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Working in Rust with Parser.bind(&mut String)

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Garen Tyler 2020-11-29 16:43:38 -07:00
parent 7c8194633b
commit fed2aef6e4
17 changed files with 1005 additions and 575 deletions
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7
.gitignore vendored
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@ -1 +1,8 @@
/target
#Added by cargo
#
#already existing elements were commented out
#/target

117
Cargo.lock generated Normal file
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@ -0,0 +1,117 @@
# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
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"memchr",
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"cfg-if",
"ryu",
"static_assertions",
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"regex",
]
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"thread_local",
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11
Cargo.toml Normal file
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[package]
name = "pivot"
version = "0.1.0"
authors = ["Garen Tyler <garentyler@gmail.com>"]
edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
regex = "1.4.1"
nom = "5.1.2"

0
errors.txt
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10
output.s
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.global main
main:
push {fp, lr}
ldr r0, =1
cmp r0, #1
moveq r0, #'.'
movne r0, #'F'
bl putchar
mov r0, #0
pop {fp, pc}

20
package.json
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{
"name": "pivot",
"version": "1.0.0",
"description": "A programming language",
"main": "index.ts",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1",
"run": "deno run -c tsconfig.json --allow-read --allow-write --unstable src/index.ts"
},
"repository": {
"type": "git",
"url": "git+https://github.com/ElementG9/pivot.git"
},
"author": "Garen Tyler",
"license": "MIT",
"bugs": {
"url": "https://github.com/ElementG9/pivot/issues"
},
"homepage": "https://github.com/ElementG9/pivot#readme"
}

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src/ast.rs Normal file
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#[derive(Clone, Debug, PartialEq)]
pub enum AstNodeKind {
// Primitives
Integer,
Identifier,
// Unary operators
Not,
// Infix operators
NotEqual,
Equal,
Add,
Subtract,
Multiply,
Divide,
// Control flow
Block,
IfStatement,
WhileLoop,
Program,
// Functions and variables
FunctionCall,
FunctionReturn,
FunctionDefinition,
VariableDefinition,
Assign,
}
#[derive(Clone, Debug, PartialEq)]
pub struct AstNode {
pub kind: AstNodeKind,
pub value: String,
pub subnodes: Vec<AstNode>
}
impl AstNode {
pub fn new(kind: AstNodeKind, value: String, subnodes: Vec<AstNode>) -> AstNode {
AstNode {
kind,
value,
subnodes
}
}
pub fn emit(&self, f: &mut dyn std::fmt::Write) -> std::fmt::Result {
use AstNodeKind::*;
match self.kind {
Integer => write!(f, "i64.const {}\n", self.value),
Add => {
self.subnodes[0].emit(f)?;
self.subnodes[1].emit(f)?;
write!(f, "i64.add\n")
}
Program => {
write!(f, "(module\n")?;
for node in &self.subnodes {
node.emit(f);
}
write!(f, ")")
}
_ => Ok(())
}
}
// Primitives
pub fn integer(num: i64) -> AstNode {
AstNode {
kind: AstNodeKind::Integer,
value: num.to_string(),
subnodes: vec![],
}
}
pub fn identifier(id: String) -> AstNode {
AstNode {
kind: AstNodeKind::Identifier,
value: id,
subnodes: vec![],
}
}
// Unary operators
pub fn not(operand: AstNode) -> AstNode {
AstNode {
kind: AstNodeKind::Not,
value: "not".into(),
subnodes: vec![operand],
}
}
// Infix operators
pub fn not_equal(left: AstNode, right: AstNode) -> AstNode {
AstNode {
kind: AstNodeKind::NotEqual,
value: "not_equal".into(),
subnodes: vec![left, right]
}
}
pub fn equal(left: AstNode, right: AstNode) -> AstNode {
AstNode {
kind: AstNodeKind::Equal,
value: "equal".into(),
subnodes: vec![left, right]
}
}
pub fn add(left: AstNode, right: AstNode) -> AstNode {
AstNode {
kind: AstNodeKind::Add,
value: "add".into(),
subnodes: vec![left, right]
}
}
pub fn subtract(left: AstNode, right: AstNode) -> AstNode {
AstNode {
kind: AstNodeKind::Subtract,
value: "subtract".into(),
subnodes: vec![left, right]
}
}
pub fn multiply(left: AstNode, right: AstNode) -> AstNode {
AstNode {
kind: AstNodeKind::Multiply,
value: "multiply".into(),
subnodes: vec![left, right]
}
}
pub fn divide(left: AstNode, right: AstNode) -> AstNode {
AstNode {
kind: AstNodeKind::Divide,
value: "divide".into(),
subnodes: vec![left, right]
}
}
// Control flow
pub fn block(statements: Vec<AstNode>) -> AstNode {
AstNode {
kind: AstNodeKind::Block,
value: "block".into(),
subnodes: statements
}
}
pub fn if_statement(conditional: AstNode, consequence: AstNode, alternative: AstNode) -> AstNode {
AstNode {
kind: AstNodeKind::IfStatement,
value: "if_statement".into(),
subnodes: vec![conditional, consequence, alternative]
}
}
pub fn while_loop(conditional: AstNode, body: AstNode) -> AstNode {
AstNode {
kind: AstNodeKind::WhileLoop,
value: "while_loop".into(),
subnodes: vec![conditional, body],
}
}
pub fn program(statements: Vec<AstNode>) -> AstNode {
AstNode {
kind: AstNodeKind::Program,
value: "program".into(),
subnodes: statements
}
}
// Functions and variables
pub fn function_call(name: String, parameters: Vec<AstNode>) -> AstNode {
AstNode {
kind: AstNodeKind::FunctionCall,
value: name,
subnodes: parameters,
}
}
pub fn function_return(operand: AstNode) -> AstNode {
AstNode {
kind: AstNodeKind::FunctionReturn,
value: "return".into(),
subnodes: vec![operand],
}
}
pub fn function_definition(name: String, parameters: Vec<AstNode>, body: AstNode) -> AstNode {
let mut params = vec![body];
for p in parameters {
params.push(p);
}
AstNode {
kind: AstNodeKind::FunctionDefinition,
value: name,
subnodes: params,
}
}
pub fn variable_definition(name: String, value: AstNode) -> AstNode {
AstNode {
kind: AstNodeKind::VariableDefinition,
value: name,
subnodes: vec![value],
}
}
pub fn assign(name: String, value: AstNode) -> AstNode {
AstNode {
kind: AstNodeKind::Assign,
value: name,
subnodes: vec![value],
}
}
}

