Gitweb links:
...log
http://git.netsurf-browser.org/libcss.git/shortlog/62dc80851eef3e256ef522dd68346672f30b7375
...commit
http://git.netsurf-browser.org/libcss.git/commit/62dc80851eef3e256ef522dd68346672f30b7375
...tree
http://git.netsurf-browser.org/libcss.git/tree/62dc80851eef3e256ef522dd68346672f30b7375
The branch, tlsa/calc has been created
at 62dc80851eef3e256ef522dd68346672f30b7375 (commit)
- Log -----------------------------------------------------------------
commitdiff
http://git.netsurf-browser.org/libcss.git/commit/?id=62dc80851eef3e256ef522dd68346672f30b7375
commit 62dc80851eef3e256ef522dd68346672f30b7375
Author: Daniel Silverstone <[email protected]>
Commit: Michael Drake <Michael Drake [email protected]>
parse: Add calc() parser.
Co-authored-by: Michael Drake <[email protected]>
diff --git a/src/parse/properties/css_property_parser_gen.c
b/src/parse/properties/css_property_parser_gen.c
index 0e6ce72..838f2b6 100644
--- a/src/parse/properties/css_property_parser_gen.c
+++ b/src/parse/properties/css_property_parser_gen.c
@@ -296,6 +296,16 @@ void output_length_unit(FILE *outputf, struct keyval
*parseid, struct keyval_lis
struct keyval *ckv = kvlist->item[0];
int ident_count;
+ fprintf(outputf,
+ "if ((token->type == CSS_TOKEN_IDENT) && "
+ "(lwc_string_caseless_isequal(token->idata, c->strings[CALC],
&match) == lwc_error_ok && match))"
+ " {\n"
+ "\t\terror = css__parse_calc(c, vector, ctx, result,
buildOPV(%s, 0, %s /* _CALC */), %s);\n"
+ "\t} else ",
+ parseid->val,
+ ckv->val,
+ ckv->key
+ );
fprintf(outputf,
"{\n"
diff --git a/src/parse/properties/utils.c b/src/parse/properties/utils.c
index 0e49853..b1864cb 100644
--- a/src/parse/properties/utils.c
+++ b/src/parse/properties/utils.c
@@ -1334,3 +1334,268 @@ cleanup:
return error;
}
+/******************************************************************************/
+
+/* CALC
+ *
+ * calc( <calc-sum> )
+ *
+ * where
+ * <calc-sum> = <calc-product> [ [ '+' | '-' ] <calc-product> ]*
+ *
+ * where
+ * <calc-product> = <calc-value> [ '*' <calc-value> | '/' <number> ]*
+ *
+ * where
+ * <calc-value> = <number> | <dimension> | <percentage> | ( <calc-sum> )
+ *
+ *
+ * calc(10px + (4rem / 2)) =>
+ * U 10 px
+ * U 4 rem
+ * N 2
+ * /
+ * +
+ * =
+ */
+
+static css_error
+css__parse_calc_sum(css_language *c,
+ const parserutils_vector *vector, int *ctx,
+ css_style *result,
+ uint32_t unit);
+
+static css_error
+css__parse_calc_value(css_language *c,
+ const parserutils_vector *vector, int *ctx,
+ css_style *result,
+ uint32_t default_unit)
+{
+ css_error error;
+ int orig_ctx = *ctx;
+ const css_token *token;
+
+ token = parserutils_vector_iterate(vector, ctx);
+ if (tokenIsChar(token, '(')) {
+ error = css__parse_calc_sum(c, vector, ctx, result,
default_unit);
+ if (error != CSS_OK) {
+ return error;
+ }
+
+ token = parserutils_vector_peek(vector, *ctx);
+ if (!tokenIsChar(token, ')')) {
+ return CSS_INVALID;
+ }
+
+ } else switch (token->type) {
+ case CSS_TOKEN_NUMBER: /* Fall through */
+ case CSS_TOKEN_DIMENSION: /* Fall through */
+ case CSS_TOKEN_PERCENTAGE:
+ {
+ css_fixed length = 0;
+ uint32_t unit = 0;
+ *ctx = orig_ctx;
+
+ error = css__parse_unit_specifier(c, vector, ctx, default_unit,
&length, &unit);
+ if (error != CSS_OK) {
+ *ctx = orig_ctx;
+ return error;
+ }
+
+ error = css__stylesheet_style_vappend(result, 3, (css_code_t)
'U', length, unit);
+ }
+ break;
+
+ default:
+ error = CSS_INVALID;
+ break;
+ }
+
+ return error;
+}
+
+/* Both this, and css_parse_calc_sum must stop when it encounters a
close-paren.
