945 lines
20 KiB
V
945 lines
20 KiB
V
// Copyright (c) 2019-2020 Alexander Medvednikov. All rights reserved.
|
|
// Use of this source code is governed by an MIT license
|
|
// that can be found in the LICENSE file.
|
|
module compiler
|
|
|
|
import (
|
|
os
|
|
filepath
|
|
// strings
|
|
)
|
|
|
|
const (
|
|
single_quote = `\'`
|
|
double_quote = `"`
|
|
error_context_before = 2 // how many lines of source context to print before the pointer line
|
|
error_context_after = 2 // ^^^ same, but after
|
|
)
|
|
|
|
pub struct Scanner {
|
|
mut:
|
|
file_path string
|
|
text string
|
|
pos int
|
|
line_nr int
|
|
last_nl_pos int // for calculating column
|
|
inside_string bool
|
|
inter_start bool // for hacky string interpolation TODO simplify
|
|
inter_end bool
|
|
debug bool
|
|
line_comment string
|
|
started bool
|
|
// vfmt fields TODO move to a separate struct
|
|
// fmt_out strings.Builder
|
|
fmt_lines []string
|
|
// fmt_line string
|
|
fmt_indent int
|
|
fmt_line_empty bool
|
|
// fmt_needs_nl bool
|
|
prev_tok TokenKind
|
|
fn_name string // needed for @FN
|
|
print_line_on_error bool
|
|
print_colored_error bool
|
|
print_rel_paths_on_error bool
|
|
quote byte // which quote is used to denote current string: ' or "
|
|
line_ends []int // the positions of source lines ends (i.e. \n signs)
|
|
nlines int // total number of lines in the source file that were scanned
|
|
is_vh bool // Keep newlines
|
|
is_fmt bool // Used only for skipping ${} in strings, since we need literal
|
|
// string values when generating formatted code.
|
|
}
|
|
// new scanner from file.
|
|
fn new_scanner_file(file_path string) &Scanner {
|
|
if !os.exists(file_path) {
|
|
verror("$file_path doesn't exist")
|
|
}
|
|
mut raw_text := os.read_file(file_path)or{
|
|
verror('scanner: failed to open $file_path')
|
|
return 0
|
|
}
|
|
// BOM check
|
|
if raw_text.len >= 3 {
|
|
c_text := raw_text.str
|
|
if c_text[0] == 0xEF && c_text[1] == 0xBB && c_text[2] == 0xBF {
|
|
// skip three BOM bytes
|
|
offset_from_begin := 3
|
|
raw_text = tos(c_text[offset_from_begin], vstrlen(c_text) - offset_from_begin)
|
|
}
|
|
}
|
|
mut s := new_scanner(raw_text)
|
|
s.init_fmt()
|
|
s.file_path = file_path
|
|
return s
|
|
}
|
|
|
|
// new scanner from string.
|
|
fn new_scanner(text string) &Scanner {
|
|
return &Scanner{
|
|
text: text
|
|
print_line_on_error: true
|
|
print_colored_error: true
|
|
print_rel_paths_on_error: true
|
|
}
|
|
}
|
|
|
|
// TODO remove once multiple return values are implemented
|
|
struct ScanRes {
|
|
tok TokenKind
|
|
lit string
|
|
}
|
|
|
|
fn scan_res(tok TokenKind, lit string) ScanRes {
|
|
return ScanRes{
|
|
tok,lit}
|
|
}
|
|
|
|
fn (s mut Scanner) ident_name() string {
|
|
start := s.pos
|
|
for {
|
|
s.pos++
|
|
if s.pos >= s.text.len {
|
|
break
|
|
}
|
|
c := s.text[s.pos]
|
|
if !is_name_char(c) && !c.is_digit() {
|
|
break
|
|
}
|
|
}
|
|
name := s.text[start..s.pos]
|
|
s.pos--
|
|
return name
|
|
}
|
|
|
|
const(
|
|
num_sep = `_` // char used as number separator
|
|
)
|
|
|
|
fn filter_num_sep(txt byteptr, start int, end int) string {
|
|
unsafe {
|
|
mut b := malloc(end-start + 1) // add a byte for the endstring 0
|
|
mut i := start
|
|