273
src/ast.ts
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import { emit } from './codegen.ts';
export interface AST {
emit(): void;
equals(other: AST): boolean;
}
// Number node.
export class Num implements AST {
constructor(public value: number) {}
emit() {
emit(` ldr r0, =${this.value}`);
}
equals(other: AST): boolean {
return other instanceof Num
&& this.value === other.value;
}
}
// Identifier node.
export class Id implements AST {
constructor(public value: string) {}
emit() {
throw Error('Not implemented yet');
}
equals(other: AST): boolean {
return other instanceof Id
&& this.value === other.value;
}
}
// Operator nodes.
export class Not implements AST {
constructor(public operand: AST) {}
emit() {
this.operand.emit();
emit(' cmp r0, #0');
emit(' moveq r0, #1');
emit(' movne r0, #0');
}
equals(other: AST): boolean {
return other instanceof Not
&& this.operand.equals(other.operand);
}
}
export abstract class Infix {
constructor(public left: AST, public right: AST) {}
emit() {
this.left.emit();
emit(' push {r0, ip}');
this.right.emit();
emit(' pop {r1, ip}');
}
}
export class Equal extends Infix implements AST {
constructor(public left: AST, public right: AST) {
super(left, right);
}
emit() {
super.emit();
emit(' cmp r0, r1');
emit(' moveq r0, #1');
emit(' movne r0, #0');
}
equals(other: AST): boolean {
return other instanceof Equal
&& this.left.equals(other.left)
&& this.right.equals(other.right);
}
}
export class NotEqual extends Infix implements AST {
constructor(public left: AST, public right: AST) {
super(left, right);
}
emit() {
super.emit();
emit(' cmp r0, r1');
emit(' moveq r0, #0');
emit(' movne r0, #1');
}
equals(other: AST): boolean {
return other instanceof NotEqual
&& this.left.equals(other.left)
&& this.right.equals(other.right);
}
}
export class Add extends Infix implements AST {
constructor(public left: AST, public right: AST) {
super(left, right);
}
emit() {
super.emit();
emit(' add r0, r0, r1');
}
equals(other: AST): boolean {
return other instanceof Add
&& this.left.equals(other.left)
&& this.right.equals(other.right);
}
}
export class Subtract extends Infix implements AST {
constructor(public left: AST, public right: AST) {
super(left, right);
}
emit() {
super.emit();
emit(' sub r0, r0, r1');
}
equals(other: AST): boolean {
return other instanceof Subtract
&& this.left.equals(other.left)
&& this.right.equals(other.right);
}
}
export class Multiply extends Infix implements AST {
constructor(public left: AST, public right: AST) {
super(left, right);
}
emit() {
super.emit();
emit(' mul r0, r0, r1');
}
equals(other: AST): boolean {
return other instanceof Multiply
&& this.left.equals(other.left)
&& this.right.equals(other.right);
}
}
export class Divide extends Infix implements AST {
constructor(public left: AST, public right: AST) {
super(left, right);
}
emit() {
super.emit();
emit(' udiv r0, r0, r1');
}
equals(other: AST): boolean {
return other instanceof Divide
&& this.left.equals(other.left)
&& this.right.equals(other.right);
}
}
// Function call node.
export class FunctionCall implements AST {
constructor(public callee: string, public args: Array<AST>) {}
emit() {
throw Error('Not implemented yet');
}
equals(other: AST): boolean {
return other instanceof FunctionCall
&& this.callee === other.callee
&& this.args.length === other.args.length
&& this.args.every((arg: AST, i: number) => arg.equals(other.args[i]));
}
}
// Return node.
export class Return implements AST {
constructor(public operand: AST) {}
emit() {
throw Error('Not implemented yet');
}
equals(other: AST): boolean {
return other instanceof Return
&& this.operand.equals(other.operand);
}
}
// Block node.
export class Block implements AST {
constructor(public statements: Array<AST>) {}
emit() {
this.statements.forEach((statement: any) => statement.emit());
}
equals(other: AST): boolean {
return other instanceof Block
&& this.statements.length === other.statements.length
&& this.statements.every((arg: AST, i: number) => arg.equals(other.statements[i]));
}
}
// If node.
export class If implements AST {
constructor(public conditional: AST,
public consequence: AST,
public alternative: AST) {}
emit() {
throw Error('Not implemented yet');
}
equals(other: AST): boolean {
return other instanceof If
&& this.conditional.equals(other.conditional)
&& this.consequence.equals(other.consequence)
&& this.alternative.equals(other.alternative);
}
}
// Function definition node.
export class FunctionDefinition implements AST {
constructor(public name: string,
public parameters: Array<string>,
public body: AST) {}
emit() {
throw Error(`Not implemented yet (${this.name})`);
}
equals(other: AST): boolean {
return other instanceof FunctionDefinition
&& this.name === other.name
&& this.parameters.length === other.parameters.length
&& this.parameters.every((arg: string, i: number) => arg === other.parameters[i])
&& this.body.equals(other.body);
}
}
// Variable declaration node.
export class VariableDeclaration implements AST {
constructor(public name: string, public value: AST) {}
emit() {
throw Error('Not implemented yet');
}
equals(other: AST): boolean {
return other instanceof VariableDeclaration
&& this.name === other.name
&& this.value.equals(other.value);
}
}
// Assignment node.
export class Assign implements AST {
constructor(public name: string, public value: AST) {}
emit() {
throw Error('Not implemented yet');
}
equals(other: AST): boolean {
return other instanceof Assign
&& this.name === other.name
&& this.value.equals(other.value);
}
}
// While loop node.
export class While implements AST {
constructor(public conditional: AST, public body: AST) {}
emit() {
throw Error('Not implemented yet');
}
equals(other: AST): boolean {
return other instanceof While
&& this.conditional.equals(other.conditional)
&& this.body.equals(other.body);
}
}
// Variable node.
export class Var implements AST {
constructor(public name: string, public value: AST) {}
emit() {
throw Error('Not implemented yet');
}
equals(other: AST): boolean {
return other instanceof Var
&& this.name === other.name
&& this.value.equals(other.value);
}
}

