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ruby/prism/extension.c

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41 KiB
C
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#include "prism/extension.h"
#ifdef _WIN32
#include <ruby/win32.h>
#endif
// NOTE: this file should contain only bindings. All non-trivial logic should be
// in libprism so it can be shared its the various callers.
VALUE rb_cPrism;
VALUE rb_cPrismNode;
VALUE rb_cPrismSource;
VALUE rb_cPrismToken;
VALUE rb_cPrismLocation;
VALUE rb_cPrismComment;
VALUE rb_cPrismInlineComment;
VALUE rb_cPrismEmbDocComment;
VALUE rb_cPrismMagicComment;
VALUE rb_cPrismParseError;
VALUE rb_cPrismParseWarning;
VALUE rb_cPrismResult;
VALUE rb_cPrismParseResult;
VALUE rb_cPrismLexResult;
VALUE rb_cPrismParseLexResult;
VALUE rb_cPrismDebugEncoding;
ID rb_id_option_command_line;
ID rb_id_option_encoding;
ID rb_id_option_filepath;
ID rb_id_option_frozen_string_literal;
ID rb_id_option_line;
ID rb_id_option_main_script;
ID rb_id_option_partial_script;
ID rb_id_option_scopes;
ID rb_id_option_version;
ID rb_id_source_for;
/******************************************************************************/
/* IO of Ruby code */
/******************************************************************************/
/**
* Check if the given VALUE is a string. If it's not a string, then raise a
* TypeError. Otherwise return the VALUE as a C string.
*/
static const char *
check_string(VALUE value) {
// Check if the value is a string. If it's not, then raise a type error.
if (!RB_TYPE_P(value, T_STRING)) {
rb_raise(rb_eTypeError, "wrong argument type %" PRIsVALUE " (expected String)", rb_obj_class(value));
}
// Otherwise, return the value as a C string.
return RSTRING_PTR(value);
}
/**
* Load the contents and size of the given string into the given pm_string_t.
*/
static void
input_load_string(pm_string_t *input, VALUE string) {
// Check if the string is a string. If it's not, then raise a type error.
if (!RB_TYPE_P(string, T_STRING)) {
rb_raise(rb_eTypeError, "wrong argument type %" PRIsVALUE " (expected String)", rb_obj_class(string));
}
pm_string_constant_init(input, RSTRING_PTR(string), RSTRING_LEN(string));
}
/******************************************************************************/
/* Building C options from Ruby options */
/******************************************************************************/
/**
* Build the scopes associated with the provided Ruby keyword value.
*/
static void
build_options_scopes(pm_options_t *options, VALUE scopes) {
// Check if the value is an array. If it's not, then raise a type error.
if (!RB_TYPE_P(scopes, T_ARRAY)) {
rb_raise(rb_eTypeError, "wrong argument type %"PRIsVALUE" (expected Array)", rb_obj_class(scopes));
}
// Initialize the scopes array.
size_t scopes_count = RARRAY_LEN(scopes);
if (!pm_options_scopes_init(options, scopes_count)) {
rb_raise(rb_eNoMemError, "failed to allocate memory");
}
// Iterate over the scopes and add them to the options.
for (size_t scope_index = 0; scope_index < scopes_count; scope_index++) {
VALUE scope = rb_ary_entry(scopes, scope_index);
// Check that the scope is an array. If it's not, then raise a type
// error.
if (!RB_TYPE_P(scope, T_ARRAY)) {
rb_raise(rb_eTypeError, "wrong argument type %"PRIsVALUE" (expected Array)", rb_obj_class(scope));
}
// Initialize the scope array.
size_t locals_count = RARRAY_LEN(scope);
pm_options_scope_t *options_scope = &options->scopes[scope_index];
if (!pm_options_scope_init(options_scope, locals_count)) {
rb_raise(rb_eNoMemError, "failed to allocate memory");
}
// Iterate over the locals and add them to the scope.
for (size_t local_index = 0; local_index < locals_count; local_index++) {
VALUE local = rb_ary_entry(scope, local_index);
// Check that the local is a symbol. If it's not, then raise a
// type error.
if (!RB_TYPE_P(local, T_SYMBOL)) {
rb_raise(rb_eTypeError, "wrong argument type %"PRIsVALUE" (expected Symbol)", rb_obj_class(local));
}
// Add the local to the scope.
pm_string_t *scope_local = &options_scope->locals[local_index];
const char *name = rb_id2name(SYM2ID(local));
pm_string_constant_init(scope_local, name, strlen(name));
}
}
}
/**
* An iterator function that is called for each key-value in the keywords hash.
