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pyroboros.html
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<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8>
</head>
<body>
Python PEP484 source:
<br><textarea id=e_src style='width:100vw;'>
def splitn(string: str, delim: str, max_splits: int) -> List[str]:
splits: List[str] = []
string_begin: int = 0
for i in range(max_splits):
split_begin: int = string.find(delim, string_begin)
if split_begin == -1: break
splits.append(string[string_begin : split_begin])
string_begin = split_begin + len(delim)
splits.append(string[string_begin:])
return splits
</textarea>
<br>Outputs
<br><textarea id=e_output_order cols=20 rows=10>
pep484
py
js
cpp
rust
</textarea>
<br><input type=button id=e_compile value=Compile>
<hr>
<ul id=e_outputs>
</ul>
<script>
function auto_height(e) {
e.style.height = 'auto';
e.style.height = (e.scrollHeight) + 'px';
}
auto_height(e_src)
const TRANSLATE = {};
TRANSLATE['pep484'] = function (src, root) {
// Tadaaaa...
return `\
from typing import *
${src}`;
};
const NEST_END_BY_BEGIN = {
'(': ')',
'[': ']',
'{': '}',
'<': '>',
'#': '\n',
'\'': '\'',
'"': '"',
'`': '`',
};
function count_repeats(s, d) {
let i;
for (i = 0; i < s.length; i += d.length) {
if (!s.startsWith(d, i)) break;
}
return i;
}
function find_next_unnested(s, d, begin) {
begin = begin || 0;
const end_stack = [];
for (let i = begin; i < s.length; i++) {
if (end_stack.length) {
const top = end_stack[end_stack.length-1];
if (s.startsWith(top, i)) {
if (top == '\n') {
i -= 1;
}
end_stack.pop();
}
continue;
}
if (s.startsWith(d, i)) {
return i;
}
const c = s[i];
let end = NEST_END_BY_BEGIN[c];
if (end) {
if (c == end) { // For block quotes
const repeats = count_repeats(s, c, i);
if (repeats >= 3) {
end = s.slice(i, i+repeats);
i += end.length - 1;
}
}
end_stack.push(end);
}
}
return -1;
}
console.assert((was = find_next_unnested('def a(b:c):', ':')) == 10, was);
function split_once_unnested(s, d, begin) {
begin = begin || 0;
const pos = find_next_unnested(s, d, begin);
let ret;
if (pos == -1) {
ret = [s];
} else {
ret = [
s.substr(begin, pos-begin),
s.substr(pos+d.length),
];
}
//console.log('split_once_unnested', {s, d, begin, ret});
return ret;
}
function splitOnce(s, d, begin) {
begin = begin || 0;
const pos = s.indexOf(d, begin);
if (pos == -1) {
return [s];
}
return [
s.substr(begin, pos-begin),
s.substr(pos+d.length),
];
}
function parse_var_decl(s) {
let [name, type] = splitOnce(s, ':');
return new ParseDecl(name.trim(), type.trim());
}
function ParseDecl(name, type) {
this.name = name;
this.type = type;
}
function parse_def(s) {
const RE_DEF = /^ *def +(.+?)\((.*?)\) *->(.+?):/s;
let [match, name, args_str, ret_type] = s.match(RE_DEF);
name = name.trim();
ret_type = ret_type.trim();
let args = [];
{
let pos = 0;
while (pos < args_str.length) {
let sep = find_next_unnested(args_str, ',', pos);
if (sep == -1) break;
args.push(args_str.substr(pos, sep-pos).trim());
pos = sep + 1;
}
args.push(args_str.substr(pos).trim());
}
args = args.map(a => parse_var_decl(a));
return new ParseDef(name, args, ret_type);
}
function ParseDef(name, args, ret_type) {
this.name = name;
this.args = args;
this.ret_type = ret_type;
}
function index_of(s, d, pos) {
return s.indexOf(d, pos);
}
function substr_until(s, d, begin, fn) {
fn = fn || index_of;
const end = fn(s, d, begin);
if (end == -1) return s;
return s.substr(begin, end - begin);
}
function line_col(s, pos) {
let line_num = 1;
let line_begin = 0;
while (true) {
const newline = s.indexOf('\n', line_begin);
if (newline == -1 || newline >= pos) break;
line_num += 1;
line_begin = newline+1;
}
return {
line: line_num,
col: pos - line_begin,
};
}
function line_pos_info(s, pos, info) {
const line_info = line_col(s, pos);