mut i1 := 0
|
|
for i < end {
|
|
if txt[i] != num_sep {
|
|
b[i1]=txt[i]
|
|
i1++
|
|
}
|
|
i++
|
|
}
|
|
b[i1]=0 // C string compatibility
|
|
return string{b,i1}
|
|
}
|
|
}
|
|
|
|
fn (s mut Scanner) ident_bin_number() string {
|
|
start_pos := s.pos
|
|
s.pos += 2 // skip '0b'
|
|
for {
|
|
if s.pos >= s.text.len {
|
|
break
|
|
}
|
|
c := s.text[s.pos]
|
|
if !c.is_bin_digit() && c != num_sep {
|
|
break
|
|
}
|
|
s.pos++
|
|
}
|
|
number := filter_num_sep(s.text.str, start_pos, s.pos)
|
|
s.pos--
|
|
return number
|
|
}
|
|
|
|
fn (s mut Scanner) ident_hex_number() string {
|
|
start_pos := s.pos
|
|
s.pos += 2 // skip '0x'
|
|
for {
|
|
if s.pos >= s.text.len {
|
|
break
|
|
}
|
|
c := s.text[s.pos]
|
|
if !c.is_hex_digit() && c != num_sep {
|
|
break
|
|
}
|
|
s.pos++
|
|
}
|
|
number := filter_num_sep(s.text.str, start_pos, s.pos)
|
|
s.pos--
|
|
return number
|
|
}
|
|
|
|
fn (s mut Scanner) ident_oct_number() string {
|
|
start_pos := s.pos
|
|
for {
|
|
if s.pos >= s.text.len {
|
|
break
|
|
}
|
|
c := s.text[s.pos]
|
|
if c.is_digit() {
|
|
if !c.is_oct_digit() && c != num_sep {
|
|
s.error('malformed octal constant')
|
|
}
|
|
}
|
|
else {
|
|
break
|
|
}
|
|
s.pos++
|
|
}
|
|
number := filter_num_sep(s.text.str, start_pos, s.pos)
|
|
s.pos--
|
|
return number
|
|
}
|
|
|
|
fn (s mut Scanner) ident_dec_number() string {
|
|
start_pos := s.pos
|
|
// scan integer part
|
|
for s.pos < s.text.len && (s.text[s.pos].is_digit() || s.text[s.pos] == num_sep) {
|
|
s.pos++
|
|
}
|
|
// e.g. 1..9
|
|
// we just return '1' and don't scan '..9'
|
|
if s.expect('..', s.pos) {
|
|
number := filter_num_sep(s.text.str, start_pos, s.pos)
|
|
s.pos--
|
|
return number
|
|
}
|
|
// scan fractional part
|
|
if s.pos < s.text.len && s.text[s.pos] == `.` {
|
|
s.pos++
|
|
for s.pos < s.text.len && s.text[s.pos].is_digit() {
|
|
s.pos++
|
|
}
|
|
if !s.inside_string && s.pos < s.text.len && s.text[s.pos] == `f` {
|
|
s.error('no `f` is needed for floats')
|
|
}
|
|
}
|
|
// scan exponential part
|
|
mut has_exponential_part := false
|
|
if s.expect('e', s.pos) || s.expect('E', s.pos) {
|
|
exp_start_pos := (s.pos++)
|
|
|
|
if s.text[s.pos] in [`-`, `+`] {
|
|
s.pos++
|
|
}
|
|
|
|
for s.pos < s.text.len && s.text[s.pos].is_digit() {
|
|
s.pos++
|
|
}
|
|
if exp_start_pos == s.pos {
|
|
s.error('exponent has no digits')
|
|
}
|
|
has_exponential_part = true
|
|
}
|
|
// error check: 1.23.4, 123.e+3.4
|
|
if s.pos < s.text.len && s.text[s.pos] == `.` {
|
|
if has_exponential_part {
|
|
s.error('exponential part should be integer')
|
|
}
|
|
else {
|
|
s.error('too many decimal points in number')
|
|
}
|
|
}
|
|
number := filter_num_sep(s.text.str, start_pos, s.pos)
|
|
s.pos--
|
|
return number
|
|
}
|
|
|
|
fn (s mut Scanner) ident_number() string {
|
|
if s.expect('0b', s.pos) {
|
|
return s.ident_bin_number()
|
|
}
|
|
if s.expect('0x', s.pos) {
|
|
return s.ident_hex_number()
|
|
}
|
|
if s.expect('0.', s.pos) || s.expect('0e', s.pos) {
|
|
return s.ident_dec_number()
|
|
}
|
|
if s.text[s.pos] == `0` {
|
|
return s.ident_oct_number()
|
|
}
|
|
return s.ident_dec_number()
|
|
}
|
|
|
|
fn (s mut Scanner) skip_whitespace() {
|
|
// if s.is_vh { println('vh') return }
