// Mini-VM: function-based entry using library using selfhost.vm.json_cur as MiniJsonCur using selfhost.vm.json as MiniJson using selfhost.vm.core as MiniVm // Local static box (duplicated from mini_vm_lib for now to avoid include gate issues) // Program entry: prefer argv[0] JSON, fallback to embedded sample static box Main { // Small helpers for quick JSON scans (avoid cross-box deps) index_of_from(hay, needle, pos) { local tail = hay.substring(pos, hay.length()) local rel = tail.indexOf(needle) if rel < 0 { return -1 } else { return pos + rel } } _is_digit(ch) { if ch == "0" { return 1 } if ch == "1" { return 1 } if ch == "2" { return 1 } if ch == "3" { return 1 } if ch == "4" { return 1 } if ch == "5" { return 1 } if ch == "6" { return 1 } if ch == "7" { return 1 } if ch == "8" { return 1 } if ch == "9" { return 1 } return 0 } _digit_value(ch) { if ch == "0" { return 0 } if ch == "1" { return 1 } if ch == "2" { return 2 } if ch == "3" { return 3 } if ch == "4" { return 4 } if ch == "5" { return 5 } if ch == "6" { return 6 } if ch == "7" { return 7 } if ch == "8" { return 8 } if ch == "9" { return 9 } return 0 } _str_to_int(s) { local i = 0 local n = s.length() local acc = 0 loop (i < n) { local ch = s.substring(i, i+1) if ch == "0" { acc = acc * 10 + 0 i = i + 1 continue } if ch == "1" { acc = acc * 10 + 1 i = i + 1 continue } if ch == "2" { acc = acc * 10 + 2 i = i + 1 continue } if ch == "3" { acc = acc * 10 + 3 i = i + 1 continue } if ch == "4" { acc = acc * 10 + 4 i = i + 1 continue } if ch == "5" { acc = acc * 10 + 5 i = i + 1 continue } if ch == "6" { acc = acc * 10 + 6 i = i + 1 continue } if ch == "7" { acc = acc * 10 + 7 i = i + 1 continue } if ch == "8" { acc = acc * 10 + 8 i = i + 1 continue } if ch == "9" { acc = acc * 10 + 9 i = i + 1 continue } break } return acc } main(args) { local json = "{\"kind\":\"Program\",\"statements\":[{\"kind\":\"Print\",\"expression\":{\"kind\":\"Literal\",\"value\":{\"type\":\"int\",\"value\":42}}}]}" // If args provided, use the first as JSON source (guard None) if args { if args.size() > 0 { local s = args.get(0) if s { json = s } } } // Top-level fast paths for simple Print cases (Literal/FunctionCall/Compare/BinaryOp) // 0) If(literal int) then/else branch (string prints) if json.indexOf("\"If\"") >= 0 { local kc = "\"condition\"" local pc = json.indexOf(kc) if pc >= 0 { local kv = "\"type\":\"int\",\"value\":" local pv = json.indexOf(kv, pc) if pv >= 0 { local vi = pv + kv.length() local ve = json.indexOf("}", vi) if ve >= 0 { local cond_str = json.substring(vi, ve) // parse int local a = 0 local i = 0 loop (i < cond_str.length()) { local ch = cond_str.substring(i, i+1) if ch == "0" { a = a*10 i = i + 1 continue } if ch == "1" { a = a*10+1 i = i + 1 continue } if ch == "2" { a = a*10+2 i = i + 1 continue } if ch == "3" { a = a*10+3 i = i + 1 continue } if ch == "4" { a = a*10+4 i = i + 1 continue } if ch == "5" { a = a*10+5 i = i + 1 continue } if ch == "6" { a = a*10+6 i = i + 1 continue } if ch == "7" { a = a*10+7 i = i + 1 continue } if ch == "8" { a = a*10+8 i = i + 1 continue } if ch == "9" { a = a*10+9 i = i + 1 continue } break } local truthy = 0 if a != 0 { truthy = 1 } local bkey = "\"then_body\"" if truthy == 0 { bkey = "\"else_body\"" } local pb = json.indexOf(bkey, ve) if pb >= 0 { // search first string literal value inside the chosen body local ts = "\"type\":\"string\",\"value\":\"" local ps = json.indexOf(ts, pb) if ps >= 0 { local si = ps + ts.length() local sj = json.indexOf("\"", si) if sj >= 0 { print(json.substring(si, sj)) return 0 } } } } } } } // 1) Print(Literal string) if json.indexOf("\"expression\":{\"kind\":\"Literal\",\"value\":{\"type\":\"string\"") >= 0 { local ks = "\"expression\":{\"kind\":\"Literal\",\"value\":{\"type\":\"string\",\"value\":\"" local ps = json.indexOf(ks) if ps >= 0 { local si = ps + ks.length() local sj = json.indexOf("\"", si) if sj >= 0 { print(json.substring(si, sj)) return 0 } } } // 2) Print(Literal int) if json.indexOf("\"expression\":{\"kind\":\"Literal\",\"value\":{\"type\":\"int\"") >= 0 { local ki = "\"expression\":{\"kind\":\"Literal\",\"value\":{\"type\":\"int\",\"value\":" local pi = json.indexOf(ki) if pi >= 0 { local ii = pi + ki.length() // take until next non-digit or closing brace local ie = json.indexOf("}", ii) if ie < 0 { ie = ii } local d = json.substring(ii, ie) print(d) return 0 } } // 3) Print(FunctionCall) minimal (echo/itoa) if json.indexOf("\"FunctionCall\"") >= 0 { local pos = 0 loop (true) { local kfc = "\"kind\":\"FunctionCall\"" local fcp = json.indexOf(kfc, pos) if fcp < 0 { break } local kn = "\"name\":\"" local pn = json.indexOf(kn, fcp) if pn < 0 { break } local ni = pn + kn.length() local nj = json.indexOf("\"", ni) if nj < 0 { break } local fname = json.substring(ni, nj) local ka = "\"arguments\":[" local pa = json.indexOf(ka, nj) if pa < 0 { pos = nj + 1 continue } // string arg local ts = "\"type\":\"string\",\"value\":\"" local ti = json.indexOf(ts, pa) if ti >= 0 { local si = ti + ts.length() local sj = json.indexOf("\"", si) if sj >= 0 { local sval = json.substring(si, sj) if fname == "echo" { print(sval) } pos = sj + 1 continue } } // int arg local ti2 = json.indexOf("\"type\":\"int\",\"value\":", pa) if ti2 >= 0 { local vi = ti2 + "\"type\":\"int\",\"value\":".length() local ve = json.indexOf("}", vi) if ve < 0 { ve = vi } local ival = json.substring(vi, ve) if fname == "itoa" || fname == "echo" { print(ival) } pos = ve + 1 continue } pos = pn + 1 } return 0 } // 4) Print(Compare) minimal if json.indexOf("\"Compare\"") >= 0 { local ko = "\"operation\":\"" local po = json.indexOf(ko) if po >= 0 { local oi = po + ko.length() local oj = json.indexOf("\"", oi) if oj >= 0 { local op = json.substring(oi, oj) local kv = "\"value\":\"" // lhs int local kl = "\"lhs\":{\"kind\":\"Literal\",\"value\":{\"type\":\"int\",\"value\":" local pl = json.indexOf(kl, oj) if pl >= 0 { local li = pl + kl.length() local le = json.indexOf("}", li) if le >= 0 { local la = json.substring(li, le) // rhs int local kr = "\"rhs\":{\"kind\":\"Literal\",\"value\":{\"type\":\"int\",\"value\":" local pr = json.indexOf(kr, le) if pr >= 0 { local ri = pr + kr.length() local re = json.indexOf("}", ri) if re >= 0 { local rb = json.substring(ri, re) // compute local a = 0 local i = 0 loop (i < la.length()) { local ch = la.substring(i, i+1) if ch == "0" { a = a*10+0 i=i+1 continue } if ch == "1" { a=a*10+1 i=i+1 continue } if ch == "2" { a=a*10+2 i=i+1 continue } if ch == "3" { a=a*10+3 i=i+1 continue } if ch == "4" { a=a*10+4 i=i+1 continue } if ch == "5" { a=a*10+5 