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hako(parser): add index operator support

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- ParserExprBox: support postfix [expr] and lower to Method(recv, "get", [index])
- ParserStmtBox: support index assignment IDENT [expr] = expr → Expr(Method(recv, "set", [idx, val]))
- Note: lowering uses existing Method → MIR emit path (int args). Phase‑1 canaries use int indices/values.
This commit is contained in:
nyash-codex
2025-10-31 20:22:43 +09:00
parent 5e3d9e7ae4
commit dbc285f2b1
2 changed files with 38 additions and 3 deletions
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11
lang/src/compiler/parser/expr/parser_expr_box.hako
View File

@ -168,6 +168,16 @@ static box ParserExprBox {
k = ctx.skip_ws(src, k)
if src.substring(k, k+1) == ")" { k = k + 1 }
node = "{\"type\":\"Method\",\"recv\":" + node + ",\"method\":\"" + mname + "\",\"args\":" + args_json2 + "}"
} else if tch == "[" {
// Index access: node[ index ] → Method(recv=node, method="get", args=[index])
k = k + 1
k = ctx.skip_ws(src, k)
local idx_json = ctx.parse_expr2(src, k)
k = ctx.gpos_get()
k = ctx.skip_ws(src, k)
if src.substring(k, k+1) == "]" { k = k + 1 }
local args_idx = "[" + idx_json + "]"
node = "{\\\"type\\\":\\\"Method\\\",\\\"recv\\\":" + node + ",\\\"method\\\":\\\"get\\\",\\\"args\\\":" + args_idx + "}"
} else {
cont2 = 0
}
@ -352,4 +362,3 @@ static box ParserExprBox {
return out + "@" + ctx.i2s(j)
}
}

30
lang/src/compiler/parser/stmt/parser_stmt_box.hako
View File

@ -16,13 +16,40 @@ static box ParserStmtBox {
return me.parse_using(src, j, stmt_start, ctx)
}
// assignment: IDENT '=' expr
// assignment: IDENT '[' expr ']' '=' expr or IDENT '=' expr
if j < src.size() && ctx.is_alpha(src.substring(j, j+1)) {
local idp0 = ctx.read_ident2(src, j)
local at0 = idp0.lastIndexOf("@")
if at0 > 0 {
local name0 = idp0.substring(0, at0)
local k0 = ctx.to_int(idp0.substring(at0+1, idp0.size()))
// Case A: index assignment arr[expr] = value
{
local kA = ctx.skip_ws(src, k0)
if kA < src.size() && src.substring(kA, kA+1) == "[" {
kA = kA + 1
kA = ctx.skip_ws(src, kA)
// parse index expression
local idx_json = ctx.parse_expr2(src, kA)
kA = ctx.gpos_get()
kA = ctx.skip_ws(src, kA)
if kA < src.size() && src.substring(kA, kA+1) == "]" { kA = kA + 1 }
kA = ctx.skip_ws(src, kA)
if kA < src.size() && src.substring(kA, kA+1) == "=" {
// parse RHS
kA = kA + 1
kA = ctx.skip_ws(src, kA)
local rhs_json = ctx.parse_expr2(src, kA)
kA = ctx.gpos_get()
// Build Method set(name[idx], rhs) as Expr statement
local recv = "{\\\"type\\\":\\\"Var\\\",\\\"name\\\":\"" + name0 + "\"}"
local args = "[" + idx_json + "," + rhs_json + "]"
local method = "{\\\"type\\\":\\\"Method\\\",\\\"recv\\\":" + recv + ",\\\"method\\\":\\\"set\\\",\\\"args\\\":" + args + "}"
ctx.gpos_set(kA)
return "{\"type\":\"Expr\",\"expr\":" + method + "}"
}
}
}
k0 = ctx.skip_ws(src, k0)
if k0 < src.size() && src.substring(k0, k0+1) == "=" {
local eq_two = "="
@ -199,4 +226,3 @@ static box ParserStmtBox {
return ""
}
}