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src/ast_old.rs Normal file
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use std::fmt::Write;
#[derive(Debug, PartialEq)]
pub struct AstNode {
pub value: Option<String>,
pub kind: String,
pub subtokens: Option<Vec<AstNode>>,
}
impl std::fmt::Display for AstNode {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match &self.kind[..] {
"number" => write!(f, "{}", self.value.as_ref().expect("number had blank value")),
"identifier" => write!(f, "{}", self.value.as_ref().expect("number had blank value")),
"not" => write!(f, "!({})", self.subtokens.as_ref().expect("not had blank subtokens")[0]),
"equal" => write!(f, "({} == ({}))", self.subtokens.as_ref().expect("equal had blank subtokens")[0], self.subtokens.as_ref().expect("equal had blank subtokens")[1]),
"not_equal" => write!(f, "({} != {})", self.subtokens.as_ref().expect("not_equal had blank subtokens")[0], self.subtokens.as_ref().expect("not_equal had blank subtokens")[1]),
"add" => write!(f, "({} + {})", self.subtokens.as_ref().expect("add had blank subtokens")[0], self.subtokens.as_ref().expect("add had blank subtokens")[1]),
"subtract" => write!(f, "({} - {})", self.subtokens.as_ref().expect("subtract had blank subtokens")[0], self.subtokens.as_ref().expect("subtract had blank subtokens")[1]),
"multiply" => write!(f, "({} * {})", self.subtokens.as_ref().expect("multiply had blank subtokens")[0], self.subtokens.as_ref().expect("multiply had blank subtokens")[1]),
"divide" => write!(f, "({} / {})", self.subtokens.as_ref().expect("divide had blank subtokens")[0], self.subtokens.as_ref().expect("divide had blank subtokens")[1]),
"call" => {
write!(f, "({}(", self.value.as_ref().expect("call had blank value"))?;
let args = self.subtokens.as_ref().expect("call had blank subtokens");
if args.len() > 0 {
write!(f, "{}", args[0])?;
if args.len() > 1 {
for i in 1..args.len() {
write!(f, ", {}", args[i])?;
}
}
}
write!(f, "))")
},
"return" => write!(f, "return {}", self.subtokens.as_ref().expect("return had blank subtokens")[0]),
"block" => {
write!(f, "{{\n")?;
let stmts = self.subtokens.as_ref().expect("block had blank subtokens");
if stmts.len() > 0 {
write!(f, "{};", stmts[0])?;
if stmts.len() > 1 {
for i in 1..stmts.len() {
write!(f, "\n{};", stmts[i])?;
}
}
}
write!(f, "\n}}")
}
"if" => {
let parts = self.subtokens.as_ref().expect("if had blank subtokens");
write!(f, "(if ({}) {{{}}} else {{{}}})", parts[0], parts[1], parts[2])
}
"function" => {
let parts = self.subtokens.as_ref().expect("function had blank subtokens");
write!(f, "function {}(", self.value.as_ref().expect("function had blank value"))?;
let params = &parts[1..];
if params.len() > 0 {
write!(f, "{}", params[0])?;
if params.len() > 1 {
for i in 1..params.len() {
write!(f, ", {}", params[i])?;
}
}
}
write!(f, ") {}", parts[0])
}
"variable" => write!(f, "var {} = {}", self.value.as_ref().expect("var had blank value"), self.subtokens.as_ref().expect("var had blank subtokens")[0]),
"assign" => write!(f, "{} = {}", self.value.as_ref().expect("assign had blank value"), self.subtokens.as_ref().expect("assign had blank subtokens")[0]),
"while" => {
let parts = self.subtokens.as_ref().expect("while had blank subtokens");
write!(f, "while ({})\n{}\n", parts[0], parts[1])
}
"program" => {
write!(f, "{{\n")?;
let stmts = self.subtokens.as_ref().expect("program had blank subtokens");
if stmts.len() > 0 {
write!(f, "{};", stmts[0])?;
if stmts.len() > 1 {
for i in 1..stmts.len() {
write!(f, "\n{};", stmts[i])?;
}
}
}
write!(f, "\n}}")
}
_ => write!(f, "(unknown node type {})", self.kind),
}
}
}
impl AstNode {
pub fn emit(&self, f: &mut dyn Write) -> Result<(), std::fmt::Error> {
match &self.kind[..] {
"number" => write!(f, "i32.const {}\n", self.value.as_ref().expect("number had blank value")),
"add" => {
let subtokens = self.subtokens.as_ref().expect("add had blank subtokens");
subtokens[0].emit(f)?;
subtokens[1].emit(f)?;
write!(f, "i32.add\n")
},
_ => Ok(())
}
}
pub fn number(num: i32) -> AstNode {
AstNode {
value: Some(num.to_string()),
kind: "number".into(),
subtokens: None,
}
}
pub fn identifier<T: Into<String>>(id: T) -> AstNode {
AstNode {
value: Some(id.into()),
kind: "identifier".into(),
subtokens: None,
}
}
pub fn not(operand: AstNode) -> AstNode {
AstNode {
value: None,
kind: "not".into(),
subtokens: Some(vec![operand]),
}
}
pub fn equal(left: AstNode, right: AstNode) -> AstNode {
AstNode {
value: None,
kind: "equal".into(),
subtokens: Some(vec![left, right]),
}
}
pub fn not_equal(left: AstNode, right: AstNode) -> AstNode {
AstNode {
value: None,
kind: "not_equal".into(),
subtokens: Some(vec![left, right]),
}
}
pub fn add(left: AstNode, right: AstNode) -> AstNode {
AstNode {
value: None,
kind: "add".into(),
subtokens: Some(vec![left, right]),
}
}
pub fn subtract(left: AstNode, right: AstNode) -> AstNode {
AstNode {
value: None,
kind: "subtract".into(),
subtokens: Some(vec![left, right]),
}
}
pub fn multiply(left: AstNode, right: AstNode) -> AstNode {
AstNode {
value: None,
kind: "multiply".into(),
subtokens: Some(vec![left, right]),
}
}
pub fn divide(left: AstNode, right: AstNode) -> AstNode {
AstNode {
value: None,
kind: "divide".into(),
subtokens: Some(vec![left, right]),
}
}
pub fn call<T: Into<String>>(callee: T, args: Vec<AstNode>) -> AstNode {
AstNode {
value: Some(callee.into()),
kind: "call".into(),
subtokens: Some(args),
}
}
pub fn r#return(operand: AstNode) -> AstNode {
AstNode {
value: None,
kind: "return".into(),
subtokens: Some(vec![operand]),
}
}
pub fn block(statements: Vec<AstNode>) -> AstNode {
AstNode {
value: None,
kind: "block".into(),
subtokens: Some(statements),
}
}
pub fn r#if(conditional: AstNode, consequence: AstNode, alternative: AstNode) -> AstNode {
AstNode {
value: None,
kind: "if".into(),
subtokens: Some(vec![conditional, consequence, alternative]),
}
}
pub fn function<T: Into<String>>(name: T, parameters: Vec<(T, T)>, body: AstNode) -> AstNode {
// Turn the parameter strings into ids.
let mut params = vec![];
params.push(body); // First one will always be the body.
for p in parameters {
params.push(AstNode::identifier(p));
}
AstNode {
value: Some(name.into()),
kind: "function".into(),
subtokens: Some(params),
}
}
pub fn variable<T: Into<String>>(name: T, value: AstNode) -> AstNode {
AstNode {
value: Some(name.into()),
kind: "variable".into(),
subtokens: Some(vec![value]),
}
}
pub fn assign<T: Into<String>>(name: T, value: AstNode) -> AstNode {
AstNode {
value: Some(name.into()),
kind: "assign".into(),
subtokens: Some(vec![value]),
}
}
pub fn r#while(conditional: AstNode, body: AstNode) -> AstNode {
AstNode {
value: None,
kind: "while".into(),
subtokens: Some(vec![conditional, body]),
}
}
pub fn program(statements: Vec<AstNode>) -> AstNode {
AstNode {
value: None,
kind: "program".into(),
subtokens: Some(statements),
}
}
}

