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use crate::gen::block::Block;
use crate::gen::builtin::Builtins;
use crate::gen::include::Includes;
use crate::gen::Opt;
use crate::syntax::namespace::Namespace;
use crate::syntax::Types;
use std::cell::RefCell;
use std::fmt::{self, Arguments, Write};
pub(crate) struct OutFile<'a> {
pub header: bool,
pub opt: &'a Opt,
pub types: &'a Types<'a>,
pub include: Includes<'a>,
pub builtin: Builtins<'a>,
content: RefCell<Content<'a>>,
}
#[derive(Default)]
pub struct Content<'a> {
bytes: String,
namespace: &'a Namespace,
blocks: Vec<BlockBoundary<'a>>,
section_pending: bool,
blocks_pending: usize,
}
#[derive(Copy, Clone, PartialEq, Debug)]
enum BlockBoundary<'a> {
Begin(Block<'a>),
End(Block<'a>),
}
impl<'a> OutFile<'a> {
pub fn new(header: bool, opt: &'a Opt, types: &'a Types) -> Self {
OutFile {
header,
opt,
types,
include: Includes::new(),
builtin: Builtins::new(),
content: RefCell::new(Content::new()),
}
}
// Write a blank line if the preceding section had any contents.
pub fn next_section(&mut self) {
self.content.get_mut().next_section();
}
pub fn begin_block(&mut self, block: Block<'a>) {
self.content.get_mut().begin_block(block);
}
pub fn end_block(&mut self, block: Block<'a>) {
self.content.get_mut().end_block(block);
}
pub fn set_namespace(&mut self, namespace: &'a Namespace) {
self.content.get_mut().set_namespace(namespace);
}
pub fn write_fmt(&self, args: Arguments) {
let content = &mut *self.content.borrow_mut();
Write::write_fmt(content, args).unwrap();
}
pub fn content(&mut self) -> Vec<u8> {
self.flush();
let include = &self.include.content.bytes;
let builtin = &self.builtin.content.bytes;
let content = &self.content.get_mut().bytes;
let len = include.len() + builtin.len() + content.len() + 2;
let mut out = String::with_capacity(len);
out.push_str(include);
if !out.is_empty() && !builtin.is_empty() {
out.push('\n');
}
out.push_str(builtin);
if !out.is_empty() && !content.is_empty() {
out.push('\n');
}
out.push_str(content);
if out.is_empty() {
out.push_str("// empty\n");
}
out.into_bytes()
}
fn flush(&mut self) {
self.include.content.flush();
self.builtin.content.flush();
self.content.get_mut().flush();
}
}
impl<'a> Write for Content<'a> {
fn write_str(&mut self, s: &str) -> fmt::Result {
self.write(s);
Ok(())
}
}
impl<'a> PartialEq for Content<'a> {
fn eq(&self, _other: &Self) -> bool {
true
}
}
impl<'a> Content<'a> {
fn new() -> Self {
Content::default()
}
pub fn next_section(&mut self) {
self.section_pending = true;
}
pub fn begin_block(&mut self, block: Block<'a>) {
self.push_block_boundary(BlockBoundary::Begin(block));
}
pub fn end_block(&mut self, block: Block<'a>) {
self.push_block_boundary(BlockBoundary::End(block));
}
pub fn set_namespace(&mut self, namespace: &'a Namespace) {
for name in self.namespace.iter().rev() {
self.end_block(Block::UserDefinedNamespace(name));
}
for name in namespace {
self.begin_block(Block::UserDefinedNamespace(name));
}
self.namespace = namespace;
}
pub fn write_fmt(&mut self, args: Arguments) {
Write::write_fmt(self, args).unwrap();
}
fn write(&mut self, b: &str) {
if !b.is_empty() {
if self.blocks_pending > 0 {
self.flush_blocks();
}
if self.section_pending && !self.bytes.is_empty() {
self.bytes.push('\n');
}
self.bytes.push_str(b);
self.section_pending = false;
self.blocks_pending = 0;
}
}
fn push_block_boundary(&mut self, boundary: BlockBoundary<'a>) {
if self.blocks_pending > 0 && boundary == self.blocks.last().unwrap().rev() {
self.blocks.pop();
self.blocks_pending -= 1;
} else {
self.blocks.push(boundary);
self.blocks_pending += 1;
}
}
fn flush(&mut self) {
self.set_namespace(Default::default());
if self.blocks_pending > 0 {
self.flush_blocks();
}
}
fn flush_blocks(&mut self) {
self.section_pending = !self.bytes.is_empty();
let mut read = self.blocks.len() - self.blocks_pending;
let mut write = read;
while read < self.blocks.len() {
match self.blocks[read] {
BlockBoundary::Begin(begin_block) => {
if self.section_pending {
self.bytes.push('\n');
self.section_pending = false;
}
Block::write_begin(begin_block, &mut self.bytes);
self.blocks[write] = BlockBoundary::Begin(begin_block);
write += 1;
}
BlockBoundary::End(end_block) => {
write = write.checked_sub(1).unwrap();
let begin_block = self.blocks[write];
assert_eq!(begin_block, BlockBoundary::Begin(end_block));
Block::write_end(end_block, &mut self.bytes);
self.section_pending = true;
}
}
read += 1;
}
self.blocks.truncate(write);
}
}
impl<'a> BlockBoundary<'a> {
fn rev(self) -> BlockBoundary<'a> {
match self {
BlockBoundary::Begin(block) => BlockBoundary::End(block),
BlockBoundary::End(block) => BlockBoundary::Begin(block),
}
}
}
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