add if/else, for loops, array indexing, ranges, and return to Cordial
This commit is contained in:
parent
39d2658d67
commit
8b3e780817
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@ -305,4 +305,35 @@ mod tests {
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let c = classify_line(0, "let flag: bool = 1");
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assert_eq!(c.kind, LineKind::Cordial);
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}
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#[test]
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fn if_line() {
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let c = classify_line(0, "if (x > 5) {");
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assert_eq!(c.kind, LineKind::Cordial);
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}
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#[test]
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fn else_line() {
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let c = classify_line(0, "} else {");
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assert_eq!(c.kind, LineKind::Cordial);
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}
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#[test]
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fn for_line() {
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let c = classify_line(0, "for i in arr {");
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assert_eq!(c.kind, LineKind::Cordial);
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}
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#[test]
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fn return_line() {
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let c = classify_line(0, "return x");
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assert_eq!(c.kind, LineKind::Cordial);
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}
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#[test]
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fn if_block_body_classified() {
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let doc = "if (x > 5) {\n x = 1\n} else {\n x = 0\n}";
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let lines = classify_document(doc);
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assert!(lines.iter().all(|l| l.kind == LineKind::Cordial));
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}
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}
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@ -219,4 +219,36 @@ mod tests {
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assert_eq!(result.results.len(), 1);
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assert_eq!(result.results[0].result, "0");
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}
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#[test]
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fn eval_if_else() {
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let doc = "let x = 10\nif (x > 5) {\n x = 1\n} else {\n x = 0\n}\n/= x";
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let result = evaluate_document(doc);
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assert_eq!(result.results.len(), 1);
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assert_eq!(result.results[0].result, "1");
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}
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#[test]
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fn eval_for_loop() {
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let doc = "let sum = 0\nfor i in [1, 2, 3] {\n sum = sum + i\n}\n/= sum";
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let result = evaluate_document(doc);
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assert_eq!(result.results.len(), 1);
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assert_eq!(result.results[0].result, "6");
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}
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#[test]
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fn eval_array_index() {
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let doc = "let arr = [10, 20, 30]\n/= arr[1]";
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let result = evaluate_document(doc);
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assert_eq!(result.results.len(), 1);
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assert_eq!(result.results[0].result, "20");
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}
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#[test]
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fn eval_fn_return() {
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let doc = "fn max(a, b) {\n if (a > b) {\n return a\n }\n return b\n}\n/= max(3, 7)";
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let result = evaluate_document(doc);
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assert_eq!(result.results.len(), 1);
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assert_eq!(result.results[0].result, "7");
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}
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}
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@ -89,9 +89,15 @@ enum Token {
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Or,
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Bang,
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Colon,
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DotDot,
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Let,
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While,
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Fn,
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If,
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Else,
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For,
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In,
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Return,
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Newline,
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Eof,
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}
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@ -126,7 +132,7 @@ fn tokenize(input: &str) -> Result<Vec<Token>, String> {
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if can_be_neg {
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let start = i;
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i += 1;
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while i < len && (chars[i].is_ascii_digit() || chars[i] == '.') {
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while i < len && (chars[i].is_ascii_digit() || (chars[i] == '.' && !(i + 1 < len && chars[i + 1] == '.'))) {
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i += 1;
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}
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let s: String = chars[start..i].iter().collect();
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@ -160,6 +166,9 @@ fn tokenize(input: &str) -> Result<Vec<Token>, String> {
