Push current progress so I can work on my laptop.

packages/js/core/dist/document.cjs

@@ -1 +1 @@
-"use strict";Object.defineProperties(exports,{__esModule:{value:!0},[Symbol.toStringTag]:{value:"Module"}});const i=require("./parser.cjs");function f(r,c=" "){const e=i.createLineData("",c);let n=!1;async function o(t=-1){if(n)n=!1;else{const a=await r.next();if(a===null)return!1;e.line=a,i.parseLine(e)}return l()<=t?(n=!0,!1):!0}const l=()=>e.level,u=(t=e.offsetHead)=>e.line.slice(t),s=()=>e.line.slice(e.offsetHead,e.offsetTail);return{next:o,level:l,line:u,head:s,tail:()=>e.line.slice(e.offsetTail),match:t=>t===s()}}exports.useDocument=f;
+"use strict";Object.defineProperties(exports,{__esModule:{value:!0},[Symbol.toStringTag]:{value:"Module"}});const i=require("./parser.cjs");function f(r,c=" "){const e=i.createLineData("",c);let n=!1;async function o(t=-1){if(n)n=!1;else{const a=await r();if(a==null)return!1;e.line=a,i.parseLine(e)}return l()<=t?(n=!0,!1):!0}const l=()=>e.level,u=(t=e.offsetHead)=>e.line.slice(t),s=()=>e.line.slice(e.offsetHead,e.offsetTail);return{next:o,level:l,line:u,head:s,tail:()=>e.line.slice(e.offsetTail),match:t=>t===s()}}exports.useDocument=f;

packages/js/core/dist/document.js

@@ -6,8 +6,8 @@ function h(s, f = " ") {
     if (n)
       n = !1;
     else {
-      const i = await s.next();
-      if (i === null)
+      const i = await s();
+      if (i == null)
         return !1;
       e.line = i, r(e);
     }

packages/js/core/dist/parser.cjs

@@ -1 +1 @@
-"use strict";Object.defineProperties(exports,{__esModule:{value:!0},[Symbol.toStringTag]:{value:"Module"}});function t(e="",r=" "){return{line:e,indent:r,level:0,offsetHead:0,offsetTail:0}}function f(e){if(typeof e!="object"||!e||typeof e.level!="number")throw new Error("'lineData' must be an object with 'line' string, and 'type' and 'level' integer properties");if(typeof e.indent!="string"||e.indent.length===0||e.indent.length>1)throw new Error("'lineData.indent' must be a single-character string");if(typeof e.line!="string")throw new Error("'lineData.line' must be a string");let r=0;if(!e.line.length)e.level=e.level,e.offsetHead=0,e.offsetTail=0;else{for(;e.line[r]===e.indent&&r<=e.level+1;)++r;for(e.level=r,e.offsetHead=r,e.offsetTail=r;e.line[e.offsetTail]&&e.line[e.offsetTail]!==" ";)++e.offsetTail}return e}exports.createLineData=t;exports.parseLine=f;
+"use strict";Object.defineProperties(exports,{__esModule:{value:!0},[Symbol.toStringTag]:{value:"Module"}});function t(e="",r=" "){return{line:e,indent:r,level:0,offsetHead:0,offsetTail:0}}function f(e){if(typeof e!="object"||!e||typeof e.level!="number")throw new Error("'lineData' must be an object with string line and numeric level properties");if(typeof e.indent!="string"||e.indent.length===0||e.indent.length>1)throw new Error("'lineData.indent' must be a single-character string");if(typeof e.line!="string")throw new Error("'lineData.line' must be a string");let r=0;if(!e.line.length)e.level=e.level,e.offsetHead=0,e.offsetTail=0;else{for(;e.line[r]===e.indent&&r<=e.level+1;)++r;for(e.level=r,e.offsetHead=r,e.offsetTail=r;e.line[e.offsetTail]&&e.line[e.offsetTail]!==" ";)++e.offsetTail}return e}exports.createLineData=t;exports.parseLine=f;

packages/js/core/dist/parser.js

@@ -1,9 +1,9 @@
 function f(e = "", r = " ") {
   return { line: e, indent: r, level: 0, offsetHead: 0, offsetTail: 0 };
 }
-function t(e) {
+function o(e) {
   if (typeof e != "object" || !e || typeof e.level != "number")
-    throw new Error("'lineData' must be an object with 'line' string, and 'type' and 'level' integer properties");
+    throw new Error("'lineData' must be an object with string line and numeric level properties");
   if (typeof e.indent != "string" || e.indent.length === 0 || e.indent.length > 1)
     throw new Error("'lineData.indent' must be a single-character string");
   if (typeof e.line != "string")
@@ -21,5 +21,5 @@ function t(e) {
 }
 export {
   f as createLineData,
-  t as parseLine
+  o as parseLine
 };

