[template-glib] expr: implement abs() builtin

[Christian Hergert <chergert src gnome org>]

commit 58275f7204d56680f06fd09f88af87e23d4dd7c3
Author: Christian Hergert <chergert redhat com>
Date:   Wed May 4 14:37:16 2022 -0700

    expr: implement abs() builtin
    
    And test it in test1.script

 src/tmpl-expr-eval.c    | 39 ++++++++++++++++++++++++++++++++++++++-
 src/tmpl-expr-scanner.l |  1 +
 tests/test1.script      | 14 +++++++++++++-
 3 files changed, 52 insertions(+), 2 deletions(-)
---
diff --git a/src/tmpl-expr-eval.c b/src/tmpl-expr-eval.c
index c7d3cc5..9927416 100644
--- a/src/tmpl-expr-eval.c
+++ b/src/tmpl-expr-eval.c
@@ -1673,7 +1673,44 @@ builtin_abs (const GValue  *value,
              GValue        *return_value,
              GError       **error)
 {
-  throw_type_mismatch (error, value, NULL, "not implemented");
+  char *errmsg;
+
+  if (G_VALUE_HOLDS_DOUBLE (value))
+    {
+      g_value_init (return_value, G_TYPE_DOUBLE);
+      g_value_set_double (return_value, ABS (g_value_get_double (value)));
+      return TRUE;
+    }
+  else if (G_VALUE_HOLDS_FLOAT (value))
+    {
+      g_value_init (return_value, G_TYPE_FLOAT);
+      g_value_set_float (return_value, ABS (g_value_get_float (value)));
+      return TRUE;
+    }
+  else if (G_VALUE_HOLDS_INT (value))
+    {
+      g_value_init (return_value, G_TYPE_INT);
+      g_value_set_int (return_value, ABS (g_value_get_int (value)));
+      return TRUE;
+    }
+  else if (G_VALUE_HOLDS_INT64 (value))
+    {
+      g_value_init (return_value, G_TYPE_INT64);
+      g_value_set_int64 (return_value, ABS (g_value_get_int64 (value)));
+      return TRUE;
+    }
+  else if (G_VALUE_HOLDS_UINT (value) ||
+           G_VALUE_HOLDS_UINT64 (value) ||
+           G_VALUE_HOLDS_UCHAR (value))
+    {
+      *return_value = *value;
+      return TRUE;
+    }
+
+  errmsg = g_strdup_printf ("Cannot abs() type %s", G_VALUE_TYPE_NAME (value));
+  throw_type_mismatch (error, value, NULL, errmsg);
+  g_free (errmsg);
+
   return FALSE;
 }
 
diff --git a/src/tmpl-expr-scanner.l b/src/tmpl-expr-scanner.l
index c4580f5..0a787d4 100644
--- a/src/tmpl-expr-scanner.l
+++ b/src/tmpl-expr-scanner.l
@@ -82,6 +82,7 @@ TmplExprParser *parser = yyextra;
 
  /* builtin functions */
 "assert" { yylval->fn = TMPL_EXPR_BUILTIN_ASSERT; return BUILTIN; }
+"abs"    { yylval->fn = TMPL_EXPR_BUILTIN_ABS; return BUILTIN; }
 "ceil"   { yylval->fn = TMPL_EXPR_BUILTIN_CEIL; return BUILTIN; }
 "floor"  { yylval->fn = TMPL_EXPR_BUILTIN_FLOOR; return BUILTIN; }
 "hex"    { yylval->fn = TMPL_EXPR_BUILTIN_HEX; return BUILTIN; }
diff --git a/tests/test1.script b/tests/test1.script
index 54fda20..46e90da 100644
--- a/tests/test1.script
+++ b/tests/test1.script
@@ -5,6 +5,18 @@ assert(true)
 assert(true != false)
 assert(!false)
 
+assert(123 == 123)
+assert(123 != 124)
+assert(123 != -123)
+assert(123 == abs(-123))
+
+abc = "abc"
+assert(abc == "abc")
+assert(abc != "abc\n")
+assert(abc != "def")
+
 func multiply(x,y) = x * y;
+assert(multiply(10, 10) == 100)
+assert(multiply(-10, 10) == -100)
 
-multiply(617, 2)
+1234;