|
|
for s.pos < s.text.len && s.text[s.pos].is_white() {
|
|
if is_nl(s.text[s.pos]) && s.is_vh {
|
|
return
|
|
}
|
|
// Count \r\n as one line
|
|
if is_nl(s.text[s.pos]) && !s.expect('\r\n', s.pos - 1) {
|
|
s.inc_line_number()
|
|
}
|
|
s.pos++
|
|
}
|
|
}
|
|
|
|
fn (s mut Scanner) end_of_file() ScanRes {
|
|
s.pos = s.text.len
|
|
s.inc_line_number()
|
|
return scan_res(.eof, '')
|
|
}
|
|
|
|
fn (s mut Scanner) scan() ScanRes {
|
|
// if s.line_comment != '' {
|
|
// s.fgenln('// LC "$s.line_comment"')
|
|
// s.line_comment = ''
|
|
// }
|
|
if s.started {
|
|
s.pos++
|
|
}
|
|
s.started = true
|
|
if s.pos >= s.text.len {
|
|
return s.end_of_file()
|
|
}
|
|
if !s.inside_string {
|
|
s.skip_whitespace()
|
|
}
|
|
// End of $var, start next string
|
|
if s.inter_end {
|
|
if s.text[s.pos] == s.quote {
|
|
s.inter_end = false
|
|
return scan_res(.str, '')
|
|
}
|
|
s.inter_end = false
|
|
return scan_res(.str, s.ident_string())
|
|
}
|
|
s.skip_whitespace()
|
|
// end of file
|
|
if s.pos >= s.text.len {
|
|
return s.end_of_file()
|
|
}
|
|
// handle each char
|
|
c := s.text[s.pos]
|
|
mut nextc := `\0`
|
|
if s.pos + 1 < s.text.len {
|
|
nextc = s.text[s.pos + 1]
|
|
}
|
|
// name or keyword
|
|
if is_name_char(c) {
|
|
name := s.ident_name()
|
|
// tmp hack to detect . in ${}
|
|
// Check if not .eof to prevent panic
|
|
next_char := if s.pos + 1 < s.text.len { s.text[s.pos + 1] } else { `\0` }
|
|
if is_key(name) {
|
|
return scan_res(key_to_token(name), '')
|
|
}
|
|
// 'asdf $b' => "b" is the last name in the string, dont start parsing string
|
|
// at the next ', skip it
|
|
if s.inside_string {
|
|
if next_char == s.quote {
|
|
s.inter_end = true
|
|
s.inter_start = false
|
|
s.inside_string = false
|
|
}
|
|
}
|
|
// end of `$expr`
|
|
// allow `'$a.b'` and `'$a.c()'`
|
|
if s.inter_start && next_char != `.` && next_char != `(` {
|
|
s.inter_end = true
|
|
s.inter_start = false
|
|
}
|
|
if s.pos == 0 && next_char == ` ` {
|
|
// If a single letter name at the start of the file, increment
|
|
// Otherwise the scanner would be stuck at s.pos = 0
|
|
s.pos++
|
|
}
|
|
return scan_res(.name, name)
|
|
}
|
|
// `123`, `.123`
|
|
else if c.is_digit() || (c == `.` && nextc.is_digit()) {
|
|
num := s.ident_number()
|
|
return scan_res(.number, num)
|
|
}
|
|
// Handle `'$fn()'`
|
|
if c == `)` && s.inter_start {
|
|
s.inter_end = true
|
|
s.inter_start = false
|
|
next_char := if s.pos + 1 < s.text.len { s.text[s.pos + 1] } else { `\0` }
|
|
if next_char == s.quote {
|
|
s.inside_string = false
|
|
}
|
|
return scan_res(.rpar, '')
|
|
}
|
|
// all other tokens
|
|
match c {
|
|
`+` {
|
|
if nextc == `+` {
|
|
s.pos++
|
|
return scan_res(.inc, '')
|
|
}
|
|
else if nextc == `=` {
|
|
s.pos++
|
|
return scan_res(.plus_assign, '')
|
|
}
|
|
return scan_res(.plus, '')
|
|
}
|
|
`-` {
|
|
if nextc == `-` {
|
|
s.pos++
|
|
return scan_res(.dec, '')
|
|
}
|
|
else if nextc == `=` {
|
|
s.pos++
|
|
return scan_res(.minus_assign, '')
|
|
}
|
|
return scan_res(.minus, '')
|
|
}
|
|
`*` {
|
|
if nextc == `=` {
|
|
s.pos++
|
|
return scan_res(.mult_assign, '')
|
|
}
|
|
return scan_res(.mul, '')
|
|
}
|
|
`^` {
|
|
if nextc == `=` {
|
|
s.pos++
|
|
