doc/tutorial/basics: add test for tutorial
test whether examples in tutorial produce the desired
results.
Closes #50.
Change-Id: I3c5b8a465e6ed98dad2962efd88ce246173250a6
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/2178
Reviewed-by: Marcel van Lohuizen <mpvl@google.com>
diff --git a/internal/cuetest/chunker.go b/internal/cuetest/chunker.go
new file mode 100644
index 0000000..edcbb1b
--- /dev/null
+++ b/internal/cuetest/chunker.go
@@ -0,0 +1,73 @@
+// Copyright 2019 CUE Authors
+//
+// Licensed 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 cuetest
+
+import (
+ "bytes"
+ "testing"
+)
+
+// A Chunker is used to find segments in text.
+type Chunker struct {
+ t *testing.T
+ b []byte
+ s []byte
+ p int
+}
+
+// NewChunker returns a new chunker.
+func NewChunker(t *testing.T, b []byte) *Chunker {
+ return &Chunker{t: t, b: b}
+}
+
+// Next finds the first occurrence from the current scan position of beg,
+// records the segment from that position until the first occurrence of end
+// and then updates the current position. It reports whether a segment enclosed
+// by beg and end can be found.
+func (c *Chunker) Next(beg, end string) bool {
+ if !c.Find(beg) {
+ return false
+ }
+ if !c.Find(end) {
+ c.t.Fatalf("quotes at position %d not terminated", c.p)
+ }
+ return true
+}
+
+// Text returns the text segment captured by the last call to Next or Find.
+func (c *Chunker) Text() string {
+ return string(c.s)
+}
+
+// Bytes returns the segment captured by the last call to Next or Find.
+func (c *Chunker) Bytes() []byte {
+ return c.s
+}
+
+// Find searches for key from the current position and sets the current segment
+// to the text from current position up till the key's position. If successful,
+// the position is updated to point directly after the occurrence of key.
+func (c *Chunker) Find(key string) bool {
+ p := bytes.Index(c.b, []byte(key))
+ if p == -1 {
+ c.s = c.b
+ return false
+ }
+ c.p += p + len(key)
+ b := c.b
+ c.s = b[:p]
+ c.b = b[p+len(key):]
+ return true
+}
