샘플
typescript 7.0.2: Compute source code line starts and map text positions using computeLineStarts
검증된 샘플 — npm typescript 7.0.2: Compute source code line starts and map text positions using computeLineStarts. node 22 · linux alpine/x64 · docker에서…
sha256:b31babca09bf9de0584f7f4edc5d7af3db347bfc2d06e19b56359d1290467626
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MIT-0
실행 증거
선언된 환경과 서명된 실행을 분리해 두었습니다. 이 샘플이 무엇을 어디서 실행했는지 그대로 볼 수 있습니다.
- 증거 기준
- 서명된 컨트랙트 통과
- 검증 영수증
- 1
- 빌드한 서명 키
- 1
선언된 환경
linux 24 · ubuntu · glibc 2.39 x64 npm
검증 실행 환경
| 환경 | 컨트랙트 | 단계 | 실행일 |
|---|---|---|---|
| node 22 · linux alpine/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · node-typescript@1 |
2026-08-20 |
케이스
HOW- 목표
- Compute source code line starts and map text positions using computeLineStarts
- 패키지
- 심벌
-
- computeLineStarts
- 생성일
- 2026-08-20T04:33:57Z
컨트랙트
- computeLineStarts calculates 0-indexed line start offsets for multiline source code
- computeLineStarts handles various newline delimiters including CRLF and LF
- getPositionLineAndCharacter maps character offsets to line and character positions
- extractLineText retrieves the exact line content for a given line index
파일
- PROMPT.md
- csx.json
- package-lock.json
- package.json
- spec.json
- src/index.mjs
- test/contract.mjs
소스
Clean-room public code sample — generation instructions
Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.
A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.
Goal: Compute source code line starts and map text positions using computeLineStarts
Kind: HOW
Use EXACTLY these public packages and versions:
- pkg:npm/typescript@7.0.2
Demonstrate these symbols/APIs:
- computeLineStarts
Rules:
- One focused purpose; the smallest project that proves the goal.
- Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
- Pin every dependency with a lockfile so resolution is reproducible.
- No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
- No personal names, emails, company names, or project identifiers of any kind.
- No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
- Keep it under 200 files and 256KB packed.
{"case":{"caseId":"case:sha256:0f9174ebdc725c11afa7af6102510a146d620e548a538c652e46dec7db1cae23","contract":["computeLineStarts calculates 0-indexed line start offsets for multiline source code","computeLineStarts handles various newline delimiters including CRLF and LF","getPositionLineAndCharacter maps character offsets to line and character positions","extractLineText retrieves the exact line content for a given line index"],"goal":"Compute source code line starts and map text positions using computeLineStarts","kind":"HOW","packages":["pkg:npm/typescript@7.0.2"],"schemaVersion":1,"symbols":["computeLineStarts"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"npm","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/typescript@7.0.2"],"schemaVersion":1,"symbols":["computeLineStarts"],"verifierAdapter":"node-typescript@1"}
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{
"name": "typescript-computelinestarts-sample",
"version": "1.0.0",
"description": "Compute source code line starts and map text positions using computeLineStarts",
"type": "module",
"main": "src/index.mjs",
"scripts": {
"test": "node test/contract.mjs"
},
"dependencies": {
"typescript": "7.0.2"
},
"license": "MIT-0"
}
{
"schemaVersion": 1,
"goal": "Compute source code line starts and map text positions using computeLineStarts",
"kind": "HOW",
"packages": [
"pkg:npm/typescript@7.0.2"
],
"symbols": [
"computeLineStarts"
]
}
import { computeLineStarts } from 'typescript/unstable/ast';
/**
* Computes the 0-indexed line start offsets for a given source code string.
*
* @param {string} text - Source code text.
* @returns {number[]} Array of 0-indexed character offsets where each line begins.
*/
export function getLineStarts(text) {
if (typeof text !== 'string') {
throw new TypeError('Expected text to be a string');
}
return computeLineStarts(text);
}
/**
* Maps a 0-indexed character position to a 0-indexed line and character (column) position.
*
* @param {readonly number[]} lineStarts - Line start offsets computed by computeLineStarts.
* @param {number} position - 0-indexed character offset in the source text.
* @returns {{ line: number, character: number }}
*/
export function getPositionLineAndCharacter(lineStarts, position) {
if (!Array.isArray(lineStarts) || lineStarts.length === 0) {
throw new Error('Invalid lineStarts array');
}
if (typeof position !== 'number' || position < 0) {
throw new Error('Position must be a non-negative number');
}
let low = 0;
let high = lineStarts.length - 1;
while (low <= high) {
const mid = Math.floor((low + high) / 2);
const start = lineStarts[mid];
if (start === position) {
return { line: mid, character: 0 };
} else if (start < position) {
low = mid + 1;
} else {
high = mid - 1;
}
}
const line = high >= 0 ? high : 0;
const character = position - lineStarts[line];
return { line, character };
}
/**
* Extracts the exact line content for a given 0-indexed line number.
