chore: import upstream snapshot with attribution

internal/parser/languages/solidity.go

@@ -0,0 +1,174 @@
+package languages
+
+import (
+	"regexp"
+	"strings"
+
+	"github.com/zzet/gortex/internal/graph"
+	"github.com/zzet/gortex/internal/parser"
+)
+
+// Solidity is the dominant smart-contract language for the EVM. Its
+// top-level constructs are `contract`, `library`, `interface`,
+// `abstract contract`; each holding functions, modifiers, events,
+// state variables, and struct / enum definitions. Imports resolve
+// to file paths (`./X.sol`) or named symbols
+// (`import {IERC20} from "./IERC20.sol"`).
+var (
+	solContractRe = regexp.MustCompile(`(?m)^\s*(abstract\s+contract|contract|library|interface)\s+(\w+)`)
+	solFuncRe     = regexp.MustCompile(`(?m)^\s*function\s+(\w+)\s*\(`)
+	solModifierRe = regexp.MustCompile(`(?m)^\s*modifier\s+(\w+)\s*\(?`)
+	solEventRe    = regexp.MustCompile(`(?m)^\s*event\s+(\w+)\s*\(`)
+	solStructRe   = regexp.MustCompile(`(?m)^\s*struct\s+(\w+)\s*\{`)
+	solEnumRe     = regexp.MustCompile(`(?m)^\s*enum\s+(\w+)\s*\{`)
+	solImportRe   = regexp.MustCompile(`(?m)^\s*import\s+(?:\{[^}]*\}\s+from\s+)?["']([^"']+)["']`)
+	solVarRe      = regexp.MustCompile(`(?m)^\s+(?:public|private|internal|external)?\s*(\w+(?:\[\])?)\s+(?:public\s+|private\s+|internal\s+|constant\s+|immutable\s+)*(\w+)\s*(?:=|;)`)
+	solCallRe     = regexp.MustCompile(`\b([A-Za-z_]\w*)\s*\(`)
+)
+
+// SolidityExtractor extracts Solidity source using regex.
+type SolidityExtractor struct{}
+
+func NewSolidityExtractor() *SolidityExtractor { return &SolidityExtractor{} }
+
+func (e *SolidityExtractor) Language() string     { return "solidity" }
+func (e *SolidityExtractor) Extensions() []string { return []string{".sol"} }
+
+func (e *SolidityExtractor) Extract(filePath string, src []byte) (*parser.ExtractionResult, error) {
+	lines := strings.Split(string(src), "\n")
+	result := &parser.ExtractionResult{}
+
+	fileNode := &graph.Node{
+		ID: filePath, Kind: graph.KindFile, Name: filePath,
+		FilePath: filePath, StartLine: 1, EndLine: len(lines),
+		Language: "solidity",
+	}
+	result.Nodes = append(result.Nodes, fileNode)
+
+	seen := make(map[string]bool)
+	add := func(name string, kind graph.NodeKind, start, end int, meta map[string]any) {
+		if name == "" || isSolidityKeyword(name) {
+			return
+		}
+		id := filePath + "::" + name
+		if seen[id] {
+			return
+		}
+		seen[id] = true
+		result.Nodes = append(result.Nodes, &graph.Node{
+			ID: id, Kind: kind, Name: name,
+			FilePath: filePath, StartLine: start, EndLine: end,
+			Language: "solidity",
+			Meta:     meta,
+		})
+		result.Edges = append(result.Edges, &graph.Edge{
+			From: fileNode.ID, To: id, Kind: graph.EdgeDefines,
+			FilePath: filePath, Line: start,
+		})
+	}
+
+	for _, m := range solContractRe.FindAllSubmatchIndex(src, -1) {
+		keyword := strings.TrimSpace(string(src[m[2]:m[3]]))
+		name := string(src[m[4]:m[5]])
+		line := lineAt(src, m[0])
+		end := findBlockEnd(lines, line)
+		kind := graph.KindType
+		if strings.Contains(keyword, "interface") {
+			kind = graph.KindInterface
+		}
+		add(name, kind, line, end, map[string]any{"sol_kind": keyword})
