92 lines
2.9 KiB
Go
92 lines
2.9 KiB
Go
// This is the same as the example helloWorldUsingParser1, except that in
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// this implementation the state machine is implemented using a combination
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// of some TokenHandlers and only a single state, in which multiple
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// ParseAPI.On() calls are combined to do all the work in one go.
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package parsekit_test
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import (
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"fmt"
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"git.makaay.nl/mauricem/go-parsekit"
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)
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const greeteeItem2 parsekit.ItemType = 1
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func stateFullGreeting(p *parsekit.ParseAPI) {
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c, a, m := parsekit.C, parsekit.A, parsekit.M
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if !p.On(c.StrNoCase("hello")).Skip() {
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p.EmitError("the greeting is not being friendly")
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return
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}
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if !p.On(c.Seq(c.Opt(a.Whitespace), a.Comma, c.Opt(a.Whitespace))).Skip() {
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p.EmitError("the greeting is not properly separated")
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return
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}
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if !p.On(m.Trim(c.OneOrMore(c.Except(a.Excl, a.AnyRune)), " \t")).Accept() {
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p.EmitError("the greeting is targeted at thin air")
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return
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}
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if !p.On(a.Excl).Stay() {
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p.EmitError("the greeting is not loud enough")
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return
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}
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if !p.On(a.EndOfFile).Stay() {
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p.EmitError("too much stuff going on after the closing '!'")
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return
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}
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name := p.BufLiteral()
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if name == "" {
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p.EmitError("the name cannot be empty")
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} else {
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p.Emit(greeteeItem, name)
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}
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p.ExpectEndOfFile()
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}
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func Example_helloWorldUsingParser2() {
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parser := parsekit.NewParser(stateFullGreeting)
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for i, input := range []string{
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"Hello, world!",
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"HELLO ,Johnny!",
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"hello , Bob123!",
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"hello Pizza!",
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"",
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" ",
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"hello",
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"hello,",
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"hello , ",
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"hello , Droopy",
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"hello , Droopy!",
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"hello , \t \t Droopy \t !",
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"Oh no!",
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"hello,!",
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"HELLO, Buster! Eat this!",
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} {
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item, err, ok := parser.Parse(input).Next()
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if !ok {
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fmt.Printf("[%d] Input: %q Error: %s\n", i, input, err)
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} else {
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fmt.Printf("[%d] Input: %q Output: %s\n", i, input, item.Value)
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}
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}
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// Output:
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// [0] Input: "Hello, world!" Error: too much stuff going on after the closing '!'
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// [1] Input: "HELLO ,Johnny!" Error: too much stuff going on after the closing '!'
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// [2] Input: "hello , Bob123!" Error: too much stuff going on after the closing '!'
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// [3] Input: "hello Pizza!" Error: the greeting is not properly separated
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// [4] Input: "" Error: the greeting is not being friendly
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// [5] Input: " " Error: the greeting is not being friendly
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// [6] Input: "hello" Error: the greeting is not properly separated
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// [7] Input: "hello," Error: the greeting is targeted at thin air
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// [8] Input: "hello , " Error: the greeting is targeted at thin air
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// [9] Input: "hello , Droopy" Error: the greeting is not loud enough
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// [10] Input: "hello , Droopy!" Error: too much stuff going on after the closing '!'
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// [11] Input: "hello , \t \t Droopy \t !" Error: too much stuff going on after the closing '!'
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// [12] Input: "Oh no!" Error: the greeting is not being friendly
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// [13] Input: "hello,!" Error: the greeting is targeted at thin air
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// [14] Input: "HELLO, Buster! Eat this!" Error: too much stuff going on after the closing '!'
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}
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