2720884a20
- Split expr lowering into ; route calls from stmt lowering
- Implement ternary/peek lowering (MIR13 PHI-off=Copy, PHI-on=Phi)
- Extend JSON v0 AST (ExprV0::{Ternary,Peek}, PeekArmV0)
- Selfhost parser_box: emit Peek JSON; add Stage-2 'Peek basic' smoke
- Reduce warnings: remove unused imports/vars in several modules
- current_task: update plan for legacy VM/Interpreter offboarding
908 lines
37 KiB
Plaintext
908 lines
37 KiB
Plaintext
// ParserBox — Stage‑1 JSON v0 generator（extracted, simplified for Rust parser）
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box ParserBox {
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gpos
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usings_json
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stage3
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birth() { me.gpos = 0 me.usings_json = "[]" me.stage3 = 0 return 0 }
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stage3_enable(flag) {
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if flag == null { flag = 0 }
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if flag == 0 { me.stage3 = 0 } else { me.stage3 = 1 }
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return 0
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}
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stage3_enabled() {
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if me.stage3 == 1 { return 1 }
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return 0
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}
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esc_json(s) {
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local out = ""
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local i = 0
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local n = s.length()
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loop(i < n) {
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local ch = s.substring(i, i+1)
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if ch == "\\" { out = out + "\\\\" } else { if ch == "\"" { out = out + "\\\"" } else { out = out + ch } }
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i = i + 1
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}
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return out
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}
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is_digit(ch) { return ch >= "0" && ch <= "9" }
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is_space(ch) { return ch == " " || ch == "\t" || ch == "\n" || ch == "\r" }
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// simple alpha/underscore check for identifiers
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is_alpha(ch) { return (ch >= "A" && ch <= "Z") || (ch >= "a" && ch <= "z") || ch == "_" }
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gpos_set(i) { me.gpos = i return 0 }
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gpos_get() { return me.gpos }
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// lightweight string helpers
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starts_with(src, i, pat) {
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local n = src.length()
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local m = pat.length()
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if i + m > n { return 0 }
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local k = 0
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loop(k < m) {
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if src.substring(i + k, i + k + 1) != pat.substring(k, k + 1) { return 0 }
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k = k + 1
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}
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return 1
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}
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index_of(src, i, pat) {
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local n = src.length()
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local m = pat.length()
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if m == 0 { return i }
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local j = i
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loop(j + m <= n) {
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if me.starts_with(src, j, pat) { return j }
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j = j + 1
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}
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return -1
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}
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trim(s) {
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local i = 0
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local n = s.length()
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loop(i < n && (s.substring(i,i+1) == " " || s.substring(i,i+1) == "\t")) { i = i + 1 }
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local j = n
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loop(j > i && (s.substring(j-1,j) == " " || s.substring(j-1,j) == "\t" || s.substring(j-1,j) == ";")) { j = j - 1 }
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return s.substring(i, j)
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}
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// keyword match at position i with word-boundary (next char not [A-Za-z0-9_])
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starts_with_kw(src, i, kw) {
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if me.starts_with(src, i, kw) == 0 { return 0 }
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local n = src.length()
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local j = i + kw.length()
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if j >= n { return 1 }
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local ch = src.substring(j, j+1)
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if me.is_alpha(ch) || me.is_digit(ch) { return 0 }
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return 1
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}
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// integer to string (uses string concat coercion)
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i2s(v) { return "" + v }
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// Read identifier starting at i: [A-Za-z_][A-Za-z0-9_]*; returns "name@pos"
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read_ident2(src, i) {
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local n = src.length()
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local j = i
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if j >= n { return "@" + me.i2s(i) }