*/
static int
build_options_i(VALUE key, VALUE value, VALUE argument) {
pm_options_t *options = (pm_options_t *) argument;
ID key_id = SYM2ID(key);
if (key_id == rb_id_option_filepath) {
if (!NIL_P(value)) pm_options_filepath_set(options, check_string(value));
} else if (key_id == rb_id_option_encoding) {
if (!NIL_P(value)) {
if (value == Qfalse) {
pm_options_encoding_locked_set(options, true);
} else {
pm_options_encoding_set(options, rb_enc_name(rb_to_encoding(value)));
}
}
} else if (key_id == rb_id_option_line) {
if (!NIL_P(value)) pm_options_line_set(options, NUM2INT(value));
} else if (key_id == rb_id_option_frozen_string_literal) {
if (!NIL_P(value)) pm_options_frozen_string_literal_set(options, RTEST(value));
} else if (key_id == rb_id_option_version) {
if (!NIL_P(value)) {
const char *version = check_string(value);
if (!pm_options_version_set(options, version, RSTRING_LEN(value))) {
rb_raise(rb_eArgError, "invalid version: %" PRIsVALUE, value);
}
}
} else if (key_id == rb_id_option_scopes) {
if (!NIL_P(value)) build_options_scopes(options, value);
} else if (key_id == rb_id_option_command_line) {
if (!NIL_P(value)) {
const char *string = check_string(value);
uint8_t command_line = 0;
for (size_t index = 0; index < strlen(string); index++) {
switch (string[index]) {
case 'a': command_line |= PM_OPTIONS_COMMAND_LINE_A; break;
case 'e': command_line |= PM_OPTIONS_COMMAND_LINE_E; break;
case 'l': command_line |= PM_OPTIONS_COMMAND_LINE_L; break;
case 'n': command_line |= PM_OPTIONS_COMMAND_LINE_N; break;
case 'p': command_line |= PM_OPTIONS_COMMAND_LINE_P; break;
case 'x': command_line |= PM_OPTIONS_COMMAND_LINE_X; break;
default: rb_raise(rb_eArgError, "invalid command line flag: '%c'", string[index]); break;
}
}
pm_options_command_line_set(options, command_line);
}
} else if (key_id == rb_id_option_main_script) {
if (!NIL_P(value)) pm_options_main_script_set(options, RTEST(value));
} else if (key_id == rb_id_option_partial_script) {
if (!NIL_P(value)) pm_options_partial_script_set(options, RTEST(value));
} else {
rb_raise(rb_eArgError, "unknown keyword: %" PRIsVALUE, key);
}
return ST_CONTINUE;
}
/**
* We need a struct here to pass through rb_protect and it has to be a single
* value. Because the sizeof(VALUE) == sizeof(void *), we're going to pass this
* through as an opaque pointer and cast it on both sides.
*/
struct build_options_data {
pm_options_t *options;
VALUE keywords;
};
/**
* Build the set of options from the given keywords. Note that this can raise a
* Ruby error if the options are not valid.
*/
static VALUE
build_options(VALUE argument) {
struct build_options_data *data = (struct build_options_data *) argument;
rb_hash_foreach(data->keywords, build_options_i, (VALUE) data->options);
return Qnil;
}
/**
* Extract the options from the given keyword arguments.
*/
static void
extract_options(pm_options_t *options, VALUE filepath, VALUE keywords) {
options->line = 1; // default
if (!NIL_P(keywords)) {
struct build_options_data data = { .options = options, .keywords = keywords };
struct build_options_data *argument = &data;
int state = 0;
rb_protect(build_options, (VALUE) argument, &state);
if (state != 0) {
pm_options_free(options);
rb_jump_tag(state);
}
}
if (!NIL_P(filepath)) {
if (!RB_TYPE_P(filepath, T_STRING)) {
pm_options_free(options);
rb_raise(rb_eTypeError, "wrong argument type %"PRIsVALUE" (expected String)", rb_obj_class(filepath));
}
pm_options_filepath_set(options, RSTRING_PTR(filepath));
}
}
/**
* Read options for methods that look like (source, **options).
*/
static void
string_options(int argc, VALUE *argv, pm_string_t *input, pm_options_t *options) {
VALUE string;
VALUE keywords;
rb_scan_args(argc, argv, "1:", &string, &keywords);
extract_options(options, Qnil, keywords);
input_load_string(input, string);
}
/**
* Read options for methods that look like (filepath, **options).
*/
static void
file_options(int argc, VALUE *argv, pm_string_t *input, pm_options_t *options, VALUE *encoded_filepath) {
VALUE filepath;
VALUE keywords;
rb_scan_args(argc, argv, "1:", &filepath, &keywords);
Check_Type(filepath, T_STRING);
*encoded_filepath = rb_str_encode_ospath(filepath);
extract_options(options, *encoded_filepath, keywords);
const char *source = (const char *) pm_string_source(&options->filepath);
pm_string_init_result_t result;
switch (result = pm_string_file_init(input, source)) {
case PM_STRING_INIT_SUCCESS:
break;
case PM_STRING_INIT_ERROR_GENERIC: {
pm_options_free(options);
#ifdef _WIN32
int e = rb_w32_map_errno(GetLastError());
#else
int e = errno;
#endif
rb_syserr_fail(e, source);
break;
}
case PM_STRING_INIT_ERROR_DIRECTORY:
pm_options_free(options);
rb_syserr_fail(EISDIR, source);
break;
default:
pm_options_free(options);
rb_raise(rb_eRuntimeError, "Unknown error (%d) initializing file: %s", result, source);
break;
}
}
#ifndef PRISM_EXCLUDE_SERIALIZATION
/******************************************************************************/
/* Serializing the AST */
/******************************************************************************/
/**
* Dump the AST corresponding to the given input to a string.
