Add parser for YAML configurations
diff --git a/pkg/config/config.go b/pkg/config/config.go
new file mode 100644
index 0000000..a72ba9b
--- /dev/null
+++ b/pkg/config/config.go
@@ -0,0 +1,107 @@
+package config
+
+import (
+ "fmt"
+ "os"
+
+ "github.com/KorAP/KoralPipe-TermMapper2/pkg/ast"
+ "github.com/KorAP/KoralPipe-TermMapper2/pkg/parser"
+ "gopkg.in/yaml.v3"
+)
+
+// MappingRule represents a single mapping rule in the configuration
+type MappingRule string
+
+// MappingList represents a list of mapping rules with metadata
+type MappingList struct {
+ ID string `yaml:"id"`
+ FoundryA string `yaml:"foundryA,omitempty"`
+ LayerA string `yaml:"layerA,omitempty"`
+ FoundryB string `yaml:"foundryB,omitempty"`
+ LayerB string `yaml:"layerB,omitempty"`
+ Mappings []MappingRule `yaml:"mappings"`
+}
+
+// Config represents the root configuration containing multiple mapping lists
+type Config struct {
+ Lists []MappingList
+}
+
+// LoadConfig loads a YAML configuration file and returns a Config object
+func LoadConfig(filename string) (*Config, error) {
+ data, err := os.ReadFile(filename)
+ if err != nil {
+ return nil, fmt.Errorf("failed to read config file: %w", err)
+ }
+
+ var lists []MappingList
+ if err := yaml.Unmarshal(data, &lists); err != nil {
+ return nil, fmt.Errorf("failed to parse YAML: %w", err)
+ }
+
+ // Validate the configuration
+ for i, list := range lists {
+ if list.ID == "" {
+ return nil, fmt.Errorf("mapping list at index %d is missing an ID", i)
+ }
+ if len(list.Mappings) == 0 {
+ return nil, fmt.Errorf("mapping list '%s' has no mapping rules", list.ID)
+ }
+
+ // Validate each mapping rule
+ for j, rule := range list.Mappings {
+ if rule == "" {
+ return nil, fmt.Errorf("mapping list '%s' rule at index %d is empty", list.ID, j)
+ }
+ }
+ }
+
+ return &Config{Lists: lists}, nil
+}
+
+// ParseMappings parses all mapping rules in a list and returns a slice of parsed rules
+func (list *MappingList) ParseMappings() ([]*parser.MappingResult, error) {
+ // Create a grammar parser with the list's default foundries and layers
+ grammarParser, err := parser.NewGrammarParser("", "")
+ if err != nil {
+ return nil, fmt.Errorf("failed to create grammar parser: %w", err)
+ }
+
+ results := make([]*parser.MappingResult, len(list.Mappings))
+ for i, rule := range list.Mappings {
+ // Parse the mapping rule
+ result, err := grammarParser.ParseMapping(string(rule))
+ if err != nil {
+ return nil, fmt.Errorf("failed to parse mapping rule %d in list '%s': %w", i, list.ID, err)
+ }
+
+ // Apply default foundries and layers if not specified in the rule
+ if list.FoundryA != "" {
+ applyDefaultFoundryAndLayer(result.Upper.Wrap, list.FoundryA, list.LayerA)
+ }
+ if list.FoundryB != "" {
+ applyDefaultFoundryAndLayer(result.Lower.Wrap, list.FoundryB, list.LayerB)
+ }
+
+ results[i] = result
+ }
+
+ return results, nil
+}
+
+// applyDefaultFoundryAndLayer recursively applies default foundry and layer to terms that don't have them specified
+func applyDefaultFoundryAndLayer(node ast.Node, defaultFoundry, defaultLayer string) {
+ switch n := node.(type) {
+ case *ast.Term:
+ if n.Foundry == "" {
+ n.Foundry = defaultFoundry
+ }
+ if n.Layer == "" {
+ n.Layer = defaultLayer
+ }
+ case *ast.TermGroup:
+ for _, op := range n.Operands {
+ applyDefaultFoundryAndLayer(op, defaultFoundry, defaultLayer)
+ }
+ }
+}