mirror of
https://github.com/janet-lang/janet
synced 2024-12-26 00:10:27 +00:00
Add buffer/format as well as string/format.
buffer/format uses the old string/format behavior. `string/format` no longer requires a buffer, and returns a string.
This commit is contained in:
Calvin Rose
parent
00020ba8ab
commit
029394db31
@ -317,6 +317,14 @@ static Janet cfun_buffer_blit(int32_t argc, Janet *argv) {
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return argv[0];
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}
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static Janet cfun_buffer_format(int32_t argc, Janet *argv) {
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janet_arity(argc, 2, -1);
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JanetBuffer *buffer = janet_getbuffer(argv, 0);
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const char *strfrmt = (const char *) janet_getstring(argv, 1);
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janet_buffer_format(buffer, strfrmt, 1, argc, argv);
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return argv[0];
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}
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static const JanetReg buffer_cfuns[] = {
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{"buffer/new", cfun_buffer_new,
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JDOC("(buffer/new capacity)\n\n"
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@ -383,6 +391,11 @@ static const JanetReg buffer_cfuns[] = {
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"indicate which part of src to copy into which part of dest. Indices can be "
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"negative to index from the end of src or dest. Returns dest.")
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},
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{"buffer/format", cfun_buffer_format,
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JDOC("(buffer/format buffer format & args)\n\n"
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"Snprintf like functionality for printing values into a buffer. Returns "
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" the modified buffer.")
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},
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{NULL, NULL, NULL}
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};
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146
src/core/pp.c
146
src/core/pp.c
@ -20,6 +20,9 @@
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* IN THE SOFTWARE.
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*/
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#include <string.h>
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#include <ctype.h>
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#ifndef JANET_AMALG
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#include <janet/janet.h>
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#include "util.h"
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@ -549,3 +552,146 @@ const uint8_t *janet_formatc(const char *format, ...) {
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return ret;
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}
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/*
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* code adapted from lua/lstrlib.c http://lua.org
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*/
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#define MAX_ITEM 256
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#define FMT_FLAGS "-+ #0"
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#define MAX_FORMAT 32
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static const char *scanformat(
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const char *strfrmt,
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char *form,
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char width[3],
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char precision[3]) {
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const char *p = strfrmt;
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memset(width, '\0', 3);
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memset(precision, '\0', 3);
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while (*p != '\0' && strchr(FMT_FLAGS, *p) != NULL)
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p++; /* skip flags */
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if ((size_t) (p - strfrmt) >= sizeof(FMT_FLAGS) / sizeof(char))
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janet_panic("invalid format (repeated flags)");
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if (isdigit((int) (*p)))
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width[0] = *p++; /* skip width */
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if (isdigit((int) (*p)))
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width[1] = *p++; /* (2 digits at most) */
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if (*p == '.') {
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p++;
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if (isdigit((int) (*p)))
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precision[0] = *p++; /* skip precision */
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if (isdigit((int) (*p)))
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precision[1] = *p++; /* (2 digits at most) */
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}
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if (isdigit((int) (*p)))
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janet_panic("invalid format (width or precision too long)");
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*(form++) = '%';
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memcpy(form, strfrmt, ((p - strfrmt) + 1) * sizeof(char));
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form += (p - strfrmt) + 1;
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*form = '\0';
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return p;
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}
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/* Shared implementation between string/format and
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* buffer/format */
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void janet_buffer_format(
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JanetBuffer *b,
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const char *strfrmt,
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int32_t argstart,
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int32_t argc,
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Janet *argv) {
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size_t sfl = strlen(strfrmt);
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const char *strfrmt_end = strfrmt + sfl;
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int32_t arg = argstart;
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while (strfrmt < strfrmt_end) {
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if (*strfrmt != '%')
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janet_buffer_push_u8(b, (uint8_t) * strfrmt++);
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else if (*++strfrmt == '%')
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janet_buffer_push_u8(b, (uint8_t) * strfrmt++); /* %% */
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else { /* format item */
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char form[MAX_FORMAT], item[MAX_ITEM];
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char width[3], precision[3];
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int nb = 0; /* number of bytes in added item */
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if (++arg >= argc)
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janet_panic("not enough values for format");
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strfrmt = scanformat(strfrmt, form, width, precision);
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switch (*strfrmt++) {
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case 'c':
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{
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nb = snprintf(item, MAX_ITEM, form, (int)
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janet_getinteger(argv, arg));
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break;
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}
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case 'd':
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case 'i':
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case 'o':
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case 'u':
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case 'x':
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case 'X':
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{
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int32_t n = janet_getinteger(argv, arg);
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nb = snprintf(item, MAX_ITEM, form, n);
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break;
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}
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case 'a':
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case 'A':
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case 'e':
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case 'E':
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case 'f':
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case 'g':
