fix: enable complex resource ids in instantiate() (#159)

Author: miraleung

src/main/java/com/google/api/pathtemplate/PathTemplate.java

@@ -200,6 +200,11 @@ private static Segment create(SegmentKind kind, String value) {
       return new AutoValue_PathTemplate_Segment(kind, value, "");
     }
 
+    /** Creates a segment of given kind, value, and complex separator. */
+    private static Segment create(SegmentKind kind, String value, String complexSeparator) {
+      return new AutoValue_PathTemplate_Segment(kind, value, complexSeparator);
+    }
+
     private static Segment wildcardCreate(String complexSeparator) {
       return new AutoValue_PathTemplate_Segment(
           SegmentKind.WILDCARD,
@@ -737,10 +742,13 @@ private String instantiate(Map<String, String> values, boolean allowPartial) {
     boolean continueLast = true; // Whether to not append separator
     boolean skip = false; // Whether we are substituting a binding and segments shall be skipped.
     ListIterator<Segment> iterator = segments.listIterator();
+    String prevSeparator = "";
     while (iterator.hasNext()) {
       Segment seg = iterator.next();
       if (!skip && !continueLast) {
-        result.append(seg.separator());
+        String separator = prevSeparator.isEmpty() ? seg.separator() : prevSeparator;
+        result.append(separator);
+        prevSeparator = seg.complexSeparator().isEmpty() ? seg.separator() : seg.complexSeparator();
       }
       continueLast = false;
       switch (seg.kind()) {
@@ -1066,7 +1074,7 @@ private static List<Segment> parseComplexResourceId(String seg) {
           currIteratorIndex < separatorIndices.size()
               ? separatorIndices.get(currIteratorIndex)
               : "";
-      segments.add(Segment.create(SegmentKind.BINDING, subVarName));
+      segments.add(Segment.create(SegmentKind.BINDING, subVarName, complexDelimiter));
       segments.add(Segment.wildcardCreate(complexDelimiter));
       segments.add(Segment.END_BINDING);
       subVarName = null;

src/test/java/com/google/api/pathtemplate/PathTemplateTest.java

@@ -37,6 +37,7 @@
 import java.util.Arrays;
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.ExpectedException;
@@ -377,6 +378,26 @@ public void complexResourceIdInParent() {
     Truth.assertThat(match.get("cell2")).isEqualTo("broomba");
   }
 
+  @Test
+  public void complexResourcePathTemplateVariables() {
+    String pattern =
+        "projects/{foo}_{bar}/zones/{zone_a}-{zone_b}_{zone_c}/machines/{cell1}.{cell2}";
+    PathTemplate template = PathTemplate.create(pattern);
+    Set<String> variables = template.vars();
+    Truth.assertThat(variables)
+        .containsExactly("foo", "bar", "zone_a", "zone_b", "zone_c", "cell1", "cell2");
+
+    pattern = "projects/{foo}_{bar}/zones/*";
+    template = PathTemplate.create(pattern);
+    Map<String, String> match =
+        template.match("https://www.googleapis.com/compute/v1/projects/foo1_bar2/zones/azone");
+    Truth.assertThat(match).isNotNull();
+    Truth.assertThat(match.get("foo")).isEqualTo("foo1");
+    Truth.assertThat(match.get("bar")).isEqualTo("bar2");
+    variables = template.vars();
+    System.out.println("DEL: vars: " + variables);
+  }
+
   @Test
   public void complexResourceBasicInvalidIds() {
     thrown.expect(ValidationException.class);
@@ -575,6 +596,57 @@ public void instantiateWithUnusualCharactersNoEncoding() {
     Truth.assertThat(instance).isEqualTo("bar/asdf:;`~,.<>[]!@#$%^&*()");
   }
 
+  @Test
+  public void instantiateWithComplexResourceId_basic() {
+    PathTemplate template = PathTemplate.create("projects/{project}/zones/{zone_a}~{zone_b}");
+    String instance =
+        template.instantiate("project", "a/b/c", "zone_a", "apple", "zone_b", "baseball");
+    Truth.assertThat(instance).isEqualTo("projects/a%2Fb%2Fc/zones/apple~baseball");
+  }
+
+  @Test
+  public void instantiateWithComplexResourceId_mixedSeparators() {
+    PathTemplate template =
+        PathTemplate.create(
+            "projects/{project}/zones/{zone_a}~{zone_b}.{zone_c}-{zone_d}~{zone_e}");
+    String instance =
+        template.instantiate(
+            "project",
+            "a/b/c",
+            "zone_a",
+            "apple",
+            "zone_b",
+            "baseball/basketball",
+            "zone_c",
+            "cat/kitty",
+            "zone_d",
+            "dog/hound",
+            "zone_e",
+            "12345");
+    Truth.assertThat(instance)
+        .isEqualTo(
+            "projects/a%2Fb%2Fc/zones/apple~baseball%2Fbasketball.cat%2Fkitty-dog%2Fhound~12345");
+  }
+
+  @Test
+  public void instantiateWithComplexResourceId_mixedSeparatorsInParent() {
+    PathTemplate template =
+        PathTemplate.create("projects/{project_a}~{project_b}.{project_c}/zones/{zone_a}~{zone_b}");
+    String instance =
+        template.instantiate(
+            "project_a",
+            "a/b/c",
+            "project_b",
+            "foo",
+            "project_c",
+            "bar",
+            "zone_a",
+            "apple",
+            "zone_b",
+            "baseball");
+    Truth.assertThat(instance).isEqualTo("projects/a%2Fb%2Fc~foo.bar/zones/apple~baseball");
+  }
+
   // Other
   // =====