*
* @param {string} sourceText - Full source text.
* @param {readonly number[]} lineStarts - Line start offsets.
* @param {number} lineIndex - 0-indexed line index.
* @returns {string} Text of the requested line.
*/
export function extractLineText(sourceText, lineStarts, lineIndex) {
if (lineIndex < 0 || lineIndex >= lineStarts.length) {
throw new RangeError(`Line index ${lineIndex} out of bounds`);
}
const start = lineStarts[lineIndex];
const end = lineIndex + 1 < lineStarts.length ? lineStarts[lineIndex + 1] : sourceText.length;
return sourceText.slice(start, end);
}
/**
* Returns the total line count for the source text.
*
* @param {readonly number[]} lineStarts - Line start offsets.
* @returns {number} Number of lines.
*/
export function getLineCount(lineStarts) {
return lineStarts.length;
}
export { computeLineStarts };
import assert from 'node:assert/strict';
import {
computeLineStarts,
getLineStarts,
getPositionLineAndCharacter,
extractLineText,
getLineCount,
} from '../src/index.mjs';
// Contract 1: computeLineStarts calculates 0-indexed line start offsets for multiline source code
{
const source = 'function greet(name: string): string {\n return `Hello, ${name}!`;\n}\n';
const lineStarts = computeLineStarts(source);
assert.ok(Array.isArray(lineStarts), 'Line starts must be an array');
assert.strictEqual(lineStarts[0], 0, 'First line starts at offset 0');
assert.strictEqual(lineStarts[1], 39, 'Second line starts after first newline');
assert.strictEqual(lineStarts[2], 67, 'Third line starts after second newline');
assert.strictEqual(lineStarts[3], 69, 'Fourth line starts after third newline');
assert.strictEqual(getLineCount(lineStarts), 4, 'Total line count should match array length');
}
// Contract 2: computeLineStarts handles various newline delimiters including CRLF and LF
{
const unixText = 'first\nsecond\nthird';
const unixStarts = computeLineStarts(unixText);
assert.deepStrictEqual(unixStarts, [0, 6, 13], 'Unix LF line starts match');
const winText = 'first\r\nsecond\r\nthird';
const winStarts = computeLineStarts(winText);
assert.deepStrictEqual(winStarts, [0, 7, 15], 'Windows CRLF line starts match');
const singleLine = 'hello world';
const singleStarts = computeLineStarts(singleLine);
assert.deepStrictEqual(singleStarts, [0], 'Single line without newline has start at 0');
const emptyText = '';
const emptyStarts = computeLineStarts(emptyText);
assert.deepStrictEqual(emptyStarts, [0], 'Empty text has one line start at 0');
}
// Contract 3: getPositionLineAndCharacter maps character offsets to line and character positions
{
const source = 'line zero\nline one\nline two';
const lineStarts = getLineStarts(source);
const pos0 = getPositionLineAndCharacter(lineStarts, 0);
assert.strictEqual(pos0.line, 0);
assert.strictEqual(pos0.character, 0);
const pos5 = getPositionLineAndCharacter(lineStarts, 5);
assert.strictEqual(pos5.line, 0);
assert.strictEqual(pos5.character, 5);
const pos10 = getPositionLineAndCharacter(lineStarts, 10);
assert.strictEqual(pos10.line, 1);
assert.strictEqual(pos10.character, 0);
const pos15 = getPositionLineAndCharacter(lineStarts, 15);
assert.strictEqual(pos15.line, 1);
assert.strictEqual(pos15.character, 5);
const pos19 = getPositionLineAndCharacter(lineStarts, 19);
assert.strictEqual(pos19.line, 2);
assert.strictEqual(pos19.character, 0);
}
// Contract 4: extractLineText retrieves the exact line content for a given line index
{
const source = 'const x: number = 42;\nconst y: string = "test";\nconsole.log(x, y);\n';
const lineStarts = getLineStarts(source);
const line0 = extractLineText(source, lineStarts, 0);
assert.strictEqual(line0, 'const x: number = 42;\n');
const line1 = extractLineText(source, lineStarts, 1);
assert.strictEqual(line1, 'const y: string = "test";\n');
const line2 = extractLineText(source, lineStarts, 2);
assert.strictEqual(line2, 'console.log(x, y);\n');
const line3 = extractLineText(source, lineStarts, 3);
assert.strictEqual(line3, '');
assert.throws(() => {
extractLineText(source, lineStarts, -1);
}, RangeError);
assert.throws(() => {
extractLineText(source, lineStarts, 99);
}, RangeError);
}
console.log('All pkg:npm/typescript@7.0.2 computeLineStarts contracts passed.');
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