cloudflare/pint
Publicmirrored from https://github.com/cloudflare/pintAvailable
cmd/pint/parse.go
130lines · modecode
| 1 | package main |
| 2 | |
| 3 | import ( |
| 4 | "fmt" |
| 5 | "strings" |
| 6 | |
| 7 | "github.com/prometheus/prometheus/promql/parser" |
| 8 | "github.com/urfave/cli/v2" |
| 9 | ) |
| 10 | |
| 11 | const levelStep = 2 |
| 12 | |
| 13 | var parseCmd = &cli.Command{ |
| 14 | Name: "parse", |
| 15 | Usage: "Parse a query and print AST, use it for debugging or understanding query details.", |
| 16 | Action: actionParse, |
| 17 | } |
| 18 | |
| 19 | func printNode(ident int, format string, a ...interface{}) { |
| 20 | prefix := strings.Repeat(" ", ident) |
| 21 | fmt.Printf(prefix+format+"\n", a...) |
| 22 | } |
| 23 | |
| 24 | func parseNode(node parser.Node, level int) { |
| 25 | printNode(level, "++ node: %v", node) |
| 26 | level += levelStep |
| 27 | |
| 28 | switch n := node.(type) { |
| 29 | case parser.Expressions: |
| 30 | printNode(level, "Expressions:") |
| 31 | for _, e := range n { |
| 32 | parseNode(e, level+levelStep) |
| 33 | } |
| 34 | case *parser.AggregateExpr: |
| 35 | printNode(level, "AggregateExpr:") |
| 36 | level += levelStep |
| 37 | printNode(level, "* Type: %v", n.Type()) |
| 38 | printNode(level, "* Op: %v", n.Op) |
| 39 | printNode(level, "* Expr: %v", n.Expr) |
| 40 | printNode(level, "* Param: %v", n.Param) |
| 41 | printNode(level, "* Grouping: %v", n.Grouping) |
| 42 | printNode(level, "* Without: %v", n.Without) |
| 43 | parseNode(n.Expr, level+levelStep) |
| 44 | case *parser.BinaryExpr: |
| 45 | printNode(level, "BinaryExpr:") |
| 46 | level += levelStep |
| 47 | printNode(level, "* Type: %v", n.Type()) |
| 48 | printNode(level, "* Op: %v", n.Op) |
| 49 | printNode(level, "* LHS: %v", n.LHS) |
| 50 | printNode(level, "* RHS: %v", n.RHS) |
| 51 | printNode(level, "* VectorMatching:") |
| 52 | if n.VectorMatching != nil { |
| 53 | printNode(level+levelStep, "* Card: %v", n.VectorMatching.Card) |
| 54 | printNode(level+levelStep, "* MatchingLabels: %v", n.VectorMatching.MatchingLabels) |
| 55 | printNode(level+levelStep, "* On: %v", n.VectorMatching.On) |
| 56 | printNode(level+levelStep, "* Include: %v", n.VectorMatching.Include) |
| 57 | } |
| 58 | printNode(level, "* ReturnBool: %v", n.ReturnBool) |
| 59 | parseNode(n.LHS, level+levelStep) |
| 60 | parseNode(n.RHS, level+levelStep) |
| 61 | case *parser.Call: |
| 62 | printNode(level, "Call:") |
| 63 | level += levelStep |
| 64 | printNode(level, "* Type: %v", n.Type()) |
| 65 | printNode(level, "* Func: %v", n.Func.Name) |
| 66 | printNode(level, "* Args: %v", n.Args) |
| 67 | parseNode(n.Args, level+levelStep) |
| 68 | case *parser.ParenExpr: |
| 69 | printNode(level, "ParenExpr:") |
| 70 | level += levelStep |
| 71 | printNode(level, "* Type: %v", n.Type()) |
| 72 | printNode(level, "* Expr: %v", n.Expr) |
| 73 | parseNode(n.Expr, level+levelStep) |
| 74 | case *parser.SubqueryExpr: |
| 75 | printNode(level, "SubqueryExpr:") |
| 76 | level += levelStep |
| 77 | printNode(level, "* Type: %v", n.Type()) |
| 78 | printNode(level, "* Expr: %v", n.Expr) |
| 79 | printNode(level, "* Step: %v", n.Step) |
| 80 | printNode(level, "* Range: %v", n.Range) |
| 81 | printNode(level, "* Offset: %v", n.Offset) |
| 82 | parseNode(n.Expr, level+levelStep) |
| 83 | case *parser.MatrixSelector: |
| 84 | printNode(level, "MatrixSelector:") |
| 85 | level += levelStep |
| 86 | printNode(level, "* Type: %v", n.Type()) |
| 87 | printNode(level, "* VectorSelector: %v", n.VectorSelector) |
| 88 | printNode(level, "* Range: %v", n.Range) |
| 89 | case *parser.VectorSelector: |
| 90 | printNode(level, "VectorSelector:") |
| 91 | level += levelStep |
| 92 | printNode(level, "* Type: %v", n.Type()) |
| 93 | printNode(level, "* Name: %v", n.Name) |
| 94 | printNode(level, "* Offset: %v", n.Offset) |
| 95 | printNode(level, "* LabelMatchers: %v", n.LabelMatchers) |
| 96 | case *parser.NumberLiteral: |
| 97 | printNode(level, "NumberLiteral:") |
| 98 | level += levelStep |
| 99 | printNode(level, "* Type: %v", n.Type()) |
| 100 | case *parser.StringLiteral: |
| 101 | printNode(level, "StringLiteral:") |
| 102 | level += levelStep |
| 103 | printNode(level, "* Type: %v", n.Type()) |
| 104 | default: |
| 105 | printNode(level, "! Unsupported node") |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | func parseQuery(query string) error { |
| 110 | expr, err := parser.ParseExpr(query) |
| 111 | if err != nil { |
| 112 | return err |
| 113 | } |
| 114 | parseNode(expr, 0) |
| 115 | return nil |
| 116 | } |
| 117 | |
| 118 | func actionParse(c *cli.Context) (err error) { |
| 119 | err = initLogger(c.String(logLevelFlag), c.Bool(noColorFlag)) |
| 120 | if err != nil { |
| 121 | return fmt.Errorf("failed to set log level: %w", err) |
| 122 | } |
| 123 | |
| 124 | parts := c.Args().Slice() |
| 125 | if len(parts) == 0 { |
| 126 | return fmt.Errorf("a query string is required") |
| 127 | } |
| 128 | query := strings.Join(parts, " ") |
| 129 | return parseQuery(query) |
| 130 | } |