syntax: implement `delete` as proper operator

Turn `delete` into a proper operator mimicking ECMAScript semantics.

Also ensure to transparently turn deprecated `delete(obj, propname)`
function calls into `delete obj.propname` expressions during compilation.

When strict mode is active, legacy delete() calls throw a syntax error
instead.

Finally drop the `delete()` function from the stdlib as it is shadowed
by the delete operator syntax now.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

1 files changed, 1 insertions, 0 deletions

diff --git a/lexer.c b/lexer.c
index 25a5cf4..84af45d 100644
--- a/lexer.c
+++ b/lexer.c
@@ -141,6 +141,7 @@ static const struct keyword reserved_words[] = {
 	{ TK_ENDWHILE,	"endwhile", 8, { 0 } },
 	{ TK_FUNC,		"function", 8, { 0 } },
 	{ TK_DEFAULT,	"default", 7, { 0 } },
+	{ TK_DELETE,	"delete", 6, { 0 } },
 	{ TK_RETURN,	"return", 6, { 0 } },
 	{ TK_ENDFOR,	"endfor", 6, { 0 } },
 	{ TK_SWITCH,	"switch", 6, { 0 } },