sklears_compose/workflow_language/
code_generation.rs

1//! Code Generation for Workflows
2//!
3//! This module provides code generation capabilities for converting workflow definitions
4//! into executable code in various programming languages including Rust, Python, and JSON.
5//! Supports different code styles, optimization levels, and deployment targets.
6
7use serde::{Deserialize, Serialize};
8use sklears_core::error::{Result as SklResult, SklearsError};
9use std::collections::{BTreeMap, HashMap};
10
11use super::workflow_definitions::{ExecutionMode, StepDefinition, WorkflowDefinition};
12
13/// Code generation target language
14#[derive(Debug, Clone, Serialize, Deserialize)]
15pub enum CodeLanguage {
16    /// Rust language
17    Rust,
18    /// Python language
19    Python,
20    /// JSON format
21    Json,
22    /// YAML format
23    Yaml,
24    /// JavaScript/TypeScript
25    JavaScript,
26    /// C++ language
27    Cpp,
28}
29
30/// File format for saving/loading workflows
31#[derive(Debug, Clone, Serialize, Deserialize)]
32pub enum FileFormat {
33    /// Json
34    Json,
35    /// Yaml
36    Yaml,
37    /// Toml
38    Toml,
39    /// Binary
40    Binary,
41}
42
43/// Code generation configuration
44#[derive(Debug, Clone)]
45pub struct CodeGenerationConfig {
46    /// Target language
47    pub language: CodeLanguage,
48    /// Code style preferences
49    pub style: CodeStyle,
50    /// Optimization level
51    pub optimization_level: OptimizationLevel,
52    /// Include comments
53    pub include_comments: bool,
54    /// Include type annotations
55    pub include_type_annotations: bool,
56    /// Target deployment environment
57    pub deployment_target: DeploymentTarget,
58    /// Custom templates
59    pub custom_templates: HashMap<String, String>,
60}
61
62/// Code style preferences
63#[derive(Debug, Clone)]
64pub struct CodeStyle {
65    /// Indentation size
66    pub indent_size: usize,
67    /// Use tabs instead of spaces
68    pub use_tabs: bool,
69    /// Maximum line length
70    pub max_line_length: usize,
71    /// Naming convention
72    pub naming_convention: NamingConvention,
73    /// Include error handling
74    pub include_error_handling: bool,
75}
76
77/// Naming conventions
78#[derive(Debug, Clone)]
79pub enum NamingConvention {
80    /// `snake_case`
81    SnakeCase,
82    CamelCase,
83    /// `PascalCase`
84    PascalCase,
85    /// kebab-case
86    KebabCase,
87}
88
89/// Optimization levels
90#[derive(Debug, Clone)]
91pub enum OptimizationLevel {
92    /// No optimization, readable code
93    None,
94    /// Basic optimizations
95    Basic,
96    /// Aggressive optimizations
97    Aggressive,
98    /// Production-ready optimizations
99    Production,
100}
101
102/// Deployment targets
103#[derive(Debug, Clone)]
104pub enum DeploymentTarget {
105    /// Local development
106    Local,
107    /// Docker container
108    Docker,
109    /// Kubernetes
110    Kubernetes,
111    /// Cloud functions
112    CloudFunction,
113    /// WebAssembly
114    WebAssembly,
115    /// Embedded systems
116    Embedded,
117}
118
119/// Code generator for workflows
120#[derive(Debug)]
121pub struct CodeGenerator {
122    /// Generation configuration
123    config: CodeGenerationConfig,
124    /// Template engine
125    templates: TemplateEngine,
126    /// Generated code statistics
127    stats: GenerationStatistics,
128}
129
130/// Template engine for code generation
131#[derive(Debug)]
132pub struct TemplateEngine {
133    /// Language templates
134    templates: HashMap<CodeLanguage, LanguageTemplate>,
135    /// Custom template overrides
136    custom_overrides: HashMap<String, String>,
137}
138
139/// Language-specific templates
140#[derive(Debug, Clone)]
141pub struct LanguageTemplate {
142    /// File header template
143    pub header: String,
144    /// Import/use statements template
145    pub imports: String,
146    /// Function definition template
147    pub function_def: String,
148    /// Step execution template
149    pub step_execution: String,
150    /// Connection template
151    pub connection: String,
152    /// Footer template
153    pub footer: String,
154}
155
156/// Code generation statistics
157#[derive(Debug, Clone)]
158pub struct GenerationStatistics {
159    pub total_lines: usize,
160    pub code_lines: usize,
161    pub comment_lines: usize,
162    pub function_count: usize,
163    pub import_count: usize,
164    pub generation_time: std::time::Duration,
165}
166
167/// Generated code result
168#[derive(Debug, Clone)]
169pub struct GeneratedCode {
170    /// Generated source code
171    pub source_code: String,
172    /// Language of generated code
173    pub language: CodeLanguage,
