// PrintAST returns string representation of parsed template.
func (tpl *Template) PrintAST() string {
if err := tpl.parse(); err != nil {
return fmt.Sprintf("PARSER ERROR: %s", err)
}
return ast.Print(tpl.program)
}
func TestParser(t *testing.T) {
t.Parallel()
for _, test := range parserTests {
output := ""
node, err := Parse(test.input)
if err == nil {
output = ast.Print(node)
}
if (err != nil) || (test.output != output) {
t.Errorf("Test '%s' failed\ninput:\n\t'%s'\nexpected\n\t%q\ngot\n\t%q\nerror:\n\t%s", test.name, test.input, test.output, output, err)
}
}
}
// package example
func Example() {
source := "You know {{nothing}} John Snow"
// parse template
program, err := Parse(source)
if err != nil {
panic(err)
}
// print AST
output := ast.Print(program)
fmt.Print(output)
// CONTENT[ 'You know ' ]
// {{ PATH:nothing [] }}
// CONTENT[ ' John Snow' ]
}
func TestParserErrors(t *testing.T) {
t.Parallel()
for _, test := range parserErrorTests {
node, err := Parse(test.input)
if err == nil {
output := ast.Print(node)
tokens := lexer.Collect(test.input)
t.Errorf("Test '%s' failed - Error expected\ninput:\n\t'%s'\ngot\n\t%q\ntokens:\n\t%q", test.name, test.input, output, tokens)
} else if test.output != "" {
matched, errMatch := regexp.MatchString(regexp.QuoteMeta(test.output), fmt.Sprint(err))
if errMatch != nil {
panic("Failed to match regexp")
}
if !matched {
t.Errorf("Test '%s' failed - Incorrect error returned\ninput:\n\t'%s'\nexpected\n\t%q\ngot\n\t%q", test.name, test.input, test.output, err)
}
}
}
}