osaxma/danalysis

danalysis

nothing fancy here -- just a repo to explore dart analysis (aka danalysis for the lack of creativity).

My main goal of this repo is to keep track of any code I write related to dart analysis because I usually forget how I did it.

---

Print AST

Check examples/print_ast.dart to print an AST in a tree structure:

• sample code:

  void main() {
      print('starting the program');
      // explicit type 
      final int a = 10;
      // implicit type
      final b = 20;
      
      final c = a * b * d;
  
      print('c = $c');
  }

• dart run examples/print_ast.dart output:

  Compilation Unit
      └╌Function Declaration
          ╎╌Named Type
          └╌Function Expression
              ╎╌Formal Parameter List
              └╌Block Function Body
                      └╌Block
                          ╎╌Expression Statement
                          ┊     └╌Method Invocation
                          ┊          ╎╌Simple Identifier
                          ┊          └╌Argument List
                          ┊               └╌Simple String Literal
                          ╎╌Variable Declaration Statement
                          ┊     └╌Variable Declaration List
                          ┊          ╎╌Named Type
                          ┊          └╌Variable Declaration
                          ┊               └╌Integer Literal
                          ╎╌Variable Declaration Statement
                          ┊     └╌Variable Declaration List
                          ┊          └╌Variable Declaration
                          ┊               └╌Integer Literal
                          ╎╌Variable Declaration Statement
                          ┊     └╌Variable Declaration List
                          ┊          └╌Variable Declaration
                          ┊               └╌Binary Expression
                          ┊                    ╎╌Binary Expression
                          ┊                    ┊     ╎╌Simple Identifier
                          ┊                    ┊     └╌Simple Identifier
                          ┊                    └╌Simple Identifier
                          └╌Expression Statement
                              └╌Method Invocation
                                  ╎╌Simple Identifier
                                  └╌Argument List
                                          └╌String Interpolation
                                              ╎╌Interpolation String
                                              ╎╌Interpolation Expression
                                              ┊     └╌Simple Identifier
                                              └╌Interpolation String
  

Print Tokens

For the same sample code given in Print AST above:

• dart run examples/print_tokens.dart will print:

  token type                      | token                 
  ========================================================
  VOID                            | void                  
  IDENTIFIER                      | main                  
  OPEN_PAREN                      | (                     
  CLOSE_PAREN                     | )                     
  OPEN_CURLY_BRACKET              | {                     
  IDENTIFIER                      | print                 
  OPEN_PAREN                      | (                     
  STRING                          | 'starting the program'
  CLOSE_PAREN                     | )                     
  SEMICOLON                       | ;                     
  FINAL                           | final                 
  IDENTIFIER                      | int                   
  IDENTIFIER                      | a                     
  EQ                              | =                     
  INT                             | 10                    
  SEMICOLON                       | ;                     
  FINAL                           | final                 
  IDENTIFIER                      | b                     
  EQ                              | =                     
  INT                             | 20                    
  SEMICOLON                       | ;                     
  FINAL                           | final                 
  IDENTIFIER                      | c                     
  EQ                              | =                     
  IDENTIFIER                      | a                     
  STAR                            | *                     
  IDENTIFIER                      | b                     
  STAR                            | *                     
  IDENTIFIER                      | d                     
  SEMICOLON                       | ;                     
  IDENTIFIER                      | print                 
  OPEN_PAREN                      | (                     
  STRING                          | 'c =                  
  STRING_INTERPOLATION_IDENTIFIER | $                     
  IDENTIFIER                      | c                     
  STRING                          | '                     
  CLOSE_PAREN                     | )                     
  SEMICOLON                       | ;                     
  CLOSE_CURLY_BRACKET             | }