174    /// Required dependencies
175    pub dependencies: Vec<String>,
176    /// Compilation/execution instructions
177    pub instructions: String,
178    /// Generation statistics
179    pub statistics: GenerationStatistics,
180}
181
182impl CodeGenerator {
183    /// Create a new code generator
184    #[must_use]
185    pub fn new(config: CodeGenerationConfig) -> Self {
186        Self {
187            config,
188            templates: TemplateEngine::new(),
189            stats: GenerationStatistics::new(),
190        }
191    }
192
193    /// Get the code generation language
194    #[must_use]
195    pub fn language(&self) -> &CodeLanguage {
196        &self.config.language
197    }
198
199    /// Check if comments are included
200    #[must_use]
201    pub fn include_comments(&self) -> bool {
202        self.config.include_comments
203    }
204
205    /// Generate code from workflow definition
206    pub fn generate_code(&mut self, workflow: &WorkflowDefinition) -> SklResult<GeneratedCode> {
207        let generation_start = std::time::Instant::now();
208
209        let source_code = match self.config.language {
210            CodeLanguage::Rust => self.generate_rust_code(workflow)?,
211            CodeLanguage::Python => self.generate_python_code(workflow)?,
212            CodeLanguage::Json => self.generate_json_code(workflow)?,
213            CodeLanguage::Yaml => self.generate_yaml_code(workflow)?,
214            CodeLanguage::JavaScript => self.generate_javascript_code(workflow)?,
215            CodeLanguage::Cpp => self.generate_cpp_code(workflow)?,
216        };
217
218        self.stats.generation_time = generation_start.elapsed();
219        self.update_statistics(&source_code);
220
221        Ok(GeneratedCode {
222            source_code,
223            language: self.config.language.clone(),
224            dependencies: self.get_required_dependencies(workflow),
225            instructions: self.generate_instructions(),
226            statistics: self.stats.clone(),
227        })
228    }
229
230    /// Generate Rust code
231    fn generate_rust_code(&self, workflow: &WorkflowDefinition) -> SklResult<String> {
232        let mut code = String::new();
233
234        // Header and imports
235        code.push_str(&self.generate_rust_header(workflow));
236        code.push_str(&self.generate_rust_imports(workflow));
237
238        // Main function
239        code.push_str(&self.generate_rust_main_function(workflow));
240
241        // Step functions
242        for step in &workflow.steps {
243            code.push_str(&self.generate_rust_step_function(step, workflow)?);
244        }
245
246        Ok(code)
247    }
248
249    /// Generate Rust header
250    fn generate_rust_header(&self, workflow: &WorkflowDefinition) -> String {
251        let mut header = String::new();
252
253        if self.config.include_comments {
254            header.push_str(&format!(
255                "//! Generated Rust code for workflow: {}\n",
256                workflow.metadata.name
257            ));
258            header.push_str(&format!("//! Version: {}\n", workflow.metadata.version));
259            if let Some(description) = &workflow.metadata.description {
260                header.push_str(&format!("//! Description: {description}\n"));
261            }
262            header.push_str("//!\n");
263            header.push_str(
264                "//! This code was automatically generated from a workflow definition.\n",
265            );
266            header.push_str("//! Do not edit this file directly.\n\n");
267        }
268
269        header
270    }
271
272    /// Generate Rust imports
273    fn generate_rust_imports(&self, _workflow: &WorkflowDefinition) -> String {
274        let mut imports = String::new();
275
276        imports.push_str("use sklears_core::{\n");
277        imports.push_str("    error::{Result as SklResult, SklearsError},\n");
278        imports.push_str("    types::Float,\n");
279        imports.push_str("};\n");
280        imports.push_str("use scirs2_core::ndarray::{Array1, Array2};\n");
281        imports.push_str("use std::collections::HashMap;\n");
282        imports.push_str("use serde::{Serialize, Deserialize};\n\n");
283
284        imports
285    }
286
287    /// Generate Rust main function
288    fn generate_rust_main_function(&self, workflow: &WorkflowDefinition) -> String {
289        let function_name = self.convert_name(
290            &workflow.metadata.name,
291            &self.config.style.naming_convention,
292        );
293        let mut code = String::new();
294
295        if self.config.include_comments {
296            code.push_str(&format!(
