40 lines
1.2 KiB
TypeScript
40 lines
1.2 KiB
TypeScript
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import ist from "ist"
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import {EditorState} from "@codemirror/next/state"
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import {javascriptSyntax} from "@codemirror/next/lang-javascript"
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import {Tree} from "lezer"
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function s(doc: string) {
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return EditorState.create({doc, extensions: [javascriptSyntax.extension]})
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}
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function tr(state: EditorState) {
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return javascriptSyntax.ensureTree(state, state.doc.length, 1e9)!
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}
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describe("javascript syntax queries", () => {
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it("returns a tree", () => {
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let state = s("let state = s()"), tree = tr(state)
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ist(tree instanceof Tree)
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ist(tree.name, "Script")
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ist(tree.length, state.doc.length)
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let def = tree.resolve(6)
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ist(def.name, "VariableDefinition")
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ist(def.start, 4)
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ist(def.end, 9)
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})
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it("keeps the tree up to date through changes", () => {
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let state = s("if (2)\n x")
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ist(tr(state).childAfter(0)!.name, "IfStatement")
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state = state.t().replace(0, 3, "fac").apply()
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ist(tr(state).childAfter(0)!.name, "ExpressionStatement")
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})
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it("reuses nodes when parsing big documents", () => {
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let state = s("'hello';\n" + "blah;\n".repeat(3000))
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let buf = (tr(state).resolve(2) as any).buffer
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state = state.t().replace(2000, 2020, "xyz").apply()
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ist((tr(state).resolve(2) as any).buffer, buf)
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})
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})
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