const line_start = pos - line_info.col;
const line = substr_until(s, '\n', line_start);
const arrow_line = '-'.repeat(line_info.col) + '^';
return `L${line_info.line}:${line_info.col}: ${info}
${line}
${arrow_line}`;
}
function ParseBlock(prev_level) {
this.prev_level = prev_level;
this.level = -1;
this.statements = [];
}
function ParseCommment(comment) {
this.comment = comment;
}
function parse_condition(cond) {
let [cmd, expr] = split_once_unnested(cond, ' ');
expr = parse_expr(expr);
return new ParseCondition(cmd, expr);
}
function ParseCondition(cmd, expr) {
this.cmd = cmd;
this.expr = expr;
}
function ParseFor(ident, expr) {
this.ident = ident;
this.expr = expr;
}
function parse_expr(text) {
return new ParseExpr(text.trim());
}
function ParseExpr(text) {
this.text = text;
}
function ParseAssign(left, right) {
this.left = left;
this.right = right;
}
function ParseNewline() {
}
// -
function parse(s) {
const block_stack = [new ParseBlock()];
let this_block = block_stack[0];
for (let line_begin = 0; line_begin < s.length; ) {
let pos = line_begin;
try{
let line = substr_until(s, '\n', line_begin, find_next_unnested);
console.log('|', line);
line_begin += line.length + 1;
// Handle indentation level
const without_indents = line.trimStart();
if (!without_indents.length) {
this_block.statements.push(new ParseNewline());
continue;
}
const line_level = line.length - without_indents.length;
line = without_indents;
pos += line_level;
if (this_block.level != -1) {
// Must be at this level or lower.
while (line_level < this_block.level) {
// Pop
block_stack.pop();
this_block = block_stack[block_stack.length-1];
}
if (line_level > this_block.level) throw line_pos_info(s, pos, 'Unexpected indent.');
} else {
if (line_level <= this_block.prev_level) throw line_pos_info(s, pos, 'Expected indent.');
this_block.level = line_level;
}
// Handle EOL comment
let comment_begin = find_next_unnested(line, '#');
let comment = null;
if (comment_begin != -1) {
// Absorb preceeding spaces to retain alignment
while (comment_begin >= 1 && line[comment_begin-1] == ' ') {
comment_begin -= 1;
}
const comment_str = line.substr(comment_begin);
comment = new ParseComment(comment_str);
line = line.substr(comment_begin).trimEnd();
}
/*
// Drop optional semicolon
if (line.endsWith(';')) {
if (line.endsWith(':;')) throw line_pos_info(s, pos, 'Unexpected indent.');
line = line.substr(0, line.length-1);
}
*/
// Directives. At worst e.g. "if 1: 2; return 3"
// But don't match "foo: int"!
let directive = null;
let expr = null;
if (line.startsWith('def ')) {
directive = parse_def(line);
let def_str;
[def_str, line] = split_once_unnested(line, ':');
line = line || '';
pos += def_str.length + 1;
} else if (line.startsWith('for ')) {
// "for I in RANGE(N)"
// "for I in RANGE(A,B)"
// "for V in LIST/SET"
// "for K in DICT"
// "for (K,V) in DICT.items()"
line = line.substr(4);
pos += 4;
let ident, iterable;
[ident, line] = splitOnce(line, ' in ');
if (!line) throw line_pos_info(s, pos, '`for` missing ` in `.');
pos += ident.length + 4;
[iterable, line] = split_once_unnested(line, ':');
line = line || '';
pos += iterable.length + 1;
directive = new ParseFor(ident, parse_expr(iterable));
} else if (line.startsWith('while ') ||
line.startsWith('if ') ||
line.startsWith('elif ')) {
[cond, line] = split_once_unnested(line, ':');
line = line || '';
pos += cond.length+1;
directive = parse_condition(cond);
} else if (line.startsWith('else')) {
// Don't match "elseval: int = 4;"
// Do match "else : 1;"
const [a, b] = split_once_unnested(line, ':');
if (a.trim() == 'else') {
statement = new ParseElse();
const len = a.length+1;
line = line.substr(len);
pos += len;
}
} else {
// expression or "ident: type" or "a: b; c: d"...