packages/js/core/dist/readers/js-string.cjs

@@ -1,2 +1,2 @@
-"use strict";Object.defineProperties(exports,{__esModule:{value:!0},[Symbol.toStringTag]:{value:"Module"}});function i(r,n=0){const t=Array.isArray(r)?r:r.split(`
-`),e={index:n-1,next:()=>(e.index++,e.index>=t.length?null:t[e.index]),clone:l=>i(r,l==null?n:e.index)};return e}exports.createStringReader=i;
+"use strict";Object.defineProperties(exports,{__esModule:{value:!0},[Symbol.toStringTag]:{value:"Module"}});function n(r,e=0){const t=Array.isArray(r)?r:r.split(`
+`);return e--,()=>(e++,e>=t.length?null:t[e])}exports.createStringReader=n;

packages/js/core/dist/readers/js-string.js

@@ -1,12 +1,8 @@
-function l(e, r = 0) {
-  const t = Array.isArray(e) ? e : e.split(`
-`), n = {
-    index: r - 1,
-    next: () => (n.index++, n.index >= t.length ? null : t[n.index]),
-    clone: (i) => l(e, i == null ? r : n.index)
-  };
-  return n;
+function e(t, r = 0) {
+  const n = Array.isArray(t) ? t : t.split(`
+`);
+  return r--, () => (r++, r >= n.length ? null : n[r]);
 }
 export {
-  l as createStringReader
+  e as createStringReader
 };

packages/js/core/dist/readers/node-readline.cjs

@@ -1 +1 @@
-"use strict";Object.defineProperties(exports,{__esModule:{value:!0},[Symbol.toStringTag]:{value:"Module"}});const e={};function r(t){const a=e.createInterface({input:e.createReadStream(t,"utf-8")})[Symbol.asyncIterator]();return async()=>(await a.next()).value}exports.createReadlineReader=r;
+"use strict";Object.defineProperties(exports,{__esModule:{value:!0},[Symbol.toStringTag]:{value:"Module"}});const r=require("node:fs"),n=require("node:readline/promises"),t=e=>e&&typeof e=="object"&&"default"in e?e:{default:e},o=t(r),u=t(n);function d(e){const a=u.default.createInterface({input:o.default.createReadStream(e,"utf-8")})[Symbol.asyncIterator]();return async()=>(await a.next()).value}exports.createReadlineReader=d;

packages/js/core/dist/readers/node-readline.js

@@ -1,10 +1,11 @@
-const e = {};
-function n(t) {
-  const a = e.createInterface({
-    input: e.createReadStream(t, "utf-8")
+import r from "node:fs";
+import a from "node:readline/promises";
+function c(e) {
+  const t = a.createInterface({
+    input: r.createReadStream(e, "utf-8")
   })[Symbol.asyncIterator]();
-  return async () => (await a.next()).value;
+  return async () => (await t.next()).value;
 }
 export {
-  n as createReadlineReader
+  c as createReadlineReader
 };

packages/js/core/src/document.ts

@@ -20,9 +20,9 @@ export function useDocument (reader: Reader, indent: string = ' '): Document {
     if (repeat) repeat = false
     // Otherwise parse the line normally.
     else {
-      const line = await reader.next()
+      const line = await reader()
       // If there are no more lines, bail out.
-      if (line === null) return false
+      if (line == null) return false
 
       lineData.line = line
       parseLine(lineData)

packages/js/core/src/readers/js-string.ts

@@ -3,15 +3,11 @@ import type { Reader } from './reader'
 export function createStringReader(doc: string|string[], index = 0): Reader {
   const lines = Array.isArray(doc) ? doc : doc.split('\n')
 
-  const reader = {
-    index: index - 1,
-    next: () => {
-      reader.index++
-      if (reader.index >= lines.length) return null
-      return lines[reader.index]
-    },
-    clone: (startIndex?: number) => createStringReader(doc, startIndex == null ? index : reader.index)
-  }
+  index--;
 
-  return reader
+  return () => {
+    index++
+    if (index >= lines.length) return null
+    return lines[index]
+  }
 }

packages/js/core/src/readers/node-readline.ts

@@ -1,7 +1,8 @@
 import fs from 'node:fs'
 import readline from 'node:readline/promises'
+import type { Reader } from './reader'
 
-export function createReadlineReader(path: string): () => Promise<string|null> {
+export function createReadlineReader(path: string): Reader {
   const it = readline.createInterface({
     input: fs.createReadStream(path, 'utf-8'),
   })[Symbol.asyncIterator]()

packages/js/core/src/readers/reader.ts

@@ -1,5 +1 @@
-export type Reader = {
-  index: number,
-  next: () => string|null|Promise<string|null>,
-  clone: (startIndex?: number) => Reader
-}
+export type Reader = () => string|null|Promise<string|null>

packages/js/core/vite.config.js

@@ -12,6 +12,12 @@ export default defineConfig({
         'readers/js-string': 'src/readers/js-string.ts',
         'readers/node-readline': 'src/readers/node-readline.ts',
       }
+    },
+    rollupOptions: {
+      external: [
+        `node:fs`,
+        `node:readline/promises`
+      ]
     }
   }
 })