39 lines
1 KiB
C++
39 lines
1 KiB
C++
#include "tree_sitter/compiler.h"
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namespace tree_sitter_examples {
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using tree_sitter::Grammar;
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using namespace tree_sitter::rules;
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using std::string;
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static rule_ptr infix_op(string op, int precedence) {
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return prec(precedence, seq({
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sym("expression"),
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str(op),
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sym("expression") }));
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}
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extern const Grammar arithmetic({
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{ "expression", choice({
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sym("sum"),
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sym("difference"),
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sym("product"),
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sym("quotient"),
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sym("exponent"),
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sym("group"),
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sym("number"),
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sym("variable") }) },
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{ "sum", infix_op("+", 1) },
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{ "difference", infix_op("-", 1) },
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{ "product", infix_op("*", 2) },
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{ "quotient", infix_op("/", 2) },
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{ "exponent", infix_op("^", 3) },
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{ "group", seq({
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str("("),
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err(sym("expression")),
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str(")") }) },
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{ "number", pattern("\\d+") },
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{ "variable", pattern("\\a[\\w_]*") },
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});
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}
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