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local ch = src.substring(j, j+1)
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if me.is_alpha(ch) == 0 { return "@" + me.i2s(i) }
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j = j + 1
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loop(j < n) {
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local c = src.substring(j, j+1)
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if me.is_alpha(c) || me.is_digit(c) { j = j + 1 } else { break }
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}
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local name = src.substring(i, j)
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return name + "@" + me.i2s(j)
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}
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// Read string literal at i (i points to '"'); returns raw content (no quotes), updates gpos
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read_string_lit(src, i) {
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local n = src.length()
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local j = i
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if j >= n || src.substring(j, j+1) != "\"" { me.gpos_set(i) return "" }
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j = j + 1
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local out = ""
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local guard = 0
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local max = 200000
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loop(j < n) {
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if guard > max { break } else { guard = guard + 1 }
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local ch = src.substring(j, j+1)
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if ch == "\"" { j = j + 1 me.gpos_set(j) return out }
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if ch == "\\" && j + 1 < n {
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local nx = src.substring(j+1, j+2)
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if nx == "\"" { out = out + "\"" } else { if nx == "\\" { out = out + "\\" } else { out = out + nx } }
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j = j + 2
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} else { out = out + ch j = j + 1 }
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}
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me.gpos_set(j)
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return out
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}
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// Append a using entry into usings_json (no-op acceptance path)
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add_using(kind, target, alias) {
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// kind: "path" or "ns"; target: path or namespace; alias: nullable
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local cur = me.usings_json
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if cur == null || cur.length() == 0 { cur = "[]" }
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// Build entry
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local name = ""
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local path = null
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if kind == "path" {
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path = target
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if alias != null { name = alias } else {
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local p = target
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// basename
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local idx = -1
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local t = 0
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loop(t < p.length()) { if p.substring(t,t+1) == "/" { idx = t } t = t + 1 }
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if idx >= 0 { p = p.substring(idx+1, p.length()) }
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if p.length() > 6 && me.starts_with(p, p.length()-6, ".nyash") == 1 { p = p.substring(0, p.length()-6) }
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name = p
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}
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} else {
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name = target
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if alias != null { name = alias }
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}
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local entry = "{\"name\":\"" + me.esc_json(name) + "\""
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if path != null { entry = entry + ",\"path\":\"" + me.esc_json(path) + "\"" }
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entry = entry + "}"
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// Insert before closing ']' of array
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if cur == "[]" { me.usings_json = "[" + entry + "]" return 0 }
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// naive append
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local pos = cur.lastIndexOf("]")
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if pos < 0 { me.usings_json = "[" + entry + "]" return 0 }
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me.usings_json = cur.substring(0, pos) + "," + entry + "]"
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return 0
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}
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// Collect `using` lines into JSON array stored in me.usings_json (no-op acceptance)
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extract_usings(src) {
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if src == null { me.usings_json = "[]" return 0 }
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local n = src.length()
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local i = 0
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local first = 1
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local out = "["
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loop(i < n) {
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// read a line
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local j = i
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loop(j < n && src.substring(j, j+1) != "\n") { j = j + 1 }
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local line = src.substring(i, j)
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// process
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local k = 0
