compiler: update to get vweb working

vlib/compiler/parser.v

@@ -89,6 +89,16 @@ const (
 	}
 )
 
+struct ParserState {
+	scanner_text string
+	tokens       []Token
+	token_idx    int
+	tok          TokenKind
+	prev_tok     TokenKind
+	prev_tok2    TokenKind
+	lit          string
+}
+
 // new parser from string. unique id specified in `id`.
 // tip: use a hashing function to auto generate `id` from `text` eg. sha1.hexhash(text)
 fn (v mut V) new_parser_from_string(text string) Parser {
@@ -265,6 +275,34 @@ fn (p &Parser) log(s string) {
 */
 }
 
+pub fn (p mut Parser) save_state() ParserState {
+	return ParserState{
+		scanner_text : p.scanner.text
+		tokens       : p.tokens
+		token_idx    : p.token_idx
+		tok          : p.tok
+		prev_tok     : p.prev_tok
+		prev_tok2    : p.prev_tok2
+		lit          : p.lit
+	}
+}
+
+pub fn (p mut Parser) restore_state(state ParserState) {
+	p.scanner.text = state.scanner_text
+	p.tokens       = state.tokens
+	p.token_idx    = state.token_idx
+	p.tok          = state.tok
+	p.prev_tok     = state.prev_tok
+	p.prev_tok2    = state.prev_tok2
+	p.lit          = state.lit
+}
+
+fn (p mut Parser) clear_state() {
+	p.tokens = []
+	p.token_idx = 0
+	p.scanner.text = ''
+}
+
 pub fn (p mut Parser) add_text(text string) {
 	if p.tokens.len > 1 && p.tokens[p.tokens.len-1].tok == .eof {
 		p.tokens.delete(p.tokens.len-1)
@@ -273,6 +311,18 @@ pub fn (p mut Parser) add_text(text string) {
 	p.scan_tokens()
 }
 
+fn (p mut Parser) statements_from_text(text string, rcbr bool) {
+	saved_state := p.save_state()
+	p.clear_state()
+	p.add_text(text)
+	if rcbr {
+		p.statements()
+	} else {
+		p.statements_no_rcbr()
+	}
+	p.restore_state(saved_state)
+}
+
 fn (p mut Parser) parse(pass Pass) {
 	p.cgen.line = 0
 	p.cgen.file = cescaped_path(os.realpath(p.file_path))