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package compiler
import (
"github.com/d5/tengo/compiler/ast"
"github.com/d5/tengo/compiler/parser"
"github.com/d5/tengo/objects"
)
func (c *Compiler) checkCyclicImports(node ast.Node, modulePath string) error {
if c.modulePath == modulePath {
return c.errorf(node, "cyclic module import: %s", modulePath)
} else if c.parent != nil {
return c.parent.checkCyclicImports(node, modulePath)
}
return nil
}
func (c *Compiler) compileModule(node ast.Node, moduleName, modulePath string, src []byte) (*objects.CompiledFunction, error) {
if err := c.checkCyclicImports(node, modulePath); err != nil {
return nil, err
}
compiledModule, exists := c.loadCompiledModule(modulePath)
if exists {
return compiledModule, nil
}
modFile := c.file.Set().AddFile(moduleName, -1, len(src))
p := parser.NewParser(modFile, src, nil)
file, err := p.ParseFile()
if err != nil {
return nil, err
}
symbolTable := NewSymbolTable()
// inherit builtin functions
for _, sym := range c.symbolTable.BuiltinSymbols() {
symbolTable.DefineBuiltin(sym.Index, sym.Name)
}
// no global scope for the module
symbolTable = symbolTable.Fork(false)
// compile module
moduleCompiler := c.fork(modFile, modulePath, symbolTable)
if err := moduleCompiler.Compile(file); err != nil {
return nil, err
}
// code optimization
moduleCompiler.optimizeFunc(node)
compiledFunc := moduleCompiler.Bytecode().MainFunction
compiledFunc.NumLocals = symbolTable.MaxSymbols()
c.storeCompiledModule(modulePath, compiledFunc)
return compiledFunc, nil
}
func (c *Compiler) loadCompiledModule(modulePath string) (mod *objects.CompiledFunction, ok bool) {
if c.parent != nil {
return c.parent.loadCompiledModule(modulePath)
}
mod, ok = c.compiledModules[modulePath]
return
}
func (c *Compiler) storeCompiledModule(modulePath string, module *objects.CompiledFunction) {
if c.parent != nil {
c.parent.storeCompiledModule(modulePath, module)
}
c.compiledModules[modulePath] = module
}
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