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']' => { tokens.push(Token::RBracket); i += 1; }
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',' => { tokens.push(Token::Comma); i += 1; }
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':' => { tokens.push(Token::Colon); i += 1; }
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'.' if i + 1 < len && chars[i + 1] == '.' => {
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tokens.push(Token::DotDot); i += 2;
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}
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'!' => {
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if i + 1 < len && chars[i + 1] == '=' {
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tokens.push(Token::BangEq); i += 2;
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@ -226,9 +235,9 @@ fn tokenize(input: &str) -> Result<Vec<Token>, String> {
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i += 1; // closing quote
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tokens.push(Token::Str(s));
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}
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_ if c.is_ascii_digit() || c == '.' => {
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_ if c.is_ascii_digit() || (c == '.' && i + 1 < len && chars[i + 1].is_ascii_digit()) => {
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let start = i;
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while i < len && (chars[i].is_ascii_digit() || chars[i] == '.') {
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while i < len && (chars[i].is_ascii_digit() || (chars[i] == '.' && !(i + 1 < len && chars[i + 1] == '.'))) {
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i += 1;
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}
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let s: String = chars[start..i].iter().collect();
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@ -245,6 +254,11 @@ fn tokenize(input: &str) -> Result<Vec<Token>, String> {
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"let" => tokens.push(Token::Let),
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"while" => tokens.push(Token::While),
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"fn" => tokens.push(Token::Fn),
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"if" => tokens.push(Token::If),
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"else" => tokens.push(Token::Else),
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"for" => tokens.push(Token::For),
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"in" => tokens.push(Token::In),
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"return" => tokens.push(Token::Return),
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"true" => tokens.push(Token::Bool(true)),
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"false" => tokens.push(Token::Bool(false)),
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_ => tokens.push(Token::Ident(word)),
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@ -273,7 +287,10 @@ enum Stmt {
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Let(String, Option<String>, Expr),
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Assign(String, Expr),
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While(Expr, Vec<Stmt>),
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IfElse(Expr, Vec<Stmt>, Option<Vec<Stmt>>),
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ForLoop(String, Expr, Vec<Stmt>),
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FnDef(String, Vec<String>, Vec<Stmt>),
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Return(Expr),
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ExprStmt(Expr),
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}
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@ -287,6 +304,8 @@ enum Expr {
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UnaryOp(Op, Box<Expr>),
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Call(String, Vec<Expr>),
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Array(Vec<Expr>),
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Index(Box<Expr>, Box<Expr>),
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Range(Box<Expr>, Box<Expr>),
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}
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// --- Parser ---
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@ -353,6 +372,9 @@ impl Parser {
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match self.peek().clone() {
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Token::Let => self.parse_let(),
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Token::While => self.parse_while(),
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Token::If => self.parse_if(),
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Token::For => self.parse_for(),
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Token::Return => self.parse_return(),
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Token::Fn => self.parse_fn_def(),
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Token::Ident(_) => {
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let saved = self.pos;
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@ -450,6 +472,58 @@ impl Parser {
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Ok(Stmt::While(cond, body))
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}
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fn parse_if(&mut self) -> Result<Stmt, String> {
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self.expect(&Token::If)?;
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let has_paren = if self.peek() == &Token::LParen {
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self.advance();
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true
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} else {
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false
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};
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let cond = self.parse_expr()?;
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if has_paren {
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self.expect(&Token::RParen)?;
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}
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self.skip_newlines();
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let then_body = self.parse_block()?;
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self.skip_newlines();
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let else_body = if self.peek() == &Token::Else {
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self.advance();
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self.skip_newlines();
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if self.peek() == &Token::If {
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Some(vec![self.parse_if()?])
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} else {
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Some(self.parse_block()?)
