mirror of https://github.com/pulumi/pulumi.git
395 lines
10 KiB
Go
395 lines
10 KiB
Go
package python
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import (
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"bufio"
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"bytes"
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"fmt"
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"io"
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"math/big"
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"strings"
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"github.com/hashicorp/hcl/v2"
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"github.com/hashicorp/hcl/v2/hclsyntax"
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"github.com/pulumi/pulumi/pkg/v2/codegen/hcl2"
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"github.com/pulumi/pulumi/pkg/v2/codegen/hcl2/model"
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"github.com/pulumi/pulumi/sdk/v2/go/common/util/contract"
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"github.com/zclconf/go-cty/cty"
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)
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type nameInfo int
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func (nameInfo) IsReservedWord(word string) bool {
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return isReservedWord(word)
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}
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func (g *generator) genExpression(expr model.Expression) string {
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// TODO(pdg): diagnostics
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expr, _ = hcl2.RewriteApplies(expr, nameInfo(0), false)
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expr, _ = g.lowerProxyApplies(expr)
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var buf bytes.Buffer
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g.Fgen(&buf, expr)
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return buf.String()
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}
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func (g *generator) GenAnonymousFunctionExpression(w io.Writer, expr *model.AnonymousFunctionExpression) {
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g.Fgen(w, "lambda")
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for i, p := range expr.Signature.Parameters {
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if i > 0 {
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g.Fgen(w, ",")
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}
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g.Fgenf(w, " %s", p.Name)
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}
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g.Fgenf(w, ": %v", expr.Body)
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}
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func (g *generator) GenBinaryOpExpression(w io.Writer, expr *model.BinaryOpExpression) {
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opstr := ","
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switch expr.Operation {
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case hclsyntax.OpAdd:
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opstr = "+"
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case hclsyntax.OpDivide:
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opstr = "/"
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case hclsyntax.OpEqual:
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opstr = "=="
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case hclsyntax.OpGreaterThan:
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opstr = ">"
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case hclsyntax.OpGreaterThanOrEqual:
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opstr = ">="
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case hclsyntax.OpLessThan:
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opstr = "<"
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case hclsyntax.OpLessThanOrEqual:
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opstr = "<="
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case hclsyntax.OpLogicalAnd:
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opstr = "and"
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case hclsyntax.OpLogicalOr:
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opstr = "or"
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case hclsyntax.OpModulo:
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opstr = "%"
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case hclsyntax.OpMultiply:
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opstr = "*"
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case hclsyntax.OpNotEqual:
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opstr = "!="
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case hclsyntax.OpSubtract:
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opstr = "-"
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}
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g.Fgenf(w, "%v %v %v", expr.LeftOperand, opstr, expr.RightOperand)
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}
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func (g *generator) GenConditionalExpression(w io.Writer, expr *model.ConditionalExpression) {
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g.Fgenf(w, "%v if %v else %v", expr.TrueResult, expr.Condition, expr.FalseResult)
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}
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func (g *generator) GenForExpression(w io.Writer, expr *model.ForExpression) {
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close := "]"
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if expr.Key != nil {
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// Dictionary comprehension
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//
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// TODO(pdg): grouping
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g.Fgenf(w, "{%v: %v", expr.Key, expr.Value)
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close = "}"
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} else {
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// List comprehension
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g.Fgenf(w, "[%v", expr.Value)
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}
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if expr.KeyVariable == nil {
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g.Fgenf(w, " for %v in %v", expr.ValueVariable, expr.Collection)
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} else {
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g.Fgenf(w, " for %v, %v in %v", expr.KeyVariable, expr.ValueVariable, expr.Collection)
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}
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if expr.Condition != nil {
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g.Fgenf(w, " if %v", expr.Condition)
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}
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g.Fprint(w, close)
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}
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func (g *generator) genApply(w io.Writer, expr *model.FunctionCallExpression) {
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// Extract the list of outputs and the continuation expression from the `__apply` arguments.
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applyArgs, then := hcl2.ParseApplyCall(expr)
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if len(applyArgs) == 1 {
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// If we only have a single output, just generate a normal `.apply`.
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g.Fgenf(w, "%v.apply(%v)", applyArgs[0], then)
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} else {
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// Otherwise, generate a call to `pulumi.all([]).apply()`.
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g.Fgen(w, "pulumi.Output.all(")
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for i, o := range applyArgs {
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if i > 0 {
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g.Fgen(w, ", ")
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}
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g.Fgenf(w, "%v", o)
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}
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g.Fgenf(w, ").apply(%v)", then)
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}
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}
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// functionName computes the NodeJS package, module, and name for the given function token.
