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// SPDX-License-Identifier: MPL-2.0
// (c) Hare authors <https://harelang.org>
use fmt;
use vNEXT::ast;
use vNEXT::lex;
use io;
use memio;
use strings;
// Unparses a [[hare::ast::decl]].
export fn decl(
out: io::handle,
syn: *synfunc,
d: *ast::decl,
) (size | io::error) = {
let n = 0z;
let ctx = context {
out = out,
stack = &stack {
cur = d,
...
},
...
};
if (len(d.docs) > 0) {
n += comment(&ctx, syn, d.docs)?;
};
if (d.exported) {
n += syn(&ctx, "export", synkind::KEYWORD)?;
n += space(&ctx)?;
};
match (d.decl) {
case let c: []ast::decl_const =>
n += syn(&ctx, "def", synkind::KEYWORD)?;
n += space(&ctx)?;
for (let i = 0z; i < len(c); i += 1) {
n += _ident(&ctx, syn, c[i].ident, synkind::CONSTANT)?;
match (c[i]._type) {
case null => void;
case let ty: *ast::_type =>
n += syn(&ctx, ":", synkind::PUNCTUATION)?;
n += space(&ctx)?;
n += __type(&ctx, syn, ty)?;
};
n += space(&ctx)?;
n += syn(&ctx, "=", synkind::OPERATOR)?;
n += space(&ctx)?;
n += _expr(&ctx, syn, c[i].init)?;
if (i + 1 < len(c)) {
n += syn(&ctx, ",", synkind::PUNCTUATION)?;
n += space(&ctx)?;
};
};
case let g: []ast::decl_global =>
n += syn(&ctx,
if (g[0].is_const) "const" else "let",
synkind::KEYWORD)?;
n += space(&ctx)?;
for (let i = 0z; i < len(g); i += 1) {
if (len(g[i].symbol) != 0) {
n += syn(&ctx, "@symbol(", synkind::ATTRIBUTE)?;
n += literal(&ctx, syn, g[i].symbol)?;
n += syn(&ctx, ")", synkind::ATTRIBUTE)?;
n += space(&ctx)?;
} else if (g[i].is_threadlocal) {
n += syn(&ctx, "@threadlocal",
synkind::ATTRIBUTE)?;
n += space(&ctx)?;
};
n += _ident(&ctx, syn, g[i].ident, synkind::GLOBAL)?;
match (g[i]._type) {
case null => void;
case let ty: *ast::_type =>
n += syn(&ctx, ":", synkind::PUNCTUATION)?;
n += space(&ctx)?;
n += __type(&ctx, syn, ty)?;
};
match (g[i].init) {
case null => void;
case let ex: *ast::expr =>
n += space(&ctx)?;
n += syn(&ctx, "=", synkind::OPERATOR)?;
n += space(&ctx)?;
n += _expr(&ctx, syn, ex)?;
};
if (i + 1 < len(g)) {
n += syn(&ctx, ",", synkind::OPERATOR)?;
n += space(&ctx)?;
};
};
case let t: []ast::decl_type =>
n += syn(&ctx, "type", synkind::KEYWORD)?;
n += space(&ctx)?;
for (let i = 0z; i < len(t); i += 1) {
n += _ident(&ctx, syn, t[i].ident, synkind::TYPEDEF)?;
n += space(&ctx)?;
n += syn(&ctx, "=", synkind::OPERATOR)?;
n += space(&ctx)?;
n += __type(&ctx, syn, t[i]._type)?;
if (i + 1 < len(t)) {
n += syn(&ctx, ",", synkind::PUNCTUATION)?;
n += space(&ctx)?;
};
};
case let f: ast::decl_func =>
ctx.stack = &stack {
cur = f.prototype,
up = ctx.stack,
...
};
defer {
let stack = &(ctx.stack as *stack);
match (stack.extra) {
case let p: *opaque =>
free(p);
case null => void;
};
ctx.stack = stack.up;
};
switch (f.attrs) {
case ast::fndecl_attr::NONE => void;
case ast::fndecl_attr::FINI =>
n += syn(&ctx, "@fini", synkind::ATTRIBUTE)?;
n += space(&ctx)?;
case ast::fndecl_attr::INIT =>
n += syn(&ctx, "@init", synkind::ATTRIBUTE)?;
n += space(&ctx)?;
case ast::fndecl_attr::TEST =>
n += syn(&ctx, "@test", synkind::ATTRIBUTE)?;
n += space(&ctx)?;
};
let p = f.prototype.repr as ast::func_type;
if (len(f.symbol) != 0) {
n += syn(&ctx, "@symbol(", synkind::ATTRIBUTE)?;
n += literal(&ctx, syn, f.symbol)?;
n += syn(&ctx, ")", synkind::ATTRIBUTE)?;
n += space(&ctx)?;
};
n += syn(&ctx, "fn", synkind::KEYWORD)?;
n += space(&ctx)?;
n += _ident(&ctx, syn, f.ident, synkind::FUNCTION)?;
const fntype = f.prototype.repr as ast::func_type;
n += prototype(&ctx, syn, &fntype)?;
match (f.body) {
case null => void;
case let e: *ast::expr =>
n += space(&ctx)?;
n += syn(&ctx, "=", synkind::OPERATOR)?;
n += space(&ctx)?;
n += _expr(&ctx, syn, e)?;
};
case let e: ast::assert_expr =>
n += assert_expr(&ctx, syn, &e)?;
};
n += syn(&ctx, ";", synkind::PUNCTUATION)?;
return n;
};
fn comment(ctx: *context, syn: *synfunc, s: str) (size | io::error) = {
let n = 0z;
let s = strings::trimsuffix(s, "\n");
let s = strings::tokenize(s, "\n");
for (let line => strings::next_token(&s)) {
for (let i = 0z; i < ctx.indent; i += 1) {
n += syn(ctx, "\t", synkind::COMMENT)?;
ctx.linelen += 8;
};
n += syn(ctx, "//", synkind::COMMENT)?;
n += syn(ctx, line, synkind::COMMENT)?;
n += syn(ctx, "\n", synkind::COMMENT)?;
ctx.linelen = 0;
};
return n;
};
fn decl_test(d: *ast::decl, expected: str) bool = {
let buf = memio::dynamic();
decl(&buf, &syn_nowrap, d)!;
let s = memio::string(&buf)!;
defer free(s);
fmt::println(s)!;
return s == expected;
};
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