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898 lines
26 KiB
V
898 lines
26 KiB
V
// Copyright (c) 2021 Lars Pontoppidan. All rights reserved.
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// Use of this source code is governed by an MIT license
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// that can be found in the LICENSE file.
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module parser
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import toml.ast
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import toml.checker
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import toml.util
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import toml.token
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import toml.scanner
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// Parser contains the necessary fields for keeping the state of the parsing process.
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pub struct Parser {
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pub:
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config Config
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mut:
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scanner &scanner.Scanner
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prev_tok token.Token
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tok token.Token
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peek_tok token.Token
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skip_next bool
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// The root map (map is called table in TOML world)
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root_map map[string]ast.Value
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root_map_key string
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// Array of Tables state
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last_aot string
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last_aot_index int
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// Root of the tree
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ast_root &ast.Root = &ast.Root{}
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}
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// Config is used to configure a Parser instance.
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// `run_checks` is used to en- or disable running of the strict `checker.Checker` type checks.
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pub struct Config {
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pub:
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scanner &scanner.Scanner
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run_checks bool = true
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}
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// new_parser returns a new, stack allocated, `Parser`.
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pub fn new_parser(config Config) Parser {
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return Parser{
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config: config
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scanner: config.scanner
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}
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}
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// init initializes the parser.
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pub fn (mut p Parser) init() ? {
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p.root_map = map[string]ast.Value{}
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p.next() ?
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}
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// run_checker validates the parsed `ast.Value` nodes in the
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// the generated AST.
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fn (mut p Parser) run_checker() ? {
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if p.config.run_checks {
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chckr := checker.Checker{
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scanner: p.scanner
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}
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chckr.check(p.root_map) ?
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for comment in p.ast_root.comments {
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chckr.check_comment(comment) ?
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}
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}
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}
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// parse starts parsing the input and returns the root
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// of the generated AST.
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pub fn (mut p Parser) parse() ?&ast.Root {
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p.init() ?
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p.root_table() ?
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p.run_checker() ?
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p.ast_root.table = p.root_map
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return p.ast_root
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}
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// next forwards the parser to the next token.
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fn (mut p Parser) next() ? {
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p.prev_tok = p.tok
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p.tok = p.peek_tok
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p.peek_tok = p.scanner.scan() ?
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}
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// check returns true if the current token's `Kind` is equal that of `expected_token`.
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fn (mut p Parser) check(check_token token.Kind) ? {
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if p.tok.kind == check_token {
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p.next() ?
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} else {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' expected token "$check_token" but found "$p.tok.kind" in this (excerpt): "...${p.excerpt()}..."')
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}
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}
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// check_one_of returns true if the current token's `Kind` is equal that of `expected_token`.
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fn (mut p Parser) check_one_of(tokens []token.Kind) ? {
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if p.tok.kind in tokens {
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p.next() ?
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} else {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' expected one of $tokens but found "$p.tok.kind" in this (excerpt): "...${p.excerpt()}..."')
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}
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}
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// is_at returns true if the token kind is equal to `expected_token`.
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fn (mut p Parser) is_at(expected_token token.Kind) bool {
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return p.tok.kind == expected_token
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}
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// expect will error if the token kind is not equal to `expected_token`.
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fn (mut p Parser) expect(expected_token token.Kind) ? {
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if p.tok.kind == expected_token {
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return
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} else {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' expected token "$expected_token" but found "$p.tok.kind" in this text "...${p.excerpt()}..."')
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}
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}
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// find_table returns a reference to a map if found in the *root* table given a "dotted" key (`a.b.c`).
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// If some segments of the key does not exist in the root table find_table will
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// allocate a new map for each segment. This behavior is needed because you can
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// reference maps by multiple keys "dotted" (separated by "." periods) in TOML documents.
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// See also `find_in_table`.
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pub fn (mut p Parser) find_table() ?&map[string]ast.Value {
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util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'locating "$p.root_map_key" in map ${ptr_str(p.root_map)}')
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mut t := &map[string]ast.Value{}
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unsafe {
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t = &p.root_map
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}
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if p.root_map_key == '' {
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return t
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}
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return p.find_in_table(mut t, p.root_map_key)
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}
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// sub_table_key returns the logic parts of a dotted key (`a.b.c`) for
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// use with the `find_sub_table` method.
