878 lines
18 KiB
V
878 lines
18 KiB
V
// Copyright (c) 2019 Alexander Medvednikov. 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 compiler
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import (
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os
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strings
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)
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const (
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single_quote = `\'`
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double_quote = `"`
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error_context_before = 2 // how many lines of source context to print before the pointer line
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error_context_after = 2 // ^^^ same, but after
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)
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struct Scanner {
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mut:
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file_path string
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text string
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pos int
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line_nr int
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last_nl_pos int // for calculating column
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inside_string bool
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inter_start bool // for hacky string interpolation TODO simplify
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inter_end bool
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debug bool
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line_comment string
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started bool
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// vfmt fields
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fmt_out strings.Builder
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fmt_indent int
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fmt_line_empty bool
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prev_tok TokenKind
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fn_name string // needed for @FN
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should_print_line_on_error bool
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should_print_errors_in_color bool
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should_print_relative_paths_on_error bool
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quote byte // which quote is used to denote current string: ' or "
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line_ends []int // the positions of source lines ends (i.e. \n signs)
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nlines int // total number of lines in the source file that were scanned
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is_vh bool // Keep newlines
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is_fmt bool // Used only for skipping ${} in strings, since we need literal
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// string values when generating formatted code.
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}
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// new scanner from file.
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fn new_scanner_file(file_path string) &Scanner {
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if !os.file_exists(file_path) {
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verror("$file_path doesn't exist")
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}
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mut raw_text := os.read_file(file_path) or {
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verror('scanner: failed to open $file_path')
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return 0
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}
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// BOM check
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if raw_text.len >= 3 {
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c_text := raw_text.str
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if c_text[0] == 0xEF && c_text[1] == 0xBB && c_text[2] == 0xBF {
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// skip three BOM bytes
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offset_from_begin := 3
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raw_text = tos(c_text[offset_from_begin], vstrlen(c_text) - offset_from_begin)
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}
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}
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mut s := new_scanner(raw_text)
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s.init_fmt()
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s.file_path = file_path
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return s
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}
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// new scanner from string.
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fn new_scanner(text string) &Scanner {
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return &Scanner {
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text: text
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fmt_out: strings.new_builder(1000)
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should_print_line_on_error: true
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should_print_errors_in_color: true
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should_print_relative_paths_on_error: true
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}
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}
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// TODO remove once multiple return values are implemented
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struct ScanRes {
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tok TokenKind
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lit string
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}
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fn scan_res(tok TokenKind, lit string) ScanRes {
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return ScanRes{tok, lit}
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}
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fn (s mut Scanner) ident_name() string {
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start := s.pos
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for {
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s.pos++
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if s.pos >= s.text.len {
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break
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}
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c := s.text[s.pos]
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if !is_name_char(c) && !c.is_digit() {
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break
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}
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}
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name := s.text[start..s.pos]
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s.pos--
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return name
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}
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fn (s mut Scanner) ident_hex_number() string {
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start_pos := s.pos
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s.pos += 2 // skip '0x'
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for {
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if s.pos >= s.text.len {
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break
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}
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c := s.text[s.pos]
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if !c.is_hex_digit() {
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break
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}
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s.pos++
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}
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number := s.text[start_pos..s.pos]
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s.pos--
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return number
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}
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fn (s mut Scanner) ident_oct_number() string {
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start_pos := s.pos
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for {
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if s.pos >= s.text.len {
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break
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}
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c := s.text[s.pos]
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if c.is_digit() {
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if !c.is_oct_digit() {
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s.error('malformed octal constant')
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}
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} else {
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break
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}
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s.pos++
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}
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number := s.text[start_pos..s.pos]
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s.pos--
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return number
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}
