runtime(yaml): improve syntax highlighting for YAML

- Recognize block scalar style to avoid unexpected highlighting by `yamlFlowString` (fix #11517)
- Improve performance of `yamlFlowMappingKey` by allowing execution by the NFA engine (fix #10730)
  - It was intentionally disabled before patterns were optimized by `s:SimplifyToAssumeAllPrintable`.
- Fix detection of flow style mapping indicators (fix #8234).
- Enable highlighting of explicit mapping value indicators and node properties in flow style.
- Add syntax highlighting tests

closes: #14354

Signed-off-by: itchyny <itchyny@cybozu.co.jp>
Signed-off-by: Christian Brabandt <cb@256bit.org>

21 files changed, 596 insertions, 57 deletions

diff --git a/runtime/syntax/testdir/dumps/yaml.yaml_00.dump b/runtime/syntax/testdir/dumps/yaml.yaml_00.dump
new file mode 100644
index 0000000000..3b8fd8183c
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/yaml.yaml_00.dump
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diff --git a/runtime/syntax/testdir/dumps/yaml.yaml_01.dump b/runtime/syntax/testdir/dumps/yaml.yaml_01.dump
new file mode 100644
index 0000000000..027a3c3c5d
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/yaml.yaml_01.dump
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diff --git a/runtime/syntax/testdir/dumps/yaml.yaml_02.dump b/runtime/syntax/testdir/dumps/yaml.yaml_02.dump
new file mode 100644
index 0000000000..b0037c8e1d
--- /dev/null
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diff --git a/runtime/syntax/testdir/dumps/yaml.yaml_03.dump b/runtime/syntax/testdir/dumps/yaml.yaml_03.dump
new file mode 100644
index 0000000000..d16656df5a
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/yaml.yaml_03.dump
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diff --git a/runtime/syntax/testdir/dumps/yaml.yaml_04.dump b/runtime/syntax/testdir/dumps/yaml.yaml_04.dump
new file mode 100644
index 0000000000..6a3aecff6a
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/yaml.yaml_04.dump
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diff --git a/runtime/syntax/testdir/dumps/yaml.yaml_05.dump b/runtime/syntax/testdir/dumps/yaml.yaml_05.dump
new file mode 100644
index 0000000000..c94413e7bb
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/yaml.yaml_05.dump
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diff --git a/runtime/syntax/testdir/dumps/yaml.yaml_06.dump b/runtime/syntax/testdir/dumps/yaml.yaml_06.dump
new file mode 100644
index 0000000000..dcd2e6a610
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diff --git a/runtime/syntax/testdir/dumps/yaml.yaml_07.dump b/runtime/syntax/testdir/dumps/yaml.yaml_07.dump
new file mode 100644
index 0000000000..6ba7ff138c
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/yaml.yaml_07.dump
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