*/
static VALUE
dump_input(pm_string_t *input, const pm_options_t *options) {
pm_buffer_t buffer;
if (!pm_buffer_init(&buffer)) {
rb_raise(rb_eNoMemError, "failed to allocate memory");
}
pm_parser_t parser;
pm_parser_init(&parser, pm_string_source(input), pm_string_length(input), options);
pm_node_t *node = pm_parse(&parser);
pm_serialize(&parser, node, &buffer);
VALUE result = rb_str_new(pm_buffer_value(&buffer), pm_buffer_length(&buffer));
pm_node_destroy(&parser, node);
pm_buffer_free(&buffer);
pm_parser_free(&parser);
return result;
}
/**
* call-seq:
* Prism::dump(source, **options) -> String
*
* Dump the AST corresponding to the given string to a string. For supported
* options, see Prism::parse.
*/
static VALUE
dump(int argc, VALUE *argv, VALUE self) {
pm_string_t input;
pm_options_t options = { 0 };
string_options(argc, argv, &input, &options);
#ifdef PRISM_BUILD_DEBUG
size_t length = pm_string_length(&input);
char* dup = xmalloc(length);
memcpy(dup, pm_string_source(&input), length);
pm_string_constant_init(&input, dup, length);
#endif
VALUE value = dump_input(&input, &options);
#ifdef PRISM_BUILD_DEBUG
xfree(dup);
#endif
pm_string_free(&input);
pm_options_free(&options);
return value;
}
/**
* call-seq:
* Prism::dump_file(filepath, **options) -> String
*
* Dump the AST corresponding to the given file to a string. For supported
* options, see Prism::parse.
*/
static VALUE
dump_file(int argc, VALUE *argv, VALUE self) {
pm_string_t input;
pm_options_t options = { 0 };
VALUE encoded_filepath;
file_options(argc, argv, &input, &options, &encoded_filepath);
VALUE value = dump_input(&input, &options);
pm_string_free(&input);
pm_options_free(&options);
return value;
}
#endif
/******************************************************************************/
/* Extracting values for the parse result */
/******************************************************************************/
/**
* Extract the comments out of the parser into an array.
*/
static VALUE
parser_comments(pm_parser_t *parser, VALUE source) {
VALUE comments = rb_ary_new_capa(parser->comment_list.size);
for (pm_comment_t *comment = (pm_comment_t *) parser->comment_list.head; comment != NULL; comment = (pm_comment_t *) comment->node.next) {
VALUE location_argv[] = {
source,
LONG2FIX(comment->location.start - parser->start),
LONG2FIX(comment->location.end - comment->location.start)
};
VALUE type = (comment->type == PM_COMMENT_EMBDOC) ? rb_cPrismEmbDocComment : rb_cPrismInlineComment;
VALUE comment_argv[] = { rb_class_new_instance(3, location_argv, rb_cPrismLocation) };
rb_ary_push(comments, rb_class_new_instance(1, comment_argv, type));
}
return comments;
}
/**
* Extract the magic comments out of the parser into an array.
*/
static VALUE
parser_magic_comments(pm_parser_t *parser, VALUE source) {
VALUE magic_comments = rb_ary_new_capa(parser->magic_comment_list.size);
for (pm_magic_comment_t *magic_comment = (pm_magic_comment_t *) parser->magic_comment_list.head; magic_comment != NULL; magic_comment = (pm_magic_comment_t *) magic_comment->node.next) {
VALUE key_loc_argv[] = {
source,
LONG2FIX(magic_comment->key_start - parser->start),
LONG2FIX(magic_comment->key_length)
};
VALUE value_loc_argv[] = {
source,
LONG2FIX(magic_comment->value_start - parser->start),
LONG2FIX(magic_comment->value_length)
};
VALUE magic_comment_argv[] = {
rb_class_new_instance(3, key_loc_argv, rb_cPrismLocation),
rb_class_new_instance(3, value_loc_argv, rb_cPrismLocation)
};
rb_ary_push(magic_comments, rb_class_new_instance(2, magic_comment_argv, rb_cPrismMagicComment));
}
return magic_comments;
}
/**
* Extract out the data location from the parser into a Location instance if one
* exists.
*/
static VALUE
parser_data_loc(const pm_parser_t *parser, VALUE source) {
if (parser->data_loc.end == NULL) {
return Qnil;
} else {
VALUE argv[] = {
source,
LONG2FIX(parser->data_loc.start - parser->start),
LONG2FIX(parser->data_loc.end - parser->data_loc.start)
};
return rb_class_new_instance(3, argv, rb_cPrismLocation);
}
}
/**
* Extract the errors out of the parser into an array.
