52 lines
1.4 KiB
Plaintext
52 lines
1.4 KiB
Plaintext
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// upper_string_macro.nyash
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// MacroBoxSpec.expand: uppercase string literal values that start with "UPPER:" in AST JSON v0
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// Contract: expand(json: string) -> string (AST JSON v0)
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static box MacroBoxSpec {
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expand(json) {
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local s, out, i, plen, pat
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s = json
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out = ""
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i = 0
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pat = "\"value\":\"UPPER:"
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plen = pat.length()
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loop(i < s.length()) {
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// Match pattern: "value":"UPPER:
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if i + plen <= s.length() && s.substring(i, i + plen) == pat {
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// Emit the JSON key and opening quote: "value":"
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out = out + "\"value\":\""
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// Skip the pattern (drop the literal prefix UPPER:)
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i = i + plen
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// Uppercase until the closing quote (handle escapes conservatively)
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local j, ch, up
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j = i
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loop(j < s.length()) {
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ch = s.substring(j, j + 1)
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if ch == "\\" { // copy escaped char as-is
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if j + 1 < s.length() {
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out = out + s.substring(j, j + 2)
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j = j + 2
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continue
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}
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}
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if ch == "\"" {
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break
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}
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up = ch.toUpperCase()
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out = out + up
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j = j + 1
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}
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// Append the closing quote and advance pointer past it
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out = out + "\""
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i = j + 1
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} else {
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// Copy-through
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out = out + s.substring(i, i + 1)
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i = i + 1
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}
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}
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return out
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}
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}
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