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Validating YAML Tokenization Patterns in monaco-editor

This test suite validates YAML syntax tokenization in the Monaco Editor, ensuring accurate parsing and highlighting of various YAML constructs. The tests comprehensively cover different YAML elements including directives, comments, document markers, and data types.

Test Coverage Overview

The test suite provides extensive coverage of YAML syntax elements and tokenization patterns.

Key areas tested include:

YAML directives and document markers
Comments and string handling
Key-value pairs with different formats
Flow mappings and sequences
Tag handles and anchors
Block scalars and structures

Implementation Analysis

The testing approach uses a structured tokenization framework to verify YAML syntax highlighting.

Implementation features:

Token type verification for each syntax element
Start index validation for precise positioning
Edge case handling for special characters
Nested structure validation

Technical Details

Testing infrastructure includes:

Custom testTokenization runner
TypeScript-based test framework
Token validation utilities
Structured test cases with line and token definitions

Best Practices Demonstrated

The test suite exhibits strong testing practices through comprehensive coverage and structured organization.

Notable practices include:

Systematic test case organization
Explicit token type checking
Edge case coverage for special characters
Detailed validation of syntax highlighting rules

microsoft/monaco-editor

src/basic-languages/yaml/yaml.test.ts

            
import { testTokenization } from '../test/testRunner';

testTokenization('yaml', [
	// YAML directive
	[
		{
			line: '%YAML 1.2',
			tokens: [
				{
					startIndex: 0,
					type: 'meta.directive.yaml'
				}
			]
		}
	],

	// Comments
	[
		{
			line: '#Comment',
			tokens: [
				{
					startIndex: 0,
					type: 'comment.yaml'
				}
			]
		}
	],

	// Document Marker - Directives End
	[
		{
			line: '---',
			tokens: [
				{
					startIndex: 0,
					type: 'operators.directivesEnd.yaml'
				}
			]
		}
	],

	// Document Marker - Document End
	[
		{
			line: '...',
			tokens: [
				{
					startIndex: 0,
					type: 'operators.documentEnd.yaml'
				}
			]
		}
	],

	// Tag Handle
	[
		{
			line: '!<tag:clarkevans.com,2002:invoice>',
			tokens: [
				{
					startIndex: 0,
					type: 'tag.yaml'
				}
			]
		}
	],

	// Key:
	[
		{
			line: 'key:',
			tokens: [
				{
					startIndex: 0,
					type: 'type.yaml'
				},
				{
					startIndex: 3,
					type: 'operators.yaml'
				}
			]
		}
	],

	// Key:Value
	[
		{
			line: 'key: value',
			tokens: [
				{
					startIndex: 0,
					type: 'type.yaml'
				},
				{
					startIndex: 3,
					type: 'operators.yaml'
				},
				{
					startIndex: 4,
					type: 'white.yaml'
				},
				{
					startIndex: 5,
					type: 'string.yaml'
				}
			]
		}
	],

	// Key:Value - Quoted Keys
	[
		{
			line: '":": value',
			tokens: [
				{
					startIndex: 0,
					type: 'type.yaml'
				},
				{
					startIndex: 3,
					type: 'operators.yaml'
				},
				{
					startIndex: 4,
					type: 'white.yaml'
				},
				{
					startIndex: 5,
					type: 'string.yaml'
				}
			]
		}
	],

	// Tag Handles
	[
		{
			line: '!!str string',
			tokens: [
				{
					startIndex: 0,
					type: 'tag.yaml'
				},
				{
					startIndex: 5,
					type: 'white.yaml'
				},
				{
					startIndex: 6,
					type: 'string.yaml'
				}
			]
		}
	],

	// Anchor
	[
		{
			line: 'anchor: &anchor',
			tokens: [
				{
					startIndex: 0,
					type: 'type.yaml'
				},
				{
					startIndex: 6,
					type: 'operators.yaml'
				},
				{
					startIndex: 7,
					type: 'white.yaml'
				},
				{
					startIndex: 8,
					type: 'namespace.yaml'
				}
			]
		}
	],

	// Alias
	[
		{
			line: 'alias: *alias',
			tokens: [
				{
					startIndex: 0,
					type: 'type.yaml'
				},
				{
					startIndex: 5,
					type: 'operators.yaml'
				},
				{
					startIndex: 6,
					type: 'white.yaml'
				},
				{
					startIndex: 7,
					type: 'namespace.yaml'
				}
			]
		}
	],

