html)
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if got != tt.want {
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t.Errorf("plainTextFromHTML() = %q, want %q", got, tt.want)
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}
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})
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}
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}
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func TestPlainTextFromHTMLDeepNesting(t *testing.T) {
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// Build HTML with 10000 levels of nesting — would overflow the stack
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// with the old recursive implementation.
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const depth = 10_000
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var b strings.Builder
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for i := 0; i < depth; i++ {
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b.WriteString("<div>")
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}
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b.WriteString("deep")
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for i := 0; i < depth; i++ {
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b.WriteString("</div>")
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}
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got := plainTextFromHTML(b.String())
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if got != "deep" {
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t.Errorf("deep nesting: got %q, want %q", got, "deep")
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}
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}
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func TestIsHTMLNonTextTag(t *testing.T) {
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tests := []struct {
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tag string
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want bool
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}{
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{"script", true},
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{"style", true},
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{"head", true},
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{"meta", true},
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{"noscript", true},
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{"link", true},
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{"title", true},
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{"div", false},
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{"p", false},
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{"span", false},
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}
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for _, tt := range tests {
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t.Run(tt.tag, func(t *testing.T) {
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n := &xhtml.Node{Type: xhtml.ElementNode, Data: tt.tag}
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if got := isHTMLNonTextTag(n); got != tt.want {
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t.Errorf("isHTMLNonTextTag(%q) = %v, want %v", tt.tag, got, tt.want)
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}
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})
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}
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}
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