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Comment:Added a string matching parser.
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Files: files | file ages | folders
SHA1: 893c36d683930cc81427ab01abf66b828947606d
User & Date: spaskalev on 2015-03-19 20:36:20.531
Other Links: manifest | tags
Context
2015-03-19
20:40
Added a test for parse.Defer check-in: b37c997693 user: spaskalev tags: trunk
20:36
Added a string matching parser. check-in: 893c36d683 user: spaskalev tags: trunk
20:17
A simple parser combinator library check-in: 061baeefcb user: spaskalev tags: trunk
Changes
Side-by-Side Diff Ignore Whitespace Patch
Modified src/0dev.org/parse/parse.go from [b38eeb1414] to [6601f36901].
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	return func(s string) (N, string) {
		if len(s) < count {
			return N{Matched: false, Content: "", Nodes: nil}, s
		}
		return N{Matched: true, Content: s[:count], Nodes: nil}, s[count:]
	}
}

// Returns a parser that accepts the specified string
func String(value string) P {
	accept := Accept(len(value))
	return func(s string) (N, string) {
		n, r := accept(s)
		if !n.Matched {
			return n, s
		}
		if n.Content == value {
			return n, r
		}
		return N{Matched: false, Content: "", Nodes: []N{n}}, s
	}
}
Modified src/0dev.org/parse/parse_test.go from [72baa0d593] to [b6485539c4]. 
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package parse

import (
	"testing"
)

func TestAccept(t *testing.T) {
	// Accept(0) will always match :)
	p0 := Accept(0)
	if r, s := p0(""); !r.Matched || r.Content != "" || r.Nodes != nil || s != "" {
		t.Error("Invalid result for Accept's negative test", r)
	if n, r := p0(""); !n.Matched || n.Content != "" || n.Nodes != nil || r != "" {
		t.Error("Invalid result for Accept's negative test", n)
	}
	// Test with a non-zero amount of bytes
	p := Accept(1)
	if r, s := p(""); r.Matched || r.Content != "" || r.Nodes != nil || s != "" {
		t.Error("Invalid result for Accept's negative test", r)
	if n, r := p(""); n.Matched || n.Content != "" || n.Nodes != nil || r != "" {
		t.Error("Invalid result for Accept's negative test", n)
	}
	if r, s := p("a"); !r.Matched || r.Content != "a" || r.Nodes != nil || s != "" {
		t.Error("Invalid result for Accept's positive test", r)
	if n, r := p("a"); !n.Matched || n.Content != "a" || n.Nodes != nil || r != "" {
		t.Error("Invalid result for Accept's positive test", n)
	}
}

func TestK(t *testing.T) {
	p := Accept(1)
	k := K(p)
	if r, s := k("aaa"); !r.Matched || r.Content != "aaa" || r.Nodes == nil || s != "" {
		t.Error("Invalid result for K* match test", r)
	if n, r := k("aaa"); !n.Matched || n.Content != "aaa" || n.Nodes == nil || r != "" {
		t.Error("Invalid result for K* match test", n)
	}
	if r, s := k(""); !r.Matched || r.Content != "" || r.Nodes != nil || s != "" {
		t.Error("Invalid result for K* no-match test", r)
	if n, r := k(""); !n.Matched || n.Content != "" || n.Nodes != nil || r != "" {
		t.Error("Invalid result for K* no-match test", n)
	}
}

func TestSeq(t *testing.T) {
	p1, p2 := Accept(1), Accept(1)
	s := Seq(p1, p2)
	if r, s := s("aa"); !r.Matched || r.Content != "aa" || r.Nodes == nil || s != "" {
		t.Error("Invalid result for Seq positive test", r)
	if n, r := s("aa"); !n.Matched || n.Content != "aa" || n.Nodes == nil || r != "" {
		t.Error("Invalid result for Seq positive test", n)
	}
	if r, s := s("a"); r.Matched || r.Content != "a" || r.Nodes == nil || s != "" {
		t.Error("Invalid result for Seq partial match test", r)
	if n, r := s("a"); n.Matched || n.Content != "a" || n.Nodes == nil || r != "" {
		t.Error("Invalid result for Seq partial match test", n)
	}
	if r, s := s(""); r.Matched || r.Content != "" || r.Nodes == nil || s != "" {
		t.Error("Invalid result for Seq no-match test", r)
	if n, r := s(""); n.Matched || n.Content != "" || n.Nodes == nil || r != "" {
		t.Error("Invalid result for Seq no-match test", n)
	}
}

func TestAny(t *testing.T) {
	p, p0 := Accept(1), Accept(0)
	a := Any(p, p0)
	if r, s := a(""); !r.Matched || r.Content != "" || r.Nodes != nil || s != "" {
		t.Error("Invalid result for Any match test", r)
	if n, r := a(""); !n.Matched || n.Content != "" || n.Nodes != nil || r != "" {
		t.Error("Invalid result for Any match test", n)
	}
	if n, r := a("aa"); !n.Matched || n.Content != "a" || n.Nodes != nil || r != "a" {
		t.Error("Invalid result for Any match test", n)
	}
}
	if r, s := a("aa"); !r.Matched || r.Content != "a" || r.Nodes != nil || s != "a" {
		t.Error("Invalid result for Any match test", r)

func TestString(t *testing.T) {
	s := String("aa")
	if n, r := s("aa"); !n.Matched || n.Content != "aa" || n.Nodes != nil || r != "" {
		t.Error("Invalid result for String match test", n)
	}
	if n, r := s("ab"); n.Matched || n.Content != "" || n.Nodes == nil || r != "ab" {
		t.Error("Invalid result for String no-match test", n, r, len(r))
	}
}
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