[template-glib] expr: add support or linewise comments

[Christian Hergert <chergert src gnome org>]

commit 2749e786050b00d8febe62cdf906df6ad4dd393f
Author: Christian Hergert <chergert redhat com>
Date:   Wed May 4 15:01:17 2022 -0700

    expr: add support or linewise comments
    
    Like python you can do # some comment

 src/tmpl-expr-scanner.l | 3 ++-
 tests/test1.script      | 2 ++
 2 files changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/src/tmpl-expr-scanner.l b/src/tmpl-expr-scanner.l
index 72ad036..4f92739 100644
--- a/src/tmpl-expr-scanner.l
+++ b/src/tmpl-expr-scanner.l
@@ -114,7 +114,8 @@ L?\"(\\.|[^\\"])*\" { yylval->s = copy_literal (yytext); return STRING_LITERAL;
 "."?[0-9]+{EXP}? { yylval->d = atof(yytext); return NUMBER; }
 
 "//".*
-[ \t] /* ignore whitespace */
+[ \t]   /* ignore whitespace */
+#[^\n]* /* ignore line comments */
 "\n"    { return EOL; }
 <<EOF>> { parser->reached_eof = TRUE; return EOL; }
 .       {
diff --git a/tests/test1.script b/tests/test1.script
index 0f99478..5f89abd 100644
--- a/tests/test1.script
+++ b/tests/test1.script
@@ -18,6 +18,8 @@ assert(abc == "abc")
 assert(abc != "abc\n")
 assert(abc != "def")
 
+# we can't do builtins yet w/ >1 param so this is a
+# very bad pow() implementation that works on integers only.
 func pow(a,b) = while b > 1 do a = a * a; b = b - 1;
 assert(pow(2,3) == 8)