return scan_res(.xor_assign, '')
|
|
}
|
|
return scan_res(.xor, '')
|
|
}
|
|
`%` {
|
|
if nextc == `=` {
|
|
s.pos++
|
|
return scan_res(.mod_assign, '')
|
|
}
|
|
return scan_res(.mod, '')
|
|
}
|
|
`?` {
|
|
return scan_res(.question, '')
|
|
}
|
|
single_quote, double_quote {
|
|
return scan_res(.str, s.ident_string())
|
|
}
|
|
`\`` {
|
|
// ` // apostrophe balance comment. do not remove
|
|
return scan_res(.chartoken, s.ident_char())
|
|
}
|
|
`(` {
|
|
return scan_res(.lpar, '')
|
|
}
|
|
`)` {
|
|
return scan_res(.rpar, '')
|
|
}
|
|
`[` {
|
|
return scan_res(.lsbr, '')
|
|
}
|
|
`]` {
|
|
return scan_res(.rsbr, '')
|
|
}
|
|
`{` {
|
|
// Skip { in `${` in strings
|
|
if s.inside_string {
|
|
return s.scan()
|
|
}
|
|
return scan_res(.lcbr, '')
|
|
}
|
|
`$` {
|
|
if s.inside_string {
|
|
return scan_res(.str_dollar, '')
|
|
}
|
|
else {
|
|
return scan_res(.dollar, '')
|
|
}
|
|
}
|
|
`}` {
|
|
// s = `hello $name !`
|
|
// s = `hello ${name} !`
|
|
if s.inside_string {
|
|
s.pos++
|
|
if s.text[s.pos] == s.quote {
|
|
s.inside_string = false
|
|
return scan_res(.str, '')
|
|
}
|
|
return scan_res(.str, s.ident_string())
|
|
}
|
|
else {
|
|
return scan_res(.rcbr, '')
|
|
}
|
|
}
|
|
`&` {
|
|
if nextc == `=` {
|
|
s.pos++
|
|
return scan_res(.and_assign, '')
|
|
}
|
|
if nextc == `&` {
|
|
s.pos++
|
|
return scan_res(.and, '')
|
|
}
|
|
return scan_res(.amp, '')
|
|
}
|
|
`|` {
|
|
if nextc == `|` {
|
|
s.pos++
|
|
return scan_res(.logical_or, '')
|
|
}
|
|
if nextc == `=` {
|
|
s.pos++
|
|
return scan_res(.or_assign, '')
|
|
}
|
|
return scan_res(.pipe, '')
|
|
}
|
|
`,` {
|
|
return scan_res(.comma, '')
|
|
}
|
|
`@` {
|
|
s.pos++
|
|
name := s.ident_name()
|
|
// @FN => will be substituted with the name of the current V function
|
|
// @FILE => will be substituted with the path of the V source file
|
|
// @LINE => will be substituted with the V line number where it appears (as a string).
|
|
// @COLUMN => will be substituted with the column where it appears (as a string).
|
|
// @VHASH => will be substituted with the shortened commit hash of the V compiler (as a string).
|
|
// This allows things like this:
|
|
// println( 'file: ' + @FILE + ' | line: ' + @LINE + ' | fn: ' + @FN)
|
|
// ... which is useful while debugging/tracing
|
|
if name == 'FN' {
|
|
return scan_res(.str, s.fn_name)
|
|
}
|
|
if name == 'FILE' {
|
|
return scan_res(.str, cescaped_path(os.realpath(s.file_path)))
|
|
}
|
|
if name == 'LINE' {
|
|
return scan_res(.str, (s.line_nr + 1).str())
|
|
}
|
|
if name == 'COLUMN' {
|
|
return scan_res(.str, (s.current_column()).str())
|
|
}
|
|
if name == 'VHASH' {
|
|
return scan_res(.str, vhash())
|
|
}
|
|
if !is_key(name) {
|
|
s.error('@ must be used before keywords (e.g. `@type string`)')
|
|
}
|
|
return scan_res(.name, name)
|
|
}
|
|
/*
|
|
case `\r`:
|
|
if nextc == `\n` {
|
|
s.pos++
|
|
s.last_nl_pos = s.pos
|
|
return scan_res(.nl, '')
|
|
}
|
|
}
|
|
case `\n`:
|
|
s.last_nl_pos = s.pos
|
|
return scan_res(.nl, '')
|
|
}
|
|
*/
|
|
|
|
`.` {
|
|
if nextc == `.` {
|
|
s.pos++
|
|
if s.text[s.pos + 1] == `.` {
|
|
s.pos++
|
|
return scan_res(.ellipsis, '')
|
|
}
|
|
return scan_res(.dotdot, '')
|
|
}
|
|
return scan_res(.dot, '')
