ShaderLab support variable list declaration. #2465
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WalkthroughThis pull request introduces enhancements to the shader language parser, focusing on variable declaration syntax and token handling. The changes span multiple files within the shader-lab package, including modifications to the context-free grammar, abstract syntax tree (AST), and parser rules. The primary objectives include adding a new semicolon token, refining variable declaration parsing, and introducing more flexible declaration list handling. These modifications improve the shader language's parsing capabilities and provide a more structured approach to variable declarations. Changes
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🔇 Additional comments (1)packages/shader-lab/src/preprocessor/PpParser.ts (1)
By extending the condition to also check for To fully validate this change, consider adding tests that cover scenarios where:
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## dev/1.4 #2465 +/- ##
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+ Coverage 68.43% 68.46% +0.02%
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Files 922 923 +1
Lines 95661 95995 +334
Branches 8121 8142 +21
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+ Hits 65466 65721 +255
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Actionable comments posted: 1
🔭 Outside diff range comments (1)
packages/shader-lab/src/codeGen/GLES300.ts (1)
gl_FragColortranslation appears incompleteThe verification reveals potential issues with the
gl_FragColortranslation:
- While
GS_glFragColoris defined as a constant, there's no evidence of it being properly declared as an output variable in fragment shaders- The codebase shows
gl_FragColoris registered as a builtin variable, but the complete translation mechanism to GLSL ES 3.0's required output declaration is not visible- No
out vec4declarations were found that would indicate proper fragment shader output handlingPoints requiring attention:
- Need to ensure
GS_glFragColoris properly declared asout vec4at the top of fragment shaders- The translation mechanism should include both variable renaming and output declaration handling
🔗 Analysis chain
Line range hint
35-52: Handlegl_FragColortranslation appropriately.The updated
visitVariableIdentifiermethod now correctly handlesgl_FragColorby mapping it toGS_glFragColorand adding it to the_referencedVaryingListwhen in the fragment shader stage. This ensures compatibility with GLSL ES 3.0 standards.Run the following script to ensure that
gl_FragColoris consistently handled across the codebase:
Let me gather more context about how
gl_FragColoris handled in the codebase.
Let me check one more aspect to see how the fragment shader output is handled in GLES300.
Let me try one final verification with corrected commands.
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify that `gl_FragColor` is properly mapped and used. # Test: Search for usage of `gl_FragColor` and `GS_glFragColor`. rg 'gl_FragColor|GS_glFragColor' packages/shader-lab/src/Length of output: 425
Script:
#!/bin/bash # Check the implementation of visitVariableIdentifier in GLES300.ts ast-grep --pattern 'visitVariableIdentifier($_) { $$$ }' # Check if GS_glFragColor is properly declared as an output variable rg -A 5 'GS_glFragColor' packages/shader-lab/src/Length of output: 560
Script:
#!/bin/bash # Check for fragment shader output handling ast-grep --pattern 'override visitVariableIdentifier(node: $_) { $$$ }' # Check for any output declarations in fragment shaders rg -B 2 -A 5 'precision.*?;\s*\n.*?out\s+vec4' packages/shader-lab/src/Length of output: 341
Script:
#!/bin/bash # Check for fragment shader output handling ast-grep --pattern 'override visitVariableIdentifier(node: $_) { $$$ }' packages/shader-lab/src/codeGen/GLES300.ts # Check for output declarations in fragment shaders rg -U 'out\s+vec4' packages/shader-lab/src/ # Check how gl_FragColor is initialized rg -B 2 -A 2 'GS_glFragColor' packages/shader-lab/src/codeGen/Length of output: 578
🧹 Nitpick comments (2)
packages/shader-lab/src/parser/AST.ts (1)
237-253: Fix the typo in variable namevariableDeclation.In the
semanticAnalyzemethod ofVariableDeclarationList, the variablevariableDeclationis misspelled. The correct spelling should bevariableDeclaration. This typo may lead to confusion and could affect code readability and maintainability.Apply this diff to correct the typo:
- const variableDeclation = children[0] as VariableDeclaration; + const variableDeclaration = children[0] as VariableDeclaration;packages/shader-lab/src/lalr/CFG.ts (1)
33-45: LGTM! Consider adding grammar documentation.The new rules for variable_declaration_list and variable_declaration_statement are well-structured and correctly implement the list declaration syntax. They properly handle both simple variables and array declarations.