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loop(k < line.length() && (line.substring(k,k+1) == " " || line.substring(k,k+1) == "\t")) { k = k + 1 }
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if me.starts_with(line, k, "using ") == 1 {
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local rest = me.trim(line.substring(k + 6, line.length()))
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// split on ' as '
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local as_pos = me.index_of(rest, 0, " as ")
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local target = rest
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local alias = null
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if as_pos >= 0 {
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target = me.trim(rest.substring(0, as_pos))
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alias = me.trim(rest.substring(as_pos + 4, rest.length()))
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}
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// path or namespace
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local is_path = 0
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if target.length() > 0 {
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if me.starts_with(target, 0, "\"") == 1 { is_path = 1 }
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if me.starts_with(target, 0, "./") == 1 { is_path = 1 }
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if me.starts_with(target, 0, "/") == 1 { is_path = 1 }
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if target.length() >= 6 && me.starts_with(target, target.length()-6, ".nyash") == 1 { is_path = 1 }
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}
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local name = ""
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local path = null
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if is_path == 1 {
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// trim quotes
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if me.starts_with(target, 0, "\"") == 1 {
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target = target.substring(1, target.length())
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if target.length() > 0 && target.substring(target.length()-1, target.length()) == "\"" {
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target = target.substring(0, target.length()-1)
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}
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}
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path = target
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if alias != null { name = alias } else {
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// derive from basename
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local p = target
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// find last '/'
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local idx = -1
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local t = 0
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loop(t < p.length()) { if p.substring(t,t+1) == "/" { idx = t } t = t + 1 }
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if idx >= 0 { p = p.substring(idx+1, p.length()) }
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// strip .nyash
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if p.length() > 6 && me.starts_with(p, p.length()-6, ".nyash") == 1 { p = p.substring(0, p.length()-6) }
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name = p
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}
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} else {
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name = target
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}
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// append JSON entry
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if first == 0 { out = out + "," } else { first = 0 }
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out = out + "{\"name\":\"" + me.esc_json(name) + "\""
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if path != null { out = out + ",\"path\":\"" + me.esc_json(path) + "\"" }
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out = out + "}"
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}
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i = j + 1
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}
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out = out + "]"
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me.usings_json = out
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return 0
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}
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get_usings_json() { return me.usings_json }
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to_int(s) { local n = s.length() if n == 0 { return 0 } local i = 0 local acc = 0 loop(i < n) { local d = s.substring(i, i+1) local dv = 0 if d == "1" { dv = 1 } else { if d == "2" { dv = 2 } else { if d == "3" { dv = 3 } else { if d == "4" { dv = 4 } else { if d == "5" { dv = 5 } else { if d == "6" { dv = 6 } else { if d == "7" { dv = 7 } else { if d == "8" { dv = 8 } else { if d == "9" { dv = 9 } } } } } } } } } acc = acc * 10 + dv i = i + 1 } return acc }
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skip_ws(src, i) { if src == null { return i } local n = src.length() local cont = 1 local guard = 0 local max = 100000 loop(cont == 1) { if guard > max { return i } guard = guard + 1 if i < n { if me.is_space(src.substring(i, i+1)) { i = i + 1 } else { cont = 0 } } else { cont = 0 } } return i }
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// identifiers/strings not required for Stage‑1 beyond string literal parse above
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// using metadata omitted in Stage‑1
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parse_number2(src, i) { local n = src.length() local j = i local cont = 1 local guard = 0 local max = 100000 loop(cont == 1) { if guard > max { cont = 0 } else { guard = guard + 1 if j < n { if me.is_digit(src.substring(j, j+1)) { j = j + 1 } else { cont = 0 } } else { cont = 0 } } } local s = src.substring(i, j) me.gpos_set(j) return "{\"type\":\"Int\",\"value\":" + s + "}" }
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parse_string2(src, i) { local n = src.length() local j = i + 1 local out = "" local guard = 0 local max = 200000 loop(j < n) { if guard > max { break } guard = guard + 1 local ch = src.substring(j, j+1) if ch == "\"" { j = j + 1 me.gpos_set(j) return "{\"type\":\"Str\",\"value\":\"" + me.esc_json(out) + "\"}" } if ch == "\\" && j + 1 < n { local nx = src.substring(j+1, j+2) if nx == "\"" { out = out + "\"" } else { if nx == "\\" { out = out + "\\" } else { out = out + nx } } j = j + 2 } else { out = out + ch j = j + 1 } } me.gpos_set(j) return "{\"type\":\"Str\",\"value\":\"" + me.esc_json(out) + "\"}" }