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fn (s mut Scanner) ident_dec_number() string {
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start_pos := s.pos
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// scan integer part
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for s.pos < s.text.len && s.text[s.pos].is_digit() {
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s.pos++
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}
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// e.g. 1..9
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// we just return '1' and don't scan '..9'
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if s.expect('..', s.pos) {
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number := s.text[start_pos..s.pos]
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s.pos--
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return number
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}
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// scan fractional part
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if s.pos < s.text.len && s.text[s.pos] == `.` {
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s.pos++
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for s.pos < s.text.len && s.text[s.pos].is_digit() {
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s.pos++
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}
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if !s.inside_string && s.pos < s.text.len && s.text[s.pos] == `f` {
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s.error('no `f` is needed for floats')
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}
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}
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// scan exponential part
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mut has_exponential_part := false
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if s.expect('e+', s.pos) || s.expect('e-', s.pos) {
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exp_start_pos := s.pos += 2
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for s.pos < s.text.len && s.text[s.pos].is_digit() {
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s.pos++
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}
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if exp_start_pos == s.pos {
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s.error('exponent has no digits')
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}
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has_exponential_part = true
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}
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// error check: 1.23.4, 123.e+3.4
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if s.pos < s.text.len && s.text[s.pos] == `.` {
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if has_exponential_part {
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s.error('exponential part should be integer')
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}
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else {
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s.error('too many decimal points in number')
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}
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}
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number := s.text[start_pos..s.pos]
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s.pos--
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return number
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}
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fn (s mut Scanner) ident_number() string {
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if s.expect('0x', s.pos) {
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return s.ident_hex_number()
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}
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if s.expect('0.', s.pos) || s.expect('0e', s.pos) {
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return s.ident_dec_number()
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}
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if s.text[s.pos] == `0` {
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return s.ident_oct_number()
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}
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return s.ident_dec_number()
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}
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fn (s mut Scanner) skip_whitespace() {
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//if s.is_vh { println('vh') return }
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for s.pos < s.text.len && s.text[s.pos].is_white() {
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if is_nl(s.text[s.pos]) && s.is_vh {
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return
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}
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// Count \r\n as one line
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if is_nl(s.text[s.pos]) && !s.expect('\r\n', s.pos-1) {
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s.inc_line_number()
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}
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s.pos++
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}
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}
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fn (s mut Scanner) end_of_file() ScanRes {
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s.pos = s.text.len
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s.inc_line_number()
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return scan_res(.eof, '')
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}
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fn (s mut Scanner) scan() ScanRes {
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//if s.line_comment != '' {
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//s.fgenln('// LC "$s.line_comment"')
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//s.line_comment = ''
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//}
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if s.started {
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s.pos++
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}
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s.started = true
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if s.pos >= s.text.len {
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return s.end_of_file()
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}
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if !s.inside_string {
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s.skip_whitespace()
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}
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// End of $var, start next string
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if s.inter_end {
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if s.text[s.pos] == s.quote {
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s.inter_end = false
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return scan_res(.str, '')
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}
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s.inter_end = false
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return scan_res(.str, s.ident_string())
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}
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s.skip_whitespace()
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// end of file
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if s.pos >= s.text.len {
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return s.end_of_file()
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}
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// handle each char
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c := s.text[s.pos]
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mut nextc := `\0`
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if s.pos + 1 < s.text.len {
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nextc = s.text[s.pos + 1]
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}
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// name or keyword
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if is_name_char(c) {
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name := s.ident_name()
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// tmp hack to detect . in ${}
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// Check if not .eof to prevent panic
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next_char := if s.pos + 1 < s.text.len { s.text[s.pos + 1] } else { `\0` }
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if is_key(name) {
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return scan_res(key_to_token(name), '')
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}
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// 'asdf $b' => "b" is the last name in the string, dont start parsing string
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// at the next ', skip it
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if s.inside_string {
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if next_char == s.quote {
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s.inter_end = true
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s.inter_start = false
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s.inside_string = false
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}
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}
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if s.inter_start && next_char != `.` {