297                "/// Execute the {} workflow\n",
298                workflow.metadata.name
299            ));
300        }
301
302        code.push_str(&format!(
303            "pub fn {function_name}() -> SklResult<HashMap<String, Array2<Float>>> {{\n"
304        ));
305
306        // Execution mode setup
307        match workflow.execution.mode {
308            ExecutionMode::Parallel => {
309                code.push_str("    // Parallel execution mode\n");
310            }
311            ExecutionMode::Sequential => {
312                code.push_str("    // Sequential execution mode\n");
313            }
314            _ => {
315                code.push_str("    // Default execution mode\n");
316            }
317        }
318
319        code.push_str("    let mut results = HashMap::new();\n\n");
320
321        // Generate step calls in execution order
322        for step in &workflow.steps {
323            let step_func_name = self.convert_name(&step.id, &self.config.style.naming_convention);
324            code.push_str(&format!(
325                "    let {step_func_name} = {step_func_name}()?;\n"
326            ));
327        }
328
329        code.push_str("\n    Ok(results)\n");
330        code.push_str("}\n\n");
331
332        code
333    }
334
335    /// Generate Rust step function
336    fn generate_rust_step_function(
337        &self,
338        step: &StepDefinition,
339        _workflow: &WorkflowDefinition,
340    ) -> SklResult<String> {
341        let function_name = self.convert_name(&step.id, &self.config.style.naming_convention);
342        let mut code = String::new();
343
344        if self.config.include_comments {
345            code.push_str(&format!(
346                "/// Execute step: {} ({})\n",
347                step.id, step.algorithm
348            ));
349            if let Some(description) = &step.description {
350                code.push_str(&format!("/// {description}\n"));
351            }
352        }
353
354        code.push_str(&format!(
355            "fn {function_name}() -> SklResult<Array2<Float>> {{\n"
356        ));
357
358        // Algorithm-specific implementation
359        match step.algorithm.as_str() {
360            "StandardScaler" => {
361                code.push_str("    // StandardScaler implementation\n");
362                code.push_str("    // TODO: Implement actual scaling logic\n");
363                code.push_str("    let scaled_data = Array2::zeros((0, 0));\n");
364                code.push_str("    Ok(scaled_data)\n");
365            }
366            "LinearRegression" => {
367                code.push_str("    // LinearRegression implementation\n");
368                code.push_str("    // TODO: Implement actual regression logic\n");
369                code.push_str("    let predictions = Array2::zeros((0, 0));\n");
370                code.push_str("    Ok(predictions)\n");
371            }
372            _ => {
373                code.push_str(&format!("    // {} implementation\n", step.algorithm));
374                code.push_str("    // TODO: Implement component logic\n");
375                code.push_str("    let result = Array2::zeros((0, 0));\n");
376                code.push_str("    Ok(result)\n");
377            }
378        }
379
380        code.push_str("}\n\n");
381
382        Ok(code)
383    }
384
385    /// Generate Python code
386    fn generate_python_code(&self, workflow: &WorkflowDefinition) -> SklResult<String> {
387        let mut code = String::new();
388
389        // Header and imports
390        code.push_str(&self.generate_python_header(workflow));
391        code.push_str(&self.generate_python_imports());
392
393        // Main function
394        code.push_str(&self.generate_python_main_function(workflow));
395
396        // Step functions
397        for step in &workflow.steps {
398            code.push_str(&self.generate_python_step_function(step)?);
399        }
400
401        Ok(code)
402    }
403
404    /// Generate Python header
405    fn generate_python_header(&self, workflow: &WorkflowDefinition) -> String {
406        let mut header = String::new();
407
408        if self.config.include_comments {
409            header.push_str(&format!(
410                "\"\"\"Generated Python code for workflow: {}\n",
411                workflow.metadata.name
412            ));
413            header.push_str(&format!("Version: {}\n", workflow.metadata.version));
414            if let Some(description) = &workflow.metadata.description {
415                header.push_str(&format!("Description: {description}\n"));
416            }
417            header
418                .push_str("\nThis code was automatically generated from a workflow definition.\n");