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parse_factor2(src, i) {
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local j = me.skip_ws(src, i)
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if j >= src.length() { me.gpos_set(j) return "{\"type\":\"Int\",\"value\":0}" }
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if me.starts_with_kw(src, j, "true") == 1 { me.gpos_set(j + 4) return "{\"type\":\"Bool\",\"value\":true}" }
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if me.starts_with_kw(src, j, "false") == 1 { me.gpos_set(j + 5) return "{\"type\":\"Bool\",\"value\":false}" }
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if me.starts_with_kw(src, j, "null") == 1 { me.gpos_set(j + 4) return "{\"type\":\"Null\"}" }
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// Peek expression: peek <expr> { "label" => <expr>, ..., else => <expr> }
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if me.starts_with_kw(src, j, "peek") == 1 {
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j = j + 4
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j = me.skip_ws(src, j)
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// scrutinee expression
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local scr = me.parse_expr2(src, j)
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j = me.gpos_get()
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j = me.skip_ws(src, j)
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if src.substring(j, j+1) == "{" { j = j + 1 } // enter arms block
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j = me.skip_ws(src, j)
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local arms_json = "["
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local first_arm = 1
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local else_json = null
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local n = src.length()
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local contp = 1
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local guardp = 0
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local maxp = 400000
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loop(contp == 1) {
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if guardp > maxp { contp = 0 } else { guardp = guardp + 1 }
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j = me.skip_ws(src, j)
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if j >= n { contp = 0 } else {
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if src.substring(j, j+1) == "}" {
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j = j + 1
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contp = 0
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} else {
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// else arm or labeled arm
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if me.starts_with_kw(src, j, "else") == 1 {
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j = j + 4
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j = me.skip_ws(src, j)
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if src.substring(j, j+2) == "=>" { j = j + 2 }
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j = me.skip_ws(src, j)
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// else body may be a block or bare expr
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if src.substring(j, j+1) == "{" {
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j = j + 1
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j = me.skip_ws(src, j)
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else_json = me.parse_expr2(src, j)
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j = me.gpos_get()
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j = me.skip_ws(src, j)
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if src.substring(j, j+1) == "}" { j = j + 1 }
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} else {
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else_json = me.parse_expr2(src, j)
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j = me.gpos_get()
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}
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// optional separator/newline tolerated; continue until '}'
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} else {
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// labeled arm: string literal label
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if src.substring(j, j+1) != "\"" {
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// degrade safely to avoid infinite loop
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j = j + 1
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continue
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}
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local label_raw = me.read_string_lit(src, j)
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j = me.gpos_get()
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j = me.skip_ws(src, j)
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if src.substring(j, j+2) == "=>" { j = j + 2 }
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j = me.skip_ws(src, j)
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// arm expr: block or bare expr
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local expr_json = "{\"type\":\"Int\",\"value\":0}"
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if src.substring(j, j+1) == "{" {
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j = j + 1
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j = me.skip_ws(src, j)
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expr_json = me.parse_expr2(src, j)
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j = me.gpos_get()
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j = me.skip_ws(src, j)
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if src.substring(j, j+1) == "}" { j = j + 1 }
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} else {
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expr_json = me.parse_expr2(src, j)
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j = me.gpos_get()
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}
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local arm_json = "{\"label\":\"" + me.esc_json(label_raw) + "\",\"expr\":" + expr_json + "}"
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if first_arm == 1 { arms_json = arms_json + arm_json first_arm = 0 } else { arms_json = arms_json + "," + arm_json }
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}
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}
