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>
diff --git a/runtime/syntax/testdir/input/yaml.yaml b/runtime/syntax/testdir/input/yaml.yaml
new file mode 100644
index 0000000..d87aca2
--- /dev/null
+++ b/runtime/syntax/testdir/input/yaml.yaml
@@ -0,0 +1,127 @@
+%YAML 1.2
+%TAG ! tag:yaml.org,2002: # primary tag handle
+%TAG !! tag:yaml.org,2002: # secondary tag handle
+%TAG !yaml! tag:yaml.org,2002: # named tag handle
+---
+- !str 0 # primary tag handle
+- !!str 0 # secondary tag handle
+- !yaml!str 0 # named tag handle
+---
+
+boolean: [false, true, FALSE, TRUE, False, True]
+null: [null, ~,]
+integer: [12345, -12_345, +12_345]
+float: [
+ 12345.15, -12_345.15, +12_345.15, 1.23015e+3,
+ -12_345.15e+10, +12_345.15e-10, 1.234_515e-10
+]
+binary: [0b101010, -0b1010_1010, +0b1010_1010]
+octal: [0777, 0o777, +0777, -0o777]
+hexadecimal: [0xFEFF_0000, -0xabcd_ef00, +0x1234_5678]
+sexagesimal: [10:20:30, -19:29:39, +19:29:39]
+infinity: [.inf, -.Inf, +.INF]
+not a number: [.nan, .NaN, .NAN]
+
+plain strings:
+ - a b c
+ - a * b & c @ d# e : f # comment
+ - {{ f(' ') }} #8234
+double quoted strings:
+ - ""
+ - "a b c": "d e f" # comment
+ - "\\\"\a\b\f\n\r\t\v\0\_\ \N\L\P\x41\u0041\U00000041"
+single quoted strings:
+ - ''
+ - 'a b c': 'd e f' # comment
+ - 'a''b''c'
+
+block folded string: >
+ foo
+ bar: 1
+
+ baz: null
+
+ "qux"
+block literal string: |
+ foo
+ bar: 1
+
+ baz: null
+
+ 'qux'
+
+chomping strings:
+ - block folded string: >- # comment
+ foo
+ bar: 1
+ - block literal string: |+ # comment
+ foo
+ bar: 1
+ - |- #11517
+ foo "\"
+ bar: 1
+block indentation indicator:
+ - block folded string: >1 # comment
+ foo
+ bar: 1
+ - block literal string: |1- # comment
+ foo
+ bar: 1
+ - |-1 # comment
+ foo
+ bar: 1
+
+flow collection:
+ empty sequence: []
+ empty mapping: {}
+ flow sequence: [foo, bar, baz]
+ flow mapping: {foo: bar, baz: qux}
+ flow string:
+ foo
+ bar
+ baz
+ "double quoted \" string": "
+ foo
+ bar
+ baz"
+ 'single quoted '' string': '
+ foo
+ bar
+ baz'
+ inside block mapping:
+ foo: {bar: baz}
+ bar: ["foo": {baz: qux}]
+ flow collection: [foo # comment
+ , {bar: [{ # comment
+ baz: '
+ qux # not comment
+ ' # comment
+ }]}]
+
+explicit mapping:
+ ? foo # comment
+ : bar # comment
+ ? - foo
+ - bar
+ : - baz
+ - qux
+ ? [1, 2, 3]
+ : ? 1
+ : one
+ ? 2
+ : - ? 3
+ : three
+ - {?4: four, ? 5: five, ? # comment
+ 6: # comment
+ {7:seven}}
+
+mapping merge:
+ foo: &foo
+ bar: baz
+ bar:
+ <<: *foo
+ baz: &bar
+ foo: [*foo]
+ qux:
+ <<: [*foo, *bar]
+ baz: {<<: *foo, qux: [{<< : *foo}]}