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|
package jobparser
import (
"fmt"
"regexp"
"strings"
"github.com/nektos/act/pkg/exprparser"
"gopkg.in/yaml.v3"
)
// ExpressionEvaluator is copied from runner.expressionEvaluator,
// to avoid unnecessary dependencies
type ExpressionEvaluator struct {
interpreter exprparser.Interpreter
}
func NewExpressionEvaluator(interpreter exprparser.Interpreter) *ExpressionEvaluator {
return &ExpressionEvaluator{interpreter: interpreter}
}
func (ee ExpressionEvaluator) evaluate(in string, defaultStatusCheck exprparser.DefaultStatusCheck) (interface{}, error) {
evaluated, err := ee.interpreter.Evaluate(in, defaultStatusCheck)
return evaluated, err
}
func (ee ExpressionEvaluator) evaluateScalarYamlNode(node *yaml.Node) error {
var in string
if err := node.Decode(&in); err != nil {
return err
}
if !strings.Contains(in, "${{") || !strings.Contains(in, "}}") {
return nil
}
expr, _ := rewriteSubExpression(in, false)
res, err := ee.evaluate(expr, exprparser.DefaultStatusCheckNone)
if err != nil {
return err
}
return node.Encode(res)
}
func (ee ExpressionEvaluator) evaluateMappingYamlNode(node *yaml.Node) error {
// GitHub has this undocumented feature to merge maps, called insert directive
insertDirective := regexp.MustCompile(`\${{\s*insert\s*}}`)
for i := 0; i < len(node.Content)/2; {
k := node.Content[i*2]
v := node.Content[i*2+1]
if err := ee.EvaluateYamlNode(v); err != nil {
return err
}
var sk string
// Merge the nested map of the insert directive
if k.Decode(&sk) == nil && insertDirective.MatchString(sk) {
node.Content = append(append(node.Content[:i*2], v.Content...), node.Content[(i+1)*2:]...)
i += len(v.Content) / 2
} else {
if err := ee.EvaluateYamlNode(k); err != nil {
return err
}
i++
}
}
return nil
}
func (ee ExpressionEvaluator) evaluateSequenceYamlNode(node *yaml.Node) error {
for i := 0; i < len(node.Content); {
v := node.Content[i]
// Preserve nested sequences
wasseq := v.Kind == yaml.SequenceNode
if err := ee.EvaluateYamlNode(v); err != nil {
return err
}
// GitHub has this undocumented feature to merge sequences / arrays
// We have a nested sequence via evaluation, merge the arrays
if v.Kind == yaml.SequenceNode && !wasseq {
node.Content = append(append(node.Content[:i], v.Content...), node.Content[i+1:]...)
i += len(v.Content)
} else {
i++
}
}
return nil
}
func (ee ExpressionEvaluator) EvaluateYamlNode(node *yaml.Node) error {
switch node.Kind {
case yaml.ScalarNode:
return ee.evaluateScalarYamlNode(node)
case yaml.MappingNode:
return ee.evaluateMappingYamlNode(node)
case yaml.SequenceNode:
return ee.evaluateSequenceYamlNode(node)
default:
return nil
}
}
func (ee ExpressionEvaluator) Interpolate(in string) string {
if !strings.Contains(in, "${{") || !strings.Contains(in, "}}") {
return in
}
expr, _ := rewriteSubExpression(in, true)
evaluated, err := ee.evaluate(expr, exprparser.DefaultStatusCheckNone)
if err != nil {
return ""
}
value, ok := evaluated.(string)
if !ok {
panic(fmt.Sprintf("Expression %s did not evaluate to a string", expr))
}
return value
}
func escapeFormatString(in string) string {
return strings.ReplaceAll(strings.ReplaceAll(in, "{", "{{"), "}", "}}")
}
func rewriteSubExpression(in string, forceFormat bool) (string, error) {
if !strings.Contains(in, "${{") || !strings.Contains(in, "}}") {
return in, nil
}
strPattern := regexp.MustCompile("(?:''|[^'])*'")
pos := 0
exprStart := -1
strStart := -1
var results []string
formatOut := ""
for pos < len(in) {
if strStart > -1 {
matches := strPattern.FindStringIndex(in[pos:])
if matches == nil {
panic("unclosed string.")
}
strStart = -1
pos += matches[1]
} else if exprStart > -1 {
exprEnd := strings.Index(in[pos:], "}}")
strStart = strings.Index(in[pos:], "'")
if exprEnd > -1 && strStart > -1 {
if exprEnd < strStart {
strStart = -1
} else {
exprEnd = -1
}
}
if exprEnd > -1 {
formatOut += fmt.Sprintf("{%d}", len(results))
results = append(results, strings.TrimSpace(in[exprStart:pos+exprEnd]))
pos += exprEnd + 2
exprStart = -1
} else if strStart > -1 {
pos += strStart + 1
} else {
panic("unclosed expression.")
}
} else {
exprStart = strings.Index(in[pos:], "${{")
if exprStart != -1 {
formatOut += escapeFormatString(in[pos : pos+exprStart])
exprStart = pos + exprStart + 3
pos = exprStart
} else {
formatOut += escapeFormatString(in[pos:])
pos = len(in)
}
}
}
if len(results) == 1 && formatOut == "{0}" && !forceFormat {
return in, nil
}
out := fmt.Sprintf("format('%s', %s)", strings.ReplaceAll(formatOut, "'", "''"), strings.Join(results, ", "))
return out, nil
}
|
