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.gitignore vendored
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/target

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Cargo.lock generated
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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 3
[[package]]
name = "parsegranite"
version = "1.1.0-develop"

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Cargo.toml
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[package]
name = "parsegranite"
version = "1.1.0-develop"
edition = "2021"
[dependencies]

287
LICENCE
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4
README.md
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# parsegranite
`parsegranite` is the dedicated parser for the Granite toy language. It was originally a part of the Granite runtime but was split to turn into a library for use in other projects.
There is currently no stable version of `parsegranite`. It will be available once Granite v1.1.0 is released.
`parsegranite` features everything you need to easily parse a Granite program as well as provides useful tools for runtimes.
If you would like to try out `parsegranite`, use the `develop` branch!

153
src/lib.rs
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use std::collections::HashMap;
#[derive(Debug, PartialEq, Clone)]
pub enum Operator {
SetVariable,
Increment,
Decrement,
Print,
NewLabel,
UnconditionalJump,
JumpIfLessThan,
JumpIfGreaterThan,
JumpIfEqualTo,
ArithmeticAdd,
ArithmeticSubtract,
ArithmeticMultiply,
ArithmeticDivide,
TakeInput,
Comment,
StringConcatenation,
ExplicitExit,
TypeCheck,
StackPush,
Return,
VariableClone,
VariableDrop,
}
#[derive(Debug)]
pub struct Statement {
pub operator: Operator,
pub arguments: Vec<String>,
}
#[derive(Debug)]
pub struct Program {
pub statements: Vec<Statement>,
pub labels: HashMap<String, usize>,
}
pub fn parse(data: &str) -> Result<Program, String> {
let mut program_begun = false;
let mut operator: Option<Operator> = None;
let mut arguments: Vec<String> = vec![];
let mut expected_arguments: i32 = -1;
let mut argument_builder: String = "".to_string();
let mut statements: Vec<Statement> = vec![];
let mut labels: HashMap<String, usize> = HashMap::new();
let mut potential_argument_length;
let mut inside_string = false;
let mut string_escape = false;
for char in data.chars() {
if !program_begun && char == ':' {
program_begun = true;
} else if program_begun {
if operator.is_none() {
(operator, potential_argument_length) = operator_to_arglength(char.clone());
if potential_argument_length.is_none() { return Err(format!("Invalid operator {} at statement {}.", char, statements.len())); }
expected_arguments = potential_argument_length.unwrap();
} else if expected_arguments > 0 {
if inside_string {
if char == '"' && !string_escape {
inside_string = false;
} else {
if char == '\\' {
if !string_escape { string_escape = true; }
else {
argument_builder = format!("{}{}", argument_builder, char);
string_escape = false;
}
} else {
argument_builder = format!("{}{}", argument_builder, char);
string_escape = false;
}
}
} else if char == ',' {
expected_arguments = expected_arguments - 1;
arguments.push(argument_builder);
argument_builder = "".to_string();
} else if char == ':' && !inside_string {
expected_arguments = expected_arguments - 1;
arguments.push(argument_builder);
argument_builder = "".to_string();
if expected_arguments != 0 {
return Err(format!("Invalid amount of arguments for operator {:?} at {}.", operator.unwrap(), statements.len()));
}
} else if char == '"' {
if argument_builder.len() != 0 { return Err(format!("Cannot start string where argument already exists at {}.", statements.len())); }
inside_string = true;
} else if char == '\n' && !inside_string {
continue;
} else {
argument_builder = format!("{}{}", argument_builder, char);
}
}
if operator.is_some() && char == ':' && !inside_string {
let new_statement = Statement { operator: operator.clone().unwrap(), arguments: arguments.clone() };
statements.push(new_statement);
if operator.clone().unwrap() == Operator::NewLabel {
labels.insert(statements[statements.len()-1].arguments[0].clone(), statements.len()-1);
}
operator = None;
arguments = vec![];
argument_builder = "".to_string();
expected_arguments = -1;
}
}
}
if argument_builder.len() != 0 {
arguments.push(argument_builder);
expected_arguments = expected_arguments - 1;
}
if expected_arguments != 0 {
return Err(format!("Invalid amount of arguments for operator {:?} at {}.", operator.unwrap(), statements.len()));
}
let new_statement = Statement { operator: operator.unwrap().clone(), arguments: arguments.clone() };
statements.push(new_statement);
let program = Program { statements: statements, labels: labels };
Ok(program)
}
fn operator_to_arglength(operator: char) -> (Option<Operator>, Option<i32>) {
match operator {
'>' => (Some(Operator::SetVariable), Some(2)),
'?' => (Some(Operator::TakeInput), Some(1)),
'!' => (Some(Operator::Print), Some(1)),
'~' => (Some(Operator::ExplicitExit), Some(0)),
'<' => (Some(Operator::UnconditionalJump), Some(1)),
'^' => (Some(Operator::Increment), Some(1)),
'v' => (Some(Operator::Decrement), Some(1)),
'@' => (Some(Operator::NewLabel), Some(1)),
'+' => (Some(Operator::JumpIfGreaterThan), Some(3)),
'-' => (Some(Operator::JumpIfLessThan), Some(3)),
'=' => (Some(Operator::JumpIfEqualTo), Some(3)),
'*' => (Some(Operator::StringConcatenation), Some(3)),
'a' => (Some(Operator::ArithmeticAdd), Some(3)),
's' => (Some(Operator::ArithmeticSubtract), Some(3)),
'm' => (Some(Operator::ArithmeticMultiply), Some(3)),
'd' => (Some(Operator::ArithmeticDivide), Some(3)),
'0' => (Some(Operator::Comment), Some(1)),
'&' => (Some(Operator::TypeCheck), Some(2)),
'$' => (Some(Operator::VariableDrop), Some(1)),
'%' => (Some(Operator::VariableClone), Some(2)),
'#' => (Some(Operator::StackPush), Some(0)),
'|' => (Some(Operator::Return), Some(0)),
_ => (None, None),
}
}