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pub fn (mut p Parser) sub_table_key(key string) (string, string) {
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mut ks := key.split('.')
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last := ks.last()
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ks.delete_last()
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return ks.join('.'), last
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}
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// find_sub_table returns a reference to a map if found in the *root* table given a "dotted" key (`a.b.c`).
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// If some segments of the key does not exist in the input map find_sub_table will
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// allocate a new map for the segment. This behavior is needed because you can
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// reference maps by multiple keys "dotted" (separated by "." periods) in TOML documents.
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// See also `find_in_table`.
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pub fn (mut p Parser) find_sub_table(key string) ?&map[string]ast.Value {
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mut ky := p.root_map_key + '.' + key
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if p.root_map_key == '' {
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ky = key
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}
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util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'locating "$ky" in map ${ptr_str(p.root_map)}')
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mut t := &map[string]ast.Value{}
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unsafe {
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t = &p.root_map
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}
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if ky == '' {
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return t
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}
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return p.find_in_table(mut t, ky)
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}
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// find_in_table returns a reference to a map if found in `table` given a "dotted" key (`a.b.c`).
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// If some segments of the key does not exist in the input map find_in_table will
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// allocate a new map for the segment. This behavior is needed because you can
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// reference maps by multiple keys "dotted" (separated by "." periods) in TOML documents.
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pub fn (mut p Parser) find_in_table(mut table map[string]ast.Value, key string) ?&map[string]ast.Value {
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// NOTE This code is the result of much trial and error.
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// I'm still not quite sure *exactly* why it works. All I can leave here is a hope
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// that this kind of minefield someday will be easier in V :)
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util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'locating "$key" in map ${ptr_str(table)}')
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mut t := &map[string]ast.Value{}
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unsafe {
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t = &table
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}
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ks := key.split('.')
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unsafe {
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for k in ks {
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if k in t.keys() {
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util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'found key "$k" in $t.keys()')
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if val := t[k] or {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' this should never happen. Key "$k" was checked before access')
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}
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{
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if val is map[string]ast.Value {
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// unsafe {
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t = &(t[k] as map[string]ast.Value)
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//}
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} else {
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return error(@MOD + '.' + @STRUCT + '.' + @FN + ' "$k" is not a map')
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}
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}
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} else {
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util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'no key "$k" found, allocating new map "$k" in map ${ptr_str(t)}"')
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// unsafe {
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t[k] = map[string]ast.Value{}
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t = &(t[k] as map[string]ast.Value)
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util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'allocated new map ${ptr_str(t)}"')
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//}
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}
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}
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}
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util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'returning map ${ptr_str(t)}"')
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return t
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}
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// sub_key parses next tokens as sub/nested keys. This is the also referred to as
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// a "dotted" key (`a.b.c`). sub_key returns a string in dotted form.
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pub fn (mut p Parser) sub_key() ?string {
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util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'parsing nested key...')
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key := p.key() ?
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mut text := key.str()
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for p.peek_tok.kind == .period {
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p.next() ? // .
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p.check(.period) ?
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next_key := p.key() ?
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text += '.' + next_key.text
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}
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p.next() ?
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util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'parsed nested key `$text` now at "$p.tok.kind" "$p.tok.lit"')
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return text
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}
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// root_table parses next tokens into the root map of `ast.Value`s.
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// The V `map` type is corresponding to a "table" in TOML.
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pub fn (mut p Parser) root_table() ? {
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util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'parsing root table...')
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for p.tok.kind != .eof {
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if !p.skip_next {
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p.next() ?
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} else {
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p.skip_next = false
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}
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util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'parsing token "$p.tok.kind" "$p.tok.lit"')
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match p.tok.kind {
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.hash {
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c := p.comment()
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p.ast_root.comments << c
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util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'skipping comment "$c.text"')
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}
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//.whitespace, .tab, .nl {
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// util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'skipping "$p.tok.kind "$p.tok.lit"')
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//}
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.bare, .quoted, .boolean, .number, .underscore { // NOTE .boolean allows for use of "true" and "false" as table keys
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if p.peek_tok.kind == .assign
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|| (p.tok.kind == .number && p.peek_tok.kind == .minus) {
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key, val := p.key_value() ?