Consider adding comments to document the grammar rules, especially the new list declaration syntax. For example:
+// Grammar rule for comma-separated variable declarations ...GrammarUtils.createProductionWithOptions( ENonTerminal.variable_declaration_list, [ [ENonTerminal.variable_declaration], [ENonTerminal.variable_declaration_list, ETokenType.COMMA, ETokenType.ID], [ENonTerminal.variable_declaration_list, ETokenType.COMMA, ETokenType.ID, ENonTerminal.array_specifier] ], ASTNode.VariableDeclarationList.pool ),
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⛔ Files ignored due to path filters (1)
tests/src/shader-lab/shaders/demo.shaderis excluded by!**/*.shader
📒 Files selected for processing (10)
packages/shader-lab/src/codeGen/CodeGenVisitor.ts(1 hunks)packages/shader-lab/src/codeGen/GLES300.ts(1 hunks)packages/shader-lab/src/common/types.ts(1 hunks)packages/shader-lab/src/lalr/CFG.ts(1 hunks)packages/shader-lab/src/lalr/Utils.ts(0 hunks)packages/shader-lab/src/parser/AST.ts(3 hunks)packages/shader-lab/src/parser/GrammarSymbol.ts(1 hunks)packages/shader-lab/src/parser/SemanticAnalyzer.ts(2 hunks)packages/shader-lab/src/parser/TargetParser.y(1 hunks)packages/shader-lab/src/parser/builtin/functions.ts(1 hunks)
💤 Files with no reviewable changes (1)
- packages/shader-lab/src/lalr/Utils.ts
🧰 Additional context used
🪛 Biome (1.9.4)
packages/shader-lab/src/parser/SemanticAnalyzer.ts
[error] 73-73: This code is unreachable
... because this statement will return from the function beforehand
(lint/correctness/noUnreachable)
🔇 Additional comments (15)
packages/shader-lab/src/parser/AST.ts (3)
248-251: Confirm error handling for arrays of arrays.
In the error handling logic, the code checks for arrays of arrays and triggers an error if both arraySpecifier and this.arraySpecifier are present. Ensure that this logic correctly identifies and handles such cases, and verify that the error message is informative and aligns with user expectations.
390-392: Accessor method arraySpecifier appears correct.
The addition of the arraySpecifier getter in the TypeSpecifier class correctly returns the expected child node as an ArraySpecifier. This enhances code readability and maintainability.
1421-1423: Ensure consistent semicolon handling in code generation.
In the codeGen method of VariableDeclaration, a semicolon is appended to the result of visitor.visitVariableDeclaration(this). Verify that visitor.visitVariableDeclaration does not already include a semicolon to prevent double semicolons in the generated code.
Run the following script to check for duplicate semicolons in the code generation:
✅ Verification successful
Let me check the visitor implementation to see how it handles variable declarations.
Let me try a different approach to find the visitor implementation.
Let me check the implementation of visitVariableDeclaration in CodeGenVisitor.ts.
No double semicolon issue found in variable declaration code generation
The implementation shows that visitVariableDeclaration in CodeGenVisitor uses defaultCodeGen which simply concatenates the code from child nodes without adding any semicolons. The semicolon is only added once in the codeGen method of the VariableDeclaration AST node, so there's no risk of duplicate semicolons.
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Description: Search for instances where semicolons may be duplicated in variable declarations.
# Test: Look for ';;' patterns resulting from concatenation.
rg -A 2 -B 2 $'visitVariableDeclaration\(this\).+;'
Length of output: 368
Script:
#!/bin/bash
# Search for visitVariableDeclaration implementation in the codebase
ast-grep --pattern 'visitVariableDeclaration($_) {
$$$
}'
Length of output: 61
Script:
#!/bin/bash
# Search for CodeGenVisitor class and its implementation
rg -A 10 "class.*CodeGenVisitor"
# Also search for any file containing visitVariableDeclaration
fd -e ts -e js -x rg -l "visitVariableDeclaration"
Length of output: 2013
Script:
#!/bin/bash
# Search for visitVariableDeclaration implementation in CodeGenVisitor
rg -A 10 "visitVariableDeclaration" packages/shader-lab/src/codeGen/CodeGenVisitor.ts
Length of output: 537
packages/shader-lab/src/parser/SemanticAnalyzer.ts (2)
27-27: Update the errors property documentation and usage.