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}
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} else {
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None
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};
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Ok(Stmt::IfElse(cond, then_body, else_body))
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}
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fn parse_for(&mut self) -> Result<Stmt, String> {
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self.expect(&Token::For)?;
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let var = match self.advance() {
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Token::Ident(n) => n,
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t => return Err(format!("expected loop variable, got {:?}", t)),
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};
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self.expect(&Token::In)?;
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let iter = self.parse_expr()?;
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self.skip_newlines();
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let body = self.parse_block()?;
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Ok(Stmt::ForLoop(var, iter, body))
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}
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fn parse_return(&mut self) -> Result<Stmt, String> {
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self.expect(&Token::Return)?;
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if matches!(self.peek(), Token::Newline | Token::Eof | Token::RBrace) {
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return Ok(Stmt::Return(Expr::Bool(false)));
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}
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let expr = self.parse_expr()?;
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self.skip_newlines();
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Ok(Stmt::Return(expr))
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}
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fn parse_fn_def(&mut self) -> Result<Stmt, String> {
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self.expect(&Token::Fn)?;
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let name = match self.advance() {
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@ -477,9 +551,14 @@ impl Parser {
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Ok(Stmt::FnDef(name, params, body))
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}
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// Expression precedence: or < and < comparison < add/sub < mul/div/mod < pow < unary < call/atom
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fn parse_expr(&mut self) -> Result<Expr, String> {
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self.parse_or()
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let left = self.parse_or()?;
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if self.peek() == &Token::DotDot {
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self.advance();
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let right = self.parse_or()?;
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return Ok(Expr::Range(Box::new(left), Box::new(right)));
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}
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Ok(left)
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}
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fn parse_or(&mut self) -> Result<Expr, String> {
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@ -581,7 +660,7 @@ impl Parser {
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}
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fn parse_call(&mut self) -> Result<Expr, String> {
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let expr = self.parse_atom()?;
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let mut expr = self.parse_atom()?;
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if let Expr::Ident(ref name) = expr {
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if self.peek() == &Token::LParen {
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self.advance();
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@ -594,9 +673,15 @@ impl Parser {
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}
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}
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self.expect(&Token::RParen)?;
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return Ok(Expr::Call(name.clone(), args));
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expr = Expr::Call(name.clone(), args);
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}
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}
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while self.peek() == &Token::LBracket {
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self.advance();
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let index = self.parse_expr()?;
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self.expect(&Token::RBracket)?;
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expr = Expr::Index(Box::new(expr), Box::new(index));
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}
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Ok(expr)
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}
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@ -713,6 +798,37 @@ impl Interpreter {
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}
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Ok(Value::Void)
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}
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Stmt::IfElse(cond, then_body, else_body) => {
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let cv = self.eval_expr(cond, depth)?;
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let body = if cv.truthy() { then_body } else {
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match else_body { Some(b) => b, None => return Ok(Value::Void) }
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};
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let mut last = Value::Void;
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for s in body {
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last = self.exec_stmt(s, depth)?;
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}
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Ok(last)
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}
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Stmt::ForLoop(var, iter_expr, body) => {
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let iterable = self.eval_expr(iter_expr, depth)?;
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let items = match iterable {
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Value::Array(a) => a,
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_ => return Err("for loop requires an array or range".into()),
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};
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let mut iterations = 0;
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let mut last = Value::Void;
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for item in &items {
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iterations += 1;
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if iterations > MAX_ITERATIONS {