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t := p.find_table() ?
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unsafe {
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util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'setting "$key.str()" = $val.to_json() in table ${ptr_str(t)}')
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t[key.str()] = val
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}
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} else if p.peek_tok.kind == .period {
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subkey := p.sub_key() ?
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p.check(.assign) ?
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val := p.value() ?
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sub_table, key := p.sub_table_key(subkey)
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t := p.find_sub_table(sub_table) ?
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unsafe {
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util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'setting "$key" = $val.to_json() in table ${ptr_str(t)}')
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t[key] = val
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}
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} else {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' dead end at "$p.tok.kind" "$p.tok.lit"')
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}
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}
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.lsbr {
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p.check(.lsbr) ? // '[' bracket
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if p.tok.kind == .lsbr {
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p.array_of_tables(mut &p.root_map) ?
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p.skip_next = true // skip calling p.next() in coming iteration
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util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'leaving double bracket at "$p.tok.kind "$p.tok.lit". NEXT is "$p.peek_tok.kind "$p.peek_tok.lit"')
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} else if p.peek_tok.kind == .period {
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p.root_map_key = p.sub_key() ?
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util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'setting root map key to `$p.root_map_key` at "$p.tok.kind" "$p.tok.lit"')
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p.expect(.rsbr) ?
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} else {
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key := p.key() ?
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p.root_map_key = key.str()
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util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'setting root map key to `$p.root_map_key` at "$p.tok.kind" "$p.tok.lit"')
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p.next() ?
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p.expect(.rsbr) ?
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}
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}
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.eof {
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return
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}
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else {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' could not parse "$p.tok.kind" "$p.tok.lit" in this (excerpt): "...${p.excerpt()}..."')
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}
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}
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}
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}
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// excerpt returns a string of the characters surrounding `Parser.tok.pos`
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fn (p Parser) excerpt() string {
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return p.scanner.excerpt(p.tok.pos, 10)
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}
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// inline_table parses next tokens into a map of `ast.Value`s.
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// The V map type is corresponding to a "table" in TOML.
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pub fn (mut p Parser) inline_table(mut tbl map[string]ast.Value) ? {
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util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'parsing inline table into ${ptr_str(tbl)}...')
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mut previous_token_was_value := false
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for p.tok.kind != .eof {
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p.next() ?
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util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'parsing token "$p.tok.kind"')
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if previous_token_was_value {
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if p.tok.kind != .rcbr {
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p.expect(.comma) ?
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}
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previous_token_was_value = false
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}
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match p.tok.kind {
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//.whitespace, .tab, .nl {
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// util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'skipping "$p.tok.kind "$p.tok.lit"')
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//}
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.comma {
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if p.peek_tok.kind == .rcbr {
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p.next() ? // Forward to the peek_tok
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' unexpected "$p.tok.kind" "$p.tok.lit" at this (excerpt): "...${p.excerpt()}..."')
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}
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if p.peek_tok.kind == .comma {
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p.next() ? // Forward to the peek_tok
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' unexpected "$p.tok.kind" "$p.tok.lit" at this (excerpt): "...${p.excerpt()}..."')
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}
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util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'skipping comma table value seperator "$p.tok.lit"')
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continue
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}
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.rcbr {
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// '}' bracket
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return
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}
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.bare, .quoted, .boolean, .number, .underscore {
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if p.peek_tok.kind == .assign {
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key, val := p.key_value() ?
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util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'inserting @5 "$key.str()" = $val.to_json() into ${ptr_str(tbl)}')
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tbl[key.str()] = val
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} else if p.peek_tok.kind == .period {
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subkey := p.sub_key() ?
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p.check(.assign) ?
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val := p.value() ?
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sub_table, key := p.sub_table_key(subkey)
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mut t := p.find_in_table(mut tbl, sub_table) ?