419            header.push_str("Do not edit this file directly.\n");
420            header.push_str("\"\"\"\n\n");
421        }
422
423        header
424    }
425
426    /// Generate Python imports
427    fn generate_python_imports(&self) -> String {
428        let mut imports = String::new();
429
430        imports.push_str("import numpy as np\n");
431        imports.push_str("from sklearn.preprocessing import StandardScaler\n");
432        imports.push_str("from sklearn.linear_model import LinearRegression\n");
433        imports.push_str("from typing import Dict, Any, Optional\n\n");
434
435        imports
436    }
437
438    /// Generate Python main function
439    fn generate_python_main_function(&self, workflow: &WorkflowDefinition) -> String {
440        let function_name =
441            self.convert_name(&workflow.metadata.name, &NamingConvention::SnakeCase);
442        let mut code = String::new();
443
444        if self.config.include_comments {
445            code.push_str(&format!("def {function_name}() -> Dict[str, Any]:\n"));
446            code.push_str(&format!(
447                "    \"\"\"Execute the {} workflow.\"\"\"\n",
448                workflow.metadata.name
449            ));
450        } else {
451            code.push_str(&format!("def {function_name}():\n"));
452        }
453
454        code.push_str("    results = {}\n\n");
455
456        // Generate step calls
457        for step in &workflow.steps {
458            let step_func_name = self.convert_name(&step.id, &NamingConvention::SnakeCase);
459            code.push_str(&format!(
460                "    results['{}'] = {}()\n",
461                step.id, step_func_name
462            ));
463        }
464
465        code.push_str("\n    return results\n\n");
466
467        code
468    }
469
470    /// Generate Python step function
471    fn generate_python_step_function(&self, step: &StepDefinition) -> SklResult<String> {
472        let function_name = self.convert_name(&step.id, &NamingConvention::SnakeCase);
473        let mut code = String::new();
474
475        if self.config.include_comments {
476            code.push_str(&format!("def {function_name}():\n"));
477            code.push_str(&format!(
478                "    \"\"\"Execute step: {} ({}).\"\"\"\n",
479                step.id, step.algorithm
480            ));
481        } else {
482            code.push_str(&format!("def {function_name}():\n"));
483        }
484
485        // Algorithm-specific implementation
486        match step.algorithm.as_str() {
487            "StandardScaler" => {
488                code.push_str("    scaler = StandardScaler()\n");
489                code.push_str("    # TODO: Implement actual scaling logic\n");
490                code.push_str("    return scaler\n");
491            }
492            "LinearRegression" => {
493                code.push_str("    model = LinearRegression()\n");
494                code.push_str("    # TODO: Implement actual training logic\n");
495                code.push_str("    return model\n");
496            }
497            _ => {
498                code.push_str(&format!("    # {} implementation\n", step.algorithm));
499                code.push_str("    # TODO: Implement component logic\n");
500                code.push_str("    return None\n");
501            }
502        }
503
504        code.push('\n');
505
506        Ok(code)
507    }
508
509    /// Generate JSON code
510    fn generate_json_code(&self, workflow: &WorkflowDefinition) -> SklResult<String> {
511        match serde_json::to_string_pretty(workflow) {
512            Ok(json) => Ok(json),
513            Err(e) => Err(SklearsError::InvalidInput(format!(
514                "JSON serialization failed: {e}"
515            ))),
516        }
517    }
518
519    /// Generate YAML code
520    fn generate_yaml_code(&self, workflow: &WorkflowDefinition) -> SklResult<String> {
521        match serde_yaml::to_string(workflow) {
522            Ok(yaml) => Ok(yaml),
523            Err(e) => Err(SklearsError::InvalidInput(format!(
524                "YAML serialization failed: {e}"
525            ))),
526        }
527    }
528
529    /// Generate JavaScript code
530    fn generate_javascript_code(&self, workflow: &WorkflowDefinition) -> SklResult<String> {
531        let mut code = String::new();
532
533        code.push_str(&format!(
534            "// Generated JavaScript code for workflow: {}\n\n",
535            workflow.metadata.name
536        ));
537
538        code.push_str(&format!(
539            "function {}() {{\n",
540            self.convert_name(&workflow.metadata.name, &NamingConvention::CamelCase)
541        ));
