RubyVM::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): >

 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);
}
 

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): >

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

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): >

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