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import { canReusePendingBlock } from "./markdown-projection"
import { project, stream } from "./markdown-stream"
describe("markdown stream", () => {
test("heals incomplete emphasis while streaming", () => {
expect(stream("hello **world", true)).toEqual([{ raw: "hello **world", src: "hello **world**", mode: "live" }])
expect(stream("say `code", true)).toEqual([{ raw: "say `code", src: "say `code`", mode: "live" }])
})
test("keeps incomplete links non-clickable until they finish", () => {
expect(stream("see [docs](https://example.com/gu", true)).toEqual([
{ raw: "see [docs](https://example.com/gu", src: "see docs", mode: "live" },
])
})
test("splits an unfinished trailing code fence from stable content", () => {
expect(stream("before\n\n```ts\nconst x = 1", true)).toEqual([
{ raw: "before\n\n", src: "before\n\n", mode: "full" },
{ raw: "```ts\nconst x = 1", src: "const x = 1", mode: "code", language: "ts" },
])
})
test("fully parses a code fence once it closes", () => {
const text = "before\n\n```ts\nconst x = 1\n```"
expect(stream(text, true)).toEqual([
{ raw: "before\n\n", src: "before\n\n", mode: "full" },
{ raw: "```ts\nconst x = 1\n```", src: "const x = 1", mode: "code", language: "ts", complete: true },
])
})
test("keeps a completed code fence in worker-rendered code mode when prose follows", () => {
expect(stream("```ts\nconst x = 1\n```\n\nafter", true)).toEqual([
{ raw: "```ts\nconst x = 1\n```\n\n", src: "const x = 1", mode: "code", language: "ts", complete: true },
{ raw: "after", src: "after", mode: "live" },
])
})
test("freezes completed top-level blocks and only keeps the tail live", () => {
expect(stream("# Plan\n\nFinished paragraph.\n\n- live item", true)).toEqual([
{ raw: "# Plan\n\n", src: "# Plan\n\n", mode: "full" },
{ raw: "Finished paragraph.\n\n", src: "Finished paragraph.\n\n", mode: "full" },
{ raw: "- live item", src: "- live item", mode: "live" },
])
})
test("keeps a growing table together until a later block freezes it", () => {
expect(stream("| a | b |\n|---|---|\n| 1 | 2 |", true)).toEqual([
{ raw: "| a | b |\n|---|---|\n| 1 | 2 |", src: "| a | b |\n|---|---|\n| 1 | 2 |", mode: "live" },
])
})
test("reprojects non-prefix replacements from current content", () => {
expect(stream("# Replacement\n\nNew body", true)).toEqual([
{ raw: "# Replacement\n\n", src: "# Replacement\n\n", mode: "full" },
{ raw: "New body", src: "New body", mode: "live" },
])
})
test("reprojects truncation without retaining removed blocks", () => {
expect(stream("Only the restored prefix", true)).toEqual([
{ raw: "Only the restored prefix", src: "Only the restored prefix", mode: "live" },
])
})
test("shifts later blocks when an earlier block is inserted", () => {
expect(stream("# Inserted\n\nFirst body\n\nSecond body", true)).toEqual([
{ raw: "# Inserted\n\n", src: "# Inserted\n\n", mode: "full" },
{ raw: "First body\n\n", src: "First body\n\n", mode: "full" },
{ raw: "Second body", src: "Second body", mode: "live" },
])
})
test("keeps reference-style markdown as one block", () => {
expect(stream("[docs][1]\n\n[1]: https://example.com", true)).toEqual([
{
raw: "[docs][1]\n\n[1]: https://example.com",
src: "[docs][1]\n\n[1]: https://example.com",
mode: "live",
},
])
})
test("keeps compact and indented reference definitions with their uses", () => {
expect(stream("[docs]\n\n [docs]:/guide", true)).toEqual([
{
raw: "[docs]\n\n [docs]:/guide",
src: "[docs]\n\n [docs]:/guide",
mode: "live",
},
])
})
test("keeps multiline reference definitions with their uses", () => {
expect(stream("[docs][id]\n\n[id]:\n /guide", true)).toEqual([
{
raw: "[docs][id]\n\n[id]:\n /guide",
src: "[docs][id]\n\n[id]:\n /guide",
mode: "live",
},
])
})
test("uses only the language portion of fence metadata", () => {
expect(stream("```ts title=example\nconst x = 1", true)).toEqual([
{
raw: "```ts title=example\nconst x = 1",