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case 'G':
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{
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double d = janet_getnumber(argv, arg);
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nb = snprintf(item, MAX_ITEM, form, d);
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break;
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}
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case 's':
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{
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const uint8_t *s = janet_getstring(argv, arg);
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size_t l = janet_string_length(s);
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if (form[2] == '\0')
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janet_buffer_push_bytes(b, s, l);
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else {
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if (l != strlen((const char *) s))
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janet_panic("string contains zeros");
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if (!strchr(form, '.') && l >= 100) {
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janet_panic
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("no precision and string is too long to be formatted");
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} else {
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nb = snprintf(item, MAX_ITEM, form, s);
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}
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}
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break;
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}
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case 'V':
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{
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janet_to_string_b(b, argv[arg]);
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break;
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}
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case 'v':
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{
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janet_description_b(b, argv[arg]);
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break;
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}
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case 'p': /* janet pretty , precision = depth */
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{
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int depth = atoi(precision);
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if (depth < 1)
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depth = 4;
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janet_pretty(b, depth, argv[arg]);
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break;
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}
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default:
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{ /* also treat cases 'nLlh' */
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janet_panicf("invalid conversion '%s' to 'format'",
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form);
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}
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}
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if (nb >= MAX_ITEM)
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janet_panicf("format buffer overflow", form);
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if (nb > 0)
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janet_buffer_push_bytes(b, (uint8_t *) item, nb);
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}
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}
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}
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@ -21,7 +21,6 @@
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*/
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#include <string.h>
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#include <ctype.h>
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#ifndef JANET_AMALG
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#include <janet/janet.h>
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@ -502,144 +501,12 @@ static Janet cfun_string_pretty(int32_t argc, Janet *argv) {
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return janet_wrap_buffer(buffer);
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}
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/*
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* code adapted from lua/lstrlib.c http://lua.org
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*/
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#define MAX_ITEM 256
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#define FMT_FLAGS "-+ #0"
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#define MAX_FORMAT 32
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static const char *scanformat(
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const char *strfrmt,
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char *form,
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char width[3],
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char precision[3]) {
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const char *p = strfrmt;
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memset(width, '\0', 3);
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memset(precision, '\0', 3);
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while (*p != '\0' && strchr(FMT_FLAGS, *p) != NULL)
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p++; /* skip flags */
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if ((size_t) (p - strfrmt) >= sizeof(FMT_FLAGS) / sizeof(char))
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janet_panic("invalid format (repeated flags)");
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if (isdigit((int) (*p)))
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width[0] = *p++; /* skip width */
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if (isdigit((int) (*p)))
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width[1] = *p++; /* (2 digits at most) */
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if (*p == '.') {
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p++;
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if (isdigit((int) (*p)))
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precision[0] = *p++; /* skip precision */
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if (isdigit((int) (*p)))
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precision[1] = *p++; /* (2 digits at most) */
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}
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if (isdigit((int) (*p)))
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janet_panic("invalid format (width or precision too long)");
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*(form++) = '%';
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memcpy(form, strfrmt, ((p - strfrmt) + 1) * sizeof(char));
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form += (p - strfrmt) + 1;
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*form = '\0';
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return p;
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}
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static Janet cfun_string_format(int32_t argc, Janet *argv) {
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janet_arity(argc, 2, -1);
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JanetBuffer *b = janet_getbuffer(argv, 0);
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const char *strfrmt = (const char *) janet_getstring(argv, 1);
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size_t sfl = strlen(strfrmt);
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const char *strfrmt_end = strfrmt + sfl;
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int32_t arg = 1;
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while (strfrmt < strfrmt_end) {
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if (*strfrmt != '%')
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janet_buffer_push_u8(b, (uint8_t) * strfrmt++);
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else if (*++strfrmt == '%')
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janet_buffer_push_u8(b, (uint8_t) * strfrmt++); /* %% */
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else { /* format item */
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char form[MAX_FORMAT],item[MAX_ITEM];
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char width[3], precision[3];
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int nb = 0; /* number of bytes in added item */
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if (++arg >= argc)
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janet_panic("not enough values for format");
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strfrmt = scanformat(strfrmt, form, width, precision);
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switch (*strfrmt++) {
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case 'c':
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{
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nb = snprintf(item, MAX_ITEM, form, (int)
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janet_getinteger(argv, arg));
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break;