*/
static VALUE
parser_errors(pm_parser_t *parser, rb_encoding *encoding, VALUE source) {
VALUE errors = rb_ary_new_capa(parser->error_list.size);
pm_diagnostic_t *error;
for (error = (pm_diagnostic_t *) parser->error_list.head; error != NULL; error = (pm_diagnostic_t *) error->node.next) {
VALUE location_argv[] = {
source,
LONG2FIX(error->location.start - parser->start),
LONG2FIX(error->location.end - error->location.start)
};
VALUE level = Qnil;
switch (error->level) {
case PM_ERROR_LEVEL_SYNTAX:
level = ID2SYM(rb_intern("syntax"));
break;
case PM_ERROR_LEVEL_ARGUMENT:
level = ID2SYM(rb_intern("argument"));
break;
case PM_ERROR_LEVEL_LOAD:
level = ID2SYM(rb_intern("load"));
break;
default:
rb_raise(rb_eRuntimeError, "Unknown level: %" PRIu8, error->level);
}
VALUE error_argv[] = {
ID2SYM(rb_intern(pm_diagnostic_id_human(error->diag_id))),
rb_enc_str_new_cstr(error->message, encoding),
rb_class_new_instance(3, location_argv, rb_cPrismLocation),
level
};
rb_ary_push(errors, rb_class_new_instance(4, error_argv, rb_cPrismParseError));
}
return errors;
}
/**
* Extract the warnings out of the parser into an array.
*/
static VALUE
parser_warnings(pm_parser_t *parser, rb_encoding *encoding, VALUE source) {
VALUE warnings = rb_ary_new_capa(parser->warning_list.size);
pm_diagnostic_t *warning;
for (warning = (pm_diagnostic_t *) parser->warning_list.head; warning != NULL; warning = (pm_diagnostic_t *) warning->node.next) {
VALUE location_argv[] = {
source,
LONG2FIX(warning->location.start - parser->start),
LONG2FIX(warning->location.end - warning->location.start)
};
VALUE level = Qnil;
switch (warning->level) {
case PM_WARNING_LEVEL_DEFAULT:
level = ID2SYM(rb_intern("default"));
break;
case PM_WARNING_LEVEL_VERBOSE:
level = ID2SYM(rb_intern("verbose"));
break;
default:
rb_raise(rb_eRuntimeError, "Unknown level: %" PRIu8, warning->level);
}
VALUE warning_argv[] = {
ID2SYM(rb_intern(pm_diagnostic_id_human(warning->diag_id))),
rb_enc_str_new_cstr(warning->message, encoding),
rb_class_new_instance(3, location_argv, rb_cPrismLocation),
level
};
rb_ary_push(warnings, rb_class_new_instance(4, warning_argv, rb_cPrismParseWarning));
}
return warnings;
}
/**
* Create a new parse result from the given parser, value, encoding, and source.
*/
static VALUE
parse_result_create(VALUE class, pm_parser_t *parser, VALUE value, rb_encoding *encoding, VALUE source) {
VALUE result_argv[] = {
value,
parser_comments(parser, source),
parser_magic_comments(parser, source),
parser_data_loc(parser, source),
parser_errors(parser, encoding, source),
parser_warnings(parser, encoding, source),
source
};
return rb_class_new_instance(7, result_argv, class);
}
/******************************************************************************/
/* Lexing Ruby code */
/******************************************************************************/
/**
* This struct gets stored in the parser and passed in to the lex callback any
* time a new token is found. We use it to store the necessary information to
* initialize a Token instance.
*/
typedef struct {
VALUE source;
VALUE tokens;
rb_encoding *encoding;
} parse_lex_data_t;
/**
* This is passed as a callback to the parser. It gets called every time a new
* token is found. Once found, we initialize a new instance of Token and push it
* onto the tokens array.
*/
static void
parse_lex_token(void *data, pm_parser_t *parser, pm_token_t *token) {
parse_lex_data_t *parse_lex_data = (parse_lex_data_t *) parser->lex_callback->data;
VALUE yields = rb_assoc_new(
pm_token_new(parser, token, parse_lex_data->encoding, parse_lex_data->source),
INT2FIX(parser->lex_state)
);
rb_ary_push(parse_lex_data->tokens, yields);
}
/**
* This is called whenever the encoding changes based on the magic comment at
* the top of the file. We use it to update the encoding that we are using to
* create tokens.
*/
static void
parse_lex_encoding_changed_callback(pm_parser_t *parser) {
parse_lex_data_t *parse_lex_data = (parse_lex_data_t *) parser->lex_callback->data;
parse_lex_data->encoding = rb_enc_find(parser->encoding->name);
// Since the encoding changed, we need to go back and change the encoding of
// the tokens that were already lexed. This is only going to end up being
// one or two tokens, since the encoding can only change at the top of the
// file.
VALUE tokens = parse_lex_data->tokens;
for (long index = 0; index < RARRAY_LEN(tokens); index++) {
VALUE yields = rb_ary_entry(tokens, index);
VALUE token = rb_ary_entry(yields, 0);
VALUE value = rb_ivar_get(token, rb_intern("@value"));
rb_enc_associate(value, parse_lex_data->encoding);
ENC_CODERANGE_CLEAR(value);
}
}
/**
* Parse the given input and return a ParseResult containing just the tokens or
* the nodes and tokens.
