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printer.rs
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/
printer.rs
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//! Print (or serialize) IR to human and machine readable text.
//!
//! This module implements a document based pretty-printer. A couple of 3rd party pretty printing
//! crates were assessed but didn't seem to work as well as this simple version, which is quite
//! effective.
use std::collections::{BTreeMap, HashMap};
use crate::{
asm::*,
block::Block,
constant::{Constant, ConstantValue},
context::Context,
function::{Function, FunctionContent},
instruction::{Instruction, Predicate, Register},
irtype::Type,
metadata::{MetadataIndex, Metadatum},
module::{Kind, ModuleContent},
value::{Value, ValueContent, ValueDatum},
BinaryOpKind, BlockArgument,
};
#[derive(Debug)]
enum Doc {
Empty,
Space,
Comma,
Text(String),
Line(Box<Doc>),
Pair(Box<Doc>, Box<Doc>),
List(Vec<Doc>),
ListSep(Vec<Doc>, Box<Doc>),
Parens(Box<Doc>),
Indent(i64, Box<Doc>),
}
impl Doc {
fn text<S: Into<String>>(s: S) -> Self {
Doc::Text(s.into())
}
fn line(doc: Doc) -> Self {
Doc::Line(Box::new(doc))
}
fn text_line<S: Into<String>>(s: S) -> Self {
Doc::Line(Box::new(Doc::Text(s.into())))
}
fn indent(n: i64, doc: Doc) -> Doc {
Doc::Indent(n, Box::new(doc))
}
fn list_sep(docs: Vec<Doc>, sep: Doc) -> Doc {
Doc::ListSep(docs, Box::new(sep))
}
fn in_parens_comma_sep(docs: Vec<Doc>) -> Doc {
Doc::Parens(Box::new(Doc::list_sep(docs, Doc::Comma)))
}
fn append(self, doc: Doc) -> Doc {
match (&self, &doc) {
(Doc::Empty, _) => doc,
(_, Doc::Empty) => self,
_ => Doc::Pair(Box::new(self), Box::new(doc)),
}
}
fn and(self, doc: Doc) -> Doc {
match doc {
Doc::Empty => doc,
_ => Doc::Pair(Box::new(self), Box::new(doc)),
}
}
fn build(self) -> String {
build_doc(self, 0)
}
}
/// Pretty-print a whole [`Context`] to a string.
///
/// The ouput from this function must always be suitable for [`crate::parser::parse`].
pub fn to_string(context: &Context) -> String {
let mut md_namer = MetadataNamer::default();
context
.modules
.iter()
.fold(Doc::Empty, |doc, (_, module)| {
doc.append(module_to_doc(context, &mut md_namer, module))
})
.append(md_namer.to_doc(context))
.build()
}
fn module_to_doc<'a>(
context: &'a Context,
md_namer: &mut MetadataNamer,
module: &'a ModuleContent,
) -> Doc {
Doc::line(Doc::Text(format!(
"{} {{",
match module.kind {
Kind::Contract => "contract",
Kind::Library => "library",
Kind::Predicate => "predicate ",
Kind::Script => "script",
}
)))
.append(Doc::indent(
4,
Doc::list_sep(
module
.functions
.iter()
.map(|function| {
function_to_doc(
context,
md_namer,
&mut Namer::new(*function),
&context.functions[function.0],
)
})
.collect(),
Doc::line(Doc::Empty),
),
))
.append(Doc::text_line("}"))
}
fn function_to_doc<'a>(
context: &'a Context,
md_namer: &mut MetadataNamer,
namer: &mut Namer,
function: &'a FunctionContent,
) -> Doc {
Doc::line(
Doc::text(format!(
"{}fn {}",
if function.is_public { "pub " } else { "" },
function.name,
))
.append(
function
.selector
.map(|bytes| {
Doc::text(format!(
"<{:02x}{:02x}{:02x}{:02x}>",
bytes[0], bytes[1], bytes[2], bytes[3]
))
})
.unwrap_or(Doc::Empty),
)
.append(Doc::in_parens_comma_sep(
function
.arguments
.iter()
.map(|(name, arg_val)| {
if let ValueContent {
value: ValueDatum::Argument(BlockArgument { ty, .. }),
metadata,
..