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unsafe {
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util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'inserting @6 "$key" = $val.to_json() into ${ptr_str(t)}')
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t[key] = val
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}
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} else {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' dead end at "$p.tok.kind" "$p.tok.lit"')
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}
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previous_token_was_value = true
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}
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else {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' unexpected "$p.tok.kind" "$p.tok.lit" at this (excerpt): "...${p.excerpt()}..."')
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}
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}
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}
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// Make sure the inline-table actually use the return at .rcbr match branch.
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' unexpected end of inline-table "$p.tok.kind" "$p.tok.lit" at this (excerpt): "...${p.excerpt()}..."')
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}
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// array_of_tables parses next tokens into an array of `ast.Value`s.
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pub fn (mut p Parser) array_of_tables(mut table map[string]ast.Value) ? {
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util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'parsing array of tables "$p.tok.kind" "$p.tok.lit"')
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// NOTE this is starting to get ugly. TOML isn't simple at this point
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p.check(.lsbr) ? // '[' bracket
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// [[key.key]] horror
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if p.peek_tok.kind == .period {
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p.double_array_of_tables(mut table) ?
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return
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}
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key := p.key() ?
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p.next() ?
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p.check(.rsbr) ?
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p.check(.rsbr) ?
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key_str := key.str()
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unsafe {
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if key_str in table.keys() {
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if val := table[key_str] or {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' this should never happen. Key "$key_str" was checked before access')
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}
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{
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if val is []ast.Value {
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arr := &(table[key_str] as []ast.Value)
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arr << p.double_bracket_array() ?
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table[key_str] = arr
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} else {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' table[$key_str] is not an array. (excerpt): "...${p.excerpt()}..."')
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}
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}
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} else {
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table[key_str] = p.double_bracket_array() ?
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}
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}
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p.last_aot = key_str
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p.last_aot_index = 0
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}
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// double_array_of_tables parses next tokens into an array of tables of arrays of `ast.Value`s...
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pub fn (mut p Parser) double_array_of_tables(mut table map[string]ast.Value) ? {
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util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'parsing array of tables of arrays "$p.tok.kind" "$p.tok.lit"')
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key := p.key() ?
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mut key_str := key.str()
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for p.peek_tok.kind == .period {
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p.next() ? // .
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p.check(.period) ?
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next_key := p.key() ?
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key_str += '.' + next_key.text
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}
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p.next() ?
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|
p.check(.rsbr) ?
|
|
p.check(.rsbr) ?
|
|
|
|
ks := key_str.split('.')
|
|
|
|
if ks.len != 2 {
|
|
return error(@MOD + '.' + @STRUCT + '.' + @FN +
|
|
' nested array of tables does not support more than 2 levels. (excerpt): "...${p.excerpt()}..."')
|
|
}
|
|
|
|
first := ks[0]
|
|
last := ks[1]
|
|
|
|
unsafe {
|
|
// NOTE this is starting to get EVEN uglier. TOML is not at all simple at this point...
|
|
if p.last_aot != first {
|
|
table[first] = []ast.Value{}
|
|
p.last_aot = first
|
|
mut t_arr := &(table[p.last_aot] as []ast.Value)
|
|
t_arr << map[string]ast.Value{}
|
|
p.last_aot_index = 0
|
|
}
|
|
|
|
mut t_arr := &(table[p.last_aot] as []ast.Value)
|
|
mut t_map := t_arr[p.last_aot_index]
|
|
mut t := &(t_map as map[string]ast.Value)
|
|
|
|
if last in t.keys() {
|
|
if val := t[last] or {
|
|
return error(@MOD + '.' + @STRUCT + '.' + @FN +
|
|
' this should never happen. Key "$last" was checked before access')
|
|
}
|
|
{
|
|
if val is []ast.Value {
|
|
arr := &(val as []ast.Value)
|
|
arr << p.double_bracket_array() ?
|
|
t[last] = arr
|
|
} else {
|
|
return error(@MOD + '.' + @STRUCT + '.' + @FN +
|
|
' t[$last] is not an array. (excerpt): "...${p.excerpt()}..."')