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return Err(format!("loop exceeded {} iterations", MAX_ITERATIONS));
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}
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self.vars.insert(var.clone(), item.clone());
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for s in body {
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last = self.exec_stmt(s, depth)?;
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}
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}
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Ok(last)
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}
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Stmt::FnDef(name, params, body) => {
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self.fns.insert(name.clone(), FnDef {
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params: params.clone(),
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@ -720,6 +836,10 @@ impl Interpreter {
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});
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Ok(Value::Void)
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}
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Stmt::Return(expr) => {
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let val = self.eval_expr(expr, depth)?;
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Err(format!("\x00return:{}", encode_return(&val)))
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}
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Stmt::ExprStmt(expr) => {
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self.eval_expr(expr, depth)
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}
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@ -756,6 +876,41 @@ impl Interpreter {
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Expr::UnaryOp(op, _) => Err(format!("invalid unary op: {:?}", op)),
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Expr::BinOp(op, lhs, rhs) => self.eval_binop(op, lhs, rhs, depth),
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Expr::Call(name, args) => self.eval_call(name, args, depth),
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Expr::Index(target, index) => {
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let target_val = self.eval_expr(target, depth)?;
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let index_val = self.eval_expr(index, depth)?;
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match (&target_val, &index_val) {
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(Value::Array(arr), Value::Number(n)) => {
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let i = *n as i64;
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let idx = if i < 0 { (arr.len() as i64 + i) as usize } else { i as usize };
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arr.get(idx).cloned().ok_or_else(|| format!("index {} out of bounds (len {})", i, arr.len()))
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}
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(Value::Str(s), Value::Number(n)) => {
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let i = *n as i64;
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let chars: Vec<char> = s.chars().collect();
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let idx = if i < 0 { (chars.len() as i64 + i) as usize } else { i as usize };
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chars.get(idx).map(|c| Value::Str(c.to_string()))
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.ok_or_else(|| format!("index {} out of bounds (len {})", i, chars.len()))
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}
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_ => Err(format!("cannot index {} with {}", type_name(&target_val), type_name(&index_val))),
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}
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}
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Expr::Range(start, end) => {
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let sv = self.eval_expr(start, depth)?;
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let ev = self.eval_expr(end, depth)?;
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match (&sv, &ev) {
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(Value::Number(a), Value::Number(b)) => {
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let a = *a as i64;
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let b = *b as i64;
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let items: Vec<Value> = (a..b).map(|n| Value::Number(n as f64)).collect();
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if items.len() > MAX_ITERATIONS {
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return Err(format!("range too large ({} elements)", items.len()));
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}
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Ok(Value::Array(items))
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}
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_ => Err("range requires two numbers".into()),
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}
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}
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}
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}
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@ -861,6 +1016,35 @@ impl Interpreter {
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_ => Err("len() expects a string or array".into()),
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};
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}
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"range" => {
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if args.len() != 2 {
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return Err("range() expects 2 arguments".into());
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}
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let start = match self.eval_expr(&args[0], depth)? {
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Value::Number(n) => n as i64,
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_ => return Err("range() expects numbers".into()),
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};
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let end = match self.eval_expr(&args[1], depth)? {
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Value::Number(n) => n as i64,
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_ => return Err("range() expects numbers".into()),
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};
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let items: Vec<Value> = (start..end).map(|n| Value::Number(n as f64)).collect();
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if items.len() > MAX_ITERATIONS {
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return Err(format!("range too large ({} elements)", items.len()));
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}
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return Ok(Value::Array(items));
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}
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"push" => {
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if args.len() != 2 {
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return Err("push() expects 2 arguments (array, value)".into());