542
543        code.push_str("    const results = {};\n\n");
544
545        for step in &workflow.steps {
546            code.push_str(&format!(
547                "    results['{}'] = {}();\n",
548                step.id,
549                self.convert_name(&step.id, &NamingConvention::CamelCase)
550            ));
551        }
552
553        code.push_str("\n    return results;\n");
554        code.push_str("}\n\n");
555
556        // Step functions
557        for step in &workflow.steps {
558            code.push_str(&format!(
559                "function {}() {{\n",
560                self.convert_name(&step.id, &NamingConvention::CamelCase)
561            ));
562            code.push_str(&format!("    // {} implementation\n", step.algorithm));
563            code.push_str("    // TODO: Implement component logic\n");
564            code.push_str("    return null;\n");
565            code.push_str("}\n\n");
566        }
567
568        Ok(code)
569    }
570
571    /// Generate C++ code
572    fn generate_cpp_code(&self, workflow: &WorkflowDefinition) -> SklResult<String> {
573        let mut code = String::new();
574
575        // Header
576        code.push_str(&format!(
577            "// Generated C++ code for workflow: {}\n\n",
578            workflow.metadata.name
579        ));
580
581        // Includes
582        code.push_str("#include <iostream>\n");
583        code.push_str("#include <vector>\n");
584        code.push_str("#include <map>\n");
585        code.push_str("#include <string>\n\n");
586
587        // Main function
588        code.push_str(&format!(
589            "std::map<std::string, void*> {}() {{\n",
590            self.convert_name(&workflow.metadata.name, &NamingConvention::SnakeCase)
591        ));
592
593        code.push_str("    std::map<std::string, void*> results;\n\n");
594
595        for step in &workflow.steps {
596            code.push_str(&format!(
597                "    results[\"{}\"] = {}();\n",
598                step.id,
599                self.convert_name(&step.id, &NamingConvention::SnakeCase)
600            ));
601        }
602
603        code.push_str("\n    return results;\n");
604        code.push_str("}\n\n");
605
606        // Step functions
607        for step in &workflow.steps {
608            code.push_str(&format!(
609                "void* {}() {{\n",
610                self.convert_name(&step.id, &NamingConvention::SnakeCase)
611            ));
612            code.push_str(&format!("    // {} implementation\n", step.algorithm));
613            code.push_str("    // TODO: Implement component logic\n");
614            code.push_str("    return nullptr;\n");
615            code.push_str("}\n\n");
616        }
617
618        Ok(code)
619    }
620
621    /// Convert name according to naming convention
622    #[must_use]
623    pub fn convert_name(&self, name: &str, convention: &NamingConvention) -> String {
624        match convention {
625            NamingConvention::SnakeCase => name
626                .split(|c: char| c.is_whitespace() || c == '-' || c == '_')
627                .filter(|segment| !segment.is_empty())
628                .map(|segment| segment.to_lowercase())
629                .collect::<Vec<_>>()
630                .join("_"),
631            NamingConvention::CamelCase => {
632                let mut result = String::new();
633                let mut capitalize_next = false;
634                for (i, c) in name.chars().enumerate() {
635                    if c.is_whitespace() || c == '_' || c == '-' {
636                        capitalize_next = true;
637                    } else if i == 0 {
638                        result.push(c.to_lowercase().next().unwrap());
639                    } else if capitalize_next {
640                        result.push(c.to_uppercase().next().unwrap());
641                        capitalize_next = false;
642                    } else {
643                        result.push(c.to_lowercase().next().unwrap());
644                    }
645                }
646                result
647            }
648            NamingConvention::PascalCase => {
649                let mut result = String::new();
650                let mut capitalize_next = true;
651                for c in name.chars() {
652                    if c.is_whitespace() || c == '_' || c == '-' {
653                        capitalize_next = true;
654                    } else if capitalize_next {
655                        result.push(c.to_uppercase().next().unwrap());
656                        capitalize_next = false;
657                    } else {
658                        result.push(c.to_lowercase().next().unwrap());
659                    }