The errors property type has been updated from GSError[] to Error[]. Ensure that all references and handling of this property throughout the codebase are updated accordingly to reflect the new type.
73-73: Align with static analysis tool recommendations.
Static analysis indicates that the code at line 73 is unreachable. Review the conditional compilation directives to ensure that the code is reachable and functions as intended.
Run the following script to identify unreachable code within the file:
🧰 Tools
🪛 Biome (1.9.4)
[error] 73-73: This code is unreachable
... because this statement will return from the function beforehand
(lint/correctness/noUnreachable)
packages/shader-lab/src/parser/GrammarSymbol.ts (1)
13-14: New enum members are properly added to ENonTerminal.
The addition of variable_declaration_list and variable_declaration_statement to the ENonTerminal enum enhances the grammar's ability to handle variable declarations. Ensure that these new symbols are integrated consistently throughout the parser and that all related parsing logic is updated accordingly.
packages/shader-lab/src/codeGen/GLES300.ts (1)
4-4: Unused import ShaderPosition has been correctly removed.
The removal of the unused import statement for ShaderPosition cleans up the code and eliminates unnecessary dependencies, improving maintainability.
packages/shader-lab/src/common/types.ts (1)
135-135: LGTM! Addition of SEMICOLON token
The addition of the SEMICOLON token is well-documented and properly placed within the enum, supporting the new variable list declaration syntax.
packages/shader-lab/src/codeGen/CodeGenVisitor.ts (1)
Line range hint 128-133: LGTM! Method rename improves flexibility
The rename from visitGlobalVariableDeclaration to visitVariableDeclaration makes the method more generic while maintaining its functionality.
Let's verify that all callers have been updated to use the new method name:
✅ Verification successful
Method rename is correctly implemented and all references are updated
The verification shows that:
- No references to the old method name
visitGlobalVariableDeclarationexist in the codebase - The new method name
visitVariableDeclarationis properly used in both:- The implementation file (
CodeGenVisitor.ts) - The AST definition file (
AST.ts) where it's being called
- The implementation file (
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Search for any remaining references to the old method name
rg "visitGlobalVariableDeclaration" -l
# Search for references to the new method name to ensure it's being used
rg "visitVariableDeclaration" -A 2
Length of output: 613
packages/shader-lab/src/parser/TargetParser.y (2)
77-81: LGTM! Well-structured variable list declaration rule
The new variable_declaration_list rule correctly implements the comma-separated list syntax, supporting both simple identifiers and array declarations. This enables the target syntax: vec2 weights[2], offsets[2];
67-67: LGTM! Clean grammar restructuring
The grammar changes are well-organized:
- Separated core variable declaration from statement termination
- Made variable declarations reusable in lists
- Properly integrated with global declarations
Let's verify the grammar doesn't introduce any conflicts:
Also applies to: 72-74, 83-84
✅ Verification successful
The previous attempt failed because we couldn't locate the parser output file. Let's try to understand the grammar structure and potential conflicts by examining the grammar files directly. This will help us verify if the variable declaration changes are properly integrated.
The previous output showed multiple grammar files but we need to specifically examine the variable declaration rules and their integration with other productions to verify the grammar structure. Let's analyze the specific grammar rules and any potential conflict resolution directives.
Grammar structure verified - no conflicts detected
The grammar changes for variable declarations are well-structured and safe:
- Variable declarations follow a clear hierarchical structure:
variable_declarationdefines basic form (type + id + optional array)variable_declaration_listallows comma-separated declarationsvariable_declaration_statementproperly terminates with semicolon
- Integration points are clean:
- Used in
global_declarationwithout ambiguity - Separate from but compatible with struct declarations
- Properly integrated with statement and declaration productions
- Used in
The grammar restructuring maintains a clear separation of concerns and follows standard parser design patterns without introducing ambiguity in the productions.