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}
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}
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arms_json = arms_json + "]"
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if else_json == null { else_json = "{\"type\":\"Null\"}" }
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me.gpos_set(j)
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return "{\"type\":\"Peek\",\"scrutinee\":" + scr + ",\"arms\":" + arms_json + ",\"else\":" + else_json + "}"
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}
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local ch = src.substring(j, j+1)
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// Parenthesized
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if ch == "(" {
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local inner = me.parse_expr2(src, j + 1)
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local k = me.gpos_get()
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k = me.skip_ws(src, k)
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if src.substring(k, k+1) == ")" { k = k + 1 }
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me.gpos_set(k)
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return inner
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}
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// String literal
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if ch == "\"" { return me.parse_string2(src, j) }
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// Map literal: {"k": v, ...} (string keys only) → Call{name:"map.of", args:[Str(k1), v1, Str(k2), v2, ...]}
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if ch == "{" {
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local n = src.length()
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j = j + 1
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local out = "["
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local first = 1
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local cont = 1
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local guard = 0
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local max = 400000
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loop(cont == 1) {
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if guard > max { cont = 0 } else { guard = guard + 1 }
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j = me.skip_ws(src, j)
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if j >= n { cont = 0 } else {
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if src.substring(j, j+1) == "}" { j = j + 1 cont = 0 } else {
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// key (string only for Stage-2)
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if src.substring(j, j+1) != "\"" {
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// degrade by skipping one char to avoid infinite loop
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j = j + 1
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continue
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}
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local key_raw = me.read_string_lit(src, j)
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j = me.gpos_get()
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j = me.skip_ws(src, j)
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if src.substring(j, j+1) == ":" { j = j + 1 }
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j = me.skip_ws(src, j)
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local val_json = me.parse_expr2(src, j)
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j = me.gpos_get()
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local key_json = "{\"type\":\"Str\",\"value\":\"" + me.esc_json(key_raw) + "\"}"
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if first == 1 { out = out + key_json + "," + val_json first = 0 } else { out = out + "," + key_json + "," + val_json }
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// optional comma
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local before2 = j
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j = me.skip_ws(src, j)
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if j < n && src.substring(j, j+1) == "," { j = j + 1 }
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// progress guard (in case of malformed input)
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if j <= before2 { if j < n { j = j + 1 } else { j = n } }
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}
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}
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}
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out = out + "]"
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me.gpos_set(j)
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return "{\"type\":\"Call\",\"name\":\"map.of\",\"args\":" + out + "}"
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}
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// Array literal: [e1, e2, ...] → Call{name:"array.of", args:[...]}
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if ch == "[" {
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local n = src.length()
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j = j + 1
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local out = "["
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local first = 1
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local cont = 1
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local guard = 0
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local max = 400000
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loop(cont == 1) {
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if guard > max { cont = 0 } else { guard = guard + 1 }
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j = me.skip_ws(src, j)
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if j >= n { cont = 0 } else {
|
||
if src.substring(j, j+1) == "]" { j = j + 1 cont = 0 } else {
|
||
local before = j
|
||
local ej = me.parse_expr2(src, j)
|
||
j = me.gpos_get()
|
||
if first == 1 { out = out + ej first = 0 } else { out = out + "," + ej }
|
||
// optional comma+whitespace
|
||
local before2 = j
|
||
j = me.skip_ws(src, j)
|
||
if j < n && src.substring(j, j+1) == "," { j = j + 1 }
|
||
// progress guard
|
||
if j <= before { if j < n { j = j + 1 } else { j = n } }
|
||
}
|
||
}
|
||
}
|
||
out = out + "]"
|
||
me.gpos_set(j)
|
||
return "{\"type\":\"Call\",\"name\":\"array.of\",\"args\":" + out + "}"
|
||
}
|
||
// true/false
|
||
if me.starts_with_kw(src, j, "true") == 1 { me.gpos_set(j + 4) return "{\"type\":\"Bool\",\"value\":true}" }
|
||