660                }
661                result
662            }
663            NamingConvention::KebabCase => name
664                .to_lowercase()
665                .chars()
666                .map(|c| {
667                    if c.is_whitespace() || c == '_' {
668                        '-'
669                    } else {
670                        c
671                    }
672                })
673                .collect::<String>()
674                .replace("--", "-"),
675        }
676    }
677
678    /// Get required dependencies for workflow
679    fn get_required_dependencies(&self, workflow: &WorkflowDefinition) -> Vec<String> {
680        let mut dependencies = Vec::new();
681
682        match self.config.language {
683            CodeLanguage::Rust => {
684                dependencies.push("sklears-core".to_string());
685                dependencies.push("scirs2-autograd".to_string());
686                dependencies.push("serde".to_string());
687            }
688            CodeLanguage::Python => {
689                dependencies.push("numpy".to_string());
690                dependencies.push("scikit-learn".to_string());
691            }
692            _ => {}
693        }
694
695        // Add algorithm-specific dependencies
696        for step in &workflow.steps {
697            match step.algorithm.as_str() {
698                "StandardScaler" | "LinearRegression" => {
699                    if matches!(self.config.language, CodeLanguage::Python)
700                        && !dependencies.contains(&"scikit-learn".to_string())
701                    {
702                        dependencies.push("scikit-learn".to_string());
703                    }
704                }
705                _ => {}
706            }
707        }
708
709        dependencies
710    }
711
712    /// Generate compilation/execution instructions
713    fn generate_instructions(&self) -> String {
714        match self.config.language {
715            CodeLanguage::Rust => "To compile and run:\n\
716                1. Add dependencies to Cargo.toml\n\
717                2. Run 'cargo build'\n\
718                3. Run 'cargo run'"
719                .to_string(),
720            CodeLanguage::Python => "To run:\n\
721                1. Install dependencies: pip install numpy scikit-learn\n\
722                2. Run: python workflow.py"
723                .to_string(),
724            CodeLanguage::JavaScript => "To run:\n\
725                1. Install Node.js\n\
726                2. Run: node workflow.js"
727                .to_string(),
728            CodeLanguage::Cpp => "To compile and run:\n\
729                1. Compile: g++ -o workflow workflow.cpp\n\
730                2. Run: ./workflow"
731                .to_string(),
732            _ => "See language-specific documentation".to_string(),
733        }
734    }
735
736    /// Update generation statistics
737    fn update_statistics(&mut self, source_code: &str) {
738        let lines: Vec<&str> = source_code.lines().collect();
739        self.stats.total_lines = lines.len();
740
741        self.stats.code_lines = lines
742            .iter()
743            .filter(|line| {
744                !line.trim().is_empty()
745                    && !line.trim().starts_with("//")
746                    && !line.trim().starts_with('#')
747            })
748            .count();
749
750        self.stats.comment_lines = lines
751            .iter()
752            .filter(|line| line.trim().starts_with("//") || line.trim().starts_with('#'))
753            .count();
754
755        // Count functions (approximate)
756        self.stats.function_count = source_code.matches("fn ").count()
757            + source_code.matches("def ").count()
758            + source_code.matches("function ").count();
759
760        // Count imports (approximate)
761        self.stats.import_count = source_code.matches("use ").count()
762            + source_code.matches("import ").count()
763            + source_code.matches("#include").count();
764    }
765}
766
767impl TemplateEngine {
768    fn new() -> Self {
769        Self {
770            templates: HashMap::new(),
771            custom_overrides: HashMap::new(),
772        }
773    }
774}
775
776impl GenerationStatistics {
777    fn new() -> Self {
778        Self {
779            total_lines: 0,
780            code_lines: 0,
781            comment_lines: 0,
782            function_count: 0,
783            import_count: 0,
784            generation_time: std::time::Duration::from_secs(0),
785        }
786    }
787}
788
789impl Default for CodeGenerationConfig {
790    fn default() -> Self {
791        Self {
