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|
include 'expr.lm'
context fspec
enum_counter:int
void enum_inc() { enum_counter = enum_counter + 1 }
void enum_set(v:int) { enum_counter = v }
int enum_get() { return enum_counter }
context primitive
token TYPE_SIGN / [us] /
token TYPE_BITS / [1-9][0-9]* /
int strtoull(a:str, b:int) = c_strtoull
def type
signed:bool
bits:int
[TYPE_SIGN TYPE_BITS] {
lhs.signed = ($r1 == 's')
lhs.bits = strtoull($r2, 10)
}
end
context container
context enum
lex
ignore / '//' [^\n]* '\n' | space+ /
literal `= `, `{ `}
end
literal `enum
int
const_int_expr(expr:collapser::collapsed) {
if (!expr || !expr.result.value || !expr.result.value.number) reject
return expr.result.value.number.value
}
def declaration
value:int
[name:reference::variable::type `= expr::enum::type] { lhs.value = const_int_expr(r3.collapsed) enum_set(lhs.value) enum_inc() }
| [name:reference::variable::type] { lhs.value = enum_get() enum_inc() }
def item
[decl:declaration `, item] | [decl:declaration]
def type
name:str
items:item+
select:expr::paren::type
[type:`enum WS+ reference::variable::type? `{ item+ `}] {
for n:reference::variable::type in child(r3) lhs.name = $n
lhs.items = r5
enum_set(0)
}
end
context strukt
lex
ignore / '//' [^\n]* '\n' | space+ /
literal `{ `}
end
literal `struct
def item
[data:declaration::type]
def type
name:str
items:item+
select:expr::paren::type
[type:`struct WS+ reference::variable::type? `{ item+ `}] {
for n:reference::variable::type in child(r3) lhs.name = $n
lhs.items = r5
}
end
context select
lex
ignore / '//' [^\n]* '\n' | space+ /
literal `( `) `{ `} `*
end
literal `select
def item
[`* `) data:declaration::type]
| [expr:expr::paren::type `) data:declaration::type]
def type
name:str
items:item+
select:expr::paren::type
[type:`select `( expr::paren::type `) `{ item+ `}] { lhs.select = r3 lhs.items = r6 }
end
def type
[data:enum::type] | [data:strukt::type] | [data:select::type]
end
context declaration
lex
ignore / '//' [^\n]* '\n' | space+ /
literal `: `[ `] `| `;
token VISUAL / 'nul' | 'dec' | 'hex' | 'str' /
end
literal `enum `struct
def visual
[name:VISUAL]
def filter
[`| function:reference::function::type]
def subscript
[`[ expr:expr::bracket::type `: slice:expr::bracket::type `]]
| [`[ expr:expr::bracket::type `]]
def extra
length:collapser::collapsed
[subscript:subscript* filter:filter* visual:visual?] {
f:str = ''
has_slice:bool
for l:subscript in repeat(r1) {
if (l.slice) {
f = ''
has_slice = true
break
}
if (f != '')
f = f + '*'
if (l.expr.collapsed.result.value) {
f = f + '(' + $l.expr.collapsed.result.value + ')'
} else {
f = f + '(' + $l.expr.collapsed + ')'
}
}
if (f == '' && !has_slice)
f = '1'
if (f != '')
lhs.length = collapser::stream(f)
}
def type
[cref:`enum WS+ parent:reference::variable::type WS+ primitive:primitive::type WS+ name:reference::variable::type extra:extra `;]
| [cref:`struct WS+ parent:reference::variable::type WS+ name:reference::variable::type extra:extra `;]
| [primitive:primitive::type WS+ name:reference::variable::type extra:extra `;]
| [container::select::type extra `;] commit { reject }
| [container::select::type primitive::type WS+ reference::variable::type extra `;] commit { reject }
| [container::strukt::type primitive::type WS+ reference::variable::type extra `;] commit { reject }
| [container:container::type primitive:primitive::type WS+ name:reference::variable::type extra:extra `;]
| [container:container::type name:reference::variable::type extra:extra `;]
| [container:container::type filter:filter* `;]
end
def source
[items:declaration::type*] commit
source
stream(s:stream)
{
c:fspec = new fspec()
c->enum_counter = 0
return parse source(c)[s]
}
end
source:fspec::source = fspec::stream(stdin)
if (!source) {
print(error)
exit(1)
}
struct scope
names:map<str, map<str, any>>
end
global g_scopes:list<scope> = new list<scope>()
void
push_scope() {
s:scope = new scope()
s->names = new map<str, map<str, any>>()
g_scopes->push_head(s)
