add: integer_node_parser

src/lib.rs

@@ -1 +1,2 @@
 pub mod tokenizer;
+pub mod parser;

src/parser.rs

@@ -0,0 +1,3 @@
+mod syntax_tree;
+mod grammar_parser;
+

src/parser/grammar_parser.rs

@@ -0,0 +1,32 @@
+use crate::parser::syntax_tree::SyntaxNode;
+use crate::tokenizer::{LexicalTokenSpan, LexicalTokenType};
+use nom::bytes::complete::tag;
+use nom::combinator::map;
+use nom::{IResult};
+
+fn integer_node_parser(input: LexicalTokenSpan) -> IResult<LexicalTokenSpan, SyntaxNode> {
+    map(tag(LexicalTokenType::ConstInteger(0)),
+        |t: LexicalTokenSpan| {
+            if let LexicalTokenType::ConstInteger(number) = t.span[0].token_type {
+                SyntaxNode::const_integer(number, t)
+            } else {
+                panic!("Illegal integer constant: {}", t.as_str())
+            }
+        })(input)
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    use crate::parser::syntax_tree::SyntaxNodeType;
+    use crate::tokenizer::lexical_parser;
+
+    #[test]
+    fn number_parser_test() {
+        let (_, input) = lexical_parser("123").unwrap();
+        dbg!(&input);
+        let (_, node) = integer_node_parser((&input).into()).unwrap();
+        
+        assert_eq!(SyntaxNodeType::ConstIntegerNode(123), node.node_type);
+    }
+}

src/parser/syntax_tree.rs

@@ -0,0 +1,22 @@
+use crate::tokenizer::LexicalTokenSpan;
+
+#[derive(Debug, Copy, Clone, PartialEq)]
+pub enum SyntaxNodeType {
+    ConstIntegerNode(u32),
+    ConstFloatNode(f32),
+}
+
+#[derive(Debug, Copy, Clone, PartialEq)]
+pub struct SyntaxNode<'a> {
+    pub node_type: SyntaxNodeType,
+    pub lexical_tokens: LexicalTokenSpan<'a>
+}
+
+impl<'a> SyntaxNode<'a> {
+    pub fn const_integer(number: u32, span: LexicalTokenSpan<'a>) -> Self {
+        SyntaxNode {
+            node_type: SyntaxNodeType::ConstIntegerNode(number),
+            lexical_tokens: span
+        }
+    }
+}

src/tokenizer.rs

@@ -1,9 +1,10 @@
 use nom::IResult;
-use crate::tokenizer::parser::{combine_parser, junk_parser};
+use crate::tokenizer::lexical_parser::{combine_parser, junk_parser};
 
-mod parser;
+mod lexical_parser;
+mod lexical_token;
 
-#[derive(PartialEq, Debug, Copy, Clone)]
+#[derive(Debug, Copy, Clone)]
 pub enum LexicalTokenType {
     Identifier,
     ConstInteger(u32),
@@ -19,6 +20,11 @@ pub struct LexicalToken<'a> {
     pub literal_value: &'a str,
 }
 
+#[derive(Debug, Copy, Clone, PartialEq)]
+pub struct LexicalTokenSpan<'a> {
+    pub span: &'a [LexicalToken<'a>]
+}
+
 pub fn lexical_parser(mut input: &str) -> IResult<&str, Vec<LexicalToken>> {
     let mut array = vec![];
 