} = &context.values[arg_val.0]
{
Doc::text(name)
.append(
Doc::Space.and(md_namer.md_idx_to_doc_no_comma(context, metadata)),
)
.append(Doc::text(format!(": {}", ty.as_string(context))))
} else {
unreachable!("Unexpected non argument value for function arguments.")
}
})
.collect(),
))
.append(Doc::text(format!(
" -> {}",
function.return_type.as_string(context)
)))
.append(md_namer.md_idx_to_doc(context, &function.metadata))
.append(Doc::text(" {")),
)
.append(Doc::indent(
4,
Doc::list_sep(
vec![
Doc::List(
function
.local_storage
.iter()
.map(|(name, ptr)| {
let ptr_content = &context.pointers[ptr.0];
let init_doc = match &ptr_content.initializer {
Some(const_val) => Doc::text(format!(
" = const {}",
const_val.as_lit_string(context)
)),
None => Doc::Empty,
};
Doc::line(
Doc::text(format!("local {}", ptr.as_string(context, Some(name))))
.append(init_doc),
)
})
.collect(),
),
Doc::list_sep(
function
.blocks
.iter()
.map(|block| block_to_doc(context, md_namer, namer, block))
.collect(),
Doc::line(Doc::Empty),
),
],
Doc::line(Doc::Empty),
),
))
.append(Doc::text_line("}"))
}
fn block_to_doc<'a>(
context: &'a Context,
md_namer: &mut MetadataNamer,
namer: &mut Namer,
block: &Block,
) -> Doc {
let block_content = &context.blocks[block.0];
Doc::line(
Doc::text(block_content.label.to_string()).append(
Doc::in_parens_comma_sep(
block
.arg_iter(context)
.map(|arg_val| {
Doc::text(namer.name(context, arg_val)).append(Doc::text(format!(
": {}",
arg_val.get_type(context).unwrap().as_string(context)
)))
})
.collect(),
)
.append(Doc::Text(":".to_string())),
),
)
.append(Doc::List(
block_content
.instructions
.iter()
.map(|ins| instruction_to_doc(context, md_namer, namer, block, ins))
.collect(),
))
}
fn constant_to_doc(
context: &Context,
md_namer: &mut MetadataNamer,
namer: &mut Namer,
const_val: &Value,
) -> Doc {
if let ValueContent {
value: ValueDatum::Constant(constant),
metadata,
} = &context.values[const_val.0]
{
Doc::line(
Doc::text(format!(
"{} = const {}",
namer.name(context, const_val),
constant.as_lit_string(context)
))
.append(md_namer.md_idx_to_doc(context, metadata)),
)
} else {
unreachable!("Not a constant value.")
}
}
fn maybe_constant_to_doc(
context: &Context,
md_namer: &mut MetadataNamer,
namer: &mut Namer,
maybe_const_val: &Value,
) -> Doc {
// Create a new doc only if value is new and unknown, and is a constant.
