hatter/grassmudhorse.rs
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Hatter Jiang
2020-05-05 11:32:54 +08:00
parent 128e77c9df
commit f62f966eaf
4 changed files with 245 additions and 3 deletions
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3
.gitignore vendored
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@@ -3,9 +3,6 @@
# will have compiled files and executables
/target/
# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
Cargo.lock
# These are backup files generated by rustfmt
**/*.rs.bk

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Cargo.lock generated Normal file
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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
[[package]]
name = "err-derive"
version = "0.2.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
"proc-macro-error",
"proc-macro2",
"quote",
"rustversion",
"syn",
"synstructure",
]
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]
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10
Cargo.toml Normal file
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@@ -0,0 +1,10 @@
[package]
name = "grassmudhorse"
version = "0.1.0"
authors = ["Hatter Jiang <jht5945@gmail.com>"]
edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
err-derive = "0.2.2"

112
src/main.rs Normal file
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use err_derive::Error;
#[derive(Debug, Error)]
pub enum ParseError {
#[error(display = "error syntax: {:?}", _0)]
ErrorSyntax(String),
}
#[derive(Debug)]
enum Instruction {
Push,
Dup,
CopyN,
Swap,
Pop,
PopN,
Add,
Sub,
Mul,
Div,
Mod,
Store,
Retrieve,
DefineLabel,
CallAtLabel,
GotoLabel,
GotoLabelE0,
GotoLabelL0,
ReturnCallAt,
End,
StdOutChar,
StdOutNum,
StdInChar,
StdInNum,
}
struct ParseChars {
index: usize,
chars: Vec<char>,
}
impl ParseChars {
fn next(&mut self) -> Option<char> {
let c = self.try_next();
if c.is_some() { self.index += 1; }
c
}
fn try_next(&self) -> Option<char> {
self.try_next_n(0_usize)
}
fn try_next_n(&self, nn: usize) -> Option<char> {
let i = self.index + nn;
if i >= self.chars.len() {
None
} else {
let c = self.chars[i];
Some(c)
}
}
}
const VALID_INSTRUCTION_CHARS: &str = "草泥马河蟹";
fn main() {
let input = "草草草泥马 马草草草泥草草草草泥泥马 草马草 泥马草泥 草草草泥草泥草马 泥马草草 草草草泥马 泥草草草 草马草 草草草泥草泥泥马 泥草草泥 马泥草草泥草草草泥草泥马 马草马草泥草草草草泥泥马 马草草草泥草草草泥草泥马 草马马 马马马";
println!("{:?}", parse_lang(input));
}
fn parse_lang(lang: &str) -> Result<Vec<Instruction>, ParseError> {
let mut r = vec![];
let mut cs = ParseChars{ index: 0_usize, chars: lang.chars().filter(|c| {
VALID_INSTRUCTION_CHARS.chars().any(|vic| vic == *c)
}).collect(), };
while let Some(c) = cs.next() {
let nc = match cs.try_next() {
Some(nc) => nc, None => {
return Err(ParseError::ErrorSyntax(
format!("Syntax error: after {} has no valid char", c)
));
},
};
if c == '草' && nc == '草' { // Push
cs.next();
// todo parse
continue;
}
let nnc = match cs.try_next_n(1) {
Some(nc) => nc, None => {
return Err(ParseError::ErrorSyntax(
format!("Syntax error: after {}{} has no valid char", c, nc)
));
},
};
if c == '草' && nc == '马' || nnc == '草' { // Dup
}
let nnnc = match cs.try_next_n(2) {
Some(nc) => nc, None => {
return Err(ParseError::ErrorSyntax(
format!("Syntax error: after {}{}{} has no valid char", c, nc, nnc)
));
},
};
}
Ok(r)
}