|
|
}
|
|
}
|
|
} else {
|
|
t[last] = p.double_bracket_array() ?
|
|
}
|
|
}
|
|
}
|
|
|
|
// array parses next tokens into an array of `ast.Value`s.
|
|
pub fn (mut p Parser) double_bracket_array() ?[]ast.Value {
|
|
mut arr := []ast.Value{}
|
|
for p.tok.kind in [.bare, .quoted, .boolean, .number] && p.peek_tok.kind == .assign {
|
|
mut tbl := map[string]ast.Value{}
|
|
key, val := p.key_value() ?
|
|
tbl[key.str()] = val
|
|
arr << tbl
|
|
p.next() ?
|
|
}
|
|
return arr
|
|
}
|
|
|
|
// array parses next tokens into an array of `ast.Value`s.
|
|
pub fn (mut p Parser) array() ?[]ast.Value {
|
|
util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'parsing array...')
|
|
mut arr := []ast.Value{}
|
|
p.expect(.lsbr) ? // '[' bracket
|
|
mut previous_token_was_value := false
|
|
for p.tok.kind != .eof {
|
|
p.next() ?
|
|
util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'parsing token "$p.tok.kind" "$p.tok.lit"')
|
|
|
|
if previous_token_was_value {
|
|
if p.tok.kind != .rsbr && p.tok.kind != .hash {
|
|
p.expect(.comma) ?
|
|
}
|
|
previous_token_was_value = false
|
|
}
|
|
|
|
match p.tok.kind {
|
|
.boolean {
|
|
arr << ast.Value(p.boolean() ?)
|
|
previous_token_was_value = true
|
|
}
|
|
.comma {
|
|
// Trailing commas before array close is allowed
|
|
// so we skip `if p.peek_tok.kind == .rsbr { ... }`
|
|
if p.peek_tok.kind == .comma {
|
|
p.next() ? // Forward to the peek_tok
|
|
return error(@MOD + '.' + @STRUCT + '.' + @FN +
|
|
' unexpected "$p.tok.kind" "$p.tok.lit" at this (excerpt): "...${p.excerpt()}..."')
|
|
}
|
|
util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'skipping comma table value seperator "$p.tok.lit"')
|
|
continue
|
|
}
|
|
.eof {
|
|
return error(@MOD + '.' + @STRUCT + '.' + @FN +
|
|
' could not parse array. Reached EOF "$p.tok.kind" "$p.tok.lit" ("$p.tok.lit") in this (excerpt): "...${p.excerpt()}..."')
|
|
}
|
|
.hash {
|
|
c := p.comment()
|
|
p.ast_root.comments << c
|
|
util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'skipping comment "$c.text"')
|
|
}
|
|
.lcbr {
|
|
mut t := map[string]ast.Value{}
|
|
p.inline_table(mut t) ?
|
|
arr << ast.Value(t)
|
|
previous_token_was_value = true
|
|
}
|
|
.number {
|
|
val := p.number_or_date() ?
|
|
arr << val
|
|
previous_token_was_value = true
|
|
}
|
|
.quoted {
|
|
arr << ast.Value(p.quoted())
|
|
previous_token_was_value = true
|
|
}
|
|
.lsbr {
|
|
util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'parsing array in array "$p.tok.kind" "$p.tok.lit"')
|
|
arr << ast.Value(p.array() ?)
|
|
previous_token_was_value = true
|
|
}
|
|
.rsbr {
|
|
break
|
|
}
|
|
else {
|
|
error(@MOD + '.' + @STRUCT + '.' + @FN +
|
|
' could not parse "$p.tok.kind" "$p.tok.lit" ("$p.tok.lit") in this (excerpt): "...${p.excerpt()}..."')
|
|
}
|
|
}
|
|
}
|
|
p.expect(.rsbr) ? // ']' bracket
|
|
$if debug {
|
|
flat := arr.str().replace('\n', r'\n')
|
|
util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'parsed array: $flat . Currently @ token "$p.tok.kind"')
|
|
}
|
|
return arr
|
|
}
|
|
|
|
// comment returns an `ast.Comment` type.
