From 5d976d841b49a3bee018649b295b44e574b69b3c Mon Sep 17 00:00:00 2001
From: Alexander Medvednikov <alexander@medvednikov.com>
Date: Tue, 24 Mar 2020 17:07:27 +0100
Subject: [PATCH] v2: raw strings

---
 vlib/builtin/array_test.v |  1 -
 vlib/v/ast/ast.v          |  4 +++-
 vlib/v/checker/checker.v  |  2 +-
 vlib/v/parser/parser.v    | 12 ++++++++++++
 4 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/vlib/builtin/array_test.v b/vlib/builtin/array_test.v
index 685cfddd1d..58fbf65a56 100644
--- a/vlib/builtin/array_test.v
+++ b/vlib/builtin/array_test.v
@@ -267,7 +267,6 @@ fn test_reverse() {
 	for i, _ in d {
 		assert d[i] == b[b.len - i - 1]
 	}
-
 	e := []int
 	f := e.reverse()
 	assert f.len == 0
diff --git a/vlib/v/ast/ast.v b/vlib/v/ast/ast.v
index 0d78a94270..63f68fd709 100644
--- a/vlib/v/ast/ast.v
+++ b/vlib/v/ast/ast.v
@@ -56,7 +56,9 @@ pub:
 
 pub struct StringLiteral {
 pub:
-	val string
+	val    string
+	is_raw bool
+	is_c   bool
 }
 
 // 'name: $name'
diff --git a/vlib/v/checker/checker.v b/vlib/v/checker/checker.v
index 2618a80818..08133d32c3 100644
--- a/vlib/v/checker/checker.v
+++ b/vlib/v/checker/checker.v
@@ -602,7 +602,7 @@ fn (c mut Checker) stmt(node ast.Stmt) {
 				value_type := c.table.value_type(typ)
 				if value_type == table.void_type {
 					typ_sym := c.table.get_type_symbol(typ)
-					c.error('for in: cannot index $typ_sym.name', it.pos)
+					c.error('for in: cannot index `$typ_sym.name`', it.pos)
 				}
 				it.cond_type = typ
 				it.kind = sym.kind
diff --git a/vlib/v/parser/parser.v b/vlib/v/parser/parser.v
index c84990cfd7..c4e33901cf 100644
--- a/vlib/v/parser/parser.v
+++ b/vlib/v/parser/parser.v
@@ -594,6 +594,11 @@ pub fn (p mut Parser) name_expr() ast.Expr {
 			typ: map_type
 		}
 	}
+	// Raw string (`s := r'hello \n ')
+	if p.tok.lit == 'r' && p.peek_tok.kind == .string {
+		// && p.prev_tok.kind != .str_dollar {
+		return p.string_expr()
+	}
 	known_var := p.scope.known_var(p.tok.lit)
 	if p.peek_tok.kind == .dot && !known_var && (is_c || p.known_import(p.tok.lit) || p.mod.all_after('.') == p.tok.lit) {
 		if is_c {
@@ -1248,10 +1253,17 @@ fn (p mut Parser) if_expr() ast.IfExpr {
 }
 
 fn (p mut Parser) string_expr() ast.Expr {
+	is_raw := p.tok.kind == .name && p.tok.lit == 'r'
+	is_cstr := p.tok.kind == .name && p.tok.lit == 'c'
+	if is_raw || is_cstr {
+		p.next()
+	}
 	mut node := ast.Expr{}
 	val := p.tok.lit
 	node = ast.StringLiteral{
 		val: val
+		is_raw: is_raw
+		is_c: is_cstr
 	}
 	if p.peek_tok.kind != .str_dollar {
 		p.next()