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78 lines
1.2 KiB
Go
78 lines
1.2 KiB
Go
package reducer
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import (
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_ "embed"
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"fmt"
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"strings"
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)
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func js(args []string) string {
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rs := "\n"
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for i, a := range args {
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rs += " try {"
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switch {
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case a == ".":
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rs += `
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x = function ()
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{ return this }
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.call(x)
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`
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case flatMapRegex.MatchString(a):
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code := fold(strings.Split(a, "[]"))
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rs += fmt.Sprintf(
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`
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x = (
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%v
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)(x)
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`, code)
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case strings.HasPrefix(a, ".["):
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rs += fmt.Sprintf(
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`
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x = function ()
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{ return this%v }
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.call(x)
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`, a[1:])
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case strings.HasPrefix(a, "."):
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rs += fmt.Sprintf(
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`
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x = function ()
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{ return this%v }
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.call(x)
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`, a)
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default:
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rs += fmt.Sprintf(
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`
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let f = function ()
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{ return %v }
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.call(x)
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x = typeof f === 'function' ? f(x) : f
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`, a)
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}
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// Generate a beautiful error message.
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rs += " } catch (e) {\n"
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pre, post, pointer := trace(args, i)
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rs += fmt.Sprintf(
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" throw `\\n ${%q} ${%q} ${%q}\\n %v\\n\\n${e.stack || e}`\n",
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pre, a, post, pointer,
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)
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rs += " }\n"
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}
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fn := `function reduce(input) {
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let x = JSON.parse(input)
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// Reducers %v
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if (typeof x === 'undefined') {
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return 'null'
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} else {
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return JSON.stringify(x)
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}
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}
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`
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return fmt.Sprintf(fn, rs)
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}
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