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func functionName(tokenArg model.Expression) (string, string, string, hcl.Diagnostics) {
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token := tokenArg.(*model.TemplateExpression).Parts[0].(*model.LiteralValueExpression).Value.AsString()
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tokenRange := tokenArg.SyntaxNode().Range()
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// Compute the resource type from the Pulumi type token.
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pkg, module, member, diagnostics := hcl2.DecomposeToken(token, tokenRange)
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return cleanName(pkg), strings.Replace(module, "/", ".", -1), title(member), diagnostics
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}
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func (g *generator) GenFunctionCallExpression(w io.Writer, expr *model.FunctionCallExpression) {
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switch expr.Name {
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case hcl2.IntrinsicApply:
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g.genApply(w, expr)
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case "entries":
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g.Fgenf(w, `[{"key": k, "value": v} for k, v in %v]`, expr.Args[0])
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case "fileArchive":
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g.Fgenf(w, "pulumi.FileArchive(%v)", expr.Args[0])
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case "fileAsset":
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g.Fgenf(w, "pulumi.FileAsset(%v)", expr.Args[0])
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case "invoke":
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pkg, module, fn, diags := functionName(expr.Args[0])
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contract.Assert(len(diags) == 0)
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if module != "" {
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module = "." + module
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}
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name := fmt.Sprintf("%s%s.%s", pkg, module, PyName(fn))
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optionsBag := ""
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if len(expr.Args) == 3 {
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var buf bytes.Buffer
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g.Fgenf(&buf, ", %v", expr.Args[2])
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optionsBag = buf.String()
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}
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g.Fgenf(w, "%s(%v%v)", name, expr.Args[1], optionsBag)
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case "range":
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g.Fprint(w, "range(")
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for i, arg := range expr.Args {
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if i > 0 {
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g.Fprint(w, ", ")
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}
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g.Fgenf(w, "%v", arg)
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}
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g.Fprint(w, ")")
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case "toJSON":
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g.Fgenf(w, "json.dumps(%v)", expr.Args[0])
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default:
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var rng hcl.Range
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if expr.Syntax != nil {
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rng = expr.Syntax.Range()
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}
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g.genNYI(w, "FunctionCallExpression: %v (%v)", expr.Name, rng)
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}
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}
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func (g *generator) GenIndexExpression(w io.Writer, expr *model.IndexExpression) {
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g.Fgenf(w, "%v[%v]", expr.Collection, expr.Key)
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}
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type runeWriter interface {
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WriteRune(c rune) (int, error)
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}
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// nolint: errcheck
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func (g *generator) genEscapedString(w runeWriter, v string, escapeNewlines, escapeBraces bool) {
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for _, c := range v {
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switch c {
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case '\n':
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if escapeNewlines {
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w.WriteRune('\\')
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c = 'n'
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}
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case '"', '\\':
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w.WriteRune('\\')
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case '{', '}':
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if escapeBraces {
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w.WriteRune(c)
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}
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}
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w.WriteRune(c)
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}
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}
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func (g *generator) genStringLiteral(w io.Writer, v string) {
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builder := &strings.Builder{}
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newlines := strings.Count(v, "\n")
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if newlines == 0 || newlines == 1 && (v[0] == '\n' || v[len(v)-1] == '\n') {
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// This string either does not contain newlines or contains a single leading or trailing newline, so we'll
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// Generate a short string literal. Quotes, backslashes, and newlines will be escaped in conformance with
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// https://docs.python.org/3.7/reference/lexical_analysis.html#literals.
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builder.WriteRune('"')
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g.genEscapedString(builder, v, true, false)
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builder.WriteRune('"')
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} else {
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// This string does contain newlines, so we'll generate a long string literal. "${", backquotes, and
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// backslashes will be escaped in conformance with
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// https://docs.python.org/3.7/reference/lexical_analysis.html#literals.