if !namer.is_known(maybe_const_val) && maybe_const_val.is_constant(context) {
constant_to_doc(context, md_namer, namer, maybe_const_val)
} else {
Doc::Empty
}
}
fn instruction_to_doc<'a>(
context: &'a Context,
md_namer: &mut MetadataNamer,
namer: &mut Namer,
block: &Block,
ins_value: &'a Value,
) -> Doc {
if let ValueContent {
value: ValueDatum::Instruction(instruction),
metadata,
} = &context.values[ins_value.0]
{
match instruction {
Instruction::AsmBlock(asm, args) => {
asm_block_to_doc(context, md_namer, namer, ins_value, asm, args, metadata)
}
Instruction::AddrOf(value) => maybe_constant_to_doc(context, md_namer, namer, value)
.append(
Doc::text_line(format!(
"{} = addr_of {}",
namer.name(context, ins_value),
namer.name(context, value),
))
.append(md_namer.md_idx_to_doc(context, metadata)),
),
Instruction::BitCast(value, ty) => {
maybe_constant_to_doc(context, md_namer, namer, value).append(Doc::line(
Doc::text(format!(
"{} = bitcast {} to {}",
namer.name(context, ins_value),
namer.name(context, value),
ty.as_string(context),
))
.append(md_namer.md_idx_to_doc(context, metadata)),
))
}
Instruction::BinaryOp { op, arg1, arg2 } => {
let op_str = match op {
BinaryOpKind::Add => "add",
BinaryOpKind::Sub => "sub",
BinaryOpKind::Mul => "mul",
BinaryOpKind::Div => "div",
};
maybe_constant_to_doc(context, md_namer, namer, arg1)
.append(maybe_constant_to_doc(context, md_namer, namer, arg2))
.append(Doc::line(
Doc::text(format!(
"{} = {op_str} {}, {}",
namer.name(context, ins_value),
namer.name(context, arg1),
namer.name(context, arg2),
))
.append(md_namer.md_idx_to_doc(context, metadata)),
))
}
Instruction::Branch(to_block) =>
// Handle possibly constant block parameters
{
to_block
.args
.iter()
.fold(Doc::Empty, |doc, param| {
doc.append(maybe_constant_to_doc(context, md_namer, namer, param))
})
.append(Doc::line(
Doc::text(format!("br {}", context.blocks[to_block.block.0].label,))
.append(
Doc::in_parens_comma_sep(
to_block
.args
.iter()
.map(|arg_val| Doc::text(namer.name(context, arg_val)))
.collect(),
)
.append(md_namer.md_idx_to_doc(context, metadata)),
),
))
}
Instruction::Call(func, args) => args
.iter()
.fold(Doc::Empty, |doc, arg_val| {
doc.append(maybe_constant_to_doc(context, md_namer, namer, arg_val))
})
.append(Doc::line(
Doc::text(format!(
"{} = call {}",
namer.name(context, ins_value),
context.functions[func.0].name
))
.append(Doc::in_parens_comma_sep(
args.iter()
.map(|arg_val| Doc::text(namer.name(context, arg_val)))
.collect(),
))
.append(md_namer.md_idx_to_doc(context, metadata)),
)),
Instruction::Cmp(pred, lhs_value, rhs_value) => {
let pred_str = match pred {
Predicate::Equal => "eq",
};
maybe_constant_to_doc(context, md_namer, namer, lhs_value)
.append(maybe_constant_to_doc(context, md_namer, namer, rhs_value))
.append(Doc::line(
Doc::text(format!(
"{} = cmp {pred_str} {} {}",
namer.name(context, ins_value),
namer.name(context, lhs_value),
namer.name(context, rhs_value),
))
.append(md_namer.md_idx_to_doc(context, metadata)),
))
}
Instruction::ConditionalBranch {
cond_value,
true_block,
false_block,
} => {
let true_label = &context.blocks[true_block.block.0].label;
let false_label = &context.blocks[false_block.block.0].label;
// Handle possibly constant block parameters
let doc = true_block.args.iter().fold(
maybe_constant_to_doc(context, md_namer, namer, cond_value),
|doc, param| doc.append(maybe_constant_to_doc(context, md_namer, namer, param)),
);
let doc = false_block.args.iter().fold(doc, |doc, param| {
doc.append(maybe_constant_to_doc(context, md_namer, namer, param))
});
doc.append(Doc::line(