+	}
+
+	for _, m := range solFuncRe.FindAllSubmatchIndex(src, -1) {
+		name := string(src[m[2]:m[3]])
+		line := lineAt(src, m[0])
+		end := findBlockEnd(lines, line)
+		add(name, graph.KindMethod, line, end, nil)
+	}
+	for _, m := range solModifierRe.FindAllSubmatchIndex(src, -1) {
+		name := string(src[m[2]:m[3]])
+		line := lineAt(src, m[0])
+		end := findBlockEnd(lines, line)
+		add(name, graph.KindMethod, line, end, map[string]any{"sol_kind": "modifier"})
+	}
+	for _, m := range solEventRe.FindAllSubmatchIndex(src, -1) {
+		name := string(src[m[2]:m[3]])
+		line := lineAt(src, m[0])
+		add(name, graph.KindMethod, line, line, map[string]any{"sol_kind": "event"})
+	}
+	for _, m := range solStructRe.FindAllSubmatchIndex(src, -1) {
+		name := string(src[m[2]:m[3]])
+		line := lineAt(src, m[0])
+		end := findBlockEnd(lines, line)
+		add(name, graph.KindType, line, end, map[string]any{"sol_kind": "struct"})
+	}
+	for _, m := range solEnumRe.FindAllSubmatchIndex(src, -1) {
+		name := string(src[m[2]:m[3]])
+		line := lineAt(src, m[0])
+		end := findBlockEnd(lines, line)
+		add(name, graph.KindType, line, end, map[string]any{"sol_kind": "enum"})
+	}
+	for _, m := range solVarRe.FindAllSubmatchIndex(src, -1) {
+		name := string(src[m[4]:m[5]])
+		if isSolidityType(strings.ToLower(name)) {
+			continue
+		}
+		line := lineAt(src, m[0])
+		add(name, graph.KindVariable, line, line, nil)
+	}
+
+	for _, m := range solImportRe.FindAllSubmatchIndex(src, -1) {
+		path := string(src[m[2]:m[3]])
+		line := lineAt(src, m[0])
+		result.Edges = append(result.Edges, &graph.Edge{
+			From: fileNode.ID, To: "unresolved::import::" + path,
+			Kind: graph.EdgeImports, FilePath: filePath, Line: line,
+		})
+	}
+
+	funcRanges := buildFuncRanges(result)
+	for _, m := range solCallRe.FindAllSubmatchIndex(src, -1) {
+		name := string(src[m[2]:m[3]])
+		if isSolidityKeyword(name) || isSolidityType(strings.ToLower(name)) {
+			continue
+		}
+		line := lineAt(src, m[0])
+		callerID := findEnclosingFunc(funcRanges, line)
+		if callerID == "" || strings.HasSuffix(callerID, "::"+name) {
+			continue
+		}
+		result.Edges = append(result.Edges, &graph.Edge{
+			From: callerID, To: "unresolved::" + name,
+			Kind: graph.EdgeCalls, FilePath: filePath, Line: line,
+		})
+	}
+
+	return result, nil
+}
+
+func isSolidityKeyword(s string) bool {
+	switch s {
+	case "if", "else", "for", "while", "do", "break", "continue", "return",
+		"function", "modifier", "event", "struct", "enum", "contract",
+		"library", "interface", "abstract", "pragma", "import", "using",
+		"new", "delete", "emit", "payable", "view", "pure", "public",
+		"private", "internal", "external", "memory", "storage", "calldata",
+		"require", "assert", "revert", "assembly", "true", "false", "null":
+		return true
+	}
+	return false
+}
+
+func isSolidityType(s string) bool {
+	if strings.HasPrefix(s, "uint") || strings.HasPrefix(s, "int") ||
+		strings.HasPrefix(s, "bytes") {
+		return true
+	}
+	switch s {
+	case "address", "bool", "string", "bytes", "byte", "mapping":
+		return true
+	}
+	return false
+}
+
+var _ parser.Extractor = (*SolidityExtractor)(nil)