if me.starts_with_kw(src, j, "false") == 1 { me.gpos_set(j + 5) return "{\"type\":\"Bool\",\"value\":false}" }
|
||
// new Class(args)
|
||
if me.starts_with_kw(src, j, "new") == 1 {
|
||
local p = me.skip_ws(src, j + 3)
|
||
local idp = me.read_ident2(src, p)
|
||
local at = idp.lastIndexOf("@")
|
||
local cls = idp.substring(0, at)
|
||
local k = me.to_int(idp.substring(at+1, idp.length()))
|
||
k = me.skip_ws(src, k)
|
||
if src.substring(k, k+1) == "(" { k = k + 1 }
|
||
local args_and_pos = me.parse_args2(src, k)
|
||
local at2 = args_and_pos.lastIndexOf("@")
|
||
local args_json = args_and_pos.substring(0, at2)
|
||
k = me.to_int(args_and_pos.substring(at2+1, args_and_pos.length()))
|
||
k = me.skip_ws(src, k)
|
||
if src.substring(k, k+1) == ")" { k = k + 1 }
|
||
me.gpos_set(k)
|
||
return "{\"type\":\"New\",\"class\":\"" + cls + "\",\"args\":" + args_json + "}"
|
||
}
|
||
// Identifier / Call / Method chain
|
||
if me.is_alpha(ch) {
|
||
local idp = me.read_ident2(src, j)
|
||
local at = idp.lastIndexOf("@")
|
||
local name = idp.substring(0, at)
|
||
local k = me.to_int(idp.substring(at+1, idp.length()))
|
||
local node = "{\"type\":\"Var\",\"name\":\"" + name + "\"}"
|
||
local cont2 = 1
|
||
loop(cont2 == 1) {
|
||
k = me.skip_ws(src, k)
|
||
local tch = src.substring(k, k+1)
|
||
if tch == "(" {
|
||
k = k + 1
|
||
local args_and_pos = me.parse_args2(src, k)
|
||
local at2 = args_and_pos.lastIndexOf("@")
|
||
local args_json = args_and_pos.substring(0, at2)
|
||
k = me.to_int(args_and_pos.substring(at2+1, args_and_pos.length()))
|
||
k = me.skip_ws(src, k)
|
||
if src.substring(k, k+1) == ")" { k = k + 1 }
|
||
node = "{\"type\":\"Call\",\"name\":\"" + name + "\",\"args\":" + args_json + "}"
|
||
} else {
|
||
if tch == "." {
|
||
k = k + 1
|
||
k = me.skip_ws(src, k)
|
||
local midp = me.read_ident2(src, k)
|
||
local at3 = midp.lastIndexOf("@")
|
||
local mname = midp.substring(0, at3)
|
||
k = me.to_int(midp.substring(at3+1, midp.length()))
|
||
k = me.skip_ws(src, k)
|
||
if src.substring(k, k+1) == "(" { k = k + 1 }
|
||
local args2 = me.parse_args2(src, k)
|
||
local at4 = args2.lastIndexOf("@")
|
||
local args_json2 = args2.substring(0, at4)
|
||
k = me.to_int(args2.substring(at4+1, args2.length()))
|
||
k = me.skip_ws(src, k)
|
||
if src.substring(k, k+1) == ")" { k = k + 1 }
|
||
node = "{\"type\":\"Method\",\"recv\":" + node + ",\"method\":\"" + mname + "\",\"args\":" + args_json2 + "}"
|
||
} else { cont2 = 0 }
|
||
}
|
||
}
|
||
me.gpos_set(k)
|
||
return node
|
||
}
|
||
// Fallback: number
|
||
return me.parse_number2(src, j)
|
||
}
|
||
// unary minus binds tighter than * /
|
||
parse_unary2(src, i) {
|
||
local j = me.skip_ws(src, i)
|
||
if src.substring(j, j+1) == "-" {
|
||
local rhs = me.parse_factor2(src, j + 1)
|
||
j = me.gpos_get()
|
||
local zero = "{\"type\":\"Int\",\"value\":0}"
|
||
me.gpos_set(j)
|
||
return "{\"type\":\"Binary\",\"op\":\"-\",\"lhs\":" + zero + ",\"rhs\":" + rhs + "}"
|
||
}
|
||
return me.parse_factor2(src, j)
|
||
}
|
||
parse_term2(src, i) { local lhs = me.parse_unary2(src, i) local j = me.gpos_get() local cont = 1 loop(cont == 1) { j = me.skip_ws(src, j) if j >= src.length() { cont = 0 } else { local op = src.substring(j, j+1) if op != "*" && op != "/" { cont = 0 } else { local rhs = me.parse_unary2(src, j+1) j = me.gpos_get() lhs = "{\"type\":\"Binary\",\"op\":\"" + op + "\",\"lhs\":" + lhs + ",\"rhs\":" + rhs + "}" } } } me.gpos_set(j) return lhs }
|
||
parse_sum2(src, i) { local lhs = me.parse_term2(src, i) local j = me.gpos_get() local cont = 1 loop(cont == 1) { j = me.skip_ws(src, j) if j >= src.length() { cont = 0 } else { local op = src.substring(j, j+1) if op != "+" && op != "-" { cont = 0 } else { local rhs = me.parse_term2(src, j+1) j = me.gpos_get() lhs = "{\"type\":\"Binary\",\"op\":\"" + op + "\",\"lhs\":" + lhs + ",\"rhs\":" + rhs + "}" } } } me.gpos_set(j) return lhs }
|
||
parse_compare2(src, i) { local lhs = me.parse_sum2(src, i) local j = me.gpos_get() j = me.skip_ws(src, j) local two = src.substring(j, j+2) local one = src.substring(j, j+1) local op = "" if two == "==" || two == "!=" || two == "<=" || two == ">=" { op = two j = j + 2 } else { if one == "<" || one == ">" { op = one j = j + 1 } } if op == "" { me.gpos_set(j) return lhs } local rhs = me.parse_sum2(src, j) j = me.gpos_get() me.gpos_set(j) return "{\"type\":\"Compare\",\"op\":\"" + op + "\",\"lhs\":" + lhs + ",\"rhs\":" + rhs + "}" }
|
||
parse_expr2(src, i) {
|
||
local lhs = me.parse_compare2(src, i)
|
||
local j = me.gpos_get()
|
||
local cont = 1
|
||
loop(cont == 1) {
|
||
j = me.skip_ws(src, j)
|
||
local two = src.substring(j, j+2)
|
||
if two != "&&" && two != "||" { cont = 0 } else {
|
||
local rhs = me.parse_compare2(src, j+2)
|
||
j = me.gpos_get()
|
||
lhs = "{\"type\":\"Logical\",\"op\":\"" + two + "\",\"lhs\":" + lhs + ",\"rhs\":" + rhs + "}"
|
||
}
|
||
}
|
||
j = me.skip_ws(src, j)
|
||
if src.substring(j, j+1) == "?" {
|
||
j = j + 1
|
||
j = me.skip_ws(src, j)
|
||
local then_expr = me.parse_expr2(src, j)
|
||
j = me.gpos_get()
|
||
j = me.skip_ws(src, j)
|
||
if src.substring(j, j+1) == ":" { j = j + 1 }
|
||
j = me.skip_ws(src, j)
|
||
local else_expr = me.parse_expr2(src, j)
|
||
j = me.gpos_get()
|
||
if else_expr.length() == 0 { else_expr = "{\"type\":\"Int\",\"value\":0}" }
|
||
me.gpos_set(j)
|
||
return "{\"type\":\"Ternary\",\"cond\":" + lhs + ",\"then\":" + then_expr + ",\"else\":" + else_expr + "}"
|
||
}
|
||
me.gpos_set(j)
|
||
return lhs
|
||
}
|
||
parse_args2(src, i) {
|
||
local j = me.skip_ws(src, i)
|
||
local n = src.length()
|
||
local out = "["
|
||
j = me.skip_ws(src, j)
|
||
if j < n && src.substring(j, j+1) == ")" { return "[]@" + me.i2s(j) }
|
||
// first argument
|
||
local e = me.parse_expr2(src, j)
|
||
j = me.gpos_get()
|
||
out = out + e
|
||
// subsequent arguments with guard
|
||
local cont_args = 1
|
||
local guard = 0
|
||
local max = 100000
|
||
loop(cont_args == 1) {
|
||
if guard > max { cont_args = 0 } else { guard = guard + 1 }
|
||
local before = j
|
||
j = me.skip_ws(src, j)
|
||
if j < n && src.substring(j, j+1) == "," {
|
||
j = j + 1
|
||
j = me.skip_ws(src, j)
|
||
e = me.parse_expr2(src, j)
|
||
j = me.gpos_get()
|
||
out = out + "," + e
|
||
} else { cont_args = 0 }
|
||
if j == before { cont_args = 0 }
|
||
}
|
||
out = out + "]"
|
||
return out + "@" + me.i2s(j)
|
||
}
|
||
parse_stmt2(src, i) {
|
||
local j = me.skip_ws(src, i)
|
||
local stmt_start = j
|
||
if me.starts_with_kw(src, j, "using") == 1 {
|
||
j = j + 5
|
||
j = me.skip_ws(src, j)
|
||
if src.substring(j, j+1) == "\"" {
|
||
local p = me.read_string_lit(src, j)
|
||
j = me.gpos_get()
|
||
j = me.skip_ws(src, j)
|
||
local alias = null
|
||
if me.starts_with_kw(src, j, "as") == 1 { j = j + 2 j = me.skip_ws(src, j) local idp = me.read_ident2(src, j) local at = idp.lastIndexOf("@") alias = idp.substring(0, at) j = me.to_int(idp.substring(at+1, idp.length())) }