792            language: CodeLanguage::Rust,
793            style: CodeStyle::default(),
794            optimization_level: OptimizationLevel::Basic,
795            include_comments: true,
796            include_type_annotations: true,
797            deployment_target: DeploymentTarget::Local,
798            custom_templates: HashMap::new(),
799        }
800    }
801}
802
803impl Default for CodeStyle {
804    fn default() -> Self {
805        Self {
806            indent_size: 4,
807            use_tabs: false,
808            max_line_length: 100,
809            naming_convention: NamingConvention::SnakeCase,
810            include_error_handling: true,
811        }
812    }
813}
814
815/// Code generation error types
816#[derive(Debug, Clone, thiserror::Error)]
817pub enum CodeGenerationError {
818    /// Template compilation error
819    #[error("Template compilation error: {0}")]
820    TemplateError(String),
821    /// Language backend error
822    #[error("Language backend error: {0}")]
823    LanguageError(String),
824    /// Configuration error
825    #[error("Configuration error: {0}")]
826    ConfigError(String),
827    /// Workflow validation error
828    #[error("Workflow validation error: {0}")]
829    WorkflowError(String),
830    /// IO error
831    #[error("IO error: {0}")]
832    IoError(String),
833    /// Syntax error in generated code
834    #[error("Syntax error in generated code: {0}")]
835    SyntaxError(String),
836    /// Dependency resolution error
837    #[error("Dependency resolution error: {0}")]
838    DependencyError(String),
839    /// Sklears error
840    #[error("Sklears error: {0}")]
841    SklearsError(#[from] sklears_core::error::SklearsError),
842}
843
844/// Code template for code generation
845#[derive(Debug, Clone, Serialize, Deserialize)]
846pub struct CodeTemplate {
847    /// Template name
848    pub name: String,
849    /// Template content
850    pub content: String,
851    /// Template language
852    pub language: CodeLanguage,
853    /// Template variables
854    pub variables: Vec<String>,
855    /// Template metadata
856    pub metadata: TemplateMetadata,
857}
858
859/// Template metadata
860#[derive(Debug, Clone, Serialize, Deserialize)]
861pub struct TemplateMetadata {
862    /// Author of the template
863    pub author: Option<String>,
864    /// Template version
865    pub version: String,
866    /// Template description
867    pub description: Option<String>,
868    /// Template tags
869    pub tags: Vec<String>,
870}
871
872/// Language backend for code generation
873#[derive(Debug, Clone, Serialize, Deserialize)]
874pub struct LanguageBackend {
875    /// Language name
876    pub language: CodeLanguage,
877    /// Code generator
878    pub generator: String,
879    /// Template engine
880    pub template_engine: String,
881    /// Supported features
882    pub features: Vec<String>,
883    /// Backend configuration
884    pub config: BTreeMap<String, String>,
885}
886
887/// Type alias for target language (compatibility)
888pub type TargetLanguage = CodeLanguage;
889
890/// Template context for variable substitution
891#[derive(Debug, Clone, Serialize, Deserialize, Default)]
892pub struct TemplateContext {
893    /// Template variables
894    pub variables: BTreeMap<String, TemplateValue>,
895    /// Global constants
896    pub constants: BTreeMap<String, String>,
897    /// Include paths
898    pub include_paths: Vec<String>,
899    /// Conditional flags
900    pub flags: BTreeMap<String, bool>,
901}
902
903/// Template value types
904#[derive(Debug, Clone, Serialize, Deserialize)]
905pub enum TemplateValue {
906    /// String value
907    String(String),
908    /// Number value
909    Number(f64),
910    /// Boolean value
911    Boolean(bool),
912    /// Array value
913    Array(Vec<TemplateValue>),
914    /// Object value
915    Object(BTreeMap<String, TemplateValue>),
916}
917
918/// Template registry for managing templates
919#[derive(Debug, Clone, Serialize, Deserialize)]
920pub struct TemplateRegistry {
921    /// Registered templates
922    pub templates: BTreeMap<String, CodeTemplate>,
923    /// Template categories
924    pub categories: BTreeMap<String, Vec<String>>,
925    /// Registry metadata
926    pub metadata: RegistryMetadata,
927}
928
929/// Registry metadata
930#[derive(Debug, Clone, Serialize, Deserialize)]
931pub struct RegistryMetadata {
932    /// Registry name
933    pub name: String,
934    /// Registry version
935    pub version: String,
936    /// Last updated timestamp
937    pub updated_at: String,
938    /// Total template count
939    pub template_count: usize,
940}
941
942impl TemplateRegistry {
943    /// Create a new template registry
944    #[must_use]