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s.inter_end = true
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s.inter_start = false
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}
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if s.pos == 0 && next_char == ` ` {
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s.pos++
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//If a single letter name at the start of the file, increment
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//Otherwise the scanner would be stuck at s.pos = 0
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}
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return scan_res(.name, name)
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}
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// `123`, `.123`
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else if c.is_digit() || (c == `.` && nextc.is_digit()) {
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num := s.ident_number()
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return scan_res(.number, num)
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}
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// all other tokens
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match c {
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`+` {
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if nextc == `+` {
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s.pos++
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return scan_res(.inc, '')
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}
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else if nextc == `=` {
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s.pos++
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return scan_res(.plus_assign, '')
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}
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return scan_res(.plus, '')
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}
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`-` {
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if nextc == `-` {
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s.pos++
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return scan_res(.dec, '')
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}
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else if nextc == `=` {
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s.pos++
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return scan_res(.minus_assign, '')
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}
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return scan_res(.minus, '')
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}
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`*` {
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if nextc == `=` {
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s.pos++
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return scan_res(.mult_assign, '')
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}
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return scan_res(.mul, '')
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}
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`^` {
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if nextc == `=` {
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s.pos++
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return scan_res(.xor_assign, '')
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}
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return scan_res(.xor, '')
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}
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`%` {
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if nextc == `=` {
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s.pos++
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return scan_res(.mod_assign, '')
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}
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return scan_res(.mod, '')
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}
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`?` {
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return scan_res(.question, '')
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}
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single_quote, double_quote {
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return scan_res(.str, s.ident_string())
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}
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`\`` { // ` // apostrophe balance comment. do not remove
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return scan_res(.chartoken, s.ident_char())
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}
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`(` {
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return scan_res(.lpar, '')
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}
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`)` {
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return scan_res(.rpar, '')
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}
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`[` {
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return scan_res(.lsbr, '')
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}
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`]` {
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return scan_res(.rsbr, '')
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}
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`{` {
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// Skip { in ${ in strings
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// }
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if s.inside_string {
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return s.scan()
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}
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return scan_res(.lcbr, '')
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}
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`$` {
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return scan_res(.dollar, '')
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}
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`}` {
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// s = `hello $name !`
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// s = `hello ${name} !`
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if s.inside_string {
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s.pos++
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// TODO UNNEEDED?
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if s.text[s.pos] == single_quote {
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s.inside_string = false
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return scan_res(.str, '')
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}
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return scan_res(.str, s.ident_string())
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}
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else {
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return scan_res(.rcbr, '')
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}
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}
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`&` {
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if nextc == `=` {
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s.pos++
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return scan_res(.and_assign, '')
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}
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if nextc == `&` {
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s.pos++
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return scan_res(.and, '')
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}
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return scan_res(.amp, '')
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}
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`|` {
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if nextc == `|` {
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s.pos++
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return scan_res(.logical_or, '')
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}
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if nextc == `=` {
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s.pos++
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return scan_res(.or_assign, '')
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}
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return scan_res(.pipe, '')
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}
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`,` {
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return scan_res(.comma, '')
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}
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`@` {
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s.pos++
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name := s.ident_name()
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// @FN => will be substituted with the name of the current V function
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// @FILE => will be substituted with the path of the V source file
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// @LINE => will be substituted with the V line number where it appears (as a string).
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// @COLUMN => will be substituted with the column where it appears (as a string).
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// @VHASH => will be substituted with the shortened commit hash of the V compiler (as a string).