|
||
me.add_using("path", p, alias)
|
||
} else {
|
||
if me.is_alpha(src.substring(j, j+1)) {
|
||
local idp = me.read_ident2(src, j)
|
||
local at = idp.lastIndexOf("@")
|
||
local name = idp.substring(0, at)
|
||
j = me.to_int(idp.substring(at+1, idp.length()))
|
||
local cont = 1
|
||
loop(cont == 1) {
|
||
j = me.skip_ws(src, j)
|
||
if src.substring(j, j+1) == "." { j = j + 1 j = me.skip_ws(src, j) idp = me.read_ident2(src, j) at = idp.lastIndexOf("@") name = name + "." + idp.substring(0, at) j = me.to_int(idp.substring(at+1, idp.length())) } else { cont = 0 }
|
||
}
|
||
j = me.skip_ws(src, j)
|
||
local alias2 = null
|
||
if me.starts_with_kw(src, j, "as") == 1 { j = j + 2 j = me.skip_ws(src, j) idp = me.read_ident2(src, j) at = idp.lastIndexOf("@") alias2 = idp.substring(0, at) j = me.to_int(idp.substring(at+1, idp.length())) }
|
||
me.add_using("ns", name, alias2)
|
||
}
|
||
}
|
||
// ensure progress
|
||
if j <= stmt_start { if j < src.length() { j = j + 1 } else { j = src.length() } }
|
||
me.gpos_set(j)
|
||
return ""
|
||
}
|
||
// simple assignment: IDENT '=' expr ; → JSON v0 Local{name, expr} (Stage‑2 uses Local for updates)
|
||
if j < src.length() && me.is_alpha(src.substring(j, j+1)) {
|
||
local idp0 = me.read_ident2(src, j)
|
||
local at0 = idp0.lastIndexOf("@")
|
||
if at0 > 0 {
|
||
local name0 = idp0.substring(0, at0)
|
||
local k0 = me.to_int(idp0.substring(at0+1, idp0.length()))
|
||
k0 = me.skip_ws(src, k0)
|
||
if k0 < src.length() && src.substring(k0, k0+1) == "=" {
|
||
local eq_two = "="
|
||
if k0 + 1 < src.length() { eq_two = src.substring(k0, k0+2) }
|
||
if eq_two != "==" {
|
||
k0 = k0 + 1
|
||
k0 = me.skip_ws(src, k0)
|
||
local default_local = "{\"type\":\"Int\",\"value\":0}"
|
||
local expr_json0 = default_local
|
||
local end_pos0 = k0
|
||
if k0 < src.length() {
|
||
local ahead = src.substring(k0, k0+1)
|
||
if ahead != "}" && ahead != ";" {
|
||
expr_json0 = me.parse_expr2(src, k0)
|
||
end_pos0 = me.gpos_get()
|
||
}
|
||
}
|
||
k0 = end_pos0
|
||
if k0 <= stmt_start { if k0 < src.length() { k0 = k0 + 1 } else { k0 = src.length() } }
|
||
me.gpos_set(k0)
|
||
return "{\"type\":\"Local\",\"name\":\"" + name0 + "\",\"expr\":" + expr_json0 + "}"
|
||
}
|
||
}
|
||
}
|
||
}
|
||
if me.starts_with_kw(src, j, "return") == 1 {
|
||
j = j + 6
|
||
j = me.skip_ws(src, j)
|
||
local default_ret = "{\"type\":\"Int\",\"value\":0}"
|
||
local expr_json_ret = default_ret
|
||
local end_pos_ret = j
|
||
if j < src.length() {
|
||
local ahead_ret = src.substring(j, j+1)
|
||
if ahead_ret != "}" && ahead_ret != ";" {
|
||
expr_json_ret = me.parse_expr2(src, j)
|
||
end_pos_ret = me.gpos_get()
|
||
}
|
||
}
|
||
j = end_pos_ret
|
||
if j <= stmt_start { if j < src.length() { j = j + 1 } else { j = src.length() } }
|
||
me.gpos_set(j)
|
||
return "{\"type\":\"Return\",\"expr\":" + expr_json_ret + "}"
|
||
}
|
||
if me.starts_with_kw(src, j, "local") == 1 {
|
||
j = j + 5
|
||
j = me.skip_ws(src, j)
|
||
local idp = me.read_ident2(src, j)
|
||
local at = idp.lastIndexOf("@")
|
||
local name = idp.substring(0, at)
|
||
j = me.to_int(idp.substring(at+1, idp.length()))
|
||
j = me.skip_ws(src, j)
|
||
if j < src.length() && src.substring(j, j+1) == "=" { j = j + 1 }
|
||
j = me.skip_ws(src, j)
|
||
local default_local = "{\"type\":\"Int\",\"value\":0}"
|
||
local expr_json_local = default_local
|
||
local end_pos_local = j
|
||
if j < src.length() {
|
||
local ahead_local = src.substring(j, j+1)
|
||
if ahead_local != "}" && ahead_local != ";" {
|
||
expr_json_local = me.parse_expr2(src, j)
|
||
end_pos_local = me.gpos_get()
|
||
}
|
||
}
|
||
j = end_pos_local
|
||
if j <= stmt_start { if j < src.length() { j = j + 1 } else { j = src.length() } }
|
||
me.gpos_set(j)
|
||
return "{\"type\":\"Local\",\"name\":\"" + name + "\",\"expr\":" + expr_json_local + "}"
|
||
}
|
||
if me.starts_with_kw(src, j, "if") == 1 {
|
||
j = j + 2
|
||
j = me.skip_ws(src, j)
|
||
local paren = 0
|
||
if src.substring(j, j+1) == "(" { paren = 1 j = j + 1 }
|
||
local cond = me.parse_expr2(src, j)
|
||
j = me.gpos_get()
|
||
if paren == 1 { j = me.skip_ws(src, j) if src.substring(j, j+1) == ")" { j = j + 1 } }
|
||
j = me.skip_ws(src, j)
|
||
local then_res = me.parse_block2(src, j)
|
||
local at1 = then_res.lastIndexOf("@")
|
||
local then_json = then_res.substring(0, at1)
|
||
j = me.to_int(then_res.substring(at1+1, then_res.length()))
|
||
j = me.skip_ws(src, j)
|
||
local else_json = null
|
||
if me.starts_with_kw(src, j, "else") == 1 { j = j + 4 j = me.skip_ws(src, j) local else_res = me.parse_block2(src, j) local at2 = else_res.lastIndexOf("@") else_json = else_res.substring(0, at2) j = me.to_int(else_res.substring(at2+1, else_res.length())) }
|
||
if j <= stmt_start { if j < src.length() { j = j + 1 } else { j = src.length() } }
|
||
me.gpos_set(j)
|
||
if else_json == null { return "{\"type\":\"If\",\"cond\":" + cond + ",\"then\":" + then_json + "}" } else { return "{\"type\":\"If\",\"cond\":" + cond + ",\"then\":" + then_json + ",\"else\":" + else_json + "}" }
|
||
}
|
||
if me.starts_with_kw(src, j, "loop") == 1 {
|
||
j = j + 4
|
||
j = me.skip_ws(src, j)
|
||
if src.substring(j, j+1) == "(" { j = j + 1 }
|
||
local cond = me.parse_expr2(src, j)
|
||
j = me.gpos_get()
|
||
j = me.skip_ws(src, j)
|
||
if src.substring(j, j+1) == ")" { j = j + 1 }
|
||
j = me.skip_ws(src, j)
|
||
local body_res = me.parse_block2(src, j)
|
||
local at3 = body_res.lastIndexOf("@")
|
||
local body_json = body_res.substring(0, at3)
|
||
j = me.to_int(body_res.substring(at3+1, body_res.length()))
|
||
if j <= stmt_start { if j < src.length() { j = j + 1 } else { j = src.length() } }
|
||
me.gpos_set(j)
|
||
return "{\"type\":\"Loop\",\"cond\":" + cond + ",\"body\":" + body_json + "}"
|
||
}
|
||
// Stage-3 acceptance (syntax only): break / continue → no-op expression
|
||
if me.starts_with_kw(src, j, "break") == 1 {
|
||
j = j + 5
|
||
if me.stage3_enabled() == 1 {
|
||
j = me.skip_ws(src, j)
|
||
if j <= stmt_start { if j < src.length() { j = j + 1 } else { j = src.length() } }
|
||
me.gpos_set(j)
|
||
return "{\"type\":\"Break\"}"
|
||
}
|
||
if j <= stmt_start { if j < src.length() { j = j + 1 } else { j = src.length() } }
|
||
me.gpos_set(j)
|
||
return "{\"type\":\"Expr\",\"expr\":{\"type\":\"Int\",\"value\":0}}"
|
||
}
|
||
if me.starts_with_kw(src, j, "continue") == 1 {
|
||
j = j + 8
|
||
if me.stage3_enabled() == 1 {
|
||
j = me.skip_ws(src, j)
|
||
if j <= stmt_start { if j < src.length() { j = j + 1 } else { j = src.length() } }
|
||
me.gpos_set(j)
|
||
return "{\"type\":\"Continue\"}"
|
||
}
|
||
if j <= stmt_start { if j < src.length() { j = j + 1 } else { j = src.length() } }
|
||
me.gpos_set(j)
|
||