945    pub fn new() -> Self {
946        Self {
947            templates: BTreeMap::new(),
948            categories: BTreeMap::new(),
949            metadata: RegistryMetadata {
950                name: "Default Registry".to_string(),
951                version: "1.0.0".to_string(),
952                updated_at: chrono::Utc::now().to_rfc3339(),
953                template_count: 0,
954            },
955        }
956    }
957
958    /// Register a new template
959    pub fn register_template(&mut self, template: CodeTemplate) {
960        self.templates.insert(template.name.clone(), template);
961        self.metadata.template_count = self.templates.len();
962        self.metadata.updated_at = chrono::Utc::now().to_rfc3339();
963    }
964
965    /// Get a template by name
966    #[must_use]
967    pub fn get_template(&self, name: &str) -> Option<&CodeTemplate> {
968        self.templates.get(name)
969    }
970}
971
972impl Default for TemplateRegistry {
973    fn default() -> Self {
974        Self::new()
975    }
976}
977
978#[allow(non_snake_case)]
979#[cfg(test)]
980mod tests {
981    use super::*;
982    use crate::workflow_language::workflow_definitions::{StepType, WorkflowMetadata};
983
984    #[test]
985    fn test_code_generator_creation() {
986        let config = CodeGenerationConfig::default();
987        let generator = CodeGenerator::new(config);
988        assert_eq!(generator.stats.total_lines, 0);
989    }
990
991    #[test]
992    fn test_rust_code_generation() {
993        let mut generator = CodeGenerator::new(CodeGenerationConfig::default());
994        let mut workflow = WorkflowDefinition::default();
995        workflow.metadata.name = "test_workflow".to_string();
996        workflow.steps.push(StepDefinition::new(
997            "step1",
998            StepType::Transformer,
999            "StandardScaler",
1000        ));
1001
1002        let result = generator.generate_code(&workflow);
1003        assert!(result.is_ok());
1004
1005        let generated = result.unwrap();
1006        assert!(!generated.source_code.is_empty());
1007        assert!(matches!(generated.language, CodeLanguage::Rust));
1008        assert!(!generated.dependencies.is_empty());
1009    }
1010
1011    #[test]
1012    fn test_python_code_generation() {
1013        let config = CodeGenerationConfig {
1014            language: CodeLanguage::Python,
1015            ..Default::default()
1016        };
1017        let mut generator = CodeGenerator::new(config);
1018        let mut workflow = WorkflowDefinition::default();
1019        workflow.metadata.name = "test_workflow".to_string();
1020        workflow.steps.push(StepDefinition::new(
1021            "step1",
1022            StepType::Transformer,
1023            "StandardScaler",
1024        ));
1025
1026        let result = generator.generate_code(&workflow);
1027        assert!(result.is_ok());
1028
1029        let generated = result.unwrap();
1030        assert!(!generated.source_code.is_empty());
1031        assert!(matches!(generated.language, CodeLanguage::Python));
1032        assert!(generated.source_code.contains("def "));
1033    }
1034
1035    #[test]
1036    fn test_json_code_generation() {
1037        let config = CodeGenerationConfig {
1038            language: CodeLanguage::Json,
1039            ..Default::default()
1040        };
1041        let mut generator = CodeGenerator::new(config);
1042        let workflow = WorkflowDefinition::default();
1043
1044        let result = generator.generate_code(&workflow);
1045        assert!(result.is_ok());
1046
1047        let generated = result.unwrap();
1048        assert!(!generated.source_code.is_empty());
1049        assert!(generated.source_code.contains("{"));
1050    }
1051
1052    #[test]
1053    fn test_naming_convention_conversion() {
1054        let config = CodeGenerationConfig::default();
1055        let generator = CodeGenerator::new(config);
1056
1057        assert_eq!(
1058            generator.convert_name("Test Workflow", &NamingConvention::SnakeCase),
1059            "test_workflow"
1060        );
1061        assert_eq!(
1062            generator.convert_name("test_workflow", &NamingConvention::CamelCase),
1063            "testWorkflow"
1064        );
1065        assert_eq!(
1066            generator.convert_name("test_workflow", &NamingConvention::PascalCase),
1067            "TestWorkflow"
1068        );
1069        assert_eq!(
1070            generator.convert_name("test_workflow", &NamingConvention::KebabCase),
1071            "test-workflow"
1072        );
1073    }
1074}
sklears_compose/workflow_language/code_generation.rs

sklears_compose/workflow_language/
code_generation.rs