Doc::text(format!("cbr {}", namer.name(context, cond_value),)).append(
Doc::text(format!(", {true_label}")).append(
Doc::in_parens_comma_sep(
true_block
.args
.iter()
.map(|arg_val| Doc::text(namer.name(context, arg_val)))
.collect(),
)
.append(
Doc::text(format!(", {false_label}")).append(
Doc::in_parens_comma_sep(
false_block
.args
.iter()
.map(|arg_val| Doc::text(namer.name(context, arg_val)))
.collect(),
)
.append(md_namer.md_idx_to_doc(context, metadata)),
),
),
),
),
))
}
Instruction::ContractCall {
return_type,
name,
params,
coins,
asset_id,
gas,
} => maybe_constant_to_doc(context, md_namer, namer, coins)
.append(maybe_constant_to_doc(context, md_namer, namer, asset_id))
.append(maybe_constant_to_doc(context, md_namer, namer, gas))
.append(Doc::line(
Doc::text(format!(
"{} = contract_call {} {} {}, {}, {}, {}",
namer.name(context, ins_value),
return_type.as_string(context),
name,
namer.name(context, params),
namer.name(context, coins),
namer.name(context, asset_id),
namer.name(context, gas),
))
.append(md_namer.md_idx_to_doc(context, metadata)),
)),
Instruction::ExtractElement {
array,
ty,
index_val,
} => maybe_constant_to_doc(context, md_namer, namer, index_val).append(Doc::line(
Doc::text(format!(
"{} = extract_element {}, {}, {}",
namer.name(context, ins_value),
namer.name(context, array),
Type::Array(*ty).as_string(context),
namer.name(context, index_val),
))
.append(md_namer.md_idx_to_doc(context, metadata)),
)),
Instruction::ExtractValue {
aggregate,
ty,
indices,
} => maybe_constant_to_doc(context, md_namer, namer, aggregate).append(Doc::line(
Doc::text(format!(
"{} = extract_value {}, {}, ",
namer.name(context, ins_value),
namer.name(context, aggregate),
Type::Struct(*ty).as_string(context),
))
.append(Doc::list_sep(
indices
.iter()
.map(|idx| Doc::text(format!("{idx}")))
.collect(),
Doc::Comma,
))
.append(md_namer.md_idx_to_doc(context, metadata)),
)),
Instruction::GetStorageKey => Doc::line(
Doc::text(format!(
"{} = get_storage_key",
namer.name(context, ins_value),
))
.append(md_namer.md_idx_to_doc(context, metadata)),
),
Instruction::Gtf { index, tx_field_id } => {
maybe_constant_to_doc(context, md_namer, namer, index).append(Doc::line(
Doc::text(format!(
"{} = gtf {}, {}",
namer.name(context, ins_value),
namer.name(context, index),
tx_field_id,
))
.append(md_namer.md_idx_to_doc(context, metadata)),
))
}
Instruction::GetPointer {
base_ptr,
ptr_ty,
offset,
} => {
let name = block
.get_function(context)
.lookup_local_name(context, base_ptr)
.unwrap();
Doc::line(
Doc::text(format!(
"{} = get_ptr {}, {}, {}",
namer.name(context, ins_value),
base_ptr.as_string(context, Some(name)),
ptr_ty.as_string(context, None),
offset,
))
.append(md_namer.md_idx_to_doc(context, metadata)),
)
}
Instruction::InsertElement {
array,
ty,
value,
index_val,
} => maybe_constant_to_doc(context, md_namer, namer, array)
.append(maybe_constant_to_doc(context, md_namer, namer, value))
.append(maybe_constant_to_doc(context, md_namer, namer, index_val))
.append(Doc::line(
Doc::text(format!(
"{} = insert_element {}, {}, {}, {}",
namer.name(context, ins_value),
namer.name(context, array),
Type::Array(*ty).as_string(context),
namer.name(context, value),
namer.name(context, index_val),
))
.append(md_namer.md_idx_to_doc(context, metadata)),
)),
Instruction::InsertValue {
aggregate,
ty,
value,
indices,
} => maybe_constant_to_doc(context, md_namer, namer, aggregate)
.append(maybe_constant_to_doc(context, md_namer, namer, value))
.append(Doc::line(
Doc::text(format!(
"{} = insert_value {}, {}, {}, ",
namer.name(context, ins_value),
namer.name(context, aggregate),
