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Module: RubyVM::AbstractSyntaxTree

Relationships & Source Files
Namespace Children
Classes:
Node
Defined in: ast.c

Overview

AbstractSyntaxTree provides methods to parse Ruby code into abstract syntax trees. The nodes in the tree are instances of Node.

Class Method Summary

Class Method Details

.of(proc) ⇒ AbstractSyntaxTree .of(method) ⇒ AbstractSyntaxTree

Returns AST nodes of the given proc or method.

RubyVM::AbstractSyntaxTree.of(proc {1 + 2})
# => #<RubyVM::AbstractSyntaxTree::Node(NODE_SCOPE(0) 1:35, 1:42): >

def hello
  puts "hello, world"
end

RubyVM::AbstractSyntaxTree.of(method(:hello))
# => #<RubyVM::AbstractSyntaxTree::Node(NODE_SCOPE(0) 1:0, 3:3): >
[ GitHub ] 

  


# File 'ast.c', line 220



static VALUE
rb_ast_s_of(VALUE module, VALUE body)
{
    VALUE path, node, lines;
    int node_id;
    const rb_iseq_t *iseq = NULL;

    if (rb_obj_is_proc(body)) {
        iseq = vm_proc_iseq(body);

        if (!rb_obj_is_iseq((VALUE)iseq)) {
            iseq = NULL;
        }
    }
    else {
        iseq = rb_method_iseq(body);
    }

    if (!iseq) return Qnil;

    path = rb_iseq_path(iseq);
    node_id = iseq->body->location.node_id;
    if (!NIL_P(lines = script_lines(path))) {
        node = rb_ast_parse_array(lines);
    }
    else if (RSTRING_LEN(path) == 2 && memcmp(RSTRING_PTR(path), "-e", 2) == 0) {
        node = rb_ast_parse_str(rb_e_script);
    }
    else {
        node = rb_ast_parse_file(path);
    }

    return node_find(node, node_id);
}


  








  

    .parse(string)  ⇒ AbstractSyntaxTree   



  

    

Parses the given string into an abstract syntax tree, returning the root node of that tree.



::SyntaxError is raised if the given string is invalid syntax.



RubyVM::AbstractSyntaxTree.parse("x = 1 + 2")
# => #<RubyVM::AbstractSyntaxTree::Node(NODE_SCOPE(0) 1:0, 1:9): >


  



  [ GitHub ]


  

  


# File 'ast.c', line 88



static VALUE
rb_ast_s_parse(VALUE module, VALUE str)
{
    return rb_ast_parse_str(str);
}


  








  

    .parse_file(pathname)  ⇒ AbstractSyntaxTree   



  

    

Reads the file from pathname, then parses it like .parse, returning the root node of the abstract syntax tree.



::SyntaxError is raised if pathname‘s contents are not valid Ruby syntax.



RubyVM::AbstractSyntaxTree.parse_file("my-app/app.rb")
# => #<RubyVM::AbstractSyntaxTree::Node(NODE_SCOPE(0) 1:0, 31:3): >


  



  [ GitHub ]


  

  


# File 'ast.c', line 117



static VALUE
rb_ast_s_parse_file(VALUE module, VALUE path)
{
    return rb_ast_parse_file(path);
}