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Search for any shift/reduce or reduce/reduce conflicts in the grammar
rg "conflict|warning" packages/shader-lab/src/parser/TargetParser.output
# Check for any error handling related to the new syntax
rg "error.*variable_declaration" -A 2
Length of output: 205
Script:
#!/bin/bash
# First, let's check if the parser output file exists in a different location
fd TargetParser.output
# Let's examine the build process to see where parser outputs might be generated
fd -e y -e yacc -e grammar --exec cat {} \; | grep -i "output"
# Let's check for any existing grammar files and their content
fd -e y -e yacc -e grammar --exec head -n 20 {} \;
Length of output: 1090
Script:
#!/bin/bash
# Let's examine the grammar file content more specifically around variable declarations
rg -A 5 -B 5 "variable_declaration" packages/shader-lab/src/parser/TargetParser.y
# Let's also check for any related productions and rules
rg "statement|declaration" packages/shader-lab/src/parser/TargetParser.y
# Check if there are any error productions or conflict resolution directives
rg "%prec|%left|%right|%nonassoc|error" packages/shader-lab/src/parser/TargetParser.y
Length of output: 2369
packages/shader-lab/src/parser/builtin/functions.ts (2)
295-295: LGTM! Function signature matches GLSL spec.
The textureCubeLodEXT function is correctly defined with appropriate parameter types (GSamplerCube, VEC3, FLOAT) and return value (GVec4).
289-290: LGTM! Verify WebGL extension availability.
The texture2DLodEXT functions are correctly defined with appropriate parameter types and return values. These functions are typically part of the GL_EXT_shader_texture_lod extension.
✅ Verification successful
Extension dependency is properly handled
The texture2DLodEXT functions are correctly supported as the GL_EXT_shader_texture_lod extension is already enabled in both the shader-lab and core packages:
- packages/shader-lab/src/codeGen/GLES100.ts
- packages/core/src/shaderlib/ShaderFactory.ts
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Search for extension enabling code
rg -A 2 "GL_EXT_shader_texture_lod|WEBGL_shader_texture_lod"
Length of output: 519
packages/shader-lab/src/lalr/CFG.ts (2)
19-19: LGTM! Grammar rule updated for variable list support.
The change from variable_declaration to variable_declaration_statement aligns with the PR objective to support variable list declarations.
27-28: LGTM! Variable declaration rule properly decomposed.
The variable_declaration rule has been correctly simplified to handle basic declaration components, allowing it to be used within a variable list. The semicolon is appropriately moved to the statement level.
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Actionable comments posted: 1
🧹 Nitpick comments (3)
packages/shader-lab/src/parser/SemanticAnalyzer.ts (1)
28-28: Consider implications of broadening error type.The change from
GSError[]toError[]makes the error collection more generic, but might lose shader-specific error information. Consider using a union typeArray<GSError | Error>to maintain type safety while allowing flexibility.packages/shader-lab/src/parser/AST.ts (2)
237-253: Enhance error message for array validation.While the array validation is good, the error message could be more descriptive to help developers understand the limitations and alternatives.
- sa.error(arraySpecifier.location, "Array of array is not supported."); + sa.error(arraySpecifier.location, "Nested arrays (array of arrays) are not supported in ShaderLab. Consider using a single array with a larger size.");
1405-1422: Consider moving semicolon handling to the visitor.The semicolon appending in codeGen might be better handled in the visitor to maintain consistent statement termination across all AST nodes.
- return visitor.visitVariableDeclaration(this) + ";"; + return visitor.visitVariableDeclaration(this);Then handle the semicolon in the visitor:
visitVariableDeclaration(node: VariableDeclaration): string { return this.generateVariableDeclaration(node) + ";"; }
📜 Review details
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Review profile: CHILL
Plan: Pro
⛔ Files ignored due to path filters (1)
tests/src/shader-lab/shaders/demo.shaderis excluded by!**/*.shader
📒 Files selected for processing (3)
packages/shader-lab/src/common/BaseScanner.ts(1 hunks)packages/shader-lab/src/parser/AST.ts(6 hunks)packages/shader-lab/src/parser/SemanticAnalyzer.ts(3 hunks)
🧰 Additional context used
🪛 Biome (1.9.4)
packages/shader-lab/src/parser/SemanticAnalyzer.ts
[error] 74-74: This code is unreachable
... because this statement will return from the function beforehand
(lint/correctness/noUnreachable)
🔇 Additional comments (2)
packages/shader-lab/src/parser/SemanticAnalyzer.ts (1)
68-76:
Fix unreachable code in error handling.
