added if and while to parser
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f165dad8f5
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@ -12,7 +12,9 @@ r"
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pi = 3.1415926
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main() {
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if 4 > 2 {
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val = 9 / 5
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}
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}
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";
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@ -240,6 +240,7 @@ fn parse_term<'a>(term: &mut VecDeque<Token<'a>>, scope: &mut Scope) {
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}
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Token::Number(_) => output.push_back(token),
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Token::Assign(_) => op_stack.push(token),
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Token::Keyword(_) => op_stack.push(token),
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Token::Delemiter(char) => {
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match char {
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@ -1,4 +1,4 @@
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use std::collections::{VecDeque};
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use std::{collections::{VecDeque}};
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#[derive(Debug, Hash, PartialEq, Eq)]
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pub enum Operator {
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@ -81,6 +81,22 @@ impl Operator {
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}
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}
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#[derive(Debug, Clone, Copy, Hash, PartialEq, Eq)]
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pub enum Keyword {
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If,
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While
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}
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impl Keyword {
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pub fn parse<'a>(text: &'a str) -> Keyword {
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return match text {
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"if" => Keyword::If,
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"while" => Keyword::While,
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_ => panic!("Text not a known keyword {text}")
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}
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}
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}
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#[derive(Debug, Hash, PartialEq, Eq)]
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/// A token represents a basic building block for source code.
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/// They give a meaning to patterns of chars allowing to interpret them.
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@ -96,9 +112,10 @@ pub enum Token<'a> {
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Arg(&'a str),
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Assign(&'a str),
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Bool(bool),
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Keyword(Keyword)
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}
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const TOKEN_REGEX_SRC: &'static str = r"(#.*)|(true|false|yes|no|maybe)|([A-Za-z_]+)\s*=|([A-Za-z_]+)|(\d*\.?\d+)|(!=|==|<=|<=|[&|+\-*/<>])|([(){}])|(\n)";
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const TOKEN_REGEX_SRC: &'static str = r"(#.*)|(if|while)|(true|false|yes|no|maybe)|([A-Za-z_]+)\s*=|([A-Za-z_]+)|(\d*\.?\d+)|(!=|==|<=|<=|[&|+\-*/<>])|([(){}])|(\n)";
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lazy_static::lazy_static! {
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static ref TOKEN_REGEX: regex::Regex = regex::Regex::new(TOKEN_REGEX_SRC).unwrap();
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@ -120,13 +137,14 @@ pub fn tokenize<'a>(source: &'a str) -> VecDeque<Token<'a>> {
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// if we have a match, save it as token
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if let Some(mat) = group {
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tokens.push_back(match i {
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2 => Token::Bool(parse_bool(mat.as_str())),
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3 => Token::Assign(mat.as_str()),
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4 => Token::Word(mat.as_str()),
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5 => Token::Number(mat.as_str()),
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6 => Token::Operator(Operator::parse(mat.as_str())),
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7 => Token::Delemiter(mat.as_str().chars().nth(0).unwrap()),
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8 => Token::LineBreak,
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2 => Token::Keyword(Keyword::parse(mat.as_str())),
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3 => Token::Bool(parse_bool(mat.as_str())),
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4 => Token::Assign(mat.as_str()),
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5 => Token::Word(mat.as_str()),
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6 => Token::Number(mat.as_str()),
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7 => Token::Operator(Operator::parse(mat.as_str())),
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8 => Token::Delemiter(mat.as_str().chars().nth(0).unwrap()),
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9 => Token::LineBreak,
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_ => panic!("Unknown match to tokenize: {}", mat.as_str())
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});
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