Type::Struct(*ty).as_string(context),
namer.name(context, value),
))
.append(Doc::list_sep(
indices
.iter()
.map(|idx| Doc::text(format!("{idx}")))
.collect(),
Doc::Comma,
))
.append(md_namer.md_idx_to_doc(context, metadata)),
)),
Instruction::IntToPtr(value, ty) => {
maybe_constant_to_doc(context, md_namer, namer, value).append(Doc::line(
Doc::text(format!(
"{} = int_to_ptr {} to {}",
namer.name(context, ins_value),
namer.name(context, value),
ty.as_string(context),
))
.append(md_namer.md_idx_to_doc(context, metadata)),
))
}
Instruction::Load(src_value) => Doc::line(
Doc::text(format!(
"{} = load ptr {}",
namer.name(context, ins_value),
namer.name(context, src_value),
))
.append(md_namer.md_idx_to_doc(context, metadata)),
),
Instruction::Log {
log_val,
log_ty,
log_id,
} => maybe_constant_to_doc(context, md_namer, namer, log_val)
.append(maybe_constant_to_doc(context, md_namer, namer, log_id))
.append(Doc::line(
Doc::text(format!(
"log {} {}, {}",
log_ty.as_string(context),
namer.name(context, log_val),
namer.name(context, log_id),
))
.append(md_namer.md_idx_to_doc(context, metadata)),
)),
Instruction::Nop => Doc::line(
Doc::text(format!("{} = nop", namer.name(context, ins_value)))
.append(md_namer.md_idx_to_doc(context, metadata)),
),
Instruction::ReadRegister(reg) => Doc::line(
Doc::text(format!(
"{} = read_register {}",
namer.name(context, ins_value),
match reg {
Register::Of => "of",
Register::Pc => "pc",
Register::Ssp => "ssp",
Register::Sp => "sp",
Register::Fp => "fp",
Register::Hp => "hp",
Register::Error => "err",
Register::Ggas => "ggas",
Register::Cgas => "cgas",
Register::Bal => "bal",
Register::Is => "is",
Register::Ret => "ret",
Register::Retl => "retl",
Register::Flag => "flag",
},
))
.append(md_namer.md_idx_to_doc(context, metadata)),
),
Instruction::Ret(v, t) => {
maybe_constant_to_doc(context, md_namer, namer, v).append(Doc::line(
Doc::text(format!(
"ret {} {}",
t.as_string(context),
namer.name(context, v),
))
.append(md_namer.md_idx_to_doc(context, metadata)),
))
}
Instruction::Revert(v) => {
maybe_constant_to_doc(context, md_namer, namer, v).append(Doc::line(
Doc::text(format!("revert {}", namer.name(context, v),))
.append(md_namer.md_idx_to_doc(context, metadata)),
))
}
Instruction::StateLoadQuadWord { load_val, key } => Doc::line(
Doc::text(format!(
"state_load_quad_word ptr {}, key ptr {}",
namer.name(context, load_val),
namer.name(context, key),
))
.append(md_namer.md_idx_to_doc(context, metadata)),
),
Instruction::StateLoadWord(key) => Doc::line(
Doc::text(format!(
"{} = state_load_word key ptr {}",
namer.name(context, ins_value),
namer.name(context, key),
))
.append(md_namer.md_idx_to_doc(context, metadata)),
),
Instruction::StateStoreQuadWord { stored_val, key } => Doc::line(
Doc::text(format!(
"state_store_quad_word ptr {}, key ptr {}",
namer.name(context, stored_val),
namer.name(context, key),
))
.append(md_namer.md_idx_to_doc(context, metadata)),
),
Instruction::StateStoreWord { stored_val, key } => {
maybe_constant_to_doc(context, md_namer, namer, stored_val).append(Doc::line(
Doc::text(format!(
"state_store_word {}, key ptr {}",
namer.name(context, stored_val),
namer.name(context, key),
))
.append(md_namer.md_idx_to_doc(context, metadata)),
))
}
Instruction::Store {
dst_val,
stored_val,
} => maybe_constant_to_doc(context, md_namer, namer, stored_val).append(Doc::line(
Doc::text(format!(
"store {}, ptr {}",
namer.name(context, stored_val),
namer.name(context, dst_val),
))
.append(md_namer.md_idx_to_doc(context, metadata)),
)),
}
} else {
unreachable!("Unexpected non instruction for block contents.")