The current implementation has unreachable code in non-verbose mode due to the conditional compilation structure.
Apply this diff to fix the issue:
error(loc: ShaderRange, message: string) {
// #if _VERBOSE
const err = new GSError(GSErrorName.CompilationError, message, loc, ShaderLab._processingPassText);
this.errors.push(err);
return err;
// #else
- Logger.error(message);
+ const err = new Error(message);
+ Logger.error(message);
+ return err;
// #endif
}Likely invalid or redundant comment.
🧰 Tools
🪛 Biome (1.9.4)
[error] 74-74: This code is unreachable
... because this statement will return from the function beforehand
(lint/correctness/noUnreachable)
packages/shader-lab/src/common/BaseScanner.ts (1)
120-120: LGTM! Improved safety in comment parsing.
The addition of !this.isEnd() check is a crucial safety improvement that prevents infinite loops when parsing comments at the end of the source string.
There was a problem hiding this comment.
Actionable comments posted: 0
🧹 Nitpick comments (2)
packages/shader-lab/src/parser/AST.ts (2)
1126-1127: Consider moving semicolon handling to the visitor.The semicolon is currently hardcoded in the
codeGenmethod. Consider moving this responsibility to theCodeGenVisitorfor better separation of concerns.- return visitor.visitGlobalVariableDeclaration(this) + ";"; + return visitor.visitGlobalVariableDeclaration(this);Then update the visitor to handle semicolons consistently.
Also applies to: 1139-1141
1143-1169: Well-structured implementation with good separation of concerns.The implementation nicely separates:
- Grammar rules (in TargetParser.y)
- AST node definitions (in AST.ts)
- Semantic analysis (in node classes)
- Code generation (via visitor pattern)
This makes the code maintainable and extensible.
Consider documenting the design decisions and validation rules in the README or developer documentation.
Also applies to: 75-86
🧰 Tools
🪛 GitHub Check: codecov/patch
[warning] 1163-1163: packages/shader-lab/src/parser/AST.ts#L1163
Added line #L1163 was not covered by tests
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📒 Files selected for processing (6)
packages/shader-lab/src/common/BaseScanner.ts(1 hunks)packages/shader-lab/src/common/types.ts(1 hunks)packages/shader-lab/src/lalr/CFG.ts(1 hunks)packages/shader-lab/src/parser/AST.ts(3 hunks)packages/shader-lab/src/parser/GrammarSymbol.ts(1 hunks)packages/shader-lab/src/parser/TargetParser.y(1 hunks)
🚧 Files skipped from review as they are similar to previous changes (4)
- packages/shader-lab/src/common/types.ts
- packages/shader-lab/src/lalr/CFG.ts
- packages/shader-lab/src/parser/GrammarSymbol.ts
- packages/shader-lab/src/common/BaseScanner.ts
🧰 Additional context used
🪛 GitHub Check: codecov/patch
packages/shader-lab/src/parser/AST.ts
[warning] 200-201: packages/shader-lab/src/parser/AST.ts#L200-L201
Added lines #L200 - L201 were not covered by tests
[warning] 1163-1163: packages/shader-lab/src/parser/AST.ts#L1163
Added line #L1163 was not covered by tests
🔇 Additional comments (4)
packages/shader-lab/src/parser/TargetParser.y (1)
69-69: Grammar changes look good but need test coverage.
The grammar changes correctly implement variable list declarations with the following structure:
- Modified
global_declarationto usevariable_declaration_statement - Added support for comma-separated declarations via
variable_declaration_list - Properly handles array specifiers
- Enforces semicolon termination
The implementation follows common shader language conventions, similar to GLSL.
Please ensure comprehensive test coverage for:
- Basic variable list declarations
- Array declarations in lists
- Error cases (e.g., mismatched types)
Also applies to: 75-76, 79-83, 85-86
✅ Verification successful
Let me check the test coverage in the identified files.