return "{\"type\":\"Expr\",\"expr\":{\"type\":\"Int\",\"value\":0}}"
|
||
}
|
||
// Stage-3 acceptance: throw expr → degrade to Expr(expr)
|
||
if me.starts_with_kw(src, j, "throw") == 1 {
|
||
j = j + 5
|
||
j = me.skip_ws(src, j)
|
||
local e_throw = me.parse_expr2(src, j)
|
||
j = me.gpos_get()
|
||
if me.stage3_enabled() == 1 {
|
||
if j <= stmt_start { if j < src.length() { j = j + 1 } else { j = src.length() } }
|
||
me.gpos_set(j)
|
||
return "{\"type\":\"Throw\",\"expr\":" + e_throw + "}"
|
||
}
|
||
if j <= stmt_start { if j < src.length() { j = j + 1 } else { j = src.length() } }
|
||
me.gpos_set(j)
|
||
return "{\"type\":\"Expr\",\"expr\":" + e_throw + "}"
|
||
}
|
||
// Stage-3 acceptance: try { ... } (catch ...)* (finally { ... })? → degrade to no-op (syntax only)
|
||
if me.starts_with_kw(src, j, "try") == 1 {
|
||
j = j + 3
|
||
j = me.skip_ws(src, j)
|
||
// parse try block
|
||
local try_res = me.parse_block2(src, j)
|
||
local at_t = try_res.lastIndexOf("@")
|
||
local try_json = try_res.substring(0, at_t)
|
||
j = me.to_int(try_res.substring(at_t+1, try_res.length()))
|
||
local catches_json = "["
|
||
local catch_first = 1
|
||
// zero or more catch
|
||
local guard_ct = 0
|
||
local max_ct = 100
|
||
local cont_ct = 1
|
||
loop(cont_ct == 1) {
|
||
if guard_ct > max_ct { cont_ct = 0 } else { guard_ct = guard_ct + 1 }
|
||
j = me.skip_ws(src, j)
|
||
if me.starts_with_kw(src, j, "catch") == 1 {
|
||
j = j + 5
|
||
j = me.skip_ws(src, j)
|
||
local catch_type = null
|
||
local catch_param = null
|
||
if src.substring(j, j+1) == "(" { j = j + 1 j = me.skip_ws(src, j)
|
||
// optional type + name
|
||
if me.is_alpha(src.substring(j, j+1)) {
|
||
local id1 = me.read_ident2(src, j)
|
||
local at1 = id1.lastIndexOf("@")
|
||
catch_type = id1.substring(0, at1)
|
||
j = me.to_int(id1.substring(at1+1, id1.length()))
|
||
j = me.skip_ws(src, j)
|
||
}
|
||
if me.is_alpha(src.substring(j, j+1)) {
|
||
local id2 = me.read_ident2(src, j)
|
||
local at2 = id2.lastIndexOf("@")
|
||
catch_param = id2.substring(0, at2)
|
||
j = me.to_int(id2.substring(at2+1, id2.length()))
|
||
j = me.skip_ws(src, j)
|
||
}
|
||
if src.substring(j, j+1) == ")" { j = j + 1 }
|
||
}
|
||
j = me.skip_ws(src, j)
|
||
// catch body
|
||
local c_res = me.parse_block2(src, j)
|
||
local atc = c_res.lastIndexOf("@")
|
||
j = me.to_int(c_res.substring(atc+1, c_res.length()))
|
||
if me.stage3_enabled() == 1 {
|
||
local entry = "{"
|
||
local wrote = 0
|
||
if catch_param != null && catch_param.length() > 0 { entry = entry + "\"param\":\"" + me.esc_json(catch_param) + "\"" wrote = 1 }
|
||
if catch_type != null && catch_type.length() > 0 { if wrote == 1 { entry = entry + "," } entry = entry + "\"typeHint\":\"" + me.esc_json(catch_type) + "\"" wrote = 1 }
|
||
local body_json = c_res.substring(0, atc)
|
||
if wrote == 1 { entry = entry + "," }
|
||
entry = entry + "\"body\":" + body_json + "}"
|
||
if catch_first == 0 { catches_json = catches_json + "," + entry } else { catches_json = catches_json + entry catch_first = 0 }
|
||
}
|
||
} else { cont_ct = 0 }
|
||
}
|
||
catches_json = catches_json + "]"
|
||
// optional finally
|
||
j = me.skip_ws(src, j)
|
||
local finally_json = null
|
||
if me.starts_with_kw(src, j, "finally") == 1 {
|
||
j = j + 7
|
||
j = me.skip_ws(src, j)
|
||
local f_res = me.parse_block2(src, j)
|
||
local atf = f_res.lastIndexOf("@")
|
||
j = me.to_int(f_res.substring(atf+1, f_res.length()))
|
||
finally_json = f_res.substring(0, atf)
|
||
}
|
||
if me.stage3_enabled() == 1 {
|
||
if j <= stmt_start { if j < src.length() { j = j + 1 } else { j = src.length() } }
|
||
me.gpos_set(j)
|
||
local node = "{\"type\":\"Try\",\"try\":" + try_json + ",\"catches\":" + catches_json
|
||
if finally_json != null { node = node + ",\"finally\":" + finally_json }
|
||
node = node + "}"
|
||
return node
|
||
}
|
||
if j <= stmt_start { if j < src.length() { j = j + 1 } else { j = src.length() } }
|
||
me.gpos_set(j)
|
||
return "{\"type\":\"Expr\",\"expr\":{\"type\":\"Int\",\"value\":0}}"
|
||
}
|
||
// Fallback: expression or unknown token — ensure progress even on malformed input
|
||
local expr_start = j
|
||
local e = me.parse_expr2(src, j)
|
||
j = me.gpos_get()
|
||
if j <= expr_start { if j < src.length() { j = j + 1 } else { j = src.length() } }
|
||
me.gpos_set(j)
|
||
return "{\"type\":\"Expr\",\"expr\":" + e + "}"
|
||
}
|
||
parse_block2(src, i) {
|
||
local j = me.skip_ws(src, i)
|
||
if src.substring(j, j+1) != "{" { return "[]@" + me.i2s(j) }
|
||
j = j + 1
|
||
local body = "["
|
||
local first = 1
|
||
local cont_block = 1
|
||
loop(cont_block == 1) {
|
||
j = me.skip_ws(src, j)
|
||
if j >= src.length() { cont_block = 0 } else {
|
||
if src.substring(j, j+1) == "}" { j = j + 1 cont_block = 0 } else {
|
||
local start_j = j
|
||
local s = me.parse_stmt2(src, j)
|
||
j = me.gpos_get()
|
||
// Progress guard: ensure forward movement to avoid infinite loop on malformed input
|
||
if j <= start_j {
|
||
if j < src.length() { j = j + 1 } else { j = src.length() }
|
||
me.gpos_set(j)
|
||
}
|
||
// consume optional semicolons (ASI minimal)
|
||
local done = 0
|
||
local guard = 0
|
||
local max = 100000
|
||
loop(done == 0) {
|
||
if guard > max { done = 1 } else { guard = guard + 1 }
|
||
local before = j
|
||
j = me.skip_ws(src, j)
|
||
if j < src.length() && src.substring(j, j+1) == ";" { j = j + 1 } else { done = 1 }
|
||
if j == before { done = 1 }
|
||
}
|
||
if s.length() > 0 { if first == 1 { body = body + s first = 0 } else { body = body + "," + s } }
|
||
}
|
||
}
|
||
}
|
||
body = body + "]"
|
||
return body + "@" + me.i2s(j)
|
||
}
|
||
parse_program2(src) {
|
||
local i = me.skip_ws(src, 0)
|
||
local body = "["
|
||
local first = 1
|
||
local cont_prog = 1
|
||
loop(cont_prog == 1) {
|
||
i = me.skip_ws(src, i)
|
||
if i >= src.length() { cont_prog = 0 } else {
|
||
local start_i = i
|
||
local s = me.parse_stmt2(src, i)
|
||
i = me.gpos_get()
|
||
// Progress guard: ensure forward movement to avoid infinite loop on malformed input
|
||
if i <= start_i {
|
||
if i < src.length() { i = i + 1 } else { i = src.length() }
|
||
me.gpos_set(i)
|
||
}
|
||
// consume optional semicolons between top-level statements
|
||
local done2 = 0
|
||
local guard2 = 0
|
||
local max2 = 100000
|
||
loop(done2 == 0) {
|
||
if guard2 > max2 { done2 = 1 } else { guard2 = guard2 + 1 }
|
||
local before2 = i
|
||
i = me.skip_ws(src, i)
|
||
if i < src.length() && src.substring(i, i+1) == ";" { i = i + 1 } else { done2 = 1 }
|
||
if i == before2 { done2 = 1 }
|
||
}
|
||
if s.length() > 0 { if first == 1 { body = body + s first = 0 } else { body = body + "," + s } }
|
||
}
|
||
}
|
||
body = body + "]"
|
||
return "{\"version\":0,\"kind\":\"Program\",\"body\":" + body + "}"
|
||
}
|
||
}
|
||
|
||
static box ParserStub { main(args) { return 0 } }
|