	//String
	[
		{
			line: "'''",
			tokens: [
				{ startIndex: 0, type: 'string.yaml' },
				{ startIndex: 2, type: 'string.invalid.yaml' }
			]
		}
	],

	// Block Scalar
	[
		{
			line: '>',
			tokens: [
				{
					startIndex: 0,
					type: 'operators.yaml'
				}
			]
		},
		{
			line: '  String',
			tokens: [
				{
					startIndex: 0,
					type: 'string.yaml'
				}
			]
		}
	],

	// Block Structure
	[
		{
			line: '- one',
			tokens: [
				{
					startIndex: 0,
					type: 'operators.yaml'
				},
				{
					startIndex: 1,
					type: 'white.yaml'
				},
				{
					startIndex: 2,
					type: 'string.yaml'
				}
			]
		},
		{
			line: '? two',
			tokens: [
				{
					startIndex: 0,
					type: 'operators.yaml'
				},
				{
					startIndex: 1,
					type: 'white.yaml'
				},
				{
					startIndex: 2,
					type: 'string.yaml'
				}
			]
		},
		{
			line: ': three',
			tokens: [
				{
					startIndex: 0,
					type: 'operators.yaml'
				},
				{
					startIndex: 1,
					type: 'white.yaml'
				},
				{
					startIndex: 2,
					type: 'string.yaml'
				}
			]
		}
	],

	// Flow Mapping
	[
		{
			line: '{key: value, number: 123}',
			tokens: [
				{
					startIndex: 0,
					type: 'delimiter.bracket.yaml'
				},
				{
					startIndex: 1,
					type: 'type.yaml'
				},
				{
					startIndex: 4,
					type: 'operators.yaml'
				},
				{
					startIndex: 5,
					type: 'white.yaml'
				},
				{
					startIndex: 6,
					type: 'string.yaml'
				},
				{
					startIndex: 11,
					type: 'delimiter.comma.yaml'
				},
				{
					startIndex: 12,
					type: 'white.yaml'
				},
				{
					startIndex: 13,
					type: 'type.yaml'
				},
				{
					startIndex: 19,
					type: 'operators.yaml'
				},
				{
					startIndex: 20,
					type: 'white.yaml'
				},
				{
					startIndex: 21,
					type: 'number.yaml'
				},
				{
					startIndex: 24,
					type: 'delimiter.bracket.yaml'
				}
			]
		}
	],

	// Flow Scalars
	[
		{
			line: "'this is a single quote string'",
			tokens: [
				{
					startIndex: 0,
					type: 'string.yaml'
				}
			]
		}
	],

	[
		{
			line: '"this is a double \\quote string\\n"',
			tokens: [
				{
					startIndex: 0,
					type: 'string.yaml'
				},
				{
					startIndex: 18,
					type: 'string.escape.invalid.yaml'
				},
				{
					startIndex: 20,
					type: 'string.yaml'
				},
				{
					startIndex: 31,
					type: 'string.escape.yaml'
				},
				{
					startIndex: 33,
					type: 'string.yaml'
				}
			]
		}
	],

