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TypeScript
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160import { TreeFragment, type SyntaxNode, type Tree } from "@lezer/common"import { parser } from "@lezer/python"import { JSONParser } from "@streamparser/json"type ToolCallAssembly = { id: string; function: { name: string; arguments: string } }import type { ToolIntent, ToolProgress } from "./events.js"
const clean = (text: string): string => text.replace(/[\p{Cc}\p{Cf}]/gu, " ").replace(/\s+/g, " ").trim().slice(0, 300)type Value = { kind: "string" | "path"; text: string }
/** Read syntax, never evaluate code. Unknown/dynamic paths deliberately stay generic. */export function pythonIntent(code: string, tree = parser.parse(code)): ToolIntent | undefined { const text = (node: SyntaxNode | null): string => node ? code.slice(node.from, node.to) : "" const bindings = new Map<string, Value>() const intents: ToolIntent[] = [] const args = (call: SyntaxNode): { positional: SyntaxNode[]; named: Map<string, SyntaxNode> } => { const positional: SyntaxNode[] = [] const named = new Map<string, SyntaxNode>() let group: SyntaxNode[] = [] const flush = (): void => { if (group.length === 1) positional.push(group[0]!) if (group.length === 3 && group[0]!.name === "VariableName" && text(group[1]!) === "=") named.set(text(group[0]!), group[2]!) group = [] } for (let node = call.getChild("ArgList")?.firstChild; node; node = node.nextSibling) { if ([",", ")"].includes(node.name)) flush() else if (node.name !== "(" && !node.type.isError) group.push(node) } flush() return { positional, named } } const value = (node: SyntaxNode | null | undefined): Value | undefined => { if (!node) return if (node.name === "VariableName") return bindings.get(text(node)) if (node.name === "String" && !node.firstChild) { // Only complete ordinary/raw literals. Escape sequences we cannot prove stay unknown. const match = /^([rR]?)(['"])([\s\S]*)\2$/.exec(text(node)) if (!match || (!match[1] && /\\[^\\'"]/.test(match[3]!))) return return { kind: "string", text: match[1] ? match[3]! : match[3]!.replace(/\\([\\'"])/g, "$1") } } if (node.name === "CallExpression" && ["Path", "pathlib.Path"].includes(text(node.firstChild))) { const path = value(args(node).positional[0]) if (path) return { kind: "path", text: path.text } } return } const add = (kind: ToolIntent["kind"], target?: Value): void => { const label = target && clean(target.text) if (label) intents.push({ kind, target: label }) } const visit = (node: SyntaxNode): void => { // Definitions/control flow do not establish that their body is about to run. if (["FunctionDefinition", "ClassDefinition", "IfStatement", "ForStatement", "WhileStatement", "LambdaExpression"].includes(node.name)) return if (node.name === "AssignStatement") { const name = node.firstChild if (name?.name === "VariableName") { const assigned = text(name.nextSibling) === "=" ? value(name.nextSibling?.nextSibling) : undefined if (assigned) bindings.set(text(name), assigned) else bindings.delete(text(name)) } } if (node.name === "CallExpression") { const callee = node.firstChild const name = text(callee) const { positional, named } = args(node) const first = value(positional[0] ?? named.get("path") ?? named.get("file")) if (name === "edit") add("edit", first) else if (name === "read") add("read", first) else if (name === "sh") add("run", value(positional[0] ?? named.get("command"))) else if (name === "open") { const mode = value(positional[1] ?? named.get("mode")) if (mode && /^[rwaxbt+]+$/.test(mode.text)) add(/[wax+]/.test(mode.text) ? "write" : "read", first) } else if (callee?.name === "MemberExpression") { const path = value(callee.firstChild) const method = text(callee.getChild("PropertyName")) if (path?.kind === "path") { if (["write_text", "write_bytes"].includes(method)) add("write", path) if (["read_text", "read_bytes"].includes(method)) add("read", path) if (method === "open") { const mode = value(positional[0] ?? named.get("mode")) if (mode && /^[rwaxbt+]+$/.test(mode.text)) add(/[wax+]/.test(mode.text) ? "write" : "read", path) } } } } for (let child = node.firstChild; child; child = child.nextSibling) visit(child) } for (let statement = tree.topNode.firstChild; statement; statement = statement.nextSibling) { if (statement.name === "Comment") continue intents.length = 0 visit(statement) } return intents.at(-1)}
/** Publish a bounded live code tail. The UI owns terminal-width paging. */export function createToolProgressReporter(publish: (progress: ToolProgress | null) => void): (call: ToolCallAssembly | null, phase: ToolProgress["phase"]) => void { let previous: ToolProgress | null = null let decoder: JSONParser | undefined let raw = "" let code = "" let invalid = false let parsedLength = -1 let tree: Tree | undefined const reset = (): void => { decoder = undefined raw = code = "" invalid = false parsedLength = -1 tree = undefined } return (call, phase) => { if (!call) { if (previous) publish(null) previous = null reset() return } const name = clean(call.function.name).slice(0, 100) if (!name) return const callId = call.id.slice(0, 200) const sameCall = previous?.callId === callId && previous.name === name const args = call.function.arguments const continued = sameCall && args.startsWith(raw) if (!continued) reset() if (name === "python" && !invalid && args.length > raw.length) { if (!decoder) { decoder = new JSONParser({ paths: ["$.code"], keepStack: false, emitPartialTokens: true, emitPartialValues: true }) decoder.onValue = ({ value }) => { if (typeof value === "string") code = value } decoder.onError = () => { invalid = true; code = "" } } decoder.write(args.slice(raw.length)) raw = args } let intent = continued ? previous?.intent : undefined // Follow later actions in the same cell, including after a large file body. // Reuse the completed syntax prefix; never parse a raw tail inside a string as Python. if (code.length !== parsedLength) { const fragments = tree && code.length >= parsedLength ? TreeFragment.applyChanges(TreeFragment.addTree(tree), [ { fromA: parsedLength, toA: parsedLength, fromB: parsedLength, toB: code.length }, ]) : [] try { tree = parser.parse(code, fragments) intent = pythonIntent(code, tree) } catch { tree = undefined; intent = undefined } parsedLength = code.length } let offset = Math.max(0, code.length - 512) // A tail must not start halfway through a UTF-16 surrogate pair. if (/[\uDC00-\uDFFF]/.test(code[offset] ?? "")) offset++ const preview = code.slice(offset).replace(/[\p{Cc}\p{Cf}]/gu, match => " ".repeat(match.length)) const next: ToolProgress = { callId, name, phase, ...(intent ? { intent } : {}), ...(phase === "generating" && preview ? { code: { offset, text: preview } } : {}), } if (JSON.stringify(next) !== JSON.stringify(previous)) publish(next) previous = next }}