v/examples/word_counter/word_counter.v

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// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
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import os
fn main() {
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mut path := 'cinderella.txt'
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if os.args.len != 2 {
println('usage: word_counter [text_file]')
println('using $path')
}
else {
path = os.args[1]
}
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contents := os.read_file(path.trim_space()) or {
println('failed to open $path')
return
}
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mut m := map[string]int{}
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for word in contents.to_lower().split(' ') {
key := filter_word(word)
if key == '' {
continue
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}
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m[key] = m[key] + 1// TODO m[key]++
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}
// Sort the keys
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mut keys := m.keys()
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keys.sort()
// Print the map
for key in keys {
val := m[key]
println('$key => $val')
}
}
// Removes punctuation
fn filter_word(word string) string {
if word == '' || word == ' ' {
return ''
}
mut i := 0
for i < word.len && !is_letter(word[i]) {
i++
}
start := i
for i < word.len && is_letter(word[i]) {
i++
}
end := i
return word.substr(start, end)
}
// TODO remove once it's possible to call word[i].is_letter()
fn is_letter(c byte) bool {
return c.is_letter()
}