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import { AST } from './ast.ts';
import { existsSync } from 'https://deno.land/std/fs/mod.ts';
const outputFileName = '../output.s';
const outputToFile = false;
export async function emit(input: string) {
if (outputToFile) {
if (existsSync(outputFileName)) {
await Deno.remove(outputFileName);
}
await Deno.create(outputFileName);
const outputFile = await Deno.open(outputFileName, {
write: true,
append: true,
});
await Deno.write(outputFile.rid, new TextEncoder().encode(input));
} else {
console.log(input);
}
}
export class Main implements AST {
constructor(public statements: Array<AST>) {}
emit() {
emit('.global main');
emit('main:');
emit(' push {fp, lr}');
this.statements.forEach((statement: any) => statement.emit());
emit(' mov r0, #0');
emit(' pop {fp, pc}');
}
equals(other: AST): boolean {
return other instanceof Main
&& this.statements.length === other.statements.length
&& this.statements.every((arg: AST, i: number) => arg.equals(other.statements[i]));
}
}
export class Assert implements AST {
constructor(public condition: AST) {}
emit() {
this.condition.emit();
emit(' cmp r0, #1');
emit(` moveq r0, #'.'`);
emit(` movne r0, #'F'`);
emit(' bl putchar');
}
equals(other: AST): boolean {
return other instanceof Assert
&& this.condition.equals(other.condition);
}
}

10
src/index.ts
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import { parse } from './parser.ts';
let result = parse(`
function main() {
assert(1);
assert(!0);
}
`);
// console.log(JSON.stringify(result, null, 2));
result.emit();

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#[macro_use]
extern crate nom;
extern crate regex;
pub mod ast;
pub mod parse;