|
|
}
|
|
`#` {
|
|
start := s.pos + 1
|
|
s.ignore_line()
|
|
if nextc == `!` {
|
|
// treat shebang line (#!) as a comment
|
|
s.line_comment = s.text[start + 1..s.pos].trim_space()
|
|
// s.fgenln('// shebang line "$s.line_comment"')
|
|
return s.scan()
|
|
}
|
|
hash := s.text[start..s.pos]
|
|
return scan_res(.hash, hash.trim_space())
|
|
}
|
|
`>` {
|
|
if nextc == `=` {
|
|
s.pos++
|
|
return scan_res(.ge, '')
|
|
}
|
|
else if nextc == `>` {
|
|
if s.pos + 2 < s.text.len && s.text[s.pos + 2] == `=` {
|
|
s.pos += 2
|
|
return scan_res(.righ_shift_assign, '')
|
|
}
|
|
s.pos++
|
|
return scan_res(.righ_shift, '')
|
|
}
|
|
else {
|
|
return scan_res(.gt, '')
|
|
}
|
|
}
|
|
0xE2 {
|
|
// case `≠`:
|
|
if nextc == 0x89 && s.text[s.pos + 2] == 0xA0 {
|
|
s.pos += 2
|
|
return scan_res(.ne, '')
|
|
}
|
|
// ⩽
|
|
else if nextc == 0x89 && s.text[s.pos + 2] == 0xBD {
|
|
s.pos += 2
|
|
return scan_res(.le, '')
|
|
}
|
|
// ⩾
|
|
else if nextc == 0xA9 && s.text[s.pos + 2] == 0xBE {
|
|
s.pos += 2
|
|
return scan_res(.ge, '')
|
|
}
|
|
}
|
|
`<` {
|
|
if nextc == `=` {
|
|
s.pos++
|
|
return scan_res(.le, '')
|
|
}
|
|
else if nextc == `<` {
|
|
if s.pos + 2 < s.text.len && s.text[s.pos + 2] == `=` {
|
|
s.pos += 2
|
|
return scan_res(.left_shift_assign, '')
|
|
}
|
|
s.pos++
|
|
return scan_res(.left_shift, '')
|
|
}
|
|
else if nextc == `-` {
|
|
s.pos++
|
|
println("GOT ARR")
|
|
return scan_res(.left_arrow, '')
|
|
}
|
|
else {
|
|
return scan_res(.lt, '')
|
|
}
|
|
}
|
|
`=` {
|
|
if nextc == `=` {
|
|
s.pos++
|
|
return scan_res(.eq, '')
|
|
}
|
|
else if nextc == `>` {
|
|
s.pos++
|
|
return scan_res(.arrow, '')
|
|
}
|
|
else {
|
|
return scan_res(.assign, '')
|
|
}
|
|
}
|
|
`:` {
|
|
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()
|
|
if s.is_fmt {
|
|
s.pos-- // fix line_nr, \n was read, and the comment is marked on the next line
|
|
s.line_nr--
|
|
return scan_res(.line_comment, s.line_comment)
|
|
}
|
|
// 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
|
|
comment := s.text[start..end]
|
|
if s.is_fmt {
|
|
s.line_comment = comment
|
|
return scan_res(.mline_comment, s.line_comment)
|
|
}
|
|
// Skip if not in fmt mode
|
|
return s.scan()
|
|
}
|
|
return scan_res(.div, '')
|
|
}
|
|
else {
|
|
}}
|
|
$if windows {
|
|
if c == `\0` {
|
|
return s.end_of_file()
|
|
}
|
|
}
|
|
s.error('invalid character `${c.str()}`')
|
|
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 {
|
|
if s.pos < s.text.len - 1 && s.text[s.pos + 1].is_digit() {
|
|
}
|
|
else {
|
|
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')
|
|
}
|
|
// ${var} (ignore in vfmt mode)
|
|
if c == `{` && prevc == `$` && !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
|
|
}
|
|
// $var
|
|
if is_name_char(c) && prevc == `$` && !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)\n' + 'use quotes for strings, backticks for characters')
|
|
}
|
|
}
|
|
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(filepath.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 == `_` || c.is_letter()
|
|
}
|
|
|
|
[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 > 15 && !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` ')
|
|
}
|
|
}
|