i=i+1 continue } if ch == "6" { a=a*10+6 i=i+1 continue } if ch == "7" { a=a*10+7 i=i+1 continue } if ch == "8" { a=a*10+8 i=i+1 continue } if ch == "9" { a=a*10+9 i=i+1 continue } break } local b = 0 local j = 0 loop (j < rb.length()) { local ch2 = rb.substring(j, j+1) if ch2 == "0" { b = b*10+0 j=j+1 continue } if ch2 == "1" { b=b*10+1 j=j+1 continue } if ch2 == "2" { b=b*10+2 j=j+1 continue } if ch2 == "3" { b=b*10+3 j=j+1 continue } if ch2 == "4" { b=b*10+4 j=j+1 continue } if ch2 == "5" { b=b*10+5 j=j+1 continue } if ch2 == "6" { b=b*10+6 j=j+1 continue } if ch2 == "7" { b=b*10+7 j=j+1 continue } if ch2 == "8" { b=b*10+8 j=j+1 continue } if ch2 == "9" { b=b*10+9 j=j+1 continue } break } local res = 0 if op == "<" { if a < b { res = 1 } } if op == "==" { if a == b { res = 1 } } if op == "<=" { if a <= b { res = 1 } } if op == ">" { if a > b { res = 1 } } if op == ">=" { if a >= b { res = 1 } } if op == "!=" { if a != b { res = 1 } } print(res) return 0 } } } } } } } // 5) BinaryOp(int+int) typed pattern twice and add（保険） if json.indexOf("\"BinaryOp\"") >= 0 && json.indexOf("\"operator\":\"+\"") >= 0 { local pat = "\"type\":\"int\",\"value\":" local p1 = json.indexOf(pat) if p1 >= 0 { // parse first integer by taking until next closing brace local i = p1 + pat.length() local end1 = json.indexOf("}", i) if end1 < 0 { end1 = i } local a_str = json.substring(i, end1) // convert a_str to int local a = 0 local k = 0 loop (k < a_str.length()) { local ch = a_str.substring(k, k+1) if ch == "0" { a = a * 10 + 0 k = k + 1 continue } if ch == "1" { a = a * 10 + 1 k = k + 1 continue } if ch == "2" { a = a * 10 + 2 k = k + 1 continue } if ch == "3" { a = a * 10 + 3 k = k + 1 continue } if ch == "4" { a = a * 10 + 4 k = k + 1 continue } if ch == "5" { a = a * 10 + 5 k = k + 1 continue } if ch == "6" { a = a * 10 + 6 k = k + 1 continue } if ch == "7" { a = a * 10 + 7 k = k + 1 continue } if ch == "8" { a = a * 10 + 8 k = k + 1 continue } if ch == "9" { a = a * 10 + 9 k = k + 1 continue } break } // parse second integer local p2 = json.lastIndexOf(pat) if p2 >= 0 && p2 != p1 { local j = p2 + pat.length() local end2 = json.indexOf("}", j) if end2 < 0 { end2 = j } local b_str = json.substring(j, end2) local b = 0 local m = 0 loop (m < b_str.length()) { local ch2 = b_str.substring(m, m+1) if ch2 == "0" { b = b * 10 + 0 m = m + 1 continue } if ch2 == "1" { b = b * 10 + 1 m = m + 1 continue } if ch2 == "2" { b = b * 10 + 2 m = m + 1 continue } if ch2 == "3" { b = b * 10 + 3 m = m + 1 continue } if ch2 == "4" { b = b * 10 + 4 m = m + 1 continue } if ch2 == "5" { b = b * 10 + 5 m = m + 1 continue } if ch2 == "6" { b = b * 10 + 6 m = m + 1 continue } if ch2 == "7" { b = b * 10 + 7 m = m + 1 continue } if ch2 == "8" { b = b * 10 + 8 m = m + 1 continue } if ch2 == "9" { b = b * 10 + 9 m = m + 1 continue } break } print(a + b) return 0 } } } // Fallback to full MiniVm runner local vm = new MiniVm() return vm.run(json) } } // Top-level fallback entry for current runner function main(args) { local json = "{\"kind\":\"Program\",\"statements\":[{\"kind\":\"Print\",\"expression\":{\"kind\":\"Literal\",\"value\":{\"type\":\"int\",\"value\":42}}}]}" if args { if args.size() > 0 { local s = args.get(0) if s { json = s } } } local vm = new MiniVm() return vm.run(json) }