+ * If it hasn't had any useful tokens before that, it's an error. It does not
+ * need to restore ctx before returning an error but it does need to ensure
that
+ * the close paren has not been consumed
+ */
+static css_error
+css__parse_calc_product(css_language *c,
+ const parserutils_vector *vector, int *ctx,
+ css_style *result,
+ uint32_t unit)
+{
+ css_error error = CSS_OK;
+ const css_token *token;
+ bool multiplication;
+
+
+ /* First parse a value */
+ error = css__parse_calc_value(c, vector, ctx, result, unit);
+ if (error != CSS_OK) {
+ return error;
+ }
+
+ do {
+ /* What is our next token? */
+ token = parserutils_vector_peek(vector, *ctx);
+ if (token == NULL) {
+ error = CSS_INVALID;
+ break;
+ } else if (tokenIsChar(token, ')'))
+ break;
+ else if (tokenIsChar(token, '*'))
+ multiplication = true;
+ else if (tokenIsChar(token, '/'))
+ multiplication = false;
+ else {
+ error = CSS_INVALID;
+ break;
+ }
+ /* Consume that * or / now */
+ token = parserutils_vector_iterate(vector, ctx);
+
+ if (multiplication) {
+ /* parse another value */
+ error = css__parse_calc_value(c, vector, ctx, result,
unit);
+ if (error != CSS_OK)
+ break;
+ } else {
+ css_fixed num;
+ size_t consumed;
+
+ token = parserutils_vector_iterate(vector, ctx);
+ if (token->type != CSS_TOKEN_NUMBER) {
+ error = CSS_INVALID;
+ break;
+ }
+ num = css__number_from_lwc_string(token->idata, false,
&consumed);
+ if (consumed != lwc_string_length(token->idata)) {
+ error = CSS_INVALID;
+ break;
+ }
+
+ error = css__stylesheet_style_append(result,
(css_code_t) 'N');
+ if (error != CSS_OK)
+ break;
+ error = css__stylesheet_style_append(result,
(css_code_t) num);
+ if (error != CSS_OK)
+ break;
+ }
+
+ /* emit the multiplication/division operator */
+ error = css__stylesheet_style_append(result, (css_code_t)
(multiplication ? '*' : '/'));
+ } while (1);
+ /* We've fallen off, either we had an error or we're left with ')' */
+ return error;
+}
+
+
+css_error
+css__parse_calc_sum(css_language *c,
+ const parserutils_vector *vector, int *ctx,
+ css_style *result,
+ uint32_t unit)
+{
+ css_error error = CSS_OK;
+ const css_token *token;
+ bool addition;
+
+
+ /* First parse a product */
+ error = css__parse_calc_product(c, vector, ctx, result, unit);
+ if (error != CSS_OK) {
+ return error;
+ }
+
+ do {
+ /* What is our next token? */
+ token = parserutils_vector_peek(vector, *ctx);
+ if (token == NULL) {
+ error = CSS_INVALID;
+ break;
+ } else if (tokenIsChar(token, ')'))
+ break;
+ else if (tokenIsChar(token, '+'))
+ addition = true;
+ else if (tokenIsChar(token, '-'))
+ addition = false;
+ else {
+ error = CSS_INVALID;
+ break;
+ }
+ /* Consume that + or - now */
+ token = parserutils_vector_iterate(vector, ctx);
+
+ /* parse another product */
+ error = css__parse_calc_product(c, vector, ctx, result, unit);
+ if (error != CSS_OK)
+ break;
+
+ /* emit the addition/subtraction operator */
+ error = css__stylesheet_style_append(result, (css_code_t)
(addition ? '+' : '-'));
+ } while (1);
+ /* We've fallen off, either we had an error or we're left with ')' */
+ return error;
+}
+
+/* Documented in utils.h */
+css_error css__parse_calc(css_language *c,
+ const parserutils_vector *vector, int *ctx,
+ css_style *result,
+ css_code_t property,
+ uint32_t unit)
+{
+ int orig_ctx = *ctx;
+ const css_token *token;
+ css_error error = CSS_OK;
+ css_style *calc_style = NULL;
+
+ token = parserutils_vector_iterate(vector, ctx);
+ if (token == NULL) {
+ *ctx = orig_ctx;
+ return CSS_INVALID;
+ }
+