0
src/lib.ts
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use pivot::ast::AstNode;
use regex::Regex;
fn main() {
pivot::parse::parse();
// let src = AstNode::program(vec![
// AstNode::add(
// AstNode::integer(2),
// AstNode::integer(3),
// )
// ]);
// println!("{:?}", src);
// let mut out = String::new();
// src.emit(&mut out);
// println!("{}", out);
// test();
}
// fn test() {
// use pivot::ast::AstNode;
//
// let src = r#"
// function factorial(n) {
// var result = 1;
// while (n != 1) {
// result = result * n;
// n = n - 1;
// }
// return result;
// }
// "#;
//
// let actual_ast = pivot::parse::parse();
// let expected_ast = AstNode::function("factorial", vec!["n"],
// AstNode::block(vec![
// AstNode::variable("result", AstNode::number(1)),
// AstNode::r#while(
// AstNode::not_equal(
// AstNode::identifier("n"),
// AstNode::number(1)
// ),
// AstNode::block(vec![
// AstNode::assign("result",
// AstNode::multiply(
// AstNode::identifier("result"),
// AstNode::identifier("n")
// )
// ),
// AstNode::assign("n",
// AstNode::subtract(
// AstNode::identifier("n"),
// AstNode::number(1)
// )
// )
// ]),
// ),
// AstNode::r#return(AstNode::identifier("result"))
// ])
// );
// println!("{}", expected_ast);
// }

