phase15: update CLAUDE.md and sync with current progress

- Update phase indicator to Phase 15 (Self-Hosting)
- Update documentation links to Phase 15 resources
- Reflect completion of R1-R5 tasks and ongoing work
- Fix CURRENT_TASK.md location to root directory

Co-Authored-By: Claude <noreply@anthropic.com>

apps/ny-parser-nyash/README.md

@@ -0,0 +1,14 @@
+# Ny Parser (v0) — Minimal Nyash-made Parser
+
+- Scope: integers, + - * /, parentheses, and a single `return` statement.
+- Output: JSON IR v0 as documented in CURRENT_TASK.md (Program/Return/Int/Binary).
+
+Usage (Unix)
+- echo "return 1+2*3" | ./tools/ny_parser_run.sh
+
+Usage (Windows PowerShell)
+- Get-Content .\apps\ny-mir-samples\arithmetic.nyash | .\tools\ny_parser_run.ps1
+
+Notes
+- This is a minimal educational parser to bootstrap the self-host loop.
+- Errors print a JSON envelope: {"version":0,"kind":"Error",...}.

apps/ny-parser-nyash/main.nyash

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+// Entry: read stdin, parse with ParserV0, print JSON IR or error JSON
+
+include("./apps/ny-parser-nyash/parser_minimal.nyash")
+
+static box Main {
+  main(args) {
+    local console = new ConsoleBox()
+    // Read all stdin
+    local buf = ""
+    loop(true) {
+      local line = console.readLine()
+      if line == null { break }
+      buf = buf + line + "\n"
+    }
+    if buf == "" { buf = "return 0\n" }
+    local ir = ParserV0.parse_program(buf)
+    // If already an Error envelope, print as-is
+    local s = ir.as_any().toString()
+    if s.indexOf("\"kind\":\"Error\"") >= 0 {
+      console.log(s)
+      return 1
+    }
+    // Expect MapBox with Program; toJson available on MapBox
+    local json = ir.toJson()
+    console.log(json)
+    return 0
+  }
+}
+

apps/ny-parser-nyash/parser_minimal.nyash

@@ -0,0 +1,88 @@
+// Minimal recursive-descent parser for Ny v0 producing JSON IR v0 (MapBox)
+
+include("./apps/ny-parser-nyash/tokenizer.nyash")
+
+static box ParserV0 {
+    init { tokens, pos }
+
+    parse_program(input) {
+        me.tokens = Tokenizer.tokenize(input)
+        // Error passthrough
+        if me.tokens.as_any().toString().indexOf("\"kind\":\"Error\"") >= 0 {
+            return me.tokens
+        }
+        me.pos = 0
+        local stmt = me.parse_stmt()
+        if stmt.as_any().toString().indexOf("\"kind\":\"Error\"") >= 0 { return stmt }
+        local body = new ArrayBox(); body.push(stmt)
+        local prog = new MapBox(); prog.set("version", 0); prog.set("kind", "Program"); prog.set("body", body)
+        return prog
+    }
+
+    parse_stmt() {
+        local tok = me.peek()
+        if tok.get("type") == "RETURN" {
+            me.next()
+            local expr = me.parse_expr()
+            if expr.as_any().toString().indexOf("\"kind\":\"Error\"") >= 0 { return expr }
+            local ret = new MapBox(); ret.set("type", "Return"); ret.set("expr", expr)
+            return ret
+        }
+        return me.err("Expected 'return'")
+    }
+
+    parse_expr() {
+        local left = me.parse_term()
+        loop(true) {
+            local t = me.peek(); local ty = t.get("type")
+            if ty == "+" || ty == "-" {
+                me.next(); local right = me.parse_term()
+                left = me.bin(ty, left, right)
+            } else { break }
+        }
+        return left
+    }
+
+    parse_term() {
+        local left = me.parse_factor()
+        loop(true) {
+            local t = me.peek(); local ty = t.get("type")
+            if ty == "*" || ty == "/" {
+                me.next(); local right = me.parse_factor()
+                left = me.bin(ty, left, right)
+            } else { break }
+        }
+        return left
+    }
+
+    parse_factor() {
+        local t = me.peek(); local ty = t.get("type")
+        if ty == "INT" {
+            me.next();
+            local node = new MapBox(); node.set("type", "Int"); node.set("value", t.get("value"))
+            return node
+        }
+        if ty == "(" {
+            me.next();
+            local e = me.parse_expr()
+            local r = me.peek(); if r.get("type") != ")" { return me.err(") expected") } else { me.next() }
+            return e
+        }
+        return me.err("factor expected")
+    }
+
+    // helpers
+    peek() { return me.tokens.get(me.pos) }
+    next() { me.pos = me.pos + 1; return me.tokens.get(me.pos-1) }
+    bin(op, lhs, rhs) {
+        local m = new MapBox(); m.set("type", "Binary"); m.set("op", op); m.set("lhs", lhs); m.set("rhs", rhs); return m
+    }
+    err(msg) {
+        local err = new MapBox(); err.set("version", 0); err.set("kind", "Error")
+        local e = new MapBox(); e.set("message", msg)
+        local sp = new MapBox(); sp.set("start", me.pos); sp.set("end", me.pos)
+        e.set("span", sp); err.set("error", e)
+        return err
+    }
+}
+

apps/ny-parser-nyash/tokenizer.nyash

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+// Minimal tokenizer for Ny v0 (ints, + - * /, ( ), return)
+
+static box Tokenizer {
+    tokenize(input) {
+        local tokens = new ArrayBox()
+        local i = 0
+        local n = input.length()
+        // helper: skip whitespace
+        fn skip_ws() {
+            loop(i < n) {
+                local ch = input.substring(i, i+1)
+                if ch == " " || ch == "\t" || ch == "\r" || ch == "\n" { i = i + 1 } else { return }
+            }
+        }
+        // main loop
+        loop(i < n) {
+            skip_ws()
+            if i >= n { break }
+            local ch = input.substring(i, i+1)
+            if ch == "+" || ch == "-" || ch == "*" || ch == "/" || ch == "(" || ch == ")" {
+                local tok = new MapBox(); tok.set("type", ch)
+                tokens.push(tok); i = i + 1; continue
+            }
+            // keyword: return
+            if i + 6 <= n {
+                local kw = input.substring(i, i+6)
+                if kw == "return" {
+                    local t = new MapBox(); t.set("type", "RETURN")
+                    tokens.push(t); i = i + 6; continue
+                }
+            }
+            // integer literal
+            if ch >= "0" && ch <= "9" {
+                local j = i
+                loop(j < n) {
+                    local cj = input.substring(j, j+1)
+                    if cj >= "0" && cj <= "9" { j = j + 1 } else { break }
+                }
+                local num_str = input.substring(i, j)
+                local tnum = new MapBox(); tnum.set("type", "INT"); tnum.set("value", num_str)
+                tokens.push(tnum); i = j; continue
+            }
+            // unknown
+            local err = new MapBox(); err.set("version", 0); err.set("kind", "Error")
+            local e = new MapBox(); e.set("message", "Unknown token");
+            local sp = new MapBox(); sp.set("start", i); sp.set("end", i+1)
+            e.set("span", sp); err.set("error", e)
+            return err
+        }
+        // EOF
+        local eof = new MapBox(); eof.set("type", "EOF"); tokens.push(eof)
+        return tokens
+    }
+}
+