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// This allows things like this:
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// println( 'file: ' + @FILE + ' | line: ' + @LINE + ' | fn: ' + @FN)
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// ... which is useful while debugging/tracing
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if name == 'FN' { return scan_res(.str, s.fn_name) }
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if name == 'FILE' { return scan_res(.str, cescaped_path(os.realpath(s.file_path))) }
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if name == 'LINE' { return scan_res(.str, (s.line_nr+1).str()) }
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if name == 'COLUMN' { return scan_res(.str, (s.current_column()).str()) }
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if name == 'VHASH' { return scan_res(.str, vhash()) }
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if !is_key(name) {
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s.error('@ must be used before keywords (e.g. `@type string`)')
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}
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return scan_res(.name, name)
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}
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/*
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case `\r`:
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if nextc == `\n` {
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s.pos++
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s.last_nl_pos = s.pos
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return scan_res(.nl, '')
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}
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}
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case `\n`:
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s.last_nl_pos = s.pos
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return scan_res(.nl, '')
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}
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*/
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`.` {
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if nextc == `.` {
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s.pos++
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if s.text[s.pos+1] == `.` {
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s.pos++
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return scan_res(.ellipsis, '')
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}
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return scan_res(.dotdot, '')
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}
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return scan_res(.dot, '')
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}
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`#` {
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start := s.pos + 1
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s.ignore_line()
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if nextc == `!` {
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// treat shebang line (#!) as a comment
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s.line_comment = s.text[start + 1..s.pos].trim_space()
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//s.fgenln('// shebang line "$s.line_comment"')
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return s.scan()
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}
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hash := s.text[start..s.pos]
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return scan_res(.hash, hash.trim_space())
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}
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`>` {
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if nextc == `=` {
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s.pos++
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return scan_res(.ge, '')
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}
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else if nextc == `>` {
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if s.pos + 2 < s.text.len && s.text[s.pos + 2] == `=` {
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s.pos += 2
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return scan_res(.righ_shift_assign, '')
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}
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s.pos++
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return scan_res(.righ_shift, '')
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}
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else {
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return scan_res(.gt, '')
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}
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}
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0xE2 {
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//case `≠`:
