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autocomplete.go
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autocomplete.go
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// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to You under the Apache License, Version 2.0
// (the "License"); you may not use this file except in compliance with
// the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"context"
"flag"
"os"
"regexp"
"github.com/apache/beam/sdks/go/pkg/beam"
"github.com/apache/beam/sdks/go/pkg/beam/io/textio"
"github.com/apache/beam/sdks/go/pkg/beam/log"
"github.com/apache/beam/sdks/go/pkg/beam/transforms/top"
"github.com/apache/beam/sdks/go/pkg/beam/x/beamx"
"github.com/apache/beam/sdks/go/pkg/beam/x/debug"
)
// TODO(herohde) 5/30/2017: fully implement https://github.com/apache/beam/blob/master/examples/java/src/main/java/org/apache/beam/examples/complete/AutoComplete.java
var (
input = flag.String("input", os.ExpandEnv("$GOPATH/src/github.com/apache/beam/sdks/go/data/haiku/old_pond.txt"), "Files to read.")
n = flag.Int("top", 3, "Number of completions")
)
var wordRE = regexp.MustCompile(`[a-zA-Z]+('[a-z])?`)
func extractFn(line string, emit func(string)) {
for _, word := range wordRE.FindAllString(line, -1) {
emit(word)
}
}
func main() {
flag.Parse()
beam.Init()
ctx := context.Background()
log.Info(ctx, "Running autocomplete")
p := beam.NewPipeline()
s := p.Root()
lines, err := textio.Immediate(s, *input)
if err != nil {
log.Exitf(ctx, "Failed to read %v: %v", *input, err)
}
words := beam.ParDo(s, extractFn, lines)
hits := top.Largest(s, words, *n, func(a, b string) bool {
return len(a) < len(b)
})
debug.Print(s, hits)
if err := beamx.Run(ctx, p); err != nil {
log.Exitf(ctx, "Failed to execute job: %v", err)
}
}