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builder.WriteString(`"""`)
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g.genEscapedString(builder, v, false, false)
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builder.WriteString(`"""`)
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}
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g.Fgenf(w, "%s", builder.String())
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}
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func (g *generator) GenLiteralValueExpression(w io.Writer, expr *model.LiteralValueExpression) {
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switch expr.Type() {
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case model.BoolType:
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if expr.Value.True() {
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g.Fgen(w, "True")
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} else {
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g.Fgen(w, "False")
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}
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case model.NumberType:
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bf := expr.Value.AsBigFloat()
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if i, acc := bf.Int64(); acc == big.Exact {
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g.Fgenf(w, "%d", i)
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} else {
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f, _ := bf.Float64()
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g.Fgenf(w, "%g", f)
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}
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case model.StringType:
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g.genStringLiteral(w, expr.Value.AsString())
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default:
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contract.Failf("unexpected literal type in GenLiteralValueExpression: %v (%v)", expr.Type(),
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expr.SyntaxNode().Range())
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}
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}
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func (g *generator) GenObjectConsExpression(w io.Writer, expr *model.ObjectConsExpression) {
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if len(expr.Items) == 0 {
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g.Fgen(w, "{}")
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} else {
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g.Fgen(w, "{")
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g.Indented(func() {
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for _, item := range expr.Items {
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g.Fgenf(w, "\n%s%v: %v,", g.Indent, item.Key, item.Value)
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}
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})
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g.Fgenf(w, "\n%s}", g.Indent)
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}
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}
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func (g *generator) genRelativeTraversal(w io.Writer, traversal hcl.Traversal, types []model.Traversable) {
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for _, part := range traversal {
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var key cty.Value
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switch part := part.(type) {
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case hcl.TraverseAttr:
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key = cty.StringVal(part.Name)
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case hcl.TraverseIndex:
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key = part.Key
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default:
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contract.Failf("unexpected traversal part of type %T (%v)", part, part.SourceRange())
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}
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switch key.Type() {
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case cty.String:
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keyVal := key.AsString()
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if isLegalIdentifier(keyVal) {
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g.Fgenf(w, ".%s", keyVal)
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} else {
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g.Fgenf(w, "[%q]", keyVal)
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}
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case cty.Number:
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idx, _ := key.AsBigFloat().Int64()
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g.Fgenf(w, "[%d]", idx)
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default:
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g.Fgenf(w, "[%q]", key.AsString())
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}
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}
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}
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func (g *generator) GenRelativeTraversalExpression(w io.Writer, expr *model.RelativeTraversalExpression) {
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g.Fgen(w, expr.Source)
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g.genRelativeTraversal(w, expr.Traversal, expr.Parts)
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}
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func (g *generator) GenScopeTraversalExpression(w io.Writer, expr *model.ScopeTraversalExpression) {
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rootName := PyName(expr.RootName)
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if v, ok := expr.Parts[0].(*model.Variable); ok && g.anonymousVariables.Has(v) {
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rootName = "__item"
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}
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g.Fgen(w, rootName)
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g.genRelativeTraversal(w, expr.Traversal.SimpleSplit().Rel, expr.Parts)
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}
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func (g *generator) GenSplatExpression(w io.Writer, expr *model.SplatExpression) {
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g.anonymousVariables.Add(expr.Item)
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g.Fgenf(w, "[%v for __item in %v]", expr.Each, expr.Source)
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}
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func (g *generator) GenTemplateExpression(w io.Writer, expr *model.TemplateExpression) {
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if len(expr.Parts) == 1 {
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if lit, ok := expr.Parts[0].(*model.LiteralValueExpression); ok && lit.Type() == model.StringType {
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g.GenLiteralValueExpression(w, lit)
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return
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}
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}
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isMultiLine, quotes := false, `"`
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for i, part := range expr.Parts {
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if lit, ok := part.(*model.LiteralValueExpression); ok && lit.Type() == model.StringType {
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v := lit.Value.AsString()
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switch strings.Count(v, "\n") {
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case 0:
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continue
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case 1:
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if i == 0 && v[0] == '\n' || i == len(expr.Parts)-1 && v[len(v)-1] == '\n' {
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continue
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}
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}
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isMultiLine, quotes = true, `"""`
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break
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}
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}
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b := bufio.NewWriter(w)
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defer b.Flush()
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g.Fprintf(b, `f%s`, quotes)
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for _, expr := range expr.Parts {
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if lit, ok := expr.(*model.LiteralValueExpression); ok && lit.Type() == model.StringType {
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g.genEscapedString(b, lit.Value.AsString(), !isMultiLine, true)
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} else {
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g.Fgenf(b, "{%v}", expr)
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}
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}
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g.Fprint(b, quotes)
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}
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func (g *generator) GenTemplateJoinExpression(w io.Writer, expr *model.TemplateJoinExpression) {
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g.genNYI(w, "TemplateJoinExpression")
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}
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func (g *generator) GenTupleConsExpression(w io.Writer, expr *model.TupleConsExpression) {
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switch len(expr.Expressions) {
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case 0:
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g.Fgen(w, "[]")
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case 1:
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g.Fgenf(w, "[%v]", expr.Expressions[0])
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default:
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g.Fgen(w, "[")
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g.Indented(func() {
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for _, v := range expr.Expressions {
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g.Fgenf(w, "\n%s%v,", g.Indent, v)
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}
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})
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g.Fgen(w, "\n", g.Indent, "]")
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}
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}
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func (g *generator) GenUnaryOpExpression(w io.Writer, expr *model.UnaryOpExpression) {
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opstr := ""
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switch expr.Operation {
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case hclsyntax.OpLogicalNot:
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opstr = "not "
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case hclsyntax.OpNegate:
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opstr = "-"
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}
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g.Fgenf(w, "%v%v", opstr, expr.Operand)
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}
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