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if nextc == 0x89 && s.text[s.pos + 2] == 0xA0 {
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s.pos += 2
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return scan_res(.ne, '')
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}
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// ⩽
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else if nextc == 0x89 && s.text[s.pos + 2] == 0xBD {
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s.pos += 2
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return scan_res(.le, '')
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}
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// ⩾
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else if nextc == 0xA9 && s.text[s.pos + 2] == 0xBE {
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s.pos += 2
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return scan_res(.ge, '')
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}
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}
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`<` {
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if nextc == `=` {
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s.pos++
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return scan_res(.le, '')
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}
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else if nextc == `<` {
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if s.pos + 2 < s.text.len && s.text[s.pos + 2] == `=` {
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s.pos += 2
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return scan_res(.left_shift_assign, '')
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}
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s.pos++
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return scan_res(.left_shift, '')
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}
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else {
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return scan_res(.lt, '')
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}
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}
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`=` {
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if nextc == `=` {
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s.pos++
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return scan_res(.eq, '')
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}
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else if nextc == `>` {
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s.pos++
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return scan_res(.arrow, '')
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}
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else {
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return scan_res(.assign, '')
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}
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}
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`:` {
|
|
if nextc == `=` {
|
|
s.pos++
|
|
return scan_res(.decl_assign, '')
|
|
}
|
|
else {
|
|
return scan_res(.colon, '')
|
|
}
|
|
}
|
|
`;` {
|
|
return scan_res(.semicolon, '')
|
|
}
|
|
`!` {
|
|
if nextc == `=` {
|
|
s.pos++
|
|
return scan_res(.ne, '')
|
|
}
|
|
else {
|
|
return scan_res(.not, '')
|
|
}
|
|
}
|
|
`~` {
|
|
return scan_res(.bit_not, '')
|
|
}
|
|
`/` {
|
|
if nextc == `=` {
|
|
s.pos++
|
|
return scan_res(.div_assign, '')
|
|
}
|
|
if nextc == `/` {
|
|
start := s.pos + 1
|
|
s.ignore_line()
|
|
s.line_comment = s.text[start + 1..s.pos]
|
|
s.line_comment = s.line_comment.trim_space()
|
|
//s.fgenln('// ${s.prev_tok.str()} "$s.line_comment"')
|
|
// Skip the comment (return the next token)
|
|
return s.scan()
|
|
}
|
|
// Multiline comments
|
|
if nextc == `*` {
|
|
start := s.pos
|
|
mut nest_count := 1
|
|
// Skip comment
|
|
for nest_count > 0 {
|
|
s.pos++
|
|
if s.pos >= s.text.len {
|
|
s.line_nr--
|
|
s.error('comment not terminated')
|
|
}
|
|
if s.text[s.pos] == `\n` {
|
|
s.inc_line_number()
|
|
continue
|
|
}
|
|
if s.expect('/*', s.pos) {
|
|
nest_count++
|
|
continue
|
|
}
|
|
if s.expect('*/', s.pos) {
|
|
nest_count--
|
|
}
|
|
}
|
|
s.pos++
|
|
end := s.pos + 1
|
|
comm := s.text[start..end]
|
|
s.fgenln(comm)
|
|
// Skip if not in fmt mode
|
|
return s.scan()
|
|
}
|
|
return scan_res(.div, '')
|
|
}
|
|
}
|
|
$if windows {
|
|
if c == `\0` {
|
|
return s.end_of_file()
|
|
}
|
|
}
|
|
mut msg := 'invalid character `${c.str()}`'
|
|
if c == `"` {
|
|
msg += ', use \' to denote strings'
|
|
}
|
|
s.error(msg)
|
|
return s.end_of_file()
|
|
}
|
|
|
|
fn (s &Scanner) current_column() int {
|
|
return s.pos - s.last_nl_pos
|
|
}
|
|
|
|
fn (s Scanner) count_symbol_before(p int, sym byte) int {
|
|
mut count := 0
|
|
for i:=p; i>=0; i-- {
|
|
if s.text[i] != sym {
|
|
break
|
|
}
|
|
count++
|
|
}
|
|
return count
|
|
}
|
|
|
|
fn (s mut Scanner) ident_string() string {
|
|