src: "const x = 1",
mode: "code",
language: "ts",
},
])
})
test("preserves trailing newlines in open code fences", () => {
expect(stream("```ts\nconst x = 1\n", true)).toEqual([
{
raw: "```ts\nconst x = 1\n",
src: "const x = 1\n",
mode: "code",
language: "ts",
},
])
})
test("only reuses pending blocks with compatible identity and content", () => {
expect(
canReusePendingBlock({ mode: "full", raw: "First\n\n" }, { mode: "full", raw: "# Inserted\n\n", src: "" }),
).toBe(false)
expect(
canReusePendingBlock({ mode: "code", raw: "```ts\none" }, { mode: "code", raw: "```ts\none two", src: "" }),
).toBe(true)
expect(canReusePendingBlock({ mode: "live", raw: "partial" }, { mode: "live", raw: "partial text", src: "" })).toBe(
true,
)
expect(canReusePendingBlock({ mode: "code", raw: "```ts\none" }, { mode: "live", raw: "one", src: "" })).toBe(false)
})
test("appends plain code deltas without reprojecting frozen blocks", () => {
const previous = project(undefined, "# Plan\n\n```ts\nconst one = 1\n", true)
const next = project(previous, `${previous.text}const two = 2\n`, true)
expect(next.blocks[0]).toBe(previous.blocks[0])
expect(next.blocks.at(-1)).toEqual({
raw: "```ts\nconst one = 1\nconst two = 2\n",
src: "const one = 1\nconst two = 2\n",
mode: "code",
language: "ts",
})
})
test("finalizes only the live tail when streaming stops", () => {
const live = project(undefined, "# Plan\n\nFinished paragraph.\n\n- final item", true)
const final = project(live, live.text, false)
expect(final.blocks[0]).toBe(live.blocks[0])
expect(final.blocks[1]).toBe(live.blocks[1])
expect(final.blocks[2]).toEqual({ raw: "- final item", src: "- final item", mode: "full" })
})
test("catches up paced text before finalizing", () => {
const live = project(undefined, "# Plan\n\nFinished paragraph.\n\n- final", true)
const final = project(live, `${live.text} item`, false)
expect(canReusePendingBlock(live.blocks[0], final.blocks[0]!)).toBe(true)
expect(canReusePendingBlock(live.blocks[1], final.blocks[1]!)).toBe(true)
expect(final.blocks[2]).toEqual({ raw: "- final item", src: "- final item", mode: "full" })
})
test("completes an open code block when streaming stops", () => {
const live = project(undefined, "```ts\nconst value = 1", true)
const final = project(live, live.text, false)
expect(final.blocks).toEqual([
{
raw: "```ts\nconst value = 1",
src: "const value = 1",
mode: "code",
language: "ts",
complete: true,
},
])
})
test("does not add a blank line before the first streamed code", () => {
const previous = project(undefined, "```ts\n", true)
const next = project(previous, `${previous.text}const x = 1`, true)
expect(next.blocks.at(-1)).toEqual({
raw: "```ts\nconst x = 1",
src: "const x = 1",
mode: "code",
language: "ts",
})
})
test("closes code fences split across provider deltas", () => {
const open = project(undefined, "```ts\nconst x = 1\n", true)
const one = project(open, `${open.text}\``, true)
const two = project(one, `${one.text}\``, true)
const closed = project(two, `${two.text}\``, true)
const prose = project(closed, `${closed.text}\nafter`, true)
expect(closed.blocks.at(-1)).toEqual({
raw: "```ts\nconst x = 1\n```",
src: "const x = 1",
mode: "code",
language: "ts",
complete: true,
})
expect(prose.blocks).toEqual([
{ raw: "```ts\nconst x = 1\n```\n", src: "const x = 1", mode: "code", language: "ts", complete: true },
{ raw: "after", src: "after", mode: "live" },
])
})
test("closes tilde fences split across provider deltas", () => {
const open = project(undefined, "~~~ts\nconst x = 1\n", true)
const one = project(open, `${open.text}~`, true)
const two = project(one, `${one.text}~`, true)
const closed = project(two, `${two.text}~`, true)
expect(closed.blocks.at(-1)).toEqual({
raw: "~~~ts\nconst x = 1\n~~~",
src: "const x = 1",
mode: "code",
language: "ts",
complete: true,
})
})
})
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