	// Flow Sequence - Data types
	[
		{
			line: '[string,"double",\'single\',1,1.1,2002-04-28]',
			tokens: [
				{
					startIndex: 0,
					type: 'delimiter.square.yaml'
				},
				{
					startIndex: 1,
					type: 'string.yaml'
				},
				{
					startIndex: 7,
					type: 'delimiter.comma.yaml'
				},
				{
					startIndex: 8,
					type: 'string.yaml'
				},
				{
					startIndex: 16,
					type: 'delimiter.comma.yaml'
				},
				{
					startIndex: 17,
					type: 'string.yaml'
				},
				{
					startIndex: 25,
					type: 'delimiter.comma.yaml'
				},
				{
					startIndex: 26,
					type: 'number.yaml'
				},
				{
					startIndex: 27,
					type: 'delimiter.comma.yaml'
				},
				{
					startIndex: 28,
					type: 'number.float.yaml'
				},
				{
					startIndex: 31,
					type: 'delimiter.comma.yaml'
				},
				{
					startIndex: 32,
					type: 'number.date.yaml'
				},
				{
					startIndex: 42,
					type: 'delimiter.square.yaml'
				}
			]
		}
	],
	[
		{
			line: "text: Pretty vector drawing. #this is comment doesn't have proper syntax higlighting",
			tokens: [
				{ startIndex: 0, type: 'type.yaml' },
				{ startIndex: 4, type: 'operators.yaml' },
				{ startIndex: 5, type: 'white.yaml' },
				{ startIndex: 6, type: 'string.yaml' },
				{ startIndex: 28, type: 'white.yaml' },
				{ startIndex: 29, type: 'comment.yaml' }
			]
		}
	],
	[
		{
			line: "number: 3 #this comment also doesn't have proper syntax highlighting",
			tokens: [
				{ startIndex: 0, type: 'type.yaml' },
				{ startIndex: 6, type: 'operators.yaml' },
				{ startIndex: 7, type: 'white.yaml' },
				{ startIndex: 8, type: 'string.yaml' },
				{ startIndex: 9, type: 'white.yaml' },
				{ startIndex: 10, type: 'comment.yaml' }
			]
		}
	],

	// ': ' in double-quoted Value
	[
		{
			line: 'key: "va: lue"',
			tokens: [
				{
					startIndex: 0,
					type: 'type.yaml'
				},
				{
					startIndex: 3,
					type: 'operators.yaml'
				},
				{
					startIndex: 4,
					type: 'white.yaml'
				},
				{
					startIndex: 5,
					type: 'string.yaml'
				}
			]
		}
	],

	// ': ' in single-quoted Value
	[
		{
			line: "key: 'va: lue'",
			tokens: [
				{
					startIndex: 0,
					type: 'type.yaml'
				},
				{
					startIndex: 3,
					type: 'operators.yaml'
				},
				{
					startIndex: 4,
					type: 'white.yaml'
				},
				{
					startIndex: 5,
					type: 'string.yaml'
				}
			]
		}
	],

	// '#' in single-quoted Value
	[
		{
			line: "key: 'va#lue'",
			tokens: [
				{
					startIndex: 0,
					type: 'type.yaml'
				},
				{
					startIndex: 3,
					type: 'operators.yaml'
				},
				{
					startIndex: 4,
					type: 'white.yaml'
				},
				{
					startIndex: 5,
					type: 'string.yaml'
				}
			]
		}
	],

	// '#' in double-quoted Value
	[
		{
			line: 'key: "va#lue"',
			tokens: [
				{
					startIndex: 0,
					type: 'type.yaml'
				},
				{
					startIndex: 3,
					type: 'operators.yaml'
				},
				{
					startIndex: 4,
					type: 'white.yaml'
				},
				{
					startIndex: 5,
					type: 'string.yaml'
				}
			]
		}
	],

	// '#' in  Value
	[
		{
			line: 'key: va#lue',
			tokens: [
				{
					startIndex: 0,
					type: 'type.yaml'
				},
				{
					startIndex: 3,
					type: 'operators.yaml'
				},
				{
					startIndex: 4,
					type: 'white.yaml'
				},
				{
					startIndex: 5,
					type: 'string.yaml'
				}
			]
		}
	],

	// Comment following Value
	[
		{
			line: 'key: value #comment',
			tokens: [
				{
					startIndex: 0,
					type: 'type.yaml'
				},
				{
					startIndex: 3,
					type: 'operators.yaml'
				},
				{
					startIndex: 4,
					type: 'white.yaml'
				},
				{
					startIndex: 5,
					type: 'string.yaml'
				},
				{
					startIndex: 10,
					type: 'white.yaml'
				},
				{
					startIndex: 11,
					type: 'comment.yaml'
				}
			]
		}
	],

	// ': ' in Comment following Value
	[
		{
			line: 'key: value #comment: also comment',
			tokens: [
				{
					startIndex: 0,
					type: 'type.yaml'
				},
				{
					startIndex: 3,
					type: 'operators.yaml'
				},
				{
					startIndex: 4,
					type: 'white.yaml'
				},
				{
					startIndex: 5,
					type: 'string.yaml'
				},
				{
					startIndex: 10,
					type: 'white.yaml'
				},
				{
					startIndex: 11,
					type: 'comment.yaml'
				}
			]
		}
	]
]);