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use crate::ast::AstNode;
use std::ops::Range;
use regex::Regex;
pub fn parse() -> AstNode {
let src = "420";
let mut n = String::new();
println!("src: {:?}", src);
println!("n: {:?}", n);
{
let mut num = Parser::regex(r"\d+(\.\d+)?").bind(&mut n);
let mut full = num;
println!("full: {}", full);
println!("full.parse: {:?}", full.parse(src));
println!("full: {}", full);
}
println!("src: {:?}", src);
println!("n: {:?}", n);
AstNode::block(vec![])
}
#[derive(Debug)]
pub enum ParserKind<'a> {
Literal(String),
Regex(Regex),
And,
Or,
Repeat(usize),
RepeatRange(Range<usize>),
Bind(&'a mut String),
}
impl<'a> std::fmt::Display for ParserKind<'a> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
use ParserKind::*;
match self {
Literal(s) => write!(f, "Literal \"{}\"", s),
Regex(r) => write!(f, "Regex /{}/", r.as_str()),
And => write!(f, "And"),
Or => write!(f, "Or"),
Repeat(num) => write!(f, "Repeat {}", num),
RepeatRange(range) => write!(f, "RepeatRange {:?}", range),
Bind(_) => write!(f, "Bind"),
}
}
}
#[derive(Debug)]
pub struct Parser<'a> {
kind: ParserKind<'a>,
subparsers: Vec<Parser<'a>>,
// bind: Option<&'a mut String>,
}
impl<'a> std::fmt::Display for Parser<'a> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
self.pretty_print(f, 0)
}
}
impl<'a> Parser<'a> {
pub fn parse<T: Into<String>>(&mut self, src: T) -> Result<(String, String), String> {
use ParserKind::*;
let s: String = src.into();
match &mut self.kind {
Literal(literal) => {
if s.len() >= literal.len() && s[..literal.len()] == literal[..] {
Ok((s[..literal.len()].to_owned(), s[literal.len()..].to_owned()))
} else {
Err(s)
}
}
Regex(re) => {
if let Some(mat) = re.find(&s) {
if mat.start() == 0 {
Ok((s[mat.start()..mat.end()].to_owned(), s[mat.end()..].to_owned()))
} else {
Err(s)
}
} else {
Err(s)
}
}
And => {
let (lmatched, lrest) = self.subparsers[0].parse(s)?;
let (rmatched, rrest) = self.subparsers[1].parse(lrest)?;
Ok((lmatched + &rmatched, rrest))
}
Or => {
if let Ok(lresult) = self.subparsers[0].parse(s.clone()) {
Ok(lresult)
} else {
self.subparsers[1].parse(s.clone())
}
}
Repeat(num_repeats) => {
let mut matched = String::new();
let mut rest = s.clone();
for _ in 0..*num_repeats {
let (m, r) = self.subparsers[0].parse(rest)?;
matched += &m;
rest = r;
}
Ok((matched, rest))
}
RepeatRange(range) => {
let mut matched = String::new();
let mut rest = s.clone();
// Parse up to range.start
for _ in 0..range.start {
let (m, r) = self.subparsers[0].parse(rest)?;
matched += &m;
rest = r;
}
// Parse optionally up to range.end
for _ in 0..(range.end - range.start) {
let parse_result = self.subparsers[0].parse(rest);
if let Err(r) = parse_result {
rest = r;
break;
} else {
let (m, r) = parse_result.unwrap();
matched += &m;
rest = r;
}
}
Ok((matched, rest))
}
Bind(var) => {
let (matched, rest) = self.subparsers[0].parse(s)?;
**var = matched.clone();
Ok((matched, rest))
}
}
}
// Static
pub fn literal<T: Into<String>>(s: T) -> Parser<'a> {
Parser {
kind: ParserKind::Literal(s.into()),
subparsers: vec![],
// bind: None,
}
}
pub fn regex<T: Into<String>>(s: T) -> Parser<'a> {
Parser {
kind: ParserKind::Regex(Regex::new(&s.into()).expect("could not compile regex")),
subparsers: vec![],
// bind: None,
}
}
// Instance
pub fn and(self, r: Parser<'a>) -> Parser<'a> {
Parser {
kind: ParserKind::And,
subparsers: vec![self, r],
// bind: None,
}
}
pub fn or(self, r: Parser<'a>) -> Parser<'a> {
Parser {
kind: ParserKind::Or,
subparsers: vec![self, r],
// bind: None,
}
}
pub fn repeat(self, num_repeats: usize) -> Parser<'a> {
Parser {
kind: ParserKind::Repeat(num_repeats),
subparsers: vec![self],
// bind: None,
}
}
pub fn repeat_range(self, num_repeats: Range<usize>) -> Parser<'a> {
Parser {
kind: ParserKind::RepeatRange(num_repeats),
subparsers: vec![self],
// bind: None,
}
}
pub fn optional(self) -> Parser<'a> {
Parser {
kind: ParserKind::RepeatRange(0..1),
subparsers: vec![self],
// bind: None,
}
}
pub fn bind(self, s: &'a mut String) -> Parser<'a> {
Parser {
kind: ParserKind::Bind(s),
subparsers: vec![self],
}
}
// Other
pub fn pretty_print(&self, f: &mut std::fmt::Formatter<'_>, indent: usize) -> std::fmt::Result {
for _ in 0..indent {
write!(f, " ");
}
write!(f, "{}", self.kind)?;
if self.subparsers.len() > 0 {
write!(f, " [\n")?;
for subparser in &self.subparsers {
subparser.pretty_print(f, indent + 2)?;
write!(f, ",\n")?;
}
for _ in 0..indent {
write!(f, " ")?;
}
write!(f, "]")
} else {
write!(f, "")
}
}
}
// use combinators::*;
// pub mod combinators {
// pub struct Parser<'a> {
// source: &'a str,
// subparsers: Vec<Parser<'a>>,
// pub parse: Box<Fn(&'a str) -> Result<(&'a str, &'a str), &'a str>>,
// }
// impl Parser {
// // pub type S = Into<String>;
// pub fn literal<'a>(literal: &'a str) -> Parser {
// Parser {
// source: literal.into(),
// subparsers: vec![],
// parse: Box::new(|s: &'a str| -> Result<(&'a str, &'a str), &'a str> {
// if src.len() >= literal.len() {
// if src[..literal.len()] == literal[..] {
// return Ok((&src[..literal.len()], &src[literal.len()..]));
// }
// }
// Err(&src[..])
// })
// }
// }
// }
// pub fn literal<'a, T>(literal: &'a str) -> T where T: Fn(&str) -> Result<(&str, &str), &str> + 'a {
// move |src: &str| -> Result<(&str, &str), &str> {
// if src.len() >= literal.len() {
// if src[..literal.len()] == literal[..] {
