Method parse_const_decl

package_text.go:486–535

ConstDecl = "const" ExportedName [ Type ] "=" Literal . Literal = bool_lit | int_lit | float_lit | complex_lit | string_lit . bool_lit = "true" | "false" . complex_lit = "(" float_lit "+" float_lit ")" . rune_lit = "(" int_lit "+" int_lit ")" . string_lit = `"` { unicode_char } `"` .

()

// rune_lit    = "(" int_lit "+" int_lit ")" .
// string_lit  = `"` { unicode_char } `"` .
func (p *gc_parser) parse_const_decl() (string, *ast.GenDecl) {
	// TODO: do we really need actual const value? gocode doesn't use this
	p.expect_keyword("const")
	name := p.parse_exported_name()

	var typ ast.Expr
	if p.tok != '=' {
		typ = p.parse_type()
	}

	p.expect('=')

	// skip the value
	switch p.tok {
	case scanner.Ident:
		// must be bool, true or false
		p.next()
	case '-', '+', scanner.Int:
		// number
		p.parse_number()
	case '(':
		// complex_lit or rune_lit
		p.next() // skip '('
		if p.tok == scanner.Char {
			p.next()
		} else {
			p.parse_number()
		}
		p.expect('+')
		p.parse_number()
		p.expect(')')
	case scanner.Char:
		p.next()
	case scanner.String:
		p.next()
	default:
		p.error("expected literal")
	}

	return name.X.(*ast.Ident).Name, &ast.GenDecl{
		Tok: token.CONST,
		Specs: []ast.Spec{
			&ast.ValueSpec{
				Names:  []*ast.Ident{name.Sel},
				Type:   typ,
				Values: []ast.Expr{&ast.BasicLit{Kind: token.INT, Value: "0"}},
			},
		},
	}
}

// TypeDecl = "type" ExportedName Type .
func (p *gc_parser) parse_type_decl() (string, *ast.GenDecl) {