*/
static VALUE
parse_lex_input(pm_string_t *input, const pm_options_t *options, bool return_nodes) {
pm_parser_t parser;
pm_parser_init(&parser, pm_string_source(input), pm_string_length(input), options);
pm_parser_register_encoding_changed_callback(&parser, parse_lex_encoding_changed_callback);
VALUE source_string = rb_str_new((const char *) pm_string_source(input), pm_string_length(input));
VALUE offsets = rb_ary_new_capa(parser.newline_list.size);
VALUE source = rb_funcall(rb_cPrismSource, rb_id_source_for, 3, source_string, LONG2NUM(parser.start_line), offsets);
parse_lex_data_t parse_lex_data = {
.source = source,
.tokens = rb_ary_new(),
.encoding = rb_utf8_encoding()
};
parse_lex_data_t *data = &parse_lex_data;
pm_lex_callback_t lex_callback = (pm_lex_callback_t) {
.data = (void *) data,
.callback = parse_lex_token,
};
parser.lex_callback = &lex_callback;
pm_node_t *node = pm_parse(&parser);
// Here we need to update the Source object to have the correct
// encoding for the source string and the correct newline offsets.
// We do it here because we've already created the Source object and given
// it over to all of the tokens, and both of these are only set after pm_parse().
rb_encoding *encoding = rb_enc_find(parser.encoding->name);
rb_enc_associate(source_string, encoding);
for (size_t index = 0; index < parser.newline_list.size; index++) {
rb_ary_push(offsets, ULONG2NUM(parser.newline_list.offsets[index]));
}
VALUE result;
if (return_nodes) {
VALUE value = rb_ary_new_capa(2);
rb_ary_push(value, pm_ast_new(&parser, node, parse_lex_data.encoding, source));
rb_ary_push(value, parse_lex_data.tokens);
result = parse_result_create(rb_cPrismParseLexResult, &parser, value, parse_lex_data.encoding, source);
} else {
result = parse_result_create(rb_cPrismLexResult, &parser, parse_lex_data.tokens, parse_lex_data.encoding, source);
}
pm_node_destroy(&parser, node);
pm_parser_free(&parser);
return result;
}
/**
* call-seq:
* Prism::lex(source, **options) -> LexResult
*
* Return a LexResult instance that contains an array of Token instances
* corresponding to the given string. For supported options, see Prism::parse.
*/
static VALUE
lex(int argc, VALUE *argv, VALUE self) {
pm_string_t input;
pm_options_t options = { 0 };
string_options(argc, argv, &input, &options);
VALUE result = parse_lex_input(&input, &options, false);
pm_string_free(&input);
pm_options_free(&options);
return result;
}
/**
* call-seq:
* Prism::lex_file(filepath, **options) -> LexResult
*
* Return a LexResult instance that contains an array of Token instances
* corresponding to the given file. For supported options, see Prism::parse.
*/
static VALUE
lex_file(int argc, VALUE *argv, VALUE self) {
pm_string_t input;
pm_options_t options = { 0 };
VALUE encoded_filepath;
file_options(argc, argv, &input, &options, &encoded_filepath);
VALUE value = parse_lex_input(&input, &options, false);
pm_string_free(&input);
pm_options_free(&options);
return value;
}
/******************************************************************************/
/* Parsing Ruby code */
/******************************************************************************/
/**
* Parse the given input and return a ParseResult instance.
*/
static VALUE
parse_input(pm_string_t *input, const pm_options_t *options) {
pm_parser_t parser;
pm_parser_init(&parser, pm_string_source(input), pm_string_length(input), options);
pm_node_t *node = pm_parse(&parser);
rb_encoding *encoding = rb_enc_find(parser.encoding->name);
VALUE source = pm_source_new(&parser, encoding);
VALUE value = pm_ast_new(&parser, node, encoding, source);
VALUE result = parse_result_create(rb_cPrismParseResult, &parser, value, encoding, source) ;
pm_node_destroy(&parser, node);
pm_parser_free(&parser);
return result;
}
/**
* call-seq:
* Prism::parse(source, **options) -> ParseResult
*
* Parse the given string and return a ParseResult instance. The options that
* are supported are:
*
* * `command_line` - either nil or a string of the various options that were
* set on the command line. Valid values are combinations of "a", "l",
* "n", "p", and "x".
* * `encoding` - the encoding of the source being parsed. This should be an
* encoding or nil.
* * `filepath` - the filepath of the source being parsed. This should be a
* string or nil.
* * `frozen_string_literal` - whether or not the frozen string literal pragma
* has been set. This should be a boolean or nil.
* * `line` - the line number that the parse starts on. This should be an
* integer or nil. Note that this is 1-indexed.
* * `main_script` - a boolean indicating whether or not the source being parsed
* is the main script being run by the interpreter. This controls whether
* or not shebangs are parsed for additional flags and whether or not the
* parser will attempt to find a matching shebang if the first one does
* not contain the word "ruby".
* * `partial_script` - when the file being parsed is considered a "partial"
* script, jumps will not be marked as errors if they are not contained
* within loops/blocks. This is used in the case that you're parsing a
* script that you know will be embedded inside another script later, but
* you do not have that context yet. For example, when parsing an ERB
* template that will be evaluated inside another script.
