51 lines
1 KiB
Rust
51 lines
1 KiB
Rust
use std;
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fn unknown() -> str {
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ret "<unknown ast node>";
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}
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fn print_expr(@ast.expr expr) -> str {
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alt (expr.node) {
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case (ast.expr_lit(?lit, _)) {
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ret print_expr_lit(lit);
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}
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case (ast.expr_binary(?op, ?lhs, ?rhs, _)) {
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ret print_expr_binary(op, lhs, rhs);
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}
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case (_) {
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ret unknown();
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}
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}
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}
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fn print_expr_lit(@ast.lit lit) -> str {
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alt (lit.node) {
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case (ast.lit_str(?s)) {
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ret "\"" + s + "\"";
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}
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case (_) {
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ret unknown();
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}
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}
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}
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fn print_expr_binary(ast.binop op, @ast.expr lhs, @ast.expr rhs) -> str {
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alt (op) {
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case (ast.add) {
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auto l = print_expr(lhs);
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auto r = print_expr(rhs);
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ret l + " + " + r;
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}
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}
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}
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//
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// Local Variables:
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// mode: rust
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// fill-column: 78;
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// indent-tabs-mode: nil
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// c-basic-offset: 4
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// buffer-file-coding-system: utf-8-unix
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// compile-command: "make -k -C ../.. 2>&1 | sed -e 's/\\/x\\//x:\\//g'";
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// End:
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//
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