47 lines
1.1 KiB
C
47 lines
1.1 KiB
C
#include "../mpc.h"
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int main(int argc, char **argv) {
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mpc_parser_t *Expr = mpc_new("expression");
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mpc_parser_t *Prod = mpc_new("product");
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mpc_parser_t *Value = mpc_new("value");
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mpc_parser_t *Maths = mpc_new("maths");
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mpca_lang(MPC_LANG_PREDICTIVE,
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" \
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expression : <product> (('+' | '-') <product>)*; \
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product : <value> (('*' | '/') <value>)*; \
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value : /[0-9]+/ | '(' <expression> ')'; \
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maths : /^/ <expression> /$/; \
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",
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Expr, Prod, Value, Maths);
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if (argc > 1) {
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mpc_result_t r;
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if (mpc_parse_contents(argv[1], Maths, &r)) {
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mpc_ast_print(r.output);
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mpc_ast_delete(r.output);
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} else {
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mpc_err_print(r.error);
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mpc_err_delete(r.error);
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}
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} else {
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mpc_result_t r;
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if (mpc_parse_pipe("<stdin>", stdin, Maths, &r)) {
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mpc_ast_print(r.output);
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mpc_ast_delete(r.output);
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} else {
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mpc_err_print(r.error);
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mpc_err_delete(r.error);
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}
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}
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mpc_cleanup(4, Expr, Prod, Value, Maths);
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return 0;
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} |