}
}
fn asm_block_to_doc(
context: &Context,
md_namer: &mut MetadataNamer,
namer: &mut Namer,
ins_value: &Value,
asm: &AsmBlock,
args: &[AsmArg],
metadata: &Option<MetadataIndex>,
) -> Doc {
let AsmBlockContent {
body,
return_type,
return_name,
..
} = &context.asm_blocks[asm.0];
args.iter()
.fold(
Doc::Empty,
|doc, AsmArg { initializer, .. }| match initializer {
Some(init_val) if init_val.is_constant(context) => {
doc.append(constant_to_doc(context, md_namer, namer, init_val))
}
_otherwise => doc,
},
)
.append(Doc::line(
Doc::text(format!("{} = asm", namer.name(context, ins_value)))
.append(Doc::in_parens_comma_sep(
args.iter()
.map(|AsmArg { name, initializer }| {
Doc::text(name.as_str()).append(match initializer {
Some(init_val) => {
Doc::text(format!(": {}", namer.name(context, init_val)))
}
None => Doc::Empty,
})
})
.collect(),
))
.append(
return_name
.as_ref()
.map(|rn| {
Doc::text(format!(" -> {} {rn}", return_type.as_string(context)))
.append(md_namer.md_idx_to_doc(context, metadata))
})
.unwrap_or(Doc::Empty),
)
.append(Doc::text(" {")),
))
.append(Doc::indent(
4,
Doc::List(
body.iter()
.map(
|AsmInstruction {
name,
args,
immediate,
metadata,
}| {
Doc::line(
Doc::text(format!("{:6} ", name.as_str())).append(
Doc::list_sep(
args.iter().map(|arg| Doc::text(arg.as_str())).collect(),
Doc::text(" "),
)
.append(match immediate {
Some(imm_str) => Doc::text(format!(" {imm_str}")),
None => Doc::Empty,
})
.append(md_namer.md_idx_to_doc(context, metadata)),
),
)
},
)
.collect(),
),
))
.append(Doc::text_line("}"))
}
impl Constant {
fn as_lit_string(&self, context: &Context) -> String {
match &self.value {
ConstantValue::Undef => format!("{} undef", self.ty.as_string(context)),
ConstantValue::Unit => "unit ()".into(),
ConstantValue::Bool(b) => format!("bool {}", if *b { "true" } else { "false" }),
ConstantValue::Uint(v) => format!("{} {}", self.ty.as_string(context), v),
ConstantValue::B256(bs) => format!(
"b256 0x{}",
bs.iter()
.map(|b| format!("{b:02x}"))
.collect::<Vec<String>>()
.concat()
),
ConstantValue::String(bs) => format!(
"{} \"{}\"",
self.ty.as_string(context),
bs.iter()
.map(
|b| if b.is_ascii() && !b.is_ascii_control() && *b != b'\\' && *b != b'"' {
format!("{}", *b as char)
} else {
format!("\\x{b:02x}")
}
)
.collect::<Vec<_>>()
.join("")
),
ConstantValue::Array(elems) => format!(
"{} [{}]",
self.ty.as_string(context),
elems
.iter()
.map(|elem| elem.as_lit_string(context))
.collect::<Vec<String>>()
.join(", ")
),
ConstantValue::Struct(fields) => format!(
"{} {{ {} }}",
self.ty.as_string(context),
fields
.iter()
.map(|field| field.as_lit_string(context))
.collect::<Vec<String>>()
.join(", ")
),
}
}
}
struct Namer {
function: Function,
names: HashMap<Value, String>,
next_value_idx: u64,
}
impl Namer {
fn new(function: Function) -> Self {
Namer {
function,
names: HashMap::new(),
next_value_idx: 0,
}
}
fn name(&mut self, context: &Context, value: &Value) -> String {
match &context.values[value.0].value {
ValueDatum::Argument(_) => self
.function
.lookup_arg_name(context, value)
.cloned()
.unwrap_or_else(|| self.default_name(value)),
ValueDatum::Constant(_) => self.default_name(value),
ValueDatum::Instruction(_) => self.default_name(value),
}
}