src/tokenizer/lexical_token.rs

@@ -0,0 +1,143 @@
+use crate::tokenizer::{LexicalToken, LexicalTokenSpan, LexicalTokenType};
+use nom::{Compare, CompareResult, InputLength, InputTake};
+
+impl<'a> LexicalTokenSpan<'a> {
+    pub fn new(span: &'a [LexicalToken]) -> Self {
+        Self {
+            span
+        }
+    }
+}
+
+impl<'a> From<&'a [LexicalToken<'a>]> for LexicalTokenSpan<'a> {
+    fn from(value: &'a [LexicalToken<'a>]) -> Self {
+        LexicalTokenSpan::new(value)
+    }
+}
+
+impl<'a> From<&'a Vec<LexicalToken<'a>>> for LexicalTokenSpan<'a> {
+    fn from(value: &'a Vec<LexicalToken<'a>>) -> Self {
+        LexicalTokenSpan::new(value.as_slice())
+    }
+}
+
+impl LexicalTokenSpan<'_> {
+    pub fn as_str(&self) -> &str {
+        self.span[0].literal_value
+    }
+}
+
+impl PartialEq for LexicalTokenType {
+    fn eq(&self, other: &Self) -> bool {
+        match self {
+            LexicalTokenType::ConstInteger(_) => {
+                match other {
+                    LexicalTokenType::ConstInteger(_) => true,
+                    _ => false
+                }
+            }
+            LexicalTokenType::ConstFloat(_) => {
+                match other {
+                    LexicalTokenType::ConstFloat(_) => true,
+                    _ => false
+                }
+            }
+            LexicalTokenType::Keyword => {
+                match other {
+                    LexicalTokenType::Keyword => true,
+                    _ => false
+                }
+            }
+            LexicalTokenType::Identifier => {
+                match other {
+                    LexicalTokenType::Identifier => true,
+                    _ => false
+                }
+            }
+            LexicalTokenType::Delimiter => {
+                match other {
+                    LexicalTokenType::Delimiter => true,
+                    _ => false
+                }
+            }
+            LexicalTokenType::Operator => {
+                match other {
+                    LexicalTokenType::Operator => true,
+                    _ => false
+                }
+            }
+        }
+    }
+}
+
+impl InputLength for LexicalTokenType {
+    fn input_len(&self) -> usize {
+        1
+    }
+}
+
+impl InputLength for LexicalToken<'_> {
+    fn input_len(&self) -> usize {
+        1
+    }
+}
+
+impl Compare<LexicalTokenType> for LexicalTokenSpan<'_> {
+    fn compare(&self, t: LexicalTokenType) -> CompareResult {
+        if self.span.is_empty() {
+            CompareResult::Incomplete
+        } else if self.span[0].token_type == t {
+            CompareResult::Ok
+        } else {
+            CompareResult::Error
+        }
+    }
+
+    fn compare_no_case(&self, t: LexicalTokenType) -> CompareResult {
+        self.compare(t)
+    }
+}
+
+impl<'a> Compare<LexicalToken<'a>> for LexicalTokenSpan<'a> {
+    fn compare(&self, t: LexicalToken) -> CompareResult {
+        if self.span.is_empty() {
+            CompareResult::Incomplete
+        } else if self.span[0] == t {
+            CompareResult::Ok
+        } else {
+            CompareResult::Error
+        }
+    }
+
+    fn compare_no_case(&self, t: LexicalToken) -> CompareResult {
+        self.compare(t)
+    }
+}
+
+impl InputTake for LexicalTokenSpan<'_> {
+    fn take(&self, count: usize) -> Self {
+        LexicalTokenSpan::new(&self.span[..count])
+    }
+
+    fn take_split(&self, count: usize) -> (Self, Self) {
+        let (prefix, suffix) = self.span.split_at(count);
+        // 先返回suffix，再返回prefix
+        // 这TM谁能第一次写对
+        (LexicalTokenSpan::new(suffix), LexicalTokenSpan::new(prefix))   
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn lexical_token_type_test() {
+        assert_eq!(LexicalTokenType::Identifier, LexicalTokenType::Identifier);
+        assert_eq!(LexicalTokenType::ConstInteger(1), LexicalTokenType::ConstInteger(2));
+        assert_eq!(LexicalTokenType::ConstFloat(3.0), LexicalTokenType::ConstFloat(3.0));
+
+        assert_ne!(LexicalTokenType::Identifier, LexicalTokenType::Keyword);
+        assert_ne!(LexicalTokenType::ConstInteger(1), LexicalTokenType::Operator);
+    }
+}

tests/lexical_tests.rs

@@ -14,10 +14,12 @@ fn validate_tokens(input: &'static str, tokens: Vec<LexicalTokenType>) {
 
 #[test]
 fn main_test() {
-    validate_tokens("int main { return 0; }", vec![
+    validate_tokens("int main() { return 0; }", vec![
         Keyword,
         Identifier,
         Delimiter,
+        Delimiter,
+        Delimiter,
         Keyword,
         ConstInteger(0),
         Delimiter,
@@ -25,6 +27,13 @@ fn main_test() {
     ]);
 }
 
+#[test]
+fn number_test() {
+    validate_tokens("123", vec![
+        ConstInteger(123)
+    ])
+}
+
 #[test]
 fn hexadecimal_test() {
     validate_tokens("// test hexadecimal define