// return Ok((&src[..literal.len()], &src[literal.len()..]));
// }
// }
// Err(&src[..])
// }
// }
// pub fn and<'a>(left: T, right: T) -> T where T: Fn(&str) -> Result<(&str, &str), &str> + 'a {
//
// }
// }
// // Whitespace and comments.
// let whitespace = Parser.regex(/[ \n\r\t]+/y);
// let comments = Parser.regex(/[/][/].*/y).or(
// Parser.regex(/[/][*].*[*][/]/sy)
// );
// let ignored = Parser.zeroOrMore(whitespace.or(comments));
// // Tokens
// let token = (pattern: RegExp) => Parser.regex(pattern).bind((value: any) => ignored.and(Parser.constant(value)));
// let FUNCTION = token(/function\b/y);
// let IF = token(/if\b/y);
// let ELSE = token(/else\b/y);
// let RETURN = token(/return\b/y);
// let ASSIGN = token(/=/y).map(_ => Assign);
// let VAR = token(/var\b/y);
// let WHILE = token(/while\b/y);
// let COMMA = token(/[,]/y);
// let SEMICOLON = token(/[;]/y);
// let LEFT_PAREN = token(/[(]/y);
// let RIGHT_PAREN = token(/[)]/y);
// let LEFT_BRACE = token(/[{]/y);
// let RIGHT_BRACE = token(/[}]/y);
// let NUMBER = token(/[0-9]/y).map((digits: any) => new Num(parseInt(digits)));
// let ID = token(/[a-zA-Z_][a-zA-Z0-9_]*/y).map((x: any) => new Id(x));
// let NOT = token(/!/y).map(_ => Not);
// let EQUAL = token(/==/y).map(_ => Equal);
// let NOT_EQUAL = token(/!=/y).map(_ => NotEqual);
// let PLUS = token(/[+]/y).map(_ => Add);
// let MINUS = token(/[-]/y).map(_ => Subtract);
// let STAR = token(/[*]/y).map(_ => Multiply);
// let SLASH = token(/[/]/y).map(_ => Divide);
// // Expression parser
// let expression: Parser<AST> = Parser.error('expression parser used before definition');
// // Call parser
// let args: Parser<Array<AST>> = expression.bind((arg: any) => Parser.zeroOrMore(COMMA.and(expression)).bind((args: any) => Parser.constant([arg, ...args]))).or(Parser.constant([]));
// let functionCall: Parser<AST> = ID.bind((callee: any) => LEFT_PAREN.and(args.bind((args: any) => RIGHT_PAREN.and(Parser.constant(callee.equals(new Id('assert')) ? new Assert(args[0]) : new FunctionCall(callee, args))))));
// // Atom
// let atom: Parser<AST> = functionCall.or(ID).or(NUMBER).or(LEFT_PAREN.and(expression).bind((e: any) => RIGHT_PAREN.and(Parser.constant(e))));
// // Unary operators
// let unary: Parser<AST> = Parser.optional(NOT).bind((not: any) => atom.map((operand: any) => not ? new Not(operand) : operand));
// // Infix operators
// let infix = (operatorParser: any, operandParser: any) =>
// operandParser.bind((operand: any) =>
// Parser.zeroOrMore(
// operatorParser.bind((operator: any) =>
// operandParser.bind((operand: any) =>
// Parser.constant({ operator, operand })
// )
// )
// ).map((operatorTerms: any) =>
// operatorTerms.reduce((left: any, { operator, operand }: { operator: any, operand: any }) =>
// new operator(left, operand), operand)
// )
// );
// let product = infix(STAR.or(SLASH), unary);
// let sum = infix(PLUS.or(MINUS), product);
// let comparison = infix(EQUAL.or(NOT_EQUAL), sum);
// // Associativity
// // Closing the loop: expression
// expression.parse = comparison.parse;
// // Statement
// let statement: Parser<AST> = Parser.error('statement parser used before definition');
// let returnStatement: Parser<AST> = RETURN.and(expression).bind((operand: any) => SEMICOLON.and(Parser.constant(new Return(operand))));
// let expressionStatement: Parser<AST> = expression.bind((operand: any) => SEMICOLON.and(Parser.constant(operand)));
// let ifStatement: Parser<AST> = IF.and(LEFT_PAREN).and(expression).bind((conditional: any) =>
// RIGHT_PAREN.and(statement).bind((consequence: any) =>
// ELSE.and(statement).bind((alternative: any) =>
// Parser.constant(new If(conditional, consequence, alternative))
// )
// )
// );
// let whileStatement: Parser<AST> = WHILE.and(LEFT_PAREN).and(expression).bind((conditional: any) =>
// RIGHT_PAREN.and(statement).bind((body: any) =>
// Parser.constant(new While(conditional, body))
// )
// );
// let varStatement: Parser<AST> = VAR.and(ID).bind((name: any) =>
// ASSIGN.and(expression).bind((value: any) =>
// SEMICOLON.and(Parser.constant(new Var(name, value)))
// )
// );
// let assignmentStatement: Parser<AST> = ID.bind((name: any) =>
// ASSIGN.and(expression).bind((value: any) =>
// SEMICOLON.and(Parser.constant(new Assign(name, value)))
// )
// );
// let blockStatement: Parser<AST> = LEFT_BRACE.and(Parser.zeroOrMore(statement)).bind((statements: any) =>
// RIGHT_BRACE.and(Parser.constant(new Block(statements)))
// );
// let parameters: Parser<Array<string>> = ID.bind((param: any) =>
// Parser.zeroOrMore(COMMA.and(ID)).bind((params: any) =>
// Parser.constant([param, ...params])
// )
// ).or(Parser.constant([]));
// let functionStatement: Parser<AST> = FUNCTION.and(ID).bind((name: any) =>
// LEFT_PAREN.and(parameters).bind((parameters: any) =>
// RIGHT_PAREN.and(blockStatement).bind((block: any) =>
// Parser.constant(name.equals(new Id('main')) ? new Main(block.statements) : new FunctionDefinition(name, parameters, block))
// )
// )
// );
// let statementParser: Parser<AST> =
// returnStatement
// .or(functionStatement)
// .or(ifStatement)
// .or(whileStatement)
// .or(varStatement)
// .or(assignmentStatement)
// .or(blockStatement)
// .or(expressionStatement);
// statement.parse = statementParser.parse;
// let parser: Parser<AST> = ignored.and(Parser.zeroOrMore(statement)).map((statements: any) => new Block(statements));
//
// return parser.parseStringToCompletion(source);