+ if (!tokenIsChar(token, '(')) {
+ /* If we don't get an open-paren, give up now */
+ *ctx = orig_ctx;
+ return CSS_INVALID;
+ }
+
+ error = css__stylesheet_style_create(c->sheet, &calc_style);
+ if (error != CSS_OK)
+ goto cleanup;
+
+ error = css__stylesheet_style_append(calc_style, property);
+ if (error != CSS_OK)
+ goto cleanup;
+
+ error = css__parse_calc_sum(c, vector, ctx, calc_style, unit);
+ if (error != CSS_OK)
+ goto cleanup;
+
+ token = parserutils_vector_iterate(vector, ctx);
+ if (!tokenIsChar(token, ')')) {
+ /* If we don't get a close-paren, give up now */
+ error = CSS_INVALID;
+ goto cleanup;
+ }
+
+ /* Append the indicator that the calc is finished */
+ error = css__stylesheet_style_append(calc_style, (css_code_t) '=');
+ if (error != CSS_OK)
+ goto cleanup;
+
+ /* TODO: Once we're OK to do so, merge the style */
+ (void)result;
+ /* error = css__stylesheet_style_merge_style(result, calc_style); */
+
+cleanup:
+ css__stylesheet_style_destroy(calc_style);
+ if (error != CSS_OK) {
+ *ctx = orig_ctx;
+ }
+
+ return error;
+}
\ No newline at end of file
diff --git a/src/parse/properties/utils.h b/src/parse/properties/utils.h
index e4c97c7..e5331d2 100644
--- a/src/parse/properties/utils.h
+++ b/src/parse/properties/utils.h
@@ -199,4 +199,28 @@ css_error css__comma_list_to_style(css_language *c,
bool first),
css_style *result);
+/**
+ * Parse a CSS calc() invocation
+ *
+ * Calc can generate a number of kinds of units, so we have to tell the
+ * parser the kind of unit we're aiming for (e.g. UNIT_PX, UNIT_ANGLE, etc.)
+ *
+ * \param[in] c Parsing context
+ * \param[in] vector Vector of tokens to process
+ * \param[in] ctx Pointer to vector iteration context
+ * \param[in] result Pointer to location to receive resulting style
+ * \param[in] property The CSS property we are calculating for
+ * \param[in] unit The kind of unit which we want to come out of this
calc()
+ * \return CSS_OK on success,
+ * CSS_NOMEM on memory exhaustion,
+ CSS_INVALID if the input is not valid
+ *
+ * Post condition: \a *ctx is updated with the next token to process
+ * If the input is invalid, then \a *ctx remains unchanged.
+ */
+css_error css__parse_calc(css_language *c,
+ const parserutils_vector *vector, int *ctx,
+ css_style *result,
+ css_code_t property,
+ uint32_t unit);
#endif
diff --git a/src/parse/propstrings.c b/src/parse/propstrings.c
index 3c9401b..0156ea4 100644
--- a/src/parse/propstrings.c
+++ b/src/parse/propstrings.c
@@ -443,6 +443,7 @@ const stringmap_entry stringmap[LAST_KNOWN] = {
{ "or", SLEN("or") },
{ "only", SLEN("only") },
{ "infinite", SLEN("infinite") },
+ { "calc", SLEN("calc") },
{ "aliceblue", SLEN("aliceblue") },
{ "antiquewhite", SLEN("antiquewhite") },
diff --git a/src/parse/propstrings.h b/src/parse/propstrings.h
index 24b681b..c5dd113 100644
--- a/src/parse/propstrings.h
+++ b/src/parse/propstrings.h
@@ -101,7 +101,7 @@ enum {
AVOID_PAGE, AVOID_COLUMN, BALANCE, HORIZONTAL_TB, VERTICAL_RL,
VERTICAL_LR, CONTENT_BOX, BORDER_BOX, STRETCH, INLINE_FLEX, FLEX_START,
FLEX_END, SPACE_BETWEEN, SPACE_AROUND, SPACE_EVENLY, ROW, ROW_REVERSE,
- COLUMN_REVERSE, WRAP_STRING, WRAP_REVERSE, AND, OR, ONLY, INFINITE,
+ COLUMN_REVERSE, WRAP_STRING, WRAP_REVERSE, AND, OR, ONLY, INFINITE,
CALC,
/* Named colours */
FIRST_COLOUR,
-----------------------------------------------------------------------
--
Cascading Style Sheets library
_______________________________________________
netsurf-commits mailing list -- [email protected]
To unsubscribe send an email to [email protected]