Let me try a different approach to check the test coverage.
Let me check the actual shader test files to see if they cover variable declarations.
Test coverage exists for variable declaration list syntax
Based on the analysis of the test files, particularly demo.shader, there is test coverage for the new variable declaration list syntax. The file includes:
- Basic variable list declarations:
vec2 v1, v2[2], v3[3];- Array declarations in lists with initialization:
vec2 weights[2], offsets[2];- Error cases are covered in
compilation-error.shaderwhich tests the parser's error handling capabilities.
The test files demonstrate that the grammar changes for variable declarations are being exercised through the existing test suite, including:
- Comma-separated declarations
- Array specifiers
- Semicolon termination
- Various variable types and contexts
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Search for existing test files
fd -e test.ts -e spec.ts . | grep -i "shader\|variable\|declaration"
Length of output: 181
Script:
#!/bin/bash
# Check test content for variable declaration tests
echo "=== Checking Shader.test.ts ==="
rg -A 5 "variable.*declaration|test.*variable" tests/src/core/Shader.test.ts
echo -e "\n=== Checking Preprocessor.test.ts ==="
rg -A 5 "variable.*declaration|test.*variable" tests/src/shader-lab/Preprocessor.test.ts
echo -e "\n=== Checking ShaderLab.test.ts ==="
rg -A 5 "variable.*declaration|test.*variable" tests/src/shader-lab/ShaderLab.test.ts
# Look for parser test files that might have been missed
echo -e "\n=== Checking for parser test files ==="
fd -e test.ts -e spec.ts . | grep -i "parser"
Length of output: 645
Script:
#!/bin/bash
# Search for test files specifically in shader-lab package
echo "=== Checking for parser tests in shader-lab ==="
fd -e test.ts -e spec.ts . packages/shader-lab/
# Check content of ShaderLab.test.ts for any parser-related tests
echo -e "\n=== Content of ShaderLab.test.ts ==="
cat tests/src/shader-lab/ShaderLab.test.ts
# Look for test files containing "parser" in their content
echo -e "\n=== Files containing parser tests ==="
rg -l "describe.*['\"]Parser|test.*['\"]Parser" -g "*.test.ts" -g "*.spec.ts"
Length of output: 10107
Script:
#!/bin/bash
# Check the content of test shader files for variable declarations
echo "=== Checking test shader files ==="
# First, find the shader files
fd -e shader . tests/src/shader-lab/shaders/
# Then check content of a few key shader files that might contain variable declarations
echo -e "\n=== Content of demo.shader ==="
cat tests/src/shader-lab/shaders/demo.shader
echo -e "\n=== Content of compilation-error.shader ==="
cat tests/src/shader-lab/shaders/compilation-error.shader
Length of output: 8260
packages/shader-lab/src/parser/AST.ts (3)
181-187: LGTM: SingleDeclaration changes handle array specifiers correctly.
The changes properly track and handle array specifiers in the type system.
199-201: Add test coverage for array validation.
The array validation logic is important but lacks test coverage according to static analysis.
Please add tests for the array validation logic, particularly the "Array of array is not supported" error case.
🧰 Tools
🪛 GitHub Check: codecov/patch
[warning] 200-201: packages/shader-lab/src/parser/AST.ts#L200-L201
Added lines #L200 - L201 were not covered by tests
1143-1169: Add type validation and improve test coverage.
The VariableDeclarationList implementation looks good but could be improved:
- Missing test coverage for variable list creation (line 1163)
- No type compatibility validation between variables in the list
Run the following to check existing test coverage:
#!/bin/bash
# Search for relevant test cases
rg -A 5 "VariableDeclarationList" . --type ts --type test🧰 Tools
🪛 GitHub Check: codecov/patch
[warning] 1163-1163: packages/shader-lab/src/parser/AST.ts#L1163
Added line #L1163 was not covered by tests
Please check if the PR fulfills these requirements
What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
Summary by CodeRabbit
New Features
SEMICOLONfor enhanced parsing.texture2DLodEXTandtextureCubeLodEXTfor advanced texture sampling.Bug Fixes
Refactor