}
void
pop_scope()
{
g_scopes->pop_head()
}
any
lookup_no_error(type:str, name:str) {
for s:scope in g_scopes {
cmap:map<str, any> = s->names->find(type)
if (cmap) {
var:any = cmap->find(name)
if (var)
return var
}
}
return nil
}
any
insert(type:str, name:str, var:any)
{
if (!name)
return var
if (type != 'variable' && lookup_no_error(type, name)) {
print('`', type, ' ', name, '` is already declared as a `', type, '` in current scope!\n')
exit(1)
}
cmap:map<str, any> = g_scopes->top->names->find(type)
if (!cmap) {
cmap = new map<str, any>()
} else if (cmap->find(name)) {
print('`', type, ' ', name, '` is already declared as a `', type, '` in current scope!\n')
exit(1)
}
cmap->insert(name, var)
g_scopes->top->names->insert(type, cmap)
return var
}
any
lookup(type:str, name:str)
{
r:any = lookup_no_error(type, name)
if (!r) {
print('`', type, ' ', name, '` is not declared in this or outer scope!\n')
exit(1)
}
return r
}
str
container_name_str(s:str) { if (!s) return '<anon>' return s }
str
signed_str(s:bool) { if (s) return 'signed' return 'unsigned' }
global INDSTP:str = 'â '
void
print_declaration(d:fspec::declaration::type, ind:str)
{
insert('variable', $d.name, d)
print(ind, 'variable `', $d.name, "` that's ")
c:fspec::container::type
if (d.cref) c = lookup($d.cref, $d.parent) else c = d.container
if (c) {
print('`', c.data.type, ' ', container_name_str(c.data.name), '` ')
if (c.data.select)
print('with expression `', $c.data.select, '` ')
}
if (d.primitive)
print(d.primitive.bits, ' bits and ', signed_str(d.primitive.signed))
print('\n')
if (d.extra) {
if (d.extra.length) {
if (!d.extra.length.result.value || d.extra.length.result.value.reference) {
print(ind, INDSTP, 'it has a variable length that needs to be computed with formula `', $d.extra.length, '`\n')
} else {
if (d.extra.length.result.value.number) {
print(ind, INDSTP, 'it has a constant length of ', $d.extra.length.result.value, '\n')
} else if (d.extra.length.result.value.string) {
print(ind, INDSTP, ' its length will increase until pattern `', d.extra.length.result.value.string.escaped, '` has been read from stream\n')
}
}
} else {
print(ind, INDSTP, 'the subscripts contain slices, and thus needs some runtime loops to be computed\n')
}
for f:fspec::declaration::filter in repeat(d.extra.filter)
print(ind, INDSTP, 'it needs to be filtered with `', $f.function, '`\n')
for v:fspec::declaration::visual in child(d.extra.visual)
print(ind, INDSTP, 'it should be visualized as `', $v.name, '`\n')
}
}
void
walk(d:fspec::declaration::type, ind:str)
{
if (!d.container) {
print('something went wrong!\n')
exit(1)
}
s:fspec::container::type = d.container
insert($s.data.type, s.data.name, s)
if (d.name) {
print_declaration(d, ind)
ind = ind + INDSTP
print(ind, 'and it contains\n')
} else {
print(ind, 'container `', s.data.type, ' ', container_name_str(s.data.name), '`')
if ($d.filter != '') {
print('\n')
ind = ind + INDSTP
for f:fspec::declaration::filter in repeat(d.filter)
print(ind, 'it needs to be filtered with `', $f.function, '`\n')
print(ind, 'and it contains\n')
} else {
print(' that contains\n')
}
}
if ($s.data.type == 'enum') {
for i:fspec::container::enum::item in repeat(s.data.items) {
print(ind, INDSTP, 'constant `', $i.decl.name, '` which value is ', $i.decl.value, '\n')
insert('variable', $i.decl.name, i)
}
} else if ($s.data.type == 'struct') {
push_scope()
for i:fspec::container::strukt::item in repeat(s.data.items) {
if (i.data.container)
walk(i.data, ind + INDSTP)
else
print_declaration(i.data, ind + INDSTP)
}
pop_scope()
} else if ($s.data.type == 'select') {
ind = ind + INDSTP
push_scope()
for i:fspec::container::select::item in repeat(s.data.items) {
if (i.expr)
print(ind, 'in case of (', $i.expr, ')\n')
else
print(ind, 'or otherwise\n')
if (i.data.container)
walk(i.data, ind + INDSTP)
else
print_declaration(i.data, ind + INDSTP)
}
pop_scope()
}
}
push_scope()
for d:fspec::declaration::type in repeat(source.items)
walk(d, '')
pop_scope()
|