* * `scopes` - the locals that are in scope surrounding the code that is being
* parsed. This should be an array of arrays of symbols or nil. Scopes are
* ordered from the outermost scope to the innermost one.
* * `version` - the version of Ruby syntax that prism should used to parse Ruby
* code. By default prism assumes you want to parse with the latest version
* of Ruby syntax (which you can trigger with `nil` or `"latest"`). You
* may also restrict the syntax to a specific version of Ruby, e.g., with `"3.3.0"`.
* To parse with the same syntax version that the current Ruby is running
* use `version: RUBY_VERSION`. Raises ArgumentError if the version is not
* currently supported by Prism.
*/
static VALUE
parse(int argc, VALUE *argv, VALUE self) {
pm_string_t input;
pm_options_t options = { 0 };
string_options(argc, argv, &input, &options);
#ifdef PRISM_BUILD_DEBUG
size_t length = pm_string_length(&input);
char* dup = xmalloc(length);
memcpy(dup, pm_string_source(&input), length);
pm_string_constant_init(&input, dup, length);
#endif
VALUE value = parse_input(&input, &options);
#ifdef PRISM_BUILD_DEBUG
xfree(dup);
#endif
pm_string_free(&input);
pm_options_free(&options);
return value;
}
/**
* call-seq:
* Prism::parse_file(filepath, **options) -> ParseResult
*
* Parse the given file and return a ParseResult instance. For supported
* options, see Prism::parse.
*/
static VALUE
parse_file(int argc, VALUE *argv, VALUE self) {
pm_string_t input;
pm_options_t options = { 0 };
VALUE encoded_filepath;
file_options(argc, argv, &input, &options, &encoded_filepath);
VALUE value = parse_input(&input, &options);
pm_string_free(&input);
pm_options_free(&options);
return value;
}
/**
* Parse the given input and return nothing.
*/
static void
profile_input(pm_string_t *input, const pm_options_t *options) {
pm_parser_t parser;
pm_parser_init(&parser, pm_string_source(input), pm_string_length(input), options);
pm_node_t *node = pm_parse(&parser);
pm_node_destroy(&parser, node);
pm_parser_free(&parser);
}
/**
* call-seq:
* Prism::profile(source, **options) -> nil
*
* Parse the given string and return nothing. This method is meant to allow
* profilers to avoid the overhead of reifying the AST to Ruby. For supported
* options, see Prism::parse.
*/
static VALUE
profile(int argc, VALUE *argv, VALUE self) {
pm_string_t input;
pm_options_t options = { 0 };
string_options(argc, argv, &input, &options);
profile_input(&input, &options);
pm_string_free(&input);
pm_options_free(&options);
return Qnil;
}
/**
* call-seq:
* Prism::profile_file(filepath, **options) -> nil
*
* Parse the given file and return nothing. This method is meant to allow
* profilers to avoid the overhead of reifying the AST to Ruby. For supported
* options, see Prism::parse.
*/
static VALUE
profile_file(int argc, VALUE *argv, VALUE self) {
pm_string_t input;
pm_options_t options = { 0 };
VALUE encoded_filepath;
file_options(argc, argv, &input, &options, &encoded_filepath);
profile_input(&input, &options);
pm_string_free(&input);
pm_options_free(&options);
return Qnil;
}
/**
* An implementation of fgets that is suitable for use with Ruby IO objects.
*/
static char *
parse_stream_fgets(char *string, int size, void *stream) {
RUBY_ASSERT(size > 0);
VALUE line = rb_funcall((VALUE) stream, rb_intern("gets"), 1, INT2FIX(size - 1));
if (NIL_P(line)) {
return NULL;
}
const char *cstr = RSTRING_PTR(line);
long length = RSTRING_LEN(line);
memcpy(string, cstr, length);
string[length] = '\0';
return string;
}
/**
* call-seq:
* Prism::parse_stream(stream, **options) -> ParseResult
*
* Parse the given object that responds to `gets` and return a ParseResult
* instance. The options that are supported are the same as Prism::parse.
*/
static VALUE
parse_stream(int argc, VALUE *argv, VALUE self) {
VALUE stream;
VALUE keywords;
rb_scan_args(argc, argv, "1:", &stream, &keywords);
pm_options_t options = { 0 };
extract_options(&options, Qnil, keywords);
pm_parser_t parser;
pm_buffer_t buffer;
pm_node_t *node = pm_parse_stream(&parser, &buffer, (void *) stream, parse_stream_fgets, &options);
rb_encoding *encoding = rb_enc_find(parser.encoding->name);
VALUE source = pm_source_new(&parser, encoding);
VALUE value = pm_ast_new(&parser, node, encoding, source);
VALUE result = parse_result_create(rb_cPrismParseResult, &parser, value, encoding, source);
pm_node_destroy(&parser, node);
pm_buffer_free(&buffer);
pm_parser_free(&parser);
return result;
}
/**
* Parse the given input and return an array of Comment objects.