}
if (directive) {
this_block.statements.push(directive);
this_block = directive.block = new ParseBlock(line_level);
block_stack.push(this_block);
}
// Statement(s)
// E.g. 1; 2; 3
let is_inline_directive = false;
while (line.length) {
is_inline_directive = !!directive;
const cur = substr_until(line, ';', 0, find_next_unnested);
// "a = b = 3" ok, but forbid
// "a:int = b = 3" bad
// "a = b:int = 3" bad
// "a:int, b:int" ok, but forbid
// "a:b" ok
// "a = c" ok
// "a:b = c" ok
let [ab,c] = split_once_unnested(cur, '=');
let [a, b] = split_once_unnested(ab, ':');
if (b) {
ab = parse_var_decl(ab);
} else {
ab = parse_expr(a);
}
if (c) {
c = parse_expr(c);
this_block.statements.push(new ParseAssign(ab, c));
} else {
this_block.statements.push(ab);
}
const len = cur.length+1;
line = line.substr(len);
pos += len;
}
// End directive block if inline
if (is_inline_directive) {
block_stack.pop();
this_block = block_stack[block_stack.length-1];
}
// We're done!
if (line != line.trim()) throw line_pos_info(s, pos, 'Unexpected tokens at end of line.');
if (comment) {
this_block.statements.push(comment);
}
this_block.statements.push(new ParseNewline());
} catch (e) {
console.error({block_stack}, line_pos_info(s, pos, 'Incoming exception...'));
throw e;
}
}
return block_stack[0];
}
TRANSLATE['py'] = function (src, root) {
const out = [];
function for_expr(expr) {
out.push(expr.text);
}
function maybe_indent(level) {
if (level > 0 && out[out.length-1] == '\n') {
out.push(' '.repeat(level));
}
}
function for_block(info, block) {
//console.log('for_block', {info, block});
for (const s of block.statements) {
//console.log(s.constructor.name, s);
switch (s.constructor.name) {
case 'ParseNewline':
out.push('\n');
break;
case 'ParseComment':
out.push(s.comment);
break;
case 'ParseAssign':
maybe_indent(block.level);
switch (s.left.constructor.name) {
case 'ParseDecl':
out.push(s.left.name);
break;
case 'ParseExpr':
for_expr(s.left);
break;
default:
throw s.left.constructor.name;
}
if (s.right) {
out.push(' = ');
for_expr(s.right);
}
break;
case 'ParseExpr':
maybe_indent(block.level);
//console.log('ParseExpr', s.text);
for_expr(s);
break;
case 'ParseDecl':
maybe_indent(block.level);
out.push(name);
break;
case 'ParseDef':
maybe_indent(block.level);
out.push('def ', s.name, '(');
for (const arg of s.args) {
out.push(arg.name);
}
out.push('): '); // Poor guy is sad without a static type!
for_block('def', s.block);
break;
case 'ParseFor':
maybe_indent(block.level);
out.push('for ', s.ident, ' in ');
for_expr(s.expr);
out.push(': ');
for_block('for', s.block);
break;
case 'ParseCondition':
maybe_indent(block.level);
out.push(s.cmd, ' ');
for_expr(s.expr);
out.push(': ');
for_block(s.cmd, s.block);
break;
case 'ParseElse':
maybe_indent(block.level);
out.push('else: ');
for_block('else', s.block);
break;
default:
throw s.constructor.name;
}
}
//console.log('~for_block', {info, block});
}
for_block('root', root);
return out.join('');
};
function compile() {
const src = e_src.textContent;
const root = parse(src);
console.log({root});
const output_langs = e_output_order.textContent.trim().split('\n');
while (e_outputs.firstChild) { e_outputs.removeChild(e_outputs.firstChild); }
for (const lang of output_langs) {
const li = e_outputs.appendChild(document.createElement('li'));
const details = li.appendChild(document.createElement('details'));
details.open = true;
const summary = details.appendChild(document.createElement('summary'));
summary.textContent = `-> ${lang}:`;
const pre = details.appendChild(document.createElement('pre'));
pre.style.backgroundColor = '#eee';
let out;
try {
let fn = TRANSLATE[lang];
if (!fn) {
out = 'TODO: ' + lang;
} else {
out = TRANSLATE[lang](src, root);
}
} catch (e) {
out = e;
throw e;
}
pre.textContent = out;
}
}
compile();
</script>
</body>
</html>