200
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import { AST, Num, Id, Not, Equal, NotEqual, Add, Subtract, Multiply, Divide, FunctionCall, Return, If, While, Var, Assign, Block, FunctionDefinition } from './ast.ts';
import { Main, Assert } from './codegen.ts';
export function parse(source: string): AST {
// Whitespace and comments.
let whitespace = Parser.regex(/[ \n\r\t]+/y);
let comments = Parser.regex(/[/][/].*/y).or(
Parser.regex(/[/][*].*[*][/]/sy)
);
let ignored = Parser.zeroOrMore(whitespace.or(comments));
// Tokens
let token = (pattern: RegExp) => Parser.regex(pattern).bind((value: any) => ignored.and(Parser.constant(value)));
let FUNCTION = token(/function\b/y);
let IF = token(/if\b/y);
let ELSE = token(/else\b/y);
let RETURN = token(/return\b/y);
let ASSIGN = token(/=/y).map(_ => Assign);
let VAR = token(/var\b/y);
let WHILE = token(/while\b/y);
let COMMA = token(/[,]/y);
let SEMICOLON = token(/[;]/y);
let LEFT_PAREN = token(/[(]/y);
let RIGHT_PAREN = token(/[)]/y);
let LEFT_BRACE = token(/[{]/y);
let RIGHT_BRACE = token(/[}]/y);
let NUMBER = token(/[0-9]/y).map((digits: any) => new Num(parseInt(digits)));
let ID = token(/[a-zA-Z_][a-zA-Z0-9_]*/y).map((x: any) => new Id(x));
let NOT = token(/!/y).map(_ => Not);
let EQUAL = token(/==/y).map(_ => Equal);
let NOT_EQUAL = token(/!=/y).map(_ => NotEqual);
let PLUS = token(/[+]/y).map(_ => Add);
let MINUS = token(/[-]/y).map(_ => Subtract);
let STAR = token(/[*]/y).map(_ => Multiply);
let SLASH = token(/[/]/y).map(_ => Divide);
// Expression parser
let expression: Parser<AST> = Parser.error('expression parser used before definition');
// Call parser
let args: Parser<Array<AST>> = expression.bind((arg: any) => Parser.zeroOrMore(COMMA.and(expression)).bind((args: any) => Parser.constant([arg, ...args]))).or(Parser.constant([]));
let functionCall: Parser<AST> = ID.bind((callee: any) => LEFT_PAREN.and(args.bind((args: any) => RIGHT_PAREN.and(Parser.constant(callee.equals(new Id('assert')) ? new Assert(args[0]) : new FunctionCall(callee, args))))));
// Atom
let atom: Parser<AST> = functionCall.or(ID).or(NUMBER).or(LEFT_PAREN.and(expression).bind((e: any) => RIGHT_PAREN.and(Parser.constant(e))));
// Unary operators
let unary: Parser<AST> = Parser.optional(NOT).bind((not: any) => atom.map((operand: any) => not ? new Not(operand) : operand));
// Infix operators
let infix = (operatorParser: any, operandParser: any) =>
operandParser.bind((operand: any) =>
Parser.zeroOrMore(
operatorParser.bind((operator: any) =>
operandParser.bind((operand: any) =>
Parser.constant({ operator, operand })
)
)
).map((operatorTerms: any) =>
operatorTerms.reduce((left: any, { operator, operand }: { operator: any, operand: any }) =>
new operator(left, operand), operand)
)
);
let product = infix(STAR.or(SLASH), unary);
let sum = infix(PLUS.or(MINUS), product);
let comparison = infix(EQUAL.or(NOT_EQUAL), sum);
// Associativity
// Closing the loop: expression
expression.parse = comparison.parse;
// Statement
let statement: Parser<AST> = Parser.error('statement parser used before definition');
let returnStatement: Parser<AST> = RETURN.and(expression).bind((operand: any) => SEMICOLON.and(Parser.constant(new Return(operand))));
let expressionStatement: Parser<AST> = expression.bind((operand: any) => SEMICOLON.and(Parser.constant(operand)));
let ifStatement: Parser<AST> = IF.and(LEFT_PAREN).and(expression).bind((conditional: any) =>
RIGHT_PAREN.and(statement).bind((consequence: any) =>
ELSE.and(statement).bind((alternative: any) =>
Parser.constant(new If(conditional, consequence, alternative))
)
)
);
let whileStatement: Parser<AST> = WHILE.and(LEFT_PAREN).and(expression).bind((conditional: any) =>
RIGHT_PAREN.and(statement).bind((body: any) =>
Parser.constant(new While(conditional, body))
)
);
let varStatement: Parser<AST> = VAR.and(ID).bind((name: any) =>
ASSIGN.and(expression).bind((value: any) =>
SEMICOLON.and(Parser.constant(new Var(name, value)))
)
);
let assignmentStatement: Parser<AST> = ID.bind((name: any) =>
ASSIGN.and(expression).bind((value: any) =>
SEMICOLON.and(Parser.constant(new Assign(name, value)))
)
);
let blockStatement: Parser<AST> = LEFT_BRACE.and(Parser.zeroOrMore(statement)).bind((statements: any) =>
RIGHT_BRACE.and(Parser.constant(new Block(statements)))
);
let parameters: Parser<Array<string>> = ID.bind((param: any) =>
Parser.zeroOrMore(COMMA.and(ID)).bind((params: any) =>
Parser.constant([param, ...params])
)
).or(Parser.constant([]));
let functionStatement: Parser<AST> = FUNCTION.and(ID).bind((name: any) =>
LEFT_PAREN.and(parameters).bind((parameters: any) =>
RIGHT_PAREN.and(blockStatement).bind((block: any) =>
Parser.constant(name.equals(new Id('main')) ? new Main(block.statements) : new FunctionDefinition(name, parameters, block))
)
)
);
let statementParser: Parser<AST> =
returnStatement
.or(functionStatement)
.or(ifStatement)
.or(whileStatement)
.or(varStatement)
.or(assignmentStatement)
.or(blockStatement)
.or(expressionStatement);
statement.parse = statementParser.parse;
let parser: Parser<AST> = ignored.and(Parser.zeroOrMore(statement)).map((statements: any) => new Block(statements));
return parser.parseStringToCompletion(source);
}
export class Parser<T> {
constructor(public parse: (src: Source) => (ParseResult<T> | null)) {}
parseStringToCompletion(string: string): T {
let source = new Source(string, 0);
let result = this.parse(source);
if (!result)
throw Error('Parse error at index 0');
let index = result.source.index;
if (index != result.source.string.length)
throw Error(`Parse error at index ${index}`);
return result.value;
}
static regex(regex: RegExp): Parser<string> {
return new Parser(source => source.match(regex));
}
static constant<U>(value: U): Parser<U> {
return new Parser(source => new ParseResult(value, source));
}
static error<U>(message: string): Parser<U> {
return new Parser(source => {
throw Error(message);
})
}
static zeroOrMore<U>(parser: Parser<U>): Parser<Array<U>> {
return new Parser(source => {
let results = [];
let item: any;
while (item = parser.parse(source)) {
source = item.source;
results.push(item.value);
}
return new ParseResult(results, source);
});
}
static optional<U>(parser: Parser<U>): Parser<U | null> {
return parser.or(Parser.constant(null));
}
or(parser: Parser<T>): Parser<T> {
return new Parser(source => {
let result = this.parse(source);
return result ? result : parser.parse(source);
});
}
bind<U>(callback: (value: T) => Parser<U>): Parser<U> {
return new Parser(source => {
let result = this.parse(source);
if (result) {
let value = result.value;
let source = result.source;
return callback(value).parse(source);
} else return null;
});
}
and<U>(parser: Parser<U>): Parser<U> {
return this.bind(_ => parser);
}
map<U>(callback: (t: T) => U): Parser<U> {
return this.bind(value => Parser.constant(callback(value)))
}
}
export class Source {
constructor(public string: string, public index: number) {}
match(regex: RegExp): (ParseResult<string> | null) {
regex.lastIndex = this.index;
let match = this.string.match(regex);
if (match) {
let value = match[0];
let newIndex = this.index + value.length;
let source = new Source(this.string, newIndex);
return new ParseResult(value, source);
}
return null;
}
}
export class ParseResult<T> {
constructor(public value: T, public source: Source) {}
}

7
tsconfig.json
View File

@ -1,7 +0,0 @@
{
"compilerOptions": {
"strictNullChecks": false
},
"include": ["src/**/*"],
"exclude": ["node_modules"]
}