*/
static VALUE
parse_input_comments(pm_string_t *input, const pm_options_t *options) {
pm_parser_t parser;
pm_parser_init(&parser, pm_string_source(input), pm_string_length(input), options);
pm_node_t *node = pm_parse(&parser);
rb_encoding *encoding = rb_enc_find(parser.encoding->name);
VALUE source = pm_source_new(&parser, encoding);
VALUE comments = parser_comments(&parser, source);
pm_node_destroy(&parser, node);
pm_parser_free(&parser);
return comments;
}
/**
* call-seq:
* Prism::parse_comments(source, **options) -> Array
*
* Parse the given string and return an array of Comment objects. For supported
* options, see Prism::parse.
*/
static VALUE
parse_comments(int argc, VALUE *argv, VALUE self) {
pm_string_t input;
pm_options_t options = { 0 };
string_options(argc, argv, &input, &options);
VALUE result = parse_input_comments(&input, &options);
pm_string_free(&input);
pm_options_free(&options);
return result;
}
/**
* call-seq:
* Prism::parse_file_comments(filepath, **options) -> Array
*
* Parse the given file and return an array of Comment objects. For supported
* options, see Prism::parse.
*/
static VALUE
parse_file_comments(int argc, VALUE *argv, VALUE self) {
pm_string_t input;
pm_options_t options = { 0 };
VALUE encoded_filepath;
file_options(argc, argv, &input, &options, &encoded_filepath);
VALUE value = parse_input_comments(&input, &options);
pm_string_free(&input);
pm_options_free(&options);
return value;
}
/**
* call-seq:
* Prism::parse_lex(source, **options) -> ParseLexResult
*
* Parse the given string and return a ParseLexResult instance that contains a
* 2-element array, where the first element is the AST and the second element is
* an array of Token instances.
*
* This API is only meant to be used in the case where you need both the AST and
* the tokens. If you only need one or the other, use either Prism::parse or
* Prism::lex.
*
* For supported options, see Prism::parse.
*/
static VALUE
parse_lex(int argc, VALUE *argv, VALUE self) {
pm_string_t input;
pm_options_t options = { 0 };
string_options(argc, argv, &input, &options);
VALUE value = parse_lex_input(&input, &options, true);
pm_string_free(&input);
pm_options_free(&options);
return value;
}
/**
* call-seq:
* Prism::parse_lex_file(filepath, **options) -> ParseLexResult
*
* Parse the given file and return a ParseLexResult instance that contains a
* 2-element array, where the first element is the AST and the second element is
* an array of Token instances.
*
* This API is only meant to be used in the case where you need both the AST and
* the tokens. If you only need one or the other, use either Prism::parse_file
* or Prism::lex_file.
*
* For supported options, see Prism::parse.
*/
static VALUE
parse_lex_file(int argc, VALUE *argv, VALUE self) {
pm_string_t input;
pm_options_t options = { 0 };
VALUE encoded_filepath;
file_options(argc, argv, &input, &options, &encoded_filepath);
VALUE value = parse_lex_input(&input, &options, true);
pm_string_free(&input);
pm_options_free(&options);
return value;
}
/**
* Parse the given input and return true if it parses without errors.
*/
static VALUE
parse_input_success_p(pm_string_t *input, const pm_options_t *options) {
pm_parser_t parser;
pm_parser_init(&parser, pm_string_source(input), pm_string_length(input), options);
pm_node_t *node = pm_parse(&parser);
pm_node_destroy(&parser, node);
VALUE result = parser.error_list.size == 0 ? Qtrue : Qfalse;
pm_parser_free(&parser);
return result;
}
/**
* call-seq:
* Prism::parse_success?(source, **options) -> bool
*
* Parse the given string and return true if it parses without errors. For
* supported options, see Prism::parse.
*/
static VALUE
parse_success_p(int argc, VALUE *argv, VALUE self) {
pm_string_t input;
pm_options_t options = { 0 };
string_options(argc, argv, &input, &options);
VALUE result = parse_input_success_p(&input, &options);
pm_string_free(&input);
pm_options_free(&options);
return result;
}
/**
* call-seq:
* Prism::parse_failure?(source, **options) -> bool
*
* Parse the given string and return true if it parses with errors. For
* supported options, see Prism::parse.
*/
static VALUE
parse_failure_p(int argc, VALUE *argv, VALUE self) {
return RTEST(parse_success_p(argc, argv, self)) ? Qfalse : Qtrue;
}
/**
* call-seq:
* Prism::parse_file_success?(filepath, **options) -> bool
*
* Parse the given file and return true if it parses without errors. For
* supported options, see Prism::parse.
*/
static VALUE
parse_file_success_p(int argc, VALUE *argv, VALUE self) {
pm_string_t input;
pm_options_t options = { 0 };
VALUE encoded_filepath;
file_options(argc, argv, &input, &options, &encoded_filepath);
VALUE result = parse_input_success_p(&input, &options);
pm_string_free(&input);
pm_options_free(&options);
return result;
}
/**
* call-seq:
* Prism::parse_file_failure?(filepath, **options) -> bool
*
* Parse the given file and return true if it parses with errors. For
* supported options, see Prism::parse.
