50 lines
1.7 KiB
Plaintext
50 lines
1.7 KiB
Plaintext
// PatternBuilder — パターン条件ビルダー（コンパイル時メタ）
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// 生成物は AST JSON v0 の条件式（文字列）。
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static box PatternBuilder {
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// eq(lhs, rhs) => lhs == rhs
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eq(lhs_json, rhs_json) {
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local JB = include "apps/lib/json_builder.nyash"
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return JB.binary("==", lhs_json, rhs_json)
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}
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// or_([c1, c2, ...]) => c1 || c2 || ... （空は false）
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or_(conds) {
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local JB = include "apps/lib/json_builder.nyash"
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if conds.length() == 0 { return JB.literal_bool(false) }
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if conds.length() == 1 { return conds.get(0) }
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local i = 1
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local acc = conds.get(0)
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loop(i < conds.length()) {
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acc = JB.binary("||", acc, conds.get(i))
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i = i + 1
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}
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return acc
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}
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// and_([g1, g2, ...]) => g1 && g2 && ... （空は true）
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and_(conds) {
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local JB = include "apps/lib/json_builder.nyash"
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if conds.length() == 0 { return JB.literal_bool(true) }
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if conds.length() == 1 { return conds.get(0) }
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local i = 1
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local acc = conds.get(0)
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loop(i < conds.length()) {
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acc = JB.binary("&&", acc, conds.get(i))
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i = i + 1
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}
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return acc
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}
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// type_is(type_name, expr_json)
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// Lowering 規約: MethodCall(object=expr, method="is", arguments=[Literal(String type_name)])
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// → MIR::TypeOp(Check, value=expr, ty=map(type_name)) に降下される（src/mir/builder/exprs.rs）。
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type_is(type_name, expr_json) {
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local t = "{\"kind\":\"Literal\",\"value\":{\"type\":\"string\",\"value\":\"" + type_name + "\"}}"
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return "{\"kind\":\"MethodCall\",\"object\":" + expr_json + ",\"method\":\"is\",\"arguments\":[" + t + "]}"
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}
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// default マーカー（条件式ではない）。
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default() { return "__NY_PATTERN_DEFAULT" }
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}
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