parser/cgen: default struct field values

vlib/strconv/atof.v

@@ -23,7 +23,7 @@ module strconv
 union Float64u {
 mut:
 	f f64
-	u u64 = u64(0)
+	u u64
 }
 
 /**********************************************************************
@@ -165,9 +165,9 @@ fn is_exp(x byte) bool {
 // The structure is filled by parser, then given to converter.
 pub struct PrepNumber {
 pub mut:
-	negative bool=false // 0 if positive number, 1 if negative
-	exponent int=0 // power of 10 exponent
-	mantissa u64=u64(0) // integer mantissa
+	negative bool // 0 if positive number, 1 if negative
+	exponent int // power of 10 exponent
+	mantissa u64 // integer mantissa
 }
 /**********************************************************************
 *

vlib/strconv/ftoa/f32_str.v

@@ -22,14 +22,14 @@ module ftoa
 // dec32 is a floating decimal type representing m * 10^e.
 struct Dec32 {
 mut:
-	m u32 = u32(0)
+	m u32 = 0
 	e int = 0
 }
 
 // support union for convert f32 to u32
 union Uf32 {
 mut:
-	f f32 = f32(0)
+	f f32 = 0
 	u u32
 }
 

vlib/strconv/ftoa/f64_str.v

@@ -28,14 +28,14 @@ mut:
 // dec64 is a floating decimal type representing m * 10^e.
 struct Dec64 {
 mut:
-	m u64 = u64(0)
+	m u64 = 0
 	e int = 0
 }
 
 // support union for convert f64 to u64
 union Uf64 {
 mut:
-	f f64 = f64(0)
+	f f64 = 0
 	u u64
 }
 

vlib/strings/builder_c.v

@@ -8,7 +8,7 @@ mut:
 	buf          []byte
 pub mut:
 	len          int
-	initial_size int=1
+	initial_size int = 1
 }
 
 pub fn new_builder(initial_size int) Builder {

vlib/v/ast/ast.v

@@ -107,7 +107,7 @@ pub:
 	name string
 	pos token.Position
 	comment Comment
-	default_expr Expr
+	default_expr string // token literal //Expr
 mut:
 	typ table.Type
 }

vlib/v/gen/cgen.v

@@ -1900,7 +1900,7 @@ fn (g mut Gen) struct_init(it ast.StructInit) {
 				continue
 			}
 			field_name := c_name(field.name)
-			zero := g.type_default(field.typ)
+			zero := if field.default_val != '' { field.default_val } else { g.type_default(field.typ) }
 			g.writeln('\t.$field_name = $zero,')			// zer0')
 		}
 	}

vlib/v/parser/parser.v

@@ -1540,11 +1540,13 @@ fn (p mut Parser) struct_decl() ast.StructDecl {
 			println('XXXX' + s.str())
 		}
 		*/
-		mut default_expr := ast.Expr{}
+		mut default_expr := '' // ast.Expr{}
 		if p.tok.kind == .assign {
 			// Default value
 			p.next()
-			default_expr = p.expr(0)
+			default_expr = p.tok.lit
+			p.expr(0)
+			//default_expr = p.expr(0)
 		}
 		if p.tok.kind == .comment {
 			comment = p.comment()
@@ -1554,10 +1556,12 @@ fn (p mut Parser) struct_decl() ast.StructDecl {
 			pos: field_pos
 			typ: typ
 			comment: comment
+			default_expr: default_expr
 		}
 		fields << table.Field{
 			name: field_name
 			typ: typ
+			default_val: default_expr
 		}
 		// println('struct field $ti.name $field_name')
 	}

vlib/v/table/atypes.v

@@ -557,6 +557,7 @@ pub:
 	name string
 mut:
 	typ  Type
+	default_val string
 }
 
 pub struct Array {