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}
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let arr = self.eval_expr(&args[0], depth)?;
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let val = self.eval_expr(&args[1], depth)?;
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return match arr {
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Value::Array(mut a) => { a.push(val); Ok(Value::Array(a)) }
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_ => Err("push() expects an array as first argument".into()),
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};
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}
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_ => {}
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}
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@ -884,7 +1068,17 @@ impl Interpreter {
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let mut result = Value::Void;
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for stmt in &fdef.body {
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result = self.exec_stmt(stmt, depth + 1)?;
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match self.exec_stmt(stmt, depth + 1) {
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Ok(v) => result = v,
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Err(e) if e.starts_with('\x00') => {
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self.vars = saved_vars;
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return Ok(decode_return(&e));
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}
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Err(e) => {
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self.vars = saved_vars;
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return Err(e);
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}
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}
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}
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self.vars = saved_vars;
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@ -892,6 +1086,31 @@ impl Interpreter {
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}
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}
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const RETURN_PREFIX: &str = "\x00return:";
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fn encode_return(val: &Value) -> String {
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match val {
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Value::Number(n) => format!("n:{}", n),
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Value::Bool(b) => format!("b:{}", b),
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Value::Str(s) => format!("s:{}", s),
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Value::Void => "v:".into(),
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_ => format!("s:{}", val.display()),
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}
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}
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fn decode_return(encoded: &str) -> Value {
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let payload = &encoded[RETURN_PREFIX.len()..];
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if let Some(rest) = payload.strip_prefix("n:") {
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rest.parse::<f64>().map(Value::Number).unwrap_or(Value::Void)
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} else if let Some(rest) = payload.strip_prefix("b:") {
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Value::Bool(rest == "true")
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} else if let Some(rest) = payload.strip_prefix("s:") {
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Value::Str(rest.to_string())
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} else {
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Value::Void
|
||||
}
|
||||
}
|
||||
|
||||
fn type_name(v: &Value) -> &'static str {
|
||||
match v {
|
||||
Value::Number(_) => "number",
|
||||
|
|
@ -1268,4 +1487,131 @@ fn fib(n) {
|
|||
/= fib(10)";
|
||||
assert_eq!(eval(input), "55");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn if_true() {
|
||||
let input = "let x = 10\nif (x > 5) {\n x = 100\n}\n/= x";
|
||||
assert_eq!(eval(input), "100");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn if_false() {
|
||||
let input = "let x = 3\nif (x > 5) {\n x = 100\n}\n/= x";
|
||||
assert_eq!(eval(input), "3");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn if_else() {
|
||||
let input = "let x = 3\nif (x > 5) {\n x = 100\n} else {\n x = 0\n}\n/= x";
|
||||
assert_eq!(eval(input), "0");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn if_else_chain() {
|
||||
let input = "\
|
||||
let x = 5
|
||||
let r = 0
|
||||
if (x > 10) {
|
||||
r = 3
|
||||
} else if (x > 3) {
|
||||
r = 2
|
||||
} else {
|
||||
r = 1
|
||||
}
|
||||
/= r";
|
||||
assert_eq!(eval(input), "2");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn if_without_parens() {
|
||||
let input = "let x = 10\nif x > 5 {\n x = 100\n}\n/= x";
|
||||
assert_eq!(eval(input), "100");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn for_loop_array() {
|
||||
let input = "let sum = 0\nfor x in [1, 2, 3, 4, 5] {\n sum = sum + x\n}\n/= sum";
|
||||
assert_eq!(eval(input), "15");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn for_loop_range() {
|
||||
let input = "let sum = 0\nfor i in 0..5 {\n sum = sum + i\n}\n/= sum";
|
||||
assert_eq!(eval(input), "10");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn for_loop_range_fn() {
|
||||
let input = "let sum = 0\nfor i in range(1, 6) {\n sum = sum + i\n}\n/= sum";
|
||||
assert_eq!(eval(input), "15");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn array_index() {
|
||||
assert_eq!(eval_one("[10, 20, 30][1]"), "20");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn array_index_variable() {
|
||||
let input = "let arr = [10, 20, 30]\n/= arr[2]";
|
||||
assert_eq!(eval(input), "30");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn array_negative_index() {
|
||||
assert_eq!(eval_one("[10, 20, 30][-1]"), "30");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn string_index() {
|
||||
assert_eq!(eval_one("\"hello\"[0]"), "h");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn array_index_out_of_bounds() {
|
||||
let result = eval_one("[1, 2][5]");
|
||||
assert!(result.contains("error"), "should error: {}", result);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn return_from_function() {
|
||||
let input = "\
|
||||
fn first_positive(a, b) {
|
||||
if (a > 0) {
|
||||
return a
|
||||
}
|
||||
if (b > 0) {
|
||||
return b
|
||||
}
|
||||
return 0
|
||||
}
|
||||
/= first_positive(-1, 5)";
|
||||
assert_eq!(eval(input), "5");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn return_early_from_loop() {
|
||||
let input = "\
|
||||
fn find(arr, target) {
|
||||
for x in arr {
|
||||
if (x == target) {
|
||||
return x
|
||||
}
|
||||
}
|
||||
return -1
|
||||
}
|
||||
/= find([1, 2, 3, 4], 3)";
|
||||
assert_eq!(eval(input), "3");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn push_builtin() {
|
||||
let input = "let arr = [1, 2]\nlet arr = push(arr, 3)\n/= arr";
|
||||
assert_eq!(eval(input), "[1, 2, 3]");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn range_expression() {
|
||||
assert_eq!(eval_one("0..5"), "[0, 1, 2, 3, 4]");
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue