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explication de la methode de parsing

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hugogogo
2021-10-15 10:39:47 +02:00
parent 3e758dc843
commit 7e53601ad5
1 changed files with 25 additions and 11 deletions
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README.md
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@@ -10,10 +10,10 @@
- **expensions :**
- `$` *variable expension*
- `$?` *exit return of last executed process*
- **quotes :** --> [ressource](https://linuxhandbook.com/quotes-in-bash/)
- **quotes :** [ressource](https://linuxhandbook.com/quotes-in-bash/)
- `'` *(ignore any special characters)*
- `"` *(ignore any special characters except '$')*
- **redirections & heredocs :** --> [ressource](https://www.gnu.org/software/bash/manual/html_node/Redirections.html) / [heredocs for readability](https://www.techrepublic.com/article/use-heredoc-in-shell-scripts/)
- **redirections & heredocs :** [ressource](https://www.gnu.org/software/bash/manual/html_node/Redirections.html) / [heredocs for readability](https://www.techrepublic.com/article/use-heredoc-in-shell-scripts/)
- `<` *redirect input*
- `>` *redirect output*
- `<<` *read input until empty line --* **? doesn't update history ?**
@@ -29,12 +29,11 @@
- `export`
- `unset`
- ~~`exit`~~
- **builtins (don't need to be) :**
- **builtins (don't need to be) :** [source](https://git.42l.fr/Fabien/minishell)
- `env`
- ~~`echo`~~
- `echo -n`
--> [source of a minishell with an interesting README](https://git.42l.fr/Fabien/minishell)
---
@@ -88,6 +87,8 @@ EXEMPLE : . .
- 'a"r'g'"1'
- 'arg"1"'arg2'arg3'
### tentative methode 1
#### pseudo code :
```
int q; // first quote
int c; // count
@@ -136,8 +137,9 @@ while (str[i])
}
i++;
}
```
### application :
```
['][a][r][g][1][ ]['][a][r][g][2]["][ ][a][r][g][3]["]
c = 0 . . . . . . . . . . . . . . . . . .
c = 1 . . . . . . . . . . . . . . . . . str[i] == ' ; q == 0 c == 0 -> c++; q = '
@@ -175,14 +177,16 @@ c = . . . . . . . 1 . . str[i] == " ; q != " c == 2 ->
ERROR ...
c = . . . . . . . . 1 . str[i] != ' | " ; ->
c = . . . . . . . . . 0 str[i] != ' | " ; ->
```
#### erreur :
-> comment le programme sait que cette fois il doit decrementer "c" ?
en retenant dans l'ordre toutes les dernieres valeurs de "q" !
-> donc plutot partir sur une recursive
```
deuxieme methode :
### tentative methode 2 :
#### exemple :
```
.--------------------------------------------.
: .--------------------------------------. :
@@ -191,15 +195,25 @@ deuxieme methode :
: : : .--. : .--. : : .--. : : : :
'__"__'__"__"__"__'__'__"__"__'__'__"__'__"__'
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16
piege :
```
-> repérer les paires de quotes ou dquotes
-> piège :
```
| |
.--. .--. v v .--.
'__"__'__"__"__"__'__'__"__"__'__'__"__'__"__'
00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15
```
0. envoyer une copie de la str dans une fonction
1. chercher la premiere pair
2. l'effacer
3. recommencer en boucle
4. stop quand la premier quote a trouvé sa paire
5. renvoyer l'emplacement de la pair
exemple :
```
.--.
1 : '__"__'__"__"__"__'__'__"__"__'__'__"__'__"__'