|
|
pub fn (mut p Parser) comment() ast.Comment {
|
|
util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'parsed hash comment "#$p.tok.lit"')
|
|
return ast.Comment{
|
|
text: p.tok.lit
|
|
pos: p.tok.position()
|
|
}
|
|
}
|
|
|
|
// key parse and returns an `ast.Key` type.
|
|
// Keys are the token(s) appearing before an assignment operator (=).
|
|
pub fn (mut p Parser) key() ?ast.Key {
|
|
util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'parsing key from "$p.tok.lit" ...')
|
|
|
|
mut key := ast.Key(ast.Null{})
|
|
if p.tok.kind == .number {
|
|
if p.peek_tok.kind == .minus {
|
|
mut lits := p.tok.lit
|
|
pos := p.tok.position()
|
|
for p.peek_tok.kind != .assign {
|
|
p.next() ?
|
|
lits += p.tok.lit
|
|
}
|
|
return ast.Key(ast.Bare{
|
|
text: lits
|
|
pos: pos
|
|
})
|
|
}
|
|
// number := p.number() as ast.Number
|
|
key = ast.Key(p.number())
|
|
} else {
|
|
key = match p.tok.kind {
|
|
.bare, .underscore {
|
|
ast.Key(p.bare())
|
|
}
|
|
.boolean {
|
|
ast.Key(p.boolean() ?)
|
|
}
|
|
.quoted {
|
|
ast.Key(p.quoted())
|
|
}
|
|
else {
|
|
error(@MOD + '.' + @STRUCT + '.' + @FN +
|
|
' key expected .bare, .number, .quoted or .boolean but got "$p.tok.kind"')
|
|
ast.Key(ast.Bare{}) // TODO workaround bug
|
|
}
|
|
}
|
|
}
|
|
|
|
// NOTE kept for eased debugging
|
|
// util.printdbg(@MOD +'.' + @STRUCT + '.' + @FN, 'parsed key "$p.tok.lit"')
|
|
// panic(@MOD + '.' + @STRUCT + '.' + @FN + ' could not parse ${p.tok.kind} ("${p.tok.lit}") token \n$p.tok')
|
|
// return ast.Key(ast.Bare{})
|
|
|
|
return key
|
|
}
|
|
|
|
// key_value parse and returns a pair `ast.Key` and `ast.Value` type.
|
|
// see also `key()` and `value()`
|
|
pub fn (mut p Parser) key_value() ?(ast.Key, ast.Value) {
|
|
util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'parsing key value pair...')
|
|
key := p.key() ?
|
|
p.next() ?
|
|
p.check(.assign) ? // Assignment operator
|
|
value := p.value() ?
|
|
util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'parsed key value pair. "$key" = $value.to_json()')
|
|
return key, value
|
|
}
|
|
|
|
// value parse and returns an `ast.Value` type.
|
|
// values are the token(s) appearing after an assignment operator (=).
|
|
pub fn (mut p Parser) value() ?ast.Value {
|
|
util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'parsing value...')
|
|
// println('parsed comment "${p.tok.lit}"')
|
|
|
|
mut value := ast.Value(ast.Null{})
|
|
|
|
util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'parsing token "$p.tok.kind" "$p.tok.lit"')
|
|
// mut value := ast.Value{}
|
|
if p.tok.kind == .number {
|
|
number_or_date := p.number_or_date() ?
|
|
value = number_or_date
|
|
} else {
|
|
value = match p.tok.kind {
|
|
.quoted {
|
|
ast.Value(p.quoted())
|
|
}
|
|
.boolean {
|
|
ast.Value(p.boolean() ?)
|
|
}
|
|
.lsbr {
|
|
ast.Value(p.array() ?)
|
|
}
|
|
.lcbr {
|
|
mut t := map[string]ast.Value{}
|
|
p.inline_table(mut t) ?