fn default_name(&mut self, value: &Value) -> String {
self.names.get(value).cloned().unwrap_or_else(|| {
let new_name = format!("v{}", self.next_value_idx);
self.next_value_idx += 1;
self.names.insert(*value, new_name.clone());
new_name
})
}
fn is_known(&self, value: &Value) -> bool {
self.names.contains_key(value)
}
}
#[derive(Default)]
struct MetadataNamer {
md_map: BTreeMap<MetadataIndex, u64>,
next_md_idx: u64,
}
impl MetadataNamer {
fn values_sorted(&self) -> impl Iterator<Item = (u64, MetadataIndex)> {
let mut items = self
.md_map
.clone()
.into_iter()
.map(|(a, b)| (b, a))
.collect::<Vec<_>>();
items.sort_unstable();
items.into_iter()
}
fn get(&self, md_idx: &MetadataIndex) -> Option<u64> {
self.md_map.get(md_idx).copied()
}
// This method is how we introduce 'valid' metadata to the namer, as only valid metadata are
// printed at the end. Since metadata are stored globally to the context there may be a bunch
// in there which aren't relevant (e.g., library code). Hopefully this will go away when the
// Sway compiler becomes properly modular and eschews all the inlining it does.
//
// So, we insert a reference index into the namer whenever we see a new metadata index passed
// here. But we also need to recursively 'validate' any other metadata referred to, e.g., list
// elements, struct members, etc. It's done in `add_md_idx()` below.
fn md_idx_to_doc_no_comma(&mut self, context: &Context, md_idx: &Option<MetadataIndex>) -> Doc {
md_idx
.map(|md_idx| Doc::text(format!("!{}", self.add_md_idx(context, &md_idx))))
.unwrap_or(Doc::Empty)
}
fn md_idx_to_doc(&mut self, context: &Context, md_idx: &Option<MetadataIndex>) -> Doc {
Doc::Comma.and(self.md_idx_to_doc_no_comma(context, md_idx))
}
fn add_md_idx(&mut self, context: &Context, md_idx: &MetadataIndex) -> u64 {
self.md_map.get(md_idx).copied().unwrap_or_else(|| {
// Recurse for all sub-metadata here first to be sure they can be referenced later.
self.add_md(context, &context.metadata[md_idx.0]);
// Create a new index mapping.
let new_idx = self.next_md_idx;
self.next_md_idx += 1;
self.md_map.insert(*md_idx, new_idx);
new_idx
})
}
fn add_md(&mut self, context: &Context, md: &Metadatum) {
match md {
Metadatum::Integer(_) | Metadatum::String(_) => (),
Metadatum::Index(idx) => {
let _ = self.add_md_idx(context, idx);
}
Metadatum::Struct(_tag, els) => {
for el in els {
self.add_md(context, el);
}
}
Metadatum::List(idcs) => {
for idx in idcs {
self.add_md_idx(context, idx);
}
}
}
}
fn to_doc(&self, context: &Context) -> Doc {
fn md_to_string(context: &Context, md_namer: &MetadataNamer, md: &Metadatum) -> String {
match md {
Metadatum::Integer(i) => i.to_string(),
Metadatum::Index(idx) => format!(
"!{}",
md_namer
.get(idx)
.unwrap_or_else(|| panic!("Metadata index ({idx:?}) not found in namer."))
),
Metadatum::String(s) => format!("{s:?}"),
Metadatum::Struct(tag, els) => {
format!(
"{tag} {}",
els.iter()
.map(|el_md| md_to_string(context, md_namer, el_md))
.collect::<Vec<_>>()
.join(" ")
)
}
Metadatum::List(idcs) => {
format!(
"({})",
idcs.iter()
.map(|idx| format!(
"!{}",
md_namer.get(idx).unwrap_or_else(|| panic!(
"Metadata list index ({idx:?}) not found in namer."
))
))
.collect::<Vec<_>>()
.join(" ")
)
}
}
}
let md_lines = self