ref: 57adc539fc98dcb6fba8070b9611b8bd545f6f7f
parent: b277cb33e4dfa7440fca3b7888026944ce056154
author: Lucas Jenss <[email protected]>
date: Wed Sep 27 20:35:47 EDT 2017
tpl: Add float template function Add a template function that allows conversion to float. This is useful, for example, when passing aspect ratios into templates, which tend to not be integers. Fixes #3307
--- /dev/null
+++ b/docs/content/functions/float.md
@@ -1,0 +1,26 @@
+---
+title: float
+linktitle: float
+description: Creates a `float` from the argument passed into the function.
+godocref:
+date: 2017-09-28
+publishdate: 2017-09-28
+lastmod: 2017-09-28
+categories: [functions]
+menu:
+ docs:
+ parent: "functions"
+keywords: [strings,floats]
+signature: ["float INPUT"]
+workson: []
+hugoversion:
+relatedfuncs: []
+deprecated: false
+aliases: []
+---
+
+Useful for turning strings into floating point numbers.
+
+```
+{{ float "1.23" }} → 1.23+```
--- a/tpl/cast/cast.go
+++ b/tpl/cast/cast.go
@@ -30,6 +30,22 @@
// ToInt converts the given value to an int.
func (ns *Namespace) ToInt(v interface{}) (int, error) {+ v = convertTemplateToString(v)
+ return _cast.ToIntE(v)
+}
+
+// ToString converts the given value to a string.
+func (ns *Namespace) ToString(v interface{}) (string, error) {+ return _cast.ToStringE(v)
+}
+
+// ToFloat converts the given value to a float.
+func (ns *Namespace) ToFloat(v interface{}) (float64, error) {+ v = convertTemplateToString(v)
+ return _cast.ToFloat64E(v)
+}
+
+func convertTemplateToString(v interface{}) interface{} { switch vv := v.(type) {case template.HTML:
v = string(vv)
@@ -42,10 +58,5 @@
case template.JSStr:
v = string(vv)
}
- return _cast.ToIntE(v)
-}
-
-// ToString converts the given value to a string.
-func (ns *Namespace) ToString(v interface{}) (string, error) {- return _cast.ToStringE(v)
+ return v
}
--- a/tpl/cast/cast_test.go
+++ b/tpl/cast/cast_test.go
@@ -81,3 +81,40 @@
assert.Equal(t, test.expect, result, errMsg)
}
}
+
+func TestToFloat(t *testing.T) {+ t.Parallel()
+
+ ns := New()
+
+ for i, test := range []struct {+ v interface{}+ expect interface{}+ }{+ {"1", 1.0},+ {template.HTML("2"), 2.0},+ {template.CSS("3"), 3.0},+ {template.HTMLAttr("4"), 4.0},+ {template.JS("-5.67"), -5.67},+ {template.JSStr("6"), 6.0},+ {"1.23", 1.23},+ {"-1.23", -1.23},+ {"0", 0.0},+ {float64(2.12), 2.12},+ {int64(123), 123.0},+ {2, 2.0},+ {t, false},+ } {+ errMsg := fmt.Sprintf("[%d] %v", i, test.v)+
+ result, err := ns.ToFloat(test.v)
+
+ if b, ok := test.expect.(bool); ok && !b {+ require.Error(t, err, errMsg)
+ continue
+ }
+
+ require.NoError(t, err, errMsg)
+ assert.Equal(t, test.expect, result, errMsg)
+ }
+}
--- a/tpl/cast/init.go
+++ b/tpl/cast/init.go
@@ -43,6 +43,13 @@
},
)
+ ns.AddMethodMapping(ctx.ToFloat,
+ []string{"float"},+ [][2]string{+ {`{{ "1234" | float | printf "%T" }}`, `float64`},+ },
+ )
+
return ns
}