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POtext/template issue Parse() vs. ParseFiles()
 

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  1. POtext/template issue Parse() vs. ParseFiles()
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    <p>I'm trying to do some simple work with the text/template package. The sample given at the top of <a href="http://golang.org/pkg/text/template/" rel="nofollow">template</a> is what I'm working with.</p> <p>How do I write the 'parsed' file so <code>template.ParseFiles()</code> properly reads and executes it?</p> <pre><code>package main import ( "text/template" "os" ) type Inventory struct { Material string Count uint } func main() { sweaters := Inventory{"wool", 17} tmpl, err := template.New("test").Parse("{{.Count}} items are made of {{.Material}}") // tmpl, err := template.New("test").ParseFiles("file.txt") if err != nil { panic(err) } err = tmpl.Execute(os.Stdout, sweaters) if err != nil { panic(err) } } /* Contents of file.txt: {{.Count}} items are made of {{.Material}} Error thrown: panic: template: test:1: "test" is an incomplete or empty template goroutine 1 [running]: main.main() /tmp/templates/t.go:19 +0x21a goroutine 2 [syscall]: created by runtime.main /var/tmp/portage/dev-lang/go-1.0.1/work/go/src/pkg/runtime/proc.c:221 */ </code></pre> <p>I have a copy of this code posted at the golang playground <a href="http://play.golang.org/p/C3oTaFFRmp" rel="nofollow">here</a></p> <p>Edit #1: I've been doing some research on this issue... since it's the <code>Execute()</code> method that actually throws the exception, and not the <code>ParseFiles()</code> part, I checked the method definition:</p> <pre><code>// Execute applies a parsed template to the specified data object, // and writes the output to wr. func (t *Template) Execute(wr io.Writer, data interface{}) (err error) { defer errRecover(&amp;err) value := reflect.ValueOf(data) state := &amp;state{ tmpl: t, wr: wr, line: 1, vars: []variable{{"$", value}}, } if t.Tree == nil || t.Root == nil { state.errorf("%q is an incomplete or empty template", t.name) } state.walk(value, t.Root) return } </code></pre> <p>So, on a hunch, I dumped the value of t.Tree for the inline 'non-file' style, tmpl is: <code>&amp;parse.Tree{Name:"test", Root:(*parse.ListNode)(0xf840030700), funcs:[]map[string]interface {}(nil), lex:(*parse.lexer)(nil), token:[2]parse.item{parse.item{typ:6, val:""}, parse.item{typ:9, val:"{{"}}, peekCount:1, vars:[]string(nil)}</code> and when ran with <code>ParseFiles()</code>, tmpl is: <code>(*parse.Tree)(nil)</code>. I find it odd that one is a dereference, and one value is a pointer. This may help solve the riddle</p>
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    1. USdeft_code
    1. USEvan Plumlee
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      1. POtext/template issue Parse() vs. ParseFiles()
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    2. VO
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    1. CONote, the interesting thing about this example, and other `ParseFiles()` tests I've done, they don't fail on parsing, they fail when they get to the Execute() phase, always with the **incomplete or empty template** message
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      1. POtext/template issue Parse() vs. ParseFiles()
      1. USEvan Plumlee
    2. COYour linked golang playground example works for me. Are you sure this is actually broken?
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      1. POtext/template issue Parse() vs. ParseFiles()
      1. USJeremy Wall
    3. COYes, it works fine, because you don't have access to a filesystem on the playground. However, if you uncomment the `ParseFiles()` line, comment out the other `Parse()` line run it locally, you'll see the error that I have in the comments in the code.
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      1. POtext/template issue Parse() vs. ParseFiles()
      1. USEvan Plumlee
 

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