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}
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case 'd':
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case 'i':
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case 'o':
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case 'u':
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case 'x':
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case 'X':
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{
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int32_t n = janet_getinteger(argv, arg);
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nb = snprintf(item, MAX_ITEM, form, n);
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break;
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}
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case 'a':
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case 'A':
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case 'e':
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case 'E':
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case 'f':
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case 'g':
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case 'G':
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{
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double d = janet_getnumber(argv, arg);
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nb = snprintf(item, MAX_ITEM, form, d);
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break;
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}
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case 's':
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{
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const uint8_t *s = janet_getstring(argv, arg);
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size_t l = janet_string_length(s);
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if (form[2] == '\0')
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janet_buffer_push_bytes(b, s, l);
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else {
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if (l != strlen((const char *) s))
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janet_panic("string contains zeros");
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if (!strchr(form, '.') && l >= 100) {
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janet_panic
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("no precision and string is too long to be formatted");
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} else {
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nb = snprintf(item, MAX_ITEM, form, s);
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}
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}
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break;
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}
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case 'V':
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{
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janet_to_string_b(b, argv[arg]);
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break;
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}
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case 'v':
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{
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janet_description_b(b, argv[arg]);
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break;
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}
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case 'p': /* janet pretty , precision = depth */
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{
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int depth = atoi(precision);
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if (depth < 1)
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depth = 4;
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janet_pretty(b, depth, argv[arg]);
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break;
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}
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default:
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{ /* also treat cases 'nLlh' */
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janet_panicf("invalid conversion '%s' to 'format'",
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form);
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}
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}
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if (nb >= MAX_ITEM)
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janet_panicf("format buffer overflow", form);
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if (nb > 0)
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janet_buffer_push_bytes(b, (uint8_t *) item, nb);
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}
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}
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return janet_wrap_buffer(b);
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janet_arity(argc, 1, -1);
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JanetBuffer *buffer = janet_buffer(0);
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const char *strfrmt = (const char *) janet_getstring(argv, 0);
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janet_buffer_format(buffer, strfrmt, 0, argc, argv);
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return janet_stringv(buffer->data, buffer->count);
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}
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static const JanetReg string_cfuns[] = {
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@ -52,6 +52,12 @@ const void *janet_strbinsearch(
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size_t tabcount,
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size_t itemsize,
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const uint8_t *key);
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void janet_buffer_format(
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JanetBuffer *b,
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const char *strfrmt,
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int32_t argstart,
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int32_t argc,
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Janet *argv);
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/* Inside the janet core, defining globals is different
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* at bootstrap time and normal runtime */
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@ -20,15 +20,23 @@
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(import test/helper :prefix "" :exit true)
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(start-suite 4)
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# some tests for string/format
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# some tests for string/format and buffer/format
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(assert (= (string (string/format @"" "pi = %6.3f" math/pi)) "pi = 3.142") "%6.3f")
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(assert (= (string (string/format @"" "pi = %+6.3f" math/pi)) "pi = +3.142") "%6.3f")
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(assert (= (string (string/format @"" "pi = %40.20g" math/pi)) "pi = 3.141592653589793116") "%6.3f")
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(assert (= (string (buffer/format @"" "pi = %6.3f" math/pi)) "pi = 3.142") "%6.3f")
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(assert (= (string (buffer/format @"" "pi = %+6.3f" math/pi)) "pi = +3.142") "%6.3f")
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(assert (= (string (buffer/format @"" "pi = %40.20g" math/pi)) "pi = 3.141592653589793116") "%6.3f")
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(assert (= (string (string/format @"" "🐼 = %6.3f" math/pi)) "🐼 = 3.142") "UTF-8")
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(assert (= (string (string/format @"" "π = %.8g" math/pi)) "π = 3.1415927") "π")
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(assert (= (string (string/format @"" "\xCF\x80 = %.8g" math/pi)) "\xCF\x80 = 3.1415927") "\xCF\x80")
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(assert (= (string (buffer/format @"" "🐼 = %6.3f" math/pi)) "🐼 = 3.142") "UTF-8")
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(assert (= (string (buffer/format @"" "π = %.8g" math/pi)) "π = 3.1415927") "π")
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(assert (= (string (buffer/format @"" "\xCF\x80 = %.8g" math/pi)) "\xCF\x80 = 3.1415927") "\xCF\x80")
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(assert (= (string/format "pi = %6.3f" math/pi) "pi = 3.142") "%6.3f")
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(assert (= (string/format "pi = %+6.3f" math/pi) "pi = +3.142") "%6.3f")
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(assert (= (string/format "pi = %40.20g" math/pi) "pi = 3.141592653589793116") "%6.3f")
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(assert (= (string/format "🐼 = %6.3f" math/pi) "🐼 = 3.142") "UTF-8")
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(assert (= (string/format "π = %.8g" math/pi) "π = 3.1415927") "π")
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(assert (= (string/format "\xCF\x80 = %.8g" math/pi) "\xCF\x80 = 3.1415927") "\xCF\x80")
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(end-suite)
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