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import {parser} from "../dist/index.js"
import {fileTests} from "@lezer/generator/dist/test"
import {Tree, TreeFragment} from "@lezer/common"
describe("Incremental parsing", () => {
// See https://github.com/codemirror/codemirror.next/issues/394
it("doesn't reuse statements in the wrong body", () => {
let input = `class StreamWriter:
def __init__(self):
pass
def a():
pass
def b(self):
""" ${"big block comment to fill up the reuse size quota\n ".repeat(150)} """
pass
`
let ast = parser.parse(input)
let at = input.indexOf("pass")
input = input.slice(0, at) + " " + input.slice(at)
let cache = TreeFragment.applyChanges(TreeFragment.addTree(ast), [{fromA: at, toA: at, fromB: at, toB: at + 1}])
let ast2 = parser.parse(input, cache)
if (ast2.toString() != ast.toString()) throw new Error("Malformed tree")
let lastFunc = ast => {
let cur = ast.cursor(ast.length)
while (cur.type.name != "FunctionDefinition") cur.prev()
return cur.tree
}
if (lastFunc(ast) != lastFunc(ast2)) throw new Error("No reuse")
})
})
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