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Extract shared helper functions from example grammars

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This commit is contained in:
Max Brunsfeld 2014-04-27 21:45:05 -07:00
parent 29bbff655c
commit b86203d205
8 changed files with 1888 additions and 1507 deletions
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41
examples/grammars/javascript.cc
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@ -1,44 +1,10 @@
#include "tree_sitter/compiler.h"
#include "helpers.h"
namespace tree_sitter_examples {
using tree_sitter::Grammar;
using namespace tree_sitter::rules;
static rule_ptr optional(rule_ptr rule) {
return choice({ rule, blank() });
}
static rule_ptr in_parens(rule_ptr rule) {
return seq({ str("("), rule, str(")") });
}
static rule_ptr in_braces(rule_ptr rule) {
return seq({ str("{"), rule, str("}") });
}
static rule_ptr in_brackets(rule_ptr rule) {
return seq({ str("["), rule, str("]") });
}
static rule_ptr comma_sep(rule_ptr element) {
return choice({
seq({ element, repeat(seq({ str(","), element })) }),
blank() });
}
static rule_ptr infix(int precedence, std::string op) {
return prec(precedence, seq({
sym("expression"),
str(op),
sym("expression") }));
}
static rule_ptr prefix(int precedence, std::string op) {
return prec(precedence, seq({
str(op),
sym("expression") }));
}
extern const Grammar javascript({
{ "program", repeat(sym("statement")) },
@ -73,9 +39,7 @@ namespace tree_sitter_examples {
sym("statement") }))) }) },
{ "switch_statement", seq({
sym("_switch"),
str("("),
err(sym("expression")),
str(")"),
in_parens(err(sym("expression"))),
in_braces(repeat(sym("switch_case"))) }) },
{ "switch_case", seq({
choice({
@ -113,7 +77,6 @@ namespace tree_sitter_examples {
sym("property_access"),
sym("assignment"),
sym("ternary"),
sym("literal"),
sym("math_op"),
sym("bool_op"),
sym("literal"),