YAML: Implement block scalar parsing.

This commit implements the parsing of YAML block scalars.
Some code existed for it before, but it couldn't parse block
scalars.

This commit adds a new yaml node type to represent the block
scalar values. 

This commit also deletes the 'spec-09-27' and 'spec-09-28' tests
as they are identical to the test file 'spec-09-26'.

This commit introduces 3 new utility functions to the YAML scanner
class: `skip_s_space`, `advanceWhile` and `consumeLineBreakIfPresent`.

Reviewers: Duncan P. N. Exon Smith

Differential Revision: http://reviews.llvm.org/D9503

llvm-svn: 237314

1 files changed, 27 insertions, 0 deletions

diff --git a/llvm/unittests/Support/YAMLParserTest.cpp b/llvm/unittests/Support/YAMLParserTest.cpp
index 918c205..d3ee8af 100644
--- a/llvm/unittests/Support/YAMLParserTest.cpp
+++ b/llvm/unittests/Support/YAMLParserTest.cpp
@@ -130,6 +130,33 @@ TEST(YAMLParser, ParsesArrayOfArrays) {
   ExpectParseSuccess("Array of arrays", "[[]]");
 }
 
+TEST(YAMLParser, ParsesBlockLiteralScalars) {
+  ExpectParseSuccess("Block literal scalar", "test: |\n  Hello\n  World\n");
+  ExpectParseSuccess("Block literal scalar EOF", "test: |\n  Hello\n  World");
+  ExpectParseSuccess("Empty block literal scalar header EOF", "test: | ");
+  ExpectParseSuccess("Empty block literal scalar", "test: |\ntest2: 20");
+  ExpectParseSuccess("Empty block literal scalar 2", "- | \n  \n\n \n- 42");
+  ExpectParseSuccess("Block literal scalar in sequence",
+                     "- |\n  Testing\n  Out\n\n- 22");
+  ExpectParseSuccess("Block literal scalar in document",
+                     "--- |\n  Document\n...");
+  ExpectParseSuccess("Empty non indented lines still count",
+                     "- |\n  First line\n \n\n  Another line\n\n- 2");
+  ExpectParseSuccess("Comment in block literal scalar header",
+                     "test: | # Comment \n  No Comment\ntest 2: | # Void");
+  ExpectParseSuccess("Chomping indicators in block literal scalar header",
+                     "test: |- \n  Hello\n\ntest 2: |+ \n\n  World\n\n\n");
+  ExpectParseSuccess("Indent indicators in block literal scalar header",
+                     "test: |1 \n  \n Hello \n  World\n");
+  ExpectParseSuccess("Chomping and indent indicators in block literals",
+                     "test: |-1\n Hello\ntest 2: |9+\n         World");
+  ExpectParseSuccess("Trailing comments in block literals",
+                     "test: |\n  Content\n # Trailing\n  #Comment\ntest 2: 3");
+  ExpectParseError("Invalid block scalar header", "test: | failure");
+  ExpectParseError("Invalid line indentation", "test: |\n  First line\n Error");
+  ExpectParseError("Long leading space line", "test: |\n   \n  Test\n");
+}
+
 TEST(YAMLParser, HandlesEndOfFileGracefully) {
   ExpectParseError("In string starting with EOF", "[\"");
   ExpectParseError("In string hitting EOF", "[\"   ");