|
|
// table[key_str] = ast.Value(t)
|
|
ast.Value(t)
|
|
}
|
|
else {
|
|
ast.Value(ast.Null{})
|
|
}
|
|
}
|
|
if value is ast.Null {
|
|
return error(@MOD + '.' + @STRUCT + '.' + @FN +
|
|
' value expected .boolean, .quoted, .lsbr, .lcbr or .number got "$p.tok.kind" "$p.tok.lit"')
|
|
}
|
|
}
|
|
util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'parsed "$p.tok.kind" as value $value.to_json()')
|
|
return value
|
|
}
|
|
|
|
// number_or_date parse and returns an `ast.Value` type as
|
|
// one of [`ast.Date`, `ast.Time`, `ast.DateTime`, `ast.Number`]
|
|
pub fn (mut p Parser) number_or_date() ?ast.Value {
|
|
// Handle Date/Time
|
|
if p.peek_tok.kind == .minus || p.peek_tok.kind == .colon {
|
|
date_time_type := p.date_time() ?
|
|
match date_time_type {
|
|
ast.Date {
|
|
return ast.Value(date_time_type as ast.Date)
|
|
}
|
|
ast.Time {
|
|
return ast.Value(date_time_type as ast.Time)
|
|
}
|
|
ast.DateTime {
|
|
return ast.Value(date_time_type as ast.DateTime)
|
|
}
|
|
}
|
|
}
|
|
return ast.Value(p.number())
|
|
}
|
|
|
|
// bare parse and returns an `ast.Bare` type.
|
|
pub fn (mut p Parser) bare() ast.Bare {
|
|
return ast.Bare{
|
|
text: p.tok.lit
|
|
pos: p.tok.position()
|
|
}
|
|
}
|
|
|
|
// quoted parse and returns an `ast.Quoted` type.
|
|
pub fn (mut p Parser) quoted() ast.Quoted {
|
|
// To get more info about the quote type and enable better checking,
|
|
// the scanner is returning the literal *with* single- or double-quotes.
|
|
mut quote := p.tok.lit[0]
|
|
is_multiline := p.tok.lit.len >= 6 && p.tok.lit[1] == quote && p.tok.lit[2] == quote
|
|
mut lit := p.tok.lit[1..p.tok.lit.len - 1]
|
|
if is_multiline {
|
|
lit = p.tok.lit[3..p.tok.lit.len - 3]
|
|
}
|
|
return ast.Quoted{
|
|
text: lit
|
|
pos: p.tok.position()
|
|
quote: quote
|
|
is_multiline: is_multiline
|
|
}
|
|
}
|
|
|
|
// boolean parse and returns an `ast.Bool` type.
|
|
pub fn (mut p Parser) boolean() ?ast.Bool {
|
|
if p.tok.lit !in ['true', 'false'] {
|
|
return error(@MOD + '.' + @STRUCT + '.' + @FN +
|
|
' expected literal to be either `true` or `false` got "$p.tok.kind"')
|
|
}
|
|
return ast.Bool{
|
|
text: p.tok.lit
|
|
pos: p.tok.position()
|
|
}
|
|
}
|
|
|
|
// number parse and returns an `ast.Number` type.
|
|
pub fn (mut p Parser) number() ast.Number {
|
|
return ast.Number{
|
|
text: p.tok.lit
|
|
pos: p.tok.position()
|
|
}
|
|
}
|
|
|
|
// date_time parses dates and time in RFC 3339 format.
|
|
// https://datatracker.ietf.org/doc/html/rfc3339
|
|
pub fn (mut p Parser) date_time() ?ast.DateTimeType {
|
|
// Date and/or Time
|
|
mut lit := ''
|
|
pos := p.tok.position()
|
|
mut date := ast.Date{}
|
|
mut time := ast.Time{}
|
|
|
|
if p.peek_tok.kind == .minus {
|
|
date = p.date() ?
|
|
lit += date.text
|
|
// Look for any THH:MM:SS or <space>HH:MM:SS
|
|
if (p.peek_tok.kind == .bare && (p.peek_tok.lit.starts_with('T')
|
|
|| p.peek_tok.lit.starts_with('t'))) || p.peek_tok.kind == .whitespace {
|
|
p.next() ? // Advance to token with Txx or whitespace special case
|
|
if p.tok.lit.starts_with('T') || p.tok.lit.starts_with('t') {
|
|
lit += p.tok.lit[0].ascii_str() //'T' or 't'
|
|
} else {
|
|
lit += p.tok.lit
|
|
p.next() ?
