95 lines
2.5 KiB
Go
95 lines
2.5 KiB
Go
package compiler
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import (
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"bytes"
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"strings"
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"go.starlark.net/lib/math"
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"go.starlark.net/starlark"
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)
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// executeScript runs a Starlark script and returns the output lines.
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// If isLibrary is true, the script is executed at top level (no _main wrapper)
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// and resulting globals are persisted to ctx.ScriptLibraryGlobals.
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func executeScript(scriptLines []string, ctx *CompilerContext, isLibrary bool) ([]string, error) {
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// Join script lines
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scriptText := strings.Join(scriptLines, "\n")
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// Expand |varname| -> actual variable names
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scriptText = expandVariables(scriptText, ctx)
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var finalScript string
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if isLibrary {
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// LIBRARY: execute at top level so defs become globals
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finalScript = scriptText
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} else {
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// Regular SCRIPT: wrap in function (Starlark requires control flow inside functions)
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finalScript = "def _main():\n"
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for _, line := range strings.Split(scriptText, "\n") {
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finalScript += " " + line + "\n"
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}
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finalScript += "_main()\n"
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}
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// Capture print output
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var output bytes.Buffer
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thread := &starlark.Thread{
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Print: func(_ *starlark.Thread, msg string) {
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output.WriteString(msg)
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output.WriteString("\n")
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},
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}
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// Set execution limit (prevent infinite loops)
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thread.SetMaxExecutionSteps(1000000) // 1M steps
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// Build predeclared: math module + library globals
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predeclared := starlark.StringDict{
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"math": math.Module,
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}
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for k, v := range ctx.ScriptLibraryGlobals {
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predeclared[k] = v
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}
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// Execute
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globals, err := starlark.ExecFile(thread, "script.star", finalScript, predeclared)
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if err != nil {
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return nil, err
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}
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// For LIBRARY: persist new globals (functions, variables defined at top level)
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if isLibrary {
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for k, v := range globals {
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ctx.ScriptLibraryGlobals[k] = v
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}
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}
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// Split output into lines for assembly
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outputStr := output.String()
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if outputStr == "" {
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return []string{}, nil
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}
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lines := strings.Split(strings.TrimRight(outputStr, "\n"), "\n")
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return lines, nil
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}
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// expandVariables replaces |varname| with expanded variable names from symbol table
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func expandVariables(text string, ctx *CompilerContext) string {
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result := text
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for {
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start := strings.IndexByte(result, '|')
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if start == -1 {
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break
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}
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end := strings.IndexByte(result[start+1:], '|')
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if end == -1 {
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break // unclosed, let script fail
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}
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end += start + 1
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varName := result[start+1 : end]
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expandedName := ctx.SymbolTable.ExpandName(varName, ctx.CurrentScope())
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result = result[:start] + expandedName + result[end+1:]
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}
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return result
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}
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