q := s.text[s.pos]
|
|
is_quote := q == single_quote || q == double_quote
|
|
is_raw := is_quote && s.text[s.pos-1] == `r`
|
|
if is_quote && !s.inside_string {
|
|
s.quote = q
|
|
}
|
|
//if s.file_path.contains('string_test') {
|
|
//println('\nident_string() at char=${s.text[s.pos].str()}')
|
|
//println('linenr=$s.line_nr quote= $qquote ${qquote.str()}')
|
|
//}
|
|
mut start := s.pos
|
|
s.inside_string = false
|
|
slash := `\\`
|
|
for {
|
|
s.pos++
|
|
if s.pos >= s.text.len {
|
|
break
|
|
}
|
|
c := s.text[s.pos]
|
|
prevc := s.text[s.pos - 1]
|
|
// end of string
|
|
if c == s.quote && (prevc != slash || (prevc == slash && s.text[s.pos - 2] == slash)) {
|
|
// handle '123\\' slash at the end
|
|
break
|
|
}
|
|
if c == `\n` {
|
|
s.inc_line_number()
|
|
}
|
|
// Don't allow \0
|
|
if c == `0` && s.pos > 2 && s.text[s.pos - 1] == slash {
|
|
s.error('0 character in a string literal')
|
|
}
|
|
// Don't allow \x00
|
|
if c == `0` && s.pos > 5 && s.expect('\\x0', s.pos - 3) {
|
|
s.error('0 character in a string literal')
|
|
}
|
|
// ${var}
|
|
if c == `{` && prevc == `$` && !is_raw && !s.is_fmt && s.count_symbol_before(s.pos-2, slash) % 2 == 0 {
|
|
s.inside_string = true
|
|
// so that s.pos points to $ at the next step
|
|
s.pos -= 2
|
|
break
|
|
}
|
|
// $var
|
|
if (c.is_letter() || c == `_`) && prevc == `$` && !s.is_fmt && !is_raw && s.count_symbol_before(s.pos-2, slash) % 2 == 0 {
|
|
s.inside_string = true
|
|
s.inter_start = true
|
|
s.pos -= 2
|
|
break
|
|
}
|
|
}
|
|
mut lit := ''
|
|
if s.text[start] == s.quote {
|
|
start++
|
|
}
|
|
mut end := s.pos
|
|
if s.inside_string {
|
|
end++
|
|
}
|
|
if start > s.pos{}
|
|
else {
|
|
lit = s.text[start..end]
|
|
}
|
|
return lit
|
|
}
|
|
|
|
fn (s mut Scanner) ident_char() string {
|
|
start := s.pos
|
|
slash := `\\`
|
|
mut len := 0
|
|
for {
|
|
s.pos++
|
|
if s.pos >= s.text.len {
|
|
break
|
|
}
|
|
if s.text[s.pos] != slash {
|
|
len++
|
|
}
|
|
double_slash := s.expect('\\\\', s.pos - 2)
|
|
if s.text[s.pos] == `\`` && (s.text[s.pos - 1] != slash || double_slash) { // ` // apostrophe balance comment. do not remove
|
|
if double_slash {
|
|
len++
|
|
}
|
|
break
|
|
}
|
|
}
|
|
len--
|
|
c := s.text[start + 1..s.pos]
|
|
if len != 1 {
|
|
u := c.ustring()
|
|
if u.len != 1 {
|
|
s.error('invalid character literal (more than one character: $len)')
|
|
}
|
|
}
|
|
if c == '\\`' {
|
|
return '`'
|
|
}
|
|
// Escapes a `'` character
|
|
return if c == '\'' { '\\' + c } else { c }
|
|
}
|
|
|
|
fn (s &Scanner) expect(want string, start_pos int) bool {
|
|
end_pos := start_pos + want.len
|
|
if start_pos < 0 || start_pos >= s.text.len {
|
|
return false
|
|
}
|
|
if end_pos < 0 || end_pos > s.text.len {
|
|
return false
|
|
}
|
|
for pos in start_pos..end_pos {
|
|
if s.text[pos] != want[pos-start_pos] {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
fn (s mut Scanner) debug_tokens() {
|
|
s.pos = 0
|
|
s.started = false
|
|
s.debug = true
|
|
|
|
fname := s.file_path.all_after(os.path_separator)
|
|
println('\n===DEBUG TOKENS $fname===')
|
|
|
|
for {
|
|
res := s.scan()
|
|
tok := res.tok
|
|
lit := res.lit
|
|
print(tok.str())
|
|
if lit != '' {
|
|
println(' `$lit`')
|
|
}
|
|
else {
|
|
println('')
|
|
}
|
|
if tok == .eof {
|
|
println('============ END OF DEBUG TOKENS ==================')
|
|
break
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
fn (s mut Scanner) ignore_line() {
|
|
s.eat_to_end_of_line()
|
|
s.inc_line_number()
|
|
}
|
|
|
|
fn (s mut Scanner) eat_to_end_of_line(){
|
|
for s.pos < s.text.len && s.text[s.pos] != `\n` {
|
|
s.pos++
|
|
}
|
|
}
|
|
|
|
fn (s mut Scanner) inc_line_number() {
|
|
s.last_nl_pos = s.pos
|
|
s.line_nr++
|
|
s.line_ends << s.pos
|
|
if s.line_nr > s.nlines {
|
|
s.nlines = s.line_nr
|
|
}
|
|
}
|
|
|
|
fn (s Scanner) line(n int) string {
|
|
mut res := ''
|
|
if n >= 0 &&
|
|
n < s.line_ends.len {
|
|
nline_start := if n == 0 { 0 } else { s.line_ends[ n - 1 ] }
|
|
nline_end := s.line_ends[n]
|
|
if nline_start <= nline_end {
|
|
res = s.text[nline_start..nline_end]
|
|
}
|
|
}
|
|
return res.trim_right('\r\n').trim_left('\r\n')
|
|
}
|
|
|
|
fn is_name_char(c byte) bool {
|
|
return c.is_letter() || c == `_`
|
|
}
|
|
|
|
[inline]
|
|
fn is_nl(c byte) bool {
|
|
return c == `\r` || c == `\n`
|
|
}
|
|
|
|
fn contains_capital(s string) bool {
|
|
for c in s {
|
|
if c >= `A` && c <= `Z` {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
// HTTPRequest bad
|
|
// HttpRequest good
|
|
fn good_type_name(s string) bool {
|
|
if s.len < 4 {
|
|
return true
|
|
}
|
|
for i in 2 .. s.len {
|
|
if s[i].is_capital() && s[i-1].is_capital() && s[i-2].is_capital() {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
// registration_date good
|
|
// registrationdate bad
|
|
fn (s &Scanner) validate_var_name(name string) {
|
|
if name.len > 11 && !name.contains('_') {
|
|
s.error('bad variable name `$name`\n' +
|
|
'looks like you have a multi-word name without separating them with `_`' +
|
|
'\nfor example, use `registration_date` instead of `registrationdate` ')
|
|
|
|
}
|
|
}
|
|
|
|
|