|
|
}
|
|
time = p.time() ?
|
|
lit += time.text
|
|
|
|
util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'parsed date-time: "$lit"')
|
|
return ast.DateTime{
|
|
text: lit
|
|
pos: pos
|
|
date: date
|
|
time: time
|
|
}
|
|
}
|
|
} else if p.peek_tok.kind == .colon {
|
|
time = p.time() ?
|
|
return time
|
|
}
|
|
|
|
return ast.Date{
|
|
text: lit
|
|
pos: pos
|
|
}
|
|
}
|
|
|
|
// date parse and returns an `ast.Date` type.
|
|
pub fn (mut p Parser) date() ?ast.Date {
|
|
// Date
|
|
mut lit := p.tok.lit
|
|
pos := p.tok.position()
|
|
|
|
p.check(.number) ?
|
|
lit += p.tok.lit
|
|
p.check(.minus) ?
|
|
lit += p.tok.lit
|
|
p.check(.number) ?
|
|
lit += p.tok.lit
|
|
p.check(.minus) ?
|
|
lit += p.tok.lit
|
|
p.expect(.number) ?
|
|
|
|
util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'parsed date: "$lit"')
|
|
return ast.Date{
|
|
text: lit
|
|
pos: pos
|
|
}
|
|
}
|
|
|
|
// time parse and returns an `ast.Time` type.
|
|
pub fn (mut p Parser) time() ?ast.Time {
|
|
// Time
|
|
mut lit := p.tok.lit
|
|
pos := p.tok.position()
|
|
|
|
if p.is_at(.bare) && (lit.starts_with('T') || lit.starts_with('t')) {
|
|
if p.tok.lit.starts_with('T') {
|
|
lit = lit.all_after('T')
|
|
} else if p.tok.lit.starts_with('t') {
|
|
lit = lit.all_after('t')
|
|
}
|
|
p.next() ?
|
|
} else {
|
|
p.check(.number) ?
|
|
}
|
|
lit += p.tok.lit
|
|
p.check(.colon) ?
|
|
lit += p.tok.lit
|
|
p.check(.number) ?
|
|
lit += p.tok.lit
|
|
// TODO does TOML even have optional seconds?
|
|
// if p.peek_tok.kind == .colon {
|
|
p.check(.colon) ?
|
|
lit += p.tok.lit
|
|
p.expect(.number) ?
|
|
//}
|
|
|
|
// Optional milliseconds
|
|
if p.peek_tok.kind == .period {
|
|
p.next() ?
|
|
lit += p.tok.lit // lit += '.'
|
|
p.check(.period) ?
|
|
lit += p.tok.lit
|
|
p.expect(.number) ?
|
|
}
|
|
|
|
// Parse offset
|
|
if p.peek_tok.kind == .minus || p.peek_tok.kind == .plus {
|
|
p.next() ?
|
|
lit += p.tok.lit // lit += '-'
|
|
p.check_one_of([.minus, .plus]) ?
|
|
lit += p.tok.lit
|
|
p.check(.number) ?
|
|
lit += p.tok.lit
|
|
p.check(.colon) ?
|
|
lit += p.tok.lit
|
|
p.expect(.number) ?
|
|
} else if p.peek_tok.kind == .bare && (p.peek_tok.lit == 'Z' || p.peek_tok.lit == 'z') {
|
|
p.next() ?
|
|
lit += p.tok.lit
|
|
p.expect(.bare) ?
|
|
}
|
|
|
|
util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, 'parsed time: "$lit"')
|
|
return ast.Time{
|
|
text: lit
|
|
pos: pos
|
|
}
|
|
}
|
|
|
|
// eof returns an `ast.EOF` type.
|
|
pub fn (mut p Parser) eof() ast.EOF {
|
|
return ast.EOF{
|
|
pos: p.tok.position()
|
|
}
|
|
}
|