*/
static VALUE
parse_file_failure_p(int argc, VALUE *argv, VALUE self) {
return RTEST(parse_file_success_p(argc, argv, self)) ? Qfalse : Qtrue;
}
/******************************************************************************/
/* Initialization of the extension */
/******************************************************************************/
/**
* The init function that Ruby calls when loading this extension.
*/
RUBY_FUNC_EXPORTED void
Init_prism(void) {
// Make sure that the prism library version matches the expected version.
// Otherwise something was compiled incorrectly.
if (strcmp(pm_version(), EXPECTED_PRISM_VERSION) != 0) {
rb_raise(
rb_eRuntimeError,
"The prism library version (%s) does not match the expected version (%s)",
pm_version(),
EXPECTED_PRISM_VERSION
);
}
// Grab up references to all of the constants that we're going to need to
// reference throughout this extension.
rb_cPrism = rb_define_module("Prism");
rb_cPrismNode = rb_define_class_under(rb_cPrism, "Node", rb_cObject);
rb_cPrismSource = rb_define_class_under(rb_cPrism, "Source", rb_cObject);
rb_cPrismToken = rb_define_class_under(rb_cPrism, "Token", rb_cObject);
rb_cPrismLocation = rb_define_class_under(rb_cPrism, "Location", rb_cObject);
rb_cPrismComment = rb_define_class_under(rb_cPrism, "Comment", rb_cObject);
rb_cPrismInlineComment = rb_define_class_under(rb_cPrism, "InlineComment", rb_cPrismComment);
rb_cPrismEmbDocComment = rb_define_class_under(rb_cPrism, "EmbDocComment", rb_cPrismComment);
rb_cPrismMagicComment = rb_define_class_under(rb_cPrism, "MagicComment", rb_cObject);
rb_cPrismParseError = rb_define_class_under(rb_cPrism, "ParseError", rb_cObject);
rb_cPrismParseWarning = rb_define_class_under(rb_cPrism, "ParseWarning", rb_cObject);
rb_cPrismResult = rb_define_class_under(rb_cPrism, "Result", rb_cObject);
rb_cPrismParseResult = rb_define_class_under(rb_cPrism, "ParseResult", rb_cPrismResult);
rb_cPrismLexResult = rb_define_class_under(rb_cPrism, "LexResult", rb_cPrismResult);
rb_cPrismParseLexResult = rb_define_class_under(rb_cPrism, "ParseLexResult", rb_cPrismResult);
// Intern all of the IDs eagerly that we support so that we don't have to do
// it every time we parse.
rb_id_option_command_line = rb_intern_const("command_line");
rb_id_option_encoding = rb_intern_const("encoding");
rb_id_option_filepath = rb_intern_const("filepath");
rb_id_option_frozen_string_literal = rb_intern_const("frozen_string_literal");
rb_id_option_line = rb_intern_const("line");
rb_id_option_main_script = rb_intern_const("main_script");
rb_id_option_partial_script = rb_intern_const("partial_script");
rb_id_option_scopes = rb_intern_const("scopes");
rb_id_option_version = rb_intern_const("version");
rb_id_source_for = rb_intern("for");
/**
* The version of the prism library.
*/
rb_define_const(rb_cPrism, "VERSION", rb_str_new2(EXPECTED_PRISM_VERSION));
// First, the functions that have to do with lexing and parsing.
rb_define_singleton_method(rb_cPrism, "lex", lex, -1);
rb_define_singleton_method(rb_cPrism, "lex_file", lex_file, -1);
rb_define_singleton_method(rb_cPrism, "parse", parse, -1);
rb_define_singleton_method(rb_cPrism, "parse_file", parse_file, -1);
rb_define_singleton_method(rb_cPrism, "profile", profile, -1);
rb_define_singleton_method(rb_cPrism, "profile_file", profile_file, -1);
rb_define_singleton_method(rb_cPrism, "parse_stream", parse_stream, -1);
rb_define_singleton_method(rb_cPrism, "parse_comments", parse_comments, -1);
rb_define_singleton_method(rb_cPrism, "parse_file_comments", parse_file_comments, -1);
rb_define_singleton_method(rb_cPrism, "parse_lex", parse_lex, -1);
rb_define_singleton_method(rb_cPrism, "parse_lex_file", parse_lex_file, -1);
rb_define_singleton_method(rb_cPrism, "parse_success?", parse_success_p, -1);
rb_define_singleton_method(rb_cPrism, "parse_failure?", parse_failure_p, -1);
rb_define_singleton_method(rb_cPrism, "parse_file_success?", parse_file_success_p, -1);
rb_define_singleton_method(rb_cPrism, "parse_file_failure?", parse_file_failure_p, -1);
#ifndef PRISM_EXCLUDE_SERIALIZATION
rb_define_singleton_method(rb_cPrism, "dump", dump, -1);
rb_define_singleton_method(rb_cPrism, "dump_file", dump_file, -1);
#endif
